sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1 | |
| 2 | /*--------------------------------------------------------------------*/ |
njn | c1b0181 | 2005-06-17 22:19:06 +0000 | [diff] [blame] | 3 | /*--- Handle system calls. syswrap-main.c ---*/ |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 4 | /*--------------------------------------------------------------------*/ |
| 5 | |
| 6 | /* |
| 7 | This file is part of Valgrind, a dynamic binary instrumentation |
| 8 | framework. |
| 9 | |
sewardj | 0f157dd | 2013-10-18 14:27:36 +0000 | [diff] [blame] | 10 | Copyright (C) 2000-2013 Julian Seward |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 11 | jseward@acm.org |
| 12 | |
| 13 | This program is free software; you can redistribute it and/or |
| 14 | modify it under the terms of the GNU General Public License as |
| 15 | published by the Free Software Foundation; either version 2 of the |
| 16 | License, or (at your option) any later version. |
| 17 | |
| 18 | This program is distributed in the hope that it will be useful, but |
| 19 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 20 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 21 | General Public License for more details. |
| 22 | |
| 23 | You should have received a copy of the GNU General Public License |
| 24 | along with this program; if not, write to the Free Software |
| 25 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 26 | 02111-1307, USA. |
| 27 | |
| 28 | The GNU General Public License is contained in the file COPYING. |
| 29 | */ |
| 30 | |
| 31 | #include "libvex_guest_offsets.h" |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 32 | #include "libvex_trc_values.h" |
njn | c7561b9 | 2005-06-19 01:24:32 +0000 | [diff] [blame] | 33 | #include "pub_core_basics.h" |
sewardj | 2547532 | 2008-10-27 01:23:04 +0000 | [diff] [blame] | 34 | #include "pub_core_aspacemgr.h" |
sewardj | 4cfea4f | 2006-10-14 19:26:10 +0000 | [diff] [blame] | 35 | #include "pub_core_vki.h" |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 36 | #include "pub_core_vkiscnums.h" |
sewardj | 6c591e1 | 2011-04-11 16:17:51 +0000 | [diff] [blame] | 37 | #include "pub_core_libcsetjmp.h" // to keep _threadstate.h happy |
njn | c7561b9 | 2005-06-19 01:24:32 +0000 | [diff] [blame] | 38 | #include "pub_core_threadstate.h" |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 39 | #include "pub_core_libcbase.h" |
| 40 | #include "pub_core_libcassert.h" |
| 41 | #include "pub_core_libcprint.h" |
njn | f4c5016 | 2005-06-20 14:18:12 +0000 | [diff] [blame] | 42 | #include "pub_core_libcproc.h" // For VG_(getpid)() |
njn | de62cbf | 2005-06-10 22:08:14 +0000 | [diff] [blame] | 43 | #include "pub_core_libcsignal.h" |
sewardj | ad0a3a8 | 2006-12-17 18:58:55 +0000 | [diff] [blame] | 44 | #include "pub_core_scheduler.h" // For VG_({acquire,release}_BigLock), |
njn | f4c5016 | 2005-06-20 14:18:12 +0000 | [diff] [blame] | 45 | // and VG_(vg_yield) |
| 46 | #include "pub_core_stacktrace.h" // For VG_(get_and_pp_StackTrace)() |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 47 | #include "pub_core_tooliface.h" |
| 48 | #include "pub_core_options.h" |
njn | 351d006 | 2005-06-21 22:23:59 +0000 | [diff] [blame] | 49 | #include "pub_core_signals.h" // For VG_SIGVGKILL, VG_(poll_signals) |
njn | 9abd608 | 2005-06-17 21:31:45 +0000 | [diff] [blame] | 50 | #include "pub_core_syscall.h" |
sewardj | 2547532 | 2008-10-27 01:23:04 +0000 | [diff] [blame] | 51 | #include "pub_core_machine.h" |
njn | c1b0181 | 2005-06-17 22:19:06 +0000 | [diff] [blame] | 52 | #include "pub_core_syswrap.h" |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 53 | |
| 54 | #include "priv_types_n_macros.h" |
njn | c1b0181 | 2005-06-17 22:19:06 +0000 | [diff] [blame] | 55 | #include "priv_syswrap-main.h" |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 56 | |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 57 | #if defined(VGO_darwin) |
| 58 | #include "priv_syswrap-darwin.h" |
| 59 | #endif |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 60 | |
sewardj | e7aa4ae | 2005-06-09 12:43:42 +0000 | [diff] [blame] | 61 | /* Useful info which needs to be recorded somewhere: |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 62 | Use of registers in syscalls is: |
sewardj | e7aa4ae | 2005-06-09 12:43:42 +0000 | [diff] [blame] | 63 | |
sewardj | b5b8740 | 2011-03-07 16:05:35 +0000 | [diff] [blame] | 64 | NUM ARG1 ARG2 ARG3 ARG4 ARG5 ARG6 ARG7 ARG8 RESULT |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 65 | LINUX: |
sewardj | b5b8740 | 2011-03-07 16:05:35 +0000 | [diff] [blame] | 66 | x86 eax ebx ecx edx esi edi ebp n/a n/a eax (== NUM) |
| 67 | amd64 rax rdi rsi rdx r10 r8 r9 n/a n/a rax (== NUM) |
| 68 | ppc32 r0 r3 r4 r5 r6 r7 r8 n/a n/a r3+CR0.SO (== ARG1) |
| 69 | ppc64 r0 r3 r4 r5 r6 r7 r8 n/a n/a r3+CR0.SO (== ARG1) |
| 70 | arm r7 r0 r1 r2 r3 r4 r5 n/a n/a r0 (== ARG1) |
petarj | 4df0bfc | 2013-02-27 23:17:33 +0000 | [diff] [blame] | 71 | mips32 v0 a0 a1 a2 a3 stack stack n/a n/a v0 (== NUM) |
| 72 | mips64 v0 a0 a1 a2 a3 a4 a5 a6 a7 v0 (== NUM) |
sewardj | f0c1250 | 2014-01-12 12:54:00 +0000 | [diff] [blame] | 73 | arm64 x8 x0 x1 x2 x3 x4 x5 n/a n/a x0 ?? (== ARG1??) |
sewardj | 6e9de46 | 2011-06-28 07:25:29 +0000 | [diff] [blame] | 74 | |
sewardj | b5b8740 | 2011-03-07 16:05:35 +0000 | [diff] [blame] | 75 | On s390x the svc instruction is used for system calls. The system call |
| 76 | number is encoded in the instruction (8 bit immediate field). Since Linux |
| 77 | 2.6 it is also allowed to use svc 0 with the system call number in r1. |
| 78 | This was introduced for system calls >255, but works for all. It is |
| 79 | also possible to see the svc 0 together with an EXecute instruction, that |
| 80 | fills in the immediate field. |
| 81 | s390x r1/SVC r2 r3 r4 r5 r6 r7 n/a n/a r2 (== ARG1) |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 82 | |
| 83 | DARWIN: |
| 84 | x86 eax +4 +8 +12 +16 +20 +24 +28 +32 edx:eax, eflags.c |
| 85 | amd64 rax rdi rsi rdx rcx r8 r9 +8 +16 rdx:rax, rflags.c |
| 86 | |
| 87 | For x86-darwin, "+N" denotes "in memory at N(%esp)"; ditto |
| 88 | amd64-darwin. Apparently 0(%esp) is some kind of return address |
| 89 | (perhaps for syscalls done with "sysenter"?) I don't think it is |
| 90 | relevant for syscalls done with "int $0x80/1/2". |
sewardj | e7aa4ae | 2005-06-09 12:43:42 +0000 | [diff] [blame] | 91 | */ |
| 92 | |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 93 | /* This is the top level of the system-call handler module. All |
| 94 | system calls are channelled through here, doing two things: |
| 95 | |
| 96 | * notify the tool of the events (mem/reg reads, writes) happening |
| 97 | |
| 98 | * perform the syscall, usually by passing it along to the kernel |
| 99 | unmodified. |
| 100 | |
| 101 | A magical piece of assembly code, do_syscall_for_client_WRK, in |
| 102 | syscall-$PLATFORM.S does the tricky bit of passing a syscall to the |
| 103 | kernel, whilst having the simulator retain control. |
| 104 | */ |
| 105 | |
| 106 | /* The main function is VG_(client_syscall). The simulation calls it |
| 107 | whenever a client thread wants to do a syscall. The following is a |
| 108 | sketch of what it does. |
| 109 | |
sewardj | 2547532 | 2008-10-27 01:23:04 +0000 | [diff] [blame] | 110 | * Ensures the root thread's stack is suitably mapped. Tedious and |
| 111 | arcane. See big big comment in VG_(client_syscall). |
| 112 | |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 113 | * First, it rounds up the syscall number and args (which is a |
| 114 | platform dependent activity) and puts them in a struct ("args") |
| 115 | and also a copy in "orig_args". |
| 116 | |
| 117 | The pre/post wrappers refer to these structs and so no longer |
| 118 | need magic macros to access any specific registers. This struct |
| 119 | is stored in thread-specific storage. |
| 120 | |
| 121 | |
| 122 | * The pre-wrapper is called, passing it a pointer to struct |
| 123 | "args". |
| 124 | |
| 125 | |
| 126 | * The pre-wrapper examines the args and pokes the tool |
| 127 | appropriately. It may modify the args; this is why "orig_args" |
| 128 | is also stored. |
| 129 | |
| 130 | The pre-wrapper may choose to 'do' the syscall itself, and |
| 131 | concludes one of three outcomes: |
| 132 | |
| 133 | Success(N) -- syscall is already complete, with success; |
| 134 | result is N |
| 135 | |
| 136 | Fail(N) -- syscall is already complete, with failure; |
| 137 | error code is N |
| 138 | |
| 139 | HandToKernel -- (the usual case): this needs to be given to |
| 140 | the kernel to be done, using the values in |
| 141 | the possibly-modified "args" struct. |
| 142 | |
| 143 | In addition, the pre-wrapper may set some flags: |
| 144 | |
| 145 | MayBlock -- only applicable when outcome==HandToKernel |
| 146 | |
| 147 | PostOnFail -- only applicable when outcome==HandToKernel or Fail |
| 148 | |
| 149 | |
| 150 | * If the pre-outcome is HandToKernel, the syscall is duly handed |
| 151 | off to the kernel (perhaps involving some thread switchery, but |
| 152 | that's not important). This reduces the possible set of outcomes |
| 153 | to either Success(N) or Fail(N). |
| 154 | |
| 155 | |
| 156 | * The outcome (Success(N) or Fail(N)) is written back to the guest |
| 157 | register(s). This is platform specific: |
| 158 | |
| 159 | x86: Success(N) ==> eax = N |
| 160 | Fail(N) ==> eax = -N |
| 161 | |
| 162 | ditto amd64 |
| 163 | |
| 164 | ppc32: Success(N) ==> r3 = N, CR0.SO = 0 |
| 165 | Fail(N) ==> r3 = N, CR0.SO = 1 |
| 166 | |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 167 | Darwin: |
| 168 | x86: Success(N) ==> edx:eax = N, cc = 0 |
| 169 | Fail(N) ==> edx:eax = N, cc = 1 |
| 170 | |
sewardj | b5b8740 | 2011-03-07 16:05:35 +0000 | [diff] [blame] | 171 | s390x: Success(N) ==> r2 = N |
| 172 | Fail(N) ==> r2 = -N |
| 173 | |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 174 | * The post wrapper is called if: |
| 175 | |
| 176 | - it exists, and |
| 177 | - outcome==Success or (outcome==Fail and PostOnFail is set) |
| 178 | |
| 179 | The post wrapper is passed the adulterated syscall args (struct |
| 180 | "args"), and the syscall outcome (viz, Success(N) or Fail(N)). |
| 181 | |
| 182 | There are several other complications, primarily to do with |
| 183 | syscalls getting interrupted, explained in comments in the code. |
| 184 | */ |
| 185 | |
| 186 | /* CAVEATS for writing wrappers. It is important to follow these! |
| 187 | |
| 188 | The macros defined in priv_types_n_macros.h are designed to help |
| 189 | decouple the wrapper logic from the actual representation of |
| 190 | syscall args/results, since these wrappers are designed to work on |
| 191 | multiple platforms. |
| 192 | |
| 193 | Sometimes a PRE wrapper will complete the syscall itself, without |
| 194 | handing it to the kernel. It will use one of SET_STATUS_Success, |
| 195 | SET_STATUS_Failure or SET_STATUS_from_SysRes to set the return |
| 196 | value. It is critical to appreciate that use of the macro does not |
| 197 | immediately cause the underlying guest state to be updated -- that |
| 198 | is done by the driver logic in this file, when the wrapper returns. |
| 199 | |
| 200 | As a result, PRE wrappers of the following form will malfunction: |
| 201 | |
| 202 | PRE(fooble) |
| 203 | { |
| 204 | ... do stuff ... |
| 205 | SET_STATUS_Somehow(...) |
| 206 | |
| 207 | // do something that assumes guest state is up to date |
| 208 | } |
| 209 | |
| 210 | In particular, direct or indirect calls to VG_(poll_signals) after |
| 211 | setting STATUS can cause the guest state to be read (in order to |
| 212 | build signal frames). Do not do this. If you want a signal poll |
| 213 | after the syscall goes through, do "*flags |= SfPollAfter" and the |
| 214 | driver logic will do it for you. |
sewardj | 45f4e7c | 2005-09-27 19:20:21 +0000 | [diff] [blame] | 215 | |
| 216 | ----------- |
| 217 | |
| 218 | Another critical requirement following introduction of new address |
| 219 | space manager (JRS, 20050923): |
| 220 | |
| 221 | In a situation where the mappedness of memory has changed, aspacem |
| 222 | should be notified BEFORE the tool. Hence the following is |
| 223 | correct: |
| 224 | |
| 225 | Bool d = VG_(am_notify_munmap)(s->start, s->end+1 - s->start); |
| 226 | VG_TRACK( die_mem_munmap, s->start, s->end+1 - s->start ); |
| 227 | if (d) |
| 228 | VG_(discard_translations)(s->start, s->end+1 - s->start); |
| 229 | |
| 230 | whilst this is wrong: |
| 231 | |
| 232 | VG_TRACK( die_mem_munmap, s->start, s->end+1 - s->start ); |
| 233 | Bool d = VG_(am_notify_munmap)(s->start, s->end+1 - s->start); |
| 234 | if (d) |
| 235 | VG_(discard_translations)(s->start, s->end+1 - s->start); |
| 236 | |
| 237 | The reason is that the tool may itself ask aspacem for more shadow |
| 238 | memory as a result of the VG_TRACK call. In such a situation it is |
| 239 | critical that aspacem's segment array is up to date -- hence the |
| 240 | need to notify aspacem first. |
| 241 | |
| 242 | ----------- |
| 243 | |
| 244 | Also .. take care to call VG_(discard_translations) whenever |
| 245 | memory with execute permissions is unmapped. |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 246 | */ |
| 247 | |
| 248 | |
| 249 | /* --------------------------------------------------------------------- |
| 250 | Do potentially blocking syscall for the client, and mess with |
| 251 | signal masks at the same time. |
| 252 | ------------------------------------------------------------------ */ |
| 253 | |
| 254 | /* Perform a syscall on behalf of a client thread, using a specific |
| 255 | signal mask. On completion, the signal mask is set to restore_mask |
| 256 | (which presumably blocks almost everything). If a signal happens |
| 257 | during the syscall, the handler should call |
| 258 | VG_(fixup_guest_state_after_syscall_interrupted) to adjust the |
| 259 | thread's context to do the right thing. |
| 260 | |
sewardj | 1b9cd1c | 2005-06-28 19:04:51 +0000 | [diff] [blame] | 261 | The _WRK function is handwritten assembly, implemented per-platform |
| 262 | in coregrind/m_syswrap/syscall-$PLAT.S. It has some very magic |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 263 | properties. See comments at the top of |
| 264 | VG_(fixup_guest_state_after_syscall_interrupted) below for details. |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 265 | |
| 266 | This function (these functions) are required to return zero in case |
| 267 | of success (even if the syscall itself failed), and nonzero if the |
| 268 | sigprocmask-swizzling calls failed. We don't actually care about |
| 269 | the failure values from sigprocmask, although most of the assembly |
| 270 | implementations do attempt to return that, using the convention |
| 271 | 0 for success, or 0x8000 | error-code for failure. |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 272 | */ |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 273 | #if defined(VGO_linux) |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 274 | extern |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 275 | UWord ML_(do_syscall_for_client_WRK)( Word syscallno, |
sewardj | 2537616 | 2005-12-22 19:28:37 +0000 | [diff] [blame] | 276 | void* guest_state, |
| 277 | const vki_sigset_t *syscall_mask, |
| 278 | const vki_sigset_t *restore_mask, |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 279 | Word sigsetSzB ); |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 280 | #elif defined(VGO_darwin) |
| 281 | extern |
| 282 | UWord ML_(do_syscall_for_client_unix_WRK)( Word syscallno, |
| 283 | void* guest_state, |
| 284 | const vki_sigset_t *syscall_mask, |
| 285 | const vki_sigset_t *restore_mask, |
| 286 | Word sigsetSzB ); /* unused */ |
| 287 | extern |
| 288 | UWord ML_(do_syscall_for_client_mach_WRK)( Word syscallno, |
| 289 | void* guest_state, |
| 290 | const vki_sigset_t *syscall_mask, |
| 291 | const vki_sigset_t *restore_mask, |
| 292 | Word sigsetSzB ); /* unused */ |
| 293 | extern |
| 294 | UWord ML_(do_syscall_for_client_mdep_WRK)( Word syscallno, |
| 295 | void* guest_state, |
| 296 | const vki_sigset_t *syscall_mask, |
| 297 | const vki_sigset_t *restore_mask, |
| 298 | Word sigsetSzB ); /* unused */ |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 299 | #else |
| 300 | # error "Unknown OS" |
| 301 | #endif |
| 302 | |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 303 | |
| 304 | static |
| 305 | void do_syscall_for_client ( Int syscallno, |
| 306 | ThreadState* tst, |
| 307 | const vki_sigset_t* syscall_mask ) |
| 308 | { |
| 309 | vki_sigset_t saved; |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 310 | UWord err; |
| 311 | # if defined(VGO_linux) |
| 312 | err = ML_(do_syscall_for_client_WRK)( |
| 313 | syscallno, &tst->arch.vex, |
| 314 | syscall_mask, &saved, sizeof(vki_sigset_t) |
| 315 | ); |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 316 | # elif defined(VGO_darwin) |
| 317 | switch (VG_DARWIN_SYSNO_CLASS(syscallno)) { |
| 318 | case VG_DARWIN_SYSCALL_CLASS_UNIX: |
| 319 | err = ML_(do_syscall_for_client_unix_WRK)( |
njn | 1a1e95c | 2009-06-03 06:50:06 +0000 | [diff] [blame] | 320 | VG_DARWIN_SYSNO_FOR_KERNEL(syscallno), &tst->arch.vex, |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 321 | syscall_mask, &saved, 0/*unused:sigsetSzB*/ |
| 322 | ); |
| 323 | break; |
| 324 | case VG_DARWIN_SYSCALL_CLASS_MACH: |
| 325 | err = ML_(do_syscall_for_client_mach_WRK)( |
njn | 1a1e95c | 2009-06-03 06:50:06 +0000 | [diff] [blame] | 326 | VG_DARWIN_SYSNO_FOR_KERNEL(syscallno), &tst->arch.vex, |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 327 | syscall_mask, &saved, 0/*unused:sigsetSzB*/ |
| 328 | ); |
| 329 | break; |
| 330 | case VG_DARWIN_SYSCALL_CLASS_MDEP: |
| 331 | err = ML_(do_syscall_for_client_mdep_WRK)( |
njn | 1a1e95c | 2009-06-03 06:50:06 +0000 | [diff] [blame] | 332 | VG_DARWIN_SYSNO_FOR_KERNEL(syscallno), &tst->arch.vex, |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 333 | syscall_mask, &saved, 0/*unused:sigsetSzB*/ |
| 334 | ); |
| 335 | break; |
| 336 | default: |
| 337 | vg_assert(0); |
| 338 | /*NOTREACHED*/ |
| 339 | break; |
| 340 | } |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 341 | # else |
| 342 | # error "Unknown OS" |
| 343 | # endif |
sewardj | 2537616 | 2005-12-22 19:28:37 +0000 | [diff] [blame] | 344 | vg_assert2( |
| 345 | err == 0, |
| 346 | "ML_(do_syscall_for_client_WRK): sigprocmask error %d", |
| 347 | (Int)(err & 0xFFF) |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 348 | ); |
| 349 | } |
| 350 | |
| 351 | |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 352 | /* --------------------------------------------------------------------- |
| 353 | Impedance matchers and misc helpers |
| 354 | ------------------------------------------------------------------ */ |
| 355 | |
| 356 | static |
| 357 | Bool eq_SyscallArgs ( SyscallArgs* a1, SyscallArgs* a2 ) |
| 358 | { |
| 359 | return a1->sysno == a2->sysno |
| 360 | && a1->arg1 == a2->arg1 |
| 361 | && a1->arg2 == a2->arg2 |
| 362 | && a1->arg3 == a2->arg3 |
| 363 | && a1->arg4 == a2->arg4 |
| 364 | && a1->arg5 == a2->arg5 |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 365 | && a1->arg6 == a2->arg6 |
| 366 | && a1->arg7 == a2->arg7 |
| 367 | && a1->arg8 == a2->arg8; |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 368 | } |
| 369 | |
| 370 | static |
| 371 | Bool eq_SyscallStatus ( SyscallStatus* s1, SyscallStatus* s2 ) |
| 372 | { |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 373 | /* was: return s1->what == s2->what && sr_EQ( s1->sres, s2->sres ); */ |
| 374 | if (s1->what == s2->what && sr_EQ( s1->sres, s2->sres )) |
| 375 | return True; |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 376 | # if defined(VGO_darwin) |
| 377 | /* Darwin-specific debugging guff */ |
| 378 | vg_assert(s1->what == s2->what); |
| 379 | VG_(printf)("eq_SyscallStatus:\n"); |
| 380 | VG_(printf)(" {%lu %lu %u}\n", s1->sres._wLO, s1->sres._wHI, s1->sres._mode); |
| 381 | VG_(printf)(" {%lu %lu %u}\n", s2->sres._wLO, s2->sres._wHI, s2->sres._mode); |
| 382 | vg_assert(0); |
| 383 | # endif |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 384 | return False; |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 385 | } |
| 386 | |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 387 | /* Convert between SysRes and SyscallStatus, to the extent possible. */ |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 388 | |
| 389 | static |
| 390 | SyscallStatus convert_SysRes_to_SyscallStatus ( SysRes res ) |
| 391 | { |
| 392 | SyscallStatus status; |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 393 | status.what = SsComplete; |
| 394 | status.sres = res; |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 395 | return status; |
| 396 | } |
| 397 | |
| 398 | |
| 399 | /* Impedance matchers. These convert syscall arg or result data from |
| 400 | the platform-specific in-guest-state format to the canonical |
| 401 | formats, and back. */ |
| 402 | |
| 403 | static |
| 404 | void getSyscallArgsFromGuestState ( /*OUT*/SyscallArgs* canonical, |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 405 | /*IN*/ VexGuestArchState* gst_vanilla, |
| 406 | /*IN*/ UInt trc ) |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 407 | { |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 408 | #if defined(VGP_x86_linux) |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 409 | VexGuestX86State* gst = (VexGuestX86State*)gst_vanilla; |
| 410 | canonical->sysno = gst->guest_EAX; |
| 411 | canonical->arg1 = gst->guest_EBX; |
| 412 | canonical->arg2 = gst->guest_ECX; |
| 413 | canonical->arg3 = gst->guest_EDX; |
| 414 | canonical->arg4 = gst->guest_ESI; |
| 415 | canonical->arg5 = gst->guest_EDI; |
| 416 | canonical->arg6 = gst->guest_EBP; |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 417 | canonical->arg7 = 0; |
| 418 | canonical->arg8 = 0; |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 419 | |
| 420 | #elif defined(VGP_amd64_linux) |
sewardj | e7aa4ae | 2005-06-09 12:43:42 +0000 | [diff] [blame] | 421 | VexGuestAMD64State* gst = (VexGuestAMD64State*)gst_vanilla; |
| 422 | canonical->sysno = gst->guest_RAX; |
| 423 | canonical->arg1 = gst->guest_RDI; |
| 424 | canonical->arg2 = gst->guest_RSI; |
| 425 | canonical->arg3 = gst->guest_RDX; |
| 426 | canonical->arg4 = gst->guest_R10; |
| 427 | canonical->arg5 = gst->guest_R8; |
| 428 | canonical->arg6 = gst->guest_R9; |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 429 | canonical->arg7 = 0; |
| 430 | canonical->arg8 = 0; |
| 431 | |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 432 | #elif defined(VGP_ppc32_linux) |
| 433 | VexGuestPPC32State* gst = (VexGuestPPC32State*)gst_vanilla; |
| 434 | canonical->sysno = gst->guest_GPR0; |
| 435 | canonical->arg1 = gst->guest_GPR3; |
| 436 | canonical->arg2 = gst->guest_GPR4; |
| 437 | canonical->arg3 = gst->guest_GPR5; |
| 438 | canonical->arg4 = gst->guest_GPR6; |
| 439 | canonical->arg5 = gst->guest_GPR7; |
| 440 | canonical->arg6 = gst->guest_GPR8; |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 441 | canonical->arg7 = 0; |
| 442 | canonical->arg8 = 0; |
| 443 | |
sewardj | 2c48c7b | 2005-11-29 13:05:56 +0000 | [diff] [blame] | 444 | #elif defined(VGP_ppc64_linux) |
| 445 | VexGuestPPC64State* gst = (VexGuestPPC64State*)gst_vanilla; |
| 446 | canonical->sysno = gst->guest_GPR0; |
| 447 | canonical->arg1 = gst->guest_GPR3; |
| 448 | canonical->arg2 = gst->guest_GPR4; |
| 449 | canonical->arg3 = gst->guest_GPR5; |
| 450 | canonical->arg4 = gst->guest_GPR6; |
| 451 | canonical->arg5 = gst->guest_GPR7; |
| 452 | canonical->arg6 = gst->guest_GPR8; |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 453 | canonical->arg7 = 0; |
| 454 | canonical->arg8 = 0; |
| 455 | |
sewardj | 59570ff | 2010-01-01 11:59:33 +0000 | [diff] [blame] | 456 | #elif defined(VGP_arm_linux) |
| 457 | VexGuestARMState* gst = (VexGuestARMState*)gst_vanilla; |
| 458 | canonical->sysno = gst->guest_R7; |
| 459 | canonical->arg1 = gst->guest_R0; |
| 460 | canonical->arg2 = gst->guest_R1; |
| 461 | canonical->arg3 = gst->guest_R2; |
| 462 | canonical->arg4 = gst->guest_R3; |
| 463 | canonical->arg5 = gst->guest_R4; |
| 464 | canonical->arg6 = gst->guest_R5; |
| 465 | canonical->arg7 = 0; |
| 466 | canonical->arg8 = 0; |
| 467 | |
sewardj | f0c1250 | 2014-01-12 12:54:00 +0000 | [diff] [blame] | 468 | #elif defined(VGP_arm64_linux) |
| 469 | VexGuestARM64State* gst = (VexGuestARM64State*)gst_vanilla; |
| 470 | canonical->sysno = gst->guest_X8; |
| 471 | canonical->arg1 = gst->guest_X0; |
| 472 | canonical->arg2 = gst->guest_X1; |
| 473 | canonical->arg3 = gst->guest_X2; |
| 474 | canonical->arg4 = gst->guest_X3; |
| 475 | canonical->arg5 = gst->guest_X4; |
| 476 | canonical->arg6 = gst->guest_X5; |
| 477 | canonical->arg7 = 0; |
| 478 | canonical->arg8 = 0; |
| 479 | |
sewardj | 5db1540 | 2012-06-07 09:13:21 +0000 | [diff] [blame] | 480 | #elif defined(VGP_mips32_linux) |
| 481 | VexGuestMIPS32State* gst = (VexGuestMIPS32State*)gst_vanilla; |
| 482 | canonical->sysno = gst->guest_r2; // v0 |
dejanj | 9c6b05d | 2013-12-27 09:06:55 +0000 | [diff] [blame] | 483 | if (canonical->sysno == __NR_exit) { |
| 484 | canonical->arg1 = gst->guest_r4; // a0 |
| 485 | canonical->arg2 = 0; |
| 486 | canonical->arg3 = 0; |
| 487 | canonical->arg4 = 0; |
| 488 | canonical->arg5 = 0; |
| 489 | canonical->arg6 = 0; |
| 490 | canonical->arg8 = 0; |
| 491 | } else if (canonical->sysno != __NR_syscall) { |
sewardj | 5db1540 | 2012-06-07 09:13:21 +0000 | [diff] [blame] | 492 | canonical->arg1 = gst->guest_r4; // a0 |
| 493 | canonical->arg2 = gst->guest_r5; // a1 |
| 494 | canonical->arg3 = gst->guest_r6; // a2 |
| 495 | canonical->arg4 = gst->guest_r7; // a3 |
| 496 | canonical->arg5 = *((UInt*) (gst->guest_r29 + 16)); // 16(guest_SP/sp) |
| 497 | canonical->arg6 = *((UInt*) (gst->guest_r29 + 20)); // 20(sp) |
petarj | 44d2c2b | 2012-08-05 02:22:52 +0000 | [diff] [blame] | 498 | canonical->arg8 = 0; |
sewardj | 5db1540 | 2012-06-07 09:13:21 +0000 | [diff] [blame] | 499 | } else { |
| 500 | // Fixme hack handle syscall() |
| 501 | canonical->sysno = gst->guest_r4; // a0 |
| 502 | canonical->arg1 = gst->guest_r5; // a1 |
| 503 | canonical->arg2 = gst->guest_r6; // a2 |
| 504 | canonical->arg3 = gst->guest_r7; // a3 |
| 505 | canonical->arg4 = *((UInt*) (gst->guest_r29 + 16)); // 16(guest_SP/sp) |
| 506 | canonical->arg5 = *((UInt*) (gst->guest_r29 + 20)); // 20(guest_SP/sp) |
| 507 | canonical->arg6 = *((UInt*) (gst->guest_r29 + 24)); // 24(guest_SP/sp) |
petarj | 44d2c2b | 2012-08-05 02:22:52 +0000 | [diff] [blame] | 508 | canonical->arg8 = __NR_syscall; |
sewardj | 5db1540 | 2012-06-07 09:13:21 +0000 | [diff] [blame] | 509 | } |
| 510 | |
petarj | 4df0bfc | 2013-02-27 23:17:33 +0000 | [diff] [blame] | 511 | #elif defined(VGP_mips64_linux) |
| 512 | VexGuestMIPS64State* gst = (VexGuestMIPS64State*)gst_vanilla; |
| 513 | canonical->sysno = gst->guest_r2; // v0 |
| 514 | canonical->arg1 = gst->guest_r4; // a0 |
| 515 | canonical->arg2 = gst->guest_r5; // a1 |
| 516 | canonical->arg3 = gst->guest_r6; // a2 |
| 517 | canonical->arg4 = gst->guest_r7; // a3 |
| 518 | canonical->arg5 = gst->guest_r8; // a4 |
| 519 | canonical->arg6 = gst->guest_r9; // a5 |
| 520 | |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 521 | #elif defined(VGP_x86_darwin) |
| 522 | VexGuestX86State* gst = (VexGuestX86State*)gst_vanilla; |
| 523 | UWord *stack = (UWord *)gst->guest_ESP; |
| 524 | // GrP fixme hope syscalls aren't called with really shallow stacks... |
| 525 | canonical->sysno = gst->guest_EAX; |
| 526 | if (canonical->sysno != 0) { |
| 527 | // stack[0] is return address |
| 528 | canonical->arg1 = stack[1]; |
| 529 | canonical->arg2 = stack[2]; |
| 530 | canonical->arg3 = stack[3]; |
| 531 | canonical->arg4 = stack[4]; |
| 532 | canonical->arg5 = stack[5]; |
| 533 | canonical->arg6 = stack[6]; |
| 534 | canonical->arg7 = stack[7]; |
| 535 | canonical->arg8 = stack[8]; |
| 536 | } else { |
| 537 | // GrP fixme hack handle syscall() |
| 538 | // GrP fixme what about __syscall() ? |
| 539 | // stack[0] is return address |
| 540 | // DDD: the tool can't see that the params have been shifted! Can |
| 541 | // lead to incorrect checking, I think, because the PRRAn/PSARn |
| 542 | // macros will mention the pre-shifted args. |
| 543 | canonical->sysno = stack[1]; |
| 544 | vg_assert(canonical->sysno != 0); |
| 545 | canonical->arg1 = stack[2]; |
| 546 | canonical->arg2 = stack[3]; |
| 547 | canonical->arg3 = stack[4]; |
| 548 | canonical->arg4 = stack[5]; |
| 549 | canonical->arg5 = stack[6]; |
| 550 | canonical->arg6 = stack[7]; |
| 551 | canonical->arg7 = stack[8]; |
| 552 | canonical->arg8 = stack[9]; |
| 553 | |
njn | 1a1e95c | 2009-06-03 06:50:06 +0000 | [diff] [blame] | 554 | PRINT("SYSCALL[%d,?](%s) syscall(%s, ...); please stand by...\n", |
| 555 | VG_(getpid)(), /*tid,*/ |
| 556 | VG_SYSNUM_STRING(0), VG_SYSNUM_STRING(canonical->sysno)); |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 557 | } |
| 558 | |
njn | 1a1e95c | 2009-06-03 06:50:06 +0000 | [diff] [blame] | 559 | // Here we determine what kind of syscall it was by looking at the |
| 560 | // interrupt kind, and then encode the syscall number using the 64-bit |
| 561 | // encoding for Valgrind's internal use. |
| 562 | // |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 563 | // DDD: Would it be better to stash the JMP kind into the Darwin |
| 564 | // thread state rather than passing in the trc? |
| 565 | switch (trc) { |
| 566 | case VEX_TRC_JMP_SYS_INT128: |
| 567 | // int $0x80 = Unix, 64-bit result |
| 568 | vg_assert(canonical->sysno >= 0); |
| 569 | canonical->sysno = VG_DARWIN_SYSCALL_CONSTRUCT_UNIX(canonical->sysno); |
| 570 | break; |
| 571 | case VEX_TRC_JMP_SYS_SYSENTER: |
| 572 | // syscall = Unix, 32-bit result |
| 573 | // OR Mach, 32-bit result |
| 574 | if (canonical->sysno >= 0) { |
njn | 1a1e95c | 2009-06-03 06:50:06 +0000 | [diff] [blame] | 575 | // GrP fixme hack: 0xffff == I386_SYSCALL_NUMBER_MASK |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 576 | canonical->sysno = VG_DARWIN_SYSCALL_CONSTRUCT_UNIX(canonical->sysno |
| 577 | & 0xffff); |
| 578 | } else { |
| 579 | canonical->sysno = VG_DARWIN_SYSCALL_CONSTRUCT_MACH(-canonical->sysno); |
| 580 | } |
| 581 | break; |
| 582 | case VEX_TRC_JMP_SYS_INT129: |
| 583 | // int $0x81 = Mach, 32-bit result |
| 584 | vg_assert(canonical->sysno < 0); |
| 585 | canonical->sysno = VG_DARWIN_SYSCALL_CONSTRUCT_MACH(-canonical->sysno); |
| 586 | break; |
| 587 | case VEX_TRC_JMP_SYS_INT130: |
| 588 | // int $0x82 = mdep, 32-bit result |
| 589 | vg_assert(canonical->sysno >= 0); |
| 590 | canonical->sysno = VG_DARWIN_SYSCALL_CONSTRUCT_MDEP(canonical->sysno); |
| 591 | break; |
| 592 | default: |
| 593 | vg_assert(0); |
| 594 | break; |
| 595 | } |
| 596 | |
| 597 | #elif defined(VGP_amd64_darwin) |
| 598 | VexGuestAMD64State* gst = (VexGuestAMD64State*)gst_vanilla; |
| 599 | UWord *stack = (UWord *)gst->guest_RSP; |
| 600 | |
| 601 | vg_assert(trc == VEX_TRC_JMP_SYS_SYSCALL); |
| 602 | |
| 603 | // GrP fixme hope syscalls aren't called with really shallow stacks... |
| 604 | canonical->sysno = gst->guest_RAX; |
| 605 | if (canonical->sysno != __NR_syscall) { |
| 606 | // stack[0] is return address |
| 607 | canonical->arg1 = gst->guest_RDI; |
| 608 | canonical->arg2 = gst->guest_RSI; |
| 609 | canonical->arg3 = gst->guest_RDX; |
| 610 | canonical->arg4 = gst->guest_R10; // not rcx with syscall insn |
| 611 | canonical->arg5 = gst->guest_R8; |
| 612 | canonical->arg6 = gst->guest_R9; |
| 613 | canonical->arg7 = stack[1]; |
| 614 | canonical->arg8 = stack[2]; |
| 615 | } else { |
| 616 | // GrP fixme hack handle syscall() |
| 617 | // GrP fixme what about __syscall() ? |
| 618 | // stack[0] is return address |
| 619 | // DDD: the tool can't see that the params have been shifted! Can |
| 620 | // lead to incorrect checking, I think, because the PRRAn/PSARn |
| 621 | // macros will mention the pre-shifted args. |
| 622 | canonical->sysno = VG_DARWIN_SYSCALL_CONSTRUCT_UNIX(gst->guest_RDI); |
| 623 | vg_assert(canonical->sysno != __NR_syscall); |
| 624 | canonical->arg1 = gst->guest_RSI; |
| 625 | canonical->arg2 = gst->guest_RDX; |
| 626 | canonical->arg3 = gst->guest_R10; // not rcx with syscall insn |
| 627 | canonical->arg4 = gst->guest_R8; |
| 628 | canonical->arg5 = gst->guest_R9; |
| 629 | canonical->arg6 = stack[1]; |
| 630 | canonical->arg7 = stack[2]; |
| 631 | canonical->arg8 = stack[3]; |
| 632 | |
njn | 1a1e95c | 2009-06-03 06:50:06 +0000 | [diff] [blame] | 633 | PRINT("SYSCALL[%d,?](%s) syscall(%s, ...); please stand by...\n", |
| 634 | VG_(getpid)(), /*tid,*/ |
| 635 | VG_SYSNUM_STRING(0), VG_SYSNUM_STRING(canonical->sysno)); |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 636 | } |
| 637 | |
| 638 | // no canonical->sysno adjustment needed |
| 639 | |
sewardj | b5b8740 | 2011-03-07 16:05:35 +0000 | [diff] [blame] | 640 | #elif defined(VGP_s390x_linux) |
| 641 | VexGuestS390XState* gst = (VexGuestS390XState*)gst_vanilla; |
| 642 | canonical->sysno = gst->guest_SYSNO; |
| 643 | canonical->arg1 = gst->guest_r2; |
| 644 | canonical->arg2 = gst->guest_r3; |
| 645 | canonical->arg3 = gst->guest_r4; |
| 646 | canonical->arg4 = gst->guest_r5; |
| 647 | canonical->arg5 = gst->guest_r6; |
| 648 | canonical->arg6 = gst->guest_r7; |
| 649 | canonical->arg7 = 0; |
| 650 | canonical->arg8 = 0; |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 651 | #else |
| 652 | # error "getSyscallArgsFromGuestState: unknown arch" |
| 653 | #endif |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 654 | } |
| 655 | |
| 656 | static |
| 657 | void putSyscallArgsIntoGuestState ( /*IN*/ SyscallArgs* canonical, |
| 658 | /*OUT*/VexGuestArchState* gst_vanilla ) |
| 659 | { |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 660 | #if defined(VGP_x86_linux) |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 661 | VexGuestX86State* gst = (VexGuestX86State*)gst_vanilla; |
| 662 | gst->guest_EAX = canonical->sysno; |
| 663 | gst->guest_EBX = canonical->arg1; |
| 664 | gst->guest_ECX = canonical->arg2; |
| 665 | gst->guest_EDX = canonical->arg3; |
| 666 | gst->guest_ESI = canonical->arg4; |
| 667 | gst->guest_EDI = canonical->arg5; |
| 668 | gst->guest_EBP = canonical->arg6; |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 669 | |
| 670 | #elif defined(VGP_amd64_linux) |
sewardj | e7aa4ae | 2005-06-09 12:43:42 +0000 | [diff] [blame] | 671 | VexGuestAMD64State* gst = (VexGuestAMD64State*)gst_vanilla; |
| 672 | gst->guest_RAX = canonical->sysno; |
| 673 | gst->guest_RDI = canonical->arg1; |
| 674 | gst->guest_RSI = canonical->arg2; |
| 675 | gst->guest_RDX = canonical->arg3; |
| 676 | gst->guest_R10 = canonical->arg4; |
| 677 | gst->guest_R8 = canonical->arg5; |
| 678 | gst->guest_R9 = canonical->arg6; |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 679 | |
| 680 | #elif defined(VGP_ppc32_linux) |
| 681 | VexGuestPPC32State* gst = (VexGuestPPC32State*)gst_vanilla; |
| 682 | gst->guest_GPR0 = canonical->sysno; |
| 683 | gst->guest_GPR3 = canonical->arg1; |
| 684 | gst->guest_GPR4 = canonical->arg2; |
| 685 | gst->guest_GPR5 = canonical->arg3; |
| 686 | gst->guest_GPR6 = canonical->arg4; |
| 687 | gst->guest_GPR7 = canonical->arg5; |
| 688 | gst->guest_GPR8 = canonical->arg6; |
| 689 | |
sewardj | 2c48c7b | 2005-11-29 13:05:56 +0000 | [diff] [blame] | 690 | #elif defined(VGP_ppc64_linux) |
| 691 | VexGuestPPC64State* gst = (VexGuestPPC64State*)gst_vanilla; |
| 692 | gst->guest_GPR0 = canonical->sysno; |
| 693 | gst->guest_GPR3 = canonical->arg1; |
| 694 | gst->guest_GPR4 = canonical->arg2; |
| 695 | gst->guest_GPR5 = canonical->arg3; |
| 696 | gst->guest_GPR6 = canonical->arg4; |
| 697 | gst->guest_GPR7 = canonical->arg5; |
| 698 | gst->guest_GPR8 = canonical->arg6; |
| 699 | |
sewardj | 59570ff | 2010-01-01 11:59:33 +0000 | [diff] [blame] | 700 | #elif defined(VGP_arm_linux) |
| 701 | VexGuestARMState* gst = (VexGuestARMState*)gst_vanilla; |
| 702 | gst->guest_R7 = canonical->sysno; |
| 703 | gst->guest_R0 = canonical->arg1; |
| 704 | gst->guest_R1 = canonical->arg2; |
| 705 | gst->guest_R2 = canonical->arg3; |
| 706 | gst->guest_R3 = canonical->arg4; |
| 707 | gst->guest_R4 = canonical->arg5; |
| 708 | gst->guest_R5 = canonical->arg6; |
| 709 | |
sewardj | f0c1250 | 2014-01-12 12:54:00 +0000 | [diff] [blame] | 710 | #elif defined(VGP_arm64_linux) |
| 711 | VexGuestARM64State* gst = (VexGuestARM64State*)gst_vanilla; |
| 712 | gst->guest_X8 = canonical->sysno; |
| 713 | gst->guest_X0 = canonical->arg1; |
| 714 | gst->guest_X1 = canonical->arg2; |
| 715 | gst->guest_X2 = canonical->arg3; |
| 716 | gst->guest_X3 = canonical->arg4; |
| 717 | gst->guest_X4 = canonical->arg5; |
| 718 | gst->guest_X5 = canonical->arg6; |
| 719 | |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 720 | #elif defined(VGP_x86_darwin) |
| 721 | VexGuestX86State* gst = (VexGuestX86State*)gst_vanilla; |
| 722 | UWord *stack = (UWord *)gst->guest_ESP; |
| 723 | |
njn | 1a1e95c | 2009-06-03 06:50:06 +0000 | [diff] [blame] | 724 | gst->guest_EAX = VG_DARWIN_SYSNO_FOR_KERNEL(canonical->sysno); |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 725 | |
| 726 | // GrP fixme? gst->guest_TEMP_EFLAG_C = 0; |
| 727 | // stack[0] is return address |
| 728 | stack[1] = canonical->arg1; |
| 729 | stack[2] = canonical->arg2; |
| 730 | stack[3] = canonical->arg3; |
| 731 | stack[4] = canonical->arg4; |
| 732 | stack[5] = canonical->arg5; |
| 733 | stack[6] = canonical->arg6; |
| 734 | stack[7] = canonical->arg7; |
| 735 | stack[8] = canonical->arg8; |
| 736 | |
| 737 | #elif defined(VGP_amd64_darwin) |
| 738 | VexGuestAMD64State* gst = (VexGuestAMD64State*)gst_vanilla; |
| 739 | UWord *stack = (UWord *)gst->guest_RSP; |
| 740 | |
njn | 1a1e95c | 2009-06-03 06:50:06 +0000 | [diff] [blame] | 741 | gst->guest_RAX = VG_DARWIN_SYSNO_FOR_KERNEL(canonical->sysno); |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 742 | // GrP fixme? gst->guest_TEMP_EFLAG_C = 0; |
| 743 | |
| 744 | // stack[0] is return address |
| 745 | gst->guest_RDI = canonical->arg1; |
| 746 | gst->guest_RSI = canonical->arg2; |
| 747 | gst->guest_RDX = canonical->arg3; |
| 748 | gst->guest_RCX = canonical->arg4; |
| 749 | gst->guest_R8 = canonical->arg5; |
| 750 | gst->guest_R9 = canonical->arg6; |
| 751 | stack[1] = canonical->arg7; |
| 752 | stack[2] = canonical->arg8; |
| 753 | |
sewardj | b5b8740 | 2011-03-07 16:05:35 +0000 | [diff] [blame] | 754 | #elif defined(VGP_s390x_linux) |
| 755 | VexGuestS390XState* gst = (VexGuestS390XState*)gst_vanilla; |
| 756 | gst->guest_SYSNO = canonical->sysno; |
| 757 | gst->guest_r2 = canonical->arg1; |
| 758 | gst->guest_r3 = canonical->arg2; |
| 759 | gst->guest_r4 = canonical->arg3; |
| 760 | gst->guest_r5 = canonical->arg4; |
| 761 | gst->guest_r6 = canonical->arg5; |
| 762 | gst->guest_r7 = canonical->arg6; |
| 763 | |
sewardj | 5db1540 | 2012-06-07 09:13:21 +0000 | [diff] [blame] | 764 | #elif defined(VGP_mips32_linux) |
| 765 | VexGuestMIPS32State* gst = (VexGuestMIPS32State*)gst_vanilla; |
petarj | 44d2c2b | 2012-08-05 02:22:52 +0000 | [diff] [blame] | 766 | if (canonical->arg8 != __NR_syscall) { |
| 767 | gst->guest_r2 = canonical->sysno; |
| 768 | gst->guest_r4 = canonical->arg1; |
| 769 | gst->guest_r5 = canonical->arg2; |
| 770 | gst->guest_r6 = canonical->arg3; |
| 771 | gst->guest_r7 = canonical->arg4; |
sewardj | f0c1250 | 2014-01-12 12:54:00 +0000 | [diff] [blame] | 772 | *((UInt*) (gst->guest_r29 + 16)) = canonical->arg5; // 16(guest_GPR29/sp) |
| 773 | *((UInt*) (gst->guest_r29 + 20)) = canonical->arg6; // 20(sp) |
petarj | 44d2c2b | 2012-08-05 02:22:52 +0000 | [diff] [blame] | 774 | } else { |
| 775 | canonical->arg8 = 0; |
| 776 | gst->guest_r2 = __NR_syscall; |
| 777 | gst->guest_r4 = canonical->sysno; |
| 778 | gst->guest_r5 = canonical->arg1; |
| 779 | gst->guest_r6 = canonical->arg2; |
| 780 | gst->guest_r7 = canonical->arg3; |
sewardj | f0c1250 | 2014-01-12 12:54:00 +0000 | [diff] [blame] | 781 | *((UInt*) (gst->guest_r29 + 16)) = canonical->arg4; // 16(guest_GPR29/sp) |
| 782 | *((UInt*) (gst->guest_r29 + 20)) = canonical->arg5; // 20(sp) |
| 783 | *((UInt*) (gst->guest_r29 + 24)) = canonical->arg6; // 24(sp) |
petarj | 44d2c2b | 2012-08-05 02:22:52 +0000 | [diff] [blame] | 784 | } |
petarj | 4df0bfc | 2013-02-27 23:17:33 +0000 | [diff] [blame] | 785 | |
| 786 | #elif defined(VGP_mips64_linux) |
| 787 | VexGuestMIPS64State* gst = (VexGuestMIPS64State*)gst_vanilla; |
| 788 | gst->guest_r2 = canonical->sysno; |
| 789 | gst->guest_r4 = canonical->arg1; |
| 790 | gst->guest_r5 = canonical->arg2; |
| 791 | gst->guest_r6 = canonical->arg3; |
| 792 | gst->guest_r7 = canonical->arg4; |
| 793 | gst->guest_r8 = canonical->arg5; |
| 794 | gst->guest_r9 = canonical->arg6; |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 795 | #else |
| 796 | # error "putSyscallArgsIntoGuestState: unknown arch" |
| 797 | #endif |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 798 | } |
| 799 | |
| 800 | static |
| 801 | void getSyscallStatusFromGuestState ( /*OUT*/SyscallStatus* canonical, |
| 802 | /*IN*/ VexGuestArchState* gst_vanilla ) |
| 803 | { |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 804 | # if defined(VGP_x86_linux) |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 805 | VexGuestX86State* gst = (VexGuestX86State*)gst_vanilla; |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 806 | canonical->sres = VG_(mk_SysRes_x86_linux)( gst->guest_EAX ); |
| 807 | canonical->what = SsComplete; |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 808 | |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 809 | # elif defined(VGP_amd64_linux) |
sewardj | e7aa4ae | 2005-06-09 12:43:42 +0000 | [diff] [blame] | 810 | VexGuestAMD64State* gst = (VexGuestAMD64State*)gst_vanilla; |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 811 | canonical->sres = VG_(mk_SysRes_amd64_linux)( gst->guest_RAX ); |
| 812 | canonical->what = SsComplete; |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 813 | |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 814 | # elif defined(VGP_ppc32_linux) |
| 815 | VexGuestPPC32State* gst = (VexGuestPPC32State*)gst_vanilla; |
| 816 | UInt cr = LibVEX_GuestPPC32_get_CR( gst ); |
| 817 | UInt cr0so = (cr >> 28) & 1; |
| 818 | canonical->sres = VG_(mk_SysRes_ppc32_linux)( gst->guest_GPR3, cr0so ); |
| 819 | canonical->what = SsComplete; |
| 820 | |
| 821 | # elif defined(VGP_ppc64_linux) |
| 822 | VexGuestPPC64State* gst = (VexGuestPPC64State*)gst_vanilla; |
| 823 | UInt cr = LibVEX_GuestPPC64_get_CR( gst ); |
| 824 | UInt cr0so = (cr >> 28) & 1; |
| 825 | canonical->sres = VG_(mk_SysRes_ppc64_linux)( gst->guest_GPR3, cr0so ); |
| 826 | canonical->what = SsComplete; |
| 827 | |
sewardj | 59570ff | 2010-01-01 11:59:33 +0000 | [diff] [blame] | 828 | # elif defined(VGP_arm_linux) |
| 829 | VexGuestARMState* gst = (VexGuestARMState*)gst_vanilla; |
| 830 | canonical->sres = VG_(mk_SysRes_arm_linux)( gst->guest_R0 ); |
| 831 | canonical->what = SsComplete; |
| 832 | |
sewardj | f0c1250 | 2014-01-12 12:54:00 +0000 | [diff] [blame] | 833 | # elif defined(VGP_arm64_linux) |
| 834 | VexGuestARM64State* gst = (VexGuestARM64State*)gst_vanilla; |
| 835 | canonical->sres = VG_(mk_SysRes_arm64_linux)( gst->guest_X0 ); |
| 836 | canonical->what = SsComplete; |
| 837 | |
sewardj | 5db1540 | 2012-06-07 09:13:21 +0000 | [diff] [blame] | 838 | # elif defined(VGP_mips32_linux) |
| 839 | VexGuestMIPS32State* gst = (VexGuestMIPS32State*)gst_vanilla; |
| 840 | UInt v0 = gst->guest_r2; // v0 |
| 841 | UInt v1 = gst->guest_r3; // v1 |
| 842 | UInt a3 = gst->guest_r7; // a3 |
| 843 | canonical->sres = VG_(mk_SysRes_mips32_linux)( v0, v1, a3 ); |
| 844 | canonical->what = SsComplete; |
| 845 | |
petarj | 4df0bfc | 2013-02-27 23:17:33 +0000 | [diff] [blame] | 846 | # elif defined(VGP_mips64_linux) |
| 847 | VexGuestMIPS64State* gst = (VexGuestMIPS64State*)gst_vanilla; |
| 848 | ULong v0 = gst->guest_r2; // v0 |
| 849 | ULong v1 = gst->guest_r3; // v1 |
| 850 | ULong a3 = gst->guest_r7; // a3 |
| 851 | canonical->sres = VG_(mk_SysRes_mips64_linux)(v0, v1, a3); |
| 852 | canonical->what = SsComplete; |
| 853 | |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 854 | # elif defined(VGP_x86_darwin) |
| 855 | /* duplicates logic in m_signals.VG_UCONTEXT_SYSCALL_SYSRES */ |
| 856 | VexGuestX86State* gst = (VexGuestX86State*)gst_vanilla; |
| 857 | UInt carry = 1 & LibVEX_GuestX86_get_eflags(gst); |
| 858 | UInt err = 0; |
| 859 | UInt wLO = 0; |
| 860 | UInt wHI = 0; |
| 861 | switch (gst->guest_SC_CLASS) { |
| 862 | case VG_DARWIN_SYSCALL_CLASS_UNIX: |
| 863 | // int $0x80 = Unix, 64-bit result |
| 864 | err = carry; |
| 865 | wLO = gst->guest_EAX; |
| 866 | wHI = gst->guest_EDX; |
| 867 | break; |
| 868 | case VG_DARWIN_SYSCALL_CLASS_MACH: |
| 869 | // int $0x81 = Mach, 32-bit result |
| 870 | wLO = gst->guest_EAX; |
| 871 | break; |
| 872 | case VG_DARWIN_SYSCALL_CLASS_MDEP: |
| 873 | // int $0x82 = mdep, 32-bit result |
| 874 | wLO = gst->guest_EAX; |
| 875 | break; |
| 876 | default: |
| 877 | vg_assert(0); |
| 878 | break; |
| 879 | } |
| 880 | canonical->sres = VG_(mk_SysRes_x86_darwin)( |
| 881 | gst->guest_SC_CLASS, err ? True : False, |
| 882 | wHI, wLO |
| 883 | ); |
| 884 | canonical->what = SsComplete; |
| 885 | |
| 886 | # elif defined(VGP_amd64_darwin) |
| 887 | /* duplicates logic in m_signals.VG_UCONTEXT_SYSCALL_SYSRES */ |
| 888 | VexGuestAMD64State* gst = (VexGuestAMD64State*)gst_vanilla; |
| 889 | ULong carry = 1 & LibVEX_GuestAMD64_get_rflags(gst); |
| 890 | ULong err = 0; |
| 891 | ULong wLO = 0; |
| 892 | ULong wHI = 0; |
| 893 | switch (gst->guest_SC_CLASS) { |
| 894 | case VG_DARWIN_SYSCALL_CLASS_UNIX: |
| 895 | // syscall = Unix, 128-bit result |
| 896 | err = carry; |
| 897 | wLO = gst->guest_RAX; |
| 898 | wHI = gst->guest_RDX; |
| 899 | break; |
| 900 | case VG_DARWIN_SYSCALL_CLASS_MACH: |
| 901 | // syscall = Mach, 64-bit result |
| 902 | wLO = gst->guest_RAX; |
| 903 | break; |
| 904 | case VG_DARWIN_SYSCALL_CLASS_MDEP: |
| 905 | // syscall = mdep, 64-bit result |
| 906 | wLO = gst->guest_RAX; |
| 907 | break; |
| 908 | default: |
| 909 | vg_assert(0); |
| 910 | break; |
| 911 | } |
| 912 | canonical->sres = VG_(mk_SysRes_amd64_darwin)( |
| 913 | gst->guest_SC_CLASS, err ? True : False, |
| 914 | wHI, wLO |
| 915 | ); |
| 916 | canonical->what = SsComplete; |
| 917 | |
sewardj | b5b8740 | 2011-03-07 16:05:35 +0000 | [diff] [blame] | 918 | # elif defined(VGP_s390x_linux) |
| 919 | VexGuestS390XState* gst = (VexGuestS390XState*)gst_vanilla; |
| 920 | canonical->sres = VG_(mk_SysRes_s390x_linux)( gst->guest_r2 ); |
| 921 | canonical->what = SsComplete; |
| 922 | |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 923 | # else |
| 924 | # error "getSyscallStatusFromGuestState: unknown arch" |
| 925 | # endif |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 926 | } |
| 927 | |
| 928 | static |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 929 | void putSyscallStatusIntoGuestState ( /*IN*/ ThreadId tid, |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 930 | /*IN*/ SyscallStatus* canonical, |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 931 | /*OUT*/VexGuestArchState* gst_vanilla ) |
| 932 | { |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 933 | # if defined(VGP_x86_linux) |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 934 | VexGuestX86State* gst = (VexGuestX86State*)gst_vanilla; |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 935 | vg_assert(canonical->what == SsComplete); |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 936 | if (sr_isError(canonical->sres)) { |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 937 | /* This isn't exactly right, in that really a Failure with res |
| 938 | not in the range 1 .. 4095 is unrepresentable in the |
| 939 | Linux-x86 scheme. Oh well. */ |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 940 | gst->guest_EAX = - (Int)sr_Err(canonical->sres); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 941 | } else { |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 942 | gst->guest_EAX = sr_Res(canonical->sres); |
sewardj | e7aa4ae | 2005-06-09 12:43:42 +0000 | [diff] [blame] | 943 | } |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 944 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 945 | OFFSET_x86_EAX, sizeof(UWord) ); |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 946 | |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 947 | # elif defined(VGP_amd64_linux) |
| 948 | VexGuestAMD64State* gst = (VexGuestAMD64State*)gst_vanilla; |
| 949 | vg_assert(canonical->what == SsComplete); |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 950 | if (sr_isError(canonical->sres)) { |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 951 | /* This isn't exactly right, in that really a Failure with res |
| 952 | not in the range 1 .. 4095 is unrepresentable in the |
sewardj | 59570ff | 2010-01-01 11:59:33 +0000 | [diff] [blame] | 953 | Linux-amd64 scheme. Oh well. */ |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 954 | gst->guest_RAX = - (Long)sr_Err(canonical->sres); |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 955 | } else { |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 956 | gst->guest_RAX = sr_Res(canonical->sres); |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 957 | } |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 958 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 959 | OFFSET_amd64_RAX, sizeof(UWord) ); |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 960 | |
| 961 | # elif defined(VGP_ppc32_linux) |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 962 | VexGuestPPC32State* gst = (VexGuestPPC32State*)gst_vanilla; |
sewardj | 463b3d9 | 2005-07-18 11:41:15 +0000 | [diff] [blame] | 963 | UInt old_cr = LibVEX_GuestPPC32_get_CR(gst); |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 964 | vg_assert(canonical->what == SsComplete); |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 965 | if (sr_isError(canonical->sres)) { |
sewardj | 463b3d9 | 2005-07-18 11:41:15 +0000 | [diff] [blame] | 966 | /* set CR0.SO */ |
| 967 | LibVEX_GuestPPC32_put_CR( old_cr | (1<<28), gst ); |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 968 | gst->guest_GPR3 = sr_Err(canonical->sres); |
sewardj | 463b3d9 | 2005-07-18 11:41:15 +0000 | [diff] [blame] | 969 | } else { |
| 970 | /* clear CR0.SO */ |
| 971 | LibVEX_GuestPPC32_put_CR( old_cr & ~(1<<28), gst ); |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 972 | gst->guest_GPR3 = sr_Res(canonical->sres); |
sewardj | 463b3d9 | 2005-07-18 11:41:15 +0000 | [diff] [blame] | 973 | } |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 974 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 975 | OFFSET_ppc32_GPR3, sizeof(UWord) ); |
| 976 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 977 | OFFSET_ppc32_CR0_0, sizeof(UChar) ); |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 978 | |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 979 | # elif defined(VGP_ppc64_linux) |
sewardj | 2c48c7b | 2005-11-29 13:05:56 +0000 | [diff] [blame] | 980 | VexGuestPPC64State* gst = (VexGuestPPC64State*)gst_vanilla; |
| 981 | UInt old_cr = LibVEX_GuestPPC64_get_CR(gst); |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 982 | vg_assert(canonical->what == SsComplete); |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 983 | if (sr_isError(canonical->sres)) { |
sewardj | 2c48c7b | 2005-11-29 13:05:56 +0000 | [diff] [blame] | 984 | /* set CR0.SO */ |
| 985 | LibVEX_GuestPPC64_put_CR( old_cr | (1<<28), gst ); |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 986 | gst->guest_GPR3 = sr_Err(canonical->sres); |
sewardj | 2c48c7b | 2005-11-29 13:05:56 +0000 | [diff] [blame] | 987 | } else { |
| 988 | /* clear CR0.SO */ |
| 989 | LibVEX_GuestPPC64_put_CR( old_cr & ~(1<<28), gst ); |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 990 | gst->guest_GPR3 = sr_Res(canonical->sres); |
sewardj | 2c48c7b | 2005-11-29 13:05:56 +0000 | [diff] [blame] | 991 | } |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 992 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 993 | OFFSET_ppc64_GPR3, sizeof(UWord) ); |
| 994 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 995 | OFFSET_ppc64_CR0_0, sizeof(UChar) ); |
sewardj | 2c48c7b | 2005-11-29 13:05:56 +0000 | [diff] [blame] | 996 | |
sewardj | 59570ff | 2010-01-01 11:59:33 +0000 | [diff] [blame] | 997 | # elif defined(VGP_arm_linux) |
| 998 | VexGuestARMState* gst = (VexGuestARMState*)gst_vanilla; |
| 999 | vg_assert(canonical->what == SsComplete); |
| 1000 | if (sr_isError(canonical->sres)) { |
| 1001 | /* This isn't exactly right, in that really a Failure with res |
| 1002 | not in the range 1 .. 4095 is unrepresentable in the |
| 1003 | Linux-arm scheme. Oh well. */ |
| 1004 | gst->guest_R0 = - (Int)sr_Err(canonical->sres); |
| 1005 | } else { |
| 1006 | gst->guest_R0 = sr_Res(canonical->sres); |
| 1007 | } |
| 1008 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 1009 | OFFSET_arm_R0, sizeof(UWord) ); |
| 1010 | |
sewardj | f0c1250 | 2014-01-12 12:54:00 +0000 | [diff] [blame] | 1011 | # elif defined(VGP_arm64_linux) |
| 1012 | VexGuestARM64State* gst = (VexGuestARM64State*)gst_vanilla; |
| 1013 | vg_assert(canonical->what == SsComplete); |
| 1014 | if (sr_isError(canonical->sres)) { |
| 1015 | /* This isn't exactly right, in that really a Failure with res |
| 1016 | not in the range 1 .. 4095 is unrepresentable in the |
| 1017 | Linux-arm64 scheme. Oh well. */ |
| 1018 | gst->guest_X0 = - (Long)sr_Err(canonical->sres); |
| 1019 | } else { |
| 1020 | gst->guest_X0 = sr_Res(canonical->sres); |
| 1021 | } |
| 1022 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 1023 | OFFSET_arm64_X0, sizeof(UWord) ); |
| 1024 | |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 1025 | #elif defined(VGP_x86_darwin) |
| 1026 | VexGuestX86State* gst = (VexGuestX86State*)gst_vanilla; |
| 1027 | SysRes sres = canonical->sres; |
| 1028 | vg_assert(canonical->what == SsComplete); |
| 1029 | /* Unfortunately here we have to break abstraction and look |
| 1030 | directly inside 'res', in order to decide what to do. */ |
| 1031 | switch (sres._mode) { |
| 1032 | case SysRes_MACH: // int $0x81 = Mach, 32-bit result |
| 1033 | case SysRes_MDEP: // int $0x82 = mdep, 32-bit result |
| 1034 | gst->guest_EAX = sres._wLO; |
| 1035 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 1036 | OFFSET_x86_EAX, sizeof(UInt) ); |
| 1037 | break; |
| 1038 | case SysRes_UNIX_OK: // int $0x80 = Unix, 64-bit result |
| 1039 | case SysRes_UNIX_ERR: // int $0x80 = Unix, 64-bit error |
| 1040 | gst->guest_EAX = sres._wLO; |
| 1041 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 1042 | OFFSET_x86_EAX, sizeof(UInt) ); |
| 1043 | gst->guest_EDX = sres._wHI; |
| 1044 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 1045 | OFFSET_x86_EDX, sizeof(UInt) ); |
| 1046 | LibVEX_GuestX86_put_eflag_c( sres._mode==SysRes_UNIX_ERR ? 1 : 0, |
| 1047 | gst ); |
| 1048 | // GrP fixme sets defined for entire eflags, not just bit c |
| 1049 | // DDD: this breaks exp-ptrcheck. |
| 1050 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 1051 | offsetof(VexGuestX86State, guest_CC_DEP1), sizeof(UInt) ); |
| 1052 | break; |
| 1053 | default: |
| 1054 | vg_assert(0); |
| 1055 | break; |
| 1056 | } |
| 1057 | |
| 1058 | #elif defined(VGP_amd64_darwin) |
| 1059 | VexGuestAMD64State* gst = (VexGuestAMD64State*)gst_vanilla; |
| 1060 | SysRes sres = canonical->sres; |
| 1061 | vg_assert(canonical->what == SsComplete); |
| 1062 | /* Unfortunately here we have to break abstraction and look |
| 1063 | directly inside 'res', in order to decide what to do. */ |
| 1064 | switch (sres._mode) { |
| 1065 | case SysRes_MACH: // syscall = Mach, 64-bit result |
| 1066 | case SysRes_MDEP: // syscall = mdep, 64-bit result |
| 1067 | gst->guest_RAX = sres._wLO; |
| 1068 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 1069 | OFFSET_amd64_RAX, sizeof(ULong) ); |
| 1070 | break; |
| 1071 | case SysRes_UNIX_OK: // syscall = Unix, 128-bit result |
| 1072 | case SysRes_UNIX_ERR: // syscall = Unix, 128-bit error |
| 1073 | gst->guest_RAX = sres._wLO; |
| 1074 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 1075 | OFFSET_amd64_RAX, sizeof(ULong) ); |
| 1076 | gst->guest_RDX = sres._wHI; |
| 1077 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 1078 | OFFSET_amd64_RDX, sizeof(ULong) ); |
| 1079 | LibVEX_GuestAMD64_put_rflag_c( sres._mode==SysRes_UNIX_ERR ? 1 : 0, |
| 1080 | gst ); |
| 1081 | // GrP fixme sets defined for entire rflags, not just bit c |
| 1082 | // DDD: this breaks exp-ptrcheck. |
| 1083 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 1084 | offsetof(VexGuestAMD64State, guest_CC_DEP1), sizeof(ULong) ); |
| 1085 | break; |
| 1086 | default: |
| 1087 | vg_assert(0); |
| 1088 | break; |
| 1089 | } |
| 1090 | |
sewardj | b5b8740 | 2011-03-07 16:05:35 +0000 | [diff] [blame] | 1091 | # elif defined(VGP_s390x_linux) |
| 1092 | VexGuestS390XState* gst = (VexGuestS390XState*)gst_vanilla; |
| 1093 | vg_assert(canonical->what == SsComplete); |
| 1094 | if (sr_isError(canonical->sres)) { |
| 1095 | gst->guest_r2 = - (Long)sr_Err(canonical->sres); |
| 1096 | } else { |
| 1097 | gst->guest_r2 = sr_Res(canonical->sres); |
| 1098 | } |
| 1099 | |
sewardj | 5db1540 | 2012-06-07 09:13:21 +0000 | [diff] [blame] | 1100 | # elif defined(VGP_mips32_linux) |
| 1101 | VexGuestMIPS32State* gst = (VexGuestMIPS32State*)gst_vanilla; |
| 1102 | vg_assert(canonical->what == SsComplete); |
| 1103 | if (sr_isError(canonical->sres)) { |
| 1104 | gst->guest_r2 = (Int)sr_Err(canonical->sres); |
| 1105 | gst->guest_r7 = (Int)sr_Err(canonical->sres); |
| 1106 | } else { |
| 1107 | gst->guest_r2 = sr_Res(canonical->sres); |
| 1108 | gst->guest_r3 = sr_ResEx(canonical->sres); |
| 1109 | gst->guest_r7 = (Int)sr_Err(canonical->sres); |
| 1110 | } |
| 1111 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 1112 | OFFSET_mips32_r2, sizeof(UWord) ); |
| 1113 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 1114 | OFFSET_mips32_r3, sizeof(UWord) ); |
| 1115 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 1116 | OFFSET_mips32_r7, sizeof(UWord) ); |
| 1117 | |
petarj | 4df0bfc | 2013-02-27 23:17:33 +0000 | [diff] [blame] | 1118 | # elif defined(VGP_mips64_linux) |
| 1119 | VexGuestMIPS64State* gst = (VexGuestMIPS64State*)gst_vanilla; |
| 1120 | vg_assert(canonical->what == SsComplete); |
| 1121 | if (sr_isError(canonical->sres)) { |
| 1122 | gst->guest_r2 = (Int)sr_Err(canonical->sres); |
| 1123 | gst->guest_r7 = (Int)sr_Err(canonical->sres); |
| 1124 | } else { |
| 1125 | gst->guest_r2 = sr_Res(canonical->sres); |
| 1126 | gst->guest_r3 = sr_ResEx(canonical->sres); |
| 1127 | gst->guest_r7 = (Int)sr_Err(canonical->sres); |
| 1128 | } |
| 1129 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 1130 | OFFSET_mips64_r2, sizeof(UWord) ); |
| 1131 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 1132 | OFFSET_mips64_r3, sizeof(UWord) ); |
| 1133 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 1134 | OFFSET_mips64_r7, sizeof(UWord) ); |
| 1135 | |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 1136 | # else |
| 1137 | # error "putSyscallStatusIntoGuestState: unknown arch" |
| 1138 | # endif |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1139 | } |
| 1140 | |
| 1141 | |
| 1142 | /* Tell me the offsets in the guest state of the syscall params, so |
| 1143 | that the scalar argument checkers don't have to have this info |
| 1144 | hardwired. */ |
| 1145 | |
| 1146 | static |
| 1147 | void getSyscallArgLayout ( /*OUT*/SyscallArgLayout* layout ) |
| 1148 | { |
sewardj | f0c1250 | 2014-01-12 12:54:00 +0000 | [diff] [blame] | 1149 | VG_(bzero_inline)(layout, sizeof(*layout)); |
| 1150 | |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 1151 | #if defined(VGP_x86_linux) |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1152 | layout->o_sysno = OFFSET_x86_EAX; |
| 1153 | layout->o_arg1 = OFFSET_x86_EBX; |
| 1154 | layout->o_arg2 = OFFSET_x86_ECX; |
| 1155 | layout->o_arg3 = OFFSET_x86_EDX; |
| 1156 | layout->o_arg4 = OFFSET_x86_ESI; |
| 1157 | layout->o_arg5 = OFFSET_x86_EDI; |
| 1158 | layout->o_arg6 = OFFSET_x86_EBP; |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 1159 | layout->uu_arg7 = -1; /* impossible value */ |
| 1160 | layout->uu_arg8 = -1; /* impossible value */ |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 1161 | |
| 1162 | #elif defined(VGP_amd64_linux) |
sewardj | e7aa4ae | 2005-06-09 12:43:42 +0000 | [diff] [blame] | 1163 | layout->o_sysno = OFFSET_amd64_RAX; |
| 1164 | layout->o_arg1 = OFFSET_amd64_RDI; |
| 1165 | layout->o_arg2 = OFFSET_amd64_RSI; |
| 1166 | layout->o_arg3 = OFFSET_amd64_RDX; |
| 1167 | layout->o_arg4 = OFFSET_amd64_R10; |
| 1168 | layout->o_arg5 = OFFSET_amd64_R8; |
| 1169 | layout->o_arg6 = OFFSET_amd64_R9; |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 1170 | layout->uu_arg7 = -1; /* impossible value */ |
| 1171 | layout->uu_arg8 = -1; /* impossible value */ |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 1172 | |
| 1173 | #elif defined(VGP_ppc32_linux) |
| 1174 | layout->o_sysno = OFFSET_ppc32_GPR0; |
| 1175 | layout->o_arg1 = OFFSET_ppc32_GPR3; |
| 1176 | layout->o_arg2 = OFFSET_ppc32_GPR4; |
| 1177 | layout->o_arg3 = OFFSET_ppc32_GPR5; |
| 1178 | layout->o_arg4 = OFFSET_ppc32_GPR6; |
| 1179 | layout->o_arg5 = OFFSET_ppc32_GPR7; |
| 1180 | layout->o_arg6 = OFFSET_ppc32_GPR8; |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 1181 | layout->uu_arg7 = -1; /* impossible value */ |
| 1182 | layout->uu_arg8 = -1; /* impossible value */ |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 1183 | |
sewardj | 2c48c7b | 2005-11-29 13:05:56 +0000 | [diff] [blame] | 1184 | #elif defined(VGP_ppc64_linux) |
| 1185 | layout->o_sysno = OFFSET_ppc64_GPR0; |
| 1186 | layout->o_arg1 = OFFSET_ppc64_GPR3; |
| 1187 | layout->o_arg2 = OFFSET_ppc64_GPR4; |
| 1188 | layout->o_arg3 = OFFSET_ppc64_GPR5; |
| 1189 | layout->o_arg4 = OFFSET_ppc64_GPR6; |
| 1190 | layout->o_arg5 = OFFSET_ppc64_GPR7; |
| 1191 | layout->o_arg6 = OFFSET_ppc64_GPR8; |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 1192 | layout->uu_arg7 = -1; /* impossible value */ |
| 1193 | layout->uu_arg8 = -1; /* impossible value */ |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 1194 | |
sewardj | 59570ff | 2010-01-01 11:59:33 +0000 | [diff] [blame] | 1195 | #elif defined(VGP_arm_linux) |
| 1196 | layout->o_sysno = OFFSET_arm_R7; |
| 1197 | layout->o_arg1 = OFFSET_arm_R0; |
| 1198 | layout->o_arg2 = OFFSET_arm_R1; |
| 1199 | layout->o_arg3 = OFFSET_arm_R2; |
| 1200 | layout->o_arg4 = OFFSET_arm_R3; |
| 1201 | layout->o_arg5 = OFFSET_arm_R4; |
| 1202 | layout->o_arg6 = OFFSET_arm_R5; |
| 1203 | layout->uu_arg7 = -1; /* impossible value */ |
| 1204 | layout->uu_arg8 = -1; /* impossible value */ |
| 1205 | |
sewardj | f0c1250 | 2014-01-12 12:54:00 +0000 | [diff] [blame] | 1206 | #elif defined(VGP_arm64_linux) |
| 1207 | layout->o_sysno = OFFSET_arm64_X8; |
| 1208 | layout->o_arg1 = OFFSET_arm64_X0; |
| 1209 | layout->o_arg2 = OFFSET_arm64_X1; |
| 1210 | layout->o_arg3 = OFFSET_arm64_X2; |
| 1211 | layout->o_arg4 = OFFSET_arm64_X3; |
| 1212 | layout->o_arg5 = OFFSET_arm64_X4; |
| 1213 | layout->o_arg6 = OFFSET_arm64_X5; |
| 1214 | layout->uu_arg7 = -1; /* impossible value */ |
| 1215 | layout->uu_arg8 = -1; /* impossible value */ |
| 1216 | |
sewardj | 5db1540 | 2012-06-07 09:13:21 +0000 | [diff] [blame] | 1217 | #elif defined(VGP_mips32_linux) |
| 1218 | layout->o_sysno = OFFSET_mips32_r2; |
| 1219 | layout->o_arg1 = OFFSET_mips32_r4; |
| 1220 | layout->o_arg2 = OFFSET_mips32_r5; |
| 1221 | layout->o_arg3 = OFFSET_mips32_r6; |
| 1222 | layout->o_arg4 = OFFSET_mips32_r7; |
| 1223 | layout->s_arg5 = sizeof(UWord) * 4; |
| 1224 | layout->s_arg6 = sizeof(UWord) * 5; |
| 1225 | layout->uu_arg7 = -1; /* impossible value */ |
| 1226 | layout->uu_arg8 = -1; /* impossible value */ |
| 1227 | |
petarj | 4df0bfc | 2013-02-27 23:17:33 +0000 | [diff] [blame] | 1228 | #elif defined(VGP_mips64_linux) |
| 1229 | layout->o_sysno = OFFSET_mips64_r2; |
| 1230 | layout->o_arg1 = OFFSET_mips64_r4; |
| 1231 | layout->o_arg2 = OFFSET_mips64_r5; |
| 1232 | layout->o_arg3 = OFFSET_mips64_r6; |
| 1233 | layout->o_arg4 = OFFSET_mips64_r7; |
| 1234 | layout->o_arg5 = OFFSET_mips64_r8; |
| 1235 | layout->o_arg6 = OFFSET_mips64_r9; |
| 1236 | layout->uu_arg7 = -1; /* impossible value */ |
| 1237 | layout->uu_arg8 = -1; /* impossible value */ |
| 1238 | |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 1239 | #elif defined(VGP_x86_darwin) |
| 1240 | layout->o_sysno = OFFSET_x86_EAX; |
| 1241 | // syscall parameters are on stack in C convention |
| 1242 | layout->s_arg1 = sizeof(UWord) * 1; |
| 1243 | layout->s_arg2 = sizeof(UWord) * 2; |
| 1244 | layout->s_arg3 = sizeof(UWord) * 3; |
| 1245 | layout->s_arg4 = sizeof(UWord) * 4; |
| 1246 | layout->s_arg5 = sizeof(UWord) * 5; |
| 1247 | layout->s_arg6 = sizeof(UWord) * 6; |
| 1248 | layout->s_arg7 = sizeof(UWord) * 7; |
| 1249 | layout->s_arg8 = sizeof(UWord) * 8; |
| 1250 | |
| 1251 | #elif defined(VGP_amd64_darwin) |
| 1252 | layout->o_sysno = OFFSET_amd64_RAX; |
| 1253 | layout->o_arg1 = OFFSET_amd64_RDI; |
| 1254 | layout->o_arg2 = OFFSET_amd64_RSI; |
| 1255 | layout->o_arg3 = OFFSET_amd64_RDX; |
| 1256 | layout->o_arg4 = OFFSET_amd64_RCX; |
| 1257 | layout->o_arg5 = OFFSET_amd64_R8; |
| 1258 | layout->o_arg6 = OFFSET_amd64_R9; |
| 1259 | layout->s_arg7 = sizeof(UWord) * 1; |
| 1260 | layout->s_arg8 = sizeof(UWord) * 2; |
| 1261 | |
sewardj | b5b8740 | 2011-03-07 16:05:35 +0000 | [diff] [blame] | 1262 | #elif defined(VGP_s390x_linux) |
| 1263 | layout->o_sysno = OFFSET_s390x_SYSNO; |
| 1264 | layout->o_arg1 = OFFSET_s390x_r2; |
| 1265 | layout->o_arg2 = OFFSET_s390x_r3; |
| 1266 | layout->o_arg3 = OFFSET_s390x_r4; |
| 1267 | layout->o_arg4 = OFFSET_s390x_r5; |
| 1268 | layout->o_arg5 = OFFSET_s390x_r6; |
| 1269 | layout->o_arg6 = OFFSET_s390x_r7; |
| 1270 | layout->uu_arg7 = -1; /* impossible value */ |
| 1271 | layout->uu_arg8 = -1; /* impossible value */ |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 1272 | #else |
| 1273 | # error "getSyscallLayout: unknown arch" |
| 1274 | #endif |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1275 | } |
| 1276 | |
| 1277 | |
| 1278 | /* --------------------------------------------------------------------- |
| 1279 | The main driver logic |
| 1280 | ------------------------------------------------------------------ */ |
| 1281 | |
| 1282 | /* Finding the handlers for a given syscall, or faking up one |
| 1283 | when no handler is found. */ |
| 1284 | |
| 1285 | static |
| 1286 | void bad_before ( ThreadId tid, |
| 1287 | SyscallArgLayout* layout, |
| 1288 | /*MOD*/SyscallArgs* args, |
| 1289 | /*OUT*/SyscallStatus* status, |
| 1290 | /*OUT*/UWord* flags ) |
| 1291 | { |
sewardj | 738856f | 2009-07-15 14:48:32 +0000 | [diff] [blame] | 1292 | VG_(dmsg)("WARNING: unhandled syscall: %s\n", |
njn | 1a1e95c | 2009-06-03 06:50:06 +0000 | [diff] [blame] | 1293 | VG_SYSNUM_STRING_EXTRA(args->sysno)); |
njn | 12b9424 | 2009-06-03 07:17:07 +0000 | [diff] [blame] | 1294 | if (VG_(clo_verbosity) > 1) { |
| 1295 | VG_(get_and_pp_StackTrace)(tid, VG_(clo_backtrace_size)); |
| 1296 | } |
sewardj | 738856f | 2009-07-15 14:48:32 +0000 | [diff] [blame] | 1297 | VG_(dmsg)("You may be able to write your own handler.\n"); |
| 1298 | VG_(dmsg)("Read the file README_MISSING_SYSCALL_OR_IOCTL.\n"); |
| 1299 | VG_(dmsg)("Nevertheless we consider this a bug. Please report\n"); |
| 1300 | VG_(dmsg)("it at http://valgrind.org/support/bug_reports.html.\n"); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1301 | |
| 1302 | SET_STATUS_Failure(VKI_ENOSYS); |
| 1303 | } |
| 1304 | |
| 1305 | static SyscallTableEntry bad_sys = |
| 1306 | { bad_before, NULL }; |
| 1307 | |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 1308 | static const SyscallTableEntry* get_syscall_entry ( Int syscallno ) |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1309 | { |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 1310 | const SyscallTableEntry* sys = NULL; |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1311 | |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 1312 | # if defined(VGO_linux) |
sewardj | 59570ff | 2010-01-01 11:59:33 +0000 | [diff] [blame] | 1313 | sys = ML_(get_linux_syscall_entry)( syscallno ); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1314 | |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 1315 | # elif defined(VGO_darwin) |
| 1316 | Int idx = VG_DARWIN_SYSNO_INDEX(syscallno); |
| 1317 | |
| 1318 | switch (VG_DARWIN_SYSNO_CLASS(syscallno)) { |
| 1319 | case VG_DARWIN_SYSCALL_CLASS_UNIX: |
| 1320 | if (idx >= 0 && idx < ML_(syscall_table_size) && |
| 1321 | ML_(syscall_table)[idx].before != NULL) |
| 1322 | sys = &ML_(syscall_table)[idx]; |
| 1323 | break; |
| 1324 | case VG_DARWIN_SYSCALL_CLASS_MACH: |
| 1325 | if (idx >= 0 && idx < ML_(mach_trap_table_size) && |
| 1326 | ML_(mach_trap_table)[idx].before != NULL) |
| 1327 | sys = &ML_(mach_trap_table)[idx]; |
| 1328 | break; |
| 1329 | case VG_DARWIN_SYSCALL_CLASS_MDEP: |
| 1330 | if (idx >= 0 && idx < ML_(mdep_trap_table_size) && |
| 1331 | ML_(mdep_trap_table)[idx].before != NULL) |
| 1332 | sys = &ML_(mdep_trap_table)[idx]; |
| 1333 | break; |
| 1334 | default: |
| 1335 | vg_assert(0); |
| 1336 | break; |
| 1337 | } |
| 1338 | |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 1339 | # else |
| 1340 | # error Unknown OS |
| 1341 | # endif |
| 1342 | |
| 1343 | return sys == NULL ? &bad_sys : sys; |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1344 | } |
| 1345 | |
| 1346 | |
| 1347 | /* Add and remove signals from mask so that we end up telling the |
| 1348 | kernel the state we actually want rather than what the client |
| 1349 | wants. */ |
njn | 1dcee09 | 2009-02-24 03:07:37 +0000 | [diff] [blame] | 1350 | static void sanitize_client_sigmask(vki_sigset_t *mask) |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1351 | { |
| 1352 | VG_(sigdelset)(mask, VKI_SIGKILL); |
| 1353 | VG_(sigdelset)(mask, VKI_SIGSTOP); |
njn | 351d006 | 2005-06-21 22:23:59 +0000 | [diff] [blame] | 1354 | VG_(sigdelset)(mask, VG_SIGVGKILL); /* never block */ |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1355 | } |
| 1356 | |
| 1357 | typedef |
| 1358 | struct { |
| 1359 | SyscallArgs orig_args; |
| 1360 | SyscallArgs args; |
| 1361 | SyscallStatus status; |
| 1362 | UWord flags; |
| 1363 | } |
| 1364 | SyscallInfo; |
| 1365 | |
| 1366 | SyscallInfo syscallInfo[VG_N_THREADS]; |
| 1367 | |
| 1368 | |
| 1369 | /* The scheduler needs to be able to zero out these records after a |
njn | c1b0181 | 2005-06-17 22:19:06 +0000 | [diff] [blame] | 1370 | fork, hence this is exported from m_syswrap. */ |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1371 | void VG_(clear_syscallInfo) ( Int tid ) |
| 1372 | { |
| 1373 | vg_assert(tid >= 0 && tid < VG_N_THREADS); |
| 1374 | VG_(memset)( & syscallInfo[tid], 0, sizeof( syscallInfo[tid] )); |
| 1375 | syscallInfo[tid].status.what = SsIdle; |
| 1376 | } |
| 1377 | |
| 1378 | static void ensure_initialised ( void ) |
| 1379 | { |
| 1380 | Int i; |
| 1381 | static Bool init_done = False; |
| 1382 | if (init_done) |
| 1383 | return; |
| 1384 | init_done = True; |
| 1385 | for (i = 0; i < VG_N_THREADS; i++) { |
| 1386 | VG_(clear_syscallInfo)( i ); |
| 1387 | } |
| 1388 | } |
| 1389 | |
| 1390 | /* --- This is the main function of this file. --- */ |
| 1391 | |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 1392 | void VG_(client_syscall) ( ThreadId tid, UInt trc ) |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1393 | { |
njn | 6dad504 | 2009-05-20 05:22:38 +0000 | [diff] [blame] | 1394 | Word sysno; |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1395 | ThreadState* tst; |
| 1396 | const SyscallTableEntry* ent; |
| 1397 | SyscallArgLayout layout; |
| 1398 | SyscallInfo* sci; |
| 1399 | |
| 1400 | ensure_initialised(); |
| 1401 | |
| 1402 | vg_assert(VG_(is_valid_tid)(tid)); |
| 1403 | vg_assert(tid >= 1 && tid < VG_N_THREADS); |
| 1404 | vg_assert(VG_(is_running_thread)(tid)); |
| 1405 | |
| 1406 | tst = VG_(get_ThreadState)(tid); |
| 1407 | |
sewardj | 2547532 | 2008-10-27 01:23:04 +0000 | [diff] [blame] | 1408 | /* BEGIN ensure root thread's stack is suitably mapped */ |
| 1409 | /* In some rare circumstances, we may do the syscall without the |
| 1410 | bottom page of the stack being mapped, because the stack pointer |
| 1411 | was moved down just a few instructions before the syscall |
| 1412 | instruction, and there have been no memory references since |
| 1413 | then, that would cause a call to VG_(extend_stack) to have |
| 1414 | happened. |
| 1415 | |
| 1416 | In native execution that's OK: the kernel automagically extends |
| 1417 | the stack's mapped area down to cover the stack pointer (or sp - |
| 1418 | redzone, really). In simulated normal execution that's OK too, |
| 1419 | since any signals we get from accessing below the mapped area of |
| 1420 | the (guest's) stack lead us to VG_(extend_stack), where we |
| 1421 | simulate the kernel's stack extension logic. But that leaves |
| 1422 | the problem of entering a syscall with the SP unmapped. Because |
| 1423 | the kernel doesn't know that the segment immediately above SP is |
| 1424 | supposed to be a grow-down segment, it causes the syscall to |
| 1425 | fail, and thereby causes a divergence between native behaviour |
| 1426 | (syscall succeeds) and simulated behaviour (syscall fails). |
| 1427 | |
| 1428 | This is quite a rare failure mode. It has only been seen |
| 1429 | affecting calls to sys_readlink on amd64-linux, and even then it |
| 1430 | requires a certain code sequence around the syscall to trigger |
| 1431 | it. Here is one: |
| 1432 | |
| 1433 | extern int my_readlink ( const char* path ); |
| 1434 | asm( |
| 1435 | ".text\n" |
| 1436 | ".globl my_readlink\n" |
| 1437 | "my_readlink:\n" |
| 1438 | "\tsubq $0x1008,%rsp\n" |
| 1439 | "\tmovq %rdi,%rdi\n" // path is in rdi |
| 1440 | "\tmovq %rsp,%rsi\n" // &buf[0] -> rsi |
| 1441 | "\tmovl $0x1000,%edx\n" // sizeof(buf) in rdx |
| 1442 | "\tmovl $"__NR_READLINK",%eax\n" // syscall number |
| 1443 | "\tsyscall\n" |
| 1444 | "\taddq $0x1008,%rsp\n" |
| 1445 | "\tret\n" |
| 1446 | ".previous\n" |
| 1447 | ); |
| 1448 | |
| 1449 | For more details, see bug #156404 |
| 1450 | (https://bugs.kde.org/show_bug.cgi?id=156404). |
| 1451 | |
| 1452 | The fix is actually very simple. We simply need to call |
| 1453 | VG_(extend_stack) for this thread, handing it the lowest |
| 1454 | possible valid address for stack (sp - redzone), to ensure the |
| 1455 | pages all the way down to that address, are mapped. Because |
| 1456 | this is a potentially expensive and frequent operation, we |
| 1457 | filter in two ways: |
| 1458 | |
| 1459 | First, only the main thread (tid=1) has a growdown stack. So |
| 1460 | ignore all others. It is conceivable, although highly unlikely, |
| 1461 | that the main thread exits, and later another thread is |
| 1462 | allocated tid=1, but that's harmless, I believe; |
| 1463 | VG_(extend_stack) will do nothing when applied to a non-root |
| 1464 | thread. |
| 1465 | |
| 1466 | Secondly, first call VG_(am_find_nsegment) directly, to see if |
| 1467 | the page holding (sp - redzone) is mapped correctly. If so, do |
| 1468 | nothing. This is almost always the case. VG_(extend_stack) |
| 1469 | calls VG_(am_find_nsegment) twice, so this optimisation -- and |
| 1470 | that's all it is -- more or less halves the number of calls to |
| 1471 | VG_(am_find_nsegment) required. |
| 1472 | |
| 1473 | TODO: the test "seg->kind == SkAnonC" is really inadequate, |
| 1474 | because although it tests whether the segment is mapped |
| 1475 | _somehow_, it doesn't check that it has the right permissions |
| 1476 | (r,w, maybe x) ? We could test that here, but it will also be |
| 1477 | necessary to fix the corresponding test in VG_(extend_stack). |
| 1478 | |
| 1479 | All this guff is of course Linux-specific. Hence the ifdef. |
| 1480 | */ |
| 1481 | # if defined(VGO_linux) |
| 1482 | if (tid == 1/*ROOT THREAD*/) { |
| 1483 | Addr stackMin = VG_(get_SP)(tid) - VG_STACK_REDZONE_SZB; |
| 1484 | NSegment const* seg = VG_(am_find_nsegment)(stackMin); |
| 1485 | if (seg && seg->kind == SkAnonC) { |
| 1486 | /* stackMin is already mapped. Nothing to do. */ |
| 1487 | } else { |
| 1488 | (void)VG_(extend_stack)( stackMin, |
| 1489 | tst->client_stack_szB ); |
| 1490 | } |
| 1491 | } |
| 1492 | # endif |
| 1493 | /* END ensure root thread's stack is suitably mapped */ |
| 1494 | |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1495 | /* First off, get the syscall args and number. This is a |
| 1496 | platform-dependent action. */ |
| 1497 | |
| 1498 | sci = & syscallInfo[tid]; |
| 1499 | vg_assert(sci->status.what == SsIdle); |
| 1500 | |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 1501 | getSyscallArgsFromGuestState( &sci->orig_args, &tst->arch.vex, trc ); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1502 | |
| 1503 | /* Copy .orig_args to .args. The pre-handler may modify .args, but |
| 1504 | we want to keep the originals too, just in case. */ |
| 1505 | sci->args = sci->orig_args; |
| 1506 | |
| 1507 | /* Save the syscall number in the thread state in case the syscall |
| 1508 | is interrupted by a signal. */ |
| 1509 | sysno = sci->orig_args.sysno; |
| 1510 | |
sewardj | fe7fd4b | 2011-06-15 15:11:50 +0000 | [diff] [blame] | 1511 | /* It's sometimes useful, as a crude debugging hack, to get a |
| 1512 | stack trace at each (or selected) syscalls. */ |
sewardj | 27a4db0 | 2011-09-26 20:16:15 +0000 | [diff] [blame] | 1513 | if (0 && sysno == __NR_ioctl) { |
| 1514 | VG_(umsg)("\nioctl:\n"); |
sewardj | fe7fd4b | 2011-06-15 15:11:50 +0000 | [diff] [blame] | 1515 | VG_(get_and_pp_StackTrace)(tid, 10); |
sewardj | 27a4db0 | 2011-09-26 20:16:15 +0000 | [diff] [blame] | 1516 | VG_(umsg)("\n"); |
sewardj | fe7fd4b | 2011-06-15 15:11:50 +0000 | [diff] [blame] | 1517 | } |
| 1518 | |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 1519 | # if defined(VGO_darwin) |
| 1520 | /* Record syscall class. But why? Because the syscall might be |
| 1521 | interrupted by a signal, and in the signal handler (which will |
| 1522 | be m_signals.async_signalhandler) we will need to build a SysRes |
| 1523 | reflecting the syscall return result. In order to do that we |
| 1524 | need to know the syscall class. Hence stash it in the guest |
sewardj | 6e9de46 | 2011-06-28 07:25:29 +0000 | [diff] [blame] | 1525 | state of this thread. This madness is not needed on Linux |
| 1526 | because it only has a single syscall return convention and so |
| 1527 | there is no ambiguity involved in converting the post-signal |
| 1528 | machine state into a SysRes. */ |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 1529 | tst->arch.vex.guest_SC_CLASS = VG_DARWIN_SYSNO_CLASS(sysno); |
| 1530 | # endif |
| 1531 | |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1532 | /* The default what-to-do-next thing is hand the syscall to the |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 1533 | kernel, so we pre-set that here. Set .sres to something |
| 1534 | harmless looking (is irrelevant because .what is not |
| 1535 | SsComplete.) */ |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1536 | sci->status.what = SsHandToKernel; |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 1537 | sci->status.sres = VG_(mk_SysRes_Error)(0); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1538 | sci->flags = 0; |
| 1539 | |
| 1540 | /* Fetch the syscall's handlers. If no handlers exist for this |
| 1541 | syscall, we are given dummy handlers which force an immediate |
| 1542 | return with ENOSYS. */ |
| 1543 | ent = get_syscall_entry(sysno); |
| 1544 | |
| 1545 | /* Fetch the layout information, which tells us where in the guest |
| 1546 | state the syscall args reside. This is a platform-dependent |
| 1547 | action. This info is needed so that the scalar syscall argument |
| 1548 | checks (PRE_REG_READ calls) know which bits of the guest state |
| 1549 | they need to inspect. */ |
| 1550 | getSyscallArgLayout( &layout ); |
| 1551 | |
| 1552 | /* Make sure the tmp signal mask matches the real signal mask; |
| 1553 | sigsuspend may change this. */ |
| 1554 | vg_assert(VG_(iseqsigset)(&tst->sig_mask, &tst->tmp_sig_mask)); |
| 1555 | |
| 1556 | /* Right, we're finally ready to Party. Call the pre-handler and |
| 1557 | see what we get back. At this point: |
| 1558 | |
| 1559 | sci->status.what is Unset (we don't know yet). |
| 1560 | sci->orig_args contains the original args. |
| 1561 | sci->args is the same as sci->orig_args. |
| 1562 | sci->flags is zero. |
| 1563 | */ |
| 1564 | |
njn | 1a1e95c | 2009-06-03 06:50:06 +0000 | [diff] [blame] | 1565 | PRINT("SYSCALL[%d,%d](%s) ", |
| 1566 | VG_(getpid)(), tid, VG_SYSNUM_STRING(sysno)); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1567 | |
| 1568 | /* Do any pre-syscall actions */ |
| 1569 | if (VG_(needs).syscall_wrapper) { |
sewardj | 1c0ce7a | 2009-07-01 08:10:49 +0000 | [diff] [blame] | 1570 | UWord tmpv[8]; |
| 1571 | tmpv[0] = sci->orig_args.arg1; |
| 1572 | tmpv[1] = sci->orig_args.arg2; |
| 1573 | tmpv[2] = sci->orig_args.arg3; |
| 1574 | tmpv[3] = sci->orig_args.arg4; |
| 1575 | tmpv[4] = sci->orig_args.arg5; |
| 1576 | tmpv[5] = sci->orig_args.arg6; |
| 1577 | tmpv[6] = sci->orig_args.arg7; |
| 1578 | tmpv[7] = sci->orig_args.arg8; |
| 1579 | VG_TDICT_CALL(tool_pre_syscall, tid, sysno, |
| 1580 | &tmpv[0], sizeof(tmpv)/sizeof(tmpv[0])); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1581 | } |
| 1582 | |
| 1583 | vg_assert(ent); |
| 1584 | vg_assert(ent->before); |
| 1585 | (ent->before)( tid, |
| 1586 | &layout, |
| 1587 | &sci->args, &sci->status, &sci->flags ); |
| 1588 | |
| 1589 | /* The pre-handler may have modified: |
| 1590 | sci->args |
| 1591 | sci->status |
| 1592 | sci->flags |
| 1593 | All else remains unchanged. |
| 1594 | Although the args may be modified, pre handlers are not allowed |
| 1595 | to change the syscall number. |
| 1596 | */ |
| 1597 | /* Now we proceed according to what the pre-handler decided. */ |
| 1598 | vg_assert(sci->status.what == SsHandToKernel |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 1599 | || sci->status.what == SsComplete); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1600 | vg_assert(sci->args.sysno == sci->orig_args.sysno); |
| 1601 | |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 1602 | if (sci->status.what == SsComplete && !sr_isError(sci->status.sres)) { |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1603 | /* The pre-handler completed the syscall itself, declaring |
| 1604 | success. */ |
sewardj | 1829053 | 2007-03-19 13:38:11 +0000 | [diff] [blame] | 1605 | if (sci->flags & SfNoWriteResult) { |
njn | 3373755 | 2009-05-20 05:19:22 +0000 | [diff] [blame] | 1606 | PRINT(" --> [pre-success] NoWriteResult"); |
sewardj | 1829053 | 2007-03-19 13:38:11 +0000 | [diff] [blame] | 1607 | } else { |
njn | 3373755 | 2009-05-20 05:19:22 +0000 | [diff] [blame] | 1608 | PRINT(" --> [pre-success] Success(0x%llx:0x%llx)", |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 1609 | (ULong)sr_ResHI(sci->status.sres), |
| 1610 | (ULong)sr_Res(sci->status.sres)); |
sewardj | 1829053 | 2007-03-19 13:38:11 +0000 | [diff] [blame] | 1611 | } |
sewardj | 45f4e7c | 2005-09-27 19:20:21 +0000 | [diff] [blame] | 1612 | /* In this case the allowable flags are to ask for a signal-poll |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1613 | and/or a yield after the call. Changing the args isn't |
| 1614 | allowed. */ |
sewardj | 1829053 | 2007-03-19 13:38:11 +0000 | [diff] [blame] | 1615 | vg_assert(0 == (sci->flags |
| 1616 | & ~(SfPollAfter | SfYieldAfter | SfNoWriteResult))); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1617 | vg_assert(eq_SyscallArgs(&sci->args, &sci->orig_args)); |
| 1618 | } |
| 1619 | |
| 1620 | else |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 1621 | if (sci->status.what == SsComplete && sr_isError(sci->status.sres)) { |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1622 | /* The pre-handler decided to fail syscall itself. */ |
njn | 3373755 | 2009-05-20 05:19:22 +0000 | [diff] [blame] | 1623 | PRINT(" --> [pre-fail] Failure(0x%llx)", (ULong)sr_Err(sci->status.sres)); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1624 | /* In this case, the pre-handler is also allowed to ask for the |
| 1625 | post-handler to be run anyway. Changing the args is not |
| 1626 | allowed. */ |
| 1627 | vg_assert(0 == (sci->flags & ~(SfMayBlock | SfPostOnFail | SfPollAfter))); |
| 1628 | vg_assert(eq_SyscallArgs(&sci->args, &sci->orig_args)); |
| 1629 | } |
| 1630 | |
| 1631 | else |
| 1632 | if (sci->status.what != SsHandToKernel) { |
| 1633 | /* huh?! */ |
| 1634 | vg_assert(0); |
| 1635 | } |
| 1636 | |
| 1637 | else /* (sci->status.what == HandToKernel) */ { |
| 1638 | /* Ok, this is the usual case -- and the complicated one. There |
| 1639 | are two subcases: sync and async. async is the general case |
| 1640 | and is to be used when there is any possibility that the |
| 1641 | syscall might block [a fact that the pre-handler must tell us |
| 1642 | via the sci->flags field.] Because the tidying-away / |
| 1643 | context-switch overhead of the async case could be large, if |
| 1644 | we are sure that the syscall will not block, we fast-track it |
| 1645 | by doing it directly in this thread, which is a lot |
| 1646 | simpler. */ |
| 1647 | |
sewardj | d6e91bc | 2005-11-17 14:26:52 +0000 | [diff] [blame] | 1648 | /* Check that the given flags are allowable: MayBlock, PollAfter |
| 1649 | and PostOnFail are ok. */ |
| 1650 | vg_assert(0 == (sci->flags & ~(SfMayBlock | SfPostOnFail | SfPollAfter))); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1651 | |
| 1652 | if (sci->flags & SfMayBlock) { |
| 1653 | |
| 1654 | /* Syscall may block, so run it asynchronously */ |
| 1655 | vki_sigset_t mask; |
| 1656 | |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1657 | PRINT(" --> [async] ... \n"); |
| 1658 | |
| 1659 | mask = tst->sig_mask; |
njn | 1dcee09 | 2009-02-24 03:07:37 +0000 | [diff] [blame] | 1660 | sanitize_client_sigmask(&mask); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1661 | |
| 1662 | /* Gack. More impedance matching. Copy the possibly |
| 1663 | modified syscall args back into the guest state. */ |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 1664 | /* JRS 2009-Mar-16: if the syscall args are possibly modified, |
| 1665 | then this assertion is senseless: |
| 1666 | vg_assert(eq_SyscallArgs(&sci->args, &sci->orig_args)); |
| 1667 | The case that exposed it was sys_posix_spawn on Darwin, |
| 1668 | which heavily modifies its arguments but then lets the call |
| 1669 | go through anyway, with SfToBlock set, hence we end up here. */ |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1670 | putSyscallArgsIntoGuestState( &sci->args, &tst->arch.vex ); |
| 1671 | |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 1672 | /* Drop the bigLock */ |
sewardj | ad0a3a8 | 2006-12-17 18:58:55 +0000 | [diff] [blame] | 1673 | VG_(release_BigLock)(tid, VgTs_WaitSys, "VG_(client_syscall)[async]"); |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 1674 | /* Urr. We're now in a race against other threads trying to |
| 1675 | acquire the bigLock. I guess that doesn't matter provided |
| 1676 | that do_syscall_for_client only touches thread-local |
| 1677 | state. */ |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1678 | |
| 1679 | /* Do the call, which operates directly on the guest state, |
| 1680 | not on our abstracted copies of the args/result. */ |
| 1681 | do_syscall_for_client(sysno, tst, &mask); |
| 1682 | |
| 1683 | /* do_syscall_for_client may not return if the syscall was |
| 1684 | interrupted by a signal. In that case, flow of control is |
| 1685 | first to m_signals.async_sighandler, which calls |
| 1686 | VG_(fixup_guest_state_after_syscall_interrupted), which |
| 1687 | fixes up the guest state, and possibly calls |
| 1688 | VG_(post_syscall). Once that's done, control drops back |
| 1689 | to the scheduler. */ |
| 1690 | |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 1691 | /* Darwin: do_syscall_for_client may not return if the |
| 1692 | syscall was workq_ops(WQOPS_THREAD_RETURN) and the kernel |
| 1693 | responded by starting the thread at wqthread_hijack(reuse=1) |
| 1694 | (to run another workqueue item). In that case, wqthread_hijack |
| 1695 | calls ML_(wqthread_continue), which is similar to |
| 1696 | VG_(fixup_guest_state_after_syscall_interrupted). */ |
| 1697 | |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1698 | /* Reacquire the lock */ |
sewardj | ad0a3a8 | 2006-12-17 18:58:55 +0000 | [diff] [blame] | 1699 | VG_(acquire_BigLock)(tid, "VG_(client_syscall)[async]"); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1700 | |
| 1701 | /* Even more impedance matching. Extract the syscall status |
| 1702 | from the guest state. */ |
| 1703 | getSyscallStatusFromGuestState( &sci->status, &tst->arch.vex ); |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 1704 | vg_assert(sci->status.what == SsComplete); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1705 | |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 1706 | /* Be decorative, if required. */ |
| 1707 | if (VG_(clo_trace_syscalls)) { |
| 1708 | Bool failed = sr_isError(sci->status.sres); |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 1709 | if (failed) { |
njn | 1a1e95c | 2009-06-03 06:50:06 +0000 | [diff] [blame] | 1710 | PRINT("SYSCALL[%d,%d](%s) ... [async] --> Failure(0x%llx)", |
| 1711 | VG_(getpid)(), tid, VG_SYSNUM_STRING(sysno), |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 1712 | (ULong)sr_Err(sci->status.sres)); |
| 1713 | } else { |
njn | 1a1e95c | 2009-06-03 06:50:06 +0000 | [diff] [blame] | 1714 | PRINT("SYSCALL[%d,%d](%s) ... [async] --> " |
njn | 3373755 | 2009-05-20 05:19:22 +0000 | [diff] [blame] | 1715 | "Success(0x%llx:0x%llx)", |
njn | 1a1e95c | 2009-06-03 06:50:06 +0000 | [diff] [blame] | 1716 | VG_(getpid)(), tid, VG_SYSNUM_STRING(sysno), |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 1717 | (ULong)sr_ResHI(sci->status.sres), |
| 1718 | (ULong)sr_Res(sci->status.sres) ); |
| 1719 | } |
| 1720 | } |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1721 | |
| 1722 | } else { |
| 1723 | |
| 1724 | /* run the syscall directly */ |
| 1725 | /* The pre-handler may have modified the syscall args, but |
| 1726 | since we're passing values in ->args directly to the |
| 1727 | kernel, there's no point in flushing them back to the |
| 1728 | guest state. Indeed doing so could be construed as |
| 1729 | incorrect. */ |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1730 | SysRes sres |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 1731 | = VG_(do_syscall)(sysno, sci->args.arg1, sci->args.arg2, |
| 1732 | sci->args.arg3, sci->args.arg4, |
| 1733 | sci->args.arg5, sci->args.arg6, |
| 1734 | sci->args.arg7, sci->args.arg8 ); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1735 | sci->status = convert_SysRes_to_SyscallStatus(sres); |
| 1736 | |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 1737 | /* Be decorative, if required. */ |
| 1738 | if (VG_(clo_trace_syscalls)) { |
| 1739 | Bool failed = sr_isError(sci->status.sres); |
| 1740 | if (failed) { |
njn | 3373755 | 2009-05-20 05:19:22 +0000 | [diff] [blame] | 1741 | PRINT("[sync] --> Failure(0x%llx)", |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 1742 | (ULong)sr_Err(sci->status.sres) ); |
| 1743 | } else { |
njn | 3373755 | 2009-05-20 05:19:22 +0000 | [diff] [blame] | 1744 | PRINT("[sync] --> Success(0x%llx:0x%llx)", |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 1745 | (ULong)sr_ResHI(sci->status.sres), |
| 1746 | (ULong)sr_Res(sci->status.sres) ); |
| 1747 | } |
| 1748 | } |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1749 | } |
| 1750 | } |
| 1751 | |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 1752 | vg_assert(sci->status.what == SsComplete); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1753 | |
| 1754 | vg_assert(VG_(is_running_thread)(tid)); |
| 1755 | |
| 1756 | /* Dump the syscall result back in the guest state. This is |
| 1757 | a platform-specific action. */ |
sewardj | 1829053 | 2007-03-19 13:38:11 +0000 | [diff] [blame] | 1758 | if (!(sci->flags & SfNoWriteResult)) |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 1759 | putSyscallStatusIntoGuestState( tid, &sci->status, &tst->arch.vex ); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1760 | |
| 1761 | /* Situation now: |
| 1762 | - the guest state is now correctly modified following the syscall |
| 1763 | - modified args, original args and syscall status are still |
| 1764 | available in the syscallInfo[] entry for this syscall. |
| 1765 | |
| 1766 | Now go on to do the post-syscall actions (read on down ..) |
| 1767 | */ |
njn | 3373755 | 2009-05-20 05:19:22 +0000 | [diff] [blame] | 1768 | PRINT(" "); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1769 | VG_(post_syscall)(tid); |
njn | 3373755 | 2009-05-20 05:19:22 +0000 | [diff] [blame] | 1770 | PRINT("\n"); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1771 | } |
| 1772 | |
| 1773 | |
| 1774 | /* Perform post syscall actions. The expected state on entry is |
| 1775 | precisely as at the end of VG_(client_syscall), that is: |
| 1776 | |
| 1777 | - guest state up to date following the syscall |
| 1778 | - modified args, original args and syscall status are still |
| 1779 | available in the syscallInfo[] entry for this syscall. |
| 1780 | - syscall status matches what's in the guest state. |
| 1781 | |
| 1782 | There are two ways to get here: the normal way -- being called by |
| 1783 | VG_(client_syscall), and the unusual way, from |
| 1784 | VG_(fixup_guest_state_after_syscall_interrupted). |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 1785 | Darwin: there's a third way, ML_(wqthread_continue). |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1786 | */ |
| 1787 | void VG_(post_syscall) (ThreadId tid) |
| 1788 | { |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1789 | SyscallInfo* sci; |
| 1790 | const SyscallTableEntry* ent; |
| 1791 | SyscallStatus test_status; |
| 1792 | ThreadState* tst; |
njn | 6dad504 | 2009-05-20 05:22:38 +0000 | [diff] [blame] | 1793 | Word sysno; |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1794 | |
| 1795 | /* Preliminaries */ |
| 1796 | vg_assert(VG_(is_valid_tid)(tid)); |
| 1797 | vg_assert(tid >= 1 && tid < VG_N_THREADS); |
| 1798 | vg_assert(VG_(is_running_thread)(tid)); |
| 1799 | |
| 1800 | tst = VG_(get_ThreadState)(tid); |
| 1801 | sci = & syscallInfo[tid]; |
| 1802 | |
| 1803 | /* m_signals.sigvgkill_handler might call here even when not in |
| 1804 | a syscall. */ |
| 1805 | if (sci->status.what == SsIdle || sci->status.what == SsHandToKernel) { |
| 1806 | sci->status.what = SsIdle; |
| 1807 | return; |
| 1808 | } |
| 1809 | |
| 1810 | /* Validate current syscallInfo entry. In particular we require |
| 1811 | that the current .status matches what's actually in the guest |
sewardj | 1829053 | 2007-03-19 13:38:11 +0000 | [diff] [blame] | 1812 | state. At least in the normal case where we have actually |
| 1813 | previously written the result into the guest state. */ |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 1814 | vg_assert(sci->status.what == SsComplete); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1815 | |
| 1816 | getSyscallStatusFromGuestState( &test_status, &tst->arch.vex ); |
sewardj | 1829053 | 2007-03-19 13:38:11 +0000 | [diff] [blame] | 1817 | if (!(sci->flags & SfNoWriteResult)) |
| 1818 | vg_assert(eq_SyscallStatus( &sci->status, &test_status )); |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 1819 | /* Failure of the above assertion on Darwin can indicate a problem |
| 1820 | in the syscall wrappers that pre-fail or pre-succeed the |
| 1821 | syscall, by calling SET_STATUS_Success or SET_STATUS_Failure, |
| 1822 | when they really should call SET_STATUS_from_SysRes. The former |
| 1823 | create a UNIX-class syscall result on Darwin, which may not be |
| 1824 | correct for the syscall; if that's the case then this assertion |
njn | 4e8808b | 2009-06-05 01:33:16 +0000 | [diff] [blame] | 1825 | fires. See PRE(thread_fast_set_cthread_self) for an example. On |
| 1826 | non-Darwin platforms this assertion is should never fail, and this |
| 1827 | comment is completely irrelevant. */ |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1828 | /* Ok, looks sane */ |
| 1829 | |
| 1830 | /* Get the system call number. Because the pre-handler isn't |
| 1831 | allowed to mess with it, it should be the same for both the |
| 1832 | original and potentially-modified args. */ |
| 1833 | vg_assert(sci->args.sysno == sci->orig_args.sysno); |
| 1834 | sysno = sci->args.sysno; |
| 1835 | ent = get_syscall_entry(sysno); |
| 1836 | |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 1837 | /* pre: status == Complete (asserted above) */ |
| 1838 | /* Consider either success or failure. Now run the post handler if: |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1839 | - it exists, and |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 1840 | - Success or (Failure and PostOnFail is set) |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1841 | */ |
| 1842 | if (ent->after |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 1843 | && ((!sr_isError(sci->status.sres)) |
| 1844 | || (sr_isError(sci->status.sres) |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1845 | && (sci->flags & SfPostOnFail) ))) { |
| 1846 | |
| 1847 | (ent->after)( tid, &sci->args, &sci->status ); |
| 1848 | } |
| 1849 | |
| 1850 | /* Because the post handler might have changed the status (eg, the |
| 1851 | post-handler for sys_open can change the result from success to |
| 1852 | failure if the kernel supplied a fd that it doesn't like), once |
| 1853 | again dump the syscall result back in the guest state.*/ |
sewardj | 1829053 | 2007-03-19 13:38:11 +0000 | [diff] [blame] | 1854 | if (!(sci->flags & SfNoWriteResult)) |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 1855 | putSyscallStatusIntoGuestState( tid, &sci->status, &tst->arch.vex ); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1856 | |
| 1857 | /* Do any post-syscall actions required by the tool. */ |
sewardj | 1c0ce7a | 2009-07-01 08:10:49 +0000 | [diff] [blame] | 1858 | if (VG_(needs).syscall_wrapper) { |
| 1859 | UWord tmpv[8]; |
| 1860 | tmpv[0] = sci->orig_args.arg1; |
| 1861 | tmpv[1] = sci->orig_args.arg2; |
| 1862 | tmpv[2] = sci->orig_args.arg3; |
| 1863 | tmpv[3] = sci->orig_args.arg4; |
| 1864 | tmpv[4] = sci->orig_args.arg5; |
| 1865 | tmpv[5] = sci->orig_args.arg6; |
| 1866 | tmpv[6] = sci->orig_args.arg7; |
| 1867 | tmpv[7] = sci->orig_args.arg8; |
| 1868 | VG_TDICT_CALL(tool_post_syscall, tid, |
| 1869 | sysno, |
| 1870 | &tmpv[0], sizeof(tmpv)/sizeof(tmpv[0]), |
| 1871 | sci->status.sres); |
| 1872 | } |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1873 | |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1874 | /* The syscall is done. */ |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 1875 | vg_assert(sci->status.what == SsComplete); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1876 | sci->status.what = SsIdle; |
| 1877 | |
| 1878 | /* The pre/post wrappers may have concluded that pending signals |
| 1879 | might have been created, and will have set SfPollAfter to |
| 1880 | request a poll for them once the syscall is done. */ |
| 1881 | if (sci->flags & SfPollAfter) |
| 1882 | VG_(poll_signals)(tid); |
| 1883 | |
| 1884 | /* Similarly, the wrappers might have asked for a yield |
| 1885 | afterwards. */ |
| 1886 | if (sci->flags & SfYieldAfter) |
| 1887 | VG_(vg_yield)(); |
| 1888 | } |
| 1889 | |
| 1890 | |
| 1891 | /* --------------------------------------------------------------------- |
| 1892 | Dealing with syscalls which get interrupted by a signal: |
| 1893 | VG_(fixup_guest_state_after_syscall_interrupted) |
| 1894 | ------------------------------------------------------------------ */ |
| 1895 | |
| 1896 | /* Syscalls done on behalf of the client are finally handed off to the |
| 1897 | kernel in VG_(client_syscall) above, either by calling |
| 1898 | do_syscall_for_client (the async case), or by calling |
| 1899 | VG_(do_syscall6) (the sync case). |
| 1900 | |
| 1901 | If the syscall is not interrupted by a signal (it may block and |
| 1902 | later unblock, but that's irrelevant here) then those functions |
| 1903 | eventually return and so control is passed to VG_(post_syscall). |
| 1904 | NB: not sure if the sync case can actually get interrupted, as it |
| 1905 | operates with all signals masked. |
| 1906 | |
| 1907 | However, the syscall may get interrupted by an async-signal. In |
| 1908 | that case do_syscall_for_client/VG_(do_syscall6) do not |
| 1909 | return. Instead we wind up in m_signals.async_sighandler. We need |
| 1910 | to fix up the guest state to make it look like the syscall was |
| 1911 | interrupted for guest. So async_sighandler calls here, and this |
| 1912 | does the fixup. Note that from here we wind up calling |
| 1913 | VG_(post_syscall) too. |
| 1914 | */ |
| 1915 | |
| 1916 | |
sewardj | 1b9cd1c | 2005-06-28 19:04:51 +0000 | [diff] [blame] | 1917 | /* These are addresses within ML_(do_syscall_for_client_WRK). See |
| 1918 | syscall-$PLAT.S for details. |
| 1919 | */ |
sewardj | 6e9de46 | 2011-06-28 07:25:29 +0000 | [diff] [blame] | 1920 | #if defined(VGO_linux) |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 1921 | extern const Addr ML_(blksys_setup); |
| 1922 | extern const Addr ML_(blksys_restart); |
| 1923 | extern const Addr ML_(blksys_complete); |
| 1924 | extern const Addr ML_(blksys_committed); |
| 1925 | extern const Addr ML_(blksys_finished); |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 1926 | #elif defined(VGO_darwin) |
| 1927 | /* Darwin requires extra uglyness */ |
| 1928 | extern const Addr ML_(blksys_setup_MACH); |
| 1929 | extern const Addr ML_(blksys_restart_MACH); |
| 1930 | extern const Addr ML_(blksys_complete_MACH); |
| 1931 | extern const Addr ML_(blksys_committed_MACH); |
| 1932 | extern const Addr ML_(blksys_finished_MACH); |
| 1933 | extern const Addr ML_(blksys_setup_MDEP); |
| 1934 | extern const Addr ML_(blksys_restart_MDEP); |
| 1935 | extern const Addr ML_(blksys_complete_MDEP); |
| 1936 | extern const Addr ML_(blksys_committed_MDEP); |
| 1937 | extern const Addr ML_(blksys_finished_MDEP); |
| 1938 | extern const Addr ML_(blksys_setup_UNIX); |
| 1939 | extern const Addr ML_(blksys_restart_UNIX); |
| 1940 | extern const Addr ML_(blksys_complete_UNIX); |
| 1941 | extern const Addr ML_(blksys_committed_UNIX); |
| 1942 | extern const Addr ML_(blksys_finished_UNIX); |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 1943 | #else |
| 1944 | # error "Unknown OS" |
| 1945 | #endif |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1946 | |
| 1947 | |
| 1948 | /* Back up guest state to restart a system call. */ |
| 1949 | |
sewardj | 7eb7c58 | 2005-06-23 01:02:53 +0000 | [diff] [blame] | 1950 | void ML_(fixup_guest_state_to_restart_syscall) ( ThreadArchState* arch ) |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1951 | { |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 1952 | #if defined(VGP_x86_linux) |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1953 | arch->vex.guest_EIP -= 2; // sizeof(int $0x80) |
| 1954 | |
| 1955 | /* Make sure our caller is actually sane, and we're really backing |
| 1956 | back over a syscall. |
| 1957 | |
| 1958 | int $0x80 == CD 80 |
| 1959 | */ |
| 1960 | { |
| 1961 | UChar *p = (UChar *)arch->vex.guest_EIP; |
| 1962 | |
| 1963 | if (p[0] != 0xcd || p[1] != 0x80) |
| 1964 | VG_(message)(Vg_DebugMsg, |
bart | a0b6b2c | 2008-07-07 06:49:24 +0000 | [diff] [blame] | 1965 | "?! restarting over syscall at %#x %02x %02x\n", |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1966 | arch->vex.guest_EIP, p[0], p[1]); |
| 1967 | |
| 1968 | vg_assert(p[0] == 0xcd && p[1] == 0x80); |
| 1969 | } |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1970 | |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 1971 | #elif defined(VGP_amd64_linux) |
sewardj | e7aa4ae | 2005-06-09 12:43:42 +0000 | [diff] [blame] | 1972 | arch->vex.guest_RIP -= 2; // sizeof(syscall) |
| 1973 | |
| 1974 | /* Make sure our caller is actually sane, and we're really backing |
| 1975 | back over a syscall. |
| 1976 | |
| 1977 | syscall == 0F 05 |
| 1978 | */ |
| 1979 | { |
| 1980 | UChar *p = (UChar *)arch->vex.guest_RIP; |
| 1981 | |
| 1982 | if (p[0] != 0x0F || p[1] != 0x05) |
| 1983 | VG_(message)(Vg_DebugMsg, |
bart | a0b6b2c | 2008-07-07 06:49:24 +0000 | [diff] [blame] | 1984 | "?! restarting over syscall at %#llx %02x %02x\n", |
sewardj | e7aa4ae | 2005-06-09 12:43:42 +0000 | [diff] [blame] | 1985 | arch->vex.guest_RIP, p[0], p[1]); |
| 1986 | |
| 1987 | vg_assert(p[0] == 0x0F && p[1] == 0x05); |
| 1988 | } |
sewardj | e7aa4ae | 2005-06-09 12:43:42 +0000 | [diff] [blame] | 1989 | |
sewardj | 2c48c7b | 2005-11-29 13:05:56 +0000 | [diff] [blame] | 1990 | #elif defined(VGP_ppc32_linux) || defined(VGP_ppc64_linux) |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 1991 | arch->vex.guest_CIA -= 4; // sizeof(ppc32 instr) |
| 1992 | |
| 1993 | /* Make sure our caller is actually sane, and we're really backing |
| 1994 | back over a syscall. |
| 1995 | |
| 1996 | sc == 44 00 00 02 |
| 1997 | */ |
| 1998 | { |
| 1999 | UChar *p = (UChar *)arch->vex.guest_CIA; |
| 2000 | |
| 2001 | if (p[0] != 0x44 || p[1] != 0x0 || p[2] != 0x0 || p[3] != 0x02) |
| 2002 | VG_(message)(Vg_DebugMsg, |
bart | a0b6b2c | 2008-07-07 06:49:24 +0000 | [diff] [blame] | 2003 | "?! restarting over syscall at %#llx %02x %02x %02x %02x\n", |
| 2004 | arch->vex.guest_CIA + 0ULL, p[0], p[1], p[2], p[3]); |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 2005 | |
| 2006 | vg_assert(p[0] == 0x44 && p[1] == 0x0 && p[2] == 0x0 && p[3] == 0x2); |
| 2007 | } |
| 2008 | |
sewardj | 59570ff | 2010-01-01 11:59:33 +0000 | [diff] [blame] | 2009 | #elif defined(VGP_arm_linux) |
sewardj | 4dddd06 | 2010-08-22 22:18:31 +0000 | [diff] [blame] | 2010 | if (arch->vex.guest_R15T & 1) { |
| 2011 | // Thumb mode. SVC is a encoded as |
| 2012 | // 1101 1111 imm8 |
| 2013 | // where imm8 is the SVC number, and we only accept 0. |
| 2014 | arch->vex.guest_R15T -= 2; // sizeof(thumb 16 bit insn) |
| 2015 | UChar* p = (UChar*)(arch->vex.guest_R15T - 1); |
| 2016 | Bool valid = p[0] == 0 && p[1] == 0xDF; |
| 2017 | if (!valid) { |
sewardj | 59570ff | 2010-01-01 11:59:33 +0000 | [diff] [blame] | 2018 | VG_(message)(Vg_DebugMsg, |
sewardj | 4dddd06 | 2010-08-22 22:18:31 +0000 | [diff] [blame] | 2019 | "?! restarting over (Thumb) syscall that is not syscall " |
| 2020 | "at %#llx %02x %02x\n", |
| 2021 | arch->vex.guest_R15T - 1ULL, p[0], p[1]); |
| 2022 | } |
| 2023 | vg_assert(valid); |
| 2024 | // FIXME: NOTE, this really isn't right. We need to back up |
| 2025 | // ITSTATE to what it was before the SVC instruction, but we |
| 2026 | // don't know what it was. At least assert that it is now |
| 2027 | // zero, because if it is nonzero then it must also have |
| 2028 | // been nonzero for the SVC itself, which means it was |
| 2029 | // conditional. Urk. |
| 2030 | vg_assert(arch->vex.guest_ITSTATE == 0); |
| 2031 | } else { |
| 2032 | // ARM mode. SVC is encoded as |
| 2033 | // cond 1111 imm24 |
| 2034 | // where imm24 is the SVC number, and we only accept 0. |
| 2035 | arch->vex.guest_R15T -= 4; // sizeof(arm instr) |
| 2036 | UChar* p = (UChar*)arch->vex.guest_R15T; |
| 2037 | Bool valid = p[0] == 0 && p[1] == 0 && p[2] == 0 |
| 2038 | && (p[3] & 0xF) == 0xF; |
| 2039 | if (!valid) { |
| 2040 | VG_(message)(Vg_DebugMsg, |
| 2041 | "?! restarting over (ARM) syscall that is not syscall " |
| 2042 | "at %#llx %02x %02x %02x %02x\n", |
sewardj | 9dcfdff | 2010-08-22 12:00:40 +0000 | [diff] [blame] | 2043 | arch->vex.guest_R15T + 0ULL, p[0], p[1], p[2], p[3]); |
sewardj | 4dddd06 | 2010-08-22 22:18:31 +0000 | [diff] [blame] | 2044 | } |
| 2045 | vg_assert(valid); |
sewardj | 59570ff | 2010-01-01 11:59:33 +0000 | [diff] [blame] | 2046 | } |
| 2047 | |
sewardj | f0c1250 | 2014-01-12 12:54:00 +0000 | [diff] [blame] | 2048 | #elif defined(VGP_arm64_linux) |
sewardj | dbb328d | 2014-02-20 23:18:32 +0000 | [diff] [blame] | 2049 | arch->vex.guest_PC -= 4; // sizeof(arm64 instr) |
| 2050 | |
| 2051 | /* Make sure our caller is actually sane, and we're really backing |
| 2052 | back over a syscall. |
| 2053 | |
| 2054 | svc #0 == d4 00 00 01 |
| 2055 | */ |
| 2056 | { |
| 2057 | UChar *p = (UChar *)arch->vex.guest_PC; |
| 2058 | |
| 2059 | if (p[0] != 0x01 || p[1] != 0x00 || p[2] != 0x00 || p[3] != 0xD4) |
| 2060 | VG_(message)( |
| 2061 | Vg_DebugMsg, |
| 2062 | "?! restarting over syscall at %#llx %02x %02x %02x %02x\n", |
| 2063 | arch->vex.guest_PC + 0ULL, p[0], p[1], p[2], p[3] |
| 2064 | ); |
| 2065 | |
| 2066 | vg_assert(p[0] == 0x01 && p[1] == 0x00 && p[2] == 0x00 && p[3] == 0xD4); |
| 2067 | } |
sewardj | f0c1250 | 2014-01-12 12:54:00 +0000 | [diff] [blame] | 2068 | |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 2069 | #elif defined(VGP_x86_darwin) |
| 2070 | arch->vex.guest_EIP = arch->vex.guest_IP_AT_SYSCALL; |
| 2071 | |
| 2072 | /* Make sure our caller is actually sane, and we're really backing |
| 2073 | back over a syscall. |
| 2074 | |
| 2075 | int $0x80 == CD 80 |
| 2076 | int $0x81 == CD 81 |
| 2077 | int $0x82 == CD 82 |
| 2078 | sysenter == 0F 34 |
| 2079 | */ |
| 2080 | { |
| 2081 | UChar *p = (UChar *)arch->vex.guest_EIP; |
| 2082 | Bool ok = (p[0] == 0xCD && p[1] == 0x80) |
| 2083 | || (p[0] == 0xCD && p[1] == 0x81) |
| 2084 | || (p[0] == 0xCD && p[1] == 0x82) |
| 2085 | || (p[0] == 0x0F && p[1] == 0x34); |
| 2086 | if (!ok) |
| 2087 | VG_(message)(Vg_DebugMsg, |
| 2088 | "?! restarting over syscall at %#x %02x %02x\n", |
| 2089 | arch->vex.guest_EIP, p[0], p[1]); |
| 2090 | vg_assert(ok); |
| 2091 | } |
| 2092 | |
| 2093 | #elif defined(VGP_amd64_darwin) |
| 2094 | // DDD: #warning GrP fixme amd64 restart unimplemented |
| 2095 | vg_assert(0); |
| 2096 | |
sewardj | b5b8740 | 2011-03-07 16:05:35 +0000 | [diff] [blame] | 2097 | #elif defined(VGP_s390x_linux) |
| 2098 | arch->vex.guest_IA -= 2; // sizeof(syscall) |
| 2099 | |
| 2100 | /* Make sure our caller is actually sane, and we're really backing |
| 2101 | back over a syscall. |
| 2102 | |
| 2103 | syscall == 0A <num> |
| 2104 | */ |
| 2105 | { |
| 2106 | UChar *p = (UChar *)arch->vex.guest_IA; |
| 2107 | if (p[0] != 0x0A) |
| 2108 | VG_(message)(Vg_DebugMsg, |
| 2109 | "?! restarting over syscall at %#llx %02x %02x\n", |
| 2110 | arch->vex.guest_IA, p[0], p[1]); |
| 2111 | |
| 2112 | vg_assert(p[0] == 0x0A); |
| 2113 | } |
sewardj | 5db1540 | 2012-06-07 09:13:21 +0000 | [diff] [blame] | 2114 | |
petarj | 4df0bfc | 2013-02-27 23:17:33 +0000 | [diff] [blame] | 2115 | #elif defined(VGP_mips32_linux) || defined(VGP_mips64_linux) |
sewardj | 5db1540 | 2012-06-07 09:13:21 +0000 | [diff] [blame] | 2116 | |
| 2117 | arch->vex.guest_PC -= 4; // sizeof(mips instr) |
| 2118 | |
| 2119 | /* Make sure our caller is actually sane, and we're really backing |
| 2120 | back over a syscall. |
| 2121 | |
| 2122 | syscall == 00 00 00 0C |
| 2123 | big endian |
| 2124 | syscall == 0C 00 00 00 |
| 2125 | */ |
| 2126 | { |
| 2127 | UChar *p = (UChar *)(arch->vex.guest_PC); |
| 2128 | # if defined (VG_LITTLEENDIAN) |
| 2129 | if (p[0] != 0x0c || p[1] != 0x00 || p[2] != 0x00 || p[3] != 0x00) |
| 2130 | VG_(message)(Vg_DebugMsg, |
petarj | 4df0bfc | 2013-02-27 23:17:33 +0000 | [diff] [blame] | 2131 | "?! restarting over syscall at %#llx %02x %02x %02x %02x\n", |
dejanj | 751c1e6 | 2013-08-15 13:37:29 +0000 | [diff] [blame] | 2132 | (ULong)arch->vex.guest_PC, p[0], p[1], p[2], p[3]); |
sewardj | 5db1540 | 2012-06-07 09:13:21 +0000 | [diff] [blame] | 2133 | |
| 2134 | vg_assert(p[0] == 0x0c && p[1] == 0x00 && p[2] == 0x00 && p[3] == 0x00); |
| 2135 | # elif defined (VG_BIGENDIAN) |
| 2136 | if (p[0] != 0x00 || p[1] != 0x00 || p[2] != 0x00 || p[3] != 0x0c) |
| 2137 | VG_(message)(Vg_DebugMsg, |
petarj | 4df0bfc | 2013-02-27 23:17:33 +0000 | [diff] [blame] | 2138 | "?! restarting over syscall at %#llx %02x %02x %02x %02x\n", |
dejanj | 751c1e6 | 2013-08-15 13:37:29 +0000 | [diff] [blame] | 2139 | (ULong)arch->vex.guest_PC, p[0], p[1], p[2], p[3]); |
sewardj | 5db1540 | 2012-06-07 09:13:21 +0000 | [diff] [blame] | 2140 | |
| 2141 | vg_assert(p[0] == 0x00 && p[1] == 0x00 && p[2] == 0x00 && p[3] == 0x0c); |
| 2142 | # else |
| 2143 | # error "Unknown endianness" |
| 2144 | # endif |
| 2145 | } |
| 2146 | |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 2147 | #else |
cerion | 7b2c38c | 2005-06-23 07:52:54 +0000 | [diff] [blame] | 2148 | # error "ML_(fixup_guest_state_to_restart_syscall): unknown plat" |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 2149 | #endif |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2150 | } |
| 2151 | |
sewardj | 5db1540 | 2012-06-07 09:13:21 +0000 | [diff] [blame] | 2152 | |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2153 | /* |
| 2154 | Fix up the guest state when a syscall is interrupted by a signal |
| 2155 | and so has been forced to return 'sysret'. |
| 2156 | |
| 2157 | To do this, we determine the precise state of the syscall by |
| 2158 | looking at the (real) IP at the time the signal happened. The |
| 2159 | syscall sequence looks like: |
| 2160 | |
| 2161 | 1. unblock signals |
| 2162 | 2. perform syscall |
sewardj | 5db1540 | 2012-06-07 09:13:21 +0000 | [diff] [blame] | 2163 | 3. save result to guest state (EAX, RAX, R3+CR0.SO, R0, V0) |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2164 | 4. re-block signals |
| 2165 | |
| 2166 | If a signal |
| 2167 | happens at Then Why? |
| 2168 | [1-2) restart nothing has happened (restart syscall) |
| 2169 | [2] restart syscall hasn't started, or kernel wants to restart |
| 2170 | [2-3) save syscall complete, but results not saved |
| 2171 | [3-4) syscall complete, results saved |
| 2172 | |
| 2173 | Sometimes we never want to restart an interrupted syscall (because |
| 2174 | sigaction says not to), so we only restart if "restart" is True. |
| 2175 | |
| 2176 | This will also call VG_(post_syscall) if the syscall has actually |
| 2177 | completed (either because it was interrupted, or because it |
| 2178 | actually finished). It will not call VG_(post_syscall) if the |
| 2179 | syscall is set up for restart, which means that the pre-wrapper may |
| 2180 | get called multiple times. |
| 2181 | */ |
| 2182 | |
| 2183 | void |
| 2184 | VG_(fixup_guest_state_after_syscall_interrupted)( ThreadId tid, |
| 2185 | Addr ip, |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 2186 | SysRes sres, |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2187 | Bool restart) |
| 2188 | { |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 2189 | /* Note that we don't know the syscall number here, since (1) in |
| 2190 | general there's no reliable way to get hold of it short of |
| 2191 | stashing it in the guest state before the syscall, and (2) in |
| 2192 | any case we don't need to know it for the actions done by this |
| 2193 | routine. |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 2194 | |
| 2195 | Furthermore, 'sres' is only used in the case where the syscall |
| 2196 | is complete, but the result has not been committed to the guest |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 2197 | state yet. In any other situation it will be meaningless and |
| 2198 | therefore ignored. */ |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2199 | |
| 2200 | ThreadState* tst; |
| 2201 | SyscallStatus canonical; |
| 2202 | ThreadArchState* th_regs; |
| 2203 | SyscallInfo* sci; |
| 2204 | |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 2205 | /* Compute some Booleans indicating which range we're in. */ |
| 2206 | Bool outside_range, |
| 2207 | in_setup_to_restart, // [1,2) in the .S files |
| 2208 | at_restart, // [2] in the .S files |
| 2209 | in_complete_to_committed, // [3,4) in the .S files |
| 2210 | in_committed_to_finished; // [4,5) in the .S files |
| 2211 | |
sewardj | 6e9de46 | 2011-06-28 07:25:29 +0000 | [diff] [blame] | 2212 | # if defined(VGO_linux) |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 2213 | outside_range |
| 2214 | = ip < ML_(blksys_setup) || ip >= ML_(blksys_finished); |
| 2215 | in_setup_to_restart |
| 2216 | = ip >= ML_(blksys_setup) && ip < ML_(blksys_restart); |
| 2217 | at_restart |
| 2218 | = ip == ML_(blksys_restart); |
| 2219 | in_complete_to_committed |
| 2220 | = ip >= ML_(blksys_complete) && ip < ML_(blksys_committed); |
| 2221 | in_committed_to_finished |
| 2222 | = ip >= ML_(blksys_committed) && ip < ML_(blksys_finished); |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 2223 | # elif defined(VGO_darwin) |
| 2224 | outside_range |
| 2225 | = (ip < ML_(blksys_setup_MACH) || ip >= ML_(blksys_finished_MACH)) |
| 2226 | && (ip < ML_(blksys_setup_MDEP) || ip >= ML_(blksys_finished_MDEP)) |
| 2227 | && (ip < ML_(blksys_setup_UNIX) || ip >= ML_(blksys_finished_UNIX)); |
| 2228 | in_setup_to_restart |
| 2229 | = (ip >= ML_(blksys_setup_MACH) && ip < ML_(blksys_restart_MACH)) |
| 2230 | || (ip >= ML_(blksys_setup_MDEP) && ip < ML_(blksys_restart_MDEP)) |
| 2231 | || (ip >= ML_(blksys_setup_UNIX) && ip < ML_(blksys_restart_UNIX)); |
| 2232 | at_restart |
| 2233 | = (ip == ML_(blksys_restart_MACH)) |
| 2234 | || (ip == ML_(blksys_restart_MDEP)) |
| 2235 | || (ip == ML_(blksys_restart_UNIX)); |
| 2236 | in_complete_to_committed |
| 2237 | = (ip >= ML_(blksys_complete_MACH) && ip < ML_(blksys_committed_MACH)) |
| 2238 | || (ip >= ML_(blksys_complete_MDEP) && ip < ML_(blksys_committed_MDEP)) |
| 2239 | || (ip >= ML_(blksys_complete_UNIX) && ip < ML_(blksys_committed_UNIX)); |
| 2240 | in_committed_to_finished |
| 2241 | = (ip >= ML_(blksys_committed_MACH) && ip < ML_(blksys_finished_MACH)) |
| 2242 | || (ip >= ML_(blksys_committed_MDEP) && ip < ML_(blksys_finished_MDEP)) |
| 2243 | || (ip >= ML_(blksys_committed_UNIX) && ip < ML_(blksys_finished_UNIX)); |
| 2244 | /* Wasn't that just So Much Fun? Does your head hurt yet? Mine does. */ |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 2245 | # else |
| 2246 | # error "Unknown OS" |
| 2247 | # endif |
| 2248 | |
| 2249 | if (VG_(clo_trace_signals)) |
| 2250 | VG_(message)( Vg_DebugMsg, |
| 2251 | "interrupted_syscall: tid=%d, ip=0x%llx, " |
tom | d864cad | 2009-12-01 10:25:12 +0000 | [diff] [blame] | 2252 | "restart=%s, sres.isErr=%s, sres.val=%lld\n", |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 2253 | (Int)tid, |
| 2254 | (ULong)ip, |
| 2255 | restart ? "True" : "False", |
| 2256 | sr_isError(sres) ? "True" : "False", |
| 2257 | (Long)(sr_isError(sres) ? sr_Err(sres) : sr_Res(sres)) ); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2258 | |
| 2259 | vg_assert(VG_(is_valid_tid)(tid)); |
| 2260 | vg_assert(tid >= 1 && tid < VG_N_THREADS); |
| 2261 | vg_assert(VG_(is_running_thread)(tid)); |
| 2262 | |
| 2263 | tst = VG_(get_ThreadState)(tid); |
| 2264 | th_regs = &tst->arch; |
| 2265 | sci = & syscallInfo[tid]; |
| 2266 | |
| 2267 | /* Figure out what the state of the syscall was by examining the |
| 2268 | (real) IP at the time of the signal, and act accordingly. */ |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 2269 | if (outside_range) { |
| 2270 | if (VG_(clo_trace_signals)) |
| 2271 | VG_(message)( Vg_DebugMsg, |
tom | d864cad | 2009-12-01 10:25:12 +0000 | [diff] [blame] | 2272 | " not in syscall at all: hmm, very suspicious\n" ); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2273 | /* Looks like we weren't in a syscall at all. Hmm. */ |
| 2274 | vg_assert(sci->status.what != SsIdle); |
| 2275 | return; |
| 2276 | } |
| 2277 | |
| 2278 | /* We should not be here unless this thread had first started up |
| 2279 | the machinery for a syscall by calling VG_(client_syscall). |
| 2280 | Hence: */ |
| 2281 | vg_assert(sci->status.what != SsIdle); |
| 2282 | |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 2283 | /* now, do one of four fixup actions, depending on where the IP has |
| 2284 | got to. */ |
| 2285 | |
| 2286 | if (in_setup_to_restart) { |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2287 | /* syscall hasn't even started; go around again */ |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 2288 | if (VG_(clo_trace_signals)) |
tom | d864cad | 2009-12-01 10:25:12 +0000 | [diff] [blame] | 2289 | VG_(message)( Vg_DebugMsg, " not started: restarting\n"); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2290 | vg_assert(sci->status.what == SsHandToKernel); |
sewardj | 7eb7c58 | 2005-06-23 01:02:53 +0000 | [diff] [blame] | 2291 | ML_(fixup_guest_state_to_restart_syscall)(th_regs); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2292 | } |
| 2293 | |
| 2294 | else |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 2295 | if (at_restart) { |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2296 | /* We're either about to run the syscall, or it was interrupted |
| 2297 | and the kernel restarted it. Restart if asked, otherwise |
| 2298 | EINTR it. */ |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 2299 | if (restart) { |
| 2300 | if (VG_(clo_trace_signals)) |
tom | d864cad | 2009-12-01 10:25:12 +0000 | [diff] [blame] | 2301 | VG_(message)( Vg_DebugMsg, " at syscall instr: restarting\n"); |
sewardj | 7eb7c58 | 2005-06-23 01:02:53 +0000 | [diff] [blame] | 2302 | ML_(fixup_guest_state_to_restart_syscall)(th_regs); |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 2303 | } else { |
| 2304 | if (VG_(clo_trace_signals)) |
tom | d864cad | 2009-12-01 10:25:12 +0000 | [diff] [blame] | 2305 | VG_(message)( Vg_DebugMsg, " at syscall instr: returning EINTR\n"); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2306 | canonical = convert_SysRes_to_SyscallStatus( |
| 2307 | VG_(mk_SysRes_Error)( VKI_EINTR ) |
| 2308 | ); |
sewardj | 1829053 | 2007-03-19 13:38:11 +0000 | [diff] [blame] | 2309 | if (!(sci->flags & SfNoWriteResult)) |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 2310 | putSyscallStatusIntoGuestState( tid, &canonical, &th_regs->vex ); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2311 | sci->status = canonical; |
| 2312 | VG_(post_syscall)(tid); |
| 2313 | } |
| 2314 | } |
| 2315 | |
| 2316 | else |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 2317 | if (in_complete_to_committed) { |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2318 | /* Syscall complete, but result hasn't been written back yet. |
| 2319 | Write the SysRes we were supplied with back to the guest |
| 2320 | state. */ |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 2321 | if (VG_(clo_trace_signals)) |
| 2322 | VG_(message)( Vg_DebugMsg, |
tom | d864cad | 2009-12-01 10:25:12 +0000 | [diff] [blame] | 2323 | " completed, but uncommitted: committing\n"); |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 2324 | canonical = convert_SysRes_to_SyscallStatus( sres ); |
sewardj | 1829053 | 2007-03-19 13:38:11 +0000 | [diff] [blame] | 2325 | if (!(sci->flags & SfNoWriteResult)) |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 2326 | putSyscallStatusIntoGuestState( tid, &canonical, &th_regs->vex ); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2327 | sci->status = canonical; |
| 2328 | VG_(post_syscall)(tid); |
| 2329 | } |
| 2330 | |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 2331 | else |
| 2332 | if (in_committed_to_finished) { |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2333 | /* Result committed, but the signal mask has not been restored; |
| 2334 | we expect our caller (the signal handler) will have fixed |
| 2335 | this up. */ |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 2336 | if (VG_(clo_trace_signals)) |
| 2337 | VG_(message)( Vg_DebugMsg, |
tom | d864cad | 2009-12-01 10:25:12 +0000 | [diff] [blame] | 2338 | " completed and committed: nothing to do\n"); |
tom | bbcf0e2 | 2009-10-29 14:03:02 +0000 | [diff] [blame] | 2339 | getSyscallStatusFromGuestState( &sci->status, &th_regs->vex ); |
| 2340 | vg_assert(sci->status.what == SsComplete); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2341 | VG_(post_syscall)(tid); |
| 2342 | } |
| 2343 | |
| 2344 | else |
| 2345 | VG_(core_panic)("?? strange syscall interrupt state?"); |
| 2346 | |
| 2347 | /* In all cases, the syscall is now finished (even if we called |
cerion | 7b2c38c | 2005-06-23 07:52:54 +0000 | [diff] [blame] | 2348 | ML_(fixup_guest_state_to_restart_syscall), since that just |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2349 | re-positions the guest's IP for another go at it). So we need |
| 2350 | to record that fact. */ |
| 2351 | sci->status.what = SsIdle; |
| 2352 | } |
| 2353 | |
| 2354 | |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 2355 | #if defined(VGO_darwin) |
| 2356 | // Clean up after workq_ops(WQOPS_THREAD_RETURN) jumped to wqthread_hijack. |
| 2357 | // This is similar to VG_(fixup_guest_state_after_syscall_interrupted). |
| 2358 | // This longjmps back to the scheduler. |
| 2359 | void ML_(wqthread_continue_NORETURN)(ThreadId tid) |
| 2360 | { |
| 2361 | ThreadState* tst; |
| 2362 | SyscallInfo* sci; |
| 2363 | |
| 2364 | VG_(acquire_BigLock)(tid, "wqthread_continue_NORETURN"); |
| 2365 | |
njn | 1a1e95c | 2009-06-03 06:50:06 +0000 | [diff] [blame] | 2366 | PRINT("SYSCALL[%d,%d](%s) workq_ops() starting new workqueue item\n", |
| 2367 | VG_(getpid)(), tid, VG_SYSNUM_STRING(__NR_workq_ops)); |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 2368 | |
| 2369 | vg_assert(VG_(is_valid_tid)(tid)); |
| 2370 | vg_assert(tid >= 1 && tid < VG_N_THREADS); |
| 2371 | vg_assert(VG_(is_running_thread)(tid)); |
| 2372 | |
| 2373 | tst = VG_(get_ThreadState)(tid); |
| 2374 | sci = & syscallInfo[tid]; |
| 2375 | vg_assert(sci->status.what != SsIdle); |
| 2376 | vg_assert(tst->os_state.wq_jmpbuf_valid); // check this BEFORE post_syscall |
| 2377 | |
| 2378 | // Pretend the syscall completed normally, but don't touch the thread state. |
| 2379 | sci->status = convert_SysRes_to_SyscallStatus( VG_(mk_SysRes_Success)(0) ); |
| 2380 | sci->flags |= SfNoWriteResult; |
| 2381 | VG_(post_syscall)(tid); |
| 2382 | |
| 2383 | sci->status.what = SsIdle; |
| 2384 | |
| 2385 | vg_assert(tst->sched_jmpbuf_valid); |
sewardj | 38a2859 | 2011-04-11 22:08:06 +0000 | [diff] [blame] | 2386 | VG_MINIMAL_LONGJMP(tst->sched_jmpbuf); |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 2387 | |
| 2388 | /* NOTREACHED */ |
| 2389 | vg_assert(0); |
| 2390 | } |
| 2391 | #endif |
| 2392 | |
| 2393 | |
sewardj | 1ae3f3a | 2005-09-28 10:47:38 +0000 | [diff] [blame] | 2394 | /* --------------------------------------------------------------------- |
| 2395 | A place to store the where-to-call-when-really-done pointer |
| 2396 | ------------------------------------------------------------------ */ |
| 2397 | |
| 2398 | // When the final thread is done, where shall I call to shutdown the |
| 2399 | // system cleanly? Is set once at startup (in m_main) and never |
| 2400 | // changes after that. Is basically a pointer to the exit |
| 2401 | // continuation. This is all just a nasty hack to avoid calling |
| 2402 | // directly from m_syswrap to m_main at exit, since that would cause |
| 2403 | // m_main to become part of a module cycle, which is silly. |
| 2404 | void (* VG_(address_of_m_main_shutdown_actions_NORETURN) ) |
| 2405 | (ThreadId,VgSchedReturnCode) |
| 2406 | = NULL; |
| 2407 | |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2408 | /*--------------------------------------------------------------------*/ |
njn | c1b0181 | 2005-06-17 22:19:06 +0000 | [diff] [blame] | 2409 | /*--- end ---*/ |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2410 | /*--------------------------------------------------------------------*/ |