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 | 03f8d3f | 2012-08-05 15:46:46 +0000 | [diff] [blame] | 10 | Copyright (C) 2000-2012 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) |
sewardj | 5db1540 | 2012-06-07 09:13:21 +0000 | [diff] [blame] | 71 | mips v0 a0 a1 a2 a3 stack stack n/a n/a v0 (== NUM) |
sewardj | 6e9de46 | 2011-06-28 07:25:29 +0000 | [diff] [blame] | 72 | |
sewardj | b5b8740 | 2011-03-07 16:05:35 +0000 | [diff] [blame] | 73 | On s390x the svc instruction is used for system calls. The system call |
| 74 | number is encoded in the instruction (8 bit immediate field). Since Linux |
| 75 | 2.6 it is also allowed to use svc 0 with the system call number in r1. |
| 76 | This was introduced for system calls >255, but works for all. It is |
| 77 | also possible to see the svc 0 together with an EXecute instruction, that |
| 78 | fills in the immediate field. |
| 79 | 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] | 80 | |
| 81 | DARWIN: |
| 82 | x86 eax +4 +8 +12 +16 +20 +24 +28 +32 edx:eax, eflags.c |
| 83 | amd64 rax rdi rsi rdx rcx r8 r9 +8 +16 rdx:rax, rflags.c |
| 84 | |
| 85 | For x86-darwin, "+N" denotes "in memory at N(%esp)"; ditto |
| 86 | amd64-darwin. Apparently 0(%esp) is some kind of return address |
| 87 | (perhaps for syscalls done with "sysenter"?) I don't think it is |
| 88 | relevant for syscalls done with "int $0x80/1/2". |
sewardj | e7aa4ae | 2005-06-09 12:43:42 +0000 | [diff] [blame] | 89 | */ |
| 90 | |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 91 | /* This is the top level of the system-call handler module. All |
| 92 | system calls are channelled through here, doing two things: |
| 93 | |
| 94 | * notify the tool of the events (mem/reg reads, writes) happening |
| 95 | |
| 96 | * perform the syscall, usually by passing it along to the kernel |
| 97 | unmodified. |
| 98 | |
| 99 | A magical piece of assembly code, do_syscall_for_client_WRK, in |
| 100 | syscall-$PLATFORM.S does the tricky bit of passing a syscall to the |
| 101 | kernel, whilst having the simulator retain control. |
| 102 | */ |
| 103 | |
| 104 | /* The main function is VG_(client_syscall). The simulation calls it |
| 105 | whenever a client thread wants to do a syscall. The following is a |
| 106 | sketch of what it does. |
| 107 | |
sewardj | 2547532 | 2008-10-27 01:23:04 +0000 | [diff] [blame] | 108 | * Ensures the root thread's stack is suitably mapped. Tedious and |
| 109 | arcane. See big big comment in VG_(client_syscall). |
| 110 | |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 111 | * First, it rounds up the syscall number and args (which is a |
| 112 | platform dependent activity) and puts them in a struct ("args") |
| 113 | and also a copy in "orig_args". |
| 114 | |
| 115 | The pre/post wrappers refer to these structs and so no longer |
| 116 | need magic macros to access any specific registers. This struct |
| 117 | is stored in thread-specific storage. |
| 118 | |
| 119 | |
| 120 | * The pre-wrapper is called, passing it a pointer to struct |
| 121 | "args". |
| 122 | |
| 123 | |
| 124 | * The pre-wrapper examines the args and pokes the tool |
| 125 | appropriately. It may modify the args; this is why "orig_args" |
| 126 | is also stored. |
| 127 | |
| 128 | The pre-wrapper may choose to 'do' the syscall itself, and |
| 129 | concludes one of three outcomes: |
| 130 | |
| 131 | Success(N) -- syscall is already complete, with success; |
| 132 | result is N |
| 133 | |
| 134 | Fail(N) -- syscall is already complete, with failure; |
| 135 | error code is N |
| 136 | |
| 137 | HandToKernel -- (the usual case): this needs to be given to |
| 138 | the kernel to be done, using the values in |
| 139 | the possibly-modified "args" struct. |
| 140 | |
| 141 | In addition, the pre-wrapper may set some flags: |
| 142 | |
| 143 | MayBlock -- only applicable when outcome==HandToKernel |
| 144 | |
| 145 | PostOnFail -- only applicable when outcome==HandToKernel or Fail |
| 146 | |
| 147 | |
| 148 | * If the pre-outcome is HandToKernel, the syscall is duly handed |
| 149 | off to the kernel (perhaps involving some thread switchery, but |
| 150 | that's not important). This reduces the possible set of outcomes |
| 151 | to either Success(N) or Fail(N). |
| 152 | |
| 153 | |
| 154 | * The outcome (Success(N) or Fail(N)) is written back to the guest |
| 155 | register(s). This is platform specific: |
| 156 | |
| 157 | x86: Success(N) ==> eax = N |
| 158 | Fail(N) ==> eax = -N |
| 159 | |
| 160 | ditto amd64 |
| 161 | |
| 162 | ppc32: Success(N) ==> r3 = N, CR0.SO = 0 |
| 163 | Fail(N) ==> r3 = N, CR0.SO = 1 |
| 164 | |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 165 | Darwin: |
| 166 | x86: Success(N) ==> edx:eax = N, cc = 0 |
| 167 | Fail(N) ==> edx:eax = N, cc = 1 |
| 168 | |
sewardj | b5b8740 | 2011-03-07 16:05:35 +0000 | [diff] [blame] | 169 | s390x: Success(N) ==> r2 = N |
| 170 | Fail(N) ==> r2 = -N |
| 171 | |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 172 | * The post wrapper is called if: |
| 173 | |
| 174 | - it exists, and |
| 175 | - outcome==Success or (outcome==Fail and PostOnFail is set) |
| 176 | |
| 177 | The post wrapper is passed the adulterated syscall args (struct |
| 178 | "args"), and the syscall outcome (viz, Success(N) or Fail(N)). |
| 179 | |
| 180 | There are several other complications, primarily to do with |
| 181 | syscalls getting interrupted, explained in comments in the code. |
| 182 | */ |
| 183 | |
| 184 | /* CAVEATS for writing wrappers. It is important to follow these! |
| 185 | |
| 186 | The macros defined in priv_types_n_macros.h are designed to help |
| 187 | decouple the wrapper logic from the actual representation of |
| 188 | syscall args/results, since these wrappers are designed to work on |
| 189 | multiple platforms. |
| 190 | |
| 191 | Sometimes a PRE wrapper will complete the syscall itself, without |
| 192 | handing it to the kernel. It will use one of SET_STATUS_Success, |
| 193 | SET_STATUS_Failure or SET_STATUS_from_SysRes to set the return |
| 194 | value. It is critical to appreciate that use of the macro does not |
| 195 | immediately cause the underlying guest state to be updated -- that |
| 196 | is done by the driver logic in this file, when the wrapper returns. |
| 197 | |
| 198 | As a result, PRE wrappers of the following form will malfunction: |
| 199 | |
| 200 | PRE(fooble) |
| 201 | { |
| 202 | ... do stuff ... |
| 203 | SET_STATUS_Somehow(...) |
| 204 | |
| 205 | // do something that assumes guest state is up to date |
| 206 | } |
| 207 | |
| 208 | In particular, direct or indirect calls to VG_(poll_signals) after |
| 209 | setting STATUS can cause the guest state to be read (in order to |
| 210 | build signal frames). Do not do this. If you want a signal poll |
| 211 | after the syscall goes through, do "*flags |= SfPollAfter" and the |
| 212 | driver logic will do it for you. |
sewardj | 45f4e7c | 2005-09-27 19:20:21 +0000 | [diff] [blame] | 213 | |
| 214 | ----------- |
| 215 | |
| 216 | Another critical requirement following introduction of new address |
| 217 | space manager (JRS, 20050923): |
| 218 | |
| 219 | In a situation where the mappedness of memory has changed, aspacem |
| 220 | should be notified BEFORE the tool. Hence the following is |
| 221 | correct: |
| 222 | |
| 223 | Bool d = VG_(am_notify_munmap)(s->start, s->end+1 - s->start); |
| 224 | VG_TRACK( die_mem_munmap, s->start, s->end+1 - s->start ); |
| 225 | if (d) |
| 226 | VG_(discard_translations)(s->start, s->end+1 - s->start); |
| 227 | |
| 228 | whilst this is wrong: |
| 229 | |
| 230 | VG_TRACK( die_mem_munmap, s->start, s->end+1 - s->start ); |
| 231 | Bool d = VG_(am_notify_munmap)(s->start, s->end+1 - s->start); |
| 232 | if (d) |
| 233 | VG_(discard_translations)(s->start, s->end+1 - s->start); |
| 234 | |
| 235 | The reason is that the tool may itself ask aspacem for more shadow |
| 236 | memory as a result of the VG_TRACK call. In such a situation it is |
| 237 | critical that aspacem's segment array is up to date -- hence the |
| 238 | need to notify aspacem first. |
| 239 | |
| 240 | ----------- |
| 241 | |
| 242 | Also .. take care to call VG_(discard_translations) whenever |
| 243 | memory with execute permissions is unmapped. |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 244 | */ |
| 245 | |
| 246 | |
| 247 | /* --------------------------------------------------------------------- |
| 248 | Do potentially blocking syscall for the client, and mess with |
| 249 | signal masks at the same time. |
| 250 | ------------------------------------------------------------------ */ |
| 251 | |
| 252 | /* Perform a syscall on behalf of a client thread, using a specific |
| 253 | signal mask. On completion, the signal mask is set to restore_mask |
| 254 | (which presumably blocks almost everything). If a signal happens |
| 255 | during the syscall, the handler should call |
| 256 | VG_(fixup_guest_state_after_syscall_interrupted) to adjust the |
| 257 | thread's context to do the right thing. |
| 258 | |
sewardj | 1b9cd1c | 2005-06-28 19:04:51 +0000 | [diff] [blame] | 259 | The _WRK function is handwritten assembly, implemented per-platform |
| 260 | in coregrind/m_syswrap/syscall-$PLAT.S. It has some very magic |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 261 | properties. See comments at the top of |
| 262 | VG_(fixup_guest_state_after_syscall_interrupted) below for details. |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 263 | |
| 264 | This function (these functions) are required to return zero in case |
| 265 | of success (even if the syscall itself failed), and nonzero if the |
| 266 | sigprocmask-swizzling calls failed. We don't actually care about |
| 267 | the failure values from sigprocmask, although most of the assembly |
| 268 | implementations do attempt to return that, using the convention |
| 269 | 0 for success, or 0x8000 | error-code for failure. |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 270 | */ |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 271 | #if defined(VGO_linux) |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 272 | extern |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 273 | UWord ML_(do_syscall_for_client_WRK)( Word syscallno, |
sewardj | 2537616 | 2005-12-22 19:28:37 +0000 | [diff] [blame] | 274 | void* guest_state, |
| 275 | const vki_sigset_t *syscall_mask, |
| 276 | const vki_sigset_t *restore_mask, |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 277 | Word sigsetSzB ); |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 278 | #elif defined(VGO_darwin) |
| 279 | extern |
| 280 | UWord ML_(do_syscall_for_client_unix_WRK)( Word syscallno, |
| 281 | void* guest_state, |
| 282 | const vki_sigset_t *syscall_mask, |
| 283 | const vki_sigset_t *restore_mask, |
| 284 | Word sigsetSzB ); /* unused */ |
| 285 | extern |
| 286 | UWord ML_(do_syscall_for_client_mach_WRK)( Word syscallno, |
| 287 | void* guest_state, |
| 288 | const vki_sigset_t *syscall_mask, |
| 289 | const vki_sigset_t *restore_mask, |
| 290 | Word sigsetSzB ); /* unused */ |
| 291 | extern |
| 292 | UWord ML_(do_syscall_for_client_mdep_WRK)( Word syscallno, |
| 293 | void* guest_state, |
| 294 | const vki_sigset_t *syscall_mask, |
| 295 | const vki_sigset_t *restore_mask, |
| 296 | Word sigsetSzB ); /* unused */ |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 297 | #else |
| 298 | # error "Unknown OS" |
| 299 | #endif |
| 300 | |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 301 | |
| 302 | static |
| 303 | void do_syscall_for_client ( Int syscallno, |
| 304 | ThreadState* tst, |
| 305 | const vki_sigset_t* syscall_mask ) |
| 306 | { |
| 307 | vki_sigset_t saved; |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 308 | UWord err; |
| 309 | # if defined(VGO_linux) |
| 310 | err = ML_(do_syscall_for_client_WRK)( |
| 311 | syscallno, &tst->arch.vex, |
| 312 | syscall_mask, &saved, sizeof(vki_sigset_t) |
| 313 | ); |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 314 | # elif defined(VGO_darwin) |
| 315 | switch (VG_DARWIN_SYSNO_CLASS(syscallno)) { |
| 316 | case VG_DARWIN_SYSCALL_CLASS_UNIX: |
| 317 | err = ML_(do_syscall_for_client_unix_WRK)( |
njn | 1a1e95c | 2009-06-03 06:50:06 +0000 | [diff] [blame] | 318 | VG_DARWIN_SYSNO_FOR_KERNEL(syscallno), &tst->arch.vex, |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 319 | syscall_mask, &saved, 0/*unused:sigsetSzB*/ |
| 320 | ); |
| 321 | break; |
| 322 | case VG_DARWIN_SYSCALL_CLASS_MACH: |
| 323 | err = ML_(do_syscall_for_client_mach_WRK)( |
njn | 1a1e95c | 2009-06-03 06:50:06 +0000 | [diff] [blame] | 324 | VG_DARWIN_SYSNO_FOR_KERNEL(syscallno), &tst->arch.vex, |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 325 | syscall_mask, &saved, 0/*unused:sigsetSzB*/ |
| 326 | ); |
| 327 | break; |
| 328 | case VG_DARWIN_SYSCALL_CLASS_MDEP: |
| 329 | err = ML_(do_syscall_for_client_mdep_WRK)( |
njn | 1a1e95c | 2009-06-03 06:50:06 +0000 | [diff] [blame] | 330 | VG_DARWIN_SYSNO_FOR_KERNEL(syscallno), &tst->arch.vex, |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 331 | syscall_mask, &saved, 0/*unused:sigsetSzB*/ |
| 332 | ); |
| 333 | break; |
| 334 | default: |
| 335 | vg_assert(0); |
| 336 | /*NOTREACHED*/ |
| 337 | break; |
| 338 | } |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 339 | # else |
| 340 | # error "Unknown OS" |
| 341 | # endif |
sewardj | 2537616 | 2005-12-22 19:28:37 +0000 | [diff] [blame] | 342 | vg_assert2( |
| 343 | err == 0, |
| 344 | "ML_(do_syscall_for_client_WRK): sigprocmask error %d", |
| 345 | (Int)(err & 0xFFF) |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 346 | ); |
| 347 | } |
| 348 | |
| 349 | |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 350 | /* --------------------------------------------------------------------- |
| 351 | Impedance matchers and misc helpers |
| 352 | ------------------------------------------------------------------ */ |
| 353 | |
| 354 | static |
| 355 | Bool eq_SyscallArgs ( SyscallArgs* a1, SyscallArgs* a2 ) |
| 356 | { |
| 357 | return a1->sysno == a2->sysno |
| 358 | && a1->arg1 == a2->arg1 |
| 359 | && a1->arg2 == a2->arg2 |
| 360 | && a1->arg3 == a2->arg3 |
| 361 | && a1->arg4 == a2->arg4 |
| 362 | && a1->arg5 == a2->arg5 |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 363 | && a1->arg6 == a2->arg6 |
| 364 | && a1->arg7 == a2->arg7 |
| 365 | && a1->arg8 == a2->arg8; |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 366 | } |
| 367 | |
| 368 | static |
| 369 | Bool eq_SyscallStatus ( SyscallStatus* s1, SyscallStatus* s2 ) |
| 370 | { |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 371 | /* was: return s1->what == s2->what && sr_EQ( s1->sres, s2->sres ); */ |
| 372 | if (s1->what == s2->what && sr_EQ( s1->sres, s2->sres )) |
| 373 | return True; |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 374 | # if defined(VGO_darwin) |
| 375 | /* Darwin-specific debugging guff */ |
| 376 | vg_assert(s1->what == s2->what); |
| 377 | VG_(printf)("eq_SyscallStatus:\n"); |
| 378 | VG_(printf)(" {%lu %lu %u}\n", s1->sres._wLO, s1->sres._wHI, s1->sres._mode); |
| 379 | VG_(printf)(" {%lu %lu %u}\n", s2->sres._wLO, s2->sres._wHI, s2->sres._mode); |
| 380 | vg_assert(0); |
| 381 | # endif |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 382 | return False; |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 383 | } |
| 384 | |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 385 | /* Convert between SysRes and SyscallStatus, to the extent possible. */ |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 386 | |
| 387 | static |
| 388 | SyscallStatus convert_SysRes_to_SyscallStatus ( SysRes res ) |
| 389 | { |
| 390 | SyscallStatus status; |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 391 | status.what = SsComplete; |
| 392 | status.sres = res; |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 393 | return status; |
| 394 | } |
| 395 | |
| 396 | |
| 397 | /* Impedance matchers. These convert syscall arg or result data from |
| 398 | the platform-specific in-guest-state format to the canonical |
| 399 | formats, and back. */ |
| 400 | |
| 401 | static |
| 402 | void getSyscallArgsFromGuestState ( /*OUT*/SyscallArgs* canonical, |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 403 | /*IN*/ VexGuestArchState* gst_vanilla, |
| 404 | /*IN*/ UInt trc ) |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 405 | { |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 406 | #if defined(VGP_x86_linux) |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 407 | VexGuestX86State* gst = (VexGuestX86State*)gst_vanilla; |
| 408 | canonical->sysno = gst->guest_EAX; |
| 409 | canonical->arg1 = gst->guest_EBX; |
| 410 | canonical->arg2 = gst->guest_ECX; |
| 411 | canonical->arg3 = gst->guest_EDX; |
| 412 | canonical->arg4 = gst->guest_ESI; |
| 413 | canonical->arg5 = gst->guest_EDI; |
| 414 | canonical->arg6 = gst->guest_EBP; |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 415 | canonical->arg7 = 0; |
| 416 | canonical->arg8 = 0; |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 417 | |
| 418 | #elif defined(VGP_amd64_linux) |
sewardj | e7aa4ae | 2005-06-09 12:43:42 +0000 | [diff] [blame] | 419 | VexGuestAMD64State* gst = (VexGuestAMD64State*)gst_vanilla; |
| 420 | canonical->sysno = gst->guest_RAX; |
| 421 | canonical->arg1 = gst->guest_RDI; |
| 422 | canonical->arg2 = gst->guest_RSI; |
| 423 | canonical->arg3 = gst->guest_RDX; |
| 424 | canonical->arg4 = gst->guest_R10; |
| 425 | canonical->arg5 = gst->guest_R8; |
| 426 | canonical->arg6 = gst->guest_R9; |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 427 | canonical->arg7 = 0; |
| 428 | canonical->arg8 = 0; |
| 429 | |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 430 | #elif defined(VGP_ppc32_linux) |
| 431 | VexGuestPPC32State* gst = (VexGuestPPC32State*)gst_vanilla; |
| 432 | canonical->sysno = gst->guest_GPR0; |
| 433 | canonical->arg1 = gst->guest_GPR3; |
| 434 | canonical->arg2 = gst->guest_GPR4; |
| 435 | canonical->arg3 = gst->guest_GPR5; |
| 436 | canonical->arg4 = gst->guest_GPR6; |
| 437 | canonical->arg5 = gst->guest_GPR7; |
| 438 | canonical->arg6 = gst->guest_GPR8; |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 439 | canonical->arg7 = 0; |
| 440 | canonical->arg8 = 0; |
| 441 | |
sewardj | 2c48c7b | 2005-11-29 13:05:56 +0000 | [diff] [blame] | 442 | #elif defined(VGP_ppc64_linux) |
| 443 | VexGuestPPC64State* gst = (VexGuestPPC64State*)gst_vanilla; |
| 444 | canonical->sysno = gst->guest_GPR0; |
| 445 | canonical->arg1 = gst->guest_GPR3; |
| 446 | canonical->arg2 = gst->guest_GPR4; |
| 447 | canonical->arg3 = gst->guest_GPR5; |
| 448 | canonical->arg4 = gst->guest_GPR6; |
| 449 | canonical->arg5 = gst->guest_GPR7; |
| 450 | canonical->arg6 = gst->guest_GPR8; |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 451 | canonical->arg7 = 0; |
| 452 | canonical->arg8 = 0; |
| 453 | |
sewardj | 59570ff | 2010-01-01 11:59:33 +0000 | [diff] [blame] | 454 | #elif defined(VGP_arm_linux) |
| 455 | VexGuestARMState* gst = (VexGuestARMState*)gst_vanilla; |
| 456 | canonical->sysno = gst->guest_R7; |
| 457 | canonical->arg1 = gst->guest_R0; |
| 458 | canonical->arg2 = gst->guest_R1; |
| 459 | canonical->arg3 = gst->guest_R2; |
| 460 | canonical->arg4 = gst->guest_R3; |
| 461 | canonical->arg5 = gst->guest_R4; |
| 462 | canonical->arg6 = gst->guest_R5; |
| 463 | canonical->arg7 = 0; |
| 464 | canonical->arg8 = 0; |
| 465 | |
sewardj | 5db1540 | 2012-06-07 09:13:21 +0000 | [diff] [blame] | 466 | #elif defined(VGP_mips32_linux) |
| 467 | VexGuestMIPS32State* gst = (VexGuestMIPS32State*)gst_vanilla; |
| 468 | canonical->sysno = gst->guest_r2; // v0 |
| 469 | if (canonical->sysno != __NR_syscall) { |
| 470 | canonical->arg1 = gst->guest_r4; // a0 |
| 471 | canonical->arg2 = gst->guest_r5; // a1 |
| 472 | canonical->arg3 = gst->guest_r6; // a2 |
| 473 | canonical->arg4 = gst->guest_r7; // a3 |
| 474 | canonical->arg5 = *((UInt*) (gst->guest_r29 + 16)); // 16(guest_SP/sp) |
| 475 | canonical->arg6 = *((UInt*) (gst->guest_r29 + 20)); // 20(sp) |
petarj | 44d2c2b | 2012-08-05 02:22:52 +0000 | [diff] [blame] | 476 | canonical->arg8 = 0; |
sewardj | 5db1540 | 2012-06-07 09:13:21 +0000 | [diff] [blame] | 477 | } else { |
| 478 | // Fixme hack handle syscall() |
| 479 | canonical->sysno = gst->guest_r4; // a0 |
| 480 | canonical->arg1 = gst->guest_r5; // a1 |
| 481 | canonical->arg2 = gst->guest_r6; // a2 |
| 482 | canonical->arg3 = gst->guest_r7; // a3 |
| 483 | canonical->arg4 = *((UInt*) (gst->guest_r29 + 16)); // 16(guest_SP/sp) |
| 484 | canonical->arg5 = *((UInt*) (gst->guest_r29 + 20)); // 20(guest_SP/sp) |
| 485 | canonical->arg6 = *((UInt*) (gst->guest_r29 + 24)); // 24(guest_SP/sp) |
petarj | 44d2c2b | 2012-08-05 02:22:52 +0000 | [diff] [blame] | 486 | canonical->arg8 = __NR_syscall; |
sewardj | 5db1540 | 2012-06-07 09:13:21 +0000 | [diff] [blame] | 487 | } |
| 488 | |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 489 | #elif defined(VGP_x86_darwin) |
| 490 | VexGuestX86State* gst = (VexGuestX86State*)gst_vanilla; |
| 491 | UWord *stack = (UWord *)gst->guest_ESP; |
| 492 | // GrP fixme hope syscalls aren't called with really shallow stacks... |
| 493 | canonical->sysno = gst->guest_EAX; |
| 494 | if (canonical->sysno != 0) { |
| 495 | // stack[0] is return address |
| 496 | canonical->arg1 = stack[1]; |
| 497 | canonical->arg2 = stack[2]; |
| 498 | canonical->arg3 = stack[3]; |
| 499 | canonical->arg4 = stack[4]; |
| 500 | canonical->arg5 = stack[5]; |
| 501 | canonical->arg6 = stack[6]; |
| 502 | canonical->arg7 = stack[7]; |
| 503 | canonical->arg8 = stack[8]; |
| 504 | } else { |
| 505 | // GrP fixme hack handle syscall() |
| 506 | // GrP fixme what about __syscall() ? |
| 507 | // stack[0] is return address |
| 508 | // DDD: the tool can't see that the params have been shifted! Can |
| 509 | // lead to incorrect checking, I think, because the PRRAn/PSARn |
| 510 | // macros will mention the pre-shifted args. |
| 511 | canonical->sysno = stack[1]; |
| 512 | vg_assert(canonical->sysno != 0); |
| 513 | canonical->arg1 = stack[2]; |
| 514 | canonical->arg2 = stack[3]; |
| 515 | canonical->arg3 = stack[4]; |
| 516 | canonical->arg4 = stack[5]; |
| 517 | canonical->arg5 = stack[6]; |
| 518 | canonical->arg6 = stack[7]; |
| 519 | canonical->arg7 = stack[8]; |
| 520 | canonical->arg8 = stack[9]; |
| 521 | |
njn | 1a1e95c | 2009-06-03 06:50:06 +0000 | [diff] [blame] | 522 | PRINT("SYSCALL[%d,?](%s) syscall(%s, ...); please stand by...\n", |
| 523 | VG_(getpid)(), /*tid,*/ |
| 524 | VG_SYSNUM_STRING(0), VG_SYSNUM_STRING(canonical->sysno)); |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 525 | } |
| 526 | |
njn | 1a1e95c | 2009-06-03 06:50:06 +0000 | [diff] [blame] | 527 | // Here we determine what kind of syscall it was by looking at the |
| 528 | // interrupt kind, and then encode the syscall number using the 64-bit |
| 529 | // encoding for Valgrind's internal use. |
| 530 | // |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 531 | // DDD: Would it be better to stash the JMP kind into the Darwin |
| 532 | // thread state rather than passing in the trc? |
| 533 | switch (trc) { |
| 534 | case VEX_TRC_JMP_SYS_INT128: |
| 535 | // int $0x80 = Unix, 64-bit result |
| 536 | vg_assert(canonical->sysno >= 0); |
| 537 | canonical->sysno = VG_DARWIN_SYSCALL_CONSTRUCT_UNIX(canonical->sysno); |
| 538 | break; |
| 539 | case VEX_TRC_JMP_SYS_SYSENTER: |
| 540 | // syscall = Unix, 32-bit result |
| 541 | // OR Mach, 32-bit result |
| 542 | if (canonical->sysno >= 0) { |
njn | 1a1e95c | 2009-06-03 06:50:06 +0000 | [diff] [blame] | 543 | // GrP fixme hack: 0xffff == I386_SYSCALL_NUMBER_MASK |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 544 | canonical->sysno = VG_DARWIN_SYSCALL_CONSTRUCT_UNIX(canonical->sysno |
| 545 | & 0xffff); |
| 546 | } else { |
| 547 | canonical->sysno = VG_DARWIN_SYSCALL_CONSTRUCT_MACH(-canonical->sysno); |
| 548 | } |
| 549 | break; |
| 550 | case VEX_TRC_JMP_SYS_INT129: |
| 551 | // int $0x81 = Mach, 32-bit result |
| 552 | vg_assert(canonical->sysno < 0); |
| 553 | canonical->sysno = VG_DARWIN_SYSCALL_CONSTRUCT_MACH(-canonical->sysno); |
| 554 | break; |
| 555 | case VEX_TRC_JMP_SYS_INT130: |
| 556 | // int $0x82 = mdep, 32-bit result |
| 557 | vg_assert(canonical->sysno >= 0); |
| 558 | canonical->sysno = VG_DARWIN_SYSCALL_CONSTRUCT_MDEP(canonical->sysno); |
| 559 | break; |
| 560 | default: |
| 561 | vg_assert(0); |
| 562 | break; |
| 563 | } |
| 564 | |
| 565 | #elif defined(VGP_amd64_darwin) |
| 566 | VexGuestAMD64State* gst = (VexGuestAMD64State*)gst_vanilla; |
| 567 | UWord *stack = (UWord *)gst->guest_RSP; |
| 568 | |
| 569 | vg_assert(trc == VEX_TRC_JMP_SYS_SYSCALL); |
| 570 | |
| 571 | // GrP fixme hope syscalls aren't called with really shallow stacks... |
| 572 | canonical->sysno = gst->guest_RAX; |
| 573 | if (canonical->sysno != __NR_syscall) { |
| 574 | // stack[0] is return address |
| 575 | canonical->arg1 = gst->guest_RDI; |
| 576 | canonical->arg2 = gst->guest_RSI; |
| 577 | canonical->arg3 = gst->guest_RDX; |
| 578 | canonical->arg4 = gst->guest_R10; // not rcx with syscall insn |
| 579 | canonical->arg5 = gst->guest_R8; |
| 580 | canonical->arg6 = gst->guest_R9; |
| 581 | canonical->arg7 = stack[1]; |
| 582 | canonical->arg8 = stack[2]; |
| 583 | } else { |
| 584 | // GrP fixme hack handle syscall() |
| 585 | // GrP fixme what about __syscall() ? |
| 586 | // stack[0] is return address |
| 587 | // DDD: the tool can't see that the params have been shifted! Can |
| 588 | // lead to incorrect checking, I think, because the PRRAn/PSARn |
| 589 | // macros will mention the pre-shifted args. |
| 590 | canonical->sysno = VG_DARWIN_SYSCALL_CONSTRUCT_UNIX(gst->guest_RDI); |
| 591 | vg_assert(canonical->sysno != __NR_syscall); |
| 592 | canonical->arg1 = gst->guest_RSI; |
| 593 | canonical->arg2 = gst->guest_RDX; |
| 594 | canonical->arg3 = gst->guest_R10; // not rcx with syscall insn |
| 595 | canonical->arg4 = gst->guest_R8; |
| 596 | canonical->arg5 = gst->guest_R9; |
| 597 | canonical->arg6 = stack[1]; |
| 598 | canonical->arg7 = stack[2]; |
| 599 | canonical->arg8 = stack[3]; |
| 600 | |
njn | 1a1e95c | 2009-06-03 06:50:06 +0000 | [diff] [blame] | 601 | PRINT("SYSCALL[%d,?](%s) syscall(%s, ...); please stand by...\n", |
| 602 | VG_(getpid)(), /*tid,*/ |
| 603 | VG_SYSNUM_STRING(0), VG_SYSNUM_STRING(canonical->sysno)); |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 604 | } |
| 605 | |
| 606 | // no canonical->sysno adjustment needed |
| 607 | |
sewardj | b5b8740 | 2011-03-07 16:05:35 +0000 | [diff] [blame] | 608 | #elif defined(VGP_s390x_linux) |
| 609 | VexGuestS390XState* gst = (VexGuestS390XState*)gst_vanilla; |
| 610 | canonical->sysno = gst->guest_SYSNO; |
| 611 | canonical->arg1 = gst->guest_r2; |
| 612 | canonical->arg2 = gst->guest_r3; |
| 613 | canonical->arg3 = gst->guest_r4; |
| 614 | canonical->arg4 = gst->guest_r5; |
| 615 | canonical->arg5 = gst->guest_r6; |
| 616 | canonical->arg6 = gst->guest_r7; |
| 617 | canonical->arg7 = 0; |
| 618 | canonical->arg8 = 0; |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 619 | #else |
| 620 | # error "getSyscallArgsFromGuestState: unknown arch" |
| 621 | #endif |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 622 | } |
| 623 | |
| 624 | static |
| 625 | void putSyscallArgsIntoGuestState ( /*IN*/ SyscallArgs* canonical, |
| 626 | /*OUT*/VexGuestArchState* gst_vanilla ) |
| 627 | { |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 628 | #if defined(VGP_x86_linux) |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 629 | VexGuestX86State* gst = (VexGuestX86State*)gst_vanilla; |
| 630 | gst->guest_EAX = canonical->sysno; |
| 631 | gst->guest_EBX = canonical->arg1; |
| 632 | gst->guest_ECX = canonical->arg2; |
| 633 | gst->guest_EDX = canonical->arg3; |
| 634 | gst->guest_ESI = canonical->arg4; |
| 635 | gst->guest_EDI = canonical->arg5; |
| 636 | gst->guest_EBP = canonical->arg6; |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 637 | |
| 638 | #elif defined(VGP_amd64_linux) |
sewardj | e7aa4ae | 2005-06-09 12:43:42 +0000 | [diff] [blame] | 639 | VexGuestAMD64State* gst = (VexGuestAMD64State*)gst_vanilla; |
| 640 | gst->guest_RAX = canonical->sysno; |
| 641 | gst->guest_RDI = canonical->arg1; |
| 642 | gst->guest_RSI = canonical->arg2; |
| 643 | gst->guest_RDX = canonical->arg3; |
| 644 | gst->guest_R10 = canonical->arg4; |
| 645 | gst->guest_R8 = canonical->arg5; |
| 646 | gst->guest_R9 = canonical->arg6; |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 647 | |
| 648 | #elif defined(VGP_ppc32_linux) |
| 649 | VexGuestPPC32State* gst = (VexGuestPPC32State*)gst_vanilla; |
| 650 | gst->guest_GPR0 = canonical->sysno; |
| 651 | gst->guest_GPR3 = canonical->arg1; |
| 652 | gst->guest_GPR4 = canonical->arg2; |
| 653 | gst->guest_GPR5 = canonical->arg3; |
| 654 | gst->guest_GPR6 = canonical->arg4; |
| 655 | gst->guest_GPR7 = canonical->arg5; |
| 656 | gst->guest_GPR8 = canonical->arg6; |
| 657 | |
sewardj | 2c48c7b | 2005-11-29 13:05:56 +0000 | [diff] [blame] | 658 | #elif defined(VGP_ppc64_linux) |
| 659 | VexGuestPPC64State* gst = (VexGuestPPC64State*)gst_vanilla; |
| 660 | gst->guest_GPR0 = canonical->sysno; |
| 661 | gst->guest_GPR3 = canonical->arg1; |
| 662 | gst->guest_GPR4 = canonical->arg2; |
| 663 | gst->guest_GPR5 = canonical->arg3; |
| 664 | gst->guest_GPR6 = canonical->arg4; |
| 665 | gst->guest_GPR7 = canonical->arg5; |
| 666 | gst->guest_GPR8 = canonical->arg6; |
| 667 | |
sewardj | 59570ff | 2010-01-01 11:59:33 +0000 | [diff] [blame] | 668 | #elif defined(VGP_arm_linux) |
| 669 | VexGuestARMState* gst = (VexGuestARMState*)gst_vanilla; |
| 670 | gst->guest_R7 = canonical->sysno; |
| 671 | gst->guest_R0 = canonical->arg1; |
| 672 | gst->guest_R1 = canonical->arg2; |
| 673 | gst->guest_R2 = canonical->arg3; |
| 674 | gst->guest_R3 = canonical->arg4; |
| 675 | gst->guest_R4 = canonical->arg5; |
| 676 | gst->guest_R5 = canonical->arg6; |
| 677 | |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 678 | #elif defined(VGP_x86_darwin) |
| 679 | VexGuestX86State* gst = (VexGuestX86State*)gst_vanilla; |
| 680 | UWord *stack = (UWord *)gst->guest_ESP; |
| 681 | |
njn | 1a1e95c | 2009-06-03 06:50:06 +0000 | [diff] [blame] | 682 | gst->guest_EAX = VG_DARWIN_SYSNO_FOR_KERNEL(canonical->sysno); |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 683 | |
| 684 | // GrP fixme? gst->guest_TEMP_EFLAG_C = 0; |
| 685 | // stack[0] is return address |
| 686 | stack[1] = canonical->arg1; |
| 687 | stack[2] = canonical->arg2; |
| 688 | stack[3] = canonical->arg3; |
| 689 | stack[4] = canonical->arg4; |
| 690 | stack[5] = canonical->arg5; |
| 691 | stack[6] = canonical->arg6; |
| 692 | stack[7] = canonical->arg7; |
| 693 | stack[8] = canonical->arg8; |
| 694 | |
| 695 | #elif defined(VGP_amd64_darwin) |
| 696 | VexGuestAMD64State* gst = (VexGuestAMD64State*)gst_vanilla; |
| 697 | UWord *stack = (UWord *)gst->guest_RSP; |
| 698 | |
njn | 1a1e95c | 2009-06-03 06:50:06 +0000 | [diff] [blame] | 699 | gst->guest_RAX = VG_DARWIN_SYSNO_FOR_KERNEL(canonical->sysno); |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 700 | // GrP fixme? gst->guest_TEMP_EFLAG_C = 0; |
| 701 | |
| 702 | // stack[0] is return address |
| 703 | gst->guest_RDI = canonical->arg1; |
| 704 | gst->guest_RSI = canonical->arg2; |
| 705 | gst->guest_RDX = canonical->arg3; |
| 706 | gst->guest_RCX = canonical->arg4; |
| 707 | gst->guest_R8 = canonical->arg5; |
| 708 | gst->guest_R9 = canonical->arg6; |
| 709 | stack[1] = canonical->arg7; |
| 710 | stack[2] = canonical->arg8; |
| 711 | |
sewardj | b5b8740 | 2011-03-07 16:05:35 +0000 | [diff] [blame] | 712 | #elif defined(VGP_s390x_linux) |
| 713 | VexGuestS390XState* gst = (VexGuestS390XState*)gst_vanilla; |
| 714 | gst->guest_SYSNO = canonical->sysno; |
| 715 | gst->guest_r2 = canonical->arg1; |
| 716 | gst->guest_r3 = canonical->arg2; |
| 717 | gst->guest_r4 = canonical->arg3; |
| 718 | gst->guest_r5 = canonical->arg4; |
| 719 | gst->guest_r6 = canonical->arg5; |
| 720 | gst->guest_r7 = canonical->arg6; |
| 721 | |
sewardj | 5db1540 | 2012-06-07 09:13:21 +0000 | [diff] [blame] | 722 | #elif defined(VGP_mips32_linux) |
| 723 | VexGuestMIPS32State* gst = (VexGuestMIPS32State*)gst_vanilla; |
petarj | 44d2c2b | 2012-08-05 02:22:52 +0000 | [diff] [blame] | 724 | if (canonical->arg8 != __NR_syscall) { |
| 725 | gst->guest_r2 = canonical->sysno; |
| 726 | gst->guest_r4 = canonical->arg1; |
| 727 | gst->guest_r5 = canonical->arg2; |
| 728 | gst->guest_r6 = canonical->arg3; |
| 729 | gst->guest_r7 = canonical->arg4; |
| 730 | *((UInt*) (gst->guest_r29 + 16)) = canonical->arg5; // 16(guest_GPR29/sp) |
| 731 | *((UInt*) (gst->guest_r29 + 20)) = canonical->arg6; // 20(sp) |
| 732 | } else { |
| 733 | canonical->arg8 = 0; |
| 734 | gst->guest_r2 = __NR_syscall; |
| 735 | gst->guest_r4 = canonical->sysno; |
| 736 | gst->guest_r5 = canonical->arg1; |
| 737 | gst->guest_r6 = canonical->arg2; |
| 738 | gst->guest_r7 = canonical->arg3; |
| 739 | *((UInt*) (gst->guest_r29 + 16)) = canonical->arg4; // 16(guest_GPR29/sp) |
| 740 | *((UInt*) (gst->guest_r29 + 20)) = canonical->arg5; // 20(sp) |
| 741 | *((UInt*) (gst->guest_r29 + 24)) = canonical->arg6; // 24(sp) |
| 742 | } |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 743 | #else |
| 744 | # error "putSyscallArgsIntoGuestState: unknown arch" |
| 745 | #endif |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 746 | } |
| 747 | |
| 748 | static |
| 749 | void getSyscallStatusFromGuestState ( /*OUT*/SyscallStatus* canonical, |
| 750 | /*IN*/ VexGuestArchState* gst_vanilla ) |
| 751 | { |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 752 | # if defined(VGP_x86_linux) |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 753 | VexGuestX86State* gst = (VexGuestX86State*)gst_vanilla; |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 754 | canonical->sres = VG_(mk_SysRes_x86_linux)( gst->guest_EAX ); |
| 755 | canonical->what = SsComplete; |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 756 | |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 757 | # elif defined(VGP_amd64_linux) |
sewardj | e7aa4ae | 2005-06-09 12:43:42 +0000 | [diff] [blame] | 758 | VexGuestAMD64State* gst = (VexGuestAMD64State*)gst_vanilla; |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 759 | canonical->sres = VG_(mk_SysRes_amd64_linux)( gst->guest_RAX ); |
| 760 | canonical->what = SsComplete; |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 761 | |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 762 | # elif defined(VGP_ppc32_linux) |
| 763 | VexGuestPPC32State* gst = (VexGuestPPC32State*)gst_vanilla; |
| 764 | UInt cr = LibVEX_GuestPPC32_get_CR( gst ); |
| 765 | UInt cr0so = (cr >> 28) & 1; |
| 766 | canonical->sres = VG_(mk_SysRes_ppc32_linux)( gst->guest_GPR3, cr0so ); |
| 767 | canonical->what = SsComplete; |
| 768 | |
| 769 | # elif defined(VGP_ppc64_linux) |
| 770 | VexGuestPPC64State* gst = (VexGuestPPC64State*)gst_vanilla; |
| 771 | UInt cr = LibVEX_GuestPPC64_get_CR( gst ); |
| 772 | UInt cr0so = (cr >> 28) & 1; |
| 773 | canonical->sres = VG_(mk_SysRes_ppc64_linux)( gst->guest_GPR3, cr0so ); |
| 774 | canonical->what = SsComplete; |
| 775 | |
sewardj | 59570ff | 2010-01-01 11:59:33 +0000 | [diff] [blame] | 776 | # elif defined(VGP_arm_linux) |
| 777 | VexGuestARMState* gst = (VexGuestARMState*)gst_vanilla; |
| 778 | canonical->sres = VG_(mk_SysRes_arm_linux)( gst->guest_R0 ); |
| 779 | canonical->what = SsComplete; |
| 780 | |
sewardj | 5db1540 | 2012-06-07 09:13:21 +0000 | [diff] [blame] | 781 | # elif defined(VGP_mips32_linux) |
| 782 | VexGuestMIPS32State* gst = (VexGuestMIPS32State*)gst_vanilla; |
| 783 | UInt v0 = gst->guest_r2; // v0 |
| 784 | UInt v1 = gst->guest_r3; // v1 |
| 785 | UInt a3 = gst->guest_r7; // a3 |
| 786 | canonical->sres = VG_(mk_SysRes_mips32_linux)( v0, v1, a3 ); |
| 787 | canonical->what = SsComplete; |
| 788 | |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 789 | # elif defined(VGP_x86_darwin) |
| 790 | /* duplicates logic in m_signals.VG_UCONTEXT_SYSCALL_SYSRES */ |
| 791 | VexGuestX86State* gst = (VexGuestX86State*)gst_vanilla; |
| 792 | UInt carry = 1 & LibVEX_GuestX86_get_eflags(gst); |
| 793 | UInt err = 0; |
| 794 | UInt wLO = 0; |
| 795 | UInt wHI = 0; |
| 796 | switch (gst->guest_SC_CLASS) { |
| 797 | case VG_DARWIN_SYSCALL_CLASS_UNIX: |
| 798 | // int $0x80 = Unix, 64-bit result |
| 799 | err = carry; |
| 800 | wLO = gst->guest_EAX; |
| 801 | wHI = gst->guest_EDX; |
| 802 | break; |
| 803 | case VG_DARWIN_SYSCALL_CLASS_MACH: |
| 804 | // int $0x81 = Mach, 32-bit result |
| 805 | wLO = gst->guest_EAX; |
| 806 | break; |
| 807 | case VG_DARWIN_SYSCALL_CLASS_MDEP: |
| 808 | // int $0x82 = mdep, 32-bit result |
| 809 | wLO = gst->guest_EAX; |
| 810 | break; |
| 811 | default: |
| 812 | vg_assert(0); |
| 813 | break; |
| 814 | } |
| 815 | canonical->sres = VG_(mk_SysRes_x86_darwin)( |
| 816 | gst->guest_SC_CLASS, err ? True : False, |
| 817 | wHI, wLO |
| 818 | ); |
| 819 | canonical->what = SsComplete; |
| 820 | |
| 821 | # elif defined(VGP_amd64_darwin) |
| 822 | /* duplicates logic in m_signals.VG_UCONTEXT_SYSCALL_SYSRES */ |
| 823 | VexGuestAMD64State* gst = (VexGuestAMD64State*)gst_vanilla; |
| 824 | ULong carry = 1 & LibVEX_GuestAMD64_get_rflags(gst); |
| 825 | ULong err = 0; |
| 826 | ULong wLO = 0; |
| 827 | ULong wHI = 0; |
| 828 | switch (gst->guest_SC_CLASS) { |
| 829 | case VG_DARWIN_SYSCALL_CLASS_UNIX: |
| 830 | // syscall = Unix, 128-bit result |
| 831 | err = carry; |
| 832 | wLO = gst->guest_RAX; |
| 833 | wHI = gst->guest_RDX; |
| 834 | break; |
| 835 | case VG_DARWIN_SYSCALL_CLASS_MACH: |
| 836 | // syscall = Mach, 64-bit result |
| 837 | wLO = gst->guest_RAX; |
| 838 | break; |
| 839 | case VG_DARWIN_SYSCALL_CLASS_MDEP: |
| 840 | // syscall = mdep, 64-bit result |
| 841 | wLO = gst->guest_RAX; |
| 842 | break; |
| 843 | default: |
| 844 | vg_assert(0); |
| 845 | break; |
| 846 | } |
| 847 | canonical->sres = VG_(mk_SysRes_amd64_darwin)( |
| 848 | gst->guest_SC_CLASS, err ? True : False, |
| 849 | wHI, wLO |
| 850 | ); |
| 851 | canonical->what = SsComplete; |
| 852 | |
sewardj | b5b8740 | 2011-03-07 16:05:35 +0000 | [diff] [blame] | 853 | # elif defined(VGP_s390x_linux) |
| 854 | VexGuestS390XState* gst = (VexGuestS390XState*)gst_vanilla; |
| 855 | canonical->sres = VG_(mk_SysRes_s390x_linux)( gst->guest_r2 ); |
| 856 | canonical->what = SsComplete; |
| 857 | |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 858 | # else |
| 859 | # error "getSyscallStatusFromGuestState: unknown arch" |
| 860 | # endif |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 861 | } |
| 862 | |
| 863 | static |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 864 | void putSyscallStatusIntoGuestState ( /*IN*/ ThreadId tid, |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 865 | /*IN*/ SyscallStatus* canonical, |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 866 | /*OUT*/VexGuestArchState* gst_vanilla ) |
| 867 | { |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 868 | # if defined(VGP_x86_linux) |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 869 | VexGuestX86State* gst = (VexGuestX86State*)gst_vanilla; |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 870 | vg_assert(canonical->what == SsComplete); |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 871 | if (sr_isError(canonical->sres)) { |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 872 | /* This isn't exactly right, in that really a Failure with res |
| 873 | not in the range 1 .. 4095 is unrepresentable in the |
| 874 | Linux-x86 scheme. Oh well. */ |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 875 | gst->guest_EAX = - (Int)sr_Err(canonical->sres); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 876 | } else { |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 877 | gst->guest_EAX = sr_Res(canonical->sres); |
sewardj | e7aa4ae | 2005-06-09 12:43:42 +0000 | [diff] [blame] | 878 | } |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 879 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 880 | OFFSET_x86_EAX, sizeof(UWord) ); |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 881 | |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 882 | # elif defined(VGP_amd64_linux) |
| 883 | VexGuestAMD64State* gst = (VexGuestAMD64State*)gst_vanilla; |
| 884 | vg_assert(canonical->what == SsComplete); |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 885 | if (sr_isError(canonical->sres)) { |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 886 | /* This isn't exactly right, in that really a Failure with res |
| 887 | not in the range 1 .. 4095 is unrepresentable in the |
sewardj | 59570ff | 2010-01-01 11:59:33 +0000 | [diff] [blame] | 888 | Linux-amd64 scheme. Oh well. */ |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 889 | gst->guest_RAX = - (Long)sr_Err(canonical->sres); |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 890 | } else { |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 891 | gst->guest_RAX = sr_Res(canonical->sres); |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 892 | } |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 893 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 894 | OFFSET_amd64_RAX, sizeof(UWord) ); |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 895 | |
| 896 | # elif defined(VGP_ppc32_linux) |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 897 | VexGuestPPC32State* gst = (VexGuestPPC32State*)gst_vanilla; |
sewardj | 463b3d9 | 2005-07-18 11:41:15 +0000 | [diff] [blame] | 898 | UInt old_cr = LibVEX_GuestPPC32_get_CR(gst); |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 899 | vg_assert(canonical->what == SsComplete); |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 900 | if (sr_isError(canonical->sres)) { |
sewardj | 463b3d9 | 2005-07-18 11:41:15 +0000 | [diff] [blame] | 901 | /* set CR0.SO */ |
| 902 | LibVEX_GuestPPC32_put_CR( old_cr | (1<<28), gst ); |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 903 | gst->guest_GPR3 = sr_Err(canonical->sres); |
sewardj | 463b3d9 | 2005-07-18 11:41:15 +0000 | [diff] [blame] | 904 | } else { |
| 905 | /* clear CR0.SO */ |
| 906 | LibVEX_GuestPPC32_put_CR( old_cr & ~(1<<28), gst ); |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 907 | gst->guest_GPR3 = sr_Res(canonical->sres); |
sewardj | 463b3d9 | 2005-07-18 11:41:15 +0000 | [diff] [blame] | 908 | } |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 909 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 910 | OFFSET_ppc32_GPR3, sizeof(UWord) ); |
| 911 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 912 | OFFSET_ppc32_CR0_0, sizeof(UChar) ); |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 913 | |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 914 | # elif defined(VGP_ppc64_linux) |
sewardj | 2c48c7b | 2005-11-29 13:05:56 +0000 | [diff] [blame] | 915 | VexGuestPPC64State* gst = (VexGuestPPC64State*)gst_vanilla; |
| 916 | UInt old_cr = LibVEX_GuestPPC64_get_CR(gst); |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 917 | vg_assert(canonical->what == SsComplete); |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 918 | if (sr_isError(canonical->sres)) { |
sewardj | 2c48c7b | 2005-11-29 13:05:56 +0000 | [diff] [blame] | 919 | /* set CR0.SO */ |
| 920 | LibVEX_GuestPPC64_put_CR( old_cr | (1<<28), gst ); |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 921 | gst->guest_GPR3 = sr_Err(canonical->sres); |
sewardj | 2c48c7b | 2005-11-29 13:05:56 +0000 | [diff] [blame] | 922 | } else { |
| 923 | /* clear CR0.SO */ |
| 924 | LibVEX_GuestPPC64_put_CR( old_cr & ~(1<<28), gst ); |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 925 | gst->guest_GPR3 = sr_Res(canonical->sres); |
sewardj | 2c48c7b | 2005-11-29 13:05:56 +0000 | [diff] [blame] | 926 | } |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 927 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 928 | OFFSET_ppc64_GPR3, sizeof(UWord) ); |
| 929 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 930 | OFFSET_ppc64_CR0_0, sizeof(UChar) ); |
sewardj | 2c48c7b | 2005-11-29 13:05:56 +0000 | [diff] [blame] | 931 | |
sewardj | 59570ff | 2010-01-01 11:59:33 +0000 | [diff] [blame] | 932 | # elif defined(VGP_arm_linux) |
| 933 | VexGuestARMState* gst = (VexGuestARMState*)gst_vanilla; |
| 934 | vg_assert(canonical->what == SsComplete); |
| 935 | if (sr_isError(canonical->sres)) { |
| 936 | /* This isn't exactly right, in that really a Failure with res |
| 937 | not in the range 1 .. 4095 is unrepresentable in the |
| 938 | Linux-arm scheme. Oh well. */ |
| 939 | gst->guest_R0 = - (Int)sr_Err(canonical->sres); |
| 940 | } else { |
| 941 | gst->guest_R0 = sr_Res(canonical->sres); |
| 942 | } |
| 943 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 944 | OFFSET_arm_R0, sizeof(UWord) ); |
| 945 | |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 946 | #elif defined(VGP_x86_darwin) |
| 947 | VexGuestX86State* gst = (VexGuestX86State*)gst_vanilla; |
| 948 | SysRes sres = canonical->sres; |
| 949 | vg_assert(canonical->what == SsComplete); |
| 950 | /* Unfortunately here we have to break abstraction and look |
| 951 | directly inside 'res', in order to decide what to do. */ |
| 952 | switch (sres._mode) { |
| 953 | case SysRes_MACH: // int $0x81 = Mach, 32-bit result |
| 954 | case SysRes_MDEP: // int $0x82 = mdep, 32-bit result |
| 955 | gst->guest_EAX = sres._wLO; |
| 956 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 957 | OFFSET_x86_EAX, sizeof(UInt) ); |
| 958 | break; |
| 959 | case SysRes_UNIX_OK: // int $0x80 = Unix, 64-bit result |
| 960 | case SysRes_UNIX_ERR: // int $0x80 = Unix, 64-bit error |
| 961 | gst->guest_EAX = sres._wLO; |
| 962 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 963 | OFFSET_x86_EAX, sizeof(UInt) ); |
| 964 | gst->guest_EDX = sres._wHI; |
| 965 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 966 | OFFSET_x86_EDX, sizeof(UInt) ); |
| 967 | LibVEX_GuestX86_put_eflag_c( sres._mode==SysRes_UNIX_ERR ? 1 : 0, |
| 968 | gst ); |
| 969 | // GrP fixme sets defined for entire eflags, not just bit c |
| 970 | // DDD: this breaks exp-ptrcheck. |
| 971 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 972 | offsetof(VexGuestX86State, guest_CC_DEP1), sizeof(UInt) ); |
| 973 | break; |
| 974 | default: |
| 975 | vg_assert(0); |
| 976 | break; |
| 977 | } |
| 978 | |
| 979 | #elif defined(VGP_amd64_darwin) |
| 980 | VexGuestAMD64State* gst = (VexGuestAMD64State*)gst_vanilla; |
| 981 | SysRes sres = canonical->sres; |
| 982 | vg_assert(canonical->what == SsComplete); |
| 983 | /* Unfortunately here we have to break abstraction and look |
| 984 | directly inside 'res', in order to decide what to do. */ |
| 985 | switch (sres._mode) { |
| 986 | case SysRes_MACH: // syscall = Mach, 64-bit result |
| 987 | case SysRes_MDEP: // syscall = mdep, 64-bit result |
| 988 | gst->guest_RAX = sres._wLO; |
| 989 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 990 | OFFSET_amd64_RAX, sizeof(ULong) ); |
| 991 | break; |
| 992 | case SysRes_UNIX_OK: // syscall = Unix, 128-bit result |
| 993 | case SysRes_UNIX_ERR: // syscall = Unix, 128-bit error |
| 994 | gst->guest_RAX = sres._wLO; |
| 995 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 996 | OFFSET_amd64_RAX, sizeof(ULong) ); |
| 997 | gst->guest_RDX = sres._wHI; |
| 998 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 999 | OFFSET_amd64_RDX, sizeof(ULong) ); |
| 1000 | LibVEX_GuestAMD64_put_rflag_c( sres._mode==SysRes_UNIX_ERR ? 1 : 0, |
| 1001 | gst ); |
| 1002 | // GrP fixme sets defined for entire rflags, not just bit c |
| 1003 | // DDD: this breaks exp-ptrcheck. |
| 1004 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 1005 | offsetof(VexGuestAMD64State, guest_CC_DEP1), sizeof(ULong) ); |
| 1006 | break; |
| 1007 | default: |
| 1008 | vg_assert(0); |
| 1009 | break; |
| 1010 | } |
| 1011 | |
sewardj | b5b8740 | 2011-03-07 16:05:35 +0000 | [diff] [blame] | 1012 | # elif defined(VGP_s390x_linux) |
| 1013 | VexGuestS390XState* gst = (VexGuestS390XState*)gst_vanilla; |
| 1014 | vg_assert(canonical->what == SsComplete); |
| 1015 | if (sr_isError(canonical->sres)) { |
| 1016 | gst->guest_r2 = - (Long)sr_Err(canonical->sres); |
| 1017 | } else { |
| 1018 | gst->guest_r2 = sr_Res(canonical->sres); |
| 1019 | } |
| 1020 | |
sewardj | 5db1540 | 2012-06-07 09:13:21 +0000 | [diff] [blame] | 1021 | # elif defined(VGP_mips32_linux) |
| 1022 | VexGuestMIPS32State* gst = (VexGuestMIPS32State*)gst_vanilla; |
| 1023 | vg_assert(canonical->what == SsComplete); |
| 1024 | if (sr_isError(canonical->sres)) { |
| 1025 | gst->guest_r2 = (Int)sr_Err(canonical->sres); |
| 1026 | gst->guest_r7 = (Int)sr_Err(canonical->sres); |
| 1027 | } else { |
| 1028 | gst->guest_r2 = sr_Res(canonical->sres); |
| 1029 | gst->guest_r3 = sr_ResEx(canonical->sres); |
| 1030 | gst->guest_r7 = (Int)sr_Err(canonical->sres); |
| 1031 | } |
| 1032 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 1033 | OFFSET_mips32_r2, sizeof(UWord) ); |
| 1034 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 1035 | OFFSET_mips32_r3, sizeof(UWord) ); |
| 1036 | VG_TRACK( post_reg_write, Vg_CoreSysCall, tid, |
| 1037 | OFFSET_mips32_r7, sizeof(UWord) ); |
| 1038 | |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 1039 | # else |
| 1040 | # error "putSyscallStatusIntoGuestState: unknown arch" |
| 1041 | # endif |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1042 | } |
| 1043 | |
| 1044 | |
| 1045 | /* Tell me the offsets in the guest state of the syscall params, so |
| 1046 | that the scalar argument checkers don't have to have this info |
| 1047 | hardwired. */ |
| 1048 | |
| 1049 | static |
| 1050 | void getSyscallArgLayout ( /*OUT*/SyscallArgLayout* layout ) |
| 1051 | { |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 1052 | #if defined(VGP_x86_linux) |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1053 | layout->o_sysno = OFFSET_x86_EAX; |
| 1054 | layout->o_arg1 = OFFSET_x86_EBX; |
| 1055 | layout->o_arg2 = OFFSET_x86_ECX; |
| 1056 | layout->o_arg3 = OFFSET_x86_EDX; |
| 1057 | layout->o_arg4 = OFFSET_x86_ESI; |
| 1058 | layout->o_arg5 = OFFSET_x86_EDI; |
| 1059 | layout->o_arg6 = OFFSET_x86_EBP; |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 1060 | layout->uu_arg7 = -1; /* impossible value */ |
| 1061 | layout->uu_arg8 = -1; /* impossible value */ |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 1062 | |
| 1063 | #elif defined(VGP_amd64_linux) |
sewardj | e7aa4ae | 2005-06-09 12:43:42 +0000 | [diff] [blame] | 1064 | layout->o_sysno = OFFSET_amd64_RAX; |
| 1065 | layout->o_arg1 = OFFSET_amd64_RDI; |
| 1066 | layout->o_arg2 = OFFSET_amd64_RSI; |
| 1067 | layout->o_arg3 = OFFSET_amd64_RDX; |
| 1068 | layout->o_arg4 = OFFSET_amd64_R10; |
| 1069 | layout->o_arg5 = OFFSET_amd64_R8; |
| 1070 | layout->o_arg6 = OFFSET_amd64_R9; |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 1071 | layout->uu_arg7 = -1; /* impossible value */ |
| 1072 | layout->uu_arg8 = -1; /* impossible value */ |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 1073 | |
| 1074 | #elif defined(VGP_ppc32_linux) |
| 1075 | layout->o_sysno = OFFSET_ppc32_GPR0; |
| 1076 | layout->o_arg1 = OFFSET_ppc32_GPR3; |
| 1077 | layout->o_arg2 = OFFSET_ppc32_GPR4; |
| 1078 | layout->o_arg3 = OFFSET_ppc32_GPR5; |
| 1079 | layout->o_arg4 = OFFSET_ppc32_GPR6; |
| 1080 | layout->o_arg5 = OFFSET_ppc32_GPR7; |
| 1081 | layout->o_arg6 = OFFSET_ppc32_GPR8; |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 1082 | layout->uu_arg7 = -1; /* impossible value */ |
| 1083 | layout->uu_arg8 = -1; /* impossible value */ |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 1084 | |
sewardj | 2c48c7b | 2005-11-29 13:05:56 +0000 | [diff] [blame] | 1085 | #elif defined(VGP_ppc64_linux) |
| 1086 | layout->o_sysno = OFFSET_ppc64_GPR0; |
| 1087 | layout->o_arg1 = OFFSET_ppc64_GPR3; |
| 1088 | layout->o_arg2 = OFFSET_ppc64_GPR4; |
| 1089 | layout->o_arg3 = OFFSET_ppc64_GPR5; |
| 1090 | layout->o_arg4 = OFFSET_ppc64_GPR6; |
| 1091 | layout->o_arg5 = OFFSET_ppc64_GPR7; |
| 1092 | layout->o_arg6 = OFFSET_ppc64_GPR8; |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 1093 | layout->uu_arg7 = -1; /* impossible value */ |
| 1094 | layout->uu_arg8 = -1; /* impossible value */ |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 1095 | |
sewardj | 59570ff | 2010-01-01 11:59:33 +0000 | [diff] [blame] | 1096 | #elif defined(VGP_arm_linux) |
| 1097 | layout->o_sysno = OFFSET_arm_R7; |
| 1098 | layout->o_arg1 = OFFSET_arm_R0; |
| 1099 | layout->o_arg2 = OFFSET_arm_R1; |
| 1100 | layout->o_arg3 = OFFSET_arm_R2; |
| 1101 | layout->o_arg4 = OFFSET_arm_R3; |
| 1102 | layout->o_arg5 = OFFSET_arm_R4; |
| 1103 | layout->o_arg6 = OFFSET_arm_R5; |
| 1104 | layout->uu_arg7 = -1; /* impossible value */ |
| 1105 | layout->uu_arg8 = -1; /* impossible value */ |
| 1106 | |
sewardj | 5db1540 | 2012-06-07 09:13:21 +0000 | [diff] [blame] | 1107 | #elif defined(VGP_mips32_linux) |
| 1108 | layout->o_sysno = OFFSET_mips32_r2; |
| 1109 | layout->o_arg1 = OFFSET_mips32_r4; |
| 1110 | layout->o_arg2 = OFFSET_mips32_r5; |
| 1111 | layout->o_arg3 = OFFSET_mips32_r6; |
| 1112 | layout->o_arg4 = OFFSET_mips32_r7; |
| 1113 | layout->s_arg5 = sizeof(UWord) * 4; |
| 1114 | layout->s_arg6 = sizeof(UWord) * 5; |
| 1115 | layout->uu_arg7 = -1; /* impossible value */ |
| 1116 | layout->uu_arg8 = -1; /* impossible value */ |
| 1117 | |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 1118 | #elif defined(VGP_x86_darwin) |
| 1119 | layout->o_sysno = OFFSET_x86_EAX; |
| 1120 | // syscall parameters are on stack in C convention |
| 1121 | layout->s_arg1 = sizeof(UWord) * 1; |
| 1122 | layout->s_arg2 = sizeof(UWord) * 2; |
| 1123 | layout->s_arg3 = sizeof(UWord) * 3; |
| 1124 | layout->s_arg4 = sizeof(UWord) * 4; |
| 1125 | layout->s_arg5 = sizeof(UWord) * 5; |
| 1126 | layout->s_arg6 = sizeof(UWord) * 6; |
| 1127 | layout->s_arg7 = sizeof(UWord) * 7; |
| 1128 | layout->s_arg8 = sizeof(UWord) * 8; |
| 1129 | |
| 1130 | #elif defined(VGP_amd64_darwin) |
| 1131 | layout->o_sysno = OFFSET_amd64_RAX; |
| 1132 | layout->o_arg1 = OFFSET_amd64_RDI; |
| 1133 | layout->o_arg2 = OFFSET_amd64_RSI; |
| 1134 | layout->o_arg3 = OFFSET_amd64_RDX; |
| 1135 | layout->o_arg4 = OFFSET_amd64_RCX; |
| 1136 | layout->o_arg5 = OFFSET_amd64_R8; |
| 1137 | layout->o_arg6 = OFFSET_amd64_R9; |
| 1138 | layout->s_arg7 = sizeof(UWord) * 1; |
| 1139 | layout->s_arg8 = sizeof(UWord) * 2; |
| 1140 | |
sewardj | b5b8740 | 2011-03-07 16:05:35 +0000 | [diff] [blame] | 1141 | #elif defined(VGP_s390x_linux) |
| 1142 | layout->o_sysno = OFFSET_s390x_SYSNO; |
| 1143 | layout->o_arg1 = OFFSET_s390x_r2; |
| 1144 | layout->o_arg2 = OFFSET_s390x_r3; |
| 1145 | layout->o_arg3 = OFFSET_s390x_r4; |
| 1146 | layout->o_arg4 = OFFSET_s390x_r5; |
| 1147 | layout->o_arg5 = OFFSET_s390x_r6; |
| 1148 | layout->o_arg6 = OFFSET_s390x_r7; |
| 1149 | layout->uu_arg7 = -1; /* impossible value */ |
| 1150 | layout->uu_arg8 = -1; /* impossible value */ |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 1151 | #else |
| 1152 | # error "getSyscallLayout: unknown arch" |
| 1153 | #endif |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1154 | } |
| 1155 | |
| 1156 | |
| 1157 | /* --------------------------------------------------------------------- |
| 1158 | The main driver logic |
| 1159 | ------------------------------------------------------------------ */ |
| 1160 | |
| 1161 | /* Finding the handlers for a given syscall, or faking up one |
| 1162 | when no handler is found. */ |
| 1163 | |
| 1164 | static |
| 1165 | void bad_before ( ThreadId tid, |
| 1166 | SyscallArgLayout* layout, |
| 1167 | /*MOD*/SyscallArgs* args, |
| 1168 | /*OUT*/SyscallStatus* status, |
| 1169 | /*OUT*/UWord* flags ) |
| 1170 | { |
sewardj | 738856f | 2009-07-15 14:48:32 +0000 | [diff] [blame] | 1171 | VG_(dmsg)("WARNING: unhandled syscall: %s\n", |
njn | 1a1e95c | 2009-06-03 06:50:06 +0000 | [diff] [blame] | 1172 | VG_SYSNUM_STRING_EXTRA(args->sysno)); |
njn | 12b9424 | 2009-06-03 07:17:07 +0000 | [diff] [blame] | 1173 | if (VG_(clo_verbosity) > 1) { |
| 1174 | VG_(get_and_pp_StackTrace)(tid, VG_(clo_backtrace_size)); |
| 1175 | } |
sewardj | 738856f | 2009-07-15 14:48:32 +0000 | [diff] [blame] | 1176 | VG_(dmsg)("You may be able to write your own handler.\n"); |
| 1177 | VG_(dmsg)("Read the file README_MISSING_SYSCALL_OR_IOCTL.\n"); |
| 1178 | VG_(dmsg)("Nevertheless we consider this a bug. Please report\n"); |
| 1179 | VG_(dmsg)("it at http://valgrind.org/support/bug_reports.html.\n"); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1180 | |
| 1181 | SET_STATUS_Failure(VKI_ENOSYS); |
| 1182 | } |
| 1183 | |
| 1184 | static SyscallTableEntry bad_sys = |
| 1185 | { bad_before, NULL }; |
| 1186 | |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 1187 | static const SyscallTableEntry* get_syscall_entry ( Int syscallno ) |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1188 | { |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 1189 | const SyscallTableEntry* sys = NULL; |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1190 | |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 1191 | # if defined(VGO_linux) |
sewardj | 59570ff | 2010-01-01 11:59:33 +0000 | [diff] [blame] | 1192 | sys = ML_(get_linux_syscall_entry)( syscallno ); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1193 | |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 1194 | # elif defined(VGO_darwin) |
| 1195 | Int idx = VG_DARWIN_SYSNO_INDEX(syscallno); |
| 1196 | |
| 1197 | switch (VG_DARWIN_SYSNO_CLASS(syscallno)) { |
| 1198 | case VG_DARWIN_SYSCALL_CLASS_UNIX: |
| 1199 | if (idx >= 0 && idx < ML_(syscall_table_size) && |
| 1200 | ML_(syscall_table)[idx].before != NULL) |
| 1201 | sys = &ML_(syscall_table)[idx]; |
| 1202 | break; |
| 1203 | case VG_DARWIN_SYSCALL_CLASS_MACH: |
| 1204 | if (idx >= 0 && idx < ML_(mach_trap_table_size) && |
| 1205 | ML_(mach_trap_table)[idx].before != NULL) |
| 1206 | sys = &ML_(mach_trap_table)[idx]; |
| 1207 | break; |
| 1208 | case VG_DARWIN_SYSCALL_CLASS_MDEP: |
| 1209 | if (idx >= 0 && idx < ML_(mdep_trap_table_size) && |
| 1210 | ML_(mdep_trap_table)[idx].before != NULL) |
| 1211 | sys = &ML_(mdep_trap_table)[idx]; |
| 1212 | break; |
| 1213 | default: |
| 1214 | vg_assert(0); |
| 1215 | break; |
| 1216 | } |
| 1217 | |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 1218 | # else |
| 1219 | # error Unknown OS |
| 1220 | # endif |
| 1221 | |
| 1222 | return sys == NULL ? &bad_sys : sys; |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1223 | } |
| 1224 | |
| 1225 | |
| 1226 | /* Add and remove signals from mask so that we end up telling the |
| 1227 | kernel the state we actually want rather than what the client |
| 1228 | wants. */ |
njn | 1dcee09 | 2009-02-24 03:07:37 +0000 | [diff] [blame] | 1229 | static void sanitize_client_sigmask(vki_sigset_t *mask) |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1230 | { |
| 1231 | VG_(sigdelset)(mask, VKI_SIGKILL); |
| 1232 | VG_(sigdelset)(mask, VKI_SIGSTOP); |
njn | 351d006 | 2005-06-21 22:23:59 +0000 | [diff] [blame] | 1233 | VG_(sigdelset)(mask, VG_SIGVGKILL); /* never block */ |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1234 | } |
| 1235 | |
| 1236 | typedef |
| 1237 | struct { |
| 1238 | SyscallArgs orig_args; |
| 1239 | SyscallArgs args; |
| 1240 | SyscallStatus status; |
| 1241 | UWord flags; |
| 1242 | } |
| 1243 | SyscallInfo; |
| 1244 | |
| 1245 | SyscallInfo syscallInfo[VG_N_THREADS]; |
| 1246 | |
| 1247 | |
| 1248 | /* The scheduler needs to be able to zero out these records after a |
njn | c1b0181 | 2005-06-17 22:19:06 +0000 | [diff] [blame] | 1249 | fork, hence this is exported from m_syswrap. */ |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1250 | void VG_(clear_syscallInfo) ( Int tid ) |
| 1251 | { |
| 1252 | vg_assert(tid >= 0 && tid < VG_N_THREADS); |
| 1253 | VG_(memset)( & syscallInfo[tid], 0, sizeof( syscallInfo[tid] )); |
| 1254 | syscallInfo[tid].status.what = SsIdle; |
| 1255 | } |
| 1256 | |
| 1257 | static void ensure_initialised ( void ) |
| 1258 | { |
| 1259 | Int i; |
| 1260 | static Bool init_done = False; |
| 1261 | if (init_done) |
| 1262 | return; |
| 1263 | init_done = True; |
| 1264 | for (i = 0; i < VG_N_THREADS; i++) { |
| 1265 | VG_(clear_syscallInfo)( i ); |
| 1266 | } |
| 1267 | } |
| 1268 | |
| 1269 | /* --- This is the main function of this file. --- */ |
| 1270 | |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 1271 | void VG_(client_syscall) ( ThreadId tid, UInt trc ) |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1272 | { |
njn | 6dad504 | 2009-05-20 05:22:38 +0000 | [diff] [blame] | 1273 | Word sysno; |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1274 | ThreadState* tst; |
| 1275 | const SyscallTableEntry* ent; |
| 1276 | SyscallArgLayout layout; |
| 1277 | SyscallInfo* sci; |
| 1278 | |
| 1279 | ensure_initialised(); |
| 1280 | |
| 1281 | vg_assert(VG_(is_valid_tid)(tid)); |
| 1282 | vg_assert(tid >= 1 && tid < VG_N_THREADS); |
| 1283 | vg_assert(VG_(is_running_thread)(tid)); |
| 1284 | |
| 1285 | tst = VG_(get_ThreadState)(tid); |
| 1286 | |
sewardj | 2547532 | 2008-10-27 01:23:04 +0000 | [diff] [blame] | 1287 | /* BEGIN ensure root thread's stack is suitably mapped */ |
| 1288 | /* In some rare circumstances, we may do the syscall without the |
| 1289 | bottom page of the stack being mapped, because the stack pointer |
| 1290 | was moved down just a few instructions before the syscall |
| 1291 | instruction, and there have been no memory references since |
| 1292 | then, that would cause a call to VG_(extend_stack) to have |
| 1293 | happened. |
| 1294 | |
| 1295 | In native execution that's OK: the kernel automagically extends |
| 1296 | the stack's mapped area down to cover the stack pointer (or sp - |
| 1297 | redzone, really). In simulated normal execution that's OK too, |
| 1298 | since any signals we get from accessing below the mapped area of |
| 1299 | the (guest's) stack lead us to VG_(extend_stack), where we |
| 1300 | simulate the kernel's stack extension logic. But that leaves |
| 1301 | the problem of entering a syscall with the SP unmapped. Because |
| 1302 | the kernel doesn't know that the segment immediately above SP is |
| 1303 | supposed to be a grow-down segment, it causes the syscall to |
| 1304 | fail, and thereby causes a divergence between native behaviour |
| 1305 | (syscall succeeds) and simulated behaviour (syscall fails). |
| 1306 | |
| 1307 | This is quite a rare failure mode. It has only been seen |
| 1308 | affecting calls to sys_readlink on amd64-linux, and even then it |
| 1309 | requires a certain code sequence around the syscall to trigger |
| 1310 | it. Here is one: |
| 1311 | |
| 1312 | extern int my_readlink ( const char* path ); |
| 1313 | asm( |
| 1314 | ".text\n" |
| 1315 | ".globl my_readlink\n" |
| 1316 | "my_readlink:\n" |
| 1317 | "\tsubq $0x1008,%rsp\n" |
| 1318 | "\tmovq %rdi,%rdi\n" // path is in rdi |
| 1319 | "\tmovq %rsp,%rsi\n" // &buf[0] -> rsi |
| 1320 | "\tmovl $0x1000,%edx\n" // sizeof(buf) in rdx |
| 1321 | "\tmovl $"__NR_READLINK",%eax\n" // syscall number |
| 1322 | "\tsyscall\n" |
| 1323 | "\taddq $0x1008,%rsp\n" |
| 1324 | "\tret\n" |
| 1325 | ".previous\n" |
| 1326 | ); |
| 1327 | |
| 1328 | For more details, see bug #156404 |
| 1329 | (https://bugs.kde.org/show_bug.cgi?id=156404). |
| 1330 | |
| 1331 | The fix is actually very simple. We simply need to call |
| 1332 | VG_(extend_stack) for this thread, handing it the lowest |
| 1333 | possible valid address for stack (sp - redzone), to ensure the |
| 1334 | pages all the way down to that address, are mapped. Because |
| 1335 | this is a potentially expensive and frequent operation, we |
| 1336 | filter in two ways: |
| 1337 | |
| 1338 | First, only the main thread (tid=1) has a growdown stack. So |
| 1339 | ignore all others. It is conceivable, although highly unlikely, |
| 1340 | that the main thread exits, and later another thread is |
| 1341 | allocated tid=1, but that's harmless, I believe; |
| 1342 | VG_(extend_stack) will do nothing when applied to a non-root |
| 1343 | thread. |
| 1344 | |
| 1345 | Secondly, first call VG_(am_find_nsegment) directly, to see if |
| 1346 | the page holding (sp - redzone) is mapped correctly. If so, do |
| 1347 | nothing. This is almost always the case. VG_(extend_stack) |
| 1348 | calls VG_(am_find_nsegment) twice, so this optimisation -- and |
| 1349 | that's all it is -- more or less halves the number of calls to |
| 1350 | VG_(am_find_nsegment) required. |
| 1351 | |
| 1352 | TODO: the test "seg->kind == SkAnonC" is really inadequate, |
| 1353 | because although it tests whether the segment is mapped |
| 1354 | _somehow_, it doesn't check that it has the right permissions |
| 1355 | (r,w, maybe x) ? We could test that here, but it will also be |
| 1356 | necessary to fix the corresponding test in VG_(extend_stack). |
| 1357 | |
| 1358 | All this guff is of course Linux-specific. Hence the ifdef. |
| 1359 | */ |
| 1360 | # if defined(VGO_linux) |
| 1361 | if (tid == 1/*ROOT THREAD*/) { |
| 1362 | Addr stackMin = VG_(get_SP)(tid) - VG_STACK_REDZONE_SZB; |
| 1363 | NSegment const* seg = VG_(am_find_nsegment)(stackMin); |
| 1364 | if (seg && seg->kind == SkAnonC) { |
| 1365 | /* stackMin is already mapped. Nothing to do. */ |
| 1366 | } else { |
| 1367 | (void)VG_(extend_stack)( stackMin, |
| 1368 | tst->client_stack_szB ); |
| 1369 | } |
| 1370 | } |
| 1371 | # endif |
| 1372 | /* END ensure root thread's stack is suitably mapped */ |
| 1373 | |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1374 | /* First off, get the syscall args and number. This is a |
| 1375 | platform-dependent action. */ |
| 1376 | |
| 1377 | sci = & syscallInfo[tid]; |
| 1378 | vg_assert(sci->status.what == SsIdle); |
| 1379 | |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 1380 | getSyscallArgsFromGuestState( &sci->orig_args, &tst->arch.vex, trc ); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1381 | |
| 1382 | /* Copy .orig_args to .args. The pre-handler may modify .args, but |
| 1383 | we want to keep the originals too, just in case. */ |
| 1384 | sci->args = sci->orig_args; |
| 1385 | |
| 1386 | /* Save the syscall number in the thread state in case the syscall |
| 1387 | is interrupted by a signal. */ |
| 1388 | sysno = sci->orig_args.sysno; |
| 1389 | |
sewardj | fe7fd4b | 2011-06-15 15:11:50 +0000 | [diff] [blame] | 1390 | /* It's sometimes useful, as a crude debugging hack, to get a |
| 1391 | stack trace at each (or selected) syscalls. */ |
sewardj | 27a4db0 | 2011-09-26 20:16:15 +0000 | [diff] [blame] | 1392 | if (0 && sysno == __NR_ioctl) { |
| 1393 | VG_(umsg)("\nioctl:\n"); |
sewardj | fe7fd4b | 2011-06-15 15:11:50 +0000 | [diff] [blame] | 1394 | VG_(get_and_pp_StackTrace)(tid, 10); |
sewardj | 27a4db0 | 2011-09-26 20:16:15 +0000 | [diff] [blame] | 1395 | VG_(umsg)("\n"); |
sewardj | fe7fd4b | 2011-06-15 15:11:50 +0000 | [diff] [blame] | 1396 | } |
| 1397 | |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 1398 | # if defined(VGO_darwin) |
| 1399 | /* Record syscall class. But why? Because the syscall might be |
| 1400 | interrupted by a signal, and in the signal handler (which will |
| 1401 | be m_signals.async_signalhandler) we will need to build a SysRes |
| 1402 | reflecting the syscall return result. In order to do that we |
| 1403 | need to know the syscall class. Hence stash it in the guest |
sewardj | 6e9de46 | 2011-06-28 07:25:29 +0000 | [diff] [blame] | 1404 | state of this thread. This madness is not needed on Linux |
| 1405 | because it only has a single syscall return convention and so |
| 1406 | there is no ambiguity involved in converting the post-signal |
| 1407 | machine state into a SysRes. */ |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 1408 | tst->arch.vex.guest_SC_CLASS = VG_DARWIN_SYSNO_CLASS(sysno); |
| 1409 | # endif |
| 1410 | |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1411 | /* The default what-to-do-next thing is hand the syscall to the |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 1412 | kernel, so we pre-set that here. Set .sres to something |
| 1413 | harmless looking (is irrelevant because .what is not |
| 1414 | SsComplete.) */ |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1415 | sci->status.what = SsHandToKernel; |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 1416 | sci->status.sres = VG_(mk_SysRes_Error)(0); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1417 | sci->flags = 0; |
| 1418 | |
| 1419 | /* Fetch the syscall's handlers. If no handlers exist for this |
| 1420 | syscall, we are given dummy handlers which force an immediate |
| 1421 | return with ENOSYS. */ |
| 1422 | ent = get_syscall_entry(sysno); |
| 1423 | |
| 1424 | /* Fetch the layout information, which tells us where in the guest |
| 1425 | state the syscall args reside. This is a platform-dependent |
| 1426 | action. This info is needed so that the scalar syscall argument |
| 1427 | checks (PRE_REG_READ calls) know which bits of the guest state |
| 1428 | they need to inspect. */ |
| 1429 | getSyscallArgLayout( &layout ); |
| 1430 | |
| 1431 | /* Make sure the tmp signal mask matches the real signal mask; |
| 1432 | sigsuspend may change this. */ |
| 1433 | vg_assert(VG_(iseqsigset)(&tst->sig_mask, &tst->tmp_sig_mask)); |
| 1434 | |
| 1435 | /* Right, we're finally ready to Party. Call the pre-handler and |
| 1436 | see what we get back. At this point: |
| 1437 | |
| 1438 | sci->status.what is Unset (we don't know yet). |
| 1439 | sci->orig_args contains the original args. |
| 1440 | sci->args is the same as sci->orig_args. |
| 1441 | sci->flags is zero. |
| 1442 | */ |
| 1443 | |
njn | 1a1e95c | 2009-06-03 06:50:06 +0000 | [diff] [blame] | 1444 | PRINT("SYSCALL[%d,%d](%s) ", |
| 1445 | VG_(getpid)(), tid, VG_SYSNUM_STRING(sysno)); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1446 | |
| 1447 | /* Do any pre-syscall actions */ |
| 1448 | if (VG_(needs).syscall_wrapper) { |
sewardj | 1c0ce7a | 2009-07-01 08:10:49 +0000 | [diff] [blame] | 1449 | UWord tmpv[8]; |
| 1450 | tmpv[0] = sci->orig_args.arg1; |
| 1451 | tmpv[1] = sci->orig_args.arg2; |
| 1452 | tmpv[2] = sci->orig_args.arg3; |
| 1453 | tmpv[3] = sci->orig_args.arg4; |
| 1454 | tmpv[4] = sci->orig_args.arg5; |
| 1455 | tmpv[5] = sci->orig_args.arg6; |
| 1456 | tmpv[6] = sci->orig_args.arg7; |
| 1457 | tmpv[7] = sci->orig_args.arg8; |
| 1458 | VG_TDICT_CALL(tool_pre_syscall, tid, sysno, |
| 1459 | &tmpv[0], sizeof(tmpv)/sizeof(tmpv[0])); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1460 | } |
| 1461 | |
| 1462 | vg_assert(ent); |
| 1463 | vg_assert(ent->before); |
| 1464 | (ent->before)( tid, |
| 1465 | &layout, |
| 1466 | &sci->args, &sci->status, &sci->flags ); |
| 1467 | |
| 1468 | /* The pre-handler may have modified: |
| 1469 | sci->args |
| 1470 | sci->status |
| 1471 | sci->flags |
| 1472 | All else remains unchanged. |
| 1473 | Although the args may be modified, pre handlers are not allowed |
| 1474 | to change the syscall number. |
| 1475 | */ |
| 1476 | /* Now we proceed according to what the pre-handler decided. */ |
| 1477 | vg_assert(sci->status.what == SsHandToKernel |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 1478 | || sci->status.what == SsComplete); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1479 | vg_assert(sci->args.sysno == sci->orig_args.sysno); |
| 1480 | |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 1481 | if (sci->status.what == SsComplete && !sr_isError(sci->status.sres)) { |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1482 | /* The pre-handler completed the syscall itself, declaring |
| 1483 | success. */ |
sewardj | 1829053 | 2007-03-19 13:38:11 +0000 | [diff] [blame] | 1484 | if (sci->flags & SfNoWriteResult) { |
njn | 3373755 | 2009-05-20 05:19:22 +0000 | [diff] [blame] | 1485 | PRINT(" --> [pre-success] NoWriteResult"); |
sewardj | 1829053 | 2007-03-19 13:38:11 +0000 | [diff] [blame] | 1486 | } else { |
njn | 3373755 | 2009-05-20 05:19:22 +0000 | [diff] [blame] | 1487 | PRINT(" --> [pre-success] Success(0x%llx:0x%llx)", |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 1488 | (ULong)sr_ResHI(sci->status.sres), |
| 1489 | (ULong)sr_Res(sci->status.sres)); |
sewardj | 1829053 | 2007-03-19 13:38:11 +0000 | [diff] [blame] | 1490 | } |
sewardj | 45f4e7c | 2005-09-27 19:20:21 +0000 | [diff] [blame] | 1491 | /* In this case the allowable flags are to ask for a signal-poll |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1492 | and/or a yield after the call. Changing the args isn't |
| 1493 | allowed. */ |
sewardj | 1829053 | 2007-03-19 13:38:11 +0000 | [diff] [blame] | 1494 | vg_assert(0 == (sci->flags |
| 1495 | & ~(SfPollAfter | SfYieldAfter | SfNoWriteResult))); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1496 | vg_assert(eq_SyscallArgs(&sci->args, &sci->orig_args)); |
| 1497 | } |
| 1498 | |
| 1499 | else |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 1500 | if (sci->status.what == SsComplete && sr_isError(sci->status.sres)) { |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1501 | /* The pre-handler decided to fail syscall itself. */ |
njn | 3373755 | 2009-05-20 05:19:22 +0000 | [diff] [blame] | 1502 | PRINT(" --> [pre-fail] Failure(0x%llx)", (ULong)sr_Err(sci->status.sres)); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1503 | /* In this case, the pre-handler is also allowed to ask for the |
| 1504 | post-handler to be run anyway. Changing the args is not |
| 1505 | allowed. */ |
| 1506 | vg_assert(0 == (sci->flags & ~(SfMayBlock | SfPostOnFail | SfPollAfter))); |
| 1507 | vg_assert(eq_SyscallArgs(&sci->args, &sci->orig_args)); |
| 1508 | } |
| 1509 | |
| 1510 | else |
| 1511 | if (sci->status.what != SsHandToKernel) { |
| 1512 | /* huh?! */ |
| 1513 | vg_assert(0); |
| 1514 | } |
| 1515 | |
| 1516 | else /* (sci->status.what == HandToKernel) */ { |
| 1517 | /* Ok, this is the usual case -- and the complicated one. There |
| 1518 | are two subcases: sync and async. async is the general case |
| 1519 | and is to be used when there is any possibility that the |
| 1520 | syscall might block [a fact that the pre-handler must tell us |
| 1521 | via the sci->flags field.] Because the tidying-away / |
| 1522 | context-switch overhead of the async case could be large, if |
| 1523 | we are sure that the syscall will not block, we fast-track it |
| 1524 | by doing it directly in this thread, which is a lot |
| 1525 | simpler. */ |
| 1526 | |
sewardj | d6e91bc | 2005-11-17 14:26:52 +0000 | [diff] [blame] | 1527 | /* Check that the given flags are allowable: MayBlock, PollAfter |
| 1528 | and PostOnFail are ok. */ |
| 1529 | vg_assert(0 == (sci->flags & ~(SfMayBlock | SfPostOnFail | SfPollAfter))); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1530 | |
| 1531 | if (sci->flags & SfMayBlock) { |
| 1532 | |
| 1533 | /* Syscall may block, so run it asynchronously */ |
| 1534 | vki_sigset_t mask; |
| 1535 | |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1536 | PRINT(" --> [async] ... \n"); |
| 1537 | |
| 1538 | mask = tst->sig_mask; |
njn | 1dcee09 | 2009-02-24 03:07:37 +0000 | [diff] [blame] | 1539 | sanitize_client_sigmask(&mask); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1540 | |
| 1541 | /* Gack. More impedance matching. Copy the possibly |
| 1542 | modified syscall args back into the guest state. */ |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 1543 | /* JRS 2009-Mar-16: if the syscall args are possibly modified, |
| 1544 | then this assertion is senseless: |
| 1545 | vg_assert(eq_SyscallArgs(&sci->args, &sci->orig_args)); |
| 1546 | The case that exposed it was sys_posix_spawn on Darwin, |
| 1547 | which heavily modifies its arguments but then lets the call |
| 1548 | go through anyway, with SfToBlock set, hence we end up here. */ |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1549 | putSyscallArgsIntoGuestState( &sci->args, &tst->arch.vex ); |
| 1550 | |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 1551 | /* Drop the bigLock */ |
sewardj | ad0a3a8 | 2006-12-17 18:58:55 +0000 | [diff] [blame] | 1552 | VG_(release_BigLock)(tid, VgTs_WaitSys, "VG_(client_syscall)[async]"); |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 1553 | /* Urr. We're now in a race against other threads trying to |
| 1554 | acquire the bigLock. I guess that doesn't matter provided |
| 1555 | that do_syscall_for_client only touches thread-local |
| 1556 | state. */ |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1557 | |
| 1558 | /* Do the call, which operates directly on the guest state, |
| 1559 | not on our abstracted copies of the args/result. */ |
| 1560 | do_syscall_for_client(sysno, tst, &mask); |
| 1561 | |
| 1562 | /* do_syscall_for_client may not return if the syscall was |
| 1563 | interrupted by a signal. In that case, flow of control is |
| 1564 | first to m_signals.async_sighandler, which calls |
| 1565 | VG_(fixup_guest_state_after_syscall_interrupted), which |
| 1566 | fixes up the guest state, and possibly calls |
| 1567 | VG_(post_syscall). Once that's done, control drops back |
| 1568 | to the scheduler. */ |
| 1569 | |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 1570 | /* Darwin: do_syscall_for_client may not return if the |
| 1571 | syscall was workq_ops(WQOPS_THREAD_RETURN) and the kernel |
| 1572 | responded by starting the thread at wqthread_hijack(reuse=1) |
| 1573 | (to run another workqueue item). In that case, wqthread_hijack |
| 1574 | calls ML_(wqthread_continue), which is similar to |
| 1575 | VG_(fixup_guest_state_after_syscall_interrupted). */ |
| 1576 | |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1577 | /* Reacquire the lock */ |
sewardj | ad0a3a8 | 2006-12-17 18:58:55 +0000 | [diff] [blame] | 1578 | VG_(acquire_BigLock)(tid, "VG_(client_syscall)[async]"); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1579 | |
| 1580 | /* Even more impedance matching. Extract the syscall status |
| 1581 | from the guest state. */ |
| 1582 | getSyscallStatusFromGuestState( &sci->status, &tst->arch.vex ); |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 1583 | vg_assert(sci->status.what == SsComplete); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1584 | |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 1585 | /* Be decorative, if required. */ |
| 1586 | if (VG_(clo_trace_syscalls)) { |
| 1587 | Bool failed = sr_isError(sci->status.sres); |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 1588 | if (failed) { |
njn | 1a1e95c | 2009-06-03 06:50:06 +0000 | [diff] [blame] | 1589 | PRINT("SYSCALL[%d,%d](%s) ... [async] --> Failure(0x%llx)", |
| 1590 | VG_(getpid)(), tid, VG_SYSNUM_STRING(sysno), |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 1591 | (ULong)sr_Err(sci->status.sres)); |
| 1592 | } else { |
njn | 1a1e95c | 2009-06-03 06:50:06 +0000 | [diff] [blame] | 1593 | PRINT("SYSCALL[%d,%d](%s) ... [async] --> " |
njn | 3373755 | 2009-05-20 05:19:22 +0000 | [diff] [blame] | 1594 | "Success(0x%llx:0x%llx)", |
njn | 1a1e95c | 2009-06-03 06:50:06 +0000 | [diff] [blame] | 1595 | VG_(getpid)(), tid, VG_SYSNUM_STRING(sysno), |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 1596 | (ULong)sr_ResHI(sci->status.sres), |
| 1597 | (ULong)sr_Res(sci->status.sres) ); |
| 1598 | } |
| 1599 | } |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1600 | |
| 1601 | } else { |
| 1602 | |
| 1603 | /* run the syscall directly */ |
| 1604 | /* The pre-handler may have modified the syscall args, but |
| 1605 | since we're passing values in ->args directly to the |
| 1606 | kernel, there's no point in flushing them back to the |
| 1607 | guest state. Indeed doing so could be construed as |
| 1608 | incorrect. */ |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1609 | SysRes sres |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 1610 | = VG_(do_syscall)(sysno, sci->args.arg1, sci->args.arg2, |
| 1611 | sci->args.arg3, sci->args.arg4, |
| 1612 | sci->args.arg5, sci->args.arg6, |
| 1613 | sci->args.arg7, sci->args.arg8 ); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1614 | sci->status = convert_SysRes_to_SyscallStatus(sres); |
| 1615 | |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 1616 | /* Be decorative, if required. */ |
| 1617 | if (VG_(clo_trace_syscalls)) { |
| 1618 | Bool failed = sr_isError(sci->status.sres); |
| 1619 | if (failed) { |
njn | 3373755 | 2009-05-20 05:19:22 +0000 | [diff] [blame] | 1620 | PRINT("[sync] --> Failure(0x%llx)", |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 1621 | (ULong)sr_Err(sci->status.sres) ); |
| 1622 | } else { |
njn | 3373755 | 2009-05-20 05:19:22 +0000 | [diff] [blame] | 1623 | PRINT("[sync] --> Success(0x%llx:0x%llx)", |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 1624 | (ULong)sr_ResHI(sci->status.sres), |
| 1625 | (ULong)sr_Res(sci->status.sres) ); |
| 1626 | } |
| 1627 | } |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1628 | } |
| 1629 | } |
| 1630 | |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 1631 | vg_assert(sci->status.what == SsComplete); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1632 | |
| 1633 | vg_assert(VG_(is_running_thread)(tid)); |
| 1634 | |
| 1635 | /* Dump the syscall result back in the guest state. This is |
| 1636 | a platform-specific action. */ |
sewardj | 1829053 | 2007-03-19 13:38:11 +0000 | [diff] [blame] | 1637 | if (!(sci->flags & SfNoWriteResult)) |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 1638 | putSyscallStatusIntoGuestState( tid, &sci->status, &tst->arch.vex ); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1639 | |
| 1640 | /* Situation now: |
| 1641 | - the guest state is now correctly modified following the syscall |
| 1642 | - modified args, original args and syscall status are still |
| 1643 | available in the syscallInfo[] entry for this syscall. |
| 1644 | |
| 1645 | Now go on to do the post-syscall actions (read on down ..) |
| 1646 | */ |
njn | 3373755 | 2009-05-20 05:19:22 +0000 | [diff] [blame] | 1647 | PRINT(" "); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1648 | VG_(post_syscall)(tid); |
njn | 3373755 | 2009-05-20 05:19:22 +0000 | [diff] [blame] | 1649 | PRINT("\n"); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1650 | } |
| 1651 | |
| 1652 | |
| 1653 | /* Perform post syscall actions. The expected state on entry is |
| 1654 | precisely as at the end of VG_(client_syscall), that is: |
| 1655 | |
| 1656 | - guest state up to date following the syscall |
| 1657 | - modified args, original args and syscall status are still |
| 1658 | available in the syscallInfo[] entry for this syscall. |
| 1659 | - syscall status matches what's in the guest state. |
| 1660 | |
| 1661 | There are two ways to get here: the normal way -- being called by |
| 1662 | VG_(client_syscall), and the unusual way, from |
| 1663 | VG_(fixup_guest_state_after_syscall_interrupted). |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 1664 | Darwin: there's a third way, ML_(wqthread_continue). |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1665 | */ |
| 1666 | void VG_(post_syscall) (ThreadId tid) |
| 1667 | { |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1668 | SyscallInfo* sci; |
| 1669 | const SyscallTableEntry* ent; |
| 1670 | SyscallStatus test_status; |
| 1671 | ThreadState* tst; |
njn | 6dad504 | 2009-05-20 05:22:38 +0000 | [diff] [blame] | 1672 | Word sysno; |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1673 | |
| 1674 | /* Preliminaries */ |
| 1675 | vg_assert(VG_(is_valid_tid)(tid)); |
| 1676 | vg_assert(tid >= 1 && tid < VG_N_THREADS); |
| 1677 | vg_assert(VG_(is_running_thread)(tid)); |
| 1678 | |
| 1679 | tst = VG_(get_ThreadState)(tid); |
| 1680 | sci = & syscallInfo[tid]; |
| 1681 | |
| 1682 | /* m_signals.sigvgkill_handler might call here even when not in |
| 1683 | a syscall. */ |
| 1684 | if (sci->status.what == SsIdle || sci->status.what == SsHandToKernel) { |
| 1685 | sci->status.what = SsIdle; |
| 1686 | return; |
| 1687 | } |
| 1688 | |
| 1689 | /* Validate current syscallInfo entry. In particular we require |
| 1690 | that the current .status matches what's actually in the guest |
sewardj | 1829053 | 2007-03-19 13:38:11 +0000 | [diff] [blame] | 1691 | state. At least in the normal case where we have actually |
| 1692 | previously written the result into the guest state. */ |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 1693 | vg_assert(sci->status.what == SsComplete); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1694 | |
| 1695 | getSyscallStatusFromGuestState( &test_status, &tst->arch.vex ); |
sewardj | 1829053 | 2007-03-19 13:38:11 +0000 | [diff] [blame] | 1696 | if (!(sci->flags & SfNoWriteResult)) |
| 1697 | vg_assert(eq_SyscallStatus( &sci->status, &test_status )); |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 1698 | /* Failure of the above assertion on Darwin can indicate a problem |
| 1699 | in the syscall wrappers that pre-fail or pre-succeed the |
| 1700 | syscall, by calling SET_STATUS_Success or SET_STATUS_Failure, |
| 1701 | when they really should call SET_STATUS_from_SysRes. The former |
| 1702 | create a UNIX-class syscall result on Darwin, which may not be |
| 1703 | correct for the syscall; if that's the case then this assertion |
njn | 4e8808b | 2009-06-05 01:33:16 +0000 | [diff] [blame] | 1704 | fires. See PRE(thread_fast_set_cthread_self) for an example. On |
| 1705 | non-Darwin platforms this assertion is should never fail, and this |
| 1706 | comment is completely irrelevant. */ |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1707 | /* Ok, looks sane */ |
| 1708 | |
| 1709 | /* Get the system call number. Because the pre-handler isn't |
| 1710 | allowed to mess with it, it should be the same for both the |
| 1711 | original and potentially-modified args. */ |
| 1712 | vg_assert(sci->args.sysno == sci->orig_args.sysno); |
| 1713 | sysno = sci->args.sysno; |
| 1714 | ent = get_syscall_entry(sysno); |
| 1715 | |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 1716 | /* pre: status == Complete (asserted above) */ |
| 1717 | /* Consider either success or failure. Now run the post handler if: |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1718 | - it exists, and |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 1719 | - Success or (Failure and PostOnFail is set) |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1720 | */ |
| 1721 | if (ent->after |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 1722 | && ((!sr_isError(sci->status.sres)) |
| 1723 | || (sr_isError(sci->status.sres) |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1724 | && (sci->flags & SfPostOnFail) ))) { |
| 1725 | |
| 1726 | (ent->after)( tid, &sci->args, &sci->status ); |
| 1727 | } |
| 1728 | |
| 1729 | /* Because the post handler might have changed the status (eg, the |
| 1730 | post-handler for sys_open can change the result from success to |
| 1731 | failure if the kernel supplied a fd that it doesn't like), once |
| 1732 | again dump the syscall result back in the guest state.*/ |
sewardj | 1829053 | 2007-03-19 13:38:11 +0000 | [diff] [blame] | 1733 | if (!(sci->flags & SfNoWriteResult)) |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 1734 | putSyscallStatusIntoGuestState( tid, &sci->status, &tst->arch.vex ); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1735 | |
| 1736 | /* Do any post-syscall actions required by the tool. */ |
sewardj | 1c0ce7a | 2009-07-01 08:10:49 +0000 | [diff] [blame] | 1737 | if (VG_(needs).syscall_wrapper) { |
| 1738 | UWord tmpv[8]; |
| 1739 | tmpv[0] = sci->orig_args.arg1; |
| 1740 | tmpv[1] = sci->orig_args.arg2; |
| 1741 | tmpv[2] = sci->orig_args.arg3; |
| 1742 | tmpv[3] = sci->orig_args.arg4; |
| 1743 | tmpv[4] = sci->orig_args.arg5; |
| 1744 | tmpv[5] = sci->orig_args.arg6; |
| 1745 | tmpv[6] = sci->orig_args.arg7; |
| 1746 | tmpv[7] = sci->orig_args.arg8; |
| 1747 | VG_TDICT_CALL(tool_post_syscall, tid, |
| 1748 | sysno, |
| 1749 | &tmpv[0], sizeof(tmpv)/sizeof(tmpv[0]), |
| 1750 | sci->status.sres); |
| 1751 | } |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1752 | |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1753 | /* The syscall is done. */ |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 1754 | vg_assert(sci->status.what == SsComplete); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1755 | sci->status.what = SsIdle; |
| 1756 | |
| 1757 | /* The pre/post wrappers may have concluded that pending signals |
| 1758 | might have been created, and will have set SfPollAfter to |
| 1759 | request a poll for them once the syscall is done. */ |
| 1760 | if (sci->flags & SfPollAfter) |
| 1761 | VG_(poll_signals)(tid); |
| 1762 | |
| 1763 | /* Similarly, the wrappers might have asked for a yield |
| 1764 | afterwards. */ |
| 1765 | if (sci->flags & SfYieldAfter) |
| 1766 | VG_(vg_yield)(); |
| 1767 | } |
| 1768 | |
| 1769 | |
| 1770 | /* --------------------------------------------------------------------- |
| 1771 | Dealing with syscalls which get interrupted by a signal: |
| 1772 | VG_(fixup_guest_state_after_syscall_interrupted) |
| 1773 | ------------------------------------------------------------------ */ |
| 1774 | |
| 1775 | /* Syscalls done on behalf of the client are finally handed off to the |
| 1776 | kernel in VG_(client_syscall) above, either by calling |
| 1777 | do_syscall_for_client (the async case), or by calling |
| 1778 | VG_(do_syscall6) (the sync case). |
| 1779 | |
| 1780 | If the syscall is not interrupted by a signal (it may block and |
| 1781 | later unblock, but that's irrelevant here) then those functions |
| 1782 | eventually return and so control is passed to VG_(post_syscall). |
| 1783 | NB: not sure if the sync case can actually get interrupted, as it |
| 1784 | operates with all signals masked. |
| 1785 | |
| 1786 | However, the syscall may get interrupted by an async-signal. In |
| 1787 | that case do_syscall_for_client/VG_(do_syscall6) do not |
| 1788 | return. Instead we wind up in m_signals.async_sighandler. We need |
| 1789 | to fix up the guest state to make it look like the syscall was |
| 1790 | interrupted for guest. So async_sighandler calls here, and this |
| 1791 | does the fixup. Note that from here we wind up calling |
| 1792 | VG_(post_syscall) too. |
| 1793 | */ |
| 1794 | |
| 1795 | |
sewardj | 1b9cd1c | 2005-06-28 19:04:51 +0000 | [diff] [blame] | 1796 | /* These are addresses within ML_(do_syscall_for_client_WRK). See |
| 1797 | syscall-$PLAT.S for details. |
| 1798 | */ |
sewardj | 6e9de46 | 2011-06-28 07:25:29 +0000 | [diff] [blame] | 1799 | #if defined(VGO_linux) |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 1800 | extern const Addr ML_(blksys_setup); |
| 1801 | extern const Addr ML_(blksys_restart); |
| 1802 | extern const Addr ML_(blksys_complete); |
| 1803 | extern const Addr ML_(blksys_committed); |
| 1804 | extern const Addr ML_(blksys_finished); |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 1805 | #elif defined(VGO_darwin) |
| 1806 | /* Darwin requires extra uglyness */ |
| 1807 | extern const Addr ML_(blksys_setup_MACH); |
| 1808 | extern const Addr ML_(blksys_restart_MACH); |
| 1809 | extern const Addr ML_(blksys_complete_MACH); |
| 1810 | extern const Addr ML_(blksys_committed_MACH); |
| 1811 | extern const Addr ML_(blksys_finished_MACH); |
| 1812 | extern const Addr ML_(blksys_setup_MDEP); |
| 1813 | extern const Addr ML_(blksys_restart_MDEP); |
| 1814 | extern const Addr ML_(blksys_complete_MDEP); |
| 1815 | extern const Addr ML_(blksys_committed_MDEP); |
| 1816 | extern const Addr ML_(blksys_finished_MDEP); |
| 1817 | extern const Addr ML_(blksys_setup_UNIX); |
| 1818 | extern const Addr ML_(blksys_restart_UNIX); |
| 1819 | extern const Addr ML_(blksys_complete_UNIX); |
| 1820 | extern const Addr ML_(blksys_committed_UNIX); |
| 1821 | extern const Addr ML_(blksys_finished_UNIX); |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 1822 | #else |
| 1823 | # error "Unknown OS" |
| 1824 | #endif |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1825 | |
| 1826 | |
| 1827 | /* Back up guest state to restart a system call. */ |
| 1828 | |
sewardj | 7eb7c58 | 2005-06-23 01:02:53 +0000 | [diff] [blame] | 1829 | void ML_(fixup_guest_state_to_restart_syscall) ( ThreadArchState* arch ) |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1830 | { |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 1831 | #if defined(VGP_x86_linux) |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1832 | arch->vex.guest_EIP -= 2; // sizeof(int $0x80) |
| 1833 | |
| 1834 | /* Make sure our caller is actually sane, and we're really backing |
| 1835 | back over a syscall. |
| 1836 | |
| 1837 | int $0x80 == CD 80 |
| 1838 | */ |
| 1839 | { |
| 1840 | UChar *p = (UChar *)arch->vex.guest_EIP; |
| 1841 | |
| 1842 | if (p[0] != 0xcd || p[1] != 0x80) |
| 1843 | VG_(message)(Vg_DebugMsg, |
bart | a0b6b2c | 2008-07-07 06:49:24 +0000 | [diff] [blame] | 1844 | "?! restarting over syscall at %#x %02x %02x\n", |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1845 | arch->vex.guest_EIP, p[0], p[1]); |
| 1846 | |
| 1847 | vg_assert(p[0] == 0xcd && p[1] == 0x80); |
| 1848 | } |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 1849 | |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 1850 | #elif defined(VGP_amd64_linux) |
sewardj | e7aa4ae | 2005-06-09 12:43:42 +0000 | [diff] [blame] | 1851 | arch->vex.guest_RIP -= 2; // sizeof(syscall) |
| 1852 | |
| 1853 | /* Make sure our caller is actually sane, and we're really backing |
| 1854 | back over a syscall. |
| 1855 | |
| 1856 | syscall == 0F 05 |
| 1857 | */ |
| 1858 | { |
| 1859 | UChar *p = (UChar *)arch->vex.guest_RIP; |
| 1860 | |
| 1861 | if (p[0] != 0x0F || p[1] != 0x05) |
| 1862 | VG_(message)(Vg_DebugMsg, |
bart | a0b6b2c | 2008-07-07 06:49:24 +0000 | [diff] [blame] | 1863 | "?! restarting over syscall at %#llx %02x %02x\n", |
sewardj | e7aa4ae | 2005-06-09 12:43:42 +0000 | [diff] [blame] | 1864 | arch->vex.guest_RIP, p[0], p[1]); |
| 1865 | |
| 1866 | vg_assert(p[0] == 0x0F && p[1] == 0x05); |
| 1867 | } |
sewardj | e7aa4ae | 2005-06-09 12:43:42 +0000 | [diff] [blame] | 1868 | |
sewardj | 2c48c7b | 2005-11-29 13:05:56 +0000 | [diff] [blame] | 1869 | #elif defined(VGP_ppc32_linux) || defined(VGP_ppc64_linux) |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 1870 | arch->vex.guest_CIA -= 4; // sizeof(ppc32 instr) |
| 1871 | |
| 1872 | /* Make sure our caller is actually sane, and we're really backing |
| 1873 | back over a syscall. |
| 1874 | |
| 1875 | sc == 44 00 00 02 |
| 1876 | */ |
| 1877 | { |
| 1878 | UChar *p = (UChar *)arch->vex.guest_CIA; |
| 1879 | |
| 1880 | if (p[0] != 0x44 || p[1] != 0x0 || p[2] != 0x0 || p[3] != 0x02) |
| 1881 | VG_(message)(Vg_DebugMsg, |
bart | a0b6b2c | 2008-07-07 06:49:24 +0000 | [diff] [blame] | 1882 | "?! restarting over syscall at %#llx %02x %02x %02x %02x\n", |
| 1883 | arch->vex.guest_CIA + 0ULL, p[0], p[1], p[2], p[3]); |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 1884 | |
| 1885 | vg_assert(p[0] == 0x44 && p[1] == 0x0 && p[2] == 0x0 && p[3] == 0x2); |
| 1886 | } |
| 1887 | |
sewardj | 59570ff | 2010-01-01 11:59:33 +0000 | [diff] [blame] | 1888 | #elif defined(VGP_arm_linux) |
sewardj | 4dddd06 | 2010-08-22 22:18:31 +0000 | [diff] [blame] | 1889 | if (arch->vex.guest_R15T & 1) { |
| 1890 | // Thumb mode. SVC is a encoded as |
| 1891 | // 1101 1111 imm8 |
| 1892 | // where imm8 is the SVC number, and we only accept 0. |
| 1893 | arch->vex.guest_R15T -= 2; // sizeof(thumb 16 bit insn) |
| 1894 | UChar* p = (UChar*)(arch->vex.guest_R15T - 1); |
| 1895 | Bool valid = p[0] == 0 && p[1] == 0xDF; |
| 1896 | if (!valid) { |
sewardj | 59570ff | 2010-01-01 11:59:33 +0000 | [diff] [blame] | 1897 | VG_(message)(Vg_DebugMsg, |
sewardj | 4dddd06 | 2010-08-22 22:18:31 +0000 | [diff] [blame] | 1898 | "?! restarting over (Thumb) syscall that is not syscall " |
| 1899 | "at %#llx %02x %02x\n", |
| 1900 | arch->vex.guest_R15T - 1ULL, p[0], p[1]); |
| 1901 | } |
| 1902 | vg_assert(valid); |
| 1903 | // FIXME: NOTE, this really isn't right. We need to back up |
| 1904 | // ITSTATE to what it was before the SVC instruction, but we |
| 1905 | // don't know what it was. At least assert that it is now |
| 1906 | // zero, because if it is nonzero then it must also have |
| 1907 | // been nonzero for the SVC itself, which means it was |
| 1908 | // conditional. Urk. |
| 1909 | vg_assert(arch->vex.guest_ITSTATE == 0); |
| 1910 | } else { |
| 1911 | // ARM mode. SVC is encoded as |
| 1912 | // cond 1111 imm24 |
| 1913 | // where imm24 is the SVC number, and we only accept 0. |
| 1914 | arch->vex.guest_R15T -= 4; // sizeof(arm instr) |
| 1915 | UChar* p = (UChar*)arch->vex.guest_R15T; |
| 1916 | Bool valid = p[0] == 0 && p[1] == 0 && p[2] == 0 |
| 1917 | && (p[3] & 0xF) == 0xF; |
| 1918 | if (!valid) { |
| 1919 | VG_(message)(Vg_DebugMsg, |
| 1920 | "?! restarting over (ARM) syscall that is not syscall " |
| 1921 | "at %#llx %02x %02x %02x %02x\n", |
sewardj | 9dcfdff | 2010-08-22 12:00:40 +0000 | [diff] [blame] | 1922 | arch->vex.guest_R15T + 0ULL, p[0], p[1], p[2], p[3]); |
sewardj | 4dddd06 | 2010-08-22 22:18:31 +0000 | [diff] [blame] | 1923 | } |
| 1924 | vg_assert(valid); |
sewardj | 59570ff | 2010-01-01 11:59:33 +0000 | [diff] [blame] | 1925 | } |
| 1926 | |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 1927 | #elif defined(VGP_x86_darwin) |
| 1928 | arch->vex.guest_EIP = arch->vex.guest_IP_AT_SYSCALL; |
| 1929 | |
| 1930 | /* Make sure our caller is actually sane, and we're really backing |
| 1931 | back over a syscall. |
| 1932 | |
| 1933 | int $0x80 == CD 80 |
| 1934 | int $0x81 == CD 81 |
| 1935 | int $0x82 == CD 82 |
| 1936 | sysenter == 0F 34 |
| 1937 | */ |
| 1938 | { |
| 1939 | UChar *p = (UChar *)arch->vex.guest_EIP; |
| 1940 | Bool ok = (p[0] == 0xCD && p[1] == 0x80) |
| 1941 | || (p[0] == 0xCD && p[1] == 0x81) |
| 1942 | || (p[0] == 0xCD && p[1] == 0x82) |
| 1943 | || (p[0] == 0x0F && p[1] == 0x34); |
| 1944 | if (!ok) |
| 1945 | VG_(message)(Vg_DebugMsg, |
| 1946 | "?! restarting over syscall at %#x %02x %02x\n", |
| 1947 | arch->vex.guest_EIP, p[0], p[1]); |
| 1948 | vg_assert(ok); |
| 1949 | } |
| 1950 | |
| 1951 | #elif defined(VGP_amd64_darwin) |
| 1952 | // DDD: #warning GrP fixme amd64 restart unimplemented |
| 1953 | vg_assert(0); |
| 1954 | |
sewardj | b5b8740 | 2011-03-07 16:05:35 +0000 | [diff] [blame] | 1955 | #elif defined(VGP_s390x_linux) |
| 1956 | arch->vex.guest_IA -= 2; // sizeof(syscall) |
| 1957 | |
| 1958 | /* Make sure our caller is actually sane, and we're really backing |
| 1959 | back over a syscall. |
| 1960 | |
| 1961 | syscall == 0A <num> |
| 1962 | */ |
| 1963 | { |
| 1964 | UChar *p = (UChar *)arch->vex.guest_IA; |
| 1965 | if (p[0] != 0x0A) |
| 1966 | VG_(message)(Vg_DebugMsg, |
| 1967 | "?! restarting over syscall at %#llx %02x %02x\n", |
| 1968 | arch->vex.guest_IA, p[0], p[1]); |
| 1969 | |
| 1970 | vg_assert(p[0] == 0x0A); |
| 1971 | } |
sewardj | 5db1540 | 2012-06-07 09:13:21 +0000 | [diff] [blame] | 1972 | |
| 1973 | #elif defined(VGP_mips32_linux) |
| 1974 | |
| 1975 | arch->vex.guest_PC -= 4; // sizeof(mips instr) |
| 1976 | |
| 1977 | /* Make sure our caller is actually sane, and we're really backing |
| 1978 | back over a syscall. |
| 1979 | |
| 1980 | syscall == 00 00 00 0C |
| 1981 | big endian |
| 1982 | syscall == 0C 00 00 00 |
| 1983 | */ |
| 1984 | { |
| 1985 | UChar *p = (UChar *)(arch->vex.guest_PC); |
| 1986 | # if defined (VG_LITTLEENDIAN) |
| 1987 | if (p[0] != 0x0c || p[1] != 0x00 || p[2] != 0x00 || p[3] != 0x00) |
| 1988 | VG_(message)(Vg_DebugMsg, |
| 1989 | "?! restarting over syscall at %#x %02x %02x %02x %02x\n", |
| 1990 | arch->vex.guest_PC, p[0], p[1], p[2], p[3]); |
| 1991 | |
| 1992 | vg_assert(p[0] == 0x0c && p[1] == 0x00 && p[2] == 0x00 && p[3] == 0x00); |
| 1993 | # elif defined (VG_BIGENDIAN) |
| 1994 | if (p[0] != 0x00 || p[1] != 0x00 || p[2] != 0x00 || p[3] != 0x0c) |
| 1995 | VG_(message)(Vg_DebugMsg, |
| 1996 | "?! restarting over syscall at %#x %02x %02x %02x %02x\n", |
| 1997 | arch->vex.guest_PC, p[0], p[1], p[2], p[3]); |
| 1998 | |
| 1999 | vg_assert(p[0] == 0x00 && p[1] == 0x00 && p[2] == 0x00 && p[3] == 0x0c); |
| 2000 | # else |
| 2001 | # error "Unknown endianness" |
| 2002 | # endif |
| 2003 | } |
| 2004 | |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 2005 | #else |
cerion | 7b2c38c | 2005-06-23 07:52:54 +0000 | [diff] [blame] | 2006 | # error "ML_(fixup_guest_state_to_restart_syscall): unknown plat" |
cerion | 85665ca | 2005-06-20 15:51:07 +0000 | [diff] [blame] | 2007 | #endif |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2008 | } |
| 2009 | |
sewardj | 5db1540 | 2012-06-07 09:13:21 +0000 | [diff] [blame] | 2010 | |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2011 | /* |
| 2012 | Fix up the guest state when a syscall is interrupted by a signal |
| 2013 | and so has been forced to return 'sysret'. |
| 2014 | |
| 2015 | To do this, we determine the precise state of the syscall by |
| 2016 | looking at the (real) IP at the time the signal happened. The |
| 2017 | syscall sequence looks like: |
| 2018 | |
| 2019 | 1. unblock signals |
| 2020 | 2. perform syscall |
sewardj | 5db1540 | 2012-06-07 09:13:21 +0000 | [diff] [blame] | 2021 | 3. save result to guest state (EAX, RAX, R3+CR0.SO, R0, V0) |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2022 | 4. re-block signals |
| 2023 | |
| 2024 | If a signal |
| 2025 | happens at Then Why? |
| 2026 | [1-2) restart nothing has happened (restart syscall) |
| 2027 | [2] restart syscall hasn't started, or kernel wants to restart |
| 2028 | [2-3) save syscall complete, but results not saved |
| 2029 | [3-4) syscall complete, results saved |
| 2030 | |
| 2031 | Sometimes we never want to restart an interrupted syscall (because |
| 2032 | sigaction says not to), so we only restart if "restart" is True. |
| 2033 | |
| 2034 | This will also call VG_(post_syscall) if the syscall has actually |
| 2035 | completed (either because it was interrupted, or because it |
| 2036 | actually finished). It will not call VG_(post_syscall) if the |
| 2037 | syscall is set up for restart, which means that the pre-wrapper may |
| 2038 | get called multiple times. |
| 2039 | */ |
| 2040 | |
| 2041 | void |
| 2042 | VG_(fixup_guest_state_after_syscall_interrupted)( ThreadId tid, |
| 2043 | Addr ip, |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 2044 | SysRes sres, |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2045 | Bool restart) |
| 2046 | { |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 2047 | /* Note that we don't know the syscall number here, since (1) in |
| 2048 | general there's no reliable way to get hold of it short of |
| 2049 | stashing it in the guest state before the syscall, and (2) in |
| 2050 | any case we don't need to know it for the actions done by this |
| 2051 | routine. |
njn | cda2f0f | 2009-05-18 02:12:08 +0000 | [diff] [blame] | 2052 | |
| 2053 | Furthermore, 'sres' is only used in the case where the syscall |
| 2054 | is complete, but the result has not been committed to the guest |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 2055 | state yet. In any other situation it will be meaningless and |
| 2056 | therefore ignored. */ |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2057 | |
| 2058 | ThreadState* tst; |
| 2059 | SyscallStatus canonical; |
| 2060 | ThreadArchState* th_regs; |
| 2061 | SyscallInfo* sci; |
| 2062 | |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 2063 | /* Compute some Booleans indicating which range we're in. */ |
| 2064 | Bool outside_range, |
| 2065 | in_setup_to_restart, // [1,2) in the .S files |
| 2066 | at_restart, // [2] in the .S files |
| 2067 | in_complete_to_committed, // [3,4) in the .S files |
| 2068 | in_committed_to_finished; // [4,5) in the .S files |
| 2069 | |
sewardj | 6e9de46 | 2011-06-28 07:25:29 +0000 | [diff] [blame] | 2070 | # if defined(VGO_linux) |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 2071 | outside_range |
| 2072 | = ip < ML_(blksys_setup) || ip >= ML_(blksys_finished); |
| 2073 | in_setup_to_restart |
| 2074 | = ip >= ML_(blksys_setup) && ip < ML_(blksys_restart); |
| 2075 | at_restart |
| 2076 | = ip == ML_(blksys_restart); |
| 2077 | in_complete_to_committed |
| 2078 | = ip >= ML_(blksys_complete) && ip < ML_(blksys_committed); |
| 2079 | in_committed_to_finished |
| 2080 | = ip >= ML_(blksys_committed) && ip < ML_(blksys_finished); |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 2081 | # elif defined(VGO_darwin) |
| 2082 | outside_range |
| 2083 | = (ip < ML_(blksys_setup_MACH) || ip >= ML_(blksys_finished_MACH)) |
| 2084 | && (ip < ML_(blksys_setup_MDEP) || ip >= ML_(blksys_finished_MDEP)) |
| 2085 | && (ip < ML_(blksys_setup_UNIX) || ip >= ML_(blksys_finished_UNIX)); |
| 2086 | in_setup_to_restart |
| 2087 | = (ip >= ML_(blksys_setup_MACH) && ip < ML_(blksys_restart_MACH)) |
| 2088 | || (ip >= ML_(blksys_setup_MDEP) && ip < ML_(blksys_restart_MDEP)) |
| 2089 | || (ip >= ML_(blksys_setup_UNIX) && ip < ML_(blksys_restart_UNIX)); |
| 2090 | at_restart |
| 2091 | = (ip == ML_(blksys_restart_MACH)) |
| 2092 | || (ip == ML_(blksys_restart_MDEP)) |
| 2093 | || (ip == ML_(blksys_restart_UNIX)); |
| 2094 | in_complete_to_committed |
| 2095 | = (ip >= ML_(blksys_complete_MACH) && ip < ML_(blksys_committed_MACH)) |
| 2096 | || (ip >= ML_(blksys_complete_MDEP) && ip < ML_(blksys_committed_MDEP)) |
| 2097 | || (ip >= ML_(blksys_complete_UNIX) && ip < ML_(blksys_committed_UNIX)); |
| 2098 | in_committed_to_finished |
| 2099 | = (ip >= ML_(blksys_committed_MACH) && ip < ML_(blksys_finished_MACH)) |
| 2100 | || (ip >= ML_(blksys_committed_MDEP) && ip < ML_(blksys_finished_MDEP)) |
| 2101 | || (ip >= ML_(blksys_committed_UNIX) && ip < ML_(blksys_finished_UNIX)); |
| 2102 | /* 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] | 2103 | # else |
| 2104 | # error "Unknown OS" |
| 2105 | # endif |
| 2106 | |
| 2107 | if (VG_(clo_trace_signals)) |
| 2108 | VG_(message)( Vg_DebugMsg, |
| 2109 | "interrupted_syscall: tid=%d, ip=0x%llx, " |
tom | d864cad | 2009-12-01 10:25:12 +0000 | [diff] [blame] | 2110 | "restart=%s, sres.isErr=%s, sres.val=%lld\n", |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 2111 | (Int)tid, |
| 2112 | (ULong)ip, |
| 2113 | restart ? "True" : "False", |
| 2114 | sr_isError(sres) ? "True" : "False", |
| 2115 | (Long)(sr_isError(sres) ? sr_Err(sres) : sr_Res(sres)) ); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2116 | |
| 2117 | vg_assert(VG_(is_valid_tid)(tid)); |
| 2118 | vg_assert(tid >= 1 && tid < VG_N_THREADS); |
| 2119 | vg_assert(VG_(is_running_thread)(tid)); |
| 2120 | |
| 2121 | tst = VG_(get_ThreadState)(tid); |
| 2122 | th_regs = &tst->arch; |
| 2123 | sci = & syscallInfo[tid]; |
| 2124 | |
| 2125 | /* Figure out what the state of the syscall was by examining the |
| 2126 | (real) IP at the time of the signal, and act accordingly. */ |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 2127 | if (outside_range) { |
| 2128 | if (VG_(clo_trace_signals)) |
| 2129 | VG_(message)( Vg_DebugMsg, |
tom | d864cad | 2009-12-01 10:25:12 +0000 | [diff] [blame] | 2130 | " not in syscall at all: hmm, very suspicious\n" ); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2131 | /* Looks like we weren't in a syscall at all. Hmm. */ |
| 2132 | vg_assert(sci->status.what != SsIdle); |
| 2133 | return; |
| 2134 | } |
| 2135 | |
| 2136 | /* We should not be here unless this thread had first started up |
| 2137 | the machinery for a syscall by calling VG_(client_syscall). |
| 2138 | Hence: */ |
| 2139 | vg_assert(sci->status.what != SsIdle); |
| 2140 | |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 2141 | /* now, do one of four fixup actions, depending on where the IP has |
| 2142 | got to. */ |
| 2143 | |
| 2144 | if (in_setup_to_restart) { |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2145 | /* syscall hasn't even started; go around again */ |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 2146 | if (VG_(clo_trace_signals)) |
tom | d864cad | 2009-12-01 10:25:12 +0000 | [diff] [blame] | 2147 | VG_(message)( Vg_DebugMsg, " not started: restarting\n"); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2148 | vg_assert(sci->status.what == SsHandToKernel); |
sewardj | 7eb7c58 | 2005-06-23 01:02:53 +0000 | [diff] [blame] | 2149 | ML_(fixup_guest_state_to_restart_syscall)(th_regs); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2150 | } |
| 2151 | |
| 2152 | else |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 2153 | if (at_restart) { |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2154 | /* We're either about to run the syscall, or it was interrupted |
| 2155 | and the kernel restarted it. Restart if asked, otherwise |
| 2156 | EINTR it. */ |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 2157 | if (restart) { |
| 2158 | if (VG_(clo_trace_signals)) |
tom | d864cad | 2009-12-01 10:25:12 +0000 | [diff] [blame] | 2159 | VG_(message)( Vg_DebugMsg, " at syscall instr: restarting\n"); |
sewardj | 7eb7c58 | 2005-06-23 01:02:53 +0000 | [diff] [blame] | 2160 | ML_(fixup_guest_state_to_restart_syscall)(th_regs); |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 2161 | } else { |
| 2162 | if (VG_(clo_trace_signals)) |
tom | d864cad | 2009-12-01 10:25:12 +0000 | [diff] [blame] | 2163 | VG_(message)( Vg_DebugMsg, " at syscall instr: returning EINTR\n"); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2164 | canonical = convert_SysRes_to_SyscallStatus( |
| 2165 | VG_(mk_SysRes_Error)( VKI_EINTR ) |
| 2166 | ); |
sewardj | 1829053 | 2007-03-19 13:38:11 +0000 | [diff] [blame] | 2167 | if (!(sci->flags & SfNoWriteResult)) |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 2168 | putSyscallStatusIntoGuestState( tid, &canonical, &th_regs->vex ); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2169 | sci->status = canonical; |
| 2170 | VG_(post_syscall)(tid); |
| 2171 | } |
| 2172 | } |
| 2173 | |
| 2174 | else |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 2175 | if (in_complete_to_committed) { |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2176 | /* Syscall complete, but result hasn't been written back yet. |
| 2177 | Write the SysRes we were supplied with back to the guest |
| 2178 | state. */ |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 2179 | if (VG_(clo_trace_signals)) |
| 2180 | VG_(message)( Vg_DebugMsg, |
tom | d864cad | 2009-12-01 10:25:12 +0000 | [diff] [blame] | 2181 | " completed, but uncommitted: committing\n"); |
sewardj | ef1cf8b | 2006-10-17 01:47:30 +0000 | [diff] [blame] | 2182 | canonical = convert_SysRes_to_SyscallStatus( sres ); |
sewardj | 1829053 | 2007-03-19 13:38:11 +0000 | [diff] [blame] | 2183 | if (!(sci->flags & SfNoWriteResult)) |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 2184 | putSyscallStatusIntoGuestState( tid, &canonical, &th_regs->vex ); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2185 | sci->status = canonical; |
| 2186 | VG_(post_syscall)(tid); |
| 2187 | } |
| 2188 | |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 2189 | else |
| 2190 | if (in_committed_to_finished) { |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2191 | /* Result committed, but the signal mask has not been restored; |
| 2192 | we expect our caller (the signal handler) will have fixed |
| 2193 | this up. */ |
njn | 40dd69e | 2009-05-21 23:53:40 +0000 | [diff] [blame] | 2194 | if (VG_(clo_trace_signals)) |
| 2195 | VG_(message)( Vg_DebugMsg, |
tom | d864cad | 2009-12-01 10:25:12 +0000 | [diff] [blame] | 2196 | " completed and committed: nothing to do\n"); |
tom | bbcf0e2 | 2009-10-29 14:03:02 +0000 | [diff] [blame] | 2197 | getSyscallStatusFromGuestState( &sci->status, &th_regs->vex ); |
| 2198 | vg_assert(sci->status.what == SsComplete); |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2199 | VG_(post_syscall)(tid); |
| 2200 | } |
| 2201 | |
| 2202 | else |
| 2203 | VG_(core_panic)("?? strange syscall interrupt state?"); |
| 2204 | |
| 2205 | /* In all cases, the syscall is now finished (even if we called |
cerion | 7b2c38c | 2005-06-23 07:52:54 +0000 | [diff] [blame] | 2206 | ML_(fixup_guest_state_to_restart_syscall), since that just |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2207 | re-positions the guest's IP for another go at it). So we need |
| 2208 | to record that fact. */ |
| 2209 | sci->status.what = SsIdle; |
| 2210 | } |
| 2211 | |
| 2212 | |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 2213 | #if defined(VGO_darwin) |
| 2214 | // Clean up after workq_ops(WQOPS_THREAD_RETURN) jumped to wqthread_hijack. |
| 2215 | // This is similar to VG_(fixup_guest_state_after_syscall_interrupted). |
| 2216 | // This longjmps back to the scheduler. |
| 2217 | void ML_(wqthread_continue_NORETURN)(ThreadId tid) |
| 2218 | { |
| 2219 | ThreadState* tst; |
| 2220 | SyscallInfo* sci; |
| 2221 | |
| 2222 | VG_(acquire_BigLock)(tid, "wqthread_continue_NORETURN"); |
| 2223 | |
njn | 1a1e95c | 2009-06-03 06:50:06 +0000 | [diff] [blame] | 2224 | PRINT("SYSCALL[%d,%d](%s) workq_ops() starting new workqueue item\n", |
| 2225 | VG_(getpid)(), tid, VG_SYSNUM_STRING(__NR_workq_ops)); |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 2226 | |
| 2227 | vg_assert(VG_(is_valid_tid)(tid)); |
| 2228 | vg_assert(tid >= 1 && tid < VG_N_THREADS); |
| 2229 | vg_assert(VG_(is_running_thread)(tid)); |
| 2230 | |
| 2231 | tst = VG_(get_ThreadState)(tid); |
| 2232 | sci = & syscallInfo[tid]; |
| 2233 | vg_assert(sci->status.what != SsIdle); |
| 2234 | vg_assert(tst->os_state.wq_jmpbuf_valid); // check this BEFORE post_syscall |
| 2235 | |
| 2236 | // Pretend the syscall completed normally, but don't touch the thread state. |
| 2237 | sci->status = convert_SysRes_to_SyscallStatus( VG_(mk_SysRes_Success)(0) ); |
| 2238 | sci->flags |= SfNoWriteResult; |
| 2239 | VG_(post_syscall)(tid); |
| 2240 | |
| 2241 | sci->status.what = SsIdle; |
| 2242 | |
| 2243 | vg_assert(tst->sched_jmpbuf_valid); |
sewardj | 38a2859 | 2011-04-11 22:08:06 +0000 | [diff] [blame] | 2244 | VG_MINIMAL_LONGJMP(tst->sched_jmpbuf); |
njn | f76d27a | 2009-05-28 01:53:07 +0000 | [diff] [blame] | 2245 | |
| 2246 | /* NOTREACHED */ |
| 2247 | vg_assert(0); |
| 2248 | } |
| 2249 | #endif |
| 2250 | |
| 2251 | |
sewardj | 1ae3f3a | 2005-09-28 10:47:38 +0000 | [diff] [blame] | 2252 | /* --------------------------------------------------------------------- |
| 2253 | A place to store the where-to-call-when-really-done pointer |
| 2254 | ------------------------------------------------------------------ */ |
| 2255 | |
| 2256 | // When the final thread is done, where shall I call to shutdown the |
| 2257 | // system cleanly? Is set once at startup (in m_main) and never |
| 2258 | // changes after that. Is basically a pointer to the exit |
| 2259 | // continuation. This is all just a nasty hack to avoid calling |
| 2260 | // directly from m_syswrap to m_main at exit, since that would cause |
| 2261 | // m_main to become part of a module cycle, which is silly. |
| 2262 | void (* VG_(address_of_m_main_shutdown_actions_NORETURN) ) |
| 2263 | (ThreadId,VgSchedReturnCode) |
| 2264 | = NULL; |
| 2265 | |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2266 | /*--------------------------------------------------------------------*/ |
njn | c1b0181 | 2005-06-17 22:19:06 +0000 | [diff] [blame] | 2267 | /*--- end ---*/ |
sewardj | a8d8e23 | 2005-06-07 20:04:56 +0000 | [diff] [blame] | 2268 | /*--------------------------------------------------------------------*/ |