sewardj | de4a1d0 | 2002-03-22 01:27:54 +0000 | [diff] [blame] | 1 | |
| 2 | /*--------------------------------------------------------------------*/ |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 3 | /*--- Implementation of POSIX signals. vg_signals.c ---*/ |
sewardj | de4a1d0 | 2002-03-22 01:27:54 +0000 | [diff] [blame] | 4 | /*--------------------------------------------------------------------*/ |
| 5 | |
| 6 | /* |
njn | b9c427c | 2004-12-01 14:14:42 +0000 | [diff] [blame] | 7 | This file is part of Valgrind, a dynamic binary instrumentation |
| 8 | framework. |
sewardj | de4a1d0 | 2002-03-22 01:27:54 +0000 | [diff] [blame] | 9 | |
njn | 5361242 | 2005-03-12 16:22:54 +0000 | [diff] [blame] | 10 | Copyright (C) 2000-2005 Julian Seward |
sewardj | de4a1d0 | 2002-03-22 01:27:54 +0000 | [diff] [blame] | 11 | jseward@acm.org |
sewardj | de4a1d0 | 2002-03-22 01:27:54 +0000 | [diff] [blame] | 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 | |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 28 | The GNU General Public License is contained in the file COPYING. |
sewardj | de4a1d0 | 2002-03-22 01:27:54 +0000 | [diff] [blame] | 29 | */ |
| 30 | |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 31 | /* |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 32 | Signal handling. |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 33 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 34 | There are 4 distinct classes of signal: |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 35 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 36 | 1. Synchronous, instruction-generated (SIGILL, FPE, BUS, SEGV and |
| 37 | TRAP): these are signals as a result of an instruction fault. If |
| 38 | we get one while running client code, then we just do the |
| 39 | appropriate thing. If it happens while running Valgrind code, then |
| 40 | it indicates a Valgrind bug. Note that we "manually" implement |
| 41 | automatic stack growth, such that if a fault happens near the |
| 42 | client process stack, it is extended in the same way the kernel |
| 43 | would, and the fault is never reported to the client program. |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 44 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 45 | 2. Asynchronous varients of the above signals: If the kernel tries |
| 46 | to deliver a sync signal while it is blocked, it just kills the |
| 47 | process. Therefore, we can't block those signals if we want to be |
| 48 | able to report on bugs in Valgrind. This means that we're also |
| 49 | open to receiving those signals from other processes, sent with |
| 50 | kill. We could get away with just dropping them, since they aren't |
| 51 | really signals that processes send to each other. |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 52 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 53 | 3. Synchronous, general signals. If a thread/process sends itself |
| 54 | a signal with kill, its expected to be synchronous: ie, the signal |
| 55 | will have been delivered by the time the syscall finishes. |
| 56 | |
| 57 | 4. Asyncronous, general signals. All other signals, sent by |
| 58 | another process with kill. These are generally blocked, except for |
| 59 | two special cases: we poll for them each time we're about to run a |
| 60 | thread for a time quanta, and while running blocking syscalls. |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 61 | |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 62 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 63 | In addition, we define two signals for internal use: SIGVGCHLD and |
| 64 | SIGVGKILL. SIGVGCHLD is used to indicate thread death to any |
| 65 | reaping thread (the master thread). It is always blocked and never |
| 66 | delivered as a signal; it is always polled with sigtimedwait. |
| 67 | |
| 68 | SIGVGKILL is used to terminate threads. When one thread wants |
| 69 | another to exit, it will set its exitreason and send it SIGVGKILL |
| 70 | if it appears to be blocked in a syscall. |
| 71 | |
| 72 | |
| 73 | We use a kernel thread for each application thread. When the |
| 74 | thread allows itself to be open to signals, it sets the thread |
| 75 | signal mask to what the client application set it to. This means |
| 76 | that we get the kernel to do all signal routing: under Valgrind, |
| 77 | signals get delivered in the same way as in the non-Valgrind case |
| 78 | (the exception being for the sync signal set, since they're almost |
| 79 | always unblocked). |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 80 | */ |
sewardj | de4a1d0 | 2002-03-22 01:27:54 +0000 | [diff] [blame] | 81 | |
nethercote | f1e5e15 | 2004-09-01 23:58:16 +0000 | [diff] [blame] | 82 | #include "core.h" |
sewardj | de4a1d0 | 2002-03-22 01:27:54 +0000 | [diff] [blame] | 83 | |
njn | 2521d32 | 2005-05-08 14:45:13 +0000 | [diff] [blame] | 84 | #include "pub_core_aspacemgr.h" |
njn | d2b1711 | 2005-04-19 04:10:25 +0000 | [diff] [blame] | 85 | #include "pub_core_errormgr.h" |
njn | 2024234 | 2005-05-16 23:31:24 +0000 | [diff] [blame] | 86 | #include "pub_core_options.h" |
sewardj | 985fabb | 2005-04-24 14:18:14 +0000 | [diff] [blame] | 87 | #include "pub_core_sigframe.h" |
njn | 2521d32 | 2005-05-08 14:45:13 +0000 | [diff] [blame] | 88 | #include "pub_core_syscalls.h" |
njn | 43b9a8a | 2005-05-10 04:37:01 +0000 | [diff] [blame] | 89 | #include "pub_core_tooliface.h" |
sewardj | 985fabb | 2005-04-24 14:18:14 +0000 | [diff] [blame] | 90 | |
njn | d2b1711 | 2005-04-19 04:10:25 +0000 | [diff] [blame] | 91 | |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 92 | /* Define to give more sanity checking for signals. */ |
| 93 | #define DEBUG_SIGNALS |
| 94 | |
| 95 | |
| 96 | /* --------------------------------------------------------------------- |
| 97 | Forwards decls. |
| 98 | ------------------------------------------------------------------ */ |
| 99 | |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 100 | static void sync_signalhandler ( Int sigNo, vki_siginfo_t *info, struct vki_ucontext * ); |
| 101 | static void async_signalhandler ( Int sigNo, vki_siginfo_t *info, struct vki_ucontext * ); |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 102 | static void sigvgkill_handler ( Int sigNo, vki_siginfo_t *info, struct vki_ucontext * ); |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 103 | |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 104 | static const Char *signame(Int sigNo); |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 105 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 106 | /* Maximum usable signal. */ |
| 107 | Int VG_(max_signal) = _VKI_NSIG; |
nethercote | 759dda3 | 2004-08-07 18:16:56 +0000 | [diff] [blame] | 108 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 109 | #define N_QUEUED_SIGNALS 8 |
nethercote | 759dda3 | 2004-08-07 18:16:56 +0000 | [diff] [blame] | 110 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 111 | typedef struct SigQueue { |
| 112 | Int next; |
| 113 | vki_siginfo_t sigs[N_QUEUED_SIGNALS]; |
| 114 | } SigQueue; |
nethercote | 759dda3 | 2004-08-07 18:16:56 +0000 | [diff] [blame] | 115 | |
njn | 605f488 | 2005-05-29 17:50:40 +0000 | [diff] [blame] | 116 | #if defined(VGP_x86_linux) |
| 117 | # define VGP_UCONTEXT_INSTR_PTR(uc) ((uc)->uc_mcontext.eip) |
| 118 | # define VGP_UCONTEXT_STACK_PTR(uc) ((uc)->uc_mcontext.esp) |
| 119 | # define VGP_UCONTEXT_FRAME_PTR(uc) ((uc)->uc_mcontext.ebp) |
| 120 | # define VGP_UCONTEXT_SYSCALL_NUM(uc) ((uc)->uc_mcontext.eax) |
| 121 | # define VGP_UCONTEXT_SYSCALL_RET(uc) ((uc)->uc_mcontext.eax) |
| 122 | #elif defined(VGP_amd64_linux) |
| 123 | # define VGP_UCONTEXT_INSTR_PTR(uc) ((uc)->uc_mcontext.rip) |
| 124 | # define VGP_UCONTEXT_STACK_PTR(uc) ((uc)->uc_mcontext.rsp) |
| 125 | # define VGP_UCONTEXT_FRAME_PTR(uc) ((uc)->uc_mcontext.rbp) |
| 126 | # define VGP_UCONTEXT_SYSCALL_NUM(uc) ((uc)->uc_mcontext.rax) |
| 127 | # define VGP_UCONTEXT_SYSCALL_RET(uc) ((uc)->uc_mcontext.rax) |
| 128 | #elif defined(VGP_arm_linux) |
| 129 | # define VGP_UCONTEXT_INSTR_PTR(uc) ((uc)->uc_mcontext.arm_pc) |
| 130 | # define VGP_UCONTEXT_STACK_PTR(uc) ((uc)->uc_mcontext.arm_sp) |
| 131 | # define VGP_UCONTEXT_FRAME_PTR(uc) ((uc)->uc_mcontext.arm_fp) |
| 132 | # define VGP_UCONTEXT_SYSCALL_NUM(uc) ((uc)->uc_mcontext.arm_r0) |
| 133 | # error VGP_UCONTEXT_SYSCALL_RET undefined for ARM/Linux |
| 134 | #else |
| 135 | # error Unknown platform |
| 136 | #endif |
| 137 | |
nethercote | 759dda3 | 2004-08-07 18:16:56 +0000 | [diff] [blame] | 138 | /* --------------------------------------------------------------------- |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 139 | HIGH LEVEL STUFF TO DO WITH SIGNALS: POLICY (MOSTLY) |
| 140 | ------------------------------------------------------------------ */ |
| 141 | |
sewardj | de4a1d0 | 2002-03-22 01:27:54 +0000 | [diff] [blame] | 142 | /* --------------------------------------------------------------------- |
sewardj | de4a1d0 | 2002-03-22 01:27:54 +0000 | [diff] [blame] | 143 | Signal state for this process. |
| 144 | ------------------------------------------------------------------ */ |
| 145 | |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 146 | |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 147 | /* Base-ment of these arrays[_VKI_NSIG]. |
sewardj | b48e500 | 2002-05-13 00:16:03 +0000 | [diff] [blame] | 148 | |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 149 | Valid signal numbers are 1 .. _VKI_NSIG inclusive. |
sewardj | b48e500 | 2002-05-13 00:16:03 +0000 | [diff] [blame] | 150 | Rather than subtracting 1 for indexing these arrays, which |
| 151 | is tedious and error-prone, they are simply dimensioned 1 larger, |
| 152 | and entry [0] is not used. |
| 153 | */ |
| 154 | |
sewardj | b48e500 | 2002-05-13 00:16:03 +0000 | [diff] [blame] | 155 | |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 156 | /* ----------------------------------------------------- |
| 157 | Static client signal state (SCSS). This is the state |
| 158 | that the client thinks it has the kernel in. |
| 159 | SCSS records verbatim the client's settings. These |
| 160 | are mashed around only when SKSS is calculated from it. |
| 161 | -------------------------------------------------- */ |
sewardj | b48e500 | 2002-05-13 00:16:03 +0000 | [diff] [blame] | 162 | |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 163 | typedef |
| 164 | struct { |
| 165 | void* scss_handler; /* VKI_SIG_DFL or VKI_SIG_IGN or ptr to |
| 166 | client's handler */ |
| 167 | UInt scss_flags; |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 168 | vki_sigset_t scss_mask; |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 169 | void* scss_restorer; /* where sigreturn goes */ |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 170 | } |
| 171 | SCSS_Per_Signal; |
sewardj | b48e500 | 2002-05-13 00:16:03 +0000 | [diff] [blame] | 172 | |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 173 | typedef |
| 174 | struct { |
sewardj | 2342c97 | 2002-05-22 23:34:20 +0000 | [diff] [blame] | 175 | /* per-signal info */ |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 176 | SCSS_Per_Signal scss_per_sig[1+_VKI_NSIG]; |
sewardj | 2342c97 | 2002-05-22 23:34:20 +0000 | [diff] [blame] | 177 | |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 178 | /* Additional elements to SCSS not stored here: |
| 179 | - for each thread, the thread's blocking mask |
| 180 | - for each thread in WaitSIG, the set of waited-on sigs |
| 181 | */ |
| 182 | } |
| 183 | SCSS; |
sewardj | b48e500 | 2002-05-13 00:16:03 +0000 | [diff] [blame] | 184 | |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 185 | static SCSS scss; |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 186 | |
| 187 | |
| 188 | /* ----------------------------------------------------- |
| 189 | Static kernel signal state (SKSS). This is the state |
| 190 | that we have the kernel in. It is computed from SCSS. |
| 191 | -------------------------------------------------- */ |
| 192 | |
| 193 | /* Let's do: |
| 194 | sigprocmask assigns to all thread masks |
| 195 | so that at least everything is always consistent |
| 196 | Flags: |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 197 | SA_SIGINFO -- we always set it, and honour it for the client |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 198 | SA_NOCLDSTOP -- passed to kernel |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 199 | SA_ONESHOT or SA_RESETHAND -- pass through |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 200 | SA_RESTART -- we observe this but set our handlers to always restart |
| 201 | SA_NOMASK or SA_NODEFER -- we observe this, but our handlers block everything |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 202 | SA_ONSTACK -- pass through |
| 203 | SA_NOCLDWAIT -- pass through |
sewardj | b48e500 | 2002-05-13 00:16:03 +0000 | [diff] [blame] | 204 | */ |
sewardj | de4a1d0 | 2002-03-22 01:27:54 +0000 | [diff] [blame] | 205 | |
sewardj | 77e466c | 2002-04-14 02:29:29 +0000 | [diff] [blame] | 206 | |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 207 | typedef |
| 208 | struct { |
| 209 | void* skss_handler; /* VKI_SIG_DFL or VKI_SIG_IGN |
| 210 | or ptr to our handler */ |
| 211 | UInt skss_flags; |
| 212 | /* There is no skss_mask, since we know that we will always ask |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 213 | for all signals to be blocked in our sighandlers. */ |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 214 | /* Also there is no skss_restorer. */ |
| 215 | } |
| 216 | SKSS_Per_Signal; |
sewardj | de4a1d0 | 2002-03-22 01:27:54 +0000 | [diff] [blame] | 217 | |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 218 | typedef |
| 219 | struct { |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 220 | SKSS_Per_Signal skss_per_sig[1+_VKI_NSIG]; |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 221 | } |
| 222 | SKSS; |
| 223 | |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 224 | static SKSS skss; |
sewardj | de4a1d0 | 2002-03-22 01:27:54 +0000 | [diff] [blame] | 225 | |
njn | 07ef6c0 | 2005-05-18 19:43:09 +0000 | [diff] [blame] | 226 | static Bool is_sig_ign(Int sigNo) |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 227 | { |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 228 | vg_assert(sigNo >= 1 && sigNo <= _VKI_NSIG); |
sewardj | 2e93c50 | 2002-04-12 11:12:52 +0000 | [diff] [blame] | 229 | |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 230 | return scss.scss_per_sig[sigNo].scss_handler == VKI_SIG_IGN; |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 231 | } |
sewardj | b48e500 | 2002-05-13 00:16:03 +0000 | [diff] [blame] | 232 | |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 233 | /* --------------------------------------------------------------------- |
| 234 | Compute the SKSS required by the current SCSS. |
| 235 | ------------------------------------------------------------------ */ |
| 236 | |
sewardj | 4f29ddf | 2002-05-03 22:29:04 +0000 | [diff] [blame] | 237 | static |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 238 | void pp_SKSS ( void ) |
| 239 | { |
| 240 | Int sig; |
| 241 | VG_(printf)("\n\nSKSS:\n"); |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 242 | for (sig = 1; sig <= _VKI_NSIG; sig++) { |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 243 | VG_(printf)("sig %d: handler 0x%x, flags 0x%x\n", sig, |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 244 | skss.skss_per_sig[sig].skss_handler, |
| 245 | skss.skss_per_sig[sig].skss_flags ); |
sewardj | 77e466c | 2002-04-14 02:29:29 +0000 | [diff] [blame] | 246 | |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 247 | } |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 248 | } |
| 249 | |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 250 | /* This is the core, clever bit. Computation is as follows: |
| 251 | |
| 252 | For each signal |
| 253 | handler = if client has a handler, then our handler |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 254 | else if client is DFL, then our handler as well |
| 255 | else (client must be IGN) |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 256 | then hander is IGN |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 257 | */ |
| 258 | static |
| 259 | void calculate_SKSS_from_SCSS ( SKSS* dst ) |
| 260 | { |
| 261 | Int sig; |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 262 | UInt scss_flags; |
| 263 | UInt skss_flags; |
| 264 | |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 265 | for (sig = 1; sig <= _VKI_NSIG; sig++) { |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 266 | void *skss_handler; |
| 267 | void *scss_handler; |
| 268 | |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 269 | scss_handler = scss.scss_per_sig[sig].scss_handler; |
| 270 | scss_flags = scss.scss_per_sig[sig].scss_flags; |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 271 | |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 272 | switch(sig) { |
| 273 | case VKI_SIGSEGV: |
| 274 | case VKI_SIGBUS: |
| 275 | case VKI_SIGFPE: |
| 276 | case VKI_SIGILL: |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 277 | case VKI_SIGTRAP: |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 278 | /* For these, we always want to catch them and report, even |
| 279 | if the client code doesn't. */ |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 280 | skss_handler = sync_signalhandler; |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 281 | break; |
| 282 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 283 | case VKI_SIGCONT: |
| 284 | /* Let the kernel handle SIGCONT unless the client is actually |
| 285 | catching it. */ |
njn | a530fc6 | 2005-03-13 04:46:36 +0000 | [diff] [blame] | 286 | case VKI_SIGCHLD: |
| 287 | case VKI_SIGWINCH: |
| 288 | case VKI_SIGURG: |
| 289 | /* For signals which are have a default action of Ignore, |
| 290 | only set a handler if the client has set a signal handler. |
| 291 | Otherwise the kernel will interrupt a syscall which |
| 292 | wouldn't have otherwise been interrupted. */ |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 293 | if (scss.scss_per_sig[sig].scss_handler == VKI_SIG_DFL) |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 294 | skss_handler = VKI_SIG_DFL; |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 295 | else if (scss.scss_per_sig[sig].scss_handler == VKI_SIG_IGN) |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 296 | skss_handler = VKI_SIG_IGN; |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 297 | else |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 298 | skss_handler = async_signalhandler; |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 299 | break; |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 300 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 301 | default: |
njn | a530fc6 | 2005-03-13 04:46:36 +0000 | [diff] [blame] | 302 | // VKI_SIGVG* are runtime variables, so we can't make them |
| 303 | // cases in the switch, so we handle them in the 'default' case. |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 304 | if (sig == VKI_SIGVGKILL) |
| 305 | skss_handler = sigvgkill_handler; |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 306 | else { |
| 307 | if (scss_handler == VKI_SIG_IGN) |
| 308 | skss_handler = VKI_SIG_IGN; |
| 309 | else |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 310 | skss_handler = async_signalhandler; |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 311 | } |
| 312 | break; |
| 313 | } |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 314 | |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 315 | /* Flags */ |
| 316 | |
| 317 | skss_flags = 0; |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 318 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 319 | /* SA_NOCLDSTOP, SA_NOCLDWAIT: pass to kernel */ |
| 320 | skss_flags |= scss_flags & (VKI_SA_NOCLDSTOP | VKI_SA_NOCLDWAIT); |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 321 | |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 322 | /* SA_ONESHOT: ignore client setting */ |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 323 | |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 324 | /* SA_RESTART: ignore client setting and always set it for us |
| 325 | (even though we never rely on the kernel to restart a |
| 326 | syscall, we observe whether it wanted to restart the syscall |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 327 | or not, which helps VGA_(interrupted_syscall)()) */ |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 328 | skss_flags |= VKI_SA_RESTART; |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 329 | |
| 330 | /* SA_NOMASK: ignore it */ |
| 331 | |
sewardj | 2342c97 | 2002-05-22 23:34:20 +0000 | [diff] [blame] | 332 | /* SA_ONSTACK: client setting is irrelevant here */ |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 333 | /* We don't set a signal stack, so ignore */ |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 334 | |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 335 | /* always ask for SA_SIGINFO */ |
| 336 | skss_flags |= VKI_SA_SIGINFO; |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 337 | |
fitzhardinge | 4f10ada | 2004-06-03 10:00:42 +0000 | [diff] [blame] | 338 | /* use our own restorer */ |
| 339 | skss_flags |= VKI_SA_RESTORER; |
| 340 | |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 341 | /* Create SKSS entry for this signal. */ |
sewardj | 6a3c26e | 2002-05-23 17:09:43 +0000 | [diff] [blame] | 342 | if (sig != VKI_SIGKILL && sig != VKI_SIGSTOP) |
| 343 | dst->skss_per_sig[sig].skss_handler = skss_handler; |
| 344 | else |
| 345 | dst->skss_per_sig[sig].skss_handler = VKI_SIG_DFL; |
| 346 | |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 347 | dst->skss_per_sig[sig].skss_flags = skss_flags; |
| 348 | } |
| 349 | |
| 350 | /* Sanity checks. */ |
nethercote | 5fd72bb | 2004-11-04 19:28:38 +0000 | [diff] [blame] | 351 | vg_assert(dst->skss_per_sig[VKI_SIGKILL].skss_handler == VKI_SIG_DFL); |
| 352 | vg_assert(dst->skss_per_sig[VKI_SIGSTOP].skss_handler == VKI_SIG_DFL); |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 353 | |
| 354 | if (0) |
| 355 | pp_SKSS(); |
| 356 | } |
| 357 | |
| 358 | |
| 359 | /* --------------------------------------------------------------------- |
| 360 | After a possible SCSS change, update SKSS and the kernel itself. |
| 361 | ------------------------------------------------------------------ */ |
| 362 | |
nethercote | 9dd1151 | 2004-08-04 15:31:30 +0000 | [diff] [blame] | 363 | static void handle_SCSS_change ( Bool force_update ) |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 364 | { |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 365 | Int res, sig; |
| 366 | SKSS skss_old; |
| 367 | struct vki_sigaction ksa, ksa_old; |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 368 | |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 369 | /* Remember old SKSS and calculate new one. */ |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 370 | skss_old = skss; |
| 371 | calculate_SKSS_from_SCSS ( &skss ); |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 372 | |
| 373 | /* Compare the new SKSS entries vs the old ones, and update kernel |
| 374 | where they differ. */ |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 375 | for (sig = 1; sig <= VG_(max_signal); sig++) { |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 376 | |
| 377 | /* Trying to do anything with SIGKILL is pointless; just ignore |
| 378 | it. */ |
| 379 | if (sig == VKI_SIGKILL || sig == VKI_SIGSTOP) |
| 380 | continue; |
| 381 | |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 382 | if (!force_update) { |
| 383 | if ((skss_old.skss_per_sig[sig].skss_handler |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 384 | == skss.skss_per_sig[sig].skss_handler) |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 385 | && (skss_old.skss_per_sig[sig].skss_flags |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 386 | == skss.skss_per_sig[sig].skss_flags)) |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 387 | /* no difference */ |
| 388 | continue; |
| 389 | } |
| 390 | |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 391 | ksa.ksa_handler = skss.skss_per_sig[sig].skss_handler; |
| 392 | ksa.sa_flags = skss.skss_per_sig[sig].skss_flags; |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 393 | ksa.sa_restorer = VG_(sigreturn); |
fitzhardinge | 4f10ada | 2004-06-03 10:00:42 +0000 | [diff] [blame] | 394 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 395 | /* block all signals in handler */ |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 396 | VG_(sigfillset)( &ksa.sa_mask ); |
| 397 | VG_(sigdelset)( &ksa.sa_mask, VKI_SIGKILL ); |
| 398 | VG_(sigdelset)( &ksa.sa_mask, VKI_SIGSTOP ); |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 399 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 400 | if (VG_(clo_trace_signals) && VG_(clo_verbosity) > 2) |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 401 | VG_(message)(Vg_DebugMsg, |
| 402 | "setting ksig %d to: hdlr 0x%x, flags 0x%x, " |
| 403 | "mask(63..0) 0x%x 0x%x", |
| 404 | sig, ksa.ksa_handler, |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 405 | ksa.sa_flags, |
| 406 | ksa.sa_mask.sig[1], |
| 407 | ksa.sa_mask.sig[0] |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 408 | ); |
| 409 | |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 410 | res = VG_(sigaction)( sig, &ksa, &ksa_old ); |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 411 | vg_assert(res == 0); |
| 412 | |
| 413 | /* Since we got the old sigaction more or less for free, might |
| 414 | as well extract the maximum sanity-check value from it. */ |
| 415 | if (!force_update) { |
| 416 | vg_assert(ksa_old.ksa_handler |
| 417 | == skss_old.skss_per_sig[sig].skss_handler); |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 418 | vg_assert(ksa_old.sa_flags |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 419 | == skss_old.skss_per_sig[sig].skss_flags); |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 420 | vg_assert(ksa_old.sa_restorer |
fitzhardinge | dc4d4f4 | 2004-06-03 17:12:07 +0000 | [diff] [blame] | 421 | == VG_(sigreturn)); |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 422 | VG_(sigaddset)( &ksa_old.sa_mask, VKI_SIGKILL ); |
| 423 | VG_(sigaddset)( &ksa_old.sa_mask, VKI_SIGSTOP ); |
| 424 | vg_assert(VG_(isfullsigset)( &ksa_old.sa_mask )); |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 425 | } |
| 426 | } |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 427 | } |
| 428 | |
| 429 | |
| 430 | /* --------------------------------------------------------------------- |
| 431 | Update/query SCSS in accordance with client requests. |
| 432 | ------------------------------------------------------------------ */ |
| 433 | |
sewardj | 2342c97 | 2002-05-22 23:34:20 +0000 | [diff] [blame] | 434 | /* Logic for this alt-stack stuff copied directly from do_sigaltstack |
| 435 | in kernel/signal.[ch] */ |
| 436 | |
| 437 | /* True if we are on the alternate signal stack. */ |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 438 | static Bool on_sig_stack ( ThreadId tid, Addr m_SP ) |
sewardj | 2342c97 | 2002-05-22 23:34:20 +0000 | [diff] [blame] | 439 | { |
fitzhardinge | 98c4dc0 | 2004-03-16 08:27:29 +0000 | [diff] [blame] | 440 | ThreadState *tst = VG_(get_ThreadState)(tid); |
| 441 | |
nethercote | 511e406 | 2004-09-11 13:34:08 +0000 | [diff] [blame] | 442 | return (m_SP - (Addr)tst->altstack.ss_sp < tst->altstack.ss_size); |
sewardj | 2342c97 | 2002-05-22 23:34:20 +0000 | [diff] [blame] | 443 | } |
| 444 | |
nethercote | 511e406 | 2004-09-11 13:34:08 +0000 | [diff] [blame] | 445 | static Int sas_ss_flags ( ThreadId tid, Addr m_SP ) |
sewardj | 2342c97 | 2002-05-22 23:34:20 +0000 | [diff] [blame] | 446 | { |
fitzhardinge | 98c4dc0 | 2004-03-16 08:27:29 +0000 | [diff] [blame] | 447 | ThreadState *tst = VG_(get_ThreadState)(tid); |
| 448 | |
| 449 | return (tst->altstack.ss_size == 0 |
sewardj | 2342c97 | 2002-05-22 23:34:20 +0000 | [diff] [blame] | 450 | ? VKI_SS_DISABLE |
nethercote | 511e406 | 2004-09-11 13:34:08 +0000 | [diff] [blame] | 451 | : on_sig_stack(tid, m_SP) ? VKI_SS_ONSTACK : 0); |
sewardj | 2342c97 | 2002-05-22 23:34:20 +0000 | [diff] [blame] | 452 | } |
| 453 | |
| 454 | |
njn | 502badb | 2005-05-08 02:04:49 +0000 | [diff] [blame] | 455 | Int VG_(do_sys_sigaltstack) ( ThreadId tid, vki_stack_t* ss, vki_stack_t* oss ) |
sewardj | 2342c97 | 2002-05-22 23:34:20 +0000 | [diff] [blame] | 456 | { |
njn | 502badb | 2005-05-08 02:04:49 +0000 | [diff] [blame] | 457 | Addr m_SP; |
sewardj | 2342c97 | 2002-05-22 23:34:20 +0000 | [diff] [blame] | 458 | |
| 459 | vg_assert(VG_(is_valid_tid)(tid)); |
njn | cf45fd4 | 2004-11-24 16:30:22 +0000 | [diff] [blame] | 460 | m_SP = STACK_PTR(VG_(threads)[tid].arch); |
sewardj | 2342c97 | 2002-05-22 23:34:20 +0000 | [diff] [blame] | 461 | |
| 462 | if (VG_(clo_trace_signals)) |
| 463 | VG_(message)(Vg_DebugExtraMsg, |
nethercote | 04d3a80 | 2004-11-16 18:26:11 +0000 | [diff] [blame] | 464 | "sys_sigaltstack: tid %d, " |
nethercote | 511e406 | 2004-09-11 13:34:08 +0000 | [diff] [blame] | 465 | "ss %p, oss %p (current SP %p)", |
| 466 | tid, (void*)ss, (void*)oss, (void*)m_SP ); |
sewardj | 2342c97 | 2002-05-22 23:34:20 +0000 | [diff] [blame] | 467 | |
| 468 | if (oss != NULL) { |
fitzhardinge | 98c4dc0 | 2004-03-16 08:27:29 +0000 | [diff] [blame] | 469 | oss->ss_sp = VG_(threads)[tid].altstack.ss_sp; |
| 470 | oss->ss_size = VG_(threads)[tid].altstack.ss_size; |
nethercote | 511e406 | 2004-09-11 13:34:08 +0000 | [diff] [blame] | 471 | oss->ss_flags = VG_(threads)[tid].altstack.ss_flags | sas_ss_flags(tid, m_SP); |
sewardj | 2342c97 | 2002-05-22 23:34:20 +0000 | [diff] [blame] | 472 | } |
| 473 | |
| 474 | if (ss != NULL) { |
njn | cf45fd4 | 2004-11-24 16:30:22 +0000 | [diff] [blame] | 475 | if (on_sig_stack(tid, STACK_PTR(VG_(threads)[tid].arch))) { |
njn | 4fbc86c | 2005-05-08 00:45:11 +0000 | [diff] [blame] | 476 | return -VKI_EPERM; |
sewardj | 2342c97 | 2002-05-22 23:34:20 +0000 | [diff] [blame] | 477 | } |
| 478 | if (ss->ss_flags != VKI_SS_DISABLE |
| 479 | && ss->ss_flags != VKI_SS_ONSTACK |
| 480 | && ss->ss_flags != 0) { |
njn | 4fbc86c | 2005-05-08 00:45:11 +0000 | [diff] [blame] | 481 | return -VKI_EINVAL; |
sewardj | 2342c97 | 2002-05-22 23:34:20 +0000 | [diff] [blame] | 482 | } |
| 483 | if (ss->ss_flags == VKI_SS_DISABLE) { |
fitzhardinge | 98c4dc0 | 2004-03-16 08:27:29 +0000 | [diff] [blame] | 484 | VG_(threads)[tid].altstack.ss_flags = VKI_SS_DISABLE; |
sewardj | 2342c97 | 2002-05-22 23:34:20 +0000 | [diff] [blame] | 485 | } else { |
| 486 | if (ss->ss_size < VKI_MINSIGSTKSZ) { |
njn | 4fbc86c | 2005-05-08 00:45:11 +0000 | [diff] [blame] | 487 | return -VKI_ENOMEM; |
sewardj | 2342c97 | 2002-05-22 23:34:20 +0000 | [diff] [blame] | 488 | } |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 489 | |
nethercote | 20283c6 | 2004-11-04 19:43:22 +0000 | [diff] [blame] | 490 | VG_(threads)[tid].altstack.ss_sp = ss->ss_sp; |
| 491 | VG_(threads)[tid].altstack.ss_size = ss->ss_size; |
fitzhardinge | 98c4dc0 | 2004-03-16 08:27:29 +0000 | [diff] [blame] | 492 | VG_(threads)[tid].altstack.ss_flags = 0; |
sewardj | 2342c97 | 2002-05-22 23:34:20 +0000 | [diff] [blame] | 493 | } |
sewardj | 2342c97 | 2002-05-22 23:34:20 +0000 | [diff] [blame] | 494 | } |
njn | 4fbc86c | 2005-05-08 00:45:11 +0000 | [diff] [blame] | 495 | return 0; |
sewardj | 2342c97 | 2002-05-22 23:34:20 +0000 | [diff] [blame] | 496 | } |
| 497 | |
| 498 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 499 | Int VG_(do_sys_sigaction) ( Int signo, |
| 500 | const struct vki_sigaction *new_act, |
| 501 | struct vki_sigaction *old_act ) |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 502 | { |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 503 | if (VG_(clo_trace_signals)) |
| 504 | VG_(message)(Vg_DebugExtraMsg, |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 505 | "sys_sigaction: sigNo %d, " |
nethercote | 93246cf | 2004-11-04 18:56:47 +0000 | [diff] [blame] | 506 | "new %p, old %p, new flags 0x%llx", |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 507 | signo, (UWord)new_act, (UWord)old_act, |
nethercote | 93246cf | 2004-11-04 18:56:47 +0000 | [diff] [blame] | 508 | (ULong)(new_act ? new_act->sa_flags : 0) ); |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 509 | |
| 510 | /* Rule out various error conditions. The aim is to ensure that if |
| 511 | when the call is passed to the kernel it will definitely |
| 512 | succeed. */ |
| 513 | |
| 514 | /* Reject out-of-range signal numbers. */ |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 515 | if (signo < 1 || signo > VG_(max_signal)) goto bad_signo; |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 516 | |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 517 | /* don't let them use our signals */ |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 518 | if ( (signo > VKI_SIGVGRTUSERMAX) |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 519 | && new_act |
| 520 | && !(new_act->ksa_handler == VKI_SIG_DFL || new_act->ksa_handler == VKI_SIG_IGN) ) |
nethercote | 9c42a0f | 2003-11-17 10:37:19 +0000 | [diff] [blame] | 521 | goto bad_signo_reserved; |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 522 | |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 523 | /* Reject attempts to set a handler (or set ignore) for SIGKILL. */ |
| 524 | if ( (signo == VKI_SIGKILL || signo == VKI_SIGSTOP) |
| 525 | && new_act |
| 526 | && new_act->ksa_handler != VKI_SIG_DFL) |
| 527 | goto bad_sigkill_or_sigstop; |
| 528 | |
| 529 | /* If the client supplied non-NULL old_act, copy the relevant SCSS |
| 530 | entry into it. */ |
| 531 | if (old_act) { |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 532 | old_act->ksa_handler = scss.scss_per_sig[signo].scss_handler; |
| 533 | old_act->sa_flags = scss.scss_per_sig[signo].scss_flags; |
| 534 | old_act->sa_mask = scss.scss_per_sig[signo].scss_mask; |
| 535 | old_act->sa_restorer = scss.scss_per_sig[signo].scss_restorer; |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 536 | } |
| 537 | |
| 538 | /* And now copy new SCSS entry from new_act. */ |
| 539 | if (new_act) { |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 540 | scss.scss_per_sig[signo].scss_handler = new_act->ksa_handler; |
| 541 | scss.scss_per_sig[signo].scss_flags = new_act->sa_flags; |
| 542 | scss.scss_per_sig[signo].scss_mask = new_act->sa_mask; |
| 543 | scss.scss_per_sig[signo].scss_restorer = new_act->sa_restorer; |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 544 | |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 545 | VG_(sigdelset)(&scss.scss_per_sig[signo].scss_mask, VKI_SIGKILL); |
| 546 | VG_(sigdelset)(&scss.scss_per_sig[signo].scss_mask, VKI_SIGSTOP); |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 547 | } |
| 548 | |
| 549 | /* All happy bunnies ... */ |
| 550 | if (new_act) { |
nethercote | 9dd1151 | 2004-08-04 15:31:30 +0000 | [diff] [blame] | 551 | handle_SCSS_change( False /* lazy update */ ); |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 552 | } |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 553 | return 0; |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 554 | |
| 555 | bad_signo: |
sewardj | 9a3d8bd | 2005-05-23 14:47:52 +0000 | [diff] [blame] | 556 | if (VG_(needs).core_errors && VG_(clo_verbosity) >= 1 |
| 557 | && !VG_(clo_xml)) { |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 558 | VG_(message)(Vg_UserMsg, |
nethercote | 9c42a0f | 2003-11-17 10:37:19 +0000 | [diff] [blame] | 559 | "Warning: bad signal number %d in sigaction()", |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 560 | signo); |
sewardj | 9a3d8bd | 2005-05-23 14:47:52 +0000 | [diff] [blame] | 561 | } |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 562 | return -VKI_EINVAL; |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 563 | |
nethercote | 9c42a0f | 2003-11-17 10:37:19 +0000 | [diff] [blame] | 564 | bad_signo_reserved: |
sewardj | 9a3d8bd | 2005-05-23 14:47:52 +0000 | [diff] [blame] | 565 | if (VG_(needs).core_errors && VG_(clo_verbosity) >= 1 |
| 566 | && !VG_(clo_xml)) { |
nethercote | 9c42a0f | 2003-11-17 10:37:19 +0000 | [diff] [blame] | 567 | VG_(message)(Vg_UserMsg, |
| 568 | "Warning: ignored attempt to set %s handler in sigaction();", |
| 569 | signame(signo)); |
| 570 | VG_(message)(Vg_UserMsg, |
| 571 | " the %s signal is used internally by Valgrind", |
| 572 | signame(signo)); |
fitzhardinge | bf45987 | 2003-11-18 16:55:33 +0000 | [diff] [blame] | 573 | } |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 574 | return -VKI_EINVAL; |
nethercote | 9c42a0f | 2003-11-17 10:37:19 +0000 | [diff] [blame] | 575 | |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 576 | bad_sigkill_or_sigstop: |
sewardj | 9a3d8bd | 2005-05-23 14:47:52 +0000 | [diff] [blame] | 577 | if (VG_(needs).core_errors && VG_(clo_verbosity) >= 1 |
| 578 | && !VG_(clo_xml)) { |
njn25 | e49d8e7 | 2002-09-23 09:36:25 +0000 | [diff] [blame] | 579 | VG_(message)(Vg_UserMsg, |
nethercote | 9c42a0f | 2003-11-17 10:37:19 +0000 | [diff] [blame] | 580 | "Warning: ignored attempt to set %s handler in sigaction();", |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 581 | signame(signo)); |
nethercote | 9c42a0f | 2003-11-17 10:37:19 +0000 | [diff] [blame] | 582 | VG_(message)(Vg_UserMsg, |
| 583 | " the %s signal is uncatchable", |
| 584 | signame(signo)); |
sewardj | 9a3d8bd | 2005-05-23 14:47:52 +0000 | [diff] [blame] | 585 | } |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 586 | return -VKI_EINVAL; |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 587 | } |
| 588 | |
| 589 | |
| 590 | static |
| 591 | void do_sigprocmask_bitops ( Int vki_how, |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 592 | vki_sigset_t* orig_set, |
| 593 | vki_sigset_t* modifier ) |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 594 | { |
| 595 | switch (vki_how) { |
| 596 | case VKI_SIG_BLOCK: |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 597 | VG_(sigaddset_from_set)( orig_set, modifier ); |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 598 | break; |
| 599 | case VKI_SIG_UNBLOCK: |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 600 | VG_(sigdelset_from_set)( orig_set, modifier ); |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 601 | break; |
| 602 | case VKI_SIG_SETMASK: |
| 603 | *orig_set = *modifier; |
| 604 | break; |
| 605 | default: |
njn | e427a66 | 2002-10-02 11:08:25 +0000 | [diff] [blame] | 606 | VG_(core_panic)("do_sigprocmask_bitops"); |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 607 | break; |
| 608 | } |
| 609 | } |
| 610 | |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 611 | /* |
| 612 | This updates the thread's signal mask. There's no such thing as a |
| 613 | process-wide signal mask. |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 614 | |
| 615 | Note that the thread signal masks are an implicit part of SCSS, |
| 616 | which is why this routine is allowed to mess with them. |
| 617 | */ |
| 618 | static |
| 619 | void do_setmask ( ThreadId tid, |
| 620 | Int how, |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 621 | vki_sigset_t* newset, |
| 622 | vki_sigset_t* oldset ) |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 623 | { |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 624 | if (VG_(clo_trace_signals)) |
sewardj | a464e5c | 2002-05-23 17:34:49 +0000 | [diff] [blame] | 625 | VG_(message)(Vg_DebugExtraMsg, |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 626 | "do_setmask: tid = %d how = %d (%s), set = %p %08x%08x", |
| 627 | tid, how, |
| 628 | how==VKI_SIG_BLOCK ? "SIG_BLOCK" : ( |
| 629 | how==VKI_SIG_UNBLOCK ? "SIG_UNBLOCK" : ( |
| 630 | how==VKI_SIG_SETMASK ? "SIG_SETMASK" : "???")), |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 631 | newset, newset ? newset->sig[1] : 0, newset ? newset->sig[0] : 0 |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 632 | ); |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 633 | |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 634 | /* Just do this thread. */ |
| 635 | vg_assert(VG_(is_valid_tid)(tid)); |
| 636 | if (oldset) { |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 637 | *oldset = VG_(threads)[tid].sig_mask; |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 638 | if (VG_(clo_trace_signals)) |
| 639 | VG_(message)(Vg_DebugExtraMsg, |
| 640 | "\toldset=%p %08x%08x", |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 641 | oldset, oldset->sig[1], oldset->sig[0]); |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 642 | } |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 643 | if (newset) { |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 644 | do_sigprocmask_bitops (how, &VG_(threads)[tid].sig_mask, newset ); |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 645 | VG_(sigdelset)(&VG_(threads)[tid].sig_mask, VKI_SIGKILL); |
| 646 | VG_(sigdelset)(&VG_(threads)[tid].sig_mask, VKI_SIGSTOP); |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 647 | VG_(threads)[tid].tmp_sig_mask = VG_(threads)[tid].sig_mask; |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 648 | } |
| 649 | } |
| 650 | |
| 651 | |
njn | 4fbc86c | 2005-05-08 00:45:11 +0000 | [diff] [blame] | 652 | int VG_(do_sys_sigprocmask) ( ThreadId tid, |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 653 | Int how, |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 654 | vki_sigset_t* set, |
| 655 | vki_sigset_t* oldset ) |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 656 | { |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 657 | switch(how) { |
| 658 | case VKI_SIG_BLOCK: |
| 659 | case VKI_SIG_UNBLOCK: |
| 660 | case VKI_SIG_SETMASK: |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 661 | vg_assert(VG_(is_valid_tid)(tid)); |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 662 | do_setmask ( tid, how, set, oldset ); |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 663 | VG_(poll_signals)(tid); /* look for any newly deliverable signals */ |
njn | 4fbc86c | 2005-05-08 00:45:11 +0000 | [diff] [blame] | 664 | return 0; |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 665 | |
| 666 | default: |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 667 | VG_(message)(Vg_DebugMsg, |
njn | 02bc4b8 | 2005-05-15 17:28:26 +0000 | [diff] [blame] | 668 | "sigprocmask: unknown 'how' field %d", how); |
njn | 4fbc86c | 2005-05-08 00:45:11 +0000 | [diff] [blame] | 669 | return -VKI_EINVAL; |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 670 | } |
| 671 | } |
| 672 | |
| 673 | |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 674 | /* --------------------------------------------------------------------- |
| 675 | LOW LEVEL STUFF TO DO WITH SIGNALS: IMPLEMENTATION |
| 676 | ------------------------------------------------------------------ */ |
sewardj | 77e466c | 2002-04-14 02:29:29 +0000 | [diff] [blame] | 677 | |
sewardj | 2e93c50 | 2002-04-12 11:12:52 +0000 | [diff] [blame] | 678 | /* --------------------------------------------------------------------- |
| 679 | Handy utilities to block/restore all host signals. |
| 680 | ------------------------------------------------------------------ */ |
| 681 | |
| 682 | /* Block all host signals, dumping the old mask in *saved_mask. */ |
njn | 444eba1 | 2005-05-12 03:47:31 +0000 | [diff] [blame] | 683 | static void block_all_host_signals ( /* OUT */ vki_sigset_t* saved_mask ) |
sewardj | 2e93c50 | 2002-04-12 11:12:52 +0000 | [diff] [blame] | 684 | { |
| 685 | Int ret; |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 686 | vki_sigset_t block_procmask; |
| 687 | VG_(sigfillset)(&block_procmask); |
| 688 | ret = VG_(sigprocmask) |
sewardj | 2e93c50 | 2002-04-12 11:12:52 +0000 | [diff] [blame] | 689 | (VKI_SIG_SETMASK, &block_procmask, saved_mask); |
| 690 | vg_assert(ret == 0); |
| 691 | } |
| 692 | |
| 693 | /* Restore the blocking mask using the supplied saved one. */ |
njn | 444eba1 | 2005-05-12 03:47:31 +0000 | [diff] [blame] | 694 | static void restore_all_host_signals ( /* IN */ vki_sigset_t* saved_mask ) |
sewardj | 2e93c50 | 2002-04-12 11:12:52 +0000 | [diff] [blame] | 695 | { |
| 696 | Int ret; |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 697 | ret = VG_(sigprocmask)(VKI_SIG_SETMASK, saved_mask, NULL); |
sewardj | 2e93c50 | 2002-04-12 11:12:52 +0000 | [diff] [blame] | 698 | vg_assert(ret == 0); |
| 699 | } |
sewardj | de4a1d0 | 2002-03-22 01:27:54 +0000 | [diff] [blame] | 700 | |
njn | 444eba1 | 2005-05-12 03:47:31 +0000 | [diff] [blame] | 701 | void VG_(clear_out_queued_signals)( ThreadId tid, vki_sigset_t* saved_mask ) |
| 702 | { |
| 703 | block_all_host_signals(saved_mask); |
| 704 | if (VG_(threads)[tid].sig_queue != NULL) { |
| 705 | VG_(arena_free)(VG_AR_CORE, VG_(threads)[tid].sig_queue); |
| 706 | VG_(threads)[tid].sig_queue = NULL; |
| 707 | } |
| 708 | restore_all_host_signals(saved_mask); |
| 709 | } |
| 710 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 711 | Bool VG_(client_signal_OK)(Int sigNo) |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 712 | { |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 713 | /* signal 0 is OK for kill */ |
| 714 | Bool ret = sigNo >= 0 && sigNo <= VKI_SIGVGRTUSERMAX; |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 715 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 716 | //VG_(printf)("client_signal_OK(%d) -> %d\n", sigNo, ret); |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 717 | |
| 718 | return ret; |
| 719 | } |
| 720 | |
sewardj | de4a1d0 | 2002-03-22 01:27:54 +0000 | [diff] [blame] | 721 | /* --------------------------------------------------------------------- |
| 722 | The signal simulation proper. A simplified version of what the |
| 723 | Linux kernel does. |
| 724 | ------------------------------------------------------------------ */ |
| 725 | |
sewardj | de4a1d0 | 2002-03-22 01:27:54 +0000 | [diff] [blame] | 726 | /* Set up a stack frame (VgSigContext) for the client's signal |
nethercote | fedd810 | 2004-09-13 15:19:34 +0000 | [diff] [blame] | 727 | handler. */ |
sewardj | 2c5ffbe | 2005-03-12 13:32:06 +0000 | [diff] [blame] | 728 | static |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 729 | void push_signal_frame ( ThreadId tid, const vki_siginfo_t *siginfo ) |
sewardj | de4a1d0 | 2002-03-22 01:27:54 +0000 | [diff] [blame] | 730 | { |
nethercote | 6eec460 | 2004-09-13 14:15:36 +0000 | [diff] [blame] | 731 | Addr esp_top_of_frame; |
sewardj | 2e93c50 | 2002-04-12 11:12:52 +0000 | [diff] [blame] | 732 | ThreadState* tst; |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 733 | Int sigNo = siginfo->si_signo; |
sewardj | 2e93c50 | 2002-04-12 11:12:52 +0000 | [diff] [blame] | 734 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 735 | vg_assert(sigNo >= 1 && sigNo <= VG_(max_signal)); |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 736 | vg_assert(VG_(is_valid_tid)(tid)); |
| 737 | tst = & VG_(threads)[tid]; |
sewardj | 2e93c50 | 2002-04-12 11:12:52 +0000 | [diff] [blame] | 738 | |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 739 | if (VG_(clo_trace_signals)) |
| 740 | VG_(message)(Vg_DebugMsg, |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 741 | "push_signal_frame (thread %d): signal %d", tid, sigNo); |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 742 | |
sewardj | 2342c97 | 2002-05-22 23:34:20 +0000 | [diff] [blame] | 743 | if (/* this signal asked to run on an alt stack */ |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 744 | (scss.scss_per_sig[sigNo].scss_flags & VKI_SA_ONSTACK ) |
sewardj | 2342c97 | 2002-05-22 23:34:20 +0000 | [diff] [blame] | 745 | && /* there is a defined and enabled alt stack, which we're not |
| 746 | already using. Logic from get_sigframe in |
| 747 | arch/i386/kernel/signal.c. */ |
njn | cf45fd4 | 2004-11-24 16:30:22 +0000 | [diff] [blame] | 748 | sas_ss_flags(tid, STACK_PTR(tst->arch)) == 0 |
sewardj | 2342c97 | 2002-05-22 23:34:20 +0000 | [diff] [blame] | 749 | ) { |
| 750 | esp_top_of_frame |
fitzhardinge | 98c4dc0 | 2004-03-16 08:27:29 +0000 | [diff] [blame] | 751 | = (Addr)(tst->altstack.ss_sp) + tst->altstack.ss_size; |
sewardj | 2342c97 | 2002-05-22 23:34:20 +0000 | [diff] [blame] | 752 | if (VG_(clo_trace_signals)) |
| 753 | VG_(message)(Vg_DebugMsg, |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 754 | "delivering signal %d (%s) to thread %d: on ALT STACK (%p-%p; %d bytes)", |
| 755 | sigNo, signame(sigNo), tid, |
| 756 | tst->altstack.ss_sp, |
| 757 | tst->altstack.ss_sp + tst->altstack.ss_size, |
| 758 | tst->altstack.ss_size ); |
njn | fdc28af | 2003-02-24 10:36:48 +0000 | [diff] [blame] | 759 | |
nethercote | 7cc9c23 | 2004-01-21 15:08:04 +0000 | [diff] [blame] | 760 | /* Signal delivery to tools */ |
fitzhardinge | 98c4dc0 | 2004-03-16 08:27:29 +0000 | [diff] [blame] | 761 | VG_TRACK( pre_deliver_signal, tid, sigNo, /*alt_stack*/True ); |
njn | fdc28af | 2003-02-24 10:36:48 +0000 | [diff] [blame] | 762 | |
sewardj | 2342c97 | 2002-05-22 23:34:20 +0000 | [diff] [blame] | 763 | } else { |
njn | a60a7c1 | 2005-05-08 17:49:37 +0000 | [diff] [blame] | 764 | esp_top_of_frame = STACK_PTR(tst->arch) - VGA_STACK_REDZONE_SZB; |
njn | fdc28af | 2003-02-24 10:36:48 +0000 | [diff] [blame] | 765 | |
nethercote | 7cc9c23 | 2004-01-21 15:08:04 +0000 | [diff] [blame] | 766 | /* Signal delivery to tools */ |
fitzhardinge | 98c4dc0 | 2004-03-16 08:27:29 +0000 | [diff] [blame] | 767 | VG_TRACK( pre_deliver_signal, tid, sigNo, /*alt_stack*/False ); |
sewardj | 2342c97 | 2002-05-22 23:34:20 +0000 | [diff] [blame] | 768 | } |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 769 | |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 770 | vg_assert(scss.scss_per_sig[sigNo].scss_handler != VKI_SIG_IGN); |
| 771 | vg_assert(scss.scss_per_sig[sigNo].scss_handler != VKI_SIG_DFL); |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 772 | |
| 773 | /* This may fail if the client stack is busted; if that happens, |
| 774 | the whole process will exit rather than simply calling the |
| 775 | signal handler. */ |
sewardj | 985fabb | 2005-04-24 14:18:14 +0000 | [diff] [blame] | 776 | VG_(sigframe_create) (tid, esp_top_of_frame, siginfo, |
| 777 | scss.scss_per_sig[sigNo].scss_handler, |
| 778 | scss.scss_per_sig[sigNo].scss_flags, |
| 779 | &tst->sig_mask, |
| 780 | scss.scss_per_sig[sigNo].scss_restorer); |
sewardj | de4a1d0 | 2002-03-22 01:27:54 +0000 | [diff] [blame] | 781 | } |
| 782 | |
sewardj | de4a1d0 | 2002-03-22 01:27:54 +0000 | [diff] [blame] | 783 | |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 784 | static const Char *signame(Int sigNo) |
sewardj | de4a1d0 | 2002-03-22 01:27:54 +0000 | [diff] [blame] | 785 | { |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 786 | static Char buf[10]; |
sewardj | b48e500 | 2002-05-13 00:16:03 +0000 | [diff] [blame] | 787 | |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 788 | switch(sigNo) { |
| 789 | #define S(x) case VKI_##x: return #x |
| 790 | S(SIGHUP); |
| 791 | S(SIGINT); |
| 792 | S(SIGQUIT); |
| 793 | S(SIGILL); |
| 794 | S(SIGTRAP); |
| 795 | S(SIGABRT); |
| 796 | S(SIGBUS); |
| 797 | S(SIGFPE); |
| 798 | S(SIGKILL); |
| 799 | S(SIGUSR1); |
| 800 | S(SIGUSR2); |
| 801 | S(SIGSEGV); |
| 802 | S(SIGPIPE); |
| 803 | S(SIGALRM); |
| 804 | S(SIGTERM); |
| 805 | S(SIGSTKFLT); |
| 806 | S(SIGCHLD); |
| 807 | S(SIGCONT); |
| 808 | S(SIGSTOP); |
| 809 | S(SIGTSTP); |
| 810 | S(SIGTTIN); |
| 811 | S(SIGTTOU); |
| 812 | S(SIGURG); |
| 813 | S(SIGXCPU); |
| 814 | S(SIGXFSZ); |
| 815 | S(SIGVTALRM); |
| 816 | S(SIGPROF); |
| 817 | S(SIGWINCH); |
| 818 | S(SIGIO); |
| 819 | S(SIGPWR); |
| 820 | S(SIGUNUSED); |
| 821 | #undef S |
sewardj | de4a1d0 | 2002-03-22 01:27:54 +0000 | [diff] [blame] | 822 | |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 823 | case VKI_SIGRTMIN ... VKI_SIGRTMAX: |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 824 | VG_(sprintf)(buf, "SIGRT%d", sigNo-VKI_SIGRTMIN); |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 825 | return buf; |
sewardj | de4a1d0 | 2002-03-22 01:27:54 +0000 | [diff] [blame] | 826 | |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 827 | default: |
| 828 | VG_(sprintf)(buf, "SIG%d", sigNo); |
| 829 | return buf; |
| 830 | } |
| 831 | } |
sewardj | de4a1d0 | 2002-03-22 01:27:54 +0000 | [diff] [blame] | 832 | |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 833 | /* Hit ourselves with a signal using the default handler */ |
| 834 | void VG_(kill_self)(Int sigNo) |
| 835 | { |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 836 | vki_sigset_t mask, origmask; |
| 837 | struct vki_sigaction sa, origsa; |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 838 | |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 839 | sa.ksa_handler = VKI_SIG_DFL; |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 840 | sa.sa_flags = 0; |
| 841 | sa.sa_restorer = 0; |
| 842 | VG_(sigemptyset)(&sa.sa_mask); |
sewardj | 2e93c50 | 2002-04-12 11:12:52 +0000 | [diff] [blame] | 843 | |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 844 | VG_(sigaction)(sigNo, &sa, &origsa); |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 845 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 846 | VG_(sigemptyset)(&mask); |
| 847 | VG_(sigaddset)(&mask, sigNo); |
| 848 | VG_(sigprocmask)(VKI_SIG_UNBLOCK, &mask, &origmask); |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 849 | |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 850 | VG_(tkill)(VG_(getpid)(), sigNo); |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 851 | |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 852 | VG_(sigaction)(sigNo, &origsa, NULL); |
| 853 | VG_(sigprocmask)(VKI_SIG_SETMASK, &origmask, NULL); |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 854 | } |
| 855 | |
njn | 277a6d6 | 2004-11-26 14:07:24 +0000 | [diff] [blame] | 856 | // Core dumping is disabled until someone can work out how to abstract out |
| 857 | // the arch-specific and word-size-specific parts neatly. |
njn | bde3027 | 2004-11-29 15:45:31 +0000 | [diff] [blame] | 858 | // |
| 859 | // Note that the code below is not 64-bit clean! |
| 860 | // |
njn | 277a6d6 | 2004-11-26 14:07:24 +0000 | [diff] [blame] | 861 | #if 0 |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 862 | /* |
| 863 | Dump core |
| 864 | |
| 865 | Generate a standard ELF core file corresponding to the client state |
| 866 | at the time of a crash. |
| 867 | */ |
| 868 | #include <elf.h> |
| 869 | #ifndef NT_PRXFPREG |
| 870 | #define NT_PRXFPREG 0x46e62b7f /* copied from gdb5.1/include/elf/common.h */ |
| 871 | #endif /* NT_PRXFPREG */ |
| 872 | |
| 873 | /* If true, then this Segment may be mentioned in the core */ |
| 874 | static Bool may_dump(const Segment *seg) |
| 875 | { |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 876 | return (seg->flags & (SF_DEVICE|SF_VALGRIND)) == 0 && VG_(is_client_addr)(seg->addr); |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 877 | } |
| 878 | |
| 879 | /* If true, then this Segment's contents will be in the core */ |
| 880 | static Bool should_dump(const Segment *seg) |
| 881 | { |
| 882 | return may_dump(seg); // && (seg->prot & VKI_PROT_WRITE); |
| 883 | } |
| 884 | |
| 885 | static void fill_ehdr(Elf32_Ehdr *ehdr, Int num_phdrs) |
| 886 | { |
njn | e1d981a | 2005-03-11 04:47:23 +0000 | [diff] [blame] | 887 | VG_(memset)(ehdr, 0, sizeof(*ehdr)); |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 888 | |
| 889 | VG_(memcpy)(ehdr->e_ident, ELFMAG, SELFMAG); |
njn | 35172bc | 2005-03-26 00:04:03 +0000 | [diff] [blame] | 890 | ehdr->e_ident[EI_CLASS] = VGA_ELF_CLASS; |
| 891 | ehdr->e_ident[EI_DATA] = VGA_ELF_ENDIANNESS; |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 892 | ehdr->e_ident[EI_VERSION] = EV_CURRENT; |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 893 | |
| 894 | ehdr->e_type = ET_CORE; |
njn | 35172bc | 2005-03-26 00:04:03 +0000 | [diff] [blame] | 895 | ehdr->e_machine = VGA_ELF_MACHINE; |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 896 | ehdr->e_version = EV_CURRENT; |
| 897 | ehdr->e_entry = 0; |
| 898 | ehdr->e_phoff = sizeof(Elf32_Ehdr); |
| 899 | ehdr->e_shoff = 0; |
| 900 | ehdr->e_flags = 0; |
| 901 | ehdr->e_ehsize = sizeof(Elf32_Ehdr); |
| 902 | ehdr->e_phentsize = sizeof(Elf32_Phdr); |
| 903 | ehdr->e_phnum = num_phdrs; |
| 904 | ehdr->e_shentsize = 0; |
| 905 | ehdr->e_shnum = 0; |
| 906 | ehdr->e_shstrndx = 0; |
| 907 | |
| 908 | } |
| 909 | |
| 910 | static void fill_phdr(Elf32_Phdr *phdr, const Segment *seg, UInt off, Bool write) |
| 911 | { |
| 912 | write = write && should_dump(seg); |
| 913 | |
| 914 | VG_(memset)(phdr, 0, sizeof(*phdr)); |
| 915 | |
| 916 | phdr->p_type = PT_LOAD; |
| 917 | phdr->p_offset = off; |
| 918 | phdr->p_vaddr = seg->addr; |
| 919 | phdr->p_paddr = 0; |
| 920 | phdr->p_filesz = write ? seg->len : 0; |
| 921 | phdr->p_memsz = seg->len; |
| 922 | phdr->p_flags = 0; |
| 923 | |
| 924 | if (seg->prot & VKI_PROT_READ) |
| 925 | phdr->p_flags |= PF_R; |
| 926 | if (seg->prot & VKI_PROT_WRITE) |
| 927 | phdr->p_flags |= PF_W; |
| 928 | if (seg->prot & VKI_PROT_EXEC) |
| 929 | phdr->p_flags |= PF_X; |
| 930 | |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 931 | phdr->p_align = VKI_PAGE_SIZE; |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 932 | } |
| 933 | |
| 934 | struct note { |
| 935 | struct note *next; |
| 936 | Elf32_Nhdr note; |
| 937 | Char name[0]; |
| 938 | }; |
| 939 | |
| 940 | static UInt note_size(const struct note *n) |
| 941 | { |
| 942 | return sizeof(Elf32_Nhdr) + ROUNDUP(VG_(strlen)(n->name)+1, 4) + ROUNDUP(n->note.n_descsz, 4); |
| 943 | } |
| 944 | |
| 945 | static void add_note(struct note **list, const Char *name, UInt type, const void *data, UInt datasz) |
| 946 | { |
| 947 | Int namelen = VG_(strlen)(name)+1; |
| 948 | Int notelen = sizeof(struct note) + |
| 949 | ROUNDUP(namelen, 4) + |
| 950 | ROUNDUP(datasz, 4); |
| 951 | struct note *n = VG_(arena_malloc)(VG_AR_CORE, notelen); |
| 952 | |
| 953 | VG_(memset)(n, 0, notelen); |
| 954 | |
| 955 | n->next = *list; |
| 956 | *list = n; |
| 957 | |
| 958 | n->note.n_type = type; |
| 959 | n->note.n_namesz = namelen; |
| 960 | n->note.n_descsz = datasz; |
| 961 | |
| 962 | VG_(memcpy)(n->name, name, namelen); |
| 963 | VG_(memcpy)(n->name+ROUNDUP(namelen,4), data, datasz); |
| 964 | } |
| 965 | |
| 966 | static void write_note(Int fd, const struct note *n) |
| 967 | { |
| 968 | VG_(write)(fd, &n->note, note_size(n)); |
| 969 | } |
| 970 | |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 971 | static void fill_prpsinfo(const ThreadState *tst, struct vki_elf_prpsinfo *prpsinfo) |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 972 | { |
| 973 | Char *name; |
| 974 | |
| 975 | VG_(memset)(prpsinfo, 0, sizeof(*prpsinfo)); |
| 976 | |
| 977 | switch(tst->status) { |
| 978 | case VgTs_Runnable: |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 979 | case VgTs_Yielding: |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 980 | prpsinfo->pr_sname = 'R'; |
| 981 | break; |
| 982 | |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 983 | case VgTs_WaitSys: |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 984 | prpsinfo->pr_sname = 'S'; |
| 985 | break; |
| 986 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 987 | case VgTs_Zombie: |
| 988 | prpsinfo->pr_sname = 'Z'; |
| 989 | break; |
| 990 | |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 991 | case VgTs_Empty: |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 992 | case VgTs_Init: |
| 993 | prpsinfo->pr_sname = '?'; |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 994 | break; |
| 995 | } |
| 996 | |
| 997 | prpsinfo->pr_uid = 0; |
| 998 | prpsinfo->pr_gid = 0; |
| 999 | |
| 1000 | name = VG_(resolve_filename)(VG_(clexecfd)); |
| 1001 | |
| 1002 | if (name != NULL) { |
| 1003 | Char *n = name+VG_(strlen)(name)-1; |
| 1004 | |
| 1005 | while(n > name && *n != '/') |
| 1006 | n--; |
| 1007 | if (n != name) |
| 1008 | n++; |
| 1009 | |
| 1010 | VG_(strncpy)(prpsinfo->pr_fname, n, sizeof(prpsinfo->pr_fname)); |
| 1011 | } |
| 1012 | } |
| 1013 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1014 | static void fill_prstatus(const ThreadState *tst, |
| 1015 | struct vki_elf_prstatus *prs, |
| 1016 | const vki_siginfo_t *si) |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 1017 | { |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 1018 | struct vki_user_regs_struct *regs; |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 1019 | |
| 1020 | VG_(memset)(prs, 0, sizeof(*prs)); |
| 1021 | |
| 1022 | prs->pr_info.si_signo = si->si_signo; |
| 1023 | prs->pr_info.si_code = si->si_code; |
| 1024 | prs->pr_info.si_errno = 0; |
| 1025 | |
| 1026 | prs->pr_cursig = si->si_signo; |
| 1027 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1028 | prs->pr_pid = tst->os_state.lwpid; |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 1029 | prs->pr_ppid = 0; |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1030 | prs->pr_pgrp = VG_(getpgrp)(); |
| 1031 | prs->pr_sid = VG_(getpgrp)(); |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 1032 | |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 1033 | regs = (struct vki_user_regs_struct *)prs->pr_reg; |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 1034 | |
| 1035 | vg_assert(sizeof(*regs) == sizeof(prs->pr_reg)); |
| 1036 | |
sewardj | 2a99cf6 | 2004-11-24 10:44:19 +0000 | [diff] [blame] | 1037 | VGA_(fill_elfregs_from_tst)(regs, &tst->arch); |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 1038 | } |
| 1039 | |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 1040 | static void fill_fpu(const ThreadState *tst, vki_elf_fpregset_t *fpu) |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 1041 | { |
sewardj | 2a99cf6 | 2004-11-24 10:44:19 +0000 | [diff] [blame] | 1042 | VGA_(fill_elffpregs_from_tst)(fpu, &tst->arch); |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 1043 | } |
| 1044 | |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 1045 | static void fill_xfpu(const ThreadState *tst, vki_elf_fpxregset_t *xfpu) |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 1046 | { |
sewardj | 2a99cf6 | 2004-11-24 10:44:19 +0000 | [diff] [blame] | 1047 | VGA_(fill_elffpxregs_from_tst)(xfpu, &tst->arch); |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 1048 | } |
| 1049 | |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 1050 | static void make_coredump(ThreadId tid, const vki_siginfo_t *si, UInt max_size) |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 1051 | { |
| 1052 | Char buf[1000]; |
| 1053 | Char *basename = "vgcore"; |
| 1054 | Char *coreext = ""; |
| 1055 | Int seq = 0; |
| 1056 | Int core_fd; |
| 1057 | Segment *seg; |
| 1058 | Elf32_Ehdr ehdr; |
| 1059 | Elf32_Phdr *phdrs; |
| 1060 | Int num_phdrs; |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1061 | Int i, idx; |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 1062 | UInt off; |
| 1063 | struct note *notelist, *note; |
| 1064 | UInt notesz; |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 1065 | struct vki_elf_prpsinfo prpsinfo; |
| 1066 | struct vki_elf_prstatus prstatus; |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 1067 | |
nethercote | f854867 | 2004-06-21 12:42:35 +0000 | [diff] [blame] | 1068 | if (VG_(clo_log_name) != NULL) { |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 1069 | coreext = ".core"; |
nethercote | f854867 | 2004-06-21 12:42:35 +0000 | [diff] [blame] | 1070 | basename = VG_(clo_log_name); |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 1071 | } |
| 1072 | |
| 1073 | for(;;) { |
| 1074 | if (seq == 0) |
| 1075 | VG_(sprintf)(buf, "%s%s.pid%d", |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1076 | basename, coreext, VG_(getpid)()); |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 1077 | else |
| 1078 | VG_(sprintf)(buf, "%s%s.pid%d.%d", |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1079 | basename, coreext, VG_(getpid)(), seq); |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 1080 | seq++; |
| 1081 | |
| 1082 | core_fd = VG_(open)(buf, |
| 1083 | VKI_O_CREAT|VKI_O_WRONLY|VKI_O_EXCL|VKI_O_TRUNC, |
| 1084 | VKI_S_IRUSR|VKI_S_IWUSR); |
| 1085 | if (core_fd >= 0) |
| 1086 | break; |
| 1087 | |
| 1088 | if (core_fd != -VKI_EEXIST) |
| 1089 | return; /* can't create file */ |
| 1090 | } |
| 1091 | |
| 1092 | /* First, count how many memory segments to dump */ |
| 1093 | num_phdrs = 1; /* start with notes */ |
| 1094 | for(seg = VG_(first_segment)(); |
| 1095 | seg != NULL; |
| 1096 | seg = VG_(next_segment)(seg)) { |
| 1097 | if (!may_dump(seg)) |
| 1098 | continue; |
| 1099 | |
| 1100 | num_phdrs++; |
| 1101 | } |
| 1102 | |
| 1103 | fill_ehdr(&ehdr, num_phdrs); |
| 1104 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1105 | notelist = NULL; |
| 1106 | |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 1107 | /* Second, work out their layout */ |
| 1108 | phdrs = VG_(arena_malloc)(VG_AR_CORE, sizeof(*phdrs) * num_phdrs); |
| 1109 | |
| 1110 | for(i = 1; i < VG_N_THREADS; i++) { |
sewardj | 51ac087 | 2004-12-21 01:20:49 +0000 | [diff] [blame] | 1111 | vki_elf_fpregset_t fpu; |
| 1112 | vki_elf_fpxregset_t xfpu; |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 1113 | |
| 1114 | if (VG_(threads)[i].status == VgTs_Empty) |
| 1115 | continue; |
| 1116 | |
sewardj | 51ac087 | 2004-12-21 01:20:49 +0000 | [diff] [blame] | 1117 | fill_xfpu(&VG_(threads)[i], &xfpu); |
| 1118 | add_note(¬elist, "LINUX", NT_PRXFPREG, &xfpu, sizeof(xfpu)); |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 1119 | |
| 1120 | fill_fpu(&VG_(threads)[i], &fpu); |
| 1121 | add_note(¬elist, "CORE", NT_FPREGSET, &fpu, sizeof(fpu)); |
| 1122 | |
| 1123 | fill_prstatus(&VG_(threads)[i], &prstatus, si); |
| 1124 | add_note(¬elist, "CORE", NT_PRSTATUS, &prstatus, sizeof(prstatus)); |
| 1125 | } |
| 1126 | |
| 1127 | fill_prpsinfo(&VG_(threads)[tid], &prpsinfo); |
| 1128 | add_note(¬elist, "CORE", NT_PRPSINFO, &prpsinfo, sizeof(prpsinfo)); |
| 1129 | |
| 1130 | for(note = notelist, notesz = 0; note != NULL; note = note->next) |
| 1131 | notesz += note_size(note); |
| 1132 | |
| 1133 | off = sizeof(ehdr) + sizeof(*phdrs) * num_phdrs; |
| 1134 | |
| 1135 | phdrs[0].p_type = PT_NOTE; |
| 1136 | phdrs[0].p_offset = off; |
| 1137 | phdrs[0].p_vaddr = 0; |
| 1138 | phdrs[0].p_paddr = 0; |
| 1139 | phdrs[0].p_filesz = notesz; |
| 1140 | phdrs[0].p_memsz = 0; |
| 1141 | phdrs[0].p_flags = 0; |
| 1142 | phdrs[0].p_align = 0; |
| 1143 | |
| 1144 | off += notesz; |
| 1145 | |
| 1146 | off = PGROUNDUP(off); |
| 1147 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1148 | for(seg = VG_(first_segment)(), idx = 1; |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 1149 | seg != NULL; |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1150 | seg = VG_(next_segment)(seg)) { |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 1151 | if (!may_dump(seg)) |
| 1152 | continue; |
| 1153 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1154 | fill_phdr(&phdrs[idx], seg, off, (seg->len + off) < max_size); |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 1155 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1156 | off += phdrs[idx].p_filesz; |
| 1157 | |
| 1158 | idx++; |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 1159 | } |
| 1160 | |
| 1161 | /* write everything out */ |
| 1162 | VG_(write)(core_fd, &ehdr, sizeof(ehdr)); |
| 1163 | VG_(write)(core_fd, phdrs, sizeof(*phdrs) * num_phdrs); |
| 1164 | |
| 1165 | for(note = notelist; note != NULL; note = note->next) |
| 1166 | write_note(core_fd, note); |
| 1167 | |
| 1168 | VG_(lseek)(core_fd, phdrs[1].p_offset, VKI_SEEK_SET); |
| 1169 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1170 | for(seg = VG_(first_segment)(), idx = 1; |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 1171 | seg != NULL; |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1172 | seg = VG_(next_segment)(seg)) { |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 1173 | if (!should_dump(seg)) |
| 1174 | continue; |
| 1175 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1176 | if (phdrs[idx].p_filesz > 0) { |
| 1177 | Int ret; |
| 1178 | |
| 1179 | vg_assert(VG_(lseek)(core_fd, phdrs[idx].p_offset, VKI_SEEK_SET) == phdrs[idx].p_offset); |
| 1180 | vg_assert(seg->len >= phdrs[idx].p_filesz); |
| 1181 | |
| 1182 | ret = VG_(write)(core_fd, (void *)seg->addr, phdrs[idx].p_filesz); |
| 1183 | } |
| 1184 | idx++; |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 1185 | } |
| 1186 | |
| 1187 | VG_(close)(core_fd); |
| 1188 | } |
njn | 277a6d6 | 2004-11-26 14:07:24 +0000 | [diff] [blame] | 1189 | #endif |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 1190 | |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1191 | /* |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1192 | Perform the default action of a signal. If the signal is fatal, it |
| 1193 | marks all threads as needing to exit, but it doesn't actually kill |
| 1194 | the process or thread. |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1195 | |
| 1196 | If we're not being quiet, then print out some more detail about |
| 1197 | fatal signals (esp. core dumping signals). |
| 1198 | */ |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 1199 | static void default_action(const vki_siginfo_t *info, ThreadId tid) |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1200 | { |
| 1201 | Int sigNo = info->si_signo; |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1202 | Bool terminate = False; /* kills process */ |
| 1203 | Bool core = False; /* kills process w/ core */ |
| 1204 | struct vki_rlimit corelim; |
| 1205 | Bool could_core; |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1206 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1207 | vg_assert(VG_(is_running_thread)(tid)); |
| 1208 | |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1209 | switch(sigNo) { |
| 1210 | case VKI_SIGQUIT: /* core */ |
| 1211 | case VKI_SIGILL: /* core */ |
| 1212 | case VKI_SIGABRT: /* core */ |
| 1213 | case VKI_SIGFPE: /* core */ |
| 1214 | case VKI_SIGSEGV: /* core */ |
| 1215 | case VKI_SIGBUS: /* core */ |
| 1216 | case VKI_SIGTRAP: /* core */ |
| 1217 | case VKI_SIGXCPU: /* core */ |
| 1218 | case VKI_SIGXFSZ: /* core */ |
| 1219 | terminate = True; |
| 1220 | core = True; |
| 1221 | break; |
| 1222 | |
| 1223 | case VKI_SIGHUP: /* term */ |
| 1224 | case VKI_SIGINT: /* term */ |
| 1225 | case VKI_SIGKILL: /* term - we won't see this */ |
| 1226 | case VKI_SIGPIPE: /* term */ |
| 1227 | case VKI_SIGALRM: /* term */ |
| 1228 | case VKI_SIGTERM: /* term */ |
| 1229 | case VKI_SIGUSR1: /* term */ |
| 1230 | case VKI_SIGUSR2: /* term */ |
| 1231 | case VKI_SIGIO: /* term */ |
| 1232 | case VKI_SIGPWR: /* term */ |
| 1233 | case VKI_SIGSYS: /* term */ |
| 1234 | case VKI_SIGPROF: /* term */ |
| 1235 | case VKI_SIGVTALRM: /* term */ |
| 1236 | case VKI_SIGRTMIN ... VKI_SIGRTMAX: /* term */ |
| 1237 | terminate = True; |
| 1238 | break; |
| 1239 | } |
| 1240 | |
| 1241 | vg_assert(!core || (core && terminate)); |
| 1242 | |
fitzhardinge | 98abfc7 | 2003-12-16 02:05:15 +0000 | [diff] [blame] | 1243 | if (VG_(clo_trace_signals)) |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1244 | VG_(message)(Vg_DebugMsg, "delivering %d (code %d) to default handler; action: %s%s", |
| 1245 | sigNo, info->si_code, terminate ? "terminate" : "ignore", core ? "+core" : ""); |
fitzhardinge | 98abfc7 | 2003-12-16 02:05:15 +0000 | [diff] [blame] | 1246 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1247 | if (!terminate) |
| 1248 | return; /* nothing to do */ |
fitzhardinge | 4a4d108 | 2004-03-15 23:46:54 +0000 | [diff] [blame] | 1249 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1250 | could_core = core; |
| 1251 | |
| 1252 | if (core) { |
| 1253 | /* If they set the core-size limit to zero, don't generate a |
| 1254 | core file */ |
fitzhardinge | 61a5341 | 2004-03-15 23:44:11 +0000 | [diff] [blame] | 1255 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1256 | VG_(getrlimit)(VKI_RLIMIT_CORE, &corelim); |
fitzhardinge | 61a5341 | 2004-03-15 23:44:11 +0000 | [diff] [blame] | 1257 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1258 | if (corelim.rlim_cur == 0) |
| 1259 | core = False; |
| 1260 | } |
fitzhardinge | 61a5341 | 2004-03-15 23:44:11 +0000 | [diff] [blame] | 1261 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1262 | if (VG_(clo_verbosity) > 1 || (could_core && info->si_code > VKI_SI_USER)) { |
| 1263 | VG_(message)(Vg_UserMsg, ""); |
| 1264 | VG_(message)(Vg_UserMsg, "Process terminating with default action of signal %d (%s)%s", |
| 1265 | sigNo, signame(sigNo), core ? ": dumping core" : ""); |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1266 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1267 | /* Be helpful - decode some more details about this fault */ |
| 1268 | if (info->si_code > VKI_SI_USER) { |
| 1269 | const Char *event = NULL; |
| 1270 | Bool haveaddr = True; |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1271 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1272 | switch(sigNo) { |
| 1273 | case VKI_SIGSEGV: |
| 1274 | switch(info->si_code) { |
| 1275 | case 1: event = "Access not within mapped region"; break; |
| 1276 | case 2: event = "Bad permissions for mapped region"; break; |
| 1277 | case 128: |
| 1278 | /* General Protection Fault: The CPU/kernel |
| 1279 | isn't telling us anything useful, but this |
| 1280 | is commonly the result of exceeding a |
| 1281 | segment limit, such as the one imposed by |
| 1282 | --pointercheck=yes. */ |
| 1283 | if (VG_(clo_pointercheck)) |
| 1284 | event = "GPF (Pointer out of bounds?)"; |
| 1285 | else |
| 1286 | event = "General Protection Fault"; |
| 1287 | haveaddr = False; |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1288 | break; |
| 1289 | } |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1290 | break; |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1291 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1292 | case VKI_SIGILL: |
| 1293 | switch(info->si_code) { |
| 1294 | case 1: event = "Illegal opcode"; break; |
| 1295 | case 2: event = "Illegal operand"; break; |
| 1296 | case 3: event = "Illegal addressing mode"; break; |
| 1297 | case 4: event = "Illegal trap"; break; |
| 1298 | case 5: event = "Privileged opcode"; break; |
| 1299 | case 6: event = "Privileged register"; break; |
| 1300 | case 7: event = "Coprocessor error"; break; |
| 1301 | case 8: event = "Internal stack error"; break; |
| 1302 | } |
| 1303 | break; |
| 1304 | |
| 1305 | case VKI_SIGFPE: |
| 1306 | switch (info->si_code) { |
| 1307 | case 1: event = "Integer divide by zero"; break; |
| 1308 | case 2: event = "Integer overflow"; break; |
| 1309 | case 3: event = "FP divide by zero"; break; |
| 1310 | case 4: event = "FP overflow"; break; |
| 1311 | case 5: event = "FP underflow"; break; |
| 1312 | case 6: event = "FP inexact"; break; |
| 1313 | case 7: event = "FP invalid operation"; break; |
| 1314 | case 8: event = "FP subscript out of range"; break; |
| 1315 | } |
| 1316 | break; |
| 1317 | |
| 1318 | case VKI_SIGBUS: |
| 1319 | switch (info->si_code) { |
| 1320 | case 1: event = "Invalid address alignment"; break; |
| 1321 | case 2: event = "Non-existent physical address"; break; |
| 1322 | case 3: event = "Hardware error"; break; |
| 1323 | } |
| 1324 | break; |
| 1325 | } |
| 1326 | |
| 1327 | if (event != NULL) { |
| 1328 | if (haveaddr) |
nethercote | 3b390c7 | 2003-11-13 17:53:43 +0000 | [diff] [blame] | 1329 | VG_(message)(Vg_UserMsg, " %s at address %p", |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1330 | event, info->_sifields._sigfault._addr); |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1331 | else |
| 1332 | VG_(message)(Vg_UserMsg, " %s", event); |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1333 | } |
| 1334 | } |
fitzhardinge | 126c64f | 2003-12-08 21:58:37 +0000 | [diff] [blame] | 1335 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1336 | if (tid != VG_INVALID_THREADID) { |
njn | d01fef7 | 2005-03-25 23:35:48 +0000 | [diff] [blame] | 1337 | VG_(get_and_pp_StackTrace)(tid, VG_(clo_backtrace_size)); |
fitzhardinge | 126c64f | 2003-12-08 21:58:37 +0000 | [diff] [blame] | 1338 | } |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1339 | } |
| 1340 | |
| 1341 | if (VG_(is_action_requested)( "Attach to debugger", & VG_(clo_db_attach) )) { |
| 1342 | VG_(start_debugger)( tid ); |
| 1343 | } |
fitzhardinge | 126c64f | 2003-12-08 21:58:37 +0000 | [diff] [blame] | 1344 | |
njn | 277a6d6 | 2004-11-26 14:07:24 +0000 | [diff] [blame] | 1345 | // See comment above about this temporary disabling of core dumps. |
| 1346 | #if 0 |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1347 | if (core) { |
| 1348 | const static struct vki_rlimit zero = { 0, 0 }; |
fitzhardinge | 4a4d108 | 2004-03-15 23:46:54 +0000 | [diff] [blame] | 1349 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1350 | make_coredump(tid, info, corelim.rlim_cur); |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 1351 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1352 | /* Make sure we don't get a confusing kernel-generated |
| 1353 | coredump when we finally exit */ |
| 1354 | VG_(setrlimit)(VKI_RLIMIT_CORE, &zero); |
| 1355 | } |
njn | 277a6d6 | 2004-11-26 14:07:24 +0000 | [diff] [blame] | 1356 | #endif |
fitzhardinge | d65dcad | 2004-03-13 02:06:58 +0000 | [diff] [blame] | 1357 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1358 | /* stash fatal signal in main thread */ |
sewardj | 1d88711 | 2005-05-30 21:44:08 +0000 | [diff] [blame^] | 1359 | // what's this for? |
| 1360 | //VG_(threads)[VG_(master_tid)].os_state.fatalsig = sigNo; |
sewardj | de4a1d0 | 2002-03-22 01:27:54 +0000 | [diff] [blame] | 1361 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1362 | /* everyone dies */ |
| 1363 | VG_(nuke_all_threads_except)(tid, VgSrc_FatalSig); |
| 1364 | VG_(threads)[tid].exitreason = VgSrc_FatalSig; |
| 1365 | VG_(threads)[tid].os_state.fatalsig = sigNo; |
sewardj | b48e500 | 2002-05-13 00:16:03 +0000 | [diff] [blame] | 1366 | } |
| 1367 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1368 | /* |
| 1369 | This does the business of delivering a signal to a thread. It may |
| 1370 | be called from either a real signal handler, or from normal code to |
| 1371 | cause the thread to enter the signal handler. |
sewardj | 5e2f001 | 2004-12-13 14:10:34 +0000 | [diff] [blame] | 1372 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1373 | This updates the thread state, but it does not set it to be |
| 1374 | Runnable. |
| 1375 | */ |
njn | 9ec0f3e | 2005-03-13 06:00:47 +0000 | [diff] [blame] | 1376 | static void deliver_signal ( ThreadId tid, const vki_siginfo_t *info ) |
sewardj | de4a1d0 | 2002-03-22 01:27:54 +0000 | [diff] [blame] | 1377 | { |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1378 | Int sigNo = info->si_signo; |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 1379 | SCSS_Per_Signal *handler = &scss.scss_per_sig[sigNo]; |
fitzhardinge | 98abfc7 | 2003-12-16 02:05:15 +0000 | [diff] [blame] | 1380 | void *handler_fn; |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1381 | ThreadState *tst = VG_(get_ThreadState)(tid); |
| 1382 | |
| 1383 | if (VG_(clo_trace_signals)) |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1384 | VG_(message)(Vg_DebugMsg,"delivering signal %d (%s):%d to thread %d", |
| 1385 | sigNo, signame(sigNo), info->si_code, tid ); |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1386 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1387 | if (sigNo == VKI_SIGVGKILL) { |
| 1388 | /* If this is a SIGVGKILL, we're expecting it to interrupt any |
| 1389 | blocked syscall. It doesn't matter whether the VCPU state is |
| 1390 | set to restart or not, because we don't expect it will |
| 1391 | execute any more client instructions. */ |
| 1392 | vg_assert(VG_(is_exiting)(tid)); |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1393 | return; |
| 1394 | } |
| 1395 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1396 | /* If the client specifies SIG_IGN, treat it as SIG_DFL. |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1397 | |
njn | 9ec0f3e | 2005-03-13 06:00:47 +0000 | [diff] [blame] | 1398 | If deliver_signal() is being called on a thread, we want |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1399 | the signal to get through no matter what; if they're ignoring |
| 1400 | it, then we do this override (this is so we can send it SIGSEGV, |
| 1401 | etc). */ |
fitzhardinge | 98abfc7 | 2003-12-16 02:05:15 +0000 | [diff] [blame] | 1402 | handler_fn = handler->scss_handler; |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1403 | if (handler_fn == VKI_SIG_IGN) |
fitzhardinge | 98abfc7 | 2003-12-16 02:05:15 +0000 | [diff] [blame] | 1404 | handler_fn = VKI_SIG_DFL; |
| 1405 | |
| 1406 | vg_assert(handler_fn != VKI_SIG_IGN); |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1407 | |
fitzhardinge | 98abfc7 | 2003-12-16 02:05:15 +0000 | [diff] [blame] | 1408 | if (handler_fn == VKI_SIG_DFL) { |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 1409 | default_action(info, tid); |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1410 | } else { |
| 1411 | /* Create a signal delivery frame, and set the client's %ESP and |
| 1412 | %EIP so that when execution continues, we will enter the |
| 1413 | signal handler with the frame on top of the client's stack, |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1414 | as it expects. |
| 1415 | |
| 1416 | Signal delivery can fail if the client stack is too small or |
| 1417 | missing, and we can't push the frame. If that happens, |
| 1418 | push_signal_frame will cause the whole process to exit when |
| 1419 | we next hit the scheduler. |
| 1420 | */ |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1421 | vg_assert(VG_(is_valid_tid)(tid)); |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1422 | |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 1423 | push_signal_frame ( tid, info ); |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1424 | |
| 1425 | if (handler->scss_flags & VKI_SA_ONESHOT) { |
| 1426 | /* Do the ONESHOT thing. */ |
| 1427 | handler->scss_handler = VKI_SIG_DFL; |
| 1428 | |
nethercote | 9dd1151 | 2004-08-04 15:31:30 +0000 | [diff] [blame] | 1429 | handle_SCSS_change( False /* lazy update */ ); |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1430 | } |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1431 | |
| 1432 | /* At this point: |
| 1433 | tst->sig_mask is the current signal mask |
| 1434 | tst->tmp_sig_mask is the same as sig_mask, unless we're in sigsuspend |
| 1435 | handler->scss_mask is the mask set by the handler |
| 1436 | |
| 1437 | Handler gets a mask of tmp_sig_mask|handler_mask|signo |
| 1438 | */ |
| 1439 | tst->sig_mask = tst->tmp_sig_mask; |
| 1440 | if (!(handler->scss_flags & VKI_SA_NOMASK)) { |
| 1441 | VG_(sigaddset_from_set)(&tst->sig_mask, &handler->scss_mask); |
| 1442 | VG_(sigaddset)(&tst->sig_mask, sigNo); |
| 1443 | |
| 1444 | tst->tmp_sig_mask = tst->sig_mask; |
| 1445 | } |
| 1446 | } |
| 1447 | |
| 1448 | /* Thread state is ready to go - just add Runnable */ |
| 1449 | } |
| 1450 | |
njn | 9ec0f3e | 2005-03-13 06:00:47 +0000 | [diff] [blame] | 1451 | static void synth_fault_common(ThreadId tid, Addr addr, Int si_code) |
| 1452 | { |
| 1453 | vki_siginfo_t info; |
| 1454 | |
| 1455 | vg_assert(VG_(threads)[tid].status == VgTs_Runnable); |
| 1456 | |
| 1457 | info.si_signo = VKI_SIGSEGV; |
| 1458 | info.si_code = si_code; |
| 1459 | info._sifields._sigfault._addr = (void*)addr; |
| 1460 | |
| 1461 | /* If they're trying to block the signal, force it to be delivered */ |
| 1462 | if (VG_(sigismember)(&VG_(threads)[tid].sig_mask, VKI_SIGSEGV)) |
| 1463 | VG_(set_default_handler)(VKI_SIGSEGV); |
| 1464 | |
| 1465 | deliver_signal(tid, &info); |
| 1466 | } |
| 1467 | |
| 1468 | // Synthesize a fault where the address is OK, but the page |
| 1469 | // permissions are bad. |
| 1470 | void VG_(synth_fault_perms)(ThreadId tid, Addr addr) |
| 1471 | { |
| 1472 | synth_fault_common(tid, addr, 2); |
| 1473 | } |
| 1474 | |
| 1475 | // Synthesize a fault where the address there's nothing mapped at the address. |
| 1476 | void VG_(synth_fault_mapping)(ThreadId tid, Addr addr) |
| 1477 | { |
| 1478 | synth_fault_common(tid, addr, 1); |
| 1479 | } |
| 1480 | |
| 1481 | // Synthesize a misc memory fault. |
| 1482 | void VG_(synth_fault)(ThreadId tid) |
| 1483 | { |
| 1484 | synth_fault_common(tid, 0, 0x80); |
| 1485 | } |
| 1486 | |
| 1487 | // Synthesise a SIGILL. |
| 1488 | void VG_(synth_sigill)(ThreadId tid, Addr addr) |
| 1489 | { |
| 1490 | vki_siginfo_t info; |
| 1491 | |
| 1492 | vg_assert(VG_(threads)[tid].status == VgTs_Runnable); |
| 1493 | |
| 1494 | info.si_signo = VKI_SIGILL; |
| 1495 | info.si_code = 1; /* jrs: no idea what this should be */ |
| 1496 | info._sifields._sigfault._addr = (void*)addr; |
| 1497 | |
| 1498 | VG_(resume_scheduler)(tid); |
| 1499 | deliver_signal(tid, &info); |
| 1500 | } |
| 1501 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1502 | /* Make a signal pending for a thread, for later delivery. |
| 1503 | VG_(poll_signals) will arrange for it to be delivered at the right |
| 1504 | time. |
| 1505 | |
| 1506 | tid==0 means add it to the process-wide queue, and not sent it to a |
| 1507 | specific thread. |
| 1508 | */ |
sewardj | 2c5ffbe | 2005-03-12 13:32:06 +0000 | [diff] [blame] | 1509 | static |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1510 | void queue_signal(ThreadId tid, const vki_siginfo_t *si) |
| 1511 | { |
| 1512 | ThreadState *tst; |
| 1513 | SigQueue *sq; |
| 1514 | vki_sigset_t savedmask; |
| 1515 | |
| 1516 | tst = VG_(get_ThreadState)(tid); |
| 1517 | |
| 1518 | /* Protect the signal queue against async deliveries */ |
njn | 444eba1 | 2005-05-12 03:47:31 +0000 | [diff] [blame] | 1519 | block_all_host_signals(&savedmask); |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1520 | |
| 1521 | if (tst->sig_queue == NULL) { |
| 1522 | tst->sig_queue = VG_(arena_malloc)(VG_AR_CORE, sizeof(*tst->sig_queue)); |
| 1523 | VG_(memset)(tst->sig_queue, 0, sizeof(*tst->sig_queue)); |
| 1524 | } |
| 1525 | sq = tst->sig_queue; |
| 1526 | |
| 1527 | if (VG_(clo_trace_signals)) |
| 1528 | VG_(message)(Vg_DebugMsg, "Queueing signal %d (idx %d) to thread %d", |
| 1529 | si->si_signo, sq->next, tid); |
| 1530 | |
| 1531 | /* Add signal to the queue. If the queue gets overrun, then old |
| 1532 | queued signals may get lost. |
| 1533 | |
| 1534 | XXX We should also keep a sigset of pending signals, so that at |
| 1535 | least a non-siginfo signal gets deliviered. |
| 1536 | */ |
| 1537 | if (sq->sigs[sq->next].si_signo != 0) |
| 1538 | VG_(message)(Vg_UserMsg, "Signal %d being dropped from thread %d's queue", |
| 1539 | sq->sigs[sq->next].si_signo, tid); |
| 1540 | |
| 1541 | sq->sigs[sq->next] = *si; |
| 1542 | sq->next = (sq->next+1) % N_QUEUED_SIGNALS; |
| 1543 | |
njn | 444eba1 | 2005-05-12 03:47:31 +0000 | [diff] [blame] | 1544 | restore_all_host_signals(&savedmask); |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1545 | } |
| 1546 | |
| 1547 | /* |
| 1548 | Returns the next queued signal for thread tid which is in "set". |
| 1549 | tid==0 means process-wide signal. Set si_signo to 0 when the |
| 1550 | signal has been delivered. |
| 1551 | |
| 1552 | Must be called with all signals blocked, to protect against async |
| 1553 | deliveries. |
| 1554 | */ |
| 1555 | static vki_siginfo_t *next_queued(ThreadId tid, const vki_sigset_t *set) |
| 1556 | { |
| 1557 | ThreadState *tst = VG_(get_ThreadState)(tid); |
| 1558 | SigQueue *sq; |
| 1559 | Int idx; |
| 1560 | vki_siginfo_t *ret = NULL; |
| 1561 | |
| 1562 | sq = tst->sig_queue; |
| 1563 | if (sq == NULL) |
| 1564 | goto out; |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1565 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1566 | idx = sq->next; |
| 1567 | do { |
| 1568 | if (0) |
| 1569 | VG_(printf)("idx=%d si_signo=%d inset=%d\n", idx, |
| 1570 | sq->sigs[idx].si_signo, VG_(sigismember)(set, sq->sigs[idx].si_signo)); |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1571 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1572 | if (sq->sigs[idx].si_signo != 0 && VG_(sigismember)(set, sq->sigs[idx].si_signo)) { |
| 1573 | if (VG_(clo_trace_signals)) |
| 1574 | VG_(message)(Vg_DebugMsg, "Returning queued signal %d (idx %d) for thread %d", |
| 1575 | sq->sigs[idx].si_signo, idx, tid); |
| 1576 | ret = &sq->sigs[idx]; |
| 1577 | goto out; |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1578 | } |
| 1579 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1580 | idx = (idx + 1) % N_QUEUED_SIGNALS; |
| 1581 | } while(idx != sq->next); |
| 1582 | out: |
| 1583 | return ret; |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1584 | } |
| 1585 | |
| 1586 | /* |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1587 | Receive an async signal from the kernel. |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1588 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1589 | This should only happen when the thread is blocked in a syscall, |
| 1590 | since that's the only time this set of signals is unblocked. |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1591 | */ |
| 1592 | static |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 1593 | void async_signalhandler ( Int sigNo, vki_siginfo_t *info, struct vki_ucontext *uc ) |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1594 | { |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1595 | ThreadId tid = VG_(get_lwp_tid)(VG_(gettid)()); |
| 1596 | ThreadState *tst = VG_(get_ThreadState)(tid); |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1597 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1598 | vg_assert(tst->status == VgTs_WaitSys); |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1599 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1600 | /* The thread isn't currently running, make it so before going on */ |
| 1601 | VG_(set_running)(tid); |
| 1602 | |
| 1603 | if (VG_(clo_trace_signals)) |
| 1604 | VG_(message)(Vg_DebugMsg, "Async handler got signal %d for tid %d info %d", |
| 1605 | sigNo, tid, info->si_code); |
| 1606 | |
| 1607 | /* Update thread state properly */ |
njn | 605f488 | 2005-05-29 17:50:40 +0000 | [diff] [blame] | 1608 | VGP_(interrupted_syscall)(tid, |
| 1609 | VGP_UCONTEXT_INSTR_PTR(uc), |
| 1610 | VGP_UCONTEXT_SYSCALL_NUM(uc), |
| 1611 | VGP_UCONTEXT_SYSCALL_RET(uc), |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 1612 | !!(scss.scss_per_sig[sigNo].scss_flags & VKI_SA_RESTART)); |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1613 | |
| 1614 | /* Set up the thread's state to deliver a signal */ |
njn | 07ef6c0 | 2005-05-18 19:43:09 +0000 | [diff] [blame] | 1615 | if (!is_sig_ign(info->si_signo)) |
njn | 9ec0f3e | 2005-03-13 06:00:47 +0000 | [diff] [blame] | 1616 | deliver_signal(tid, info); |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1617 | |
| 1618 | /* longjmp back to the thread's main loop to start executing the |
| 1619 | handler. */ |
| 1620 | VG_(resume_scheduler)(tid); |
| 1621 | |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 1622 | VG_(core_panic)("async_signalhandler: got unexpected signal while outside of scheduler"); |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1623 | } |
| 1624 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1625 | /* Extend the stack to cover addr. maxsize is the limit the stack can grow to. |
| 1626 | |
| 1627 | Returns True on success, False on failure. |
| 1628 | |
| 1629 | Succeeds without doing anything if addr is already within a segment. |
| 1630 | |
| 1631 | Failure could be caused by: |
| 1632 | - addr not below a growable segment |
| 1633 | - new stack size would exceed maxsize |
| 1634 | - mmap failed for some other reason |
| 1635 | */ |
| 1636 | Bool VG_(extend_stack)(Addr addr, UInt maxsize) |
| 1637 | { |
| 1638 | Segment *seg; |
| 1639 | Addr base; |
| 1640 | UInt newsize; |
| 1641 | |
| 1642 | /* Find the next Segment above addr */ |
| 1643 | seg = VG_(find_segment)(addr); |
| 1644 | if (seg) |
| 1645 | return True; |
| 1646 | |
| 1647 | /* now we know addr is definitely unmapped */ |
| 1648 | seg = VG_(find_segment_above_unmapped)(addr); |
| 1649 | |
| 1650 | /* If there isn't one, or it isn't growable, fail */ |
| 1651 | if (seg == NULL || |
| 1652 | !(seg->flags & SF_GROWDOWN) || |
| 1653 | VG_(seg_contains)(seg, addr, sizeof(void *))) |
| 1654 | return False; |
| 1655 | |
| 1656 | vg_assert(seg->addr > addr); |
| 1657 | |
| 1658 | /* Create the mapping */ |
| 1659 | base = PGROUNDDN(addr); |
| 1660 | newsize = seg->addr - base; |
| 1661 | |
| 1662 | if (seg->len + newsize >= maxsize) |
| 1663 | return False; |
| 1664 | |
| 1665 | if (VG_(mmap)((Char *)base, newsize, |
| 1666 | seg->prot, |
| 1667 | VKI_MAP_PRIVATE | VKI_MAP_FIXED | VKI_MAP_ANONYMOUS | VKI_MAP_CLIENT, |
| 1668 | seg->flags, |
| 1669 | -1, 0) == (void *)-1) |
| 1670 | return False; |
| 1671 | |
| 1672 | if (0) |
| 1673 | VG_(printf)("extended stack: %p %d\n", |
| 1674 | base, newsize); |
| 1675 | |
| 1676 | if (VG_(clo_sanity_level) > 2) |
| 1677 | VG_(sanity_check_general)(False); |
| 1678 | |
| 1679 | return True; |
| 1680 | } |
| 1681 | |
| 1682 | static void (*fault_catcher)(Int sig, Addr addr); |
| 1683 | |
| 1684 | void VG_(set_fault_catcher)(void (*catcher)(Int, Addr)) |
| 1685 | { |
njn | 50ae1a7 | 2005-04-08 23:28:23 +0000 | [diff] [blame] | 1686 | vg_assert2(NULL == catcher || NULL == fault_catcher, |
| 1687 | "Fault catcher is already registered"); |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1688 | |
| 1689 | fault_catcher = catcher; |
| 1690 | } |
| 1691 | |
| 1692 | |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1693 | /* |
sewardj | 2a99cf6 | 2004-11-24 10:44:19 +0000 | [diff] [blame] | 1694 | Receive a sync signal from the host. |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1695 | */ |
| 1696 | static |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 1697 | void sync_signalhandler ( Int sigNo, vki_siginfo_t *info, struct vki_ucontext *uc ) |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1698 | { |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1699 | ThreadId tid = VG_(get_lwp_tid)(VG_(gettid)()); |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1700 | |
| 1701 | vg_assert(info != NULL); |
| 1702 | vg_assert(info->si_signo == sigNo); |
| 1703 | vg_assert(sigNo == VKI_SIGSEGV || |
| 1704 | sigNo == VKI_SIGBUS || |
| 1705 | sigNo == VKI_SIGFPE || |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1706 | sigNo == VKI_SIGILL || |
| 1707 | sigNo == VKI_SIGTRAP); |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1708 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1709 | if (info->si_code <= VKI_SI_USER) { |
| 1710 | /* If some user-process sent us one of these signals (ie, |
| 1711 | they're not the result of a faulting instruction), then treat |
| 1712 | it as an async signal. This is tricky because we could get |
| 1713 | this almost anywhere: |
| 1714 | - while generated client code |
| 1715 | Action: queue signal and return |
| 1716 | - while running Valgrind code |
| 1717 | Action: queue signal and return |
| 1718 | - while blocked in a syscall |
| 1719 | Action: make thread runnable, queue signal, resume scheduler |
| 1720 | */ |
| 1721 | if (VG_(threads)[tid].status == VgTs_WaitSys) { |
| 1722 | /* Since this signal interrupted a syscall, it means the |
| 1723 | client's signal mask was applied, so we can't get here |
| 1724 | unless the client wants this signal right now. This means |
| 1725 | we can simply use the async_signalhandler. */ |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 1726 | async_signalhandler(sigNo, info, uc); |
| 1727 | VG_(core_panic)("async_signalhandler returned!?\n"); |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1728 | } |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1729 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1730 | if (info->_sifields._kill._pid == 0) { |
| 1731 | /* There's a per-user limit of pending siginfo signals. If |
| 1732 | you exceed this, by having more than that number of |
| 1733 | pending signals with siginfo, then new signals are |
| 1734 | delivered without siginfo. This condition can be caused |
| 1735 | by any unrelated program you're running at the same time |
| 1736 | as Valgrind, if it has a large number of pending siginfo |
| 1737 | signals which it isn't taking delivery of. |
| 1738 | |
| 1739 | Since we depend on siginfo to work out why we were sent a |
| 1740 | signal and what we should do about it, we really can't |
| 1741 | continue unless we get it. */ |
| 1742 | VG_(message)(Vg_UserMsg, "Signal %d (%s) appears to have lost its siginfo; I can't go on.", |
| 1743 | sigNo, signame(sigNo)); |
| 1744 | VG_(message)(Vg_UserMsg, " This may be because one of your programs has consumed your"); |
| 1745 | VG_(message)(Vg_UserMsg, " ration of siginfo structures."); |
| 1746 | |
| 1747 | /* It's a fatal signal, so we force the default handler. */ |
| 1748 | VG_(set_default_handler)(sigNo); |
njn | 9ec0f3e | 2005-03-13 06:00:47 +0000 | [diff] [blame] | 1749 | deliver_signal(tid, info); |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1750 | VG_(resume_scheduler)(tid); |
| 1751 | VG_(exit)(99); /* If we can't resume, then just exit */ |
| 1752 | } |
| 1753 | |
| 1754 | if (VG_(clo_trace_signals)) |
| 1755 | VG_(message)(Vg_DebugMsg, "Routing user-sent sync signal %d via queue", |
| 1756 | sigNo); |
| 1757 | |
| 1758 | /* Since every thread has these signals unblocked, we can't rely |
| 1759 | on the kernel to route them properly, so we need to queue |
| 1760 | them manually. */ |
| 1761 | if (info->si_code == VKI_SI_TKILL) |
| 1762 | queue_signal(tid, info); /* directed to us specifically */ |
| 1763 | else |
| 1764 | queue_signal(0, info); /* shared pending */ |
| 1765 | |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1766 | return; |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1767 | } |
| 1768 | |
| 1769 | if (VG_(clo_trace_signals)) { |
| 1770 | VG_(message)(Vg_DebugMsg, "signal %d arrived ... si_code=%d, EIP=%p, eip=%p", |
| 1771 | sigNo, info->si_code, |
| 1772 | INSTR_PTR(VG_(threads)[tid].arch), |
njn | f6d228b | 2005-03-26 02:42:31 +0000 | [diff] [blame] | 1773 | VGP_UCONTEXT_INSTR_PTR(uc) ); |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1774 | } |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1775 | vg_assert(sigNo >= 1 && sigNo <= VG_(max_signal)); |
sewardj | de4a1d0 | 2002-03-22 01:27:54 +0000 | [diff] [blame] | 1776 | |
fitzhardinge | 98abfc7 | 2003-12-16 02:05:15 +0000 | [diff] [blame] | 1777 | /* Special fault-handling case. We can now get signals which can |
| 1778 | act upon and immediately restart the faulting instruction. |
| 1779 | */ |
| 1780 | if (info->si_signo == VKI_SIGSEGV) { |
fitzhardinge | 98abfc7 | 2003-12-16 02:05:15 +0000 | [diff] [blame] | 1781 | Addr fault = (Addr)info->_sifields._sigfault._addr; |
njn | cf45fd4 | 2004-11-24 16:30:22 +0000 | [diff] [blame] | 1782 | Addr esp = STACK_PTR(VG_(threads)[tid].arch); |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1783 | Segment* seg; |
fitzhardinge | 98abfc7 | 2003-12-16 02:05:15 +0000 | [diff] [blame] | 1784 | |
| 1785 | seg = VG_(find_segment)(fault); |
sewardj | 548be6d | 2005-02-16 01:31:37 +0000 | [diff] [blame] | 1786 | if (seg == NULL) |
| 1787 | seg = VG_(find_segment_above_unmapped)(fault); |
| 1788 | |
fitzhardinge | 98abfc7 | 2003-12-16 02:05:15 +0000 | [diff] [blame] | 1789 | if (VG_(clo_trace_signals)) { |
| 1790 | if (seg == NULL) |
| 1791 | VG_(message)(Vg_DebugMsg, |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1792 | "SIGSEGV: si_code=%d faultaddr=%p tid=%d ESP=%p seg=NULL shad=%p-%p", |
fitzhardinge | 98abfc7 | 2003-12-16 02:05:15 +0000 | [diff] [blame] | 1793 | info->si_code, fault, tid, esp, |
| 1794 | VG_(shadow_base), VG_(shadow_end)); |
| 1795 | else |
| 1796 | VG_(message)(Vg_DebugMsg, |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1797 | "SIGSEGV: si_code=%d faultaddr=%p tid=%d ESP=%p seg=%p-%p fl=%x shad=%p-%p", |
fitzhardinge | 98abfc7 | 2003-12-16 02:05:15 +0000 | [diff] [blame] | 1798 | info->si_code, fault, tid, esp, seg->addr, seg->addr+seg->len, seg->flags, |
| 1799 | VG_(shadow_base), VG_(shadow_end)); |
| 1800 | } |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1801 | if (info->si_code == 1 /* SEGV_MAPERR */ |
njn | a60a7c1 | 2005-05-08 17:49:37 +0000 | [diff] [blame] | 1802 | && fault >= (esp - VGA_STACK_REDZONE_SZB) |
njn | cafca7b | 2005-03-13 04:39:28 +0000 | [diff] [blame] | 1803 | && fault < VG_(client_end)) { |
fitzhardinge | 98abfc7 | 2003-12-16 02:05:15 +0000 | [diff] [blame] | 1804 | /* If the fault address is above esp but below the current known |
| 1805 | stack segment base, and it was a fault because there was |
| 1806 | nothing mapped there (as opposed to a permissions fault), |
| 1807 | then extend the stack segment. |
| 1808 | */ |
njn | a60a7c1 | 2005-05-08 17:49:37 +0000 | [diff] [blame] | 1809 | Addr base = PGROUNDDN(esp - VGA_STACK_REDZONE_SZB); |
njn | 50ba34e | 2005-04-04 02:41:42 +0000 | [diff] [blame] | 1810 | if (VG_(extend_stack)(base, VG_(threads)[tid].client_stack_szB)) { |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1811 | if (VG_(clo_trace_signals)) |
| 1812 | VG_(message)(Vg_DebugMsg, |
| 1813 | " -> extended stack base to %p", PGROUNDDN(fault)); |
| 1814 | return; // extension succeeded, restart instruction |
| 1815 | } else |
| 1816 | VG_(message)(Vg_UserMsg, "Stack overflow in thread %d: can't grow stack to %p", |
| 1817 | tid, fault); |
| 1818 | |
| 1819 | /* Fall into normal signal handling for all other cases */ |
fitzhardinge | 98abfc7 | 2003-12-16 02:05:15 +0000 | [diff] [blame] | 1820 | } else if (info->si_code == 2 && /* SEGV_ACCERR */ |
| 1821 | VG_(needs).shadow_memory && |
| 1822 | VG_(is_shadow_addr)(fault)) { |
| 1823 | /* If there's a fault within the shadow memory range, and it |
| 1824 | is a permissions fault, then it means that the client is |
| 1825 | using some memory which had not previously been used. |
| 1826 | This catches those faults, makes the memory accessible, |
nethercote | 7cc9c23 | 2004-01-21 15:08:04 +0000 | [diff] [blame] | 1827 | and calls the tool to initialize that page. |
fitzhardinge | 98abfc7 | 2003-12-16 02:05:15 +0000 | [diff] [blame] | 1828 | */ |
| 1829 | static Int recursion = 0; |
| 1830 | |
| 1831 | if (recursion++ == 0) { |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 1832 | VG_(init_shadow_range)(PGROUNDDN(fault), VKI_PAGE_SIZE, True); |
fitzhardinge | 98abfc7 | 2003-12-16 02:05:15 +0000 | [diff] [blame] | 1833 | recursion--; |
| 1834 | return; |
| 1835 | } else { |
| 1836 | /* otherwise fall into normal SEGV handling */ |
| 1837 | recursion--; |
| 1838 | } |
| 1839 | } |
| 1840 | } |
| 1841 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1842 | /* OK, this is a signal we really have to deal with. If it came |
| 1843 | from the client's code, then we can jump back into the scheduler |
| 1844 | and have it delivered. Otherwise it's a Valgrind bug. */ |
| 1845 | { |
njn | d01fef7 | 2005-03-25 23:35:48 +0000 | [diff] [blame] | 1846 | Addr ips[ VG_(clo_backtrace_size) ]; |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1847 | ThreadState *tst = VG_(get_ThreadState)(VG_(get_lwp_tid)(VG_(gettid)())); |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1848 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1849 | if (VG_(sigismember)(&tst->sig_mask, sigNo)) { |
| 1850 | /* signal is blocked, but they're not allowed to block faults */ |
| 1851 | VG_(set_default_handler)(sigNo); |
| 1852 | } |
| 1853 | |
| 1854 | if (!VG_(my_fault)) { |
| 1855 | /* Can't continue; must longjmp back to the scheduler and thus |
| 1856 | enter the sighandler immediately. */ |
njn | 9ec0f3e | 2005-03-13 06:00:47 +0000 | [diff] [blame] | 1857 | deliver_signal(tid, info); |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1858 | VG_(resume_scheduler)(tid); |
| 1859 | } |
| 1860 | |
| 1861 | /* Check to see if someone is interested in faults. */ |
| 1862 | if (fault_catcher) { |
| 1863 | (*fault_catcher)(sigNo, (Addr)info->_sifields._sigfault._addr); |
| 1864 | |
| 1865 | /* If the catcher returns, then it didn't handle the fault, |
| 1866 | so carry on panicing. */ |
| 1867 | } |
| 1868 | |
| 1869 | /* If resume_scheduler returns or its our fault, it means we |
| 1870 | don't have longjmp set up, implying that we weren't running |
| 1871 | client code, and therefore it was actually generated by |
| 1872 | Valgrind internally. |
| 1873 | */ |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1874 | VG_(message)(Vg_DebugMsg, |
| 1875 | "INTERNAL ERROR: Valgrind received a signal %d (%s) - exiting", |
| 1876 | sigNo, signame(sigNo)); |
fitzhardinge | 98abfc7 | 2003-12-16 02:05:15 +0000 | [diff] [blame] | 1877 | |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1878 | VG_(message)(Vg_DebugMsg, |
njn | d0073f4 | 2005-05-14 17:00:25 +0000 | [diff] [blame] | 1879 | "si_code=%x; Faulting address: %p; sp: %p", |
| 1880 | info->si_code, info->_sifields._sigfault._addr, |
| 1881 | VGP_UCONTEXT_STACK_PTR(uc)); |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1882 | |
| 1883 | if (0) |
| 1884 | VG_(kill_self)(sigNo); /* generate a core dump */ |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1885 | |
sewardj | 1d88711 | 2005-05-30 21:44:08 +0000 | [diff] [blame^] | 1886 | //if (tid == 0) /* could happen after everyone has exited */ |
| 1887 | // tid = VG_(master_tid); |
| 1888 | vg_assert(tid != 0); |
| 1889 | |
njn | cafca7b | 2005-03-13 04:39:28 +0000 | [diff] [blame] | 1890 | tst = VG_(get_ThreadState)(tid); |
njn | d01fef7 | 2005-03-25 23:35:48 +0000 | [diff] [blame] | 1891 | VG_(get_StackTrace2)(ips, VG_(clo_backtrace_size), |
njn | f6d228b | 2005-03-26 02:42:31 +0000 | [diff] [blame] | 1892 | VGP_UCONTEXT_INSTR_PTR(uc), |
sewardj | 3516553 | 2005-04-30 18:47:48 +0000 | [diff] [blame] | 1893 | VGP_UCONTEXT_STACK_PTR(uc), |
njn | f6d228b | 2005-03-26 02:42:31 +0000 | [diff] [blame] | 1894 | VGP_UCONTEXT_FRAME_PTR(uc), |
| 1895 | VGP_UCONTEXT_STACK_PTR(uc), |
njn | 990e90c | 2005-04-05 02:49:09 +0000 | [diff] [blame] | 1896 | tst->os_state.valgrind_stack_base + |
| 1897 | tst->os_state.valgrind_stack_szB); |
njn | d01fef7 | 2005-03-25 23:35:48 +0000 | [diff] [blame] | 1898 | VG_(core_panic_at)("Killed by fatal signal", ips); |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1899 | } |
| 1900 | } |
| 1901 | |
| 1902 | |
| 1903 | /* |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1904 | Kill this thread. Makes it leave any syscall it might be currently |
| 1905 | blocked in, and return to the scheduler. This doesn't mark the thread |
| 1906 | as exiting; that's the caller's job. |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1907 | */ |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1908 | static void sigvgkill_handler(int signo, vki_siginfo_t *si, struct vki_ucontext *uc) |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1909 | { |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1910 | ThreadId tid = VG_(get_lwp_tid)(VG_(gettid)()); |
| 1911 | |
| 1912 | if (VG_(clo_trace_signals)) |
| 1913 | VG_(message)(Vg_DebugMsg, "sigvgkill for lwp %d tid %d", VG_(gettid)(), tid); |
| 1914 | |
| 1915 | vg_assert(signo == VKI_SIGVGKILL); |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1916 | vg_assert(si->si_signo == signo); |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1917 | vg_assert(VG_(threads)[tid].status == VgTs_WaitSys); |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1918 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1919 | VG_(set_running)(tid); |
| 1920 | VG_(post_syscall)(tid); |
| 1921 | |
| 1922 | VG_(resume_scheduler)(tid); |
| 1923 | |
| 1924 | VG_(core_panic)("sigvgkill_handler couldn't return to the scheduler\n"); |
sewardj | de4a1d0 | 2002-03-22 01:27:54 +0000 | [diff] [blame] | 1925 | } |
| 1926 | |
sewardj | de4a1d0 | 2002-03-22 01:27:54 +0000 | [diff] [blame] | 1927 | static __attribute((unused)) |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 1928 | void pp_ksigaction ( struct vki_sigaction* sa ) |
sewardj | de4a1d0 | 2002-03-22 01:27:54 +0000 | [diff] [blame] | 1929 | { |
| 1930 | Int i; |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 1931 | VG_(printf)("pp_ksigaction: handler %p, flags 0x%x, restorer %p\n", |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 1932 | sa->ksa_handler, (UInt)sa->sa_flags, sa->sa_restorer); |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 1933 | VG_(printf)("pp_ksigaction: { "); |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1934 | for (i = 1; i <= VG_(max_signal); i++) |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 1935 | if (VG_(sigismember(&(sa->sa_mask),i))) |
sewardj | de4a1d0 | 2002-03-22 01:27:54 +0000 | [diff] [blame] | 1936 | VG_(printf)("%d ", i); |
| 1937 | VG_(printf)("}\n"); |
| 1938 | } |
| 1939 | |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1940 | /* |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1941 | Force signal handler to default |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1942 | */ |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1943 | void VG_(set_default_handler)(Int signo) |
| 1944 | { |
| 1945 | struct vki_sigaction sa; |
| 1946 | |
| 1947 | sa.ksa_handler = VKI_SIG_DFL; |
| 1948 | sa.sa_flags = 0; |
| 1949 | sa.sa_restorer = 0; |
| 1950 | VG_(sigemptyset)(&sa.sa_mask); |
| 1951 | |
| 1952 | VG_(do_sys_sigaction)(signo, &sa, NULL); |
| 1953 | } |
| 1954 | |
| 1955 | /* |
| 1956 | Poll for pending signals, and set the next one up for delivery. |
| 1957 | */ |
| 1958 | void VG_(poll_signals)(ThreadId tid) |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1959 | { |
| 1960 | static const struct vki_timespec zero = { 0, 0 }; |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1961 | vki_siginfo_t si, *sip; |
| 1962 | vki_sigset_t pollset; |
| 1963 | ThreadState *tst = VG_(get_ThreadState)(tid); |
| 1964 | Int i; |
| 1965 | vki_sigset_t saved_mask; |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1966 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1967 | /* look for all the signals this thread isn't blocking */ |
| 1968 | for(i = 0; i < _VKI_NSIG_WORDS; i++) |
| 1969 | pollset.sig[i] = ~tst->sig_mask.sig[i]; |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1970 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1971 | //VG_(printf)("tid %d pollset=%08x%08x\n", tid, pollset.sig[1], pollset.sig[0]); |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 1972 | |
njn | 444eba1 | 2005-05-12 03:47:31 +0000 | [diff] [blame] | 1973 | block_all_host_signals(&saved_mask); // protect signal queue |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1974 | |
| 1975 | /* First look for any queued pending signals */ |
| 1976 | sip = next_queued(tid, &pollset); /* this thread */ |
| 1977 | |
| 1978 | if (sip == NULL) |
| 1979 | sip = next_queued(0, &pollset); /* process-wide */ |
| 1980 | |
| 1981 | /* If there was nothing queued, ask the kernel for a pending signal */ |
| 1982 | if (sip == NULL && VG_(sigtimedwait)(&pollset, &si, &zero) > 0) { |
| 1983 | if (VG_(clo_trace_signals)) |
| 1984 | VG_(message)(Vg_DebugMsg, "poll_signals: got signal %d for thread %d", si.si_signo, tid); |
| 1985 | sip = &si; |
thughes | 8abf392 | 2004-10-16 10:59:49 +0000 | [diff] [blame] | 1986 | } |
fitzhardinge | e1c06d8 | 2003-10-30 07:21:44 +0000 | [diff] [blame] | 1987 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1988 | if (sip != NULL) { |
| 1989 | /* OK, something to do; deliver it */ |
| 1990 | if (VG_(clo_trace_signals)) |
| 1991 | VG_(message)(Vg_DebugMsg, "Polling found signal %d for tid %d", |
| 1992 | sip->si_signo, tid); |
njn | 07ef6c0 | 2005-05-18 19:43:09 +0000 | [diff] [blame] | 1993 | if (!is_sig_ign(sip->si_signo)) |
njn | 9ec0f3e | 2005-03-13 06:00:47 +0000 | [diff] [blame] | 1994 | deliver_signal(tid, sip); |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 1995 | else if (VG_(clo_trace_signals)) |
| 1996 | VG_(message)(Vg_DebugMsg, " signal %d ignored", sip->si_signo); |
| 1997 | |
| 1998 | sip->si_signo = 0; /* remove from signal queue, if that's |
| 1999 | where it came from */ |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 2000 | } |
| 2001 | |
njn | 444eba1 | 2005-05-12 03:47:31 +0000 | [diff] [blame] | 2002 | restore_all_host_signals(&saved_mask); |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 2003 | } |
| 2004 | |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 2005 | /* At startup, copy the process' real signal state to the SCSS. |
| 2006 | Whilst doing this, block all real signals. Then calculate SKSS and |
| 2007 | set the kernel to that. Also initialise DCSS. |
sewardj | de4a1d0 | 2002-03-22 01:27:54 +0000 | [diff] [blame] | 2008 | */ |
| 2009 | void VG_(sigstartup_actions) ( void ) |
| 2010 | { |
| 2011 | Int i, ret; |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 2012 | vki_sigset_t saved_procmask; |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 2013 | struct vki_sigaction sa; |
sewardj | de4a1d0 | 2002-03-22 01:27:54 +0000 | [diff] [blame] | 2014 | |
sewardj | 2e93c50 | 2002-04-12 11:12:52 +0000 | [diff] [blame] | 2015 | /* VG_(printf)("SIGSTARTUP\n"); */ |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 2016 | /* Block all signals. saved_procmask remembers the previous mask, |
| 2017 | which the first thread inherits. |
| 2018 | */ |
njn | 444eba1 | 2005-05-12 03:47:31 +0000 | [diff] [blame] | 2019 | block_all_host_signals( &saved_procmask ); |
sewardj | de4a1d0 | 2002-03-22 01:27:54 +0000 | [diff] [blame] | 2020 | |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 2021 | /* Copy per-signal settings to SCSS. */ |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 2022 | for (i = 1; i <= _VKI_NSIG; i++) { |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 2023 | /* Get the old host action */ |
nethercote | 73b526f | 2004-10-31 18:48:21 +0000 | [diff] [blame] | 2024 | ret = VG_(sigaction)(i, NULL, &sa); |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 2025 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 2026 | if (ret != 0) |
| 2027 | break; |
| 2028 | |
| 2029 | /* Try setting it back to see if this signal is really |
| 2030 | available */ |
| 2031 | if (i >= VKI_SIGRTMIN) { |
| 2032 | struct vki_sigaction tsa; |
| 2033 | |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 2034 | tsa.ksa_handler = (void *)sync_signalhandler; |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 2035 | tsa.sa_flags = VKI_SA_SIGINFO; |
| 2036 | tsa.sa_restorer = 0; |
| 2037 | VG_(sigfillset)(&tsa.sa_mask); |
| 2038 | |
| 2039 | /* try setting it to some arbitrary handler */ |
| 2040 | if (VG_(sigaction)(i, &tsa, NULL) != 0) { |
| 2041 | /* failed - not really usable */ |
| 2042 | break; |
| 2043 | } |
| 2044 | |
| 2045 | ret = VG_(sigaction)(i, &sa, NULL); |
| 2046 | vg_assert(ret == 0); |
| 2047 | } |
| 2048 | |
| 2049 | VG_(max_signal) = i; |
| 2050 | |
| 2051 | if (VG_(clo_trace_signals) && VG_(clo_verbosity) > 2) |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 2052 | VG_(printf)("snaffling handler 0x%x for signal %d\n", |
| 2053 | (Addr)(sa.ksa_handler), i ); |
| 2054 | |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 2055 | scss.scss_per_sig[i].scss_handler = sa.ksa_handler; |
| 2056 | scss.scss_per_sig[i].scss_flags = sa.sa_flags; |
| 2057 | scss.scss_per_sig[i].scss_mask = sa.sa_mask; |
| 2058 | scss.scss_per_sig[i].scss_restorer = sa.sa_restorer; |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 2059 | } |
| 2060 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 2061 | if (VG_(clo_trace_signals)) |
| 2062 | VG_(message)(Vg_DebugMsg, "Max kernel-supported signal is %d", VG_(max_signal)); |
| 2063 | |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 2064 | /* Our private internal signals are treated as ignored */ |
njn | 695c16e | 2005-03-27 03:40:28 +0000 | [diff] [blame] | 2065 | scss.scss_per_sig[VKI_SIGVGKILL].scss_handler = VKI_SIG_IGN; |
| 2066 | scss.scss_per_sig[VKI_SIGVGKILL].scss_flags = VKI_SA_SIGINFO; |
| 2067 | VG_(sigfillset)(&scss.scss_per_sig[VKI_SIGVGKILL].scss_mask); |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 2068 | |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 2069 | /* Copy the process' signal mask into the root thread. */ |
sewardj | 1d88711 | 2005-05-30 21:44:08 +0000 | [diff] [blame^] | 2070 | vg_assert(VG_(threads)[1].status == VgTs_Init); |
| 2071 | for (i = 2; i < VG_N_THREADS; i++) |
| 2072 | vg_assert(VG_(threads)[i].status == VgTs_Empty); |
| 2073 | |
| 2074 | VG_(threads)[1].sig_mask = saved_procmask; |
| 2075 | VG_(threads)[1].tmp_sig_mask = saved_procmask; |
sewardj | 7a61d91 | 2002-04-25 01:27:35 +0000 | [diff] [blame] | 2076 | |
sewardj | 018f762 | 2002-05-15 21:13:39 +0000 | [diff] [blame] | 2077 | /* Calculate SKSS and apply it. This also sets the initial kernel |
| 2078 | mask we need to run with. */ |
nethercote | 9dd1151 | 2004-08-04 15:31:30 +0000 | [diff] [blame] | 2079 | handle_SCSS_change( True /* forced update */ ); |
jsgf | 855d93d | 2003-10-13 22:26:55 +0000 | [diff] [blame] | 2080 | |
sewardj | b5f6f51 | 2005-03-10 23:59:00 +0000 | [diff] [blame] | 2081 | /* Leave with all signals still blocked; the thread scheduler loop |
| 2082 | will set the appropriate mask at the appropriate time. */ |
sewardj | de4a1d0 | 2002-03-22 01:27:54 +0000 | [diff] [blame] | 2083 | } |
| 2084 | |
sewardj | de4a1d0 | 2002-03-22 01:27:54 +0000 | [diff] [blame] | 2085 | /*--------------------------------------------------------------------*/ |
| 2086 | /*--- end vg_signals.c ---*/ |
| 2087 | /*--------------------------------------------------------------------*/ |