gdbsupport/gdb_wait.cc

   1 /* Support code for standard wait macros in gdb_wait.h.
   2
   3    Copyright (C) 2019 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "common-defs.h"
  21
  22 #include "gdb_wait.h"
  23
  24 #ifdef __MINGW32__
  25
  26 /* The underlying idea is that when a Windows program is terminated by
  27    a fatal exception, its exit code is the value of that exception, as
  28    defined by the various EXCEPTION_* symbols in the Windows API
  29    headers.  We thus emulate WTERMSIG etc. by translating the fatal
  30    exception codes to more-or-less equivalent Posix signals.
  31
  32    The translation below is not perfect, because a program could
  33    legitimately exit normally with a status whose value happens to
  34    have the high bits set, but that's extremely rare, to say the
  35    least, and it is deemed such a negligibly small probability of
  36    false positives is justified by the utility of reporting the
  37    terminating signal in the "normal" cases.  */
  38
  39 # include <signal.h>
  40
  41 # define WIN32_LEAN_AND_MEAN
  42 # include <windows.h>           /* for EXCEPTION_* constants */
  43
  44 struct xlate_status
  45 {
  46   /* The exit status (actually, fatal exception code).  */
  47   DWORD status;
  48
  49   /* The corresponding signal value.  */
  50   int sig;
  51 };
  52
  53 int
  54 windows_status_to_termsig (unsigned long status)
  55 {
  56   static const xlate_status status_xlate_tbl[] =
  57     {
  58      {EXCEPTION_ACCESS_VIOLATION,         SIGSEGV},
  59      {EXCEPTION_IN_PAGE_ERROR,            SIGSEGV},
  60      {EXCEPTION_INVALID_HANDLE,           SIGSEGV},
  61      {EXCEPTION_ILLEGAL_INSTRUCTION,      SIGILL},
  62      {EXCEPTION_NONCONTINUABLE_EXCEPTION, SIGILL},
  63      {EXCEPTION_ARRAY_BOUNDS_EXCEEDED,    SIGSEGV},
  64      {EXCEPTION_FLT_DENORMAL_OPERAND,     SIGFPE},
  65      {EXCEPTION_FLT_DIVIDE_BY_ZERO,       SIGFPE},
  66      {EXCEPTION_FLT_INEXACT_RESULT,       SIGFPE},
  67      {EXCEPTION_FLT_INVALID_OPERATION,    SIGFPE},
  68      {EXCEPTION_FLT_OVERFLOW,             SIGFPE},
  69      {EXCEPTION_FLT_STACK_CHECK,          SIGFPE},
  70      {EXCEPTION_FLT_UNDERFLOW,            SIGFPE},
  71      {EXCEPTION_INT_DIVIDE_BY_ZERO,       SIGFPE},
  72      {EXCEPTION_INT_OVERFLOW,             SIGFPE},
  73      {EXCEPTION_PRIV_INSTRUCTION,         SIGILL},
  74      {EXCEPTION_STACK_OVERFLOW,           SIGSEGV},
  75      {CONTROL_C_EXIT,                     SIGTERM}
  76     };
  77
  78   for (const xlate_status &x : status_xlate_tbl)
  79     if (x.status == status)
  80       return x.sig;
  81
  82   return -1;
  83 }
  84
  85 #endif  /* __MINGW32__ */