gdb_wait.cc revision 1.1.1.2 
1/* Support code for standard wait macros in gdb_wait.h.
2
3   Copyright (C) 2019-2023 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
44struct 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
53int
54windows_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__ */
86