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Improve process exit status macros on MinGW

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When a Windows program is terminated by a fatal exception, its exit
code is the value of that exception, as defined by the various
EXCEPTION_* symbols in the Windows API headers.  This commit emulates
WTERMSIG etc. by translating the fatal exception codes to more-or-less
equivalent Posix signals.

gdb/ChangeLog:
2020-01-06  Eli Zaretskii  <eliz@gnu.org>
	    Pedro Alves  <palves@redhat.com>

	* Makefile.in (COMMON_SFILES): Add gdbsupport/gdb_wait.c.
	* windows-tdep.c: New enumeration of WINDOWS_SIG* signals.
	(windows_gdb_signal_to_target): New function, uses the above
	enumeration to convert GDB internal signal codes to equivalent
	Windows codes.
	(windows_init_abi): Call set_gdbarch_gdb_signal_to_target.
	* windows-nat.c: Include "gdb_wait.h".
	(get_windows_debug_event): Extract the fatal exception from the
	exit status and convert to the equivalent Posix signal number.
	* cli/cli-cmds.c (exit_status_set_internal_vars): Account for the
	possibility that WTERMSIG returns GDB_SIGNAL_UNKNOWN.
	* gdbsupport/gdb_wait.c: New file, implements
	windows_status_to_termsig.
	* gdbsupport/gdb_wait.h (WIFEXITED, WIFSIGNALED, WEXITSTATUS)
	(WTERMSIG) [__MINGW32__]: Separate definitions for MinGW.

gdb/gdbserver/ChangeLog:
2020-01-06  Eli Zaretskii  <eliz@gnu.org>
	    Pedro Alves  <palves@redhat.com>

	* win32-low.c (get_child_debug_event): Extract the fatal exception
	from the exit status and convert to the equivalent Posix signal
	number.
	(win32_wait): Allow TARGET_WAITKIND_SIGNALLED status as well.
	* Makefile.in (OBS, SFILES): Add gdb_wait.[co].
This commit is contained in:
Eli Zaretskii
2020-01-06 11:51:54 +00:00
committed by Pedro Alves
parent 49078ece04
commit 559e7e5056
10 changed files with 322 additions and 10 deletions
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12
gdb/cli/cli-cmds.c
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@@ -800,6 +800,18 @@ exit_status_set_internal_vars (int exit_status)
clear_internalvar (var_signal);
if (WIFEXITED (exit_status))
set_internalvar_integer (var_code, WEXITSTATUS (exit_status));
#ifdef __MINGW32__
else if (WIFSIGNALED (exit_status) && WTERMSIG (exit_status) == -1)
{
/* The -1 condition can happen on MinGW, if we don't recognize
the fatal exception code encoded in the exit status; see
gdbsupport/gdb_wait.c. We don't want to lose information in
the exit status in that case. Record it as a normal exit
with the full exit status, including the higher 0xC0000000
bits. */
set_internalvar_integer (var_code, exit_status);
}
#endif
else if (WIFSIGNALED (exit_status))
set_internalvar_integer (var_signal, WTERMSIG (exit_status));
else