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x86: Define LIBGCC2_UNWIND_ATTRIBUTE on ia32 [PR104781]

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On Mon, Mar 07, 2022 at 07:06:28AM -0800, H.J. Lu wrote:
> Since eh_return doesn't work with stack realignment, disable SSE on
> unwind-c.c and unwind-dw2.c to avoid stack realignment with the 4-byte
> incoming stack to avoid SSE usage which is caused by

The following change does that using LIBGCC2_UNWIND_ATTRIBUTE macro instead,
for ia32 only by forcing -mgeneral-regs-only on routines that call
__builtin_eh_return in libgcc.

2022-03-09  Jakub Jelinek  <jakub@redhat.com>

	PR target/104781
	* config/i386/i386.h (LIBGCC2_UNWIND_ATTRIBUTE): Define for ia32.
This commit is contained in:
Jakub Jelinek 2022-03-09 15:25:30 +01:00
parent ec0f53a3a5
commit caa6c33c5d
1 changed files with 6 additions and 0 deletions
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6
gcc/config/i386/i386.h
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@ -2848,6 +2848,12 @@ extern enum attr_cpu ix86_schedule;
#define NUM_X86_64_MS_CLOBBERED_REGS 12
#endif
/* __builtin_eh_return can't handle stack realignment, so restrict to
general regs in 32-bit libgcc functions that call it. */
#ifndef __x86_64__
#define LIBGCC2_UNWIND_ATTRIBUTE __attribute__((target ("general-regs-only")))
#endif
/*
Local variables:
version-control: t