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| author | Jakub Jelinek <jakub@redhat.com> | 2022-03-09 15:25:30 +0100 |
|---|---|---|
| committer | Jakub Jelinek <jakub@redhat.com> | 2022-03-09 15:25:30 +0100 |
| commit | caa6c33c5d5223c50657b08e73177e8d54ceee51 (patch) | |
| tree | f1b477d7ead599575a0fe1d64de2321f2718d7bf /gcc | |
| parent | ec0f53a3a542e762f8fc8c22b9d345f922be5867 (diff) | |
| download | gcc-caa6c33c5d5223c50657b08e73177e8d54ceee51.zip gcc-caa6c33c5d5223c50657b08e73177e8d54ceee51.tar.gz gcc-caa6c33c5d5223c50657b08e73177e8d54ceee51.tar.bz2 | |
x86: Define LIBGCC2_UNWIND_ATTRIBUTE on ia32 [PR104781]
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.
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/config/i386/i386.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/gcc/config/i386/i386.h b/gcc/config/i386/i386.h index b37d4a9..0d28e57 100644 --- a/gcc/config/i386/i386.h +++ b/gcc/config/i386/i386.h @@ -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 |