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| author | Szabolcs Nagy <szabolcs.nagy@arm.com> | 2016-07-11 09:46:08 +0100 |
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| committer | Szabolcs Nagy <szabolcs.nagy@arm.com> | 2016-07-11 09:50:41 +0100 |
| commit | efbe665c3a2d344b0d64456cf29499ba53c2965a (patch) | |
| tree | 2b4f2072c5b1c0ad5c30af13cd8c927a574ddd9b /sysdeps/x86_64/sysdep.h | |
| parent | 468700675f7f36d55758c36b1ed902250470e8ec (diff) | |
| download | glibc-efbe665c3a2d344b0d64456cf29499ba53c2965a.tar.gz glibc-efbe665c3a2d344b0d64456cf29499ba53c2965a.tar.xz glibc-efbe665c3a2d344b0d64456cf29499ba53c2965a.zip | |
[AArch64] Fix libc internal asm profiling code
When glibc is built with --enable-profile, the ENTRY of asm functions includes CALL_MCOUNT for profiling. (matters for binaries static linked against libc_p.a.) CALL_MCOUNT did not save/restore argument registers around the _mcount call so it clobbered them. (it is enough to only save/restore the arguments passed to a given asm function, but that would be too many asm changes so it is simpler to always save all argument registers in this macro.) float args are not saved: mcount does not clobber the float regs and currently no asm function takes float arguments anyway. [BZ #18707] * sysdeps/aarch64/Makefile (CFLAGS-mcount.c): Add -mgeneral-regs-only. * sysdeps/aarch64/sysdep.h (CALL_MCOUNT): Save argument registers.
Diffstat (limited to 'sysdeps/x86_64/sysdep.h')
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