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| author | Rich Felker <dalias@aerifal.cx> | 2011-02-16 09:50:57 -0500 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2011-02-16 09:50:57 -0500 |
| commit | e3657ba5992468f0340efdb741ec32ac0e0acb5c (patch) | |
| tree | 1cbf6679a99c1dc52a9d766d2d2d96fa2e3dad30 | |
| parent | 22cd9cae819a0fd432da4b1d21502a242871e5d9 (diff) | |
| download | musl-e3657ba5992468f0340efdb741ec32ac0e0acb5c.tar.gz musl-e3657ba5992468f0340efdb741ec32ac0e0acb5c.tar.xz musl-e3657ba5992468f0340efdb741ec32ac0e0acb5c.zip | |
patch by njk, simplifies thread register initialization for x86_64
It's not necessary to save any registers on the stack across syscall in x86_64 __set_thread_area. Don't waste cycles or bytes on it.
| -rw-r--r-- | src/thread/x86_64/__set_thread_area.s | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/src/thread/x86_64/__set_thread_area.s b/src/thread/x86_64/__set_thread_area.s index ed35b7a8..faf73ec4 100644 --- a/src/thread/x86_64/__set_thread_area.s +++ b/src/thread/x86_64/__set_thread_area.s @@ -3,13 +3,9 @@ .global __set_thread_area .type __set_thread_area,%function __set_thread_area: - push %rbx /* save x86_64 abi clobbered registers */ - push %r11 mov %rdi,%rsi /* shift for syscall */ movl $0x1002,%edi /* SET_FS register */ movl $158,%eax /* set fs segment to */ syscall /* arch_prctl(SET_FS, arg)*/ - pop %r11 /* restore clobbered registers */ - pop %rbx ret .size __set_thread_area,.-__set_thread_area |