From e3657ba5992468f0340efdb741ec32ac0e0acb5c Mon Sep 17 00:00:00 2001 From: Rich Felker Date: Wed, 16 Feb 2011 09:50:57 -0500 Subject: [PATCH] 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. --- src/thread/x86_64/__set_thread_area.s | 4 ---- 1 file changed, 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 -- 2.25.1