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Optimize ____longjmp_chk for x86-64 a bit.

This commit is contained in:
Ulrich Drepper 2009-07-30 20:09:30 -07:00
parent 85d9d2f3a0
commit 07df809969
1 changed files with 3 additions and 5 deletions
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8
sysdeps/x86_64/____longjmp_chk.S
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@ -66,14 +66,12 @@ ENTRY(____longjmp_chk)
cmpq %r8, %rsp cmpq %r8, %rsp
jbe .Lok jbe .Lok
subq $32, %rsp subq $24, %rsp
cfi_adjust_cfa_offset(32) cfi_adjust_cfa_offset(24)
movq %r10, 24(%rsp)
xorl %edi, %edi xorl %edi, %edi
movq %rsp, %rsi movq %rsp, %rsi
movl $__NR_sigaltstack, %eax movl $__NR_sigaltstack, %eax
syscall syscall
movq 24(%rsp), %r10
testl %eax, %eax testl %eax, %eax
movl $0, %eax movl $0, %eax
jne .Lok jne .Lok
@ -127,7 +125,7 @@ ENTRY(____longjmp_chk)
.Lfail: xchgq %r8, %rsp .Lfail: xchgq %r8, %rsp
/* We want the stack trace to show that of the caller. */ /* We want the stack trace to show that of the caller. */
cfi_def_cfa(%rsp, 40) cfi_def_cfa(%rsp, 32)
cfi_restore(%rsp) cfi_restore(%rsp)
cfi_register(%rbp, %r9) cfi_register(%rbp, %r9)
cfi_restore(%rip) cfi_restore(%rip)