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Use %rdi as temp register instead of destroying %rbx.

This commit is contained in:
Andreas Jaeger 2002-04-22 05:58:12 +00:00
parent 47cbdebd7e
commit 04d12383c8
1 changed files with 6 additions and 5 deletions
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11
sysdeps/unix/sysv/linux/x86_64/vfork.S
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@ -1,4 +1,4 @@
/* Copyright (C) 2001 Free Software Foundation, Inc.
/* Copyright (C) 2001, 2002 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -27,8 +27,9 @@
ENTRY (__vfork)
/* Pop the return PC value into RBX. */
popq %rbx
/* Pop the return PC value into RDI. We need a register that
is preserved by the syscall and that we're allowed to destroy. */
popq %rdi
/* Stuff the syscall number in RAX and enter into the kernel. */
movl $SYS_ify (vfork), %eax
@ -37,11 +38,11 @@ ENTRY (__vfork)
jae .Lerror /* Branch forward if it failed. */
/* Jump to the return PC. */
jmp *%rbx
jmp *%rdi
.Lerror:
/* Push back the return PC. */
pushq %rbx
pushq %rdi
jmp SYSCALL_ERROR_LABEL
.Lpseudo_end: