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

diff --git a/sysdeps/unix/sysv/linux/x86_64/vfork.S b/sysdeps/unix/sysv/linux/x86_64/vfork.S
index 0b5a90a..79f3260 100644 (file)
--- a/sysdeps/unix/sysv/linux/x86_64/vfork.S
+++ b/sysdeps/unix/sysv/linux/x86_64/vfork.S
@@ -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: