[src/trunk]: src/lib/csu/arch/x86_64 Fix stack alignment for non-constructor/...

[joerg <joerg%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/ea3b9c8998bb
branches:  trunk
changeset: 759164:ea3b9c8998bb
user:      joerg <joerg%NetBSD.org@localhost>
date:      Tue Nov 30 18:37:59 2010 +0000

description:
Fix stack alignment for non-constructor/destructor calls.
AMD64 stack is 16 Byte aligned at the start of the function,
so always push rbx.

diffstat:

 lib/csu/arch/x86_64/crtbegin.S |  11 +++++------
 1 files changed, 5 insertions(+), 6 deletions(-)

diffs (66 lines):

diff -r 78daeeee5d08 -r ea3b9c8998bb lib/csu/arch/x86_64/crtbegin.S
--- a/lib/csu/arch/x86_64/crtbegin.S    Tue Nov 30 18:20:41 2010 +0000
+++ b/lib/csu/arch/x86_64/crtbegin.S    Tue Nov 30 18:37:59 2010 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: crtbegin.S,v 1.1 2010/08/07 18:01:34 joerg Exp $       */
+/*     $NetBSD: crtbegin.S,v 1.2 2010/11/30 18:37:59 joerg Exp $       */
 /*-
  * Copyright (c) 2010 Joerg Sonnenberger <joerg%NetBSD.org@localhost>
  * All rights reserved.
@@ -30,7 +30,7 @@
 
 #include <machine/asm.h>
 
-RCSID("$NetBSD: crtbegin.S,v 1.1 2010/08/07 18:01:34 joerg Exp $")
+RCSID("$NetBSD: crtbegin.S,v 1.2 2010/11/30 18:37:59 joerg Exp $")
 
        .section        .ctors, "aw", @progbits
        .align 8
@@ -82,6 +82,7 @@
        je      1f
        ret
 1:
+       pushq   %rbx
        movb    $1, __finished(%rip)
 
 
@@ -93,7 +94,6 @@
 2:
 #endif
 
-       pushq   %rbx
        leaq    8+__DTOR_LIST__(%rip), %rbx
 3:
        movq    (%rbx), %rax
@@ -103,14 +103,13 @@
        addq    $8, %rbx
        jmp     3b      
 4:
-       popq    %rbx
 
        cmpq    $0, __deregister_frame_info@GOTPCREL(%rip)
        je      5f
        leaq    __EH_FRAME_LIST__(%rip), %rdi
        call    __deregister_frame_info@PLT
 5:
-
+       popq    %rbx
        ret
 
 
@@ -119,6 +118,7 @@
        je      1f
        ret
 1:
+       pushq   %rbx
        movb    $1, __initialized(%rip)
 
        cmpq    $0, __register_frame_info@GOTPCREL(%rip)
@@ -136,7 +136,6 @@
        call    _Jv_RegisterClasses@PLT
 3:
 
-       pushq   %rbx
        leaq    -8+__CTOR_LIST_END__(%rip), %rbx
 4:
        movq    (%rbx), %rax