diff options
| author |   kettenis <kettenis@openbsd.org> | 2011-08-19 07:59:49 +0000 |
|---|---|---|
| committer | kettenis <kettenis@openbsd.org> | 2011-08-19 07:59:49 +0000 |
| commit | 40e3d44f37812158b1a619108f978b053becf12b (patch) | |
| tree | 40a6bdfc0df78630a85e80c27997a84c0ba6016c | |
| parent | remove error in previous; (diff) | |
| download | wireguard-openbsd-40e3d44f37812158b1a619108f978b053becf12b.tar.xz wireguard-openbsd-40e3d44f37812158b1a619108f978b053becf12b.zip | |
Make sure the stack is properly aligned for using SSE instructions. While
our in-tree compiler will emit code to do this at the start of main(), other
compilers might not do that.
ok miod@
| -rw-r--r-- | lib/csu/i386/crt0.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/lib/csu/i386/crt0.c b/lib/csu/i386/crt0.c index d500079e0ef..1fc2de931e7 100644 --- a/lib/csu/i386/crt0.c +++ b/lib/csu/i386/crt0.c @@ -1,4 +1,4 @@ -/* $OpenBSD: crt0.c,v 1.13 2005/08/04 16:33:05 espie Exp $ */ +/* $OpenBSD: crt0.c,v 1.14 2011/08/19 07:59:49 kettenis Exp $ */ /* $NetBSD: crt0.c,v 1.20 1995/06/03 13:16:08 pk Exp $ */ /* @@ -56,15 +56,20 @@ __asm(".text\n" " .globl _start\n" "_start:\n" "__start:\n" -" pushl %ebx #ps_strings\n" +" movl %esp,%ebp\n" +" subl $12,%esp # align stack\n" +" andl $~15,%esp\n" +" addl $12,%esp\n" +" pushl %ebx # ps_strings\n" " pushl %ecx # obj\n" " pushl %edx # cleanup\n" -" movl 12(%esp),%eax\n" -" leal 20(%esp,%eax,4),%ecx\n" -" leal 16(%esp),%edx\n" +" movl 0(%ebp),%eax\n" +" leal 8(%ebp,%eax,4),%ecx\n" +" leal 4(%ebp),%edx\n" " pushl %ecx\n" " pushl %edx\n" " pushl %eax\n" +" xorl %ebp,%ebp # mark deepest stack frame\n" " call ___start "); void |