[src/trunk]: src/libexec/ld.elf_so/arch/x86_64 Add comment about the unusual ...

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

details:   https://anonhg.NetBSD.org/src/rev/1cd53153810f
branches:  trunk
changeset: 759252:1cd53153810f
user:      joerg <joerg%NetBSD.org@localhost>
date:      Fri Dec 03 22:48:25 2010 +0000

description:
Add comment about the unusual stack alignment in .rtld_bind_start.

diffstat:

 libexec/ld.elf_so/arch/x86_64/rtld_start.S |  5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diffs (19 lines):

diff -r 29dd99bbec8f -r 1cd53153810f libexec/ld.elf_so/arch/x86_64/rtld_start.S
--- a/libexec/ld.elf_so/arch/x86_64/rtld_start.S        Fri Dec 03 21:41:40 2010 +0000
+++ b/libexec/ld.elf_so/arch/x86_64/rtld_start.S        Fri Dec 03 22:48:25 2010 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: rtld_start.S,v 1.6 2003/02/28 22:37:35 mycroft Exp $   */
+/*     $NetBSD: rtld_start.S,v 1.7 2010/12/03 22:48:25 joerg Exp $     */
 
 /*
  * Copyright (c) 2001 Wasabi Systems, Inc.
@@ -67,6 +67,9 @@
        .globl  _rtld_bind_start
        .type   _rtld_bind_start,@function
 _rtld_bind_start:      # (obj, reloff)
+       # This function is called with a misaligned stack from the PLT
+       # due to the additional argument pushed.
+       # At this point %rsp % 16 == 8.
        pushfq                          # save caller-saved registers
        pushq   %rax
        pushq   %rcx