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Align in the stack before calling _rtld in the way the x86_64 ABI 

specifies. This is necessary to ensure that init functions are always
called with the correct alignment, e.g. in case they use SSE
instructions.
This commit is contained in:
joerg 2011-12-11 22:07:26 +00:00
parent ae1f085150
commit e86a1635be
1 changed files with 4 additions and 1 deletions
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5
libexec/ld.elf_so/arch/x86_64/rtld_start.S
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@ -1,4 +1,4 @@
/* $NetBSD: rtld_start.S,v 1.8 2010/12/05 00:56:07 joerg Exp $ */
/* $NetBSD: rtld_start.S,v 1.9 2011/12/11 22:07:26 joerg Exp $ */
/*
* Copyright (c) 2001 Wasabi Systems, Inc.
@ -47,6 +47,8 @@
movq %rsp,%r12 # stack pointer arg to _rtld
pushq %rbx # save ps_strings
andq $~15,%rsp # align rsp, to be restored from r12
leaq _GLOBAL_OFFSET_TABLE_(%rip),%rax
leaq _DYNAMIC(%rip),%rdi # &_DYNAMIC
movq %rdi,%rbx
@ -59,6 +61,7 @@
movq %rbx,%rsi
call _rtld # _rtld(sp, relocbase)
leaq -8(%r12),%rsp # restore saved rsp, including %rbx
popq %rbx # %rbx = ps_strings
popq %rdx # %rdx = cleanup
popq %rcx # %rcx = obj_main