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Date: Sun, 11 Jan 2004 18:50:00 -0000
From: Jakub Jelinek <jakub@redhat.com>
To: Andreas Jaeger <aj@suse.de>
Cc: Richard Henderson <rth@redhat.com>,
   Glibc hackers <libc-hacker@sources.redhat.com>
Subject: Re: [PATCH] Fix AMD64 backtrace
Message-ID: <20040111164256.GN6413@sunsite.ms.mff.cuni.cz>
Reply-To: Jakub Jelinek <jakub@redhat.com>
References: <20040110175049.GM6413@sunsite.ms.mff.cuni.cz> <m3smina7f1.fsf@gromit.moeb> <m3n08u93ax.fsf@gromit.moeb> <20040111024737.A1431@redhat.com> <m3isji92u3.fsf@gromit.moeb> <20040111025223.A2564@redhat.com> <m3eku692mz.fsf@gromit.moeb> <m37jzy92hr.fsf@gromit.moeb> <20040111030005.C13258@redhat.com> <m3wu7y7k7j.fsf@gromit.moeb>
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On Sun, Jan 11, 2004 at 01:17:52PM +0100, Andreas Jaeger wrote:
> 	/* Load the new stack pointer, the preserved registers and
> 	   registers used for passing args.  */
> 	cfi_def_cfa(%rdi, 0)
> 	cfi_offset(%rbx,oRBX)
> 	cfi_offset(%rbp,oRBP)
> 	cfi_offset(%r12,oR12)
> 	cfi_offset(%r13,oR13)
> 	cfi_offset(%r14,oR14)
> 	cfi_offset(%r15,oR15)
> 	cfi_offset(%rsp,oRSP)
> 	cfi_offset(%rip,oRIP)
> 	
> 	movq	oRSP(%rdi), %rsp
> 	movq	oRBX(%rdi), %rbx
> 	movq	oRBP(%rdi), %rbp
> 	movq	oR12(%rdi), %r12
> 	movq	oR13(%rdi), %r13
> 	movq	oR14(%rdi), %r14
> 	movq	oR15(%rdi), %r15
> 
> 	/* The following ret should return to the address set with
> 	getcontext.  Therefore push the address on the stack.  */
> 	movq	oRIP(%rdi), %rcx
> 	pushq	%rcx
> 	cfi_adjust_cfa_offset(8)

pushq %rcx modifies %rsp, but current CFI here is %rdi
which is unchanged.

	Jakub