[PATCH] Fix AMD64 backtrace

[Jakub Jelinek]

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