[rfc] dwarf2 backtrace from setcontext
Andreas Jaeger
aj@suse.de
Thu Jan 22 08:16:00 GMT 2004
Thanks. Here's the version that I'm going to commit now,
Andreas
============================================================
Index: sysdeps/unix/sysv/linux/x86_64/setcontext.S
--- sysdeps/unix/sysv/linux/x86_64/setcontext.S 31 Aug 2002 08:05:51 -0000 1.2
+++ sysdeps/unix/sysv/linux/x86_64/setcontext.S 22 Jan 2004 08:16:49 -0000
@@ -1,5 +1,5 @@
/* Install given context.
- Copyright (C) 2002 Free Software Foundation, Inc.
+ Copyright (C) 2002, 2004 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Andreas Jaeger <aj@suse.de>, 2002.
@@ -35,6 +35,7 @@
ENTRY(__setcontext)
/* Save argument since syscall will destroy it. */
pushq %rdi
+ cfi_adjust_cfa_offset(8)
/* Set the signal mask with
rt_sigprocmask (SIG_SETMASK, mask, NULL, _NSIG/8). */
@@ -45,6 +46,7 @@ ENTRY(__setcontext)
movq $__NR_rt_sigprocmask, %rax
syscall
popq %rdi /* Reload %rdi, adjust stack. */
+ cfi_adjust_cfa_offset(-8)
cmpq $-4095, %rax /* Check %rax for error. */
jae SYSCALL_ERROR_LABEL /* Jump to error handler if error. */
@@ -57,6 +59,16 @@ ENTRY(__setcontext)
/* 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
@@ -78,6 +90,10 @@ ENTRY(__setcontext)
/* Setup finally %rdi. */
movq oRDI(%rdi), %rdi
+
+ /* End FDE here, we fall into another context. */
+ cfi_endproc
+ cfi_startproc
/* Clear rax to indicate success. */
xorq %rax, %rax
--
Andreas Jaeger, aj@suse.de, http://www.suse.de/~aj
SuSE Linux AG, Maxfeldstr. 5, 90409 Nürnberg, Germany
GPG fingerprint = 93A3 365E CE47 B889 DF7F FED1 389A 563C C272 A126
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