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[PATCH] x86_64: reliable stack trace support (x86-64 IRQ stack

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Change the switching to/from the IRQ stack so that unwind annotations can
be added for it without requiring CFA expressions.

AK: I cleaned it up a bit, making it unconditional and removing the
obsolete DEBUG_INFO full frame code.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jan Beulich 2006-06-26 13:57:35 +02:00 committed by Linus Torvalds
parent b538ed278b
commit 1de9c3f67e
1 changed files with 8 additions and 25 deletions
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33
arch/x86_64/kernel/entry.S
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@ -473,29 +473,18 @@ END(stub_rt_sigreturn)
/* 0(%rsp): interrupt number */
.macro interrupt func
cld
#ifdef CONFIG_DEBUG_INFO
SAVE_ALL
movq %rsp,%rdi
/*
* Setup a stack frame pointer. This allows gdb to trace
* back to the original stack.
*/
movq %rsp,%rbp
CFI_DEF_CFA_REGISTER rbp
#else
SAVE_ARGS
leaq -ARGOFFSET(%rsp),%rdi # arg1 for handler
#endif
pushq %rbp
CFI_ADJUST_CFA_OFFSET 8
CFI_REL_OFFSET rbp, 0
movq %rsp,%rbp
CFI_DEF_CFA_REGISTER rbp
testl $3,CS(%rdi)
je 1f
swapgs
1: incl %gs:pda_irqcount # RED-PEN should check preempt count
movq %gs:pda_irqstackptr,%rax
cmoveq %rax,%rsp /*todo This needs CFI annotation! */
pushq %rdi # save old stack
#ifndef CONFIG_DEBUG_INFO
CFI_ADJUST_CFA_OFFSET 8
#endif
cmoveq %gs:pda_irqstackptr,%rsp
call \func
.endm
@ -504,17 +493,11 @@ ENTRY(common_interrupt)
interrupt do_IRQ
/* 0(%rsp): oldrsp-ARGOFFSET */
ret_from_intr:
popq %rdi
#ifndef CONFIG_DEBUG_INFO
CFI_ADJUST_CFA_OFFSET -8
#endif
cli
decl %gs:pda_irqcount
#ifdef CONFIG_DEBUG_INFO
movq RBP(%rdi),%rbp
leaveq
CFI_DEF_CFA_REGISTER rsp
#endif
leaq ARGOFFSET(%rdi),%rsp /*todo This needs CFI annotation! */
CFI_ADJUST_CFA_OFFSET -8
exit_intr:
GET_THREAD_INFO(%rcx)
testl $3,CS-ARGOFFSET(%rsp)