* Unwinding stop on irq handler or across it?
@ 2017-05-17 16:04 Yao Qi
2017-05-23 12:49 ` Johannes Stoelp
0 siblings, 1 reply; 2+ messages in thread
From: Yao Qi @ 2017-05-17 16:04 UTC (permalink / raw)
To: linux-arm-kernel
Hi,
When use GDB debug Linux kernel, GDB can't stop on unwinding from an irq
handler,
#0 gic_handle_irq (regs=0xffffffc07d9c7e30) at drivers/irqchip/irq-gic.c:263
#1 0xffffffc000083ce4 in el1_irq () at arch/arm64/kernel/entry.S:346
#2 0xffffffc000083ce4 in el1_irq () at arch/arm64/kernel/entry.S:346
#3 0xffffffc000083ce4 in el1_irq () at arch/arm64/kernel/entry.S:346
....
This problem can be fixed by either adding .cfi directives in entry.S
or adding some Linux awareness into GDB. I want to know what is the
expected behavior? Is it reasonable that stack unwinding stops on irq
handler, like el1_irq in this case? or something else?
--
Yao (??)
^ permalink raw reply [flat|nested] 2+ messages in thread
* Unwinding stop on irq handler or across it?
2017-05-17 16:04 Unwinding stop on irq handler or across it? Yao Qi
@ 2017-05-23 12:49 ` Johannes Stoelp
0 siblings, 0 replies; 2+ messages in thread
From: Johannes Stoelp @ 2017-05-23 12:49 UTC (permalink / raw)
To: linux-arm-kernel
Hi all,
> Hi,
> When use GDB debug Linux kernel, GDB can't stop on unwinding from an irq handler,
> #0 gic_handle_irq (regs=0xffffffc07d9c7e30) at drivers/irqchip/irq-gic.c:263
> #1 0xffffffc000083ce4 in el1_irq () at arch/arm64/kernel/entry.S:346
> #2 0xffffffc000083ce4 in el1_irq () at arch/arm64/kernel/entry.S:346
> #3 0xffffffc000083ce4 in el1_irq () at arch/arm64/kernel/entry.S:346 ....
> This problem can be fixed by either adding .cfi directives in entry.S or adding some Linux awareness into GDB. I want to know what is the expected behavior? Is it reasonable that stack unwinding stops on irq handler, like el1_irq in this case? or something else?
> Yao (??)
I'm really interested in finding a solution to this issue, do you have any comments on Yao's mail?
Best,
Johannes
^ permalink raw reply [flat|nested] 2+ messages in thread
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2017-05-17 16:04 Unwinding stop on irq handler or across it? Yao Qi
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