Unwinding stop on irq handler or across it?

Yao Qi qiyaoltc at gmail.com
Wed May 17 09:04:26 PDT 2017


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 (齐尧)



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