Messages in this thread | | | Subject | Re: [PATCH] MIPS: IRQ Stack: Unwind IRQ stack onto task stack | From | Matt Redfearn <> | Date | Tue, 4 Apr 2017 13:18:58 +0100 |
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Hi Jason,
On 04/04/17 12:58, Jason A. Donenfeld wrote: > This indeed is useful. Out of curiosity, are other archs using a > similar technique? In anycase, > > Acked-by: Jason A. Donenfeld <Jason@zx2c4.com>
Yes, at least x86 and ARM64 do the same thing (probably more)
x86 saves the previous stack pointer on the IRQ stack in http://lxr.free-electrons.com/source/arch/x86/kernel/irq_32.c#L70 which is then unwound in http://lxr.free-electrons.com/source/arch/x86/kernel/dumpstack.c#L51
ARM64 saves the task SP in http://lxr.free-electrons.com/source/arch/arm64/kernel/entry.S#L249 And unwinds it in http://lxr.free-electrons.com/source/arch/arm64/kernel/traps.c#L140
Thanks, Matt
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