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Re: [PATCH/arm] Backtrace through exception frames on arm/cortex-m target

On 11/13/2012 10:27 PM, Mark Kettenis wrote:
+ unwound_sp = get_frame_register_unsigned (this_frame, ARM_SP_REGNUM); 
Calling get_frame_register_unsign(this_frame, ...) in the unwinder
itself is verboten!.

Really? It is a surprise to me. I see get_frame_register_unsigned is called in many other unwinders, for example,

*** alpha-mdebug-tdep.c:
alpha_mdebug_frame_unwind_cache[217] vfp = get_frame_register_unsigned (this_frame, PROC_FRAME_REG (proc_desc));

*** amd64obsd-tdep.c:
amd64obsd_trapframe_cache[373] sp = get_frame_register_unsigned (this_frame, AMD64_RSP_REGNUM);

*** arm-linux-tdep.c:
arm_linux_sigtramp_cache[258] CORE_ADDR sp = get_frame_register_unsigned (this_frame, ARM_SP_REGNUM);

*** avr-tdep.c:
avr_frame_unwind_cache[987] this_base = get_frame_register_unsigned (this_frame, AVR_FP_REGNUM);

Am I missing something?

--
Yao

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