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Commit 05dc16d6 authored by Randolph Chung's avatar Randolph Chung Committed by Kyle McMartin
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[PARISC] unwinder improvements 



Add special-case handling for "handle_interruption" so that we can rewind
past the interruption. This is useful for seeing what caused a BUG() or
WARN_ON(); otherwise the unwind stops at the interruption.

Signed-off-by: default avatarRandolph Chung <tausq@debian.org>
Signed-off-by: default avatarKyle McMartin <kyle@parisc-linux.org>
parent e036306a

arch/parisc/kernel/unwind.c

+34 −7
Original line number Diff line number Diff line
@@ -16,6 +16,8 @@ 


#include <asm/uaccess.h>

#include <asm/assembly.h>

#include <asm/asm-offsets.h>

#include <asm/ptrace.h>



#include <asm/unwind.h>
@@ -199,6 +201,29 @@ static int unwind_init(void) 
	return 0;

}



#ifdef CONFIG_64BIT

#define get_func_addr(fptr) fptr[2]

#else

#define get_func_addr(fptr) fptr[0]

#endif



static int unwind_special(struct unwind_frame_info *info, unsigned long pc, int frame_size)

{

	void handle_interruption(int, struct pt_regs *);

	static unsigned long *hi = (unsigned long)&handle_interruption;



	if (pc == get_func_addr(hi)) {

		struct pt_regs *regs = (struct pt_regs *)(info->sp - frame_size - PT_SZ_ALGN);

		dbg("Unwinding through handle_interruption()\n");

		info->prev_sp = regs->gr[30];

		info->prev_ip = regs->iaoq[0];



		return 1;

	}



	return 0;

}



static void unwind_frame_regs(struct unwind_frame_info *info)

{

	const struct unwind_table_entry *e;
@@ -312,6 +337,7 @@ static void unwind_frame_regs(struct unwind_frame_info *info) 
			}

		}



		if (!unwind_special(info, e->region_start, frame_size)) {

			info->prev_sp = info->sp - frame_size;

			if (e->Millicode)

				info->rp = info->r31;
@@ -319,6 +345,7 @@ static void unwind_frame_regs(struct unwind_frame_info *info) 
				info->rp = *(unsigned long *)(info->prev_sp - rpoffset);

			info->prev_ip = info->rp;

			info->rp = 0;

		}



		dbg("analyzing func @ %lx, setting prev_sp=%lx "

		    "prev_ip=%lx npc=%lx\n", info->ip, info->prev_sp,