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Commit fd3e0bbc authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Paul Mackerras
Browse files

[POWERPC] Stacktrace support for lockdep 



This adds stacktrace support for powerpc, which will be needed for
lockdep.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent ec2b36b9

arch/powerpc/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -49,6 +49,10 @@ config IRQ_PER_CPU 
	bool

	default y



config STACKTRACE_SUPPORT

	bool

	default y



config RWSEM_GENERIC_SPINLOCK

	bool

arch/powerpc/kernel/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -67,6 +67,7 @@ obj-$(CONFIG_BOOTX_TEXT) += btext.o 
obj-$(CONFIG_SMP)		+= smp.o

obj-$(CONFIG_KPROBES)		+= kprobes.o

obj-$(CONFIG_PPC_UDBG_16550)	+= legacy_serial.o udbg_16550.o

obj-$(CONFIG_STACKTRACE)	+= stacktrace.o



pci64-$(CONFIG_PPC64)		+= pci_dn.o isa-bridge.o

obj-$(CONFIG_PCI)		+= pci_$(CONFIG_WORD_SIZE).o $(pci64-y) \

arch/powerpc/kernel/stacktrace.c

0 → 100644
+47 −0
Original line number Diff line number Diff line 
/*

 * Stack trace utility

 *

 * Copyright 2008 Christoph Hellwig, IBM Corp.

 *

 *

 *      This program is free software; you can redistribute it and/or

 *      modify it under the terms of the GNU General Public License

 *      as published by the Free Software Foundation; either version

 *      2 of the License, or (at your option) any later version.

 */



#include <linux/sched.h>

#include <linux/stacktrace.h>

#include <asm/ptrace.h>

#include <asm/asm-offsets.h>



/*

 * Save stack-backtrace addresses into a stack_trace buffer.

 */

void save_stack_trace(struct stack_trace *trace)

{

	unsigned long sp;



	asm("mr %0,1" : "=r" (sp));



	for (;;) {

		unsigned long *stack = (unsigned long *) sp;

		unsigned long newsp, ip;



		if (!validate_sp(sp, current, STACK_FRAME_OVERHEAD))

			return;



		newsp = stack[0];

		ip = stack[STACK_FRAME_LR_SAVE];



		if (!trace->skip)

			trace->entries[trace->nr_entries++] = ip;

		else

			trace->skip--;



		if (trace->nr_entries >= trace->max_entries)

			return;



		sp = newsp;

	}

}