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Commit aa6f4d2b authored by Rabin Vincent's avatar Rabin Vincent Committed by Jesper Nilsson
Browse files

CRIS: add STACKTRACE_SUPPORT 



Add stacktrace support, which is required for lockdep and tracing.  The
stack tracing simply looks at all kernel text symbols found on the
stack, similar to the trap stack dumping code, which can also be
converted to use this.

Signed-off-by: default avatarRabin Vincent <rabin@rab.in>
Signed-off-by: default avatarJesper Nilsson <jesper.nilsson@axis.com>
parent 3fffa23e

arch/cris/Kconfig

+3 −0
Original line number Diff line number Diff line
@@ -40,6 +40,9 @@ config TRACE_IRQFLAGS_SUPPORT 
	depends on ETRAX_ARCH_V32

	def_bool y



config STACKTRACE_SUPPORT

	def_bool y



config CRIS

	bool

	default y

arch/cris/include/asm/stacktrace.h

0 → 100644
+8 −0
Original line number Diff line number Diff line 
#ifndef __CRIS_STACKTRACE_H

#define __CRIS_STACKTRACE_H



void walk_stackframe(unsigned long sp,

		     int (*fn)(unsigned long addr, void *data),

		     void *data);



#endif

arch/cris/kernel/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ extra-y := vmlinux.lds 


obj-y   := process.o traps.o irq.o ptrace.o setup.o time.o sys_cris.o

obj-y += devicetree.o

obj-y += stacktrace.o



obj-$(CONFIG_MODULES)    += crisksyms.o

obj-$(CONFIG_MODULES)	 += module.o

arch/cris/kernel/stacktrace.c

0 → 100644
+76 −0
Original line number Diff line number Diff line 
#include <linux/sched.h>

#include <linux/stacktrace.h>

#include <linux/stacktrace.h>

#include <asm/stacktrace.h>



void walk_stackframe(unsigned long sp,

		     int (*fn)(unsigned long addr, void *data),

		     void *data)

{

	unsigned long high = ALIGN(sp, THREAD_SIZE);



	for (; sp <= high - 4; sp += 4) {

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



		if (!kernel_text_address(addr))

			continue;



		if (fn(addr, data))

			break;

	}

}



struct stack_trace_data {

	struct stack_trace *trace;

	unsigned int no_sched_functions;

	unsigned int skip;

};



#ifdef CONFIG_STACKTRACE



static int save_trace(unsigned long addr, void *d)

{

	struct stack_trace_data *data = d;

	struct stack_trace *trace = data->trace;



	if (data->no_sched_functions && in_sched_functions(addr))

		return 0;



	if (data->skip) {

		data->skip--;

		return 0;

	}



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



	return trace->nr_entries >= trace->max_entries;

}



void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)

{

	struct stack_trace_data data;

	unsigned long sp;



	data.trace = trace;

	data.skip = trace->skip;



	if (tsk != current) {

		data.no_sched_functions = 1;

		sp = tsk->thread.ksp;

	} else {

		data.no_sched_functions = 0;

		sp = rdsp();

	}



	walk_stackframe(sp, save_trace, &data);

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

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

}



void save_stack_trace(struct stack_trace *trace)

{

	save_stack_trace_tsk(current, trace);

}

EXPORT_SYMBOL_GPL(save_stack_trace);



#endif /* CONFIG_STACKTRACE */