Commit d0f4c16f authored by Andreas Krebbel's avatar Andreas Krebbel Committed by Linus Torvalds
Browse files

[PATCH] s390: add oprofile callgraph support 



Signed-off-by: default avatarAndreas Krebbel <krebbel1@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 1c01b8a5

arch/s390/oprofile/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -6,4 +6,4 @@ DRIVER_OBJS = $(addprefix ../../../drivers/oprofile/, \ 
		oprofilefs.o oprofile_stats.o  \

		timer_int.o )



oprofile-y				:= $(DRIVER_OBJS) init.o
 
oprofile-y				:= $(DRIVER_OBJS) init.o backtrace.o

arch/s390/oprofile/backtrace.c

0 → 100644
+79 −0
Original line number Diff line number Diff line 
/**

 * arch/s390/oprofile/backtrace.c

 *

 * S390 Version

 *   Copyright (C) 2005 IBM Corporation, IBM Deutschland Entwicklung GmbH.

 *   Author(s): Andreas Krebbel <Andreas.Krebbel@de.ibm.com>

 */



#include <linux/oprofile.h>



#include <asm/processor.h> /* for struct stack_frame */



static unsigned long

__show_trace(unsigned int *depth, unsigned long sp,

	     unsigned long low, unsigned long high)

{

	struct stack_frame *sf;

	struct pt_regs *regs;



	while (*depth) {

		sp = sp & PSW_ADDR_INSN;

		if (sp < low || sp > high - sizeof(*sf))

			return sp;

		sf = (struct stack_frame *) sp;

		(*depth)--;

		oprofile_add_trace(sf->gprs[8] & PSW_ADDR_INSN);



		/* Follow the backchain.  */

		while (*depth) {

			low = sp;

			sp = sf->back_chain & PSW_ADDR_INSN;

			if (!sp)

				break;

			if (sp <= low || sp > high - sizeof(*sf))

				return sp;

			sf = (struct stack_frame *) sp;

			(*depth)--;

			oprofile_add_trace(sf->gprs[8] & PSW_ADDR_INSN);



		}



		if (*depth == 0)

			break;



		/* Zero backchain detected, check for interrupt frame.  */

		sp = (unsigned long) (sf + 1);

		if (sp <= low || sp > high - sizeof(*regs))

			return sp;

		regs = (struct pt_regs *) sp;

		(*depth)--;

		oprofile_add_trace(sf->gprs[8] & PSW_ADDR_INSN);

		low = sp;

		sp = regs->gprs[15];

	}

	return sp;

}



void s390_backtrace(struct pt_regs * const regs, unsigned int depth)

{

	unsigned long head;

	struct stack_frame* head_sf;



	if (user_mode (regs))

		return;



	head = regs->gprs[15];

	head_sf = (struct stack_frame*)head;



	if (!head_sf->back_chain)

		return;



	head = head_sf->back_chain;



	head = __show_trace(&depth, head, S390_lowcore.async_stack - ASYNC_SIZE,

			    S390_lowcore.async_stack);



	__show_trace(&depth, head, S390_lowcore.thread_info,

		     S390_lowcore.thread_info + THREAD_SIZE);

}

arch/s390/oprofile/init.c

+4 −0
Original line number Diff line number Diff line
@@ -12,8 +12,12 @@ 
#include <linux/init.h>

#include <linux/errno.h>





extern void s390_backtrace(struct pt_regs * const regs, unsigned int depth);



int __init oprofile_arch_init(struct oprofile_operations* ops)

{

	ops->backtrace = s390_backtrace;

	return -ENODEV;

}