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/**

 * 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);

}