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backtrace.c

/**
 * 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);
}

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