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stacktrace.c

#include <linux/sched.h>
#include <linux/stacktrace.h>
#include <linux/thread_info.h>
#include <linux/module.h>
#include <asm/ptrace.h>
#include <asm/stacktrace.h>

#include "kstack.h"

void save_stack_trace(struct stack_trace *trace)
{
      struct thread_info *tp = task_thread_info(current);
      unsigned long ksp, fp;

      stack_trace_flush();

      __asm__ __volatile__(
            "mov  %%fp, %0"
            : "=r" (ksp)
      );

      fp = ksp + STACK_BIAS;
      do {
            struct sparc_stackf *sf;
            struct pt_regs *regs;
            unsigned long pc;

            if (!kstack_valid(tp, fp))
                  break;

            sf = (struct sparc_stackf *) fp;
            regs = (struct pt_regs *) (sf + 1);

            if (kstack_is_trap_frame(tp, regs)) {
                  if (!(regs->tstate & TSTATE_PRIV))
                        break;
                  pc = regs->tpc;
                  fp = regs->u_regs[UREG_I6] + STACK_BIAS;
            } else {
                  pc = sf->callers_pc;
                  fp = (unsigned long)sf->fp + STACK_BIAS;
            }

            if (trace->skip > 0)
                  trace->skip--;
            else
                  trace->entries[trace->nr_entries++] = pc;
      } while (trace->nr_entries < trace->max_entries);
}
EXPORT_SYMBOL_GPL(save_stack_trace);

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