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stacktrace.c

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

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

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

      fp = ksp + STACK_BIAS;
      thread_base = (unsigned long) tp;
      do {
            struct reg_window *rw;

            /* Bogus frame pointer? */
            if (fp < (thread_base + sizeof(struct thread_info)) ||
                fp >= (thread_base + THREAD_SIZE))
                  break;

            rw = (struct reg_window *) fp;
            if (trace->skip > 0)
                  trace->skip--;
            else
                  trace->entries[trace->nr_entries++] = rw->ins[7];

            fp = rw->ins[6] + STACK_BIAS;
      } while (trace->nr_entries < trace->max_entries);
}

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