release/src-rt-6.x/linux/linux-2.6/arch/sparc64/kernel/stacktrace.c

   1 #include <linux/sched.h>
   2 #include <linux/stacktrace.h>
   3 #include <linux/thread_info.h>
   4 #include <asm/ptrace.h>
   5
   6 void save_stack_trace(struct stack_trace *trace)
   7 {
   8         unsigned long ksp, fp, thread_base;
   9         struct thread_info *tp = task_thread_info(current);
  10
  11         flushw_all();
  12         __asm__ __volatile__(
  13                 "mov    %%fp, %0"
  14                 : "=r" (ksp)
  15         );
  16
  17         fp = ksp + STACK_BIAS;
  18         thread_base = (unsigned long) tp;
  19         do {
  20                 struct reg_window *rw;
  21
  22                 /* Bogus frame pointer? */
  23                 if (fp < (thread_base + sizeof(struct thread_info)) ||
  24                     fp >= (thread_base + THREAD_SIZE))
  25                         break;
  26
  27                 rw = (struct reg_window *) fp;
  28                 if (trace->skip > 0)
  29                         trace->skip--;
  30                 else
  31                         trace->entries[trace->nr_entries++] = rw->ins[7];
  32
  33                 fp = rw->ins[6] + STACK_BIAS;
  34         } while (trace->nr_entries < trace->max_entries);
  35 }