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, struct task_struct *task)
   7 {
   8         unsigned long ksp, fp, thread_base;
   9         struct thread_info *tp;
  10
  11         if (!task)
  12                 task = current;
  13         tp = task_thread_info(task);
  14         if (task == current) {
  15                 flushw_all();
  16                 __asm__ __volatile__(
  17                         "mov    %%fp, %0"
  18                         : "=r" (ksp)
  19                 );
  20         } else
  21                 ksp = tp->ksp;
  22
  23         fp = ksp + STACK_BIAS;
  24         thread_base = (unsigned long) tp;
  25         do {
  26                 struct reg_window *rw;
  27
  28                 /* Bogus frame pointer? */
  29                 if (fp < (thread_base + sizeof(struct thread_info)) ||
  30                     fp >= (thread_base + THREAD_SIZE))
  31                         break;
  32
  33                 rw = (struct reg_window *) fp;
  34                 if (trace->skip > 0)
  35                         trace->skip--;
  36                 else
  37                         trace->entries[trace->nr_entries++] = rw->ins[7];
  38
  39                 fp = rw->ins[6] + STACK_BIAS;
  40         } while (trace->nr_entries < trace->max_entries);
  41 }