kernel/2.6.29.6-aldebaran-rt/arch/sparc/kernel/stacktrace.c

   1 #include <linux/sched.h>
   2 #include <linux/stacktrace.h>
   3 #include <linux/thread_info.h>
   4 #include <linux/module.h>
   5 #include <asm/ptrace.h>
   6 #include <asm/stacktrace.h>
   7
   8 #include "kstack.h"
   9
  10 static void __save_stack_trace(struct thread_info *tp,
  11                                struct stack_trace *trace,
  12                                bool skip_sched)
  13 {
  14         unsigned long ksp, fp;
  15
  16         if (tp == current_thread_info()) {
  17                 stack_trace_flush();
  18                 __asm__ __volatile__("mov %%fp, %0" : "=r" (ksp));
  19         } else {
  20                 ksp = tp->ksp;
  21         }
  22
  23         fp = ksp + STACK_BIAS;
  24         do {
  25                 struct sparc_stackf *sf;
  26                 struct pt_regs *regs;
  27                 unsigned long pc;
  28
  29                 if (!kstack_valid(tp, fp))
  30                         break;
  31
  32                 sf = (struct sparc_stackf *) fp;
  33                 regs = (struct pt_regs *) (sf + 1);
  34
  35                 if (kstack_is_trap_frame(tp, regs)) {
  36                         if (!(regs->tstate & TSTATE_PRIV))
  37                                 break;
  38                         pc = regs->tpc;
  39                         fp = regs->u_regs[UREG_I6] + STACK_BIAS;
  40                 } else {
  41                         pc = sf->callers_pc;
  42                         fp = (unsigned long)sf->fp + STACK_BIAS;
  43                 }
  44
  45                 if (trace->skip > 0)
  46                         trace->skip--;
  47                 else if (!skip_sched || !in_sched_functions(pc))
  48                         trace->entries[trace->nr_entries++] = pc;
  49         } while (trace->nr_entries < trace->max_entries);
  50 }
  51
  52 void save_stack_trace(struct stack_trace *trace)
  53 {
  54         __save_stack_trace(current_thread_info(), trace, false);
  55 }
  56 EXPORT_SYMBOL_GPL(save_stack_trace);
  57
  58 void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
  59 {
  60         struct thread_info *tp = task_thread_info(tsk);
  61
  62         __save_stack_trace(tp, trace, true);
  63 }
  64 EXPORT_SYMBOL_GPL(save_stack_trace_tsk);