arch/sparc64/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 void save_stack_trace(struct stack_trace *trace)
   9 {
  10         unsigned long ksp, fp, thread_base;
  11         struct thread_info *tp = task_thread_info(current);
  12
  13         stack_trace_flush();
  14
  15         __asm__ __volatile__(
  16                 "mov    %%fp, %0"
  17                 : "=r" (ksp)
  18         );
  19
  20         fp = ksp + STACK_BIAS;
  21         thread_base = (unsigned long) tp;
  22         do {
  23                 struct sparc_stackf *sf;
  24                 struct pt_regs *regs;
  25                 unsigned long pc;
  26
  27                 /* Bogus frame pointer? */
  28                 if (fp < (thread_base + sizeof(struct thread_info)) ||
  29                     fp >= (thread_base + THREAD_SIZE))
  30                         break;
  31
  32                 sf = (struct sparc_stackf *) fp;
  33                 regs = (struct pt_regs *) (sf + 1);
  34
  35                 if ((regs->magic & ~0x1ff) == PT_REGS_MAGIC) {
  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
  48                         trace->entries[trace->nr_entries++] = pc;
  49         } while (trace->nr_entries < trace->max_entries);
  50 }
  51 EXPORT_SYMBOL_GPL(save_stack_trace);