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 #include <asm/stacktrace.h>
   6
   7 void save_stack_trace(struct stack_trace *trace)
   8 {
   9         unsigned long ksp, fp, thread_base;
  10         struct thread_info *tp = task_thread_info(current);
  11
  12         stack_trace_flush();
  13
  14         __asm__ __volatile__(
  15                 "mov    %%fp, %0"
  16                 : "=r" (ksp)
  17         );
  18
  19         fp = ksp + STACK_BIAS;
  20         thread_base = (unsigned long) tp;
  21         do {
  22                 struct sparc_stackf *sf;
  23                 struct pt_regs *regs;
  24                 unsigned long pc;
  25
  26                 /* Bogus frame pointer? */
  27                 if (fp < (thread_base + sizeof(struct thread_info)) ||
  28                     fp > (thread_base + THREAD_SIZE - sizeof(struct sparc_stackf)))
  29                         break;
  30
  31                 sf = (struct sparc_stackf *) fp;
  32                 regs = (struct pt_regs *) (sf + 1);
  33
  34                 if (((unsigned long)regs <=
  35                      (thread_base + THREAD_SIZE - sizeof(*regs))) &&
  36                     (regs->magic & ~0x1ff) == PT_REGS_MAGIC) {
  37                         if (!(regs->tstate & TSTATE_PRIV))
  38                                 break;
  39                         pc = regs->tpc;
  40                         fp = regs->u_regs[UREG_I6] + STACK_BIAS;
  41                 } else {
  42                         pc = sf->callers_pc;
  43                         fp = (unsigned long)sf->fp + STACK_BIAS;
  44                 }
  45
  46                 if (trace->skip > 0)
  47                         trace->skip--;
  48                 else
  49                         trace->entries[trace->nr_entries++] = pc;
  50         } while (trace->nr_entries < trace->max_entries);
  51 }