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   1 #ifndef _ASM_STACKTRACE_H
   2 #define _ASM_STACKTRACE_H
   3
   4 #include <asm/ptrace.h>
   5
   6 #ifdef CONFIG_KALLSYMS
   7 extern int raw_show_trace;
   8 extern unsigned long unwind_stack(struct task_struct *task, unsigned long *sp,
   9                                   unsigned long pc, unsigned long *ra);
  10 #else
  11 #define raw_show_trace 1
  12 static inline unsigned long unwind_stack(struct task_struct *task,
  13         unsigned long *sp, unsigned long pc, unsigned long *ra)
  14 {
  15         return 0;
  16 }
  17 #endif
  18
  19 static __always_inline void prepare_frametrace(struct pt_regs *regs)
  20 {
  21 #ifndef CONFIG_KALLSYMS
  22         /*
  23          * Remove any garbage that may be in regs (specially func
  24          * addresses) to avoid show_raw_backtrace() to report them
  25          */
  26         memset(regs, 0, sizeof(*regs));
  27 #endif
  28         __asm__ __volatile__(
  29                 ".set push\n\t"
  30                 ".set noat\n\t"
  31 #ifdef CONFIG_64BIT
  32                 "1: dla $1, 1b\n\t"
  33                 "sd $1, %0\n\t"
  34                 "sd $29, %1\n\t"
  35                 "sd $31, %2\n\t"
  36 #else
  37                 "1: la $1, 1b\n\t"
  38                 "sw $1, %0\n\t"
  39                 "sw $29, %1\n\t"
  40                 "sw $31, %2\n\t"
  41 #endif
  42                 ".set pop\n\t"
  43                 : "=m" (regs->cp0_epc),
  44                 "=m" (regs->regs[29]), "=m" (regs->regs[31])
  45                 : : "memory");
  46 }
  47
  48 #endif /* _ASM_STACKTRACE_H */