arch/mips/include/asm/stacktrace.h

   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 extern unsigned long unwind_stack_by_address(unsigned long stack_page,
  11                                              unsigned long *sp,
  12                                              unsigned long pc,
  13                                              unsigned long *ra);
  14 #else
  15 #define raw_show_trace 1
  16 static inline unsigned long unwind_stack(struct task_struct *task,
  17         unsigned long *sp, unsigned long pc, unsigned long *ra)
  18 {
  19         return 0;
  20 }
  21 #endif
  22
  23 static __always_inline void prepare_frametrace(struct pt_regs *regs)
  24 {
  25 #ifndef CONFIG_KALLSYMS
  26         /*
  27          * Remove any garbage that may be in regs (specially func
  28          * addresses) to avoid show_raw_backtrace() to report them
  29          */
  30         memset(regs, 0, sizeof(*regs));
  31 #endif
  32         __asm__ __volatile__(
  33                 ".set push\n\t"
  34                 ".set noat\n\t"
  35 #ifdef CONFIG_64BIT
  36                 "1: dla $1, 1b\n\t"
  37                 "sd $1, %0\n\t"
  38                 "sd $29, %1\n\t"
  39                 "sd $31, %2\n\t"
  40 #else
  41                 "1: la $1, 1b\n\t"
  42                 "sw $1, %0\n\t"
  43                 "sw $29, %1\n\t"
  44                 "sw $31, %2\n\t"
  45 #endif
  46                 ".set pop\n\t"
  47                 : "=m" (regs->cp0_epc),
  48                 "=m" (regs->regs[29]), "=m" (regs->regs[31])
  49                 : : "memory");
  50 }
  51
  52 #endif /* _ASM_STACKTRACE_H */