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