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
unwind_stack(struct task_struct * task,unsigned long * sp,unsigned long pc,unsigned long * ra)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
prepare_frametrace(struct pt_regs * regs)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 */
49