1#ifndef _ASM_STACKTRACE_H
2#define _ASM_STACKTRACE_H
3
4#include <asm/ptrace.h>
5
6#ifdef CONFIG_KALLSYMS
7extern int raw_show_trace;
8extern 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
15static __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 */
45