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1df0f0ff AN |
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, | |
1924600c | 9 | unsigned long pc, unsigned long *ra); |
1df0f0ff AN |
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 */ |