Commit | Line | Data |
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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); |
94ea09c6 DK |
10 | extern unsigned long unwind_stack_by_address(unsigned long stack_page, |
11 | unsigned long *sp, | |
12 | unsigned long pc, | |
13 | unsigned long *ra); | |
1df0f0ff AN |
14 | #else |
15 | #define raw_show_trace 1 | |
de4b2147 RB |
16 | static inline unsigned long unwind_stack(struct task_struct *task, |
17 | unsigned long *sp, unsigned long pc, unsigned long *ra) | |
18 | { | |
a204458a | 19 | return 0; |
de4b2147 | 20 | } |
1df0f0ff AN |
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 */ |