Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
12static 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
19static __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 */