Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
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linux
1#ifndef _ASM_STACKTRACE_H
2#define _ASM_STACKTRACE_H
3
4#include <asm/ptrace.h>
5#include <asm/asm.h>
6#include <linux/stringify.h>
7
8#ifdef CONFIG_KALLSYMS
9extern int raw_show_trace;
10extern unsigned long unwind_stack(struct task_struct *task, unsigned long *sp,
11 unsigned long pc, unsigned long *ra);
12extern unsigned long unwind_stack_by_address(unsigned long stack_page,
13 unsigned long *sp,
14 unsigned long pc,
15 unsigned long *ra);
16#else
17#define raw_show_trace 1
18static inline unsigned long unwind_stack(struct task_struct *task,
19 unsigned long *sp, unsigned long pc, unsigned long *ra)
20{
21 return 0;
22}
23#endif
24
25#define STR_PTR_LA __stringify(PTR_LA)
26#define STR_LONG_S __stringify(LONG_S)
27#define STR_LONG_L __stringify(LONG_L)
28#define STR_LONGSIZE __stringify(LONGSIZE)
29
30#define STORE_ONE_REG(r) \
31 STR_LONG_S " $" __stringify(r)",("STR_LONGSIZE"*"__stringify(r)")(%1)\n\t"
32
33static __always_inline void prepare_frametrace(struct pt_regs *regs)
34{
35#ifndef CONFIG_KALLSYMS
36 /*
37 * Remove any garbage that may be in regs (specially func
38 * addresses) to avoid show_raw_backtrace() to report them
39 */
40 memset(regs, 0, sizeof(*regs));
41#endif
42 __asm__ __volatile__(
43 ".set push\n\t"
44 ".set noat\n\t"
45 /* Store $1 so we can use it */
46 STR_LONG_S " $1,"STR_LONGSIZE"(%1)\n\t"
47 /* Store the PC */
48 "1: " STR_PTR_LA " $1, 1b\n\t"
49 STR_LONG_S " $1,%0\n\t"
50 STORE_ONE_REG(2)
51 STORE_ONE_REG(3)
52 STORE_ONE_REG(4)
53 STORE_ONE_REG(5)
54 STORE_ONE_REG(6)
55 STORE_ONE_REG(7)
56 STORE_ONE_REG(8)
57 STORE_ONE_REG(9)
58 STORE_ONE_REG(10)
59 STORE_ONE_REG(11)
60 STORE_ONE_REG(12)
61 STORE_ONE_REG(13)
62 STORE_ONE_REG(14)
63 STORE_ONE_REG(15)
64 STORE_ONE_REG(16)
65 STORE_ONE_REG(17)
66 STORE_ONE_REG(18)
67 STORE_ONE_REG(19)
68 STORE_ONE_REG(20)
69 STORE_ONE_REG(21)
70 STORE_ONE_REG(22)
71 STORE_ONE_REG(23)
72 STORE_ONE_REG(24)
73 STORE_ONE_REG(25)
74 STORE_ONE_REG(26)
75 STORE_ONE_REG(27)
76 STORE_ONE_REG(28)
77 STORE_ONE_REG(29)
78 STORE_ONE_REG(30)
79 STORE_ONE_REG(31)
80 /* Restore $1 */
81 STR_LONG_L " $1,"STR_LONGSIZE"(%1)\n\t"
82 ".set pop\n\t"
83 : "=m" (regs->cp0_epc)
84 : "r" (regs->regs)
85 : "memory");
86}
87
88#endif /* _ASM_STACKTRACE_H */