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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1#ifndef _ASM_X86_FTRACE_H
2#define _ASM_X86_FTRACE_H
3
4#ifdef __ASSEMBLY__
5
6 .macro MCOUNT_SAVE_FRAME
7 /* taken from glibc */
8 subq $0x38, %rsp
9 movq %rax, (%rsp)
10 movq %rcx, 8(%rsp)
11 movq %rdx, 16(%rsp)
12 movq %rsi, 24(%rsp)
13 movq %rdi, 32(%rsp)
14 movq %r8, 40(%rsp)
15 movq %r9, 48(%rsp)
16 .endm
17
18 .macro MCOUNT_RESTORE_FRAME
19 movq 48(%rsp), %r9
20 movq 40(%rsp), %r8
21 movq 32(%rsp), %rdi
22 movq 24(%rsp), %rsi
23 movq 16(%rsp), %rdx
24 movq 8(%rsp), %rcx
25 movq (%rsp), %rax
26 addq $0x38, %rsp
27 .endm
28
29#endif
30
31#ifdef CONFIG_FUNCTION_TRACER
32#define MCOUNT_ADDR ((long)(mcount))
33#define MCOUNT_INSN_SIZE 5 /* sizeof mcount call */
34
35#ifndef __ASSEMBLY__
36extern void mcount(void);
37
38static inline unsigned long ftrace_call_adjust(unsigned long addr)
39{
40 /*
41 * call mcount is "e8 <4 byte offset>"
42 * The addr points to the 4 byte offset and the caller of this
43 * function wants the pointer to e8. Simply subtract one.
44 */
45 return addr - 1;
46}
47
48#ifdef CONFIG_DYNAMIC_FTRACE
49
50struct dyn_arch_ftrace {
51 /* No extra data needed for x86 */
52};
53
54#endif /* CONFIG_DYNAMIC_FTRACE */
55#endif /* __ASSEMBLY__ */
56#endif /* CONFIG_FUNCTION_TRACER */
57
58#endif /* _ASM_X86_FTRACE_H */