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ftrace.h
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1 #ifndef _ASM_X86_FTRACE_H
2 #define _ASM_X86_FTRACE_H
3 
4 #ifdef __ASSEMBLY__
5 
6  /* skip is set if the stack was already partially adjusted */
7  .macro MCOUNT_SAVE_FRAME skip=0
8  /*
9  * We add enough stack to save all regs.
10  */
11  subq $(SS+8-\skip), %rsp
12  movq %rax, RAX(%rsp)
13  movq %rcx, RCX(%rsp)
14  movq %rdx, RDX(%rsp)
15  movq %rsi, RSI(%rsp)
16  movq %rdi, RDI(%rsp)
17  movq %r8, R8(%rsp)
18  movq %r9, R9(%rsp)
19  /* Move RIP to its proper location */
20  movq SS+8(%rsp), %rdx
21  movq %rdx, RIP(%rsp)
22  .endm
23 
24  .macro MCOUNT_RESTORE_FRAME skip=0
25  movq R9(%rsp), %r9
26  movq R8(%rsp), %r8
27  movq RDI(%rsp), %rdi
28  movq RSI(%rsp), %rsi
29  movq RDX(%rsp), %rdx
30  movq RCX(%rsp), %rcx
31  movq RAX(%rsp), %rax
32  addq $(SS+8-\skip), %rsp
33  .endm
34 
35 #endif
36 
37 #ifdef CONFIG_FUNCTION_TRACER
38 #ifdef CC_USING_FENTRY
39 # define MCOUNT_ADDR ((long)(__fentry__))
40 #else
41 # define MCOUNT_ADDR ((long)(mcount))
42 #endif
43 #define MCOUNT_INSN_SIZE 5 /* sizeof mcount call */
44 
45 #ifdef CONFIG_DYNAMIC_FTRACE
46 #define ARCH_SUPPORTS_FTRACE_OPS 1
47 #define ARCH_SUPPORTS_FTRACE_SAVE_REGS
48 #endif
49 
50 #ifndef __ASSEMBLY__
51 extern void mcount(void);
52 extern atomic_t modifying_ftrace_code;
53 extern void __fentry__(void);
54 
55 static inline unsigned long ftrace_call_adjust(unsigned long addr)
56 {
57  /*
58  * addr is the address of the mcount call instruction.
59  * recordmcount does the necessary offset calculation.
60  */
61  return addr;
62 }
63 
64 #ifdef CONFIG_DYNAMIC_FTRACE
65 
66 struct dyn_arch_ftrace {
67  /* No extra data needed for x86 */
68 };
69 
70 int ftrace_int3_handler(struct pt_regs *regs);
71 
72 #endif /* CONFIG_DYNAMIC_FTRACE */
73 #endif /* __ASSEMBLY__ */
74 #endif /* CONFIG_FUNCTION_TRACER */
75 
76 #endif /* _ASM_X86_FTRACE_H */