1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __X86_KERNEL_KPROBES_COMMON_H
3 #define __X86_KERNEL_KPROBES_COMMON_H
4
5 /* Kprobes and Optprobes common header */
6
7 #include <asm/asm.h>
8 #include <asm/frame.h>
9 #include <asm/insn.h>
10
11 #ifdef CONFIG_X86_64
12
13 #define SAVE_REGS_STRING \
14 /* Skip cs, ip, orig_ax. */ \
15 " subq $24, %rsp\n" \
16 " pushq %rdi\n" \
17 " pushq %rsi\n" \
18 " pushq %rdx\n" \
19 " pushq %rcx\n" \
20 " pushq %rax\n" \
21 " pushq %r8\n" \
22 " pushq %r9\n" \
23 " pushq %r10\n" \
24 " pushq %r11\n" \
25 " pushq %rbx\n" \
26 " pushq %rbp\n" \
27 " pushq %r12\n" \
28 " pushq %r13\n" \
29 " pushq %r14\n" \
30 " pushq %r15\n" \
31 ENCODE_FRAME_POINTER
32
33 #define RESTORE_REGS_STRING \
34 " popq %r15\n" \
35 " popq %r14\n" \
36 " popq %r13\n" \
37 " popq %r12\n" \
38 " popq %rbp\n" \
39 " popq %rbx\n" \
40 " popq %r11\n" \
41 " popq %r10\n" \
42 " popq %r9\n" \
43 " popq %r8\n" \
44 " popq %rax\n" \
45 " popq %rcx\n" \
46 " popq %rdx\n" \
47 " popq %rsi\n" \
48 " popq %rdi\n" \
49 /* Skip orig_ax, ip, cs */ \
50 " addq $24, %rsp\n"
51 #else
52
53 #define SAVE_REGS_STRING \
54 /* Skip cs, ip, orig_ax and gs. */ \
55 " subl $4*4, %esp\n" \
56 " pushl %fs\n" \
57 " pushl %es\n" \
58 " pushl %ds\n" \
59 " pushl %eax\n" \
60 " pushl %ebp\n" \
61 " pushl %edi\n" \
62 " pushl %esi\n" \
63 " pushl %edx\n" \
64 " pushl %ecx\n" \
65 " pushl %ebx\n" \
66 ENCODE_FRAME_POINTER
67
68 #define RESTORE_REGS_STRING \
69 " popl %ebx\n" \
70 " popl %ecx\n" \
71 " popl %edx\n" \
72 " popl %esi\n" \
73 " popl %edi\n" \
74 " popl %ebp\n" \
75 " popl %eax\n" \
76 /* Skip ds, es, fs, gs, orig_ax, ip, and cs. */\
77 " addl $7*4, %esp\n"
78 #endif
79
80 /* Ensure if the instruction can be boostable */
81 extern bool can_boost(struct insn *insn, void *orig_addr);
82 /* Recover instruction if given address is probed */
83 extern unsigned long recover_probed_instruction(kprobe_opcode_t *buf,
84 unsigned long addr);
85 /*
86 * Copy an instruction and adjust the displacement if the instruction
87 * uses the %rip-relative addressing mode.
88 */
89 extern int __copy_instruction(u8 *dest, u8 *src, u8 *real, struct insn *insn);
90
91 /* Generate a relative-jump/call instruction */
92 extern void synthesize_reljump(void *dest, void *from, void *to);
93 extern void synthesize_relcall(void *dest, void *from, void *to);
94
95 #ifdef CONFIG_OPTPROBES
96 extern int setup_detour_execution(struct kprobe *p, struct pt_regs *regs, int reenter);
97 extern unsigned long __recover_optprobed_insn(kprobe_opcode_t *buf, unsigned long addr);
98 #else /* !CONFIG_OPTPROBES */
99 static inline int setup_detour_execution(struct kprobe *p, struct pt_regs *regs, int reenter)
100 {
101 return 0;
102 }
103 static inline unsigned long __recover_optprobed_insn(kprobe_opcode_t *buf, unsigned long addr)
104 {
105 return addr;
106 }
107 #endif
108
109 #endif
110
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