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