kprobes-common.h

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#ifndef __X86_KERNEL_KPROBES_COMMON_H
#define __X86_KERNEL_KPROBES_COMMON_H

/* Kprobes and Optprobes common header */

#ifdef CONFIG_X86_64
#define SAVE_REGS_STRING            \
    /* Skip cs, ip, orig_ax. */     \
    "   subq $24, %rsp\n"       \
    "   pushq %rdi\n"           \
    "   pushq %rsi\n"           \
    "   pushq %rdx\n"           \
    "   pushq %rcx\n"           \
    "   pushq %rax\n"           \
    "   pushq %r8\n"            \
    "   pushq %r9\n"            \
    "   pushq %r10\n"           \
    "   pushq %r11\n"           \
    "   pushq %rbx\n"           \
    "   pushq %rbp\n"           \
    "   pushq %r12\n"           \
    "   pushq %r13\n"           \
    "   pushq %r14\n"           \
    "   pushq %r15\n"
#define RESTORE_REGS_STRING         \
    "   popq %r15\n"            \
    "   popq %r14\n"            \
    "   popq %r13\n"            \
    "   popq %r12\n"            \
    "   popq %rbp\n"            \
    "   popq %rbx\n"            \
    "   popq %r11\n"            \
    "   popq %r10\n"            \
    "   popq %r9\n"         \
    "   popq %r8\n"         \
    "   popq %rax\n"            \
    "   popq %rcx\n"            \
    "   popq %rdx\n"            \
    "   popq %rsi\n"            \
    "   popq %rdi\n"            \
    /* Skip orig_ax, ip, cs */      \
    "   addq $24, %rsp\n"
#else
#define SAVE_REGS_STRING            \
    /* Skip cs, ip, orig_ax and gs. */  \
    "   subl $16, %esp\n"       \
    "   pushl %fs\n"            \
    "   pushl %es\n"            \
    "   pushl %ds\n"            \
    "   pushl %eax\n"           \
    "   pushl %ebp\n"           \
    "   pushl %edi\n"           \
    "   pushl %esi\n"           \
    "   pushl %edx\n"           \
    "   pushl %ecx\n"           \
    "   pushl %ebx\n"
#define RESTORE_REGS_STRING         \
    "   popl %ebx\n"            \
    "   popl %ecx\n"            \
    "   popl %edx\n"            \
    "   popl %esi\n"            \
    "   popl %edi\n"            \
    "   popl %ebp\n"            \
    "   popl %eax\n"            \
    /* Skip ds, es, fs, gs, orig_ax, and ip. Note: don't pop cs here*/\
    "   addl $24, %esp\n"
#endif

/* Ensure if the instruction can be boostable */
extern int can_boost(kprobe_opcode_t *instruction);
/* Recover instruction if given address is probed */
extern unsigned long recover_probed_instruction(kprobe_opcode_t *buf,
                     unsigned long addr);
/*
 * Copy an instruction and adjust the displacement if the instruction
 * uses the %rip-relative addressing mode.
 */
extern int __copy_instruction(u8 *dest, u8 *src);

/* Generate a relative-jump/call instruction */
extern void synthesize_reljump(void *from, void *to);
extern void synthesize_relcall(void *from, void *to);

#ifdef  CONFIG_OPTPROBES
extern int arch_init_optprobes(void);
extern int setup_detour_execution(struct kprobe *p, struct pt_regs *regs, int reenter);
extern unsigned long __recover_optprobed_insn(kprobe_opcode_t *buf, unsigned long addr);
#else   /* !CONFIG_OPTPROBES */
static inline int arch_init_optprobes(void)
{
    return 0;
}
static inline int setup_detour_execution(struct kprobe *p, struct pt_regs *regs, int reenter)
{
    return 0;
}
static inline unsigned long __recover_optprobed_insn(kprobe_opcode_t *buf, unsigned long addr)
{
    return addr;
}
#endif
#endif