arch/x86/kernel/kprobes/common.h

   1 #ifndef __X86_KERNEL_KPROBES_COMMON_H
   2 #define __X86_KERNEL_KPROBES_COMMON_H
   3
   4 /* Kprobes and Optprobes common header */
   5
   6 #ifdef CONFIG_X86_64
   7 #define SAVE_REGS_STRING                        \
   8         /* Skip cs, ip, orig_ax. */             \
   9         "       subq $24, %rsp\n"               \
  10         "       pushq %rdi\n"                   \
  11         "       pushq %rsi\n"                   \
  12         "       pushq %rdx\n"                   \
  13         "       pushq %rcx\n"                   \
  14         "       pushq %rax\n"                   \
  15         "       pushq %r8\n"                    \
  16         "       pushq %r9\n"                    \
  17         "       pushq %r10\n"                   \
  18         "       pushq %r11\n"                   \
  19         "       pushq %rbx\n"                   \
  20         "       pushq %rbp\n"                   \
  21         "       pushq %r12\n"                   \
  22         "       pushq %r13\n"                   \
  23         "       pushq %r14\n"                   \
  24         "       pushq %r15\n"
  25 #define RESTORE_REGS_STRING                     \
  26         "       popq %r15\n"                    \
  27         "       popq %r14\n"                    \
  28         "       popq %r13\n"                    \
  29         "       popq %r12\n"                    \
  30         "       popq %rbp\n"                    \
  31         "       popq %rbx\n"                    \
  32         "       popq %r11\n"                    \
  33         "       popq %r10\n"                    \
  34         "       popq %r9\n"                     \
  35         "       popq %r8\n"                     \
  36         "       popq %rax\n"                    \
  37         "       popq %rcx\n"                    \
  38         "       popq %rdx\n"                    \
  39         "       popq %rsi\n"                    \
  40         "       popq %rdi\n"                    \
  41         /* Skip orig_ax, ip, cs */              \
  42         "       addq $24, %rsp\n"
  43 #else
  44 #define SAVE_REGS_STRING                        \
  45         /* Skip cs, ip, orig_ax and gs. */      \
  46         "       subl $16, %esp\n"               \
  47         "       pushl %fs\n"                    \
  48         "       pushl %es\n"                    \
  49         "       pushl %ds\n"                    \
  50         "       pushl %eax\n"                   \
  51         "       pushl %ebp\n"                   \
  52         "       pushl %edi\n"                   \
  53         "       pushl %esi\n"                   \
  54         "       pushl %edx\n"                   \
  55         "       pushl %ecx\n"                   \
  56         "       pushl %ebx\n"
  57 #define RESTORE_REGS_STRING                     \
  58         "       popl %ebx\n"                    \
  59         "       popl %ecx\n"                    \
  60         "       popl %edx\n"                    \
  61         "       popl %esi\n"                    \
  62         "       popl %edi\n"                    \
  63         "       popl %ebp\n"                    \
  64         "       popl %eax\n"                    \
  65         /* Skip ds, es, fs, gs, orig_ax, and ip. Note: don't pop cs here*/\
  66         "       addl $24, %esp\n"
  67 #endif
  68
  69 /* Ensure if the instruction can be boostable */
  70 extern int can_boost(kprobe_opcode_t *instruction);
  71 /* Recover instruction if given address is probed */
  72 extern unsigned long recover_probed_instruction(kprobe_opcode_t *buf,
  73                                          unsigned long addr);
  74 /*
  75  * Copy an instruction and adjust the displacement if the instruction
  76  * uses the %rip-relative addressing mode.
  77  */
  78 extern int __copy_instruction(u8 *dest, u8 *src);
  79
  80 /* Generate a relative-jump/call instruction */
  81 extern void synthesize_reljump(void *from, void *to);
  82 extern void synthesize_relcall(void *from, void *to);
  83
  84 #ifdef  CONFIG_OPTPROBES
  85 extern int setup_detour_execution(struct kprobe *p, struct pt_regs *regs, int reenter);
  86 extern unsigned long __recover_optprobed_insn(kprobe_opcode_t *buf, unsigned long addr);
  87 #else   /* !CONFIG_OPTPROBES */
  88 static inline int setup_detour_execution(struct kprobe *p, struct pt_regs *regs, int reenter)
  89 {
  90         return 0;
  91 }
  92 static inline unsigned long __recover_optprobed_insn(kprobe_opcode_t *buf, unsigned long addr)
  93 {
  94         return addr;
  95 }
  96 #endif
  97
  98 #ifdef CONFIG_KPROBES_ON_FTRACE
  99 extern int skip_singlestep(struct kprobe *p, struct pt_regs *regs,
 100                            struct kprobe_ctlblk *kcb);
 101 #else
 102 static inline int skip_singlestep(struct kprobe *p, struct pt_regs *regs,
 103                                   struct kprobe_ctlblk *kcb)
 104 {
 105         return 0;
 106 }
 107 #endif
 108 #endif