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 #include <asm/asm.h>
   7
   8 #ifdef CONFIG_FRAME_POINTER
   9 # define SAVE_RBP_STRING "      push %" _ASM_BP "\n" \
  10                          "      mov  %" _ASM_SP ", %" _ASM_BP "\n"
  11 #else
  12 # define SAVE_RBP_STRING "      push %" _ASM_BP "\n"
  13 #endif
  14
  15 #ifdef CONFIG_X86_64
  16 #define SAVE_REGS_STRING                        \
  17         /* Skip cs, ip, orig_ax. */             \
  18         "       subq $24, %rsp\n"               \
  19         "       pushq %rdi\n"                   \
  20         "       pushq %rsi\n"                   \
  21         "       pushq %rdx\n"                   \
  22         "       pushq %rcx\n"                   \
  23         "       pushq %rax\n"                   \
  24         "       pushq %r8\n"                    \
  25         "       pushq %r9\n"                    \
  26         "       pushq %r10\n"                   \
  27         "       pushq %r11\n"                   \
  28         "       pushq %rbx\n"                   \
  29         SAVE_RBP_STRING                         \
  30         "       pushq %r12\n"                   \
  31         "       pushq %r13\n"                   \
  32         "       pushq %r14\n"                   \
  33         "       pushq %r15\n"
  34 #define RESTORE_REGS_STRING                     \
  35         "       popq %r15\n"                    \
  36         "       popq %r14\n"                    \
  37         "       popq %r13\n"                    \
  38         "       popq %r12\n"                    \
  39         "       popq %rbp\n"                    \
  40         "       popq %rbx\n"                    \
  41         "       popq %r11\n"                    \
  42         "       popq %r10\n"                    \
  43         "       popq %r9\n"                     \
  44         "       popq %r8\n"                     \
  45         "       popq %rax\n"                    \
  46         "       popq %rcx\n"                    \
  47         "       popq %rdx\n"                    \
  48         "       popq %rsi\n"                    \
  49         "       popq %rdi\n"                    \
  50         /* Skip orig_ax, ip, cs */              \
  51         "       addq $24, %rsp\n"
  52 #else
  53 #define SAVE_REGS_STRING                        \
  54         /* Skip cs, ip, orig_ax and gs. */      \
  55         "       subl $16, %esp\n"               \
  56         "       pushl %fs\n"                    \
  57         "       pushl %es\n"                    \
  58         "       pushl %ds\n"                    \
  59         "       pushl %eax\n"                   \
  60         SAVE_RBP_STRING                         \
  61         "       pushl %edi\n"                   \
  62         "       pushl %esi\n"                   \
  63         "       pushl %edx\n"                   \
  64         "       pushl %ecx\n"                   \
  65         "       pushl %ebx\n"
  66 #define RESTORE_REGS_STRING                     \
  67         "       popl %ebx\n"                    \
  68         "       popl %ecx\n"                    \
  69         "       popl %edx\n"                    \
  70         "       popl %esi\n"                    \
  71         "       popl %edi\n"                    \
  72         "       popl %ebp\n"                    \
  73         "       popl %eax\n"                    \
  74         /* Skip ds, es, fs, gs, orig_ax, and ip. Note: don't pop cs here*/\
  75         "       addl $24, %esp\n"
  76 #endif
  77
  78 /* Ensure if the instruction can be boostable */
  79 extern int can_boost(struct insn *insn, void *orig_addr);
  80 /* Recover instruction if given address is probed */
  81 extern unsigned long recover_probed_instruction(kprobe_opcode_t *buf,
  82                                          unsigned long addr);
  83 /*
  84  * Copy an instruction and adjust the displacement if the instruction
  85  * uses the %rip-relative addressing mode.
  86  */
  87 extern int __copy_instruction(u8 *dest, u8 *src, struct insn *insn);
  88
  89 /* Generate a relative-jump/call instruction */
  90 extern void synthesize_reljump(void *from, void *to);
  91 extern void synthesize_relcall(void *from, void *to);
  92
  93 #ifdef  CONFIG_OPTPROBES
  94 extern int setup_detour_execution(struct kprobe *p, struct pt_regs *regs, int reenter);
  95 extern unsigned long __recover_optprobed_insn(kprobe_opcode_t *buf, unsigned long addr);
  96 #else   /* !CONFIG_OPTPROBES */
  97 static inline int setup_detour_execution(struct kprobe *p, struct pt_regs *regs, int reenter)
  98 {
  99         return 0;
 100 }
 101 static inline unsigned long __recover_optprobed_insn(kprobe_opcode_t *buf, unsigned long addr)
 102 {
 103         return addr;
 104 }
 105 #endif
 106
 107 #ifdef CONFIG_KPROBES_ON_FTRACE
 108 extern int skip_singlestep(struct kprobe *p, struct pt_regs *regs,
 109                            struct kprobe_ctlblk *kcb);
 110 #else
 111 static inline int skip_singlestep(struct kprobe *p, struct pt_regs *regs,
 112                                   struct kprobe_ctlblk *kcb)
 113 {
 114         return 0;
 115 }
 116 #endif
 117 #endif