From 3f33ab1c0c741bfab2138c14ba1918a7905a1e8b Mon Sep 17 00:00:00 2001 From: Masami Hiramatsu Date: Mon, 5 Mar 2012 22:32:22 +0900 Subject: x86/kprobes: Split out optprobe related code to kprobes-opt.c Split out optprobe related code to arch/x86/kernel/kprobes-opt.c for maintenanceability. Signed-off-by: Masami Hiramatsu Suggested-by: Ingo Molnar Cc: Ananth N Mavinakayanahalli Cc: yrl.pp-manager.tt@hitachi.com Cc: systemtap@sourceware.org Cc: anderson@redhat.com Link: http://lkml.kernel.org/r/20120305133222.5982.54794.stgit@localhost.localdomain [ Tidied up the code a tiny bit ] Signed-off-by: Ingo Molnar --- arch/x86/kernel/kprobes-common.h | 102 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 102 insertions(+) create mode 100644 arch/x86/kernel/kprobes-common.h (limited to 'arch/x86/kernel/kprobes-common.h') diff --git a/arch/x86/kernel/kprobes-common.h b/arch/x86/kernel/kprobes-common.h new file mode 100644 index 0000000..3230b68 --- /dev/null +++ b/arch/x86/kernel/kprobes-common.h @@ -0,0 +1,102 @@ +#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 -- cgit v1.1