diff options
Diffstat (limited to 'arch/x86/include/asm/kprobes.h')
| -rw-r--r-- | arch/x86/include/asm/kprobes.h | 96 |
1 files changed, 50 insertions, 46 deletions
diff --git a/arch/x86/include/asm/kprobes.h b/arch/x86/include/asm/kprobes.h index 5a6d2873f80e..5939694dfb28 100644 --- a/arch/x86/include/asm/kprobes.h +++ b/arch/x86/include/asm/kprobes.h @@ -1,88 +1,90 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ #ifndef _ASM_X86_KPROBES_H #define _ASM_X86_KPROBES_H /* * Kernel Probes (KProbes) * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. - * * Copyright (C) IBM Corporation, 2002, 2004 * * See arch/x86/kernel/kprobes.c for x86 kprobes history. */ + +#include <asm-generic/kprobes.h> + +#ifdef CONFIG_KPROBES #include <linux/types.h> #include <linux/ptrace.h> #include <linux/percpu.h> +#include <asm/text-patching.h> #include <asm/insn.h> #define __ARCH_WANT_KPROBES_INSN_SLOT -#define ARCH_SUPPORTS_KPROBES_ON_FTRACE struct pt_regs; struct kprobe; typedef u8 kprobe_opcode_t; -#define BREAKPOINT_INSTRUCTION 0xcc -#define RELATIVEJUMP_OPCODE 0xe9 -#define RELATIVEJUMP_SIZE 5 -#define RELATIVECALL_OPCODE 0xe8 -#define RELATIVE_ADDR_SIZE 4 + #define MAX_STACK_SIZE 64 -#define MIN_STACK_SIZE(ADDR) \ - (((MAX_STACK_SIZE) < (((unsigned long)current_thread_info()) + \ - THREAD_SIZE - (unsigned long)(ADDR))) \ - ? (MAX_STACK_SIZE) \ - : (((unsigned long)current_thread_info()) + \ - THREAD_SIZE - (unsigned long)(ADDR))) +#define CUR_STACK_SIZE(ADDR) \ + (current_top_of_stack() - (unsigned long)(ADDR)) +#define MIN_STACK_SIZE(ADDR) \ + (MAX_STACK_SIZE < CUR_STACK_SIZE(ADDR) ? \ + MAX_STACK_SIZE : CUR_STACK_SIZE(ADDR)) #define flush_insn_slot(p) do { } while (0) /* optinsn template addresses */ -extern kprobe_opcode_t optprobe_template_entry; -extern kprobe_opcode_t optprobe_template_val; -extern kprobe_opcode_t optprobe_template_call; -extern kprobe_opcode_t optprobe_template_end; -#define MAX_OPTIMIZED_LENGTH (MAX_INSN_SIZE + RELATIVE_ADDR_SIZE) +extern __visible kprobe_opcode_t optprobe_template_entry[]; +extern __visible kprobe_opcode_t optprobe_template_clac[]; +extern __visible kprobe_opcode_t optprobe_template_val[]; +extern __visible kprobe_opcode_t optprobe_template_call[]; +extern __visible kprobe_opcode_t optprobe_template_end[]; +#define MAX_OPTIMIZED_LENGTH (MAX_INSN_SIZE + DISP32_SIZE) #define MAX_OPTINSN_SIZE \ - (((unsigned long)&optprobe_template_end - \ - (unsigned long)&optprobe_template_entry) + \ - MAX_OPTIMIZED_LENGTH + RELATIVEJUMP_SIZE) + (((unsigned long)optprobe_template_end - \ + (unsigned long)optprobe_template_entry) + \ + MAX_OPTIMIZED_LENGTH + JMP32_INSN_SIZE) extern const int kretprobe_blacklist_size; void arch_remove_kprobe(struct kprobe *p); -void kretprobe_trampoline(void); /* Architecture specific copy of original instruction*/ struct arch_specific_insn { /* copy of the original instruction */ kprobe_opcode_t *insn; /* - * boostable = -1: This instruction type is not boostable. - * boostable = 0: This instruction type is boostable. + * boostable = 0: This instruction type is not boostable. * boostable = 1: This instruction has been boosted: we have * added a relative jump after the instruction copy in insn, * so no single-step and fixup are needed (unless there's - * a post_handler or break_handler). + * a post_handler). */ - int boostable; - bool if_modifier; + unsigned boostable:1; + unsigned char size; /* The size of insn */ + union { + unsigned char opcode; + struct { + unsigned char type; + } jcc; + struct { + unsigned char type; + unsigned char asize; + } loop; + struct { + unsigned char reg; + } indirect; + }; + s32 rel32; /* relative offset must be s32, s16, or s8 */ + void (*emulate_op)(struct kprobe *p, struct pt_regs *regs); + /* Number of bytes of text poked */ + int tp_len; }; struct arch_optimized_insn { /* copy of the original instructions */ - kprobe_opcode_t copied_insn[RELATIVE_ADDR_SIZE]; + kprobe_opcode_t copied_insn[DISP32_SIZE]; /* detour code buffer */ kprobe_opcode_t *insn; /* the size of instructions copied to detour code buffer */ @@ -107,13 +109,15 @@ struct kprobe_ctlblk { unsigned long kprobe_status; unsigned long kprobe_old_flags; unsigned long kprobe_saved_flags; - unsigned long *jprobe_saved_sp; - struct pt_regs jprobe_saved_regs; - kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE]; struct prev_kprobe prev_kprobe; }; extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr); -extern int kprobe_exceptions_notify(struct notifier_block *self, - unsigned long val, void *data); +extern int kprobe_int3_handler(struct pt_regs *regs); + +#else + +static inline int kprobe_debug_handler(struct pt_regs *regs) { return 0; } + +#endif /* CONFIG_KPROBES */ #endif /* _ASM_X86_KPROBES_H */ |