/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef _ASM_X86_KPROBES_H
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#define _ASM_X86_KPROBES_H
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/*
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* Kernel Probes (KProbes)
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*
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* Copyright (C) IBM Corporation, 2002, 2004
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*
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* See arch/x86/kernel/kprobes.c for x86 kprobes history.
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*/
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#include <asm-generic/kprobes.h>
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#ifdef CONFIG_KPROBES
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#include <linux/types.h>
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#include <linux/ptrace.h>
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#include <linux/percpu.h>
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#include <asm/text-patching.h>
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#include <asm/insn.h>
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#define __ARCH_WANT_KPROBES_INSN_SLOT
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struct pt_regs;
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struct kprobe;
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typedef u8 kprobe_opcode_t;
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#define MAX_STACK_SIZE 64
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#define CUR_STACK_SIZE(ADDR) \
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(current_top_of_stack() - (unsigned long)(ADDR))
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#define MIN_STACK_SIZE(ADDR) \
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(MAX_STACK_SIZE < CUR_STACK_SIZE(ADDR) ? \
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MAX_STACK_SIZE : CUR_STACK_SIZE(ADDR))
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#define flush_insn_slot(p) do { } while (0)
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/* optinsn template addresses */
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extern __visible kprobe_opcode_t optprobe_template_entry[];
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extern __visible kprobe_opcode_t optprobe_template_clac[];
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extern __visible kprobe_opcode_t optprobe_template_val[];
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extern __visible kprobe_opcode_t optprobe_template_call[];
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extern __visible kprobe_opcode_t optprobe_template_end[];
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#define MAX_OPTIMIZED_LENGTH (MAX_INSN_SIZE + DISP32_SIZE)
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#define MAX_OPTINSN_SIZE \
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(((unsigned long)optprobe_template_end - \
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(unsigned long)optprobe_template_entry) + \
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MAX_OPTIMIZED_LENGTH + JMP32_INSN_SIZE)
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extern const int kretprobe_blacklist_size;
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void arch_remove_kprobe(struct kprobe *p);
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asmlinkage void kretprobe_trampoline(void);
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extern void arch_kprobe_override_function(struct pt_regs *regs);
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/* Architecture specific copy of original instruction*/
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struct arch_specific_insn {
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/* copy of the original instruction */
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kprobe_opcode_t *insn;
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/*
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* boostable = 0: This instruction type is not boostable.
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* boostable = 1: This instruction has been boosted: we have
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* added a relative jump after the instruction copy in insn,
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* so no single-step and fixup are needed (unless there's
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* a post_handler).
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*/
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unsigned boostable:1;
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unsigned char size; /* The size of insn */
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union {
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unsigned char opcode;
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struct {
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unsigned char type;
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} jcc;
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struct {
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unsigned char type;
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unsigned char asize;
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} loop;
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struct {
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unsigned char reg;
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} indirect;
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};
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s32 rel32; /* relative offset must be s32, s16, or s8 */
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void (*emulate_op)(struct kprobe *p, struct pt_regs *regs);
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/* Number of bytes of text poked */
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int tp_len;
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};
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struct arch_optimized_insn {
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/* copy of the original instructions */
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kprobe_opcode_t copied_insn[DISP32_SIZE];
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/* detour code buffer */
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kprobe_opcode_t *insn;
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/* the size of instructions copied to detour code buffer */
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size_t size;
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};
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/* Return true (!0) if optinsn is prepared for optimization. */
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static inline int arch_prepared_optinsn(struct arch_optimized_insn *optinsn)
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{
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return optinsn->size;
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}
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struct prev_kprobe {
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struct kprobe *kp;
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unsigned long status;
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unsigned long old_flags;
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unsigned long saved_flags;
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};
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/* per-cpu kprobe control block */
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struct kprobe_ctlblk {
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unsigned long kprobe_status;
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unsigned long kprobe_old_flags;
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unsigned long kprobe_saved_flags;
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struct prev_kprobe prev_kprobe;
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};
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extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
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extern int kprobe_exceptions_notify(struct notifier_block *self,
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unsigned long val, void *data);
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extern int kprobe_int3_handler(struct pt_regs *regs);
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#else
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static inline int kprobe_debug_handler(struct pt_regs *regs) { return 0; }
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#endif /* CONFIG_KPROBES */
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#endif /* _ASM_X86_KPROBES_H */
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