write in 30M

hc

2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc

 kernel/arch/x86/include/asm/kprobes.h
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@@ -1,21 +1,8 @@
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+/* 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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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License as published by
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- * the Free Software Foundation; either version 2 of the License, or
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- * (at your option) any later version.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, write to the Free Software
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- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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  *
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  * Copyright (C) IBM Corporation, 2002, 2004
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  *
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@@ -24,12 +11,11 @@
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11
 
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 #include <asm-generic/kprobes.h>
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-#define BREAKPOINT_INSTRUCTION	0xcc
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-
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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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@@ -38,10 +24,7 @@
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 struct kprobe;
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 typedef u8 kprobe_opcode_t;
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-#define RELATIVEJUMP_OPCODE 0xe9
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-#define RELATIVEJUMP_SIZE 5
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-#define RELATIVECALL_OPCODE 0xe8
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-#define RELATIVE_ADDR_SIZE 4
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+
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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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@@ -53,14 +36,15 @@
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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 + RELATIVE_ADDR_SIZE)
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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 + RELATIVEJUMP_SIZE)
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+	 MAX_OPTIMIZED_LENGTH + JMP32_INSN_SIZE)
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 extern const int kretprobe_blacklist_size;
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@@ -74,19 +58,36 @@
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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 = false: This instruction type is not boostable.
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-	 * boostable = true: This instruction has been boosted: we have
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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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-	bool boostable;
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-	bool if_modifier;
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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[RELATIVE_ADDR_SIZE];
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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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@@ -118,7 +119,10 @@
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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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-extern int kprobe_debug_handler(struct pt_regs *regs);
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+
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+#else
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+
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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 */