mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 05:34:00 +08:00
b4da3340ea
Check whether error injectable event is on function entry or not. Currently it checks the event is ftrace-based kprobes or not, but that is wrong. It should check if the event is on the entry of target function. Since error injection will override a function to just return with modified return value, that operation must be done before the target function starts making stackframe. As a side effect, bpf error injection is no need to depend on function-tracer. It can work with sw-breakpoint based kprobe events too. Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Reviewed-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
128 lines
3.9 KiB
C
128 lines
3.9 KiB
C
#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>
|
|
|
|
#define BREAKPOINT_INSTRUCTION 0xcc
|
|
|
|
#ifdef CONFIG_KPROBES
|
|
#include <linux/types.h>
|
|
#include <linux/ptrace.h>
|
|
#include <linux/percpu.h>
|
|
#include <asm/insn.h>
|
|
|
|
#define __ARCH_WANT_KPROBES_INSN_SLOT
|
|
|
|
struct pt_regs;
|
|
struct kprobe;
|
|
|
|
typedef u8 kprobe_opcode_t;
|
|
#define RELATIVEJUMP_OPCODE 0xe9
|
|
#define RELATIVEJUMP_SIZE 5
|
|
#define RELATIVECALL_OPCODE 0xe8
|
|
#define RELATIVE_ADDR_SIZE 4
|
|
#define MAX_STACK_SIZE 64
|
|
#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 __visible kprobe_opcode_t optprobe_template_entry[];
|
|
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 + RELATIVE_ADDR_SIZE)
|
|
#define MAX_OPTINSN_SIZE \
|
|
(((unsigned long)optprobe_template_end - \
|
|
(unsigned long)optprobe_template_entry) + \
|
|
MAX_OPTIMIZED_LENGTH + RELATIVEJUMP_SIZE)
|
|
|
|
extern const int kretprobe_blacklist_size;
|
|
|
|
void arch_remove_kprobe(struct kprobe *p);
|
|
asmlinkage void kretprobe_trampoline(void);
|
|
|
|
extern void arch_kprobe_override_function(struct pt_regs *regs);
|
|
|
|
/* Architecture specific copy of original instruction*/
|
|
struct arch_specific_insn {
|
|
/* copy of the original instruction */
|
|
kprobe_opcode_t *insn;
|
|
/*
|
|
* boostable = false: This instruction type is not boostable.
|
|
* boostable = true: 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).
|
|
*/
|
|
bool boostable;
|
|
bool if_modifier;
|
|
};
|
|
|
|
struct arch_optimized_insn {
|
|
/* copy of the original instructions */
|
|
kprobe_opcode_t copied_insn[RELATIVE_ADDR_SIZE];
|
|
/* detour code buffer */
|
|
kprobe_opcode_t *insn;
|
|
/* the size of instructions copied to detour code buffer */
|
|
size_t size;
|
|
};
|
|
|
|
/* Return true (!0) if optinsn is prepared for optimization. */
|
|
static inline int arch_prepared_optinsn(struct arch_optimized_insn *optinsn)
|
|
{
|
|
return optinsn->size;
|
|
}
|
|
|
|
struct prev_kprobe {
|
|
struct kprobe *kp;
|
|
unsigned long status;
|
|
unsigned long old_flags;
|
|
unsigned long saved_flags;
|
|
};
|
|
|
|
/* per-cpu kprobe control block */
|
|
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);
|
|
extern int kprobe_debug_handler(struct pt_regs *regs);
|
|
|
|
#endif /* CONFIG_KPROBES */
|
|
#endif /* _ASM_X86_KPROBES_H */
|