/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _ASM_POWERPC_KPROBES_H
#define _ASM_POWERPC_KPROBES_H
#include <asm -generic/kprobes.h>
#ifdef __KERNEL__
/*
* Kernel Probes ( KProbes )
*
* Copyright ( C ) IBM Corporation , 2002 , 2004
*
* 2002 - Oct Created by Vamsi Krishna S < vamsi_krishna @ in . ibm . com > Kernel
* Probes initial implementation ( includes suggestions from
* Rusty Russell ) .
* 2004 - Nov Modified for PPC64 by Ananth N Mavinakayanahalli
* < ananth @ in . ibm . com >
*/
#include <linux/types.h>
#include <linux/ptrace.h>
#include <linux/percpu.h>
#include <linux/module.h>
#include <asm /probes.h>
#include <asm /text-patching.h>
#ifdef CONFIG_KPROBES
#define __ARCH_WANT_KPROBES_INSN_SLOT
struct pt_regs;
struct kprobe;
typedef u32 kprobe_opcode_t;
extern kprobe_opcode_t optinsn_slot;
/* Optinsn template address */
extern kprobe_opcode_t optprobe_template_entry[];
extern kprobe_opcode_t optprobe_template_op_address[];
extern kprobe_opcode_t optprobe_template_call_handler[];
extern kprobe_opcode_t optprobe_template_insn[];
extern kprobe_opcode_t optprobe_template_call_emulate[];
extern kprobe_opcode_t optprobe_template_ret[];
extern kprobe_opcode_t optprobe_template_end[];
/* Fixed instruction size for powerpc */
#define MAX_INSN_SIZE 2
#define MAX_OPTIMIZED_LENGTH sizeof (kprobe_opcode_t) /* 4 bytes */
#define MAX_OPTINSN_SIZE (optprobe_template_end - optprobe_template_entry)
#define RELATIVEJUMP_SIZE sizeof (kprobe_opcode_t) /* 4 bytes */
#define flush_insn_slot(p) do { } while (0 )
#define kretprobe_blacklist_size 0
void __kretprobe_trampoline(void );
extern void arch_remove_kprobe(struct kprobe *p);
/* Architecture specific copy of original instruction */
struct arch_specific_insn {
/* copy of original instruction */
kprobe_opcode_t *insn;
/*
* Set in kprobes code , initially to 0 . If the instruction can be
* eumulated , this is set to 1 , if not , to - 1 .
*/
int boostable;
};
struct prev_kprobe {
struct kprobe *kp;
unsigned long status;
unsigned long saved_msr;
};
/* per-cpu kprobe control block */
struct kprobe_ctlblk {
unsigned long kprobe_status;
unsigned long kprobe_saved_msr;
struct prev_kprobe prev_kprobe;
};
struct arch_optimized_insn {
kprobe_opcode_t copied_insn[1 ];
/* detour buffer */
kprobe_opcode_t *insn;
};
extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
extern int kprobe_handler(struct pt_regs *regs);
extern int kprobe_post_handler(struct pt_regs *regs);
#else
static inline int kprobe_handler(struct pt_regs *regs) { return 0 ; }
static inline int kprobe_post_handler(struct pt_regs *regs) { return 0 ; }
#endif /* CONFIG_KPROBES */
#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_KPROBES_H */
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