1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 #ifndef _ASM_POWERPC_KPROBES_H 3 #define _ASM_POWERPC_KPROBES_H 4 5 #include <asm-generic/kprobes.h> 6 7 #ifdef __KERNEL__ 8 /* 9 * Kernel Probes (KProbes) 10 * 11 * Copyright (C) IBM Corporation, 2002, 2004 12 * 13 * 2002-Oct Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel 14 * Probes initial implementation ( includes suggestions from 15 * Rusty Russell). 16 * 2004-Nov Modified for PPC64 by Ananth N Mavinakayanahalli 17 * <ananth@in.ibm.com> 18 */ 19 #include <linux/types.h> 20 #include <linux/ptrace.h> 21 #include <linux/percpu.h> 22 #include <linux/module.h> 23 #include <asm/probes.h> 24 #include <asm/code-patching.h> 25 26 #ifdef CONFIG_KPROBES 27 #define __ARCH_WANT_KPROBES_INSN_SLOT 28 29 struct pt_regs; 30 struct kprobe; 31 32 typedef u32 kprobe_opcode_t; 33 34 extern kprobe_opcode_t optinsn_slot; 35 36 /* Optinsn template address */ 37 extern kprobe_opcode_t optprobe_template_entry[]; 38 extern kprobe_opcode_t optprobe_template_op_address[]; 39 extern kprobe_opcode_t optprobe_template_call_handler[]; 40 extern kprobe_opcode_t optprobe_template_insn[]; 41 extern kprobe_opcode_t optprobe_template_call_emulate[]; 42 extern kprobe_opcode_t optprobe_template_ret[]; 43 extern kprobe_opcode_t optprobe_template_end[]; 44 45 /* Fixed instruction size for powerpc */ 46 #define MAX_INSN_SIZE 2 47 #define MAX_OPTIMIZED_LENGTH sizeof(kprobe_opcode_t) /* 4 bytes */ 48 #define MAX_OPTINSN_SIZE (optprobe_template_end - optprobe_template_entry) 49 #define RELATIVEJUMP_SIZE sizeof(kprobe_opcode_t) /* 4 bytes */ 50 51 #define flush_insn_slot(p) do { } while (0) 52 #define kretprobe_blacklist_size 0 53 54 void __kretprobe_trampoline(void); 55 extern void arch_remove_kprobe(struct kprobe *p); 56 57 /* Architecture specific copy of original instruction */ 58 struct arch_specific_insn { 59 /* copy of original instruction */ 60 kprobe_opcode_t *insn; 61 /* 62 * Set in kprobes code, initially to 0. If the instruction can be 63 * eumulated, this is set to 1, if not, to -1. 64 */ 65 int boostable; 66 }; 67 68 struct prev_kprobe { 69 struct kprobe *kp; 70 unsigned long status; 71 unsigned long saved_msr; 72 }; 73 74 /* per-cpu kprobe control block */ 75 struct kprobe_ctlblk { 76 unsigned long kprobe_status; 77 unsigned long kprobe_saved_msr; 78 struct prev_kprobe prev_kprobe; 79 }; 80 81 struct arch_optimized_insn { 82 kprobe_opcode_t copied_insn[1]; 83 /* detour buffer */ 84 kprobe_opcode_t *insn; 85 }; 86 87 extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr); 88 extern int kprobe_handler(struct pt_regs *regs); 89 extern int kprobe_post_handler(struct pt_regs *regs); 90 #else 91 static inline int kprobe_handler(struct pt_regs *regs) { return 0; } 92 static inline int kprobe_post_handler(struct pt_regs *regs) { return 0; } 93 #endif /* CONFIG_KPROBES */ 94 #endif /* __KERNEL__ */ 95 #endif /* _ASM_POWERPC_KPROBES_H */ 96