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Diffstat (limited to 'arch/powerpc/include/asm/kprobes.h')
| -rw-r--r-- | arch/powerpc/include/asm/kprobes.h | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/kprobes.h b/arch/powerpc/include/asm/kprobes.h new file mode 100644 index 0000000000..c8e4b4fd4e --- /dev/null +++ b/arch/powerpc/include/asm/kprobes.h @@ -0,0 +1,97 @@ +/* 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/code-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_exceptions_notify(struct notifier_block *self, + unsigned long val, void *data); +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 */ |