[mirror_ubuntu-bionic-kernel.git] / arch / s390 / include / asm / kprobes.h

/* SPDX-License-Identifier: GPL-2.0+ */
#ifndef _ASM_S390_KPROBES_H
#define _ASM_S390_KPROBES_H
/*
 *  Kernel Probes (KProbes)
 *
 * Copyright IBM Corp. 2002, 2006
 *
 * 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>
 * 2005-Dec	Used as a template for s390 by Mike Grundy
 *		<grundym@us.ibm.com>
 */
#include <linux/types.h>
#include <asm-generic/kprobes.h>

#define BREAKPOINT_INSTRUCTION	0x0002

#define FIXUP_PSW_NORMAL	0x08
#define FIXUP_BRANCH_NOT_TAKEN	0x04
#define FIXUP_RETURN_REGISTER	0x02
#define FIXUP_NOT_REQUIRED	0x01

int probe_is_prohibited_opcode(u16 *insn);
int probe_get_fixup_type(u16 *insn);
int probe_is_insn_relative_long(u16 *insn);

#ifdef CONFIG_KPROBES
#include <linux/ptrace.h>
#include <linux/percpu.h>
#include <linux/sched/task_stack.h>

#define __ARCH_WANT_KPROBES_INSN_SLOT

struct pt_regs;
struct kprobe;

typedef u16 kprobe_opcode_t;

/* Maximum instruction size is 3 (16bit) halfwords: */
#define MAX_INSN_SIZE		0x0003
#define MAX_STACK_SIZE		64
#define MIN_STACK_SIZE(ADDR) (((MAX_STACK_SIZE) < \
	(((unsigned long)task_stack_page(current)) + THREAD_SIZE - (ADDR))) \
	? (MAX_STACK_SIZE) \
	: (((unsigned long)task_stack_page(current)) + THREAD_SIZE - (ADDR)))

#define kretprobe_blacklist_size 0

/* Architecture specific copy of original instruction */
struct arch_specific_insn {
	/* copy of original instruction */
	kprobe_opcode_t *insn;
	unsigned int is_ftrace_insn : 1;
};

struct prev_kprobe {
	struct kprobe *kp;
	unsigned long status;
};

/* per-cpu kprobe control block */
struct kprobe_ctlblk {
	unsigned long kprobe_status;
	unsigned long kprobe_saved_imask;
	unsigned long kprobe_saved_ctl[3];
	struct prev_kprobe prev_kprobe;
	struct pt_regs jprobe_saved_regs;
	kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE];
};

void arch_remove_kprobe(struct kprobe *p);
void kretprobe_trampoline(void);

int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
int kprobe_exceptions_notify(struct notifier_block *self,
	unsigned long val, void *data);

#define flush_insn_slot(p)	do { } while (0)

#endif /* CONFIG_KPROBES */
#endif	/* _ASM_S390_KPROBES_H */
Commit	Line	Data
0b73214f	1	/* SPDX-License-Identifier: GPL-2.0+ */
4ba069b8 MG	2	#ifndef _ASM_S390_KPROBES_H
	3	#define _ASM_S390_KPROBES_H
	4	/*
	5	* Kernel Probes (KProbes)
	6	*
a53c8fab	7	* Copyright IBM Corp. 2002, 2006
4ba069b8 MG	8	*
	9	* 2002-Oct Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
	10	* Probes initial implementation ( includes suggestions from
	11	* Rusty Russell).
	12	* 2004-Nov Modified for PPC64 by Ananth N Mavinakayanahalli
	13	* <ananth@in.ibm.com>
	14	* 2005-Dec Used as a template for s390 by Mike Grundy
	15	* <grundym@us.ibm.com>
	16	*/
db55947d	17	#include <linux/types.h>
7d134b2c LR	18	#include <asm-generic/kprobes.h>
	19
	20	#define BREAKPOINT_INSTRUCTION 0x0002
	21
db55947d HC	22	#define FIXUP_PSW_NORMAL 0x08
	23	#define FIXUP_BRANCH_NOT_TAKEN 0x04
	24	#define FIXUP_RETURN_REGISTER 0x02
	25	#define FIXUP_NOT_REQUIRED 0x01
	26
	27	int probe_is_prohibited_opcode(u16 *insn);
	28	int probe_get_fixup_type(u16 *insn);
	29	int probe_is_insn_relative_long(u16 *insn);
	30
7d134b2c	31	#ifdef CONFIG_KPROBES
4ba069b8 MG	32	#include <linux/ptrace.h>
4ba069b8 MG	33	#include <linux/percpu.h>
68db0cf1	34	#include <linux/sched/task_stack.h>
4ba069b8	35
63c40436 HC	36	#define __ARCH_WANT_KPROBES_INSN_SLOT
63c40436 HC	37
4ba069b8 MG	38	struct pt_regs;
	39	struct kprobe;
	40
	41	typedef u16 kprobe_opcode_t;
4ba069b8 MG	42
	43	/* Maximum instruction size is 3 (16bit) halfwords: */
	44	#define MAX_INSN_SIZE 0x0003
	45	#define MAX_STACK_SIZE 64
	46	#define MIN_STACK_SIZE(ADDR) (((MAX_STACK_SIZE) < \
c3bdf2e1	47	(((unsigned long)task_stack_page(current)) + THREAD_SIZE - (ADDR))) \
4ba069b8	48	? (MAX_STACK_SIZE) \
c3bdf2e1	49	: (((unsigned long)task_stack_page(current)) + THREAD_SIZE - (ADDR)))
4ba069b8	50
f438d914	51	#define kretprobe_blacklist_size 0
4ba069b8	52
4ba069b8 MG	53	/* Architecture specific copy of original instruction */
	54	struct arch_specific_insn {
	55	/* copy of original instruction */
63c40436	56	kprobe_opcode_t *insn;
c933146a	57	unsigned int is_ftrace_insn : 1;
4ba069b8 MG	58	};
4ba069b8 MG	59
4ba069b8 MG	60	struct prev_kprobe {
	61	struct kprobe *kp;
	62	unsigned long status;
4ba069b8 MG	63	};
	64
	65	/* per-cpu kprobe control block */
	66	struct kprobe_ctlblk {
	67	unsigned long kprobe_status;
	68	unsigned long kprobe_saved_imask;
	69	unsigned long kprobe_saved_ctl[3];
4ba069b8	70	struct prev_kprobe prev_kprobe;
92b8cbf1	71	struct pt_regs jprobe_saved_regs;
4ba069b8 MG	72	kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE];
	73	};
	74
	75	void arch_remove_kprobe(struct kprobe *p);
	76	void kretprobe_trampoline(void);
4ba069b8	77
33464e3b CH	78	int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
	79	int kprobe_exceptions_notify(struct notifier_block *self,
	80	unsigned long val, void *data);
	81
4ba069b8 MG	82	#define flush_insn_slot(p) do { } while (0)
4ba069b8 MG	83
7d134b2c	84	#endif /* CONFIG_KPROBES */
4ba069b8	85	#endif /* _ASM_S390_KPROBES_H */