[deliverable/linux.git] / arch / s390 / include / asm / kprobes.h

#ifndef _ASM_S390_KPROBES_H
#define _ASM_S390_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 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 <linux/ptrace.h>
#include <linux/percpu.h>

#define __ARCH_WANT_KPROBES_INSN_SLOT

struct pt_regs;
struct kprobe;

typedef u16 kprobe_opcode_t;
#define BREAKPOINT_INSTRUCTION	0x0002

/* 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)current_thread_info()) + THREAD_SIZE - (ADDR))) \
	? (MAX_STACK_SIZE) \
	: (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR)))

#define kretprobe_blacklist_size 0

#define KPROBE_SWAP_INST	0x10

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

/* 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);

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

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

#endif	/* _ASM_S390_KPROBES_H */
Commit	Line	Data
4ba069b8 MG	1	#ifndef _ASM_S390_KPROBES_H
	2	#define _ASM_S390_KPROBES_H
	3	/*
	4	* Kernel Probes (KProbes)
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	19	*
a53c8fab	20	* Copyright IBM Corp. 2002, 2006
4ba069b8 MG	21	*
	22	* 2002-Oct Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
	23	* Probes initial implementation ( includes suggestions from
	24	* Rusty Russell).
	25	* 2004-Nov Modified for PPC64 by Ananth N Mavinakayanahalli
	26	* <ananth@in.ibm.com>
	27	* 2005-Dec Used as a template for s390 by Mike Grundy
	28	* <grundym@us.ibm.com>
	29	*/
	30	#include <linux/types.h>
	31	#include <linux/ptrace.h>
	32	#include <linux/percpu.h>
	33
63c40436 HC	34	#define __ARCH_WANT_KPROBES_INSN_SLOT
63c40436 HC	35
4ba069b8 MG	36	struct pt_regs;
	37	struct kprobe;
	38
	39	typedef u16 kprobe_opcode_t;
	40	#define BREAKPOINT_INSTRUCTION 0x0002
	41
	42	/* Maximum instruction size is 3 (16bit) halfwords: */
	43	#define MAX_INSN_SIZE 0x0003
	44	#define MAX_STACK_SIZE 64
	45	#define MIN_STACK_SIZE(ADDR) (((MAX_STACK_SIZE) < \
	46	(((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR))) \
	47	? (MAX_STACK_SIZE) \
	48	: (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR)))
	49
f438d914	50	#define kretprobe_blacklist_size 0
4ba069b8 MG	51
	52	#define KPROBE_SWAP_INST 0x10
	53
	54	#define FIXUP_PSW_NORMAL 0x08
	55	#define FIXUP_BRANCH_NOT_TAKEN 0x04
	56	#define FIXUP_RETURN_REGISTER 0x02
	57	#define FIXUP_NOT_REQUIRED 0x01
	58
	59	/* Architecture specific copy of original instruction */
	60	struct arch_specific_insn {
	61	/* copy of original instruction */
63c40436	62	kprobe_opcode_t *insn;
c933146a	63	unsigned int is_ftrace_insn : 1;
4ba069b8 MG	64	};
4ba069b8 MG	65
4ba069b8 MG	66	struct prev_kprobe {
	67	struct kprobe *kp;
	68	unsigned long status;
4ba069b8 MG	69	};
	70
	71	/* per-cpu kprobe control block */
	72	struct kprobe_ctlblk {
	73	unsigned long kprobe_status;
	74	unsigned long kprobe_saved_imask;
	75	unsigned long kprobe_saved_ctl[3];
4ba069b8	76	struct prev_kprobe prev_kprobe;
92b8cbf1	77	struct pt_regs jprobe_saved_regs;
4ba069b8 MG	78	kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE];
	79	};
	80
	81	void arch_remove_kprobe(struct kprobe *p);
	82	void kretprobe_trampoline(void);
4ba069b8	83
33464e3b CH	84	int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
	85	int kprobe_exceptions_notify(struct notifier_block *self,
	86	unsigned long val, void *data);
	87
975fab17 JW	88	int probe_is_prohibited_opcode(u16 *insn);
	89	int probe_get_fixup_type(u16 *insn);
	90	int probe_is_insn_relative_long(u16 *insn);
	91
4ba069b8 MG	92	#define flush_insn_slot(p) do { } while (0)
	93
	94	#endif /* _ASM_S390_KPROBES_H */