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Filename : uprobes_i386.h
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#ifndef _ASM_UPROBES_H
#define _ASM_UPROBES_H
/*
 *  Userspace Probes (UProbes)
 *  include/asm-i386/uprobes.h
 *
 * 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, see <http://www.gnu.org/licenses/>.
 *
 * Copyright (C) IBM Corporation, 2006
 */
#include <linux/types.h>
#include <linux/ptrace.h>
#include <linux/signal.h>

/* Normally defined in Kconfig */
#define CONFIG_URETPROBES 1
#define CONFIG_UPROBES_SSOL 1

typedef u8 uprobe_opcode_t;
#define BREAKPOINT_INSTRUCTION	0xcc
#define BP_INSN_SIZE 1
#define MAX_UINSN_BYTES 16
#define SLOT_IP(tsk) 12	/* instruction pointer slot from include/asm/elf.h */

#define BREAKPOINT_SIGNAL SIGTRAP
#define SSTEP_SIGNAL SIGTRAP

#define UPFIX_ABS_IP  0x4	/* %ip after SS needs no fixup */
#define UPFIX_RETURN  0x8	/* need to adjust return address on stack */

struct uprobe_probept_arch_info {
       unsigned long flags;
};
struct uprobe_task_arch_info {};

/* Architecture specific switch for where the IP points after a bp hit */
#define ARCH_BP_INST_PTR(inst_ptr)	(inst_ptr - BP_INSN_SIZE)

struct uprobe_probept;
struct uprobe_task;
struct task_struct;
static int arch_validate_probed_insn(struct uprobe_probept *ppt,
						struct task_struct *tsk);

/* On i386, the int3 traps leaves eip pointing past the int3 instruction. */
static inline unsigned long arch_get_probept(struct pt_regs *regs)
{
	return (unsigned long) (regs->eip - BP_INSN_SIZE);
}

static inline void arch_reset_ip_for_sstep(struct pt_regs *regs)
{
	regs->eip -= BP_INSN_SIZE;
}

static inline void arch_restore_uret_addr(unsigned long ret_addr,
		struct pt_regs *regs)
{
	regs->eip = ret_addr;
}

static unsigned long arch_get_cur_sp(struct pt_regs *regs)
{
	return (unsigned long)regs->esp;
}

static unsigned long arch_hijack_uret_addr(unsigned long trampoline_addr,
		struct pt_regs *regs, struct uprobe_task *utask);

static unsigned long arch_predict_sp_at_ret(struct pt_regs *regs,
		struct task_struct *tsk);

#endif				/* _ASM_UPROBES_H */