/*
* Copyright 2010 Tilera Corporation. All Rights Reserved.
*
* 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, version 2.
*
* 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, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for
* more details.
*/
#ifndef _ASM_TILE_PTRACE_H
#define _ASM_TILE_PTRACE_H

#include <linux/compiler.h>

#ifndef __ASSEMBLY__
/* Benefit from consistent use of "long" on all chips. */
typedef unsigned long pt_reg_t;
#endif

#include <uapi/asm/ptrace.h>

#define PTRACE_O_MASK_TILE (PTRACE_O_TRACEMIGRATE)
#define PT_TRACE_MIGRATE PT_EVENT_FLAG(PTRACE_EVENT_MIGRATE)

/* Flag bits in pt_regs.flags */
#define PT_FLAGS_DISABLE_IRQ 1 /* on return to kernel, disable irqs */
#define PT_FLAGS_CALLER_SAVES 2 /* caller-save registers are valid */
#define PT_FLAGS_RESTORE_REGS 4 /* restore callee-save regs on return */

#ifndef __ASSEMBLY__

#define regs_return_value(regs) ((regs)->regs[0])
#define instruction_pointer(regs) ((regs)->pc)
#define profile_pc(regs) instruction_pointer(regs)
#define user_stack_pointer(regs) ((regs)->sp)

/* Does the process account for user or for system time? */
#define user_mode(regs) (EX1_PL((regs)->ex1) < KERNEL_PL)

/* Fill in a struct pt_regs with the current kernel registers. */
struct pt_regs *get_pt_regs(struct pt_regs *);

/* Trace the current syscall. */
extern int do_syscall_trace_enter(struct pt_regs *regs);
extern void do_syscall_trace_exit(struct pt_regs *regs);

#define arch_has_single_step() (1)

/*
* A structure for all single-stepper state.
*
* Also update defines in assembler section if it changes
*/
struct single_step_state {
/* the page to which we will write hacked-up bundles */
void __user *buffer;

union {
int flags;
struct {
unsigned long is_enabled:1, update:1, update_reg:6;
};
};

unsigned long orig_pc; /* the original PC */
unsigned long next_pc; /* return PC if no branch (PC + 1) */
unsigned long branch_next_pc; /* return PC if we did branch/jump */
unsigned long update_value; /* value to restore to update_target */
};

/* Single-step the instruction at regs->pc */
extern void single_step_once(struct pt_regs *regs);

/* Clean up after execve(). */
extern void single_step_execve(void);

struct task_struct;

extern void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs);

#ifdef __tilegx__
/* We need this since sigval_t has a user pointer in it, for GETSIGINFO etc. */
#define __ARCH_WANT_COMPAT_SYS_PTRACE
#endif

#endif /* !__ASSEMBLY__ */

#define SINGLESTEP_STATE_MASK_IS_ENABLED 0x1
#define SINGLESTEP_STATE_MASK_UPDATE 0x2
#define SINGLESTEP_STATE_TARGET_LB 2
#define SINGLESTEP_STATE_TARGET_UB 7

#endif /* _ASM_TILE_PTRACE_H */