/*
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/

#ifndef _ASM_ARC_UNWIND_H
#define _ASM_ARC_UNWIND_H

#ifdef CONFIG_ARC_DW2_UNWIND

#include <linux/sched.h>

struct arc700_regs {
unsigned long r0;
unsigned long r1;
unsigned long r2;
unsigned long r3;
unsigned long r4;
unsigned long r5;
unsigned long r6;
unsigned long r7;
unsigned long r8;
unsigned long r9;
unsigned long r10;
unsigned long r11;
unsigned long r12;
unsigned long r13;
unsigned long r14;
unsigned long r15;
unsigned long r16;
unsigned long r17;
unsigned long r18;
unsigned long r19;
unsigned long r20;
unsigned long r21;
unsigned long r22;
unsigned long r23;
unsigned long r24;
unsigned long r25;
unsigned long r26;
unsigned long r27; /* fp */
unsigned long r28; /* sp */
unsigned long r29;
unsigned long r30;
unsigned long r31; /* blink */
unsigned long r63; /* pc */
};

struct unwind_frame_info {
struct arc700_regs regs;
struct task_struct *task;
unsigned call_frame:1;
};

#define UNW_PC(frame) ((frame)->regs.r63)
#define UNW_SP(frame) ((frame)->regs.r28)
#define UNW_BLINK(frame) ((frame)->regs.r31)

/* Rajesh FIXME */
#ifdef CONFIG_FRAME_POINTER
#define UNW_FP(frame) ((frame)->regs.r27)
#define FRAME_RETADDR_OFFSET 4
#define FRAME_LINK_OFFSET 0
#define STACK_BOTTOM_UNW(tsk) STACK_LIMIT((tsk)->thread.ksp)
#define STACK_TOP_UNW(tsk) ((tsk)->thread.ksp)
#else
#define UNW_FP(frame) ((void)(frame), 0)
#endif

#define STACK_LIMIT(ptr) (((ptr) - 1) & ~(THREAD_SIZE - 1))

#define UNW_REGISTER_INFO \
PTREGS_INFO(r0), \
PTREGS_INFO(r1), \
PTREGS_INFO(r2), \
PTREGS_INFO(r3), \
PTREGS_INFO(r4), \
PTREGS_INFO(r5), \
PTREGS_INFO(r6), \
PTREGS_INFO(r7), \
PTREGS_INFO(r8), \
PTREGS_INFO(r9), \
PTREGS_INFO(r10), \
PTREGS_INFO(r11), \
PTREGS_INFO(r12), \
PTREGS_INFO(r13), \
PTREGS_INFO(r14), \
PTREGS_INFO(r15), \
PTREGS_INFO(r16), \
PTREGS_INFO(r17), \
PTREGS_INFO(r18), \
PTREGS_INFO(r19), \
PTREGS_INFO(r20), \
PTREGS_INFO(r21), \
PTREGS_INFO(r22), \
PTREGS_INFO(r23), \
PTREGS_INFO(r24), \
PTREGS_INFO(r25), \
PTREGS_INFO(r26), \
PTREGS_INFO(r27), \
PTREGS_INFO(r28), \
PTREGS_INFO(r29), \
PTREGS_INFO(r30), \
PTREGS_INFO(r31), \
PTREGS_INFO(r63)

#define UNW_DEFAULT_RA(raItem, dataAlign) \
((raItem).where == Memory && !((raItem).value * (dataAlign) + 4))

extern int arc_unwind(struct unwind_frame_info *frame);
extern void arc_unwind_init(void);
extern void arc_unwind_setup(void);
extern void *unwind_add_table(struct module *module, const void *table_start,
unsigned long table_size);
extern void unwind_remove_table(void *handle, int init_only);

static inline int
arch_unwind_init_running(struct unwind_frame_info *info,
int (*callback) (struct unwind_frame_info *info,
void *arg),
void *arg)
{
return 0;
}

static inline int arch_unw_user_mode(const struct unwind_frame_info *info)
{
return 0;
}

static inline void arch_unw_init_blocked(struct unwind_frame_info *info)
{
return;
}

static inline void arch_unw_init_frame_info(struct unwind_frame_info *info,
struct pt_regs *regs)
{
return;
}

#else

#define UNW_PC(frame) ((void)(frame), 0)
#define UNW_SP(frame) ((void)(frame), 0)
#define UNW_FP(frame) ((void)(frame), 0)

static inline void arc_unwind_init(void)
{
}

static inline void arc_unwind_setup(void)
{
}
#define unwind_add_table(a, b, c)
#define unwind_remove_table(a, b)

#endif /* CONFIG_ARC_DW2_UNWIND */

#endif /* _ASM_ARC_UNWIND_H */