arc-linux-uclibc/include/asm/unwind.h

/*
 * 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_STACK_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,
                    asmlinkage 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


#endif /* _ASM_ARC_UNWIND_H */