Quelle  unwind.h   Sprache: C

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
 */

#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 *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)
{
}

#define unwind_add_table(a, b, c)
#define unwind_remove_table(a, b)

#endif /* CONFIG_ARC_DW2_UNWIND */

#endif /* _ASM_ARC_UNWIND_H */