LXR linux/arch/arc/include/asm/unwind.h

   1/*
   2 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
   3 *
   4 * This program is free software; you can redistribute it and/or modify
   5 * it under the terms of the GNU General Public License version 2 as
   6 * published by the Free Software Foundation.
   7 */
   8
   9#ifndef _ASM_ARC_UNWIND_H
  10#define _ASM_ARC_UNWIND_H
  11
  12#ifdef CONFIG_ARC_DW2_UNWIND
  13
  14#include <linux/sched.h>
  15
  16struct arc700_regs {
  17        unsigned long r0;
  18        unsigned long r1;
  19        unsigned long r2;
  20        unsigned long r3;
  21        unsigned long r4;
  22        unsigned long r5;
  23        unsigned long r6;
  24        unsigned long r7;
  25        unsigned long r8;
  26        unsigned long r9;
  27        unsigned long r10;
  28        unsigned long r11;
  29        unsigned long r12;
  30        unsigned long r13;
  31        unsigned long r14;
  32        unsigned long r15;
  33        unsigned long r16;
  34        unsigned long r17;
  35        unsigned long r18;
  36        unsigned long r19;
  37        unsigned long r20;
  38        unsigned long r21;
  39        unsigned long r22;
  40        unsigned long r23;
  41        unsigned long r24;
  42        unsigned long r25;
  43        unsigned long r26;
  44        unsigned long r27;      /* fp */
  45        unsigned long r28;      /* sp */
  46        unsigned long r29;
  47        unsigned long r30;
  48        unsigned long r31;      /* blink */
  49        unsigned long r63;      /* pc */
  50};
  51
  52struct unwind_frame_info {
  53        struct arc700_regs regs;
  54        struct task_struct *task;
  55        unsigned call_frame:1;
  56};
  57
  58#define UNW_PC(frame)           ((frame)->regs.r63)
  59#define UNW_SP(frame)           ((frame)->regs.r28)
  60#define UNW_BLINK(frame)        ((frame)->regs.r31)
  61
  62/* Rajesh FIXME */
  63#ifdef CONFIG_FRAME_POINTER
  64#define UNW_FP(frame)           ((frame)->regs.r27)
  65#define FRAME_RETADDR_OFFSET    4
  66#define FRAME_LINK_OFFSET       0
  67#define STACK_BOTTOM_UNW(tsk)   STACK_LIMIT((tsk)->thread.ksp)
  68#define STACK_TOP_UNW(tsk)      ((tsk)->thread.ksp)
  69#else
  70#define UNW_FP(frame)           ((void)(frame), 0)
  71#endif
  72
  73#define STACK_LIMIT(ptr)        (((ptr) - 1) & ~(THREAD_SIZE - 1))
  74
  75#define UNW_REGISTER_INFO \
  76        PTREGS_INFO(r0), \
  77        PTREGS_INFO(r1), \
  78        PTREGS_INFO(r2), \
  79        PTREGS_INFO(r3), \
  80        PTREGS_INFO(r4), \
  81        PTREGS_INFO(r5), \
  82        PTREGS_INFO(r6), \
  83        PTREGS_INFO(r7), \
  84        PTREGS_INFO(r8), \
  85        PTREGS_INFO(r9), \
  86        PTREGS_INFO(r10), \
  87        PTREGS_INFO(r11), \
  88        PTREGS_INFO(r12), \
  89        PTREGS_INFO(r13), \
  90        PTREGS_INFO(r14), \
  91        PTREGS_INFO(r15), \
  92        PTREGS_INFO(r16), \
  93        PTREGS_INFO(r17), \
  94        PTREGS_INFO(r18), \
  95        PTREGS_INFO(r19), \
  96        PTREGS_INFO(r20), \
  97        PTREGS_INFO(r21), \
  98        PTREGS_INFO(r22), \
  99        PTREGS_INFO(r23), \
 100        PTREGS_INFO(r24), \
 101        PTREGS_INFO(r25), \
 102        PTREGS_INFO(r26), \
 103        PTREGS_INFO(r27), \
 104        PTREGS_INFO(r28), \
 105        PTREGS_INFO(r29), \
 106        PTREGS_INFO(r30), \
 107        PTREGS_INFO(r31), \
 108        PTREGS_INFO(r63)
 109
 110#define UNW_DEFAULT_RA(raItem, dataAlign) \
 111        ((raItem).where == Memory && !((raItem).value * (dataAlign) + 4))
 112
 113extern int arc_unwind(struct unwind_frame_info *frame);
 114extern void arc_unwind_init(void);
 115extern void *unwind_add_table(struct module *module, const void *table_start,
 116                              unsigned long table_size);
 117extern void unwind_remove_table(void *handle, int init_only);
 118
 119static inline int
 120arch_unwind_init_running(struct unwind_frame_info *info,
 121                         int (*callback) (struct unwind_frame_info *info,
 122                                          void *arg),
 123                         void *arg)
 124{
 125        return 0;
 126}
 127
 128static inline int arch_unw_user_mode(const struct unwind_frame_info *info)
 129{
 130        return 0;
 131}
 132
 133static inline void arch_unw_init_blocked(struct unwind_frame_info *info)
 134{
 135        return;
 136}
 137
 138static inline void arch_unw_init_frame_info(struct unwind_frame_info *info,
 139                                            struct pt_regs *regs)
 140{
 141        return;
 142}
 143
 144#else
 145
 146#define UNW_PC(frame) ((void)(frame), 0)
 147#define UNW_SP(frame) ((void)(frame), 0)
 148#define UNW_FP(frame) ((void)(frame), 0)
 149
 150static inline void arc_unwind_init(void)
 151{
 152}
 153
 154#define unwind_add_table(a, b, c)
 155#define unwind_remove_table(a, b)
 156
 157#endif /* CONFIG_ARC_DW2_UNWIND */
 158
 159#endif /* _ASM_ARC_UNWIND_H */
 160