kernel/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
  16 struct 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
  52 struct 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
 113 extern int arc_unwind(struct unwind_frame_info *frame);
 114 extern void arc_unwind_init(void);
 115 extern void arc_unwind_setup(void);
 116 extern void *unwind_add_table(struct module *module, const void *table_start,
 117                               unsigned long table_size);
 118 extern void unwind_remove_table(void *handle, int init_only);
 119
 120 static inline int
 121 arch_unwind_init_running(struct unwind_frame_info *info,
 122                          int (*callback) (struct unwind_frame_info *info,
 123                                           void *arg),
 124                          void *arg)
 125 {
 126         return 0;
 127 }
 128
 129 static inline int arch_unw_user_mode(const struct unwind_frame_info *info)
 130 {
 131         return 0;
 132 }
 133
 134 static inline void arch_unw_init_blocked(struct unwind_frame_info *info)
 135 {
 136         return;
 137 }
 138
 139 static inline void arch_unw_init_frame_info(struct unwind_frame_info *info,
 140                                             struct pt_regs *regs)
 141 {
 142         return;
 143 }
 144
 145 #else
 146
 147 #define UNW_PC(frame) ((void)(frame), 0)
 148 #define UNW_SP(frame) ((void)(frame), 0)
 149 #define UNW_FP(frame) ((void)(frame), 0)
 150
 151 static inline void arc_unwind_init(void)
 152 {
 153 }
 154
 155 static inline void arc_unwind_setup(void)
 156 {
 157 }
 158 #define unwind_add_table(a, b, c)
 159 #define unwind_remove_table(a, b)
 160
 161 #endif /* CONFIG_ARC_DW2_UNWIND */
 162
 163 #endif /* _ASM_ARC_UNWIND_H */