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 *unwind_add_table(struct module *module, const void *table_start,
116 unsigned long table_size);
117 extern void unwind_remove_table(void *handle, int init_only);
118
119 static inline int
arch_unwind_init_running(struct unwind_frame_info * info,int (* callback)(struct unwind_frame_info * info,void * arg),void * arg)120 arch_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
arch_unw_user_mode(const struct unwind_frame_info * info)128 static inline int arch_unw_user_mode(const struct unwind_frame_info *info)
129 {
130 return 0;
131 }
132
arch_unw_init_blocked(struct unwind_frame_info * info)133 static inline void arch_unw_init_blocked(struct unwind_frame_info *info)
134 {
135 return;
136 }
137
arch_unw_init_frame_info(struct unwind_frame_info * info,struct pt_regs * regs)138 static 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
arc_unwind_init(void)150 static 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