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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