1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
4  */
5 
6 #ifndef _ASM_ARC_UNWIND_H
7 #define _ASM_ARC_UNWIND_H
8 
9 #ifdef CONFIG_ARC_DW2_UNWIND
10 
11 #include <linux/sched.h>
12 
13 struct arc700_regs {
14 	unsigned long r0;
15 	unsigned long r1;
16 	unsigned long r2;
17 	unsigned long r3;
18 	unsigned long r4;
19 	unsigned long r5;
20 	unsigned long r6;
21 	unsigned long r7;
22 	unsigned long r8;
23 	unsigned long r9;
24 	unsigned long r10;
25 	unsigned long r11;
26 	unsigned long r12;
27 	unsigned long r13;
28 	unsigned long r14;
29 	unsigned long r15;
30 	unsigned long r16;
31 	unsigned long r17;
32 	unsigned long r18;
33 	unsigned long r19;
34 	unsigned long r20;
35 	unsigned long r21;
36 	unsigned long r22;
37 	unsigned long r23;
38 	unsigned long r24;
39 	unsigned long r25;
40 	unsigned long r26;
41 	unsigned long r27;	/* fp */
42 	unsigned long r28;	/* sp */
43 	unsigned long r29;
44 	unsigned long r30;
45 	unsigned long r31;	/* blink */
46 	unsigned long r63;	/* pc */
47 };
48 
49 struct unwind_frame_info {
50 	struct arc700_regs regs;
51 	struct task_struct *task;
52 	unsigned call_frame:1;
53 };
54 
55 #define UNW_PC(frame)		((frame)->regs.r63)
56 #define UNW_SP(frame)		((frame)->regs.r28)
57 #define UNW_BLINK(frame)	((frame)->regs.r31)
58 
59 /* Rajesh FIXME */
60 #ifdef CONFIG_FRAME_POINTER
61 #define UNW_FP(frame)		((frame)->regs.r27)
62 #define FRAME_RETADDR_OFFSET	4
63 #define FRAME_LINK_OFFSET	0
64 #define STACK_BOTTOM_UNW(tsk)	STACK_LIMIT((tsk)->thread.ksp)
65 #define STACK_TOP_UNW(tsk)	((tsk)->thread.ksp)
66 #else
67 #define UNW_FP(frame)		((void)(frame), 0)
68 #endif
69 
70 #define STACK_LIMIT(ptr)	(((ptr) - 1) & ~(THREAD_SIZE - 1))
71 
72 #define UNW_REGISTER_INFO \
73 	PTREGS_INFO(r0), \
74 	PTREGS_INFO(r1), \
75 	PTREGS_INFO(r2), \
76 	PTREGS_INFO(r3), \
77 	PTREGS_INFO(r4), \
78 	PTREGS_INFO(r5), \
79 	PTREGS_INFO(r6), \
80 	PTREGS_INFO(r7), \
81 	PTREGS_INFO(r8), \
82 	PTREGS_INFO(r9), \
83 	PTREGS_INFO(r10), \
84 	PTREGS_INFO(r11), \
85 	PTREGS_INFO(r12), \
86 	PTREGS_INFO(r13), \
87 	PTREGS_INFO(r14), \
88 	PTREGS_INFO(r15), \
89 	PTREGS_INFO(r16), \
90 	PTREGS_INFO(r17), \
91 	PTREGS_INFO(r18), \
92 	PTREGS_INFO(r19), \
93 	PTREGS_INFO(r20), \
94 	PTREGS_INFO(r21), \
95 	PTREGS_INFO(r22), \
96 	PTREGS_INFO(r23), \
97 	PTREGS_INFO(r24), \
98 	PTREGS_INFO(r25), \
99 	PTREGS_INFO(r26), \
100 	PTREGS_INFO(r27), \
101 	PTREGS_INFO(r28), \
102 	PTREGS_INFO(r29), \
103 	PTREGS_INFO(r30), \
104 	PTREGS_INFO(r31), \
105 	PTREGS_INFO(r63)
106 
107 #define UNW_DEFAULT_RA(raItem, dataAlign) \
108 	((raItem).where == Memory && !((raItem).value * (dataAlign) + 4))
109 
110 extern int arc_unwind(struct unwind_frame_info *frame);
111 extern void arc_unwind_init(void);
112 extern void *unwind_add_table(struct module *module, const void *table_start,
113 			      unsigned long table_size);
114 extern void unwind_remove_table(void *handle, int init_only);
115 
116 static inline int
arch_unwind_init_running(struct unwind_frame_info * info,int (* callback)(struct unwind_frame_info * info,void * arg),void * arg)117 arch_unwind_init_running(struct unwind_frame_info *info,
118 			 int (*callback) (struct unwind_frame_info *info,
119 					  void *arg),
120 			 void *arg)
121 {
122 	return 0;
123 }
124 
arch_unw_user_mode(const struct unwind_frame_info * info)125 static inline int arch_unw_user_mode(const struct unwind_frame_info *info)
126 {
127 	return 0;
128 }
129 
arch_unw_init_blocked(struct unwind_frame_info * info)130 static inline void arch_unw_init_blocked(struct unwind_frame_info *info)
131 {
132 	return;
133 }
134 
arch_unw_init_frame_info(struct unwind_frame_info * info,struct pt_regs * regs)135 static inline void arch_unw_init_frame_info(struct unwind_frame_info *info,
136 					    struct pt_regs *regs)
137 {
138 	return;
139 }
140 
141 #else
142 
143 #define UNW_PC(frame) ((void)(frame), 0)
144 #define UNW_SP(frame) ((void)(frame), 0)
145 #define UNW_FP(frame) ((void)(frame), 0)
146 
arc_unwind_init(void)147 static inline void arc_unwind_init(void)
148 {
149 }
150 
151 #define unwind_add_table(a, b, c)
152 #define unwind_remove_table(a, b)
153 
154 #endif /* CONFIG_ARC_DW2_UNWIND */
155 
156 #endif /* _ASM_ARC_UNWIND_H */
157