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
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
125 static inline int arch_unw_user_mode(const struct unwind_frame_info *info)
126 {
127 return 0;
128 }
129
130 static inline void arch_unw_init_blocked(struct unwind_frame_info *info)
131 {
132 return;
133 }
134
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
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
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