1 #ifndef REMOTE_H
2 #define REMOTE_H
3
4 /* Helper functions for accessing (remote) memory. These functions
5 assume that all addresses are naturally aligned (e.g., 32-bit
6 quantity is stored at a 32-bit-aligned address. */
7
8 #ifdef UNW_LOCAL_ONLY
9
10 static inline int
fetch8(unw_addr_space_t as,unw_accessors_t * a,unw_word_t * addr,int8_t * valp,void * arg)11 fetch8 (unw_addr_space_t as, unw_accessors_t *a,
12 unw_word_t *addr, int8_t *valp, void *arg)
13 {
14 *valp = *(int8_t *) (uintptr_t) *addr;
15 *addr += 1;
16 return 0;
17 }
18
19 static inline int
fetch16(unw_addr_space_t as,unw_accessors_t * a,unw_word_t * addr,int16_t * valp,void * arg)20 fetch16 (unw_addr_space_t as, unw_accessors_t *a,
21 unw_word_t *addr, int16_t *valp, void *arg)
22 {
23 *valp = *(int16_t *) (uintptr_t) *addr;
24 *addr += 2;
25 return 0;
26 }
27
28 static inline int
fetch32(unw_addr_space_t as,unw_accessors_t * a,unw_word_t * addr,int32_t * valp,void * arg)29 fetch32 (unw_addr_space_t as, unw_accessors_t *a,
30 unw_word_t *addr, int32_t *valp, void *arg)
31 {
32 *valp = *(int32_t *) (uintptr_t) *addr;
33 *addr += 4;
34 return 0;
35 }
36
37 static inline int
fetchw(unw_addr_space_t as,unw_accessors_t * a,unw_word_t * addr,unw_word_t * valp,void * arg)38 fetchw (unw_addr_space_t as, unw_accessors_t *a,
39 unw_word_t *addr, unw_word_t *valp, void *arg)
40 {
41 *valp = *(unw_word_t *) (uintptr_t) *addr;
42 *addr += sizeof (unw_word_t);
43 return 0;
44 }
45
46 #else /* !UNW_LOCAL_ONLY */
47
48 #define WSIZE (sizeof (unw_word_t))
49
50 static inline int
fetch8(unw_addr_space_t as,unw_accessors_t * a,unw_word_t * addr,int8_t * valp,void * arg)51 fetch8 (unw_addr_space_t as, unw_accessors_t *a,
52 unw_word_t *addr, int8_t *valp, void *arg)
53 {
54 unw_word_t val, aligned_addr = *addr & -WSIZE, off = *addr - aligned_addr;
55 int ret;
56
57 *addr += 1;
58
59 ret = (*a->access_mem) (as, aligned_addr, &val, 0, arg);
60
61 #if UNW_BYTE_ORDER == UNW_LITTLE_ENDIAN
62 val >>= 8*off;
63 #else
64 val >>= 8*(WSIZE - 1 - off);
65 #endif
66 *valp = val & 0xff;
67 return ret;
68 }
69
70 static inline int
fetch16(unw_addr_space_t as,unw_accessors_t * a,unw_word_t * addr,int16_t * valp,void * arg)71 fetch16 (unw_addr_space_t as, unw_accessors_t *a,
72 unw_word_t *addr, int16_t *valp, void *arg)
73 {
74 unw_word_t val, aligned_addr = *addr & -WSIZE, off = *addr - aligned_addr;
75 int ret;
76
77 if ((off & 0x1) != 0)
78 return -UNW_EINVAL;
79
80 *addr += 2;
81
82 ret = (*a->access_mem) (as, aligned_addr, &val, 0, arg);
83
84 #if UNW_BYTE_ORDER == UNW_LITTLE_ENDIAN
85 val >>= 8*off;
86 #else
87 val >>= 8*(WSIZE - 2 - off);
88 #endif
89 *valp = val & 0xffff;
90 return ret;
91 }
92
93 static inline int
fetch32(unw_addr_space_t as,unw_accessors_t * a,unw_word_t * addr,int32_t * valp,void * arg)94 fetch32 (unw_addr_space_t as, unw_accessors_t *a,
95 unw_word_t *addr, int32_t *valp, void *arg)
96 {
97 unw_word_t val, aligned_addr = *addr & -WSIZE, off = *addr - aligned_addr;
98 int ret;
99
100 if ((off & 0x3) != 0)
101 return -UNW_EINVAL;
102
103 *addr += 4;
104
105 ret = (*a->access_mem) (as, aligned_addr, &val, 0, arg);
106
107 #if UNW_BYTE_ORDER == UNW_LITTLE_ENDIAN
108 val >>= 8*off;
109 #else
110 val >>= 8*(WSIZE - 4 - off);
111 #endif
112 *valp = val & 0xffffffff;
113 return ret;
114 }
115
116 static inline int
fetchw(unw_addr_space_t as,unw_accessors_t * a,unw_word_t * addr,unw_word_t * valp,void * arg)117 fetchw (unw_addr_space_t as, unw_accessors_t *a,
118 unw_word_t *addr, unw_word_t *valp, void *arg)
119 {
120 int ret;
121
122 ret = (*a->access_mem) (as, *addr, valp, 0, arg);
123 *addr += WSIZE;
124 return ret;
125 }
126
127 #endif /* !UNW_LOCAL_ONLY */
128
129 #endif /* REMOTE_H */
130