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 #define WSIZE (sizeof (unw_word_t))
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 unw_word_t val, aligned_addr = *addr & -WSIZE, off = *addr - aligned_addr;
15 int ret;
16
17 *addr += 1;
18
19 ret = (*a->access_mem) (as, aligned_addr, &val, 0, arg);
20
21 #if __BYTE_ORDER == __LITTLE_ENDIAN
22 val >>= 8*off;
23 #else
24 val >>= 8*(WSIZE - 1 - off);
25 #endif
26 *valp = val & 0xff;
27 return ret;
28 }
29
30 static inline int
fetch16(unw_addr_space_t as,unw_accessors_t * a,unw_word_t * addr,int16_t * valp,void * arg)31 fetch16 (unw_addr_space_t as, unw_accessors_t *a,
32 unw_word_t *addr, int16_t *valp, void *arg)
33 {
34 unw_word_t val, aligned_addr = *addr & -WSIZE, off = *addr - aligned_addr;
35 int ret;
36
37 assert ((off & 0x1) == 0);
38
39 *addr += 2;
40
41 ret = (*a->access_mem) (as, aligned_addr, &val, 0, arg);
42
43 #if __BYTE_ORDER == __LITTLE_ENDIAN
44 val >>= 8*off;
45 #else
46 val >>= 8*(WSIZE - 2 - off);
47 #endif
48 *valp = val & 0xffff;
49 return ret;
50 }
51
52 static inline int
fetch32(unw_addr_space_t as,unw_accessors_t * a,unw_word_t * addr,int32_t * valp,void * arg)53 fetch32 (unw_addr_space_t as, unw_accessors_t *a,
54 unw_word_t *addr, int32_t *valp, void *arg)
55 {
56 unw_word_t val, aligned_addr = *addr & -WSIZE, off = *addr - aligned_addr;
57 int ret;
58
59 assert ((off & 0x3) == 0);
60
61 *addr += 4;
62
63 ret = (*a->access_mem) (as, aligned_addr, &val, 0, arg);
64
65 #if __BYTE_ORDER == __LITTLE_ENDIAN
66 val >>= 8*off;
67 #else
68 val >>= 8*(WSIZE - 4 - off);
69 #endif
70 *valp = val & 0xffffffff;
71 return ret;
72 }
73
74 static inline int
fetchw(unw_addr_space_t as,unw_accessors_t * a,unw_word_t * addr,unw_word_t * valp,void * arg)75 fetchw (unw_addr_space_t as, unw_accessors_t *a,
76 unw_word_t *addr, unw_word_t *valp, void *arg)
77 {
78 int ret;
79
80 ret = (*a->access_mem) (as, *addr, valp, 0, arg);
81 *addr += WSIZE;
82 return ret;
83 }
84
85 #endif /* REMOTE_H */
86