1 /* libunwind - a platform-independent unwind library
2 Copyright (C) 2008 CodeSourcery
3 Copyright (C) 2012 Tommi Rantala <tt.rantala@gmail.com>
4
5 This file is part of libunwind.
6
7 Permission is hereby granted, free of charge, to any person obtaining
8 a copy of this software and associated documentation files (the
9 "Software"), to deal in the Software without restriction, including
10 without limitation the rights to use, copy, modify, merge, publish,
11 distribute, sublicense, and/or sell copies of the Software, and to
12 permit persons to whom the Software is furnished to do so, subject to
13 the following conditions:
14
15 The above copyright notice and this permission notice shall be
16 included in all copies or substantial portions of the Software.
17
18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
19 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
21 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
22 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
23 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
24 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
25
26 #include <stdlib.h>
27 #include <string.h>
28
29 #include "unwind_i.h"
30
31 #ifdef UNW_REMOTE_ONLY
32
33 /* unw_local_addr_space is a NULL pointer in this case. */
34 unw_addr_space_t unw_local_addr_space;
35
36 #else /* !UNW_REMOTE_ONLY */
37
38 static struct unw_addr_space local_addr_space;
39
40 unw_addr_space_t unw_local_addr_space = &local_addr_space;
41
42 static inline void *
uc_addr(ucontext_t * uc,int reg)43 uc_addr (ucontext_t *uc, int reg)
44 {
45 if (reg >= UNW_SH_R0 && reg <= UNW_SH_PR)
46 return &uc->uc_mcontext.gregs[reg];
47 else
48 return NULL;
49 }
50
51 # ifdef UNW_LOCAL_ONLY
52
53 HIDDEN void *
tdep_uc_addr(ucontext_t * uc,int reg)54 tdep_uc_addr (ucontext_t *uc, int reg)
55 {
56 return uc_addr (uc, reg);
57 }
58
59 # endif /* UNW_LOCAL_ONLY */
60
61 static void
put_unwind_info(unw_addr_space_t as,unw_proc_info_t * proc_info,void * arg)62 put_unwind_info (unw_addr_space_t as, unw_proc_info_t *proc_info, void *arg)
63 {
64 /* it's a no-op */
65 }
66
67 static int
get_dyn_info_list_addr(unw_addr_space_t as,unw_word_t * dyn_info_list_addr,void * arg)68 get_dyn_info_list_addr (unw_addr_space_t as, unw_word_t *dyn_info_list_addr,
69 void *arg)
70 {
71 #ifndef UNW_LOCAL_ONLY
72 # pragma weak _U_dyn_info_list_addr
73 if (!_U_dyn_info_list_addr)
74 return -UNW_ENOINFO;
75 #endif
76 // Access the `_U_dyn_info_list` from `LOCAL_ONLY` library, i.e. libunwind.so.
77 *dyn_info_list_addr = _U_dyn_info_list_addr ();
78 return 0;
79 }
80
81 static int
access_mem(unw_addr_space_t as,unw_word_t addr,unw_word_t * val,int write,void * arg)82 access_mem (unw_addr_space_t as, unw_word_t addr, unw_word_t *val, int write,
83 void *arg)
84 {
85 if (write)
86 {
87 Debug (16, "mem[%x] <- %x\n", addr, *val);
88 *(unw_word_t *) addr = *val;
89 }
90 else
91 {
92 *val = *(unw_word_t *) addr;
93 Debug (16, "mem[%x] -> %x\n", addr, *val);
94 }
95 return 0;
96 }
97
98 static int
access_reg(unw_addr_space_t as,unw_regnum_t reg,unw_word_t * val,int write,void * arg)99 access_reg (unw_addr_space_t as, unw_regnum_t reg, unw_word_t *val, int write,
100 void *arg)
101 {
102 unw_word_t *addr;
103 ucontext_t *uc = arg;
104
105 if (unw_is_fpreg (reg))
106 goto badreg;
107
108 if (!(addr = uc_addr (uc, reg)))
109 goto badreg;
110
111 if (write)
112 {
113 *(unw_word_t *) addr = *val;
114 Debug (12, "%s <- %x\n", unw_regname (reg), *val);
115 }
116 else
117 {
118 *val = *(unw_word_t *) addr;
119 Debug (12, "%s -> %x\n", unw_regname (reg), *val);
120 }
121 return 0;
122
123 badreg:
124 Debug (1, "bad register number %u\n", reg);
125 return -UNW_EBADREG;
126 }
127
128 static int
access_fpreg(unw_addr_space_t as,unw_regnum_t reg,unw_fpreg_t * val,int write,void * arg)129 access_fpreg (unw_addr_space_t as, unw_regnum_t reg, unw_fpreg_t *val,
130 int write, void *arg)
131 {
132 ucontext_t *uc = arg;
133 unw_fpreg_t *addr;
134
135 if (!unw_is_fpreg (reg))
136 goto badreg;
137
138 if (!(addr = uc_addr (uc, reg)))
139 goto badreg;
140
141 if (write)
142 {
143 Debug (12, "%s <- %08lx.%08lx.%08lx\n", unw_regname (reg),
144 ((long *)val)[0], ((long *)val)[1], ((long *)val)[2]);
145 *(unw_fpreg_t *) addr = *val;
146 }
147 else
148 {
149 *val = *(unw_fpreg_t *) addr;
150 Debug (12, "%s -> %08lx.%08lx.%08lx\n", unw_regname (reg),
151 ((long *)val)[0], ((long *)val)[1], ((long *)val)[2]);
152 }
153 return 0;
154
155 badreg:
156 Debug (1, "bad register number %u\n", reg);
157 /* attempt to access a non-preserved register */
158 return -UNW_EBADREG;
159 }
160
161 static int
get_static_proc_name(unw_addr_space_t as,unw_word_t ip,char * buf,size_t buf_len,unw_word_t * offp,void * arg)162 get_static_proc_name (unw_addr_space_t as, unw_word_t ip,
163 char *buf, size_t buf_len, unw_word_t *offp,
164 void *arg)
165 {
166 return _Uelf32_get_proc_name (as, getpid (), ip, buf, buf_len, offp);
167 }
168
169 HIDDEN void
sh_local_addr_space_init(void)170 sh_local_addr_space_init (void)
171 {
172 memset (&local_addr_space, 0, sizeof (local_addr_space));
173 local_addr_space.caching_policy = UNWI_DEFAULT_CACHING_POLICY;
174 local_addr_space.acc.find_proc_info = dwarf_find_proc_info;
175 local_addr_space.acc.put_unwind_info = put_unwind_info;
176 local_addr_space.acc.get_dyn_info_list_addr = get_dyn_info_list_addr;
177 local_addr_space.acc.access_mem = access_mem;
178 local_addr_space.acc.access_reg = access_reg;
179 local_addr_space.acc.access_fpreg = access_fpreg;
180 local_addr_space.acc.resume = sh_local_resume;
181 local_addr_space.acc.get_proc_name = get_static_proc_name;
182 unw_flush_cache (&local_addr_space, 0, 0);
183 }
184
185 #endif /* !UNW_REMOTE_ONLY */
186