1 /* Helper routines for libthread_db.
2 Copyright (C) 2003-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19 #include "thread_dbP.h"
20 #include <byteswap.h>
21 #include <assert.h>
22 #include <stdint.h>
23
24 td_err_e
25 _td_check_sizeof (td_thragent_t *ta, uint32_t *sizep, int sizep_name)
26 {
27 if (*sizep == 0)
28 {
29 psaddr_t descptr;
30 ps_err_e err = td_lookup (ta->ph, sizep_name, &descptr);
31 if (err == PS_NOSYM)
32 return TD_NOCAPAB;
33 if (err == PS_OK)
34 err = ps_pdread (ta->ph, descptr, sizep, sizeof *sizep);
35 if (err != PS_OK)
36 return TD_ERR;
37 if (*sizep & 0xff000000U)
38 *sizep = bswap_32 (*sizep);
39 }
40 return TD_OK;
41 }
42
43 td_err_e
44 _td_locate_field (td_thragent_t *ta,
45 db_desc_t desc, int descriptor_name,
46 psaddr_t idx, psaddr_t *address)
47 {
48 uint32_t elemsize;
49
50 if (DB_DESC_SIZE (desc) == 0)
51 {
52 /* Read the information about this field from the inferior. */
53 psaddr_t descptr;
54 ps_err_e err = td_lookup (ta->ph, descriptor_name, &descptr);
55 if (err == PS_NOSYM)
56 return TD_NOCAPAB;
57 if (err == PS_OK)
58 err = ps_pdread (ta->ph, descptr, desc, DB_SIZEOF_DESC);
59 if (err != PS_OK)
60 return TD_ERR;
61 if (DB_DESC_SIZE (desc) == 0)
62 return TD_DBERR;
63 if (DB_DESC_SIZE (desc) & 0xff000000U)
64 {
65 /* Byte-swap these words, though we leave the size word
66 in native order as the handy way to distinguish. */
67 DB_DESC_OFFSET (desc) = bswap_32 (DB_DESC_OFFSET (desc));
68 DB_DESC_NELEM (desc) = bswap_32 (DB_DESC_NELEM (desc));
69 }
70 }
71
72 if (idx != 0 && DB_DESC_NELEM (desc) != 0
73 && idx - (psaddr_t) 0 > DB_DESC_NELEM (desc))
74 /* This is an internal indicator to callers with nonzero IDX
75 that the IDX value is too big. */
76 return TD_NOAPLIC;
77
78 elemsize = DB_DESC_SIZE (desc);
79 if (elemsize & 0xff000000U)
80 elemsize = bswap_32 (elemsize);
81
82 *address += (int32_t) DB_DESC_OFFSET (desc);
83 *address += (elemsize / 8 * (idx - (psaddr_t) 0));
84 return TD_OK;
85 }
86
87 td_err_e
88 _td_fetch_value (td_thragent_t *ta,
89 db_desc_t desc, int descriptor_name,
90 psaddr_t idx, psaddr_t address,
91 psaddr_t *result)
92 {
93 ps_err_e err;
94 td_err_e terr = _td_locate_field (ta, desc, descriptor_name, idx, &address);
95 if (terr != TD_OK)
96 return terr;
97
98 if (DB_DESC_SIZE (desc) == 8 || DB_DESC_SIZE (desc) == bswap_32 (8))
99 {
100 uint8_t value;
101 err = ps_pdread (ta->ph, address, &value, sizeof value);
102 *result = (psaddr_t) 0 + value;
103 }
104 else if (DB_DESC_SIZE (desc) == 32)
105 {
106 uint32_t value;
107 err = ps_pdread (ta->ph, address, &value, sizeof value);
108 *result = (psaddr_t) 0 + value;
109 }
110 else if (DB_DESC_SIZE (desc) == 64)
111 {
112 uint64_t value;
113 if (sizeof (psaddr_t) < 8)
114 return TD_NOCAPAB;
115 err = ps_pdread (ta->ph, address, &value, sizeof value);
116 *result = (psaddr_t) 0 + value;
117 }
118 else if (DB_DESC_SIZE (desc) == bswap_32 (32))
119 {
120 uint32_t value;
121 err = ps_pdread (ta->ph, address, &value, sizeof value);
122 value = bswap_32 (value);
123 *result = (psaddr_t) 0 + value;
124 }
125 else if (DB_DESC_SIZE (desc) == bswap_32 (64))
126 {
127 uint64_t value;
128 if (sizeof (psaddr_t) < 8)
129 return TD_NOCAPAB;
130 err = ps_pdread (ta->ph, address, &value, sizeof value);
131 value = bswap_64 (value);
132 *result = (psaddr_t) 0 + value;
133 }
134 else
135 return TD_DBERR;
136
137 return err == PS_OK ? TD_OK : TD_ERR;
138 }
139
140
141 td_err_e
142 _td_store_value (td_thragent_t *ta,
143 db_desc_t desc, int descriptor_name, psaddr_t idx,
144 psaddr_t address, psaddr_t widened_value)
145 {
146 ps_err_e err;
147 td_err_e terr = _td_locate_field (ta, desc, descriptor_name, idx, &address);
148 if (terr != TD_OK)
149 return terr;
150
151 if (DB_DESC_SIZE (desc) == 8 || DB_DESC_SIZE (desc) == bswap_32 (8))
152 {
153 uint8_t value = widened_value - (psaddr_t) 0;
154 err = ps_pdwrite (ta->ph, address, &value, sizeof value);
155 }
156 else if (DB_DESC_SIZE (desc) == 32)
157 {
158 uint32_t value = widened_value - (psaddr_t) 0;
159 err = ps_pdwrite (ta->ph, address, &value, sizeof value);
160 }
161 else if (DB_DESC_SIZE (desc) == 64)
162 {
163 uint64_t value = widened_value - (psaddr_t) 0;
164 if (sizeof (psaddr_t) < 8)
165 return TD_NOCAPAB;
166 err = ps_pdwrite (ta->ph, address, &value, sizeof value);
167 }
168 else if (DB_DESC_SIZE (desc) == bswap_32 (32))
169 {
170 uint32_t value = widened_value - (psaddr_t) 0;
171 value = bswap_32 (value);
172 err = ps_pdwrite (ta->ph, address, &value, sizeof value);
173 }
174 else if (DB_DESC_SIZE (desc) == bswap_32 (64))
175 {
176 uint64_t value = widened_value - (psaddr_t) 0;
177 if (sizeof (psaddr_t) < 8)
178 return TD_NOCAPAB;
179 value = bswap_64 (value);
180 err = ps_pdwrite (ta->ph, address, &value, sizeof value);
181 }
182 else
183 return TD_DBERR;
184
185 return err == PS_OK ? TD_OK : TD_ERR;
186 }
187
188 td_err_e
189 _td_fetch_value_local (td_thragent_t *ta,
190 db_desc_t desc, int descriptor_name, psaddr_t idx,
191 void *address,
192 psaddr_t *result)
193 {
194 td_err_e terr = _td_locate_field (ta, desc, descriptor_name, idx, &address);
195 if (terr != TD_OK)
196 return terr;
197
198 if (DB_DESC_SIZE (desc) == 8 || DB_DESC_SIZE (desc) == bswap_32 (8))
199 {
200 uint8_t value;
201 memcpy (&value, address, sizeof value);
202 *result = (psaddr_t) 0 + value;
203 }
204 else if (DB_DESC_SIZE (desc) == 32)
205 {
206 uint32_t value;
207 memcpy (&value, address, sizeof value);
208 *result = (psaddr_t) 0 + value;
209 }
210 else if (DB_DESC_SIZE (desc) == 64)
211 {
212 uint64_t value;
213 if (sizeof (psaddr_t) < 8)
214 return TD_NOCAPAB;
215 memcpy (&value, address, sizeof value);
216 *result = (psaddr_t) 0 + value;
217 }
218 else if (DB_DESC_SIZE (desc) == bswap_32 (32))
219 {
220 uint32_t value;
221 memcpy (&value, address, sizeof value);
222 value = bswap_32 (value);
223 *result = (psaddr_t) 0 + value;
224 }
225 else if (DB_DESC_SIZE (desc) == bswap_32 (64))
226 {
227 uint64_t value;
228 if (sizeof (psaddr_t) < 8)
229 return TD_NOCAPAB;
230 memcpy (&value, address, sizeof value);
231 value = bswap_64 (value);
232 *result = (psaddr_t) 0 + value;
233 }
234 else
235 return TD_DBERR;
236
237 return TD_OK;
238 }
239
240
241 td_err_e
242 _td_store_value_local (td_thragent_t *ta,
243 db_desc_t desc, int descriptor_name, psaddr_t idx,
244 void *address, psaddr_t widened_value)
245 {
246 td_err_e terr = _td_locate_field (ta, desc, descriptor_name, idx, &address);
247 if (terr != TD_OK)
248 return terr;
249
250 if (DB_DESC_SIZE (desc) == 8 || DB_DESC_SIZE (desc) == bswap_32 (8))
251 {
252 uint8_t value = widened_value - (psaddr_t) 0;
253 memcpy (address, &value, sizeof value);
254 }
255 else if (DB_DESC_SIZE (desc) == 32)
256 {
257 uint32_t value = widened_value - (psaddr_t) 0;
258 memcpy (address, &value, sizeof value);
259 }
260 else if (DB_DESC_SIZE (desc) == 64)
261 {
262 uint64_t value = widened_value - (psaddr_t) 0;
263 if (sizeof (psaddr_t) < 8)
264 return TD_NOCAPAB;
265 memcpy (address, &value, sizeof value);
266 }
267 else if (DB_DESC_SIZE (desc) == bswap_32 (32))
268 {
269 uint32_t value = widened_value - (psaddr_t) 0;
270 value = bswap_32 (value);
271 memcpy (address, &value, sizeof value);
272 }
273 else if (DB_DESC_SIZE (desc) == bswap_32 (64))
274 {
275 uint64_t value = widened_value - (psaddr_t) 0;
276 if (sizeof (psaddr_t) < 8)
277 return TD_NOCAPAB;
278 value = bswap_64 (value);
279 memcpy (address, &value, sizeof value);
280 }
281 else
282 return TD_DBERR;
283
284 return TD_OK;
285 }