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d96bf49b AB |
1 | /* |
2 | * Target specific user-mode handling | |
3 | * | |
4 | * Copyright (c) 2003-2005 Fabrice Bellard | |
5 | * Copyright (c) 2022 Linaro Ltd | |
6 | * | |
7 | * SPDX-License-Identifier: LGPL-2.0+ | |
8 | */ | |
9 | ||
10 | #include "qemu/osdep.h" | |
11 | #include "exec/gdbstub.h" | |
12 | #include "qemu.h" | |
13 | #include "internals.h" | |
e282010b IL |
14 | #ifdef CONFIG_LINUX |
15 | #include "linux-user/loader.h" | |
16 | #include "linux-user/qemu.h" | |
17 | #endif | |
d96bf49b AB |
18 | |
19 | /* | |
20 | * Map target signal numbers to GDB protocol signal numbers and vice | |
21 | * versa. For user emulation's currently supported systems, we can | |
22 | * assume most signals are defined. | |
23 | */ | |
24 | ||
25 | static int gdb_signal_table[] = { | |
26 | 0, | |
27 | TARGET_SIGHUP, | |
28 | TARGET_SIGINT, | |
29 | TARGET_SIGQUIT, | |
30 | TARGET_SIGILL, | |
31 | TARGET_SIGTRAP, | |
32 | TARGET_SIGABRT, | |
33 | -1, /* SIGEMT */ | |
34 | TARGET_SIGFPE, | |
35 | TARGET_SIGKILL, | |
36 | TARGET_SIGBUS, | |
37 | TARGET_SIGSEGV, | |
38 | TARGET_SIGSYS, | |
39 | TARGET_SIGPIPE, | |
40 | TARGET_SIGALRM, | |
41 | TARGET_SIGTERM, | |
42 | TARGET_SIGURG, | |
43 | TARGET_SIGSTOP, | |
44 | TARGET_SIGTSTP, | |
45 | TARGET_SIGCONT, | |
46 | TARGET_SIGCHLD, | |
47 | TARGET_SIGTTIN, | |
48 | TARGET_SIGTTOU, | |
49 | TARGET_SIGIO, | |
50 | TARGET_SIGXCPU, | |
51 | TARGET_SIGXFSZ, | |
52 | TARGET_SIGVTALRM, | |
53 | TARGET_SIGPROF, | |
54 | TARGET_SIGWINCH, | |
55 | -1, /* SIGLOST */ | |
56 | TARGET_SIGUSR1, | |
57 | TARGET_SIGUSR2, | |
58 | #ifdef TARGET_SIGPWR | |
59 | TARGET_SIGPWR, | |
60 | #else | |
61 | -1, | |
62 | #endif | |
63 | -1, /* SIGPOLL */ | |
64 | -1, | |
65 | -1, | |
66 | -1, | |
67 | -1, | |
68 | -1, | |
69 | -1, | |
70 | -1, | |
71 | -1, | |
72 | -1, | |
73 | -1, | |
74 | -1, | |
75 | #ifdef __SIGRTMIN | |
76 | __SIGRTMIN + 1, | |
77 | __SIGRTMIN + 2, | |
78 | __SIGRTMIN + 3, | |
79 | __SIGRTMIN + 4, | |
80 | __SIGRTMIN + 5, | |
81 | __SIGRTMIN + 6, | |
82 | __SIGRTMIN + 7, | |
83 | __SIGRTMIN + 8, | |
84 | __SIGRTMIN + 9, | |
85 | __SIGRTMIN + 10, | |
86 | __SIGRTMIN + 11, | |
87 | __SIGRTMIN + 12, | |
88 | __SIGRTMIN + 13, | |
89 | __SIGRTMIN + 14, | |
90 | __SIGRTMIN + 15, | |
91 | __SIGRTMIN + 16, | |
92 | __SIGRTMIN + 17, | |
93 | __SIGRTMIN + 18, | |
94 | __SIGRTMIN + 19, | |
95 | __SIGRTMIN + 20, | |
96 | __SIGRTMIN + 21, | |
97 | __SIGRTMIN + 22, | |
98 | __SIGRTMIN + 23, | |
99 | __SIGRTMIN + 24, | |
100 | __SIGRTMIN + 25, | |
101 | __SIGRTMIN + 26, | |
102 | __SIGRTMIN + 27, | |
103 | __SIGRTMIN + 28, | |
104 | __SIGRTMIN + 29, | |
105 | __SIGRTMIN + 30, | |
106 | __SIGRTMIN + 31, | |
107 | -1, /* SIGCANCEL */ | |
108 | __SIGRTMIN, | |
109 | __SIGRTMIN + 32, | |
110 | __SIGRTMIN + 33, | |
111 | __SIGRTMIN + 34, | |
112 | __SIGRTMIN + 35, | |
113 | __SIGRTMIN + 36, | |
114 | __SIGRTMIN + 37, | |
115 | __SIGRTMIN + 38, | |
116 | __SIGRTMIN + 39, | |
117 | __SIGRTMIN + 40, | |
118 | __SIGRTMIN + 41, | |
119 | __SIGRTMIN + 42, | |
120 | __SIGRTMIN + 43, | |
121 | __SIGRTMIN + 44, | |
122 | __SIGRTMIN + 45, | |
123 | __SIGRTMIN + 46, | |
124 | __SIGRTMIN + 47, | |
125 | __SIGRTMIN + 48, | |
126 | __SIGRTMIN + 49, | |
127 | __SIGRTMIN + 50, | |
128 | __SIGRTMIN + 51, | |
129 | __SIGRTMIN + 52, | |
130 | __SIGRTMIN + 53, | |
131 | __SIGRTMIN + 54, | |
132 | __SIGRTMIN + 55, | |
133 | __SIGRTMIN + 56, | |
134 | __SIGRTMIN + 57, | |
135 | __SIGRTMIN + 58, | |
136 | __SIGRTMIN + 59, | |
137 | __SIGRTMIN + 60, | |
138 | __SIGRTMIN + 61, | |
139 | __SIGRTMIN + 62, | |
140 | __SIGRTMIN + 63, | |
141 | __SIGRTMIN + 64, | |
142 | __SIGRTMIN + 65, | |
143 | __SIGRTMIN + 66, | |
144 | __SIGRTMIN + 67, | |
145 | __SIGRTMIN + 68, | |
146 | __SIGRTMIN + 69, | |
147 | __SIGRTMIN + 70, | |
148 | __SIGRTMIN + 71, | |
149 | __SIGRTMIN + 72, | |
150 | __SIGRTMIN + 73, | |
151 | __SIGRTMIN + 74, | |
152 | __SIGRTMIN + 75, | |
153 | __SIGRTMIN + 76, | |
154 | __SIGRTMIN + 77, | |
155 | __SIGRTMIN + 78, | |
156 | __SIGRTMIN + 79, | |
157 | __SIGRTMIN + 80, | |
158 | __SIGRTMIN + 81, | |
159 | __SIGRTMIN + 82, | |
160 | __SIGRTMIN + 83, | |
161 | __SIGRTMIN + 84, | |
162 | __SIGRTMIN + 85, | |
163 | __SIGRTMIN + 86, | |
164 | __SIGRTMIN + 87, | |
165 | __SIGRTMIN + 88, | |
166 | __SIGRTMIN + 89, | |
167 | __SIGRTMIN + 90, | |
168 | __SIGRTMIN + 91, | |
169 | __SIGRTMIN + 92, | |
170 | __SIGRTMIN + 93, | |
171 | __SIGRTMIN + 94, | |
172 | __SIGRTMIN + 95, | |
173 | -1, /* SIGINFO */ | |
174 | -1, /* UNKNOWN */ | |
175 | -1, /* DEFAULT */ | |
176 | -1, | |
177 | -1, | |
178 | -1, | |
179 | -1, | |
180 | -1, | |
181 | -1 | |
182 | #endif | |
183 | }; | |
184 | ||
185 | int gdb_signal_to_target(int sig) | |
186 | { | |
187 | if (sig < ARRAY_SIZE(gdb_signal_table)) { | |
188 | return gdb_signal_table[sig]; | |
189 | } else { | |
190 | return -1; | |
191 | } | |
192 | } | |
193 | ||
194 | int gdb_target_signal_to_gdb(int sig) | |
195 | { | |
196 | int i; | |
197 | for (i = 0; i < ARRAY_SIZE(gdb_signal_table); i++) { | |
198 | if (gdb_signal_table[i] == sig) { | |
199 | return i; | |
200 | } | |
201 | } | |
202 | return GDB_SIGNAL_UNKNOWN; | |
203 | } | |
204 | ||
205 | int gdb_get_cpu_index(CPUState *cpu) | |
206 | { | |
207 | TaskState *ts = (TaskState *) cpu->opaque; | |
208 | return ts ? ts->ts_tid : -1; | |
209 | } | |
210 | ||
211 | /* | |
212 | * User-mode specific command helpers | |
213 | */ | |
214 | ||
215 | void gdb_handle_query_offsets(GArray *params, void *user_ctx) | |
216 | { | |
217 | TaskState *ts; | |
218 | ||
219 | ts = gdbserver_state.c_cpu->opaque; | |
220 | g_string_printf(gdbserver_state.str_buf, | |
221 | "Text=" TARGET_ABI_FMT_lx | |
222 | ";Data=" TARGET_ABI_FMT_lx | |
223 | ";Bss=" TARGET_ABI_FMT_lx, | |
224 | ts->info->code_offset, | |
225 | ts->info->data_offset, | |
226 | ts->info->data_offset); | |
227 | gdb_put_strbuf(); | |
228 | } | |
229 | ||
230 | #if defined(CONFIG_LINUX) | |
231 | /* Partial user only duplicate of helper in gdbstub.c */ | |
232 | static inline int target_memory_rw_debug(CPUState *cpu, target_ulong addr, | |
233 | uint8_t *buf, int len, bool is_write) | |
234 | { | |
235 | CPUClass *cc; | |
236 | cc = CPU_GET_CLASS(cpu); | |
237 | if (cc->memory_rw_debug) { | |
238 | return cc->memory_rw_debug(cpu, addr, buf, len, is_write); | |
239 | } | |
240 | return cpu_memory_rw_debug(cpu, addr, buf, len, is_write); | |
241 | } | |
242 | ||
243 | void gdb_handle_query_xfer_auxv(GArray *params, void *user_ctx) | |
244 | { | |
245 | TaskState *ts; | |
246 | unsigned long offset, len, saved_auxv, auxv_len; | |
247 | ||
248 | if (params->len < 2) { | |
249 | gdb_put_packet("E22"); | |
250 | return; | |
251 | } | |
252 | ||
253 | offset = get_param(params, 0)->val_ul; | |
254 | len = get_param(params, 1)->val_ul; | |
255 | ts = gdbserver_state.c_cpu->opaque; | |
256 | saved_auxv = ts->info->saved_auxv; | |
257 | auxv_len = ts->info->auxv_len; | |
258 | ||
259 | if (offset >= auxv_len) { | |
260 | gdb_put_packet("E00"); | |
261 | return; | |
262 | } | |
263 | ||
264 | if (len > (MAX_PACKET_LENGTH - 5) / 2) { | |
265 | len = (MAX_PACKET_LENGTH - 5) / 2; | |
266 | } | |
267 | ||
268 | if (len < auxv_len - offset) { | |
269 | g_string_assign(gdbserver_state.str_buf, "m"); | |
270 | } else { | |
271 | g_string_assign(gdbserver_state.str_buf, "l"); | |
272 | len = auxv_len - offset; | |
273 | } | |
274 | ||
275 | g_byte_array_set_size(gdbserver_state.mem_buf, len); | |
276 | if (target_memory_rw_debug(gdbserver_state.g_cpu, saved_auxv + offset, | |
277 | gdbserver_state.mem_buf->data, len, false)) { | |
278 | gdb_put_packet("E14"); | |
279 | return; | |
280 | } | |
281 | ||
282 | gdb_memtox(gdbserver_state.str_buf, | |
283 | (const char *)gdbserver_state.mem_buf->data, len); | |
284 | gdb_put_packet_binary(gdbserver_state.str_buf->str, | |
285 | gdbserver_state.str_buf->len, true); | |
286 | } | |
287 | #endif | |
e282010b IL |
288 | |
289 | static const char *get_filename_param(GArray *params, int i) | |
290 | { | |
291 | const char *hex_filename = get_param(params, i)->data; | |
292 | gdb_hextomem(gdbserver_state.mem_buf, hex_filename, | |
293 | strlen(hex_filename) / 2); | |
294 | g_byte_array_append(gdbserver_state.mem_buf, (const guint8 *)"", 1); | |
295 | return (const char *)gdbserver_state.mem_buf->data; | |
296 | } | |
297 | ||
298 | static void hostio_reply_with_data(const void *buf, size_t n) | |
299 | { | |
300 | g_string_printf(gdbserver_state.str_buf, "F%zx;", n); | |
301 | gdb_memtox(gdbserver_state.str_buf, buf, n); | |
302 | gdb_put_packet_binary(gdbserver_state.str_buf->str, | |
303 | gdbserver_state.str_buf->len, true); | |
304 | } | |
305 | ||
306 | void gdb_handle_v_file_open(GArray *params, void *user_ctx) | |
307 | { | |
308 | const char *filename = get_filename_param(params, 0); | |
309 | uint64_t flags = get_param(params, 1)->val_ull; | |
310 | uint64_t mode = get_param(params, 2)->val_ull; | |
311 | ||
312 | #ifdef CONFIG_LINUX | |
313 | int fd = do_guest_openat(gdbserver_state.g_cpu->env_ptr, 0, filename, | |
314 | flags, mode, false); | |
315 | #else | |
316 | int fd = open(filename, flags, mode); | |
317 | #endif | |
318 | if (fd < 0) { | |
319 | g_string_printf(gdbserver_state.str_buf, "F-1,%d", errno); | |
320 | } else { | |
321 | g_string_printf(gdbserver_state.str_buf, "F%d", fd); | |
322 | } | |
323 | gdb_put_strbuf(); | |
324 | } | |
325 | ||
326 | void gdb_handle_v_file_close(GArray *params, void *user_ctx) | |
327 | { | |
328 | int fd = get_param(params, 0)->val_ul; | |
329 | ||
330 | if (close(fd) == -1) { | |
331 | g_string_printf(gdbserver_state.str_buf, "F-1,%d", errno); | |
332 | gdb_put_strbuf(); | |
333 | return; | |
334 | } | |
335 | ||
336 | gdb_put_packet("F00"); | |
337 | } | |
338 | ||
339 | void gdb_handle_v_file_pread(GArray *params, void *user_ctx) | |
340 | { | |
341 | int fd = get_param(params, 0)->val_ul; | |
342 | size_t count = get_param(params, 1)->val_ull; | |
343 | off_t offset = get_param(params, 2)->val_ull; | |
344 | ||
345 | size_t bufsiz = MIN(count, BUFSIZ); | |
346 | g_autofree char *buf = g_try_malloc(bufsiz); | |
347 | if (buf == NULL) { | |
348 | gdb_put_packet("E12"); | |
349 | return; | |
350 | } | |
351 | ||
352 | ssize_t n = pread(fd, buf, bufsiz, offset); | |
353 | if (n < 0) { | |
354 | g_string_printf(gdbserver_state.str_buf, "F-1,%d", errno); | |
355 | gdb_put_strbuf(); | |
356 | return; | |
357 | } | |
358 | hostio_reply_with_data(buf, n); | |
359 | } | |
360 | ||
361 | void gdb_handle_v_file_readlink(GArray *params, void *user_ctx) | |
362 | { | |
363 | const char *filename = get_filename_param(params, 0); | |
364 | ||
365 | g_autofree char *buf = g_try_malloc(BUFSIZ); | |
366 | if (buf == NULL) { | |
367 | gdb_put_packet("E12"); | |
368 | return; | |
369 | } | |
370 | ||
371 | #ifdef CONFIG_LINUX | |
372 | ssize_t n = do_guest_readlink(filename, buf, BUFSIZ); | |
373 | #else | |
374 | ssize_t n = readlink(filename, buf, BUFSIZ); | |
375 | #endif | |
376 | if (n < 0) { | |
377 | g_string_printf(gdbserver_state.str_buf, "F-1,%d", errno); | |
378 | gdb_put_strbuf(); | |
379 | return; | |
380 | } | |
381 | hostio_reply_with_data(buf, n); | |
382 | } | |
383 | ||
384 | void gdb_handle_query_xfer_exec_file(GArray *params, void *user_ctx) | |
385 | { | |
386 | uint32_t pid = get_param(params, 0)->val_ul; | |
387 | uint32_t offset = get_param(params, 1)->val_ul; | |
388 | uint32_t length = get_param(params, 2)->val_ul; | |
389 | ||
390 | GDBProcess *process = gdb_get_process(pid); | |
391 | if (!process) { | |
392 | gdb_put_packet("E00"); | |
393 | return; | |
394 | } | |
395 | ||
396 | CPUState *cpu = gdb_get_first_cpu_in_process(process); | |
397 | if (!cpu) { | |
398 | gdb_put_packet("E00"); | |
399 | return; | |
400 | } | |
401 | ||
402 | TaskState *ts = cpu->opaque; | |
403 | if (!ts || !ts->bprm || !ts->bprm->filename) { | |
404 | gdb_put_packet("E00"); | |
405 | return; | |
406 | } | |
407 | ||
408 | size_t total_length = strlen(ts->bprm->filename); | |
409 | if (offset > total_length) { | |
410 | gdb_put_packet("E00"); | |
411 | return; | |
412 | } | |
413 | if (offset + length > total_length) { | |
414 | length = total_length - offset; | |
415 | } | |
416 | ||
417 | g_string_printf(gdbserver_state.str_buf, "l%.*s", length, | |
418 | ts->bprm->filename + offset); | |
419 | gdb_put_strbuf(); | |
420 | } |