bellard | b4608c0 | 2003-06-27 17:34:32 +0000 | [diff] [blame] | 1 | /* |
| 2 | * gdb server stub |
| 3 | * |
| 4 | * Copyright (c) 2003 Fabrice Bellard |
| 5 | * |
| 6 | * This library is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public |
| 8 | * License as published by the Free Software Foundation; either |
| 9 | * version 2 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * This library is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public |
| 17 | * License along with this library; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 | */ |
| 20 | #include <stdlib.h> |
| 21 | #include <stdio.h> |
| 22 | #include <string.h> |
| 23 | #include <unistd.h> |
| 24 | #include <errno.h> |
| 25 | #include <sys/socket.h> |
| 26 | #include <netinet/in.h> |
| 27 | #include <netinet/tcp.h> |
| 28 | #include <signal.h> |
| 29 | |
| 30 | #include "config.h" |
| 31 | #ifdef TARGET_I386 |
| 32 | #include "cpu-i386.h" |
| 33 | #endif |
| 34 | #ifdef TARGET_ARM |
| 35 | #include "cpu-arm.h" |
| 36 | #endif |
| 37 | #include "thunk.h" |
| 38 | #include "exec.h" |
| 39 | |
| 40 | //#define DEBUG_GDB |
| 41 | |
| 42 | int gdbstub_fd = -1; |
| 43 | |
| 44 | /* return 0 if OK */ |
| 45 | static int gdbstub_open(int port) |
| 46 | { |
| 47 | struct sockaddr_in sockaddr; |
| 48 | socklen_t len; |
| 49 | int fd, val, ret; |
| 50 | |
| 51 | fd = socket(PF_INET, SOCK_STREAM, 0); |
| 52 | if (fd < 0) { |
| 53 | perror("socket"); |
| 54 | return -1; |
| 55 | } |
| 56 | |
| 57 | /* allow fast reuse */ |
| 58 | val = 1; |
| 59 | setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val)); |
| 60 | |
| 61 | sockaddr.sin_family = AF_INET; |
| 62 | sockaddr.sin_port = htons(port); |
| 63 | sockaddr.sin_addr.s_addr = 0; |
| 64 | ret = bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr)); |
| 65 | if (ret < 0) { |
| 66 | perror("bind"); |
| 67 | return -1; |
| 68 | } |
| 69 | ret = listen(fd, 0); |
| 70 | if (ret < 0) { |
| 71 | perror("listen"); |
| 72 | return -1; |
| 73 | } |
| 74 | |
| 75 | /* now wait for one connection */ |
| 76 | for(;;) { |
| 77 | len = sizeof(sockaddr); |
| 78 | gdbstub_fd = accept(fd, (struct sockaddr *)&sockaddr, &len); |
| 79 | if (gdbstub_fd < 0 && errno != EINTR) { |
| 80 | perror("accept"); |
| 81 | return -1; |
| 82 | } else if (gdbstub_fd >= 0) { |
| 83 | break; |
| 84 | } |
| 85 | } |
| 86 | |
| 87 | /* set short latency */ |
| 88 | val = 1; |
| 89 | setsockopt(gdbstub_fd, SOL_TCP, TCP_NODELAY, &val, sizeof(val)); |
| 90 | return 0; |
| 91 | } |
| 92 | |
| 93 | static int get_char(void) |
| 94 | { |
| 95 | uint8_t ch; |
| 96 | int ret; |
| 97 | |
| 98 | for(;;) { |
| 99 | ret = read(gdbstub_fd, &ch, 1); |
| 100 | if (ret < 0) { |
| 101 | if (errno != EINTR && errno != EAGAIN) |
| 102 | return -1; |
| 103 | } else if (ret == 0) { |
| 104 | return -1; |
| 105 | } else { |
| 106 | break; |
| 107 | } |
| 108 | } |
| 109 | return ch; |
| 110 | } |
| 111 | |
| 112 | static void put_buffer(const uint8_t *buf, int len) |
| 113 | { |
| 114 | int ret; |
| 115 | |
| 116 | while (len > 0) { |
| 117 | ret = write(gdbstub_fd, buf, len); |
| 118 | if (ret < 0) { |
| 119 | if (errno != EINTR && errno != EAGAIN) |
| 120 | return; |
| 121 | } else { |
| 122 | buf += ret; |
| 123 | len -= ret; |
| 124 | } |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | static inline int fromhex(int v) |
| 129 | { |
| 130 | if (v >= '0' && v <= '9') |
| 131 | return v - '0'; |
| 132 | else if (v >= 'A' && v <= 'F') |
| 133 | return v - 'A' + 10; |
| 134 | else if (v >= 'a' && v <= 'f') |
| 135 | return v - 'a' + 10; |
| 136 | else |
| 137 | return 0; |
| 138 | } |
| 139 | |
| 140 | static inline int tohex(int v) |
| 141 | { |
| 142 | if (v < 10) |
| 143 | return v + '0'; |
| 144 | else |
| 145 | return v - 10 + 'a'; |
| 146 | } |
| 147 | |
| 148 | static void memtohex(char *buf, const uint8_t *mem, int len) |
| 149 | { |
| 150 | int i, c; |
| 151 | char *q; |
| 152 | q = buf; |
| 153 | for(i = 0; i < len; i++) { |
| 154 | c = mem[i]; |
| 155 | *q++ = tohex(c >> 4); |
| 156 | *q++ = tohex(c & 0xf); |
| 157 | } |
| 158 | *q = '\0'; |
| 159 | } |
| 160 | |
| 161 | static void hextomem(uint8_t *mem, const char *buf, int len) |
| 162 | { |
| 163 | int i; |
| 164 | |
| 165 | for(i = 0; i < len; i++) { |
| 166 | mem[i] = (fromhex(buf[0]) << 4) | fromhex(buf[1]); |
| 167 | buf += 2; |
| 168 | } |
| 169 | } |
| 170 | |
| 171 | /* return -1 if error or EOF */ |
| 172 | static int get_packet(char *buf, int buf_size) |
| 173 | { |
| 174 | int ch, len, csum, csum1; |
| 175 | char reply[1]; |
| 176 | |
| 177 | for(;;) { |
| 178 | for(;;) { |
| 179 | ch = get_char(); |
| 180 | if (ch < 0) |
| 181 | return -1; |
| 182 | if (ch == '$') |
| 183 | break; |
| 184 | } |
| 185 | len = 0; |
| 186 | csum = 0; |
| 187 | for(;;) { |
| 188 | ch = get_char(); |
| 189 | if (ch < 0) |
| 190 | return -1; |
| 191 | if (ch == '#') |
| 192 | break; |
| 193 | if (len > buf_size - 1) |
| 194 | return -1; |
| 195 | buf[len++] = ch; |
| 196 | csum += ch; |
| 197 | } |
| 198 | buf[len] = '\0'; |
| 199 | ch = get_char(); |
| 200 | if (ch < 0) |
| 201 | return -1; |
| 202 | csum1 = fromhex(ch) << 4; |
| 203 | ch = get_char(); |
| 204 | if (ch < 0) |
| 205 | return -1; |
| 206 | csum1 |= fromhex(ch); |
| 207 | if ((csum & 0xff) != csum1) { |
| 208 | reply[0] = '-'; |
| 209 | put_buffer(reply, 1); |
| 210 | } else { |
| 211 | reply[0] = '+'; |
| 212 | put_buffer(reply, 1); |
| 213 | break; |
| 214 | } |
| 215 | } |
| 216 | #ifdef DEBUG_GDB |
| 217 | printf("command='%s'\n", buf); |
| 218 | #endif |
| 219 | return len; |
| 220 | } |
| 221 | |
| 222 | /* return -1 if error, 0 if OK */ |
| 223 | static int put_packet(char *buf) |
| 224 | { |
| 225 | char buf1[3]; |
| 226 | int len, csum, ch, i; |
| 227 | |
| 228 | #ifdef DEBUG_GDB |
| 229 | printf("reply='%s'\n", buf); |
| 230 | #endif |
| 231 | |
| 232 | for(;;) { |
| 233 | buf1[0] = '$'; |
| 234 | put_buffer(buf1, 1); |
| 235 | len = strlen(buf); |
| 236 | put_buffer(buf, len); |
| 237 | csum = 0; |
| 238 | for(i = 0; i < len; i++) { |
| 239 | csum += buf[i]; |
| 240 | } |
| 241 | buf1[0] = '#'; |
| 242 | buf1[1] = tohex((csum >> 4) & 0xf); |
| 243 | buf1[2] = tohex((csum) & 0xf); |
| 244 | |
| 245 | put_buffer(buf1, 3); |
| 246 | |
| 247 | ch = get_char(); |
| 248 | if (ch < 0) |
| 249 | return -1; |
| 250 | if (ch == '+') |
| 251 | break; |
| 252 | } |
| 253 | return 0; |
| 254 | } |
| 255 | |
| 256 | static int memory_rw(uint8_t *buf, uint32_t addr, int len, int is_write) |
| 257 | { |
| 258 | int l, flags; |
| 259 | uint32_t page; |
| 260 | |
| 261 | while (len > 0) { |
| 262 | page = addr & TARGET_PAGE_MASK; |
| 263 | l = (page + TARGET_PAGE_SIZE) - addr; |
| 264 | if (l > len) |
| 265 | l = len; |
| 266 | flags = page_get_flags(page); |
| 267 | if (!(flags & PAGE_VALID)) |
| 268 | return -1; |
| 269 | if (is_write) { |
| 270 | if (!(flags & PAGE_WRITE)) |
| 271 | return -1; |
| 272 | memcpy((uint8_t *)addr, buf, l); |
| 273 | } else { |
| 274 | if (!(flags & PAGE_READ)) |
| 275 | return -1; |
| 276 | memcpy(buf, (uint8_t *)addr, l); |
| 277 | } |
| 278 | len -= l; |
| 279 | buf += l; |
| 280 | addr += l; |
| 281 | } |
| 282 | return 0; |
| 283 | } |
| 284 | |
| 285 | /* port = 0 means default port */ |
| 286 | int cpu_gdbstub(void *opaque, void (*main_loop)(void *opaque), int port) |
| 287 | { |
| 288 | CPUState *env; |
| 289 | const char *p; |
| 290 | int ret, ch, nb_regs, i; |
| 291 | char buf[4096]; |
| 292 | uint8_t mem_buf[2000]; |
| 293 | uint32_t *registers; |
| 294 | uint32_t addr, len; |
| 295 | |
| 296 | printf("Waiting gdb connection on port %d\n", port); |
| 297 | if (gdbstub_open(port) < 0) |
| 298 | return -1; |
| 299 | printf("Connected\n"); |
| 300 | for(;;) { |
| 301 | ret = get_packet(buf, sizeof(buf)); |
| 302 | if (ret < 0) |
| 303 | break; |
| 304 | p = buf; |
| 305 | ch = *p++; |
| 306 | switch(ch) { |
| 307 | case '?': |
| 308 | snprintf(buf, sizeof(buf), "S%02x", SIGTRAP); |
| 309 | put_packet(buf); |
| 310 | break; |
| 311 | case 'c': |
| 312 | main_loop(opaque); |
| 313 | snprintf(buf, sizeof(buf), "S%02x", 0); |
| 314 | put_packet(buf); |
| 315 | break; |
| 316 | case 'g': |
| 317 | env = cpu_gdbstub_get_env(opaque); |
| 318 | registers = (void *)mem_buf; |
| 319 | #if defined(TARGET_I386) |
| 320 | for(i = 0; i < 8; i++) { |
| 321 | registers[i] = tswapl(env->regs[i]); |
| 322 | } |
| 323 | registers[8] = env->eip; |
| 324 | registers[9] = env->eflags; |
| 325 | registers[10] = env->segs[R_CS].selector; |
| 326 | registers[11] = env->segs[R_SS].selector; |
| 327 | registers[12] = env->segs[R_DS].selector; |
| 328 | registers[13] = env->segs[R_ES].selector; |
| 329 | registers[14] = env->segs[R_FS].selector; |
| 330 | registers[15] = env->segs[R_GS].selector; |
| 331 | nb_regs = 16; |
| 332 | #endif |
| 333 | memtohex(buf, (const uint8_t *)registers, |
| 334 | sizeof(registers[0]) * nb_regs); |
| 335 | put_packet(buf); |
| 336 | break; |
| 337 | case 'G': |
| 338 | env = cpu_gdbstub_get_env(opaque); |
| 339 | registers = (void *)mem_buf; |
| 340 | #if defined(TARGET_I386) |
| 341 | hextomem((uint8_t *)registers, p, 16 * 4); |
| 342 | for(i = 0; i < 8; i++) { |
| 343 | env->regs[i] = tswapl(registers[i]); |
| 344 | } |
| 345 | env->eip = registers[8]; |
| 346 | env->eflags = registers[9]; |
| 347 | #define LOAD_SEG(index, sreg)\ |
| 348 | if (tswapl(registers[index]) != env->segs[sreg].selector)\ |
| 349 | cpu_x86_load_seg(env, sreg, tswapl(registers[index])); |
| 350 | LOAD_SEG(10, R_CS); |
| 351 | LOAD_SEG(11, R_SS); |
| 352 | LOAD_SEG(12, R_DS); |
| 353 | LOAD_SEG(13, R_ES); |
| 354 | LOAD_SEG(14, R_FS); |
| 355 | LOAD_SEG(15, R_GS); |
| 356 | #endif |
| 357 | put_packet("OK"); |
| 358 | break; |
| 359 | case 'm': |
| 360 | addr = strtoul(p, (char **)&p, 16); |
| 361 | if (*p == ',') |
| 362 | p++; |
| 363 | len = strtoul(p, NULL, 16); |
| 364 | if (memory_rw(mem_buf, addr, len, 0) != 0) |
| 365 | memset(mem_buf, 0, len); |
| 366 | memtohex(buf, mem_buf, len); |
| 367 | put_packet(buf); |
| 368 | break; |
| 369 | case 'M': |
| 370 | addr = strtoul(p, (char **)&p, 16); |
| 371 | if (*p == ',') |
| 372 | p++; |
| 373 | len = strtoul(p, (char **)&p, 16); |
| 374 | if (*p == ',') |
| 375 | p++; |
| 376 | hextomem(mem_buf, p, len); |
| 377 | if (memory_rw(mem_buf, addr, len, 1) != 0) |
| 378 | put_packet("ENN"); |
| 379 | else |
| 380 | put_packet("OK"); |
| 381 | break; |
| 382 | default: |
| 383 | /* put empty packet */ |
| 384 | buf[0] = '\0'; |
| 385 | put_packet(buf); |
| 386 | break; |
| 387 | } |
| 388 | } |
| 389 | return 0; |
| 390 | } |