gdbstub.c

   1 /*
   2  * gdb server stub
   3  *
   4  * Copyright (c) 2003-2005 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 "config.h"
  21 #ifdef CONFIG_USER_ONLY
  22 #include <stdlib.h>
  23 #include <stdio.h>
  24 #include <stdarg.h>
  25 #include <string.h>
  26 #include <errno.h>
  27 #include <unistd.h>
  28 #include <fcntl.h>
  29
  30 #include "qemu.h"
  31 #else
  32 #include "vl.h"
  33 #endif
  34
  35 #include "qemu_socket.h"
  36 #ifdef _WIN32
  37 /* XXX: these constants may be independent of the host ones even for Unix */
  38 #ifndef SIGTRAP
  39 #define SIGTRAP 5
  40 #endif
  41 #ifndef SIGINT
  42 #define SIGINT 2
  43 #endif
  44 #else
  45 #include <signal.h>
  46 #endif
  47
  48 //#define DEBUG_GDB
  49
  50 enum RSState {
  51     RS_IDLE,
  52     RS_GETLINE,
  53     RS_CHKSUM1,
  54     RS_CHKSUM2,
  55 };
  56 /* XXX: This is not thread safe.  Do we care?  */
  57 static int gdbserver_fd = -1;
  58
  59 typedef struct GDBState {
  60     CPUState *env; /* current CPU */
  61     enum RSState state; /* parsing state */
  62     int fd;
  63     char line_buf[4096];
  64     int line_buf_index;
  65     int line_csum;
  66 #ifdef CONFIG_USER_ONLY
  67     int running_state;
  68 #endif
  69 } GDBState;
  70
  71 #ifdef CONFIG_USER_ONLY
  72 /* XXX: remove this hack.  */
  73 static GDBState gdbserver_state;
  74 #endif
  75
  76 static int get_char(GDBState *s)
  77 {
  78     uint8_t ch;
  79     int ret;
  80
  81     for(;;) {
  82         ret = recv(s->fd, &ch, 1, 0);
  83         if (ret < 0) {
  84             if (errno != EINTR && errno != EAGAIN)
  85                 return -1;
  86         } else if (ret == 0) {
  87             return -1;
  88         } else {
  89             break;
  90         }
  91     }
  92     return ch;
  93 }
  94
  95 static void put_buffer(GDBState *s, const uint8_t *buf, int len)
  96 {
  97     int ret;
  98
  99     while (len > 0) {
 100         ret = send(s->fd, buf, len, 0);
 101         if (ret < 0) {
 102             if (errno != EINTR && errno != EAGAIN)
 103                 return;
 104         } else {
 105             buf += ret;
 106             len -= ret;
 107         }
 108     }
 109 }
 110
 111 static inline int fromhex(int v)
 112 {
 113     if (v >= '0' && v <= '9')
 114         return v - '0';
 115     else if (v >= 'A' && v <= 'F')
 116         return v - 'A' + 10;
 117     else if (v >= 'a' && v <= 'f')
 118         return v - 'a' + 10;
 119     else
 120         return 0;
 121 }
 122
 123 static inline int tohex(int v)
 124 {
 125     if (v < 10)
 126         return v + '0';
 127     else
 128         return v - 10 + 'a';
 129 }
 130
 131 static void memtohex(char *buf, const uint8_t *mem, int len)
 132 {
 133     int i, c;
 134     char *q;
 135     q = buf;
 136     for(i = 0; i < len; i++) {
 137         c = mem[i];
 138         *q++ = tohex(c >> 4);
 139         *q++ = tohex(c & 0xf);
 140     }
 141     *q = '\0';
 142 }
 143
 144 static void hextomem(uint8_t *mem, const char *buf, int len)
 145 {
 146     int i;
 147
 148     for(i = 0; i < len; i++) {
 149         mem[i] = (fromhex(buf[0]) << 4) | fromhex(buf[1]);
 150         buf += 2;
 151     }
 152 }
 153
 154 /* return -1 if error, 0 if OK */
 155 static int put_packet(GDBState *s, char *buf)
 156 {
 157     char buf1[3];
 158     int len, csum, ch, i;
 159
 160 #ifdef DEBUG_GDB
 161     printf("reply='%s'\n", buf);
 162 #endif
 163
 164     for(;;) {
 165         buf1[0] = '$';
 166         put_buffer(s, buf1, 1);
 167         len = strlen(buf);
 168         put_buffer(s, buf, len);
 169         csum = 0;
 170         for(i = 0; i < len; i++) {
 171             csum += buf[i];
 172         }
 173         buf1[0] = '#';
 174         buf1[1] = tohex((csum >> 4) & 0xf);
 175         buf1[2] = tohex((csum) & 0xf);
 176
 177         put_buffer(s, buf1, 3);
 178
 179         ch = get_char(s);
 180         if (ch < 0)
 181             return -1;
 182         if (ch == '+')
 183             break;
 184     }
 185     return 0;
 186 }
 187
 188 #if defined(TARGET_I386)
 189
 190 static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
 191 {
 192     uint32_t *registers = (uint32_t *)mem_buf;
 193     int i, fpus;
 194
 195     for(i = 0; i < 8; i++) {
 196         registers[i] = env->regs[i];
 197     }
 198     registers[8] = env->eip;
 199     registers[9] = env->eflags;
 200     registers[10] = env->segs[R_CS].selector;
 201     registers[11] = env->segs[R_SS].selector;
 202     registers[12] = env->segs[R_DS].selector;
 203     registers[13] = env->segs[R_ES].selector;
 204     registers[14] = env->segs[R_FS].selector;
 205     registers[15] = env->segs[R_GS].selector;
 206     /* XXX: convert floats */
 207     for(i = 0; i < 8; i++) {
 208         memcpy(mem_buf + 16 * 4 + i * 10, &env->fpregs[i], 10);
 209     }
 210     registers[36] = env->fpuc;
 211     fpus = (env->fpus & ~0x3800) | (env->fpstt & 0x7) << 11;
 212     registers[37] = fpus;
 213     registers[38] = 0; /* XXX: convert tags */
 214     registers[39] = 0; /* fiseg */
 215     registers[40] = 0; /* fioff */
 216     registers[41] = 0; /* foseg */
 217     registers[42] = 0; /* fooff */
 218     registers[43] = 0; /* fop */
 219
 220     for(i = 0; i < 16; i++)
 221         tswapls(&registers[i]);
 222     for(i = 36; i < 44; i++)
 223         tswapls(&registers[i]);
 224     return 44 * 4;
 225 }
 226
 227 static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
 228 {
 229     uint32_t *registers = (uint32_t *)mem_buf;
 230     int i;
 231
 232     for(i = 0; i < 8; i++) {
 233         env->regs[i] = tswapl(registers[i]);
 234     }
 235     env->eip = tswapl(registers[8]);
 236     env->eflags = tswapl(registers[9]);
 237 #if defined(CONFIG_USER_ONLY)
 238 #define LOAD_SEG(index, sreg)\
 239             if (tswapl(registers[index]) != env->segs[sreg].selector)\
 240                 cpu_x86_load_seg(env, sreg, tswapl(registers[index]));
 241             LOAD_SEG(10, R_CS);
 242             LOAD_SEG(11, R_SS);
 243             LOAD_SEG(12, R_DS);
 244             LOAD_SEG(13, R_ES);
 245             LOAD_SEG(14, R_FS);
 246             LOAD_SEG(15, R_GS);
 247 #endif
 248 }
 249
 250 #elif defined (TARGET_PPC)
 251 static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
 252 {
 253     uint32_t *registers = (uint32_t *)mem_buf, tmp;
 254     int i;
 255
 256     /* fill in gprs */
 257     for(i = 0; i < 32; i++) {
 258         registers[i] = tswapl(env->gpr[i]);
 259     }
 260     /* fill in fprs */
 261     for (i = 0; i < 32; i++) {
 262         registers[(i * 2) + 32] = tswapl(*((uint32_t *)&env->fpr[i]));
 263         registers[(i * 2) + 33] = tswapl(*((uint32_t *)&env->fpr[i] + 1));
 264     }
 265     /* nip, msr, ccr, lnk, ctr, xer, mq */
 266     registers[96] = tswapl(env->nip);
 267     registers[97] = tswapl(do_load_msr(env));
 268     tmp = 0;
 269     for (i = 0; i < 8; i++)
 270         tmp |= env->crf[i] << (32 - ((i + 1) * 4));
 271     registers[98] = tswapl(tmp);
 272     registers[99] = tswapl(env->lr);
 273     registers[100] = tswapl(env->ctr);
 274     registers[101] = tswapl(do_load_xer(env));
 275     registers[102] = 0;
 276
 277     return 103 * 4;
 278 }
 279
 280 static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
 281 {
 282     uint32_t *registers = (uint32_t *)mem_buf;
 283     int i;
 284
 285     /* fill in gprs */
 286     for (i = 0; i < 32; i++) {
 287         env->gpr[i] = tswapl(registers[i]);
 288     }
 289     /* fill in fprs */
 290     for (i = 0; i < 32; i++) {
 291         *((uint32_t *)&env->fpr[i]) = tswapl(registers[(i * 2) + 32]);
 292         *((uint32_t *)&env->fpr[i] + 1) = tswapl(registers[(i * 2) + 33]);
 293     }
 294     /* nip, msr, ccr, lnk, ctr, xer, mq */
 295     env->nip = tswapl(registers[96]);
 296     do_store_msr(env, tswapl(registers[97]));
 297     registers[98] = tswapl(registers[98]);
 298     for (i = 0; i < 8; i++)
 299         env->crf[i] = (registers[98] >> (32 - ((i + 1) * 4))) & 0xF;
 300     env->lr = tswapl(registers[99]);
 301     env->ctr = tswapl(registers[100]);
 302     do_store_xer(env, tswapl(registers[101]));
 303 }
 304 #elif defined (TARGET_SPARC)
 305 static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
 306 {
 307     target_ulong *registers = (target_ulong *)mem_buf;
 308     int i;
 309
 310     /* fill in g0..g7 */
 311     for(i = 0; i < 8; i++) {
 312         registers[i] = tswapl(env->gregs[i]);
 313     }
 314     /* fill in register window */
 315     for(i = 0; i < 24; i++) {
 316         registers[i + 8] = tswapl(env->regwptr[i]);
 317     }
 318 #ifndef TARGET_SPARC64
 319     /* fill in fprs */
 320     for (i = 0; i < 32; i++) {
 321         registers[i + 32] = tswapl(*((uint32_t *)&env->fpr[i]));
 322     }
 323     /* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */
 324     registers[64] = tswapl(env->y);
 325     {
 326         target_ulong tmp;
 327
 328         tmp = GET_PSR(env);
 329         registers[65] = tswapl(tmp);
 330     }
 331     registers[66] = tswapl(env->wim);
 332     registers[67] = tswapl(env->tbr);
 333     registers[68] = tswapl(env->pc);
 334     registers[69] = tswapl(env->npc);
 335     registers[70] = tswapl(env->fsr);
 336     registers[71] = 0; /* csr */
 337     registers[72] = 0;
 338     return 73 * sizeof(target_ulong);
 339 #else
 340     /* fill in fprs */
 341     for (i = 0; i < 64; i += 2) {
 342         uint64_t tmp;
 343
 344         tmp = (uint64_t)tswap32(*((uint32_t *)&env->fpr[i])) << 32;
 345         tmp |= tswap32(*((uint32_t *)&env->fpr[i + 1]));
 346         registers[i/2 + 32] = tmp;
 347     }
 348     registers[64] = tswapl(env->pc);
 349     registers[65] = tswapl(env->npc);
 350     registers[66] = tswapl(env->tstate[env->tl]);
 351     registers[67] = tswapl(env->fsr);
 352     registers[68] = tswapl(env->fprs);
 353     registers[69] = tswapl(env->y);
 354     return 70 * sizeof(target_ulong);
 355 #endif
 356 }
 357
 358 static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
 359 {
 360     target_ulong *registers = (target_ulong *)mem_buf;
 361     int i;
 362
 363     /* fill in g0..g7 */
 364     for(i = 0; i < 7; i++) {
 365         env->gregs[i] = tswapl(registers[i]);
 366     }
 367     /* fill in register window */
 368     for(i = 0; i < 24; i++) {
 369         env->regwptr[i] = tswapl(registers[i + 8]);
 370     }
 371 #ifndef TARGET_SPARC64
 372     /* fill in fprs */
 373     for (i = 0; i < 32; i++) {
 374         *((uint32_t *)&env->fpr[i]) = tswapl(registers[i + 32]);
 375     }
 376     /* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */
 377     env->y = tswapl(registers[64]);
 378     PUT_PSR(env, tswapl(registers[65]));
 379     env->wim = tswapl(registers[66]);
 380     env->tbr = tswapl(registers[67]);
 381     env->pc = tswapl(registers[68]);
 382     env->npc = tswapl(registers[69]);
 383     env->fsr = tswapl(registers[70]);
 384 #else
 385     for (i = 0; i < 64; i += 2) {
 386         *((uint32_t *)&env->fpr[i]) = tswap32(registers[i/2 + 32] >> 32);
 387         *((uint32_t *)&env->fpr[i + 1]) = tswap32(registers[i/2 + 32] & 0xffffffff);
 388     }
 389     env->pc = tswapl(registers[64]);
 390     env->npc = tswapl(registers[65]);
 391     env->tstate[env->tl] = tswapl(registers[66]);
 392     env->fsr = tswapl(registers[67]);
 393     env->fprs = tswapl(registers[68]);
 394     env->y = tswapl(registers[69]);
 395 #endif
 396 }
 397 #elif defined (TARGET_ARM)
 398 static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
 399 {
 400     int i;
 401     uint8_t *ptr;
 402
 403     ptr = mem_buf;
 404     /* 16 core integer registers (4 bytes each).  */
 405     for (i = 0; i < 16; i++)
 406       {
 407         *(uint32_t *)ptr = tswapl(env->regs[i]);
 408         ptr += 4;
 409       }
 410     /* 8 FPA registers (12 bytes each), FPS (4 bytes).
 411        Not yet implemented.  */
 412     memset (ptr, 0, 8 * 12 + 4);
 413     ptr += 8 * 12 + 4;
 414     /* CPSR (4 bytes).  */
 415     *(uint32_t *)ptr = tswapl (cpsr_read(env));
 416     ptr += 4;
 417
 418     return ptr - mem_buf;
 419 }
 420
 421 static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
 422 {
 423     int i;
 424     uint8_t *ptr;
 425
 426     ptr = mem_buf;
 427     /* Core integer registers.  */
 428     for (i = 0; i < 16; i++)
 429       {
 430         env->regs[i] = tswapl(*(uint32_t *)ptr);
 431         ptr += 4;
 432       }
 433     /* Ignore FPA regs and scr.  */
 434     ptr += 8 * 12 + 4;
 435     cpsr_write (env, tswapl(*(uint32_t *)ptr), 0xffffffff);
 436 }
 437 #elif defined (TARGET_MIPS)
 438 static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
 439 {
 440     int i;
 441     uint8_t *ptr;
 442
 443     ptr = mem_buf;
 444     for (i = 0; i < 32; i++)
 445       {
 446         *(uint32_t *)ptr = tswapl(env->gpr[i]);
 447         ptr += 4;
 448       }
 449
 450     *(uint32_t *)ptr = tswapl(env->CP0_Status);
 451     ptr += 4;
 452
 453     *(uint32_t *)ptr = tswapl(env->LO);
 454     ptr += 4;
 455
 456     *(uint32_t *)ptr = tswapl(env->HI);
 457     ptr += 4;
 458
 459     *(uint32_t *)ptr = tswapl(env->CP0_BadVAddr);
 460     ptr += 4;
 461
 462     *(uint32_t *)ptr = tswapl(env->CP0_Cause);
 463     ptr += 4;
 464
 465     *(uint32_t *)ptr = tswapl(env->PC);
 466     ptr += 4;
 467
 468     /* 32 FP registers, fsr, fir, fp.  Not yet implemented.  */
 469
 470     return ptr - mem_buf;
 471 }
 472
 473 static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
 474 {
 475     int i;
 476     uint8_t *ptr;
 477
 478     ptr = mem_buf;
 479     for (i = 0; i < 32; i++)
 480       {
 481         env->gpr[i] = tswapl(*(uint32_t *)ptr);
 482         ptr += 4;
 483       }
 484
 485     env->CP0_Status = tswapl(*(uint32_t *)ptr);
 486     ptr += 4;
 487
 488     env->LO = tswapl(*(uint32_t *)ptr);
 489     ptr += 4;
 490
 491     env->HI = tswapl(*(uint32_t *)ptr);
 492     ptr += 4;
 493
 494     env->CP0_BadVAddr = tswapl(*(uint32_t *)ptr);
 495     ptr += 4;
 496
 497     env->CP0_Cause = tswapl(*(uint32_t *)ptr);
 498     ptr += 4;
 499
 500     env->PC = tswapl(*(uint32_t *)ptr);
 501     ptr += 4;
 502 }
 503 #elif defined (TARGET_SH4)
 504 static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
 505 {
 506   uint32_t *ptr = (uint32_t *)mem_buf;
 507   int i;
 508
 509 #define SAVE(x) *ptr++=tswapl(x)
 510   if ((env->sr & (SR_MD | SR_RB)) == (SR_MD | SR_RB)) {
 511       for (i = 0; i < 8; i++) SAVE(env->gregs[i + 16]);
 512   } else {
 513       for (i = 0; i < 8; i++) SAVE(env->gregs[i]);
 514   }
 515   for (i = 8; i < 16; i++) SAVE(env->gregs[i]);
 516   SAVE (env->pc);
 517   SAVE (env->pr);
 518   SAVE (env->gbr);
 519   SAVE (env->vbr);
 520   SAVE (env->mach);
 521   SAVE (env->macl);
 522   SAVE (env->sr);
 523   SAVE (0); /* TICKS */
 524   SAVE (0); /* STALLS */
 525   SAVE (0); /* CYCLES */
 526   SAVE (0); /* INSTS */
 527   SAVE (0); /* PLR */
 528
 529   return ((uint8_t *)ptr - mem_buf);
 530 }
 531
 532 static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
 533 {
 534   uint32_t *ptr = (uint32_t *)mem_buf;
 535   int i;
 536
 537 #define LOAD(x) (x)=*ptr++;
 538   if ((env->sr & (SR_MD | SR_RB)) == (SR_MD | SR_RB)) {
 539       for (i = 0; i < 8; i++) LOAD(env->gregs[i + 16]);
 540   } else {
 541       for (i = 0; i < 8; i++) LOAD(env->gregs[i]);
 542   }
 543   for (i = 8; i < 16; i++) LOAD(env->gregs[i]);
 544   LOAD (env->pc);
 545   LOAD (env->pr);
 546   LOAD (env->gbr);
 547   LOAD (env->vbr);
 548   LOAD (env->mach);
 549   LOAD (env->macl);
 550   LOAD (env->sr);
 551 }
 552 #else
 553 static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
 554 {
 555     return 0;
 556 }
 557
 558 static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
 559 {
 560 }
 561
 562 #endif
 563
 564 static int gdb_handle_packet(GDBState *s, CPUState *env, const char *line_buf)
 565 {
 566     const char *p;
 567     int ch, reg_size, type;
 568     char buf[4096];
 569     uint8_t mem_buf[2000];
 570     uint32_t *registers;
 571     target_ulong addr, len;
 572
 573 #ifdef DEBUG_GDB
 574     printf("command='%s'\n", line_buf);
 575 #endif
 576     p = line_buf;
 577     ch = *p++;
 578     switch(ch) {
 579     case '?':
 580         /* TODO: Make this return the correct value for user-mode.  */
 581         snprintf(buf, sizeof(buf), "S%02x", SIGTRAP);
 582         put_packet(s, buf);
 583         break;
 584     case 'c':
 585         if (*p != '\0') {
 586             addr = strtoull(p, (char **)&p, 16);
 587 #if defined(TARGET_I386)
 588             env->eip = addr;
 589 #elif defined (TARGET_PPC)
 590             env->nip = addr;
 591 #elif defined (TARGET_SPARC)
 592             env->pc = addr;
 593             env->npc = addr + 4;
 594 #elif defined (TARGET_ARM)
 595             env->regs[15] = addr;
 596 #elif defined (TARGET_SH4)
 597             env->pc = addr;
 598 #endif
 599         }
 600 #ifdef CONFIG_USER_ONLY
 601         s->running_state = 1;
 602 #else
 603         vm_start();
 604 #endif
 605         return RS_IDLE;
 606     case 's':
 607         if (*p != '\0') {
 608             addr = strtoul(p, (char **)&p, 16);
 609 #if defined(TARGET_I386)
 610             env->eip = addr;
 611 #elif defined (TARGET_PPC)
 612             env->nip = addr;
 613 #elif defined (TARGET_SPARC)
 614             env->pc = addr;
 615             env->npc = addr + 4;
 616 #elif defined (TARGET_ARM)
 617             env->regs[15] = addr;
 618 #elif defined (TARGET_SH4)
 619             env->pc = addr;
 620 #endif
 621         }
 622         cpu_single_step(env, 1);
 623 #ifdef CONFIG_USER_ONLY
 624         s->running_state = 1;
 625 #else
 626         vm_start();
 627 #endif
 628         return RS_IDLE;
 629     case 'g':
 630         reg_size = cpu_gdb_read_registers(env, mem_buf);
 631         memtohex(buf, mem_buf, reg_size);
 632         put_packet(s, buf);
 633         break;
 634     case 'G':
 635         registers = (void *)mem_buf;
 636         len = strlen(p) / 2;
 637         hextomem((uint8_t *)registers, p, len);
 638         cpu_gdb_write_registers(env, mem_buf, len);
 639         put_packet(s, "OK");
 640         break;
 641     case 'm':
 642         addr = strtoull(p, (char **)&p, 16);
 643         if (*p == ',')
 644             p++;
 645         len = strtoull(p, NULL, 16);
 646         if (cpu_memory_rw_debug(env, addr, mem_buf, len, 0) != 0) {
 647             put_packet (s, "E14");
 648         } else {
 649             memtohex(buf, mem_buf, len);
 650             put_packet(s, buf);
 651         }
 652         break;
 653     case 'M':
 654         addr = strtoull(p, (char **)&p, 16);
 655         if (*p == ',')
 656             p++;
 657         len = strtoull(p, (char **)&p, 16);
 658         if (*p == ':')
 659             p++;
 660         hextomem(mem_buf, p, len);
 661         if (cpu_memory_rw_debug(env, addr, mem_buf, len, 1) != 0)
 662             put_packet(s, "E14");
 663         else
 664             put_packet(s, "OK");
 665         break;
 666     case 'Z':
 667         type = strtoul(p, (char **)&p, 16);
 668         if (*p == ',')
 669             p++;
 670         addr = strtoull(p, (char **)&p, 16);
 671         if (*p == ',')
 672             p++;
 673         len = strtoull(p, (char **)&p, 16);
 674         if (type == 0 || type == 1) {
 675             if (cpu_breakpoint_insert(env, addr) < 0)
 676                 goto breakpoint_error;
 677             put_packet(s, "OK");
 678         } else {
 679         breakpoint_error:
 680             put_packet(s, "E22");
 681         }
 682         break;
 683     case 'z':
 684         type = strtoul(p, (char **)&p, 16);
 685         if (*p == ',')
 686             p++;
 687         addr = strtoull(p, (char **)&p, 16);
 688         if (*p == ',')
 689             p++;
 690         len = strtoull(p, (char **)&p, 16);
 691         if (type == 0 || type == 1) {
 692             cpu_breakpoint_remove(env, addr);
 693             put_packet(s, "OK");
 694         } else {
 695             goto breakpoint_error;
 696         }
 697         break;
 698 #ifdef CONFIG_USER_ONLY
 699     case 'q':
 700         if (strncmp(p, "Offsets", 7) == 0) {
 701             TaskState *ts = env->opaque;
 702
 703             sprintf(buf, "Text=%x;Data=%x;Bss=%x", ts->info->code_offset,
 704                 ts->info->data_offset, ts->info->data_offset);
 705             put_packet(s, buf);
 706             break;
 707         }
 708         /* Fall through.  */
 709 #endif
 710     default:
 711         //        unknown_command:
 712         /* put empty packet */
 713         buf[0] = '\0';
 714         put_packet(s, buf);
 715         break;
 716     }
 717     return RS_IDLE;
 718 }
 719
 720 extern void tb_flush(CPUState *env);
 721
 722 #ifndef CONFIG_USER_ONLY
 723 static void gdb_vm_stopped(void *opaque, int reason)
 724 {
 725     GDBState *s = opaque;
 726     char buf[256];
 727     int ret;
 728
 729     /* disable single step if it was enable */
 730     cpu_single_step(s->env, 0);
 731
 732     if (reason == EXCP_DEBUG) {
 733         tb_flush(s->env);
 734         ret = SIGTRAP;
 735     } else if (reason == EXCP_INTERRUPT) {
 736         ret = SIGINT;
 737     } else {
 738         ret = 0;
 739     }
 740     snprintf(buf, sizeof(buf), "S%02x", ret);
 741     put_packet(s, buf);
 742 }
 743 #endif
 744
 745 static void gdb_read_byte(GDBState *s, int ch)
 746 {
 747     CPUState *env = s->env;
 748     int i, csum;
 749     char reply[1];
 750
 751 #ifndef CONFIG_USER_ONLY
 752     if (vm_running) {
 753         /* when the CPU is running, we cannot do anything except stop
 754            it when receiving a char */
 755         vm_stop(EXCP_INTERRUPT);
 756     } else
 757 #endif
 758     {
 759         switch(s->state) {
 760         case RS_IDLE:
 761             if (ch == '$') {
 762                 s->line_buf_index = 0;
 763                 s->state = RS_GETLINE;
 764             }
 765             break;
 766         case RS_GETLINE:
 767             if (ch == '#') {
 768             s->state = RS_CHKSUM1;
 769             } else if (s->line_buf_index >= sizeof(s->line_buf) - 1) {
 770                 s->state = RS_IDLE;
 771             } else {
 772             s->line_buf[s->line_buf_index++] = ch;
 773             }
 774             break;
 775         case RS_CHKSUM1:
 776             s->line_buf[s->line_buf_index] = '\0';
 777             s->line_csum = fromhex(ch) << 4;
 778             s->state = RS_CHKSUM2;
 779             break;
 780         case RS_CHKSUM2:
 781             s->line_csum |= fromhex(ch);
 782             csum = 0;
 783             for(i = 0; i < s->line_buf_index; i++) {
 784                 csum += s->line_buf[i];
 785             }
 786             if (s->line_csum != (csum & 0xff)) {
 787                 reply[0] = '-';
 788                 put_buffer(s, reply, 1);
 789                 s->state = RS_IDLE;
 790             } else {
 791                 reply[0] = '+';
 792                 put_buffer(s, reply, 1);
 793                 s->state = gdb_handle_packet(s, env, s->line_buf);
 794             }
 795             break;
 796         }
 797     }
 798 }
 799
 800 #ifdef CONFIG_USER_ONLY
 801 int
 802 gdb_handlesig (CPUState *env, int sig)
 803 {
 804   GDBState *s;
 805   char buf[256];
 806   int n;
 807
 808   if (gdbserver_fd < 0)
 809     return sig;
 810
 811   s = &gdbserver_state;
 812
 813   /* disable single step if it was enabled */
 814   cpu_single_step(env, 0);
 815   tb_flush(env);
 816
 817   if (sig != 0)
 818     {
 819       snprintf(buf, sizeof(buf), "S%02x", sig);
 820       put_packet(s, buf);
 821     }
 822
 823   sig = 0;
 824   s->state = RS_IDLE;
 825   s->running_state = 0;
 826   while (s->running_state == 0) {
 827       n = read (s->fd, buf, 256);
 828       if (n > 0)
 829         {
 830           int i;
 831
 832           for (i = 0; i < n; i++)
 833             gdb_read_byte (s, buf[i]);
 834         }
 835       else if (n == 0 || errno != EAGAIN)
 836         {
 837           /* XXX: Connection closed.  Should probably wait for annother
 838              connection before continuing.  */
 839           return sig;
 840         }
 841   }
 842   return sig;
 843 }
 844
 845 /* Tell the remote gdb that the process has exited.  */
 846 void gdb_exit(CPUState *env, int code)
 847 {
 848   GDBState *s;
 849   char buf[4];
 850
 851   if (gdbserver_fd < 0)
 852     return;
 853
 854   s = &gdbserver_state;
 855
 856   snprintf(buf, sizeof(buf), "W%02x", code);
 857   put_packet(s, buf);
 858 }
 859
 860 #else
 861 static void gdb_read(void *opaque)
 862 {
 863     GDBState *s = opaque;
 864     int i, size;
 865     uint8_t buf[4096];
 866
 867     size = recv(s->fd, buf, sizeof(buf), 0);
 868     if (size < 0)
 869         return;
 870     if (size == 0) {
 871         /* end of connection */
 872         qemu_del_vm_stop_handler(gdb_vm_stopped, s);
 873         qemu_set_fd_handler(s->fd, NULL, NULL, NULL);
 874         qemu_free(s);
 875         vm_start();
 876     } else {
 877         for(i = 0; i < size; i++)
 878             gdb_read_byte(s, buf[i]);
 879     }
 880 }
 881
 882 #endif
 883
 884 static void gdb_accept(void *opaque)
 885 {
 886     GDBState *s;
 887     struct sockaddr_in sockaddr;
 888     socklen_t len;
 889     int val, fd;
 890
 891     for(;;) {
 892         len = sizeof(sockaddr);
 893         fd = accept(gdbserver_fd, (struct sockaddr *)&sockaddr, &len);
 894         if (fd < 0 && errno != EINTR) {
 895             perror("accept");
 896             return;
 897         } else if (fd >= 0) {
 898             break;
 899         }
 900     }
 901
 902     /* set short latency */
 903     val = 1;
 904     setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *)&val, sizeof(val));
 905
 906 #ifdef CONFIG_USER_ONLY
 907     s = &gdbserver_state;
 908     memset (s, 0, sizeof (GDBState));
 909 #else
 910     s = qemu_mallocz(sizeof(GDBState));
 911     if (!s) {
 912         close(fd);
 913         return;
 914     }
 915 #endif
 916     s->env = first_cpu; /* XXX: allow to change CPU */
 917     s->fd = fd;
 918
 919 #ifdef CONFIG_USER_ONLY
 920     fcntl(fd, F_SETFL, O_NONBLOCK);
 921 #else
 922     socket_set_nonblock(fd);
 923
 924     /* stop the VM */
 925     vm_stop(EXCP_INTERRUPT);
 926
 927     /* start handling I/O */
 928     qemu_set_fd_handler(s->fd, gdb_read, NULL, s);
 929     /* when the VM is stopped, the following callback is called */
 930     qemu_add_vm_stop_handler(gdb_vm_stopped, s);
 931 #endif
 932 }
 933
 934 static int gdbserver_open(int port)
 935 {
 936     struct sockaddr_in sockaddr;
 937     int fd, val, ret;
 938
 939     fd = socket(PF_INET, SOCK_STREAM, 0);
 940     if (fd < 0) {
 941         perror("socket");
 942         return -1;
 943     }
 944
 945     /* allow fast reuse */
 946     val = 1;
 947     setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&val, sizeof(val));
 948
 949     sockaddr.sin_family = AF_INET;
 950     sockaddr.sin_port = htons(port);
 951     sockaddr.sin_addr.s_addr = 0;
 952     ret = bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr));
 953     if (ret < 0) {
 954         perror("bind");
 955         return -1;
 956     }
 957     ret = listen(fd, 0);
 958     if (ret < 0) {
 959         perror("listen");
 960         return -1;
 961     }
 962 #ifndef CONFIG_USER_ONLY
 963     socket_set_nonblock(fd);
 964 #endif
 965     return fd;
 966 }
 967
 968 int gdbserver_start(int port)
 969 {
 970     gdbserver_fd = gdbserver_open(port);
 971     if (gdbserver_fd < 0)
 972         return -1;
 973     /* accept connections */
 974 #ifdef CONFIG_USER_ONLY
 975     gdb_accept (NULL);
 976 #else
 977     qemu_set_fd_handler(gdbserver_fd, gdb_accept, NULL, NULL);
 978 #endif
 979     return 0;
 980 }