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     RS_SYSCALL,
  56 };
  57 typedef struct GDBState {
  58     CPUState *env; /* current CPU */
  59     enum RSState state; /* parsing state */
  60     char line_buf[4096];
  61     int line_buf_index;
  62     int line_csum;
  63     char last_packet[4100];
  64     int last_packet_len;
  65 #ifdef CONFIG_USER_ONLY
  66     int fd;
  67     int running_state;
  68 #else
  69     CharDriverState *chr;
  70 #endif
  71 } GDBState;
  72
  73 #ifdef CONFIG_USER_ONLY
  74 /* XXX: This is not thread safe.  Do we care?  */
  75 static int gdbserver_fd = -1;
  76
  77 /* XXX: remove this hack.  */
  78 static GDBState gdbserver_state;
  79
  80 static int get_char(GDBState *s)
  81 {
  82     uint8_t ch;
  83     int ret;
  84
  85     for(;;) {
  86         ret = recv(s->fd, &ch, 1, 0);
  87         if (ret < 0) {
  88             if (errno != EINTR && errno != EAGAIN)
  89                 return -1;
  90         } else if (ret == 0) {
  91             return -1;
  92         } else {
  93             break;
  94         }
  95     }
  96     return ch;
  97 }
  98 #endif
  99
 100 /* GDB stub state for use by semihosting syscalls.  */
 101 static GDBState *gdb_syscall_state;
 102 static gdb_syscall_complete_cb gdb_current_syscall_cb;
 103
 104 enum {
 105     GDB_SYS_UNKNOWN,
 106     GDB_SYS_ENABLED,
 107     GDB_SYS_DISABLED,
 108 } gdb_syscall_mode;
 109
 110 /* If gdb is connected when the first semihosting syscall occurs then use
 111    remote gdb syscalls.  Otherwise use native file IO.  */
 112 int use_gdb_syscalls(void)
 113 {
 114     if (gdb_syscall_mode == GDB_SYS_UNKNOWN) {
 115         gdb_syscall_mode = (gdb_syscall_state ? GDB_SYS_ENABLED
 116                                               : GDB_SYS_DISABLED);
 117     }
 118     return gdb_syscall_mode == GDB_SYS_ENABLED;
 119 }
 120
 121 static void put_buffer(GDBState *s, const uint8_t *buf, int len)
 122 {
 123 #ifdef CONFIG_USER_ONLY
 124     int ret;
 125
 126     while (len > 0) {
 127         ret = send(s->fd, buf, len, 0);
 128         if (ret < 0) {
 129             if (errno != EINTR && errno != EAGAIN)
 130                 return;
 131         } else {
 132             buf += ret;
 133             len -= ret;
 134         }
 135     }
 136 #else
 137     qemu_chr_write(s->chr, buf, len);
 138 #endif
 139 }
 140
 141 static inline int fromhex(int v)
 142 {
 143     if (v >= '0' && v <= '9')
 144         return v - '0';
 145     else if (v >= 'A' && v <= 'F')
 146         return v - 'A' + 10;
 147     else if (v >= 'a' && v <= 'f')
 148         return v - 'a' + 10;
 149     else
 150         return 0;
 151 }
 152
 153 static inline int tohex(int v)
 154 {
 155     if (v < 10)
 156         return v + '0';
 157     else
 158         return v - 10 + 'a';
 159 }
 160
 161 static void memtohex(char *buf, const uint8_t *mem, int len)
 162 {
 163     int i, c;
 164     char *q;
 165     q = buf;
 166     for(i = 0; i < len; i++) {
 167         c = mem[i];
 168         *q++ = tohex(c >> 4);
 169         *q++ = tohex(c & 0xf);
 170     }
 171     *q = '\0';
 172 }
 173
 174 static void hextomem(uint8_t *mem, const char *buf, int len)
 175 {
 176     int i;
 177
 178     for(i = 0; i < len; i++) {
 179         mem[i] = (fromhex(buf[0]) << 4) | fromhex(buf[1]);
 180         buf += 2;
 181     }
 182 }
 183
 184 /* return -1 if error, 0 if OK */
 185 static int put_packet(GDBState *s, char *buf)
 186 {
 187     int len, csum, i;
 188     char *p;
 189
 190 #ifdef DEBUG_GDB
 191     printf("reply='%s'\n", buf);
 192 #endif
 193
 194     for(;;) {
 195         p = s->last_packet;
 196         *(p++) = '$';
 197         len = strlen(buf);
 198         memcpy(p, buf, len);
 199         p += len;
 200         csum = 0;
 201         for(i = 0; i < len; i++) {
 202             csum += buf[i];
 203         }
 204         *(p++) = '#';
 205         *(p++) = tohex((csum >> 4) & 0xf);
 206         *(p++) = tohex((csum) & 0xf);
 207
 208         s->last_packet_len = p - s->last_packet;
 209         put_buffer(s, s->last_packet, s->last_packet_len);
 210
 211 #ifdef CONFIG_USER_ONLY
 212         i = get_char(s);
 213         if (i < 0)
 214             return -1;
 215         if (i == '+')
 216             break;
 217 #else
 218         break;
 219 #endif
 220     }
 221     return 0;
 222 }
 223
 224 #if defined(TARGET_I386)
 225
 226 static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
 227 {
 228     uint32_t *registers = (uint32_t *)mem_buf;
 229     int i, fpus;
 230
 231     for(i = 0; i < 8; i++) {
 232         registers[i] = env->regs[i];
 233     }
 234     registers[8] = env->eip;
 235     registers[9] = env->eflags;
 236     registers[10] = env->segs[R_CS].selector;
 237     registers[11] = env->segs[R_SS].selector;
 238     registers[12] = env->segs[R_DS].selector;
 239     registers[13] = env->segs[R_ES].selector;
 240     registers[14] = env->segs[R_FS].selector;
 241     registers[15] = env->segs[R_GS].selector;
 242     /* XXX: convert floats */
 243     for(i = 0; i < 8; i++) {
 244         memcpy(mem_buf + 16 * 4 + i * 10, &env->fpregs[i], 10);
 245     }
 246     registers[36] = env->fpuc;
 247     fpus = (env->fpus & ~0x3800) | (env->fpstt & 0x7) << 11;
 248     registers[37] = fpus;
 249     registers[38] = 0; /* XXX: convert tags */
 250     registers[39] = 0; /* fiseg */
 251     registers[40] = 0; /* fioff */
 252     registers[41] = 0; /* foseg */
 253     registers[42] = 0; /* fooff */
 254     registers[43] = 0; /* fop */
 255
 256     for(i = 0; i < 16; i++)
 257         tswapls(&registers[i]);
 258     for(i = 36; i < 44; i++)
 259         tswapls(&registers[i]);
 260     return 44 * 4;
 261 }
 262
 263 static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
 264 {
 265     uint32_t *registers = (uint32_t *)mem_buf;
 266     int i;
 267
 268     for(i = 0; i < 8; i++) {
 269         env->regs[i] = tswapl(registers[i]);
 270     }
 271     env->eip = tswapl(registers[8]);
 272     env->eflags = tswapl(registers[9]);
 273 #if defined(CONFIG_USER_ONLY)
 274 #define LOAD_SEG(index, sreg)\
 275             if (tswapl(registers[index]) != env->segs[sreg].selector)\
 276                 cpu_x86_load_seg(env, sreg, tswapl(registers[index]));
 277             LOAD_SEG(10, R_CS);
 278             LOAD_SEG(11, R_SS);
 279             LOAD_SEG(12, R_DS);
 280             LOAD_SEG(13, R_ES);
 281             LOAD_SEG(14, R_FS);
 282             LOAD_SEG(15, R_GS);
 283 #endif
 284 }
 285
 286 #elif defined (TARGET_PPC)
 287 static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
 288 {
 289     uint32_t *registers = (uint32_t *)mem_buf, tmp;
 290     int i;
 291
 292     /* fill in gprs */
 293     for(i = 0; i < 32; i++) {
 294         registers[i] = tswapl(env->gpr[i]);
 295     }
 296     /* fill in fprs */
 297     for (i = 0; i < 32; i++) {
 298         registers[(i * 2) + 32] = tswapl(*((uint32_t *)&env->fpr[i]));
 299         registers[(i * 2) + 33] = tswapl(*((uint32_t *)&env->fpr[i] + 1));
 300     }
 301     /* nip, msr, ccr, lnk, ctr, xer, mq */
 302     registers[96] = tswapl(env->nip);
 303     registers[97] = tswapl(do_load_msr(env));
 304     tmp = 0;
 305     for (i = 0; i < 8; i++)
 306         tmp |= env->crf[i] << (32 - ((i + 1) * 4));
 307     registers[98] = tswapl(tmp);
 308     registers[99] = tswapl(env->lr);
 309     registers[100] = tswapl(env->ctr);
 310     registers[101] = tswapl(ppc_load_xer(env));
 311     registers[102] = 0;
 312
 313     return 103 * 4;
 314 }
 315
 316 static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
 317 {
 318     uint32_t *registers = (uint32_t *)mem_buf;
 319     int i;
 320
 321     /* fill in gprs */
 322     for (i = 0; i < 32; i++) {
 323         env->gpr[i] = tswapl(registers[i]);
 324     }
 325     /* fill in fprs */
 326     for (i = 0; i < 32; i++) {
 327         *((uint32_t *)&env->fpr[i]) = tswapl(registers[(i * 2) + 32]);
 328         *((uint32_t *)&env->fpr[i] + 1) = tswapl(registers[(i * 2) + 33]);
 329     }
 330     /* nip, msr, ccr, lnk, ctr, xer, mq */
 331     env->nip = tswapl(registers[96]);
 332     do_store_msr(env, tswapl(registers[97]));
 333     registers[98] = tswapl(registers[98]);
 334     for (i = 0; i < 8; i++)
 335         env->crf[i] = (registers[98] >> (32 - ((i + 1) * 4))) & 0xF;
 336     env->lr = tswapl(registers[99]);
 337     env->ctr = tswapl(registers[100]);
 338     ppc_store_xer(env, tswapl(registers[101]));
 339 }
 340 #elif defined (TARGET_SPARC)
 341 static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
 342 {
 343     target_ulong *registers = (target_ulong *)mem_buf;
 344     int i;
 345
 346     /* fill in g0..g7 */
 347     for(i = 0; i < 8; i++) {
 348         registers[i] = tswapl(env->gregs[i]);
 349     }
 350     /* fill in register window */
 351     for(i = 0; i < 24; i++) {
 352         registers[i + 8] = tswapl(env->regwptr[i]);
 353     }
 354 #ifndef TARGET_SPARC64
 355     /* fill in fprs */
 356     for (i = 0; i < 32; i++) {
 357         registers[i + 32] = tswapl(*((uint32_t *)&env->fpr[i]));
 358     }
 359     /* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */
 360     registers[64] = tswapl(env->y);
 361     {
 362         target_ulong tmp;
 363
 364         tmp = GET_PSR(env);
 365         registers[65] = tswapl(tmp);
 366     }
 367     registers[66] = tswapl(env->wim);
 368     registers[67] = tswapl(env->tbr);
 369     registers[68] = tswapl(env->pc);
 370     registers[69] = tswapl(env->npc);
 371     registers[70] = tswapl(env->fsr);
 372     registers[71] = 0; /* csr */
 373     registers[72] = 0;
 374     return 73 * sizeof(target_ulong);
 375 #else
 376     /* fill in fprs */
 377     for (i = 0; i < 64; i += 2) {
 378         uint64_t tmp;
 379
 380         tmp = (uint64_t)tswap32(*((uint32_t *)&env->fpr[i])) << 32;
 381         tmp |= tswap32(*((uint32_t *)&env->fpr[i + 1]));
 382         registers[i/2 + 32] = tmp;
 383     }
 384     registers[64] = tswapl(env->pc);
 385     registers[65] = tswapl(env->npc);
 386     registers[66] = tswapl(env->tstate[env->tl]);
 387     registers[67] = tswapl(env->fsr);
 388     registers[68] = tswapl(env->fprs);
 389     registers[69] = tswapl(env->y);
 390     return 70 * sizeof(target_ulong);
 391 #endif
 392 }
 393
 394 static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
 395 {
 396     target_ulong *registers = (target_ulong *)mem_buf;
 397     int i;
 398
 399     /* fill in g0..g7 */
 400     for(i = 0; i < 7; i++) {
 401         env->gregs[i] = tswapl(registers[i]);
 402     }
 403     /* fill in register window */
 404     for(i = 0; i < 24; i++) {
 405         env->regwptr[i] = tswapl(registers[i + 8]);
 406     }
 407 #ifndef TARGET_SPARC64
 408     /* fill in fprs */
 409     for (i = 0; i < 32; i++) {
 410         *((uint32_t *)&env->fpr[i]) = tswapl(registers[i + 32]);
 411     }
 412     /* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */
 413     env->y = tswapl(registers[64]);
 414     PUT_PSR(env, tswapl(registers[65]));
 415     env->wim = tswapl(registers[66]);
 416     env->tbr = tswapl(registers[67]);
 417     env->pc = tswapl(registers[68]);
 418     env->npc = tswapl(registers[69]);
 419     env->fsr = tswapl(registers[70]);
 420 #else
 421     for (i = 0; i < 64; i += 2) {
 422         *((uint32_t *)&env->fpr[i]) = tswap32(registers[i/2 + 32] >> 32);
 423         *((uint32_t *)&env->fpr[i + 1]) = tswap32(registers[i/2 + 32] & 0xffffffff);
 424     }
 425     env->pc = tswapl(registers[64]);
 426     env->npc = tswapl(registers[65]);
 427     env->tstate[env->tl] = tswapl(registers[66]);
 428     env->fsr = tswapl(registers[67]);
 429     env->fprs = tswapl(registers[68]);
 430     env->y = tswapl(registers[69]);
 431 #endif
 432 }
 433 #elif defined (TARGET_ARM)
 434 static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
 435 {
 436     int i;
 437     uint8_t *ptr;
 438
 439     ptr = mem_buf;
 440     /* 16 core integer registers (4 bytes each).  */
 441     for (i = 0; i < 16; i++)
 442       {
 443         *(uint32_t *)ptr = tswapl(env->regs[i]);
 444         ptr += 4;
 445       }
 446     /* 8 FPA registers (12 bytes each), FPS (4 bytes).
 447        Not yet implemented.  */
 448     memset (ptr, 0, 8 * 12 + 4);
 449     ptr += 8 * 12 + 4;
 450     /* CPSR (4 bytes).  */
 451     *(uint32_t *)ptr = tswapl (cpsr_read(env));
 452     ptr += 4;
 453
 454     return ptr - mem_buf;
 455 }
 456
 457 static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
 458 {
 459     int i;
 460     uint8_t *ptr;
 461
 462     ptr = mem_buf;
 463     /* Core integer registers.  */
 464     for (i = 0; i < 16; i++)
 465       {
 466         env->regs[i] = tswapl(*(uint32_t *)ptr);
 467         ptr += 4;
 468       }
 469     /* Ignore FPA regs and scr.  */
 470     ptr += 8 * 12 + 4;
 471     cpsr_write (env, tswapl(*(uint32_t *)ptr), 0xffffffff);
 472 }
 473 #elif defined (TARGET_M68K)
 474 static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
 475 {
 476     int i;
 477     uint8_t *ptr;
 478     CPU_DoubleU u;
 479
 480     ptr = mem_buf;
 481     /* D0-D7 */
 482     for (i = 0; i < 8; i++) {
 483         *(uint32_t *)ptr = tswapl(env->dregs[i]);
 484         ptr += 4;
 485     }
 486     /* A0-A7 */
 487     for (i = 0; i < 8; i++) {
 488         *(uint32_t *)ptr = tswapl(env->aregs[i]);
 489         ptr += 4;
 490     }
 491     *(uint32_t *)ptr = tswapl(env->sr);
 492     ptr += 4;
 493     *(uint32_t *)ptr = tswapl(env->pc);
 494     ptr += 4;
 495     /* F0-F7.  The 68881/68040 have 12-bit extended precision registers.
 496        ColdFire has 8-bit double precision registers.  */
 497     for (i = 0; i < 8; i++) {
 498         u.d = env->fregs[i];
 499         *(uint32_t *)ptr = tswap32(u.l.upper);
 500         *(uint32_t *)ptr = tswap32(u.l.lower);
 501     }
 502     /* FP control regs (not implemented).  */
 503     memset (ptr, 0, 3 * 4);
 504     ptr += 3 * 4;
 505
 506     return ptr - mem_buf;
 507 }
 508
 509 static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
 510 {
 511     int i;
 512     uint8_t *ptr;
 513     CPU_DoubleU u;
 514
 515     ptr = mem_buf;
 516     /* D0-D7 */
 517     for (i = 0; i < 8; i++) {
 518         env->dregs[i] = tswapl(*(uint32_t *)ptr);
 519         ptr += 4;
 520     }
 521     /* A0-A7 */
 522     for (i = 0; i < 8; i++) {
 523         env->aregs[i] = tswapl(*(uint32_t *)ptr);
 524         ptr += 4;
 525     }
 526     env->sr = tswapl(*(uint32_t *)ptr);
 527     ptr += 4;
 528     env->pc = tswapl(*(uint32_t *)ptr);
 529     ptr += 4;
 530     /* F0-F7.  The 68881/68040 have 12-bit extended precision registers.
 531        ColdFire has 8-bit double precision registers.  */
 532     for (i = 0; i < 8; i++) {
 533         u.l.upper = tswap32(*(uint32_t *)ptr);
 534         u.l.lower = tswap32(*(uint32_t *)ptr);
 535         env->fregs[i] = u.d;
 536     }
 537     /* FP control regs (not implemented).  */
 538     ptr += 3 * 4;
 539 }
 540 #elif defined (TARGET_MIPS)
 541 static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
 542 {
 543     int i;
 544     uint8_t *ptr;
 545
 546     ptr = mem_buf;
 547     for (i = 0; i < 32; i++)
 548       {
 549         *(uint32_t *)ptr = tswapl(env->gpr[i]);
 550         ptr += 4;
 551       }
 552
 553     *(uint32_t *)ptr = tswapl(env->CP0_Status);
 554     ptr += 4;
 555
 556     *(uint32_t *)ptr = tswapl(env->LO);
 557     ptr += 4;
 558
 559     *(uint32_t *)ptr = tswapl(env->HI);
 560     ptr += 4;
 561
 562     *(uint32_t *)ptr = tswapl(env->CP0_BadVAddr);
 563     ptr += 4;
 564
 565     *(uint32_t *)ptr = tswapl(env->CP0_Cause);
 566     ptr += 4;
 567
 568     *(uint32_t *)ptr = tswapl(env->PC);
 569     ptr += 4;
 570
 571     if (env->CP0_Config1 & (1 << CP0C1_FP))
 572       {
 573         for (i = 0; i < 32; i++)
 574           {
 575             *(uint32_t *)ptr = tswapl(FPR_W (env, i));
 576             ptr += 4;
 577           }
 578
 579         *(uint32_t *)ptr = tswapl(env->fcr31);
 580         ptr += 4;
 581
 582         *(uint32_t *)ptr = tswapl(env->fcr0);
 583         ptr += 4;
 584       }
 585
 586     /* 32 FP registers, fsr, fir, fp.  Not yet implemented.  */
 587     /* what's 'fp' mean here?  */
 588
 589     return ptr - mem_buf;
 590 }
 591
 592 /* convert MIPS rounding mode in FCR31 to IEEE library */
 593 static unsigned int ieee_rm[] =
 594   {
 595     float_round_nearest_even,
 596     float_round_to_zero,
 597     float_round_up,
 598     float_round_down
 599   };
 600 #define RESTORE_ROUNDING_MODE \
 601     set_float_rounding_mode(ieee_rm[env->fcr31 & 3], &env->fp_status)
 602
 603 static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
 604 {
 605     int i;
 606     uint8_t *ptr;
 607
 608     ptr = mem_buf;
 609     for (i = 0; i < 32; i++)
 610       {
 611         env->gpr[i] = tswapl(*(uint32_t *)ptr);
 612         ptr += 4;
 613       }
 614
 615     env->CP0_Status = tswapl(*(uint32_t *)ptr);
 616     ptr += 4;
 617
 618     env->LO = tswapl(*(uint32_t *)ptr);
 619     ptr += 4;
 620
 621     env->HI = tswapl(*(uint32_t *)ptr);
 622     ptr += 4;
 623
 624     env->CP0_BadVAddr = tswapl(*(uint32_t *)ptr);
 625     ptr += 4;
 626
 627     env->CP0_Cause = tswapl(*(uint32_t *)ptr);
 628     ptr += 4;
 629
 630     env->PC = tswapl(*(uint32_t *)ptr);
 631     ptr += 4;
 632
 633     if (env->CP0_Config1 & (1 << CP0C1_FP))
 634       {
 635         for (i = 0; i < 32; i++)
 636           {
 637             FPR_W (env, i) = tswapl(*(uint32_t *)ptr);
 638             ptr += 4;
 639           }
 640
 641         env->fcr31 = tswapl(*(uint32_t *)ptr) & 0x0183FFFF;
 642         ptr += 4;
 643
 644         env->fcr0 = tswapl(*(uint32_t *)ptr);
 645         ptr += 4;
 646
 647         /* set rounding mode */
 648         RESTORE_ROUNDING_MODE;
 649
 650 #ifndef CONFIG_SOFTFLOAT
 651         /* no floating point exception for native float */
 652         SET_FP_ENABLE(env->fcr31, 0);
 653 #endif
 654       }
 655 }
 656 #elif defined (TARGET_SH4)
 657 static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
 658 {
 659   uint32_t *ptr = (uint32_t *)mem_buf;
 660   int i;
 661
 662 #define SAVE(x) *ptr++=tswapl(x)
 663   if ((env->sr & (SR_MD | SR_RB)) == (SR_MD | SR_RB)) {
 664       for (i = 0; i < 8; i++) SAVE(env->gregs[i + 16]);
 665   } else {
 666       for (i = 0; i < 8; i++) SAVE(env->gregs[i]);
 667   }
 668   for (i = 8; i < 16; i++) SAVE(env->gregs[i]);
 669   SAVE (env->pc);
 670   SAVE (env->pr);
 671   SAVE (env->gbr);
 672   SAVE (env->vbr);
 673   SAVE (env->mach);
 674   SAVE (env->macl);
 675   SAVE (env->sr);
 676   SAVE (0); /* TICKS */
 677   SAVE (0); /* STALLS */
 678   SAVE (0); /* CYCLES */
 679   SAVE (0); /* INSTS */
 680   SAVE (0); /* PLR */
 681
 682   return ((uint8_t *)ptr - mem_buf);
 683 }
 684
 685 static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
 686 {
 687   uint32_t *ptr = (uint32_t *)mem_buf;
 688   int i;
 689
 690 #define LOAD(x) (x)=*ptr++;
 691   if ((env->sr & (SR_MD | SR_RB)) == (SR_MD | SR_RB)) {
 692       for (i = 0; i < 8; i++) LOAD(env->gregs[i + 16]);
 693   } else {
 694       for (i = 0; i < 8; i++) LOAD(env->gregs[i]);
 695   }
 696   for (i = 8; i < 16; i++) LOAD(env->gregs[i]);
 697   LOAD (env->pc);
 698   LOAD (env->pr);
 699   LOAD (env->gbr);
 700   LOAD (env->vbr);
 701   LOAD (env->mach);
 702   LOAD (env->macl);
 703   LOAD (env->sr);
 704 }
 705 #else
 706 static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
 707 {
 708     return 0;
 709 }
 710
 711 static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
 712 {
 713 }
 714
 715 #endif
 716
 717 static int gdb_handle_packet(GDBState *s, CPUState *env, const char *line_buf)
 718 {
 719     const char *p;
 720     int ch, reg_size, type;
 721     char buf[4096];
 722     uint8_t mem_buf[2000];
 723     uint32_t *registers;
 724     target_ulong addr, len;
 725
 726 #ifdef DEBUG_GDB
 727     printf("command='%s'\n", line_buf);
 728 #endif
 729     p = line_buf;
 730     ch = *p++;
 731     switch(ch) {
 732     case '?':
 733         /* TODO: Make this return the correct value for user-mode.  */
 734         snprintf(buf, sizeof(buf), "S%02x", SIGTRAP);
 735         put_packet(s, buf);
 736         break;
 737     case 'c':
 738         if (*p != '\0') {
 739             addr = strtoull(p, (char **)&p, 16);
 740 #if defined(TARGET_I386)
 741             env->eip = addr;
 742 #elif defined (TARGET_PPC)
 743             env->nip = addr;
 744 #elif defined (TARGET_SPARC)
 745             env->pc = addr;
 746             env->npc = addr + 4;
 747 #elif defined (TARGET_ARM)
 748             env->regs[15] = addr;
 749 #elif defined (TARGET_SH4)
 750             env->pc = addr;
 751 #endif
 752         }
 753 #ifdef CONFIG_USER_ONLY
 754         s->running_state = 1;
 755 #else
 756         vm_start();
 757 #endif
 758         return RS_IDLE;
 759     case 's':
 760         if (*p != '\0') {
 761             addr = strtoul(p, (char **)&p, 16);
 762 #if defined(TARGET_I386)
 763             env->eip = addr;
 764 #elif defined (TARGET_PPC)
 765             env->nip = addr;
 766 #elif defined (TARGET_SPARC)
 767             env->pc = addr;
 768             env->npc = addr + 4;
 769 #elif defined (TARGET_ARM)
 770             env->regs[15] = addr;
 771 #elif defined (TARGET_SH4)
 772             env->pc = addr;
 773 #endif
 774         }
 775         cpu_single_step(env, 1);
 776 #ifdef CONFIG_USER_ONLY
 777         s->running_state = 1;
 778 #else
 779         vm_start();
 780 #endif
 781         return RS_IDLE;
 782     case 'F':
 783         {
 784             target_ulong ret;
 785             target_ulong err;
 786
 787             ret = strtoull(p, (char **)&p, 16);
 788             if (*p == ',') {
 789                 p++;
 790                 err = strtoull(p, (char **)&p, 16);
 791             } else {
 792                 err = 0;
 793             }
 794             if (*p == ',')
 795                 p++;
 796             type = *p;
 797             if (gdb_current_syscall_cb)
 798                 gdb_current_syscall_cb(s->env, ret, err);
 799             if (type == 'C') {
 800                 put_packet(s, "T02");
 801             } else {
 802 #ifdef CONFIG_USER_ONLY
 803                 s->running_state = 1;
 804 #else
 805                 vm_start();
 806 #endif
 807             }
 808         }
 809         break;
 810     case 'g':
 811         reg_size = cpu_gdb_read_registers(env, mem_buf);
 812         memtohex(buf, mem_buf, reg_size);
 813         put_packet(s, buf);
 814         break;
 815     case 'G':
 816         registers = (void *)mem_buf;
 817         len = strlen(p) / 2;
 818         hextomem((uint8_t *)registers, p, len);
 819         cpu_gdb_write_registers(env, mem_buf, len);
 820         put_packet(s, "OK");
 821         break;
 822     case 'm':
 823         addr = strtoull(p, (char **)&p, 16);
 824         if (*p == ',')
 825             p++;
 826         len = strtoull(p, NULL, 16);
 827         if (cpu_memory_rw_debug(env, addr, mem_buf, len, 0) != 0) {
 828             put_packet (s, "E14");
 829         } else {
 830             memtohex(buf, mem_buf, len);
 831             put_packet(s, buf);
 832         }
 833         break;
 834     case 'M':
 835         addr = strtoull(p, (char **)&p, 16);
 836         if (*p == ',')
 837             p++;
 838         len = strtoull(p, (char **)&p, 16);
 839         if (*p == ':')
 840             p++;
 841         hextomem(mem_buf, p, len);
 842         if (cpu_memory_rw_debug(env, addr, mem_buf, len, 1) != 0)
 843             put_packet(s, "E14");
 844         else
 845             put_packet(s, "OK");
 846         break;
 847     case 'Z':
 848         type = strtoul(p, (char **)&p, 16);
 849         if (*p == ',')
 850             p++;
 851         addr = strtoull(p, (char **)&p, 16);
 852         if (*p == ',')
 853             p++;
 854         len = strtoull(p, (char **)&p, 16);
 855         if (type == 0 || type == 1) {
 856             if (cpu_breakpoint_insert(env, addr) < 0)
 857                 goto breakpoint_error;
 858             put_packet(s, "OK");
 859         } else {
 860         breakpoint_error:
 861             put_packet(s, "E22");
 862         }
 863         break;
 864     case 'z':
 865         type = strtoul(p, (char **)&p, 16);
 866         if (*p == ',')
 867             p++;
 868         addr = strtoull(p, (char **)&p, 16);
 869         if (*p == ',')
 870             p++;
 871         len = strtoull(p, (char **)&p, 16);
 872         if (type == 0 || type == 1) {
 873             cpu_breakpoint_remove(env, addr);
 874             put_packet(s, "OK");
 875         } else {
 876             goto breakpoint_error;
 877         }
 878         break;
 879 #ifdef CONFIG_LINUX_USER
 880     case 'q':
 881         if (strncmp(p, "Offsets", 7) == 0) {
 882             TaskState *ts = env->opaque;
 883
 884             sprintf(buf, "Text=%x;Data=%x;Bss=%x", ts->info->code_offset,
 885                 ts->info->data_offset, ts->info->data_offset);
 886             put_packet(s, buf);
 887             break;
 888         }
 889         /* Fall through.  */
 890 #endif
 891     default:
 892         //        unknown_command:
 893         /* put empty packet */
 894         buf[0] = '\0';
 895         put_packet(s, buf);
 896         break;
 897     }
 898     return RS_IDLE;
 899 }
 900
 901 extern void tb_flush(CPUState *env);
 902
 903 #ifndef CONFIG_USER_ONLY
 904 static void gdb_vm_stopped(void *opaque, int reason)
 905 {
 906     GDBState *s = opaque;
 907     char buf[256];
 908     int ret;
 909
 910     if (s->state == RS_SYSCALL)
 911         return;
 912
 913     /* disable single step if it was enable */
 914     cpu_single_step(s->env, 0);
 915
 916     if (reason == EXCP_DEBUG) {
 917         tb_flush(s->env);
 918         ret = SIGTRAP;
 919     } else if (reason == EXCP_INTERRUPT) {
 920         ret = SIGINT;
 921     } else {
 922         ret = 0;
 923     }
 924     snprintf(buf, sizeof(buf), "S%02x", ret);
 925     put_packet(s, buf);
 926 }
 927 #endif
 928
 929 /* Send a gdb syscall request.
 930    This accepts limited printf-style format specifiers, specifically:
 931     %x - target_ulong argument printed in hex.
 932     %s - string pointer (target_ulong) and length (int) pair.  */
 933 void gdb_do_syscall(gdb_syscall_complete_cb cb, char *fmt, ...)
 934 {
 935     va_list va;
 936     char buf[256];
 937     char *p;
 938     target_ulong addr;
 939     GDBState *s;
 940
 941     s = gdb_syscall_state;
 942     if (!s)
 943         return;
 944     gdb_current_syscall_cb = cb;
 945     s->state = RS_SYSCALL;
 946 #ifndef CONFIG_USER_ONLY
 947     vm_stop(EXCP_DEBUG);
 948 #endif
 949     s->state = RS_IDLE;
 950     va_start(va, fmt);
 951     p = buf;
 952     *(p++) = 'F';
 953     while (*fmt) {
 954         if (*fmt == '%') {
 955             fmt++;
 956             switch (*fmt++) {
 957             case 'x':
 958                 addr = va_arg(va, target_ulong);
 959                 p += sprintf(p, TARGET_FMT_lx, addr);
 960                 break;
 961             case 's':
 962                 addr = va_arg(va, target_ulong);
 963                 p += sprintf(p, TARGET_FMT_lx "/%x", addr, va_arg(va, int));
 964                 break;
 965             default:
 966                 fprintf(stderr, "gdbstub: Bad syscall format string '%s'\n",
 967                         fmt - 1);
 968                 break;
 969             }
 970         } else {
 971             *(p++) = *(fmt++);
 972         }
 973     }
 974     va_end(va);
 975     put_packet(s, buf);
 976 #ifdef CONFIG_USER_ONLY
 977     gdb_handlesig(s->env, 0);
 978 #else
 979     cpu_interrupt(s->env, CPU_INTERRUPT_EXIT);
 980 #endif
 981 }
 982
 983 static void gdb_read_byte(GDBState *s, int ch)
 984 {
 985     CPUState *env = s->env;
 986     int i, csum;
 987     char reply[1];
 988
 989 #ifndef CONFIG_USER_ONLY
 990     if (s->last_packet_len) {
 991         /* Waiting for a response to the last packet.  If we see the start
 992            of a new command then abandon the previous response.  */
 993         if (ch == '-') {
 994 #ifdef DEBUG_GDB
 995             printf("Got NACK, retransmitting\n");
 996 #endif
 997             put_buffer(s, s->last_packet, s->last_packet_len);
 998         }
 999 #ifdef DEBUG_GDB
1000         else if (ch == '+')
1001             printf("Got ACK\n");
1002         else
1003             printf("Got '%c' when expecting ACK/NACK\n", ch);
1004 #endif
1005         if (ch == '+' || ch == '$')
1006             s->last_packet_len = 0;
1007         if (ch != '$')
1008             return;
1009     }
1010     if (vm_running) {
1011         /* when the CPU is running, we cannot do anything except stop
1012            it when receiving a char */
1013         vm_stop(EXCP_INTERRUPT);
1014     } else
1015 #endif
1016     {
1017         switch(s->state) {
1018         case RS_IDLE:
1019             if (ch == '$') {
1020                 s->line_buf_index = 0;
1021                 s->state = RS_GETLINE;
1022             }
1023             break;
1024         case RS_GETLINE:
1025             if (ch == '#') {
1026             s->state = RS_CHKSUM1;
1027             } else if (s->line_buf_index >= sizeof(s->line_buf) - 1) {
1028                 s->state = RS_IDLE;
1029             } else {
1030             s->line_buf[s->line_buf_index++] = ch;
1031             }
1032             break;
1033         case RS_CHKSUM1:
1034             s->line_buf[s->line_buf_index] = '\0';
1035             s->line_csum = fromhex(ch) << 4;
1036             s->state = RS_CHKSUM2;
1037             break;
1038         case RS_CHKSUM2:
1039             s->line_csum |= fromhex(ch);
1040             csum = 0;
1041             for(i = 0; i < s->line_buf_index; i++) {
1042                 csum += s->line_buf[i];
1043             }
1044             if (s->line_csum != (csum & 0xff)) {
1045                 reply[0] = '-';
1046                 put_buffer(s, reply, 1);
1047                 s->state = RS_IDLE;
1048             } else {
1049                 reply[0] = '+';
1050                 put_buffer(s, reply, 1);
1051                 s->state = gdb_handle_packet(s, env, s->line_buf);
1052             }
1053             break;
1054         default:
1055             abort();
1056         }
1057     }
1058 }
1059
1060 #ifdef CONFIG_USER_ONLY
1061 int
1062 gdb_handlesig (CPUState *env, int sig)
1063 {
1064   GDBState *s;
1065   char buf[256];
1066   int n;
1067
1068   if (gdbserver_fd < 0)
1069     return sig;
1070
1071   s = &gdbserver_state;
1072
1073   /* disable single step if it was enabled */
1074   cpu_single_step(env, 0);
1075   tb_flush(env);
1076
1077   if (sig != 0)
1078     {
1079       snprintf(buf, sizeof(buf), "S%02x", sig);
1080       put_packet(s, buf);
1081     }
1082
1083   sig = 0;
1084   s->state = RS_IDLE;
1085   s->running_state = 0;
1086   while (s->running_state == 0) {
1087       n = read (s->fd, buf, 256);
1088       if (n > 0)
1089         {
1090           int i;
1091
1092           for (i = 0; i < n; i++)
1093             gdb_read_byte (s, buf[i]);
1094         }
1095       else if (n == 0 || errno != EAGAIN)
1096         {
1097           /* XXX: Connection closed.  Should probably wait for annother
1098              connection before continuing.  */
1099           return sig;
1100         }
1101   }
1102   return sig;
1103 }
1104
1105 /* Tell the remote gdb that the process has exited.  */
1106 void gdb_exit(CPUState *env, int code)
1107 {
1108   GDBState *s;
1109   char buf[4];
1110
1111   if (gdbserver_fd < 0)
1112     return;
1113
1114   s = &gdbserver_state;
1115
1116   snprintf(buf, sizeof(buf), "W%02x", code);
1117   put_packet(s, buf);
1118 }
1119
1120
1121 static void gdb_accept(void *opaque)
1122 {
1123     GDBState *s;
1124     struct sockaddr_in sockaddr;
1125     socklen_t len;
1126     int val, fd;
1127
1128     for(;;) {
1129         len = sizeof(sockaddr);
1130         fd = accept(gdbserver_fd, (struct sockaddr *)&sockaddr, &len);
1131         if (fd < 0 && errno != EINTR) {
1132             perror("accept");
1133             return;
1134         } else if (fd >= 0) {
1135             break;
1136         }
1137     }
1138
1139     /* set short latency */
1140     val = 1;
1141     setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *)&val, sizeof(val));
1142
1143     s = &gdbserver_state;
1144     memset (s, 0, sizeof (GDBState));
1145     s->env = first_cpu; /* XXX: allow to change CPU */
1146     s->fd = fd;
1147
1148     gdb_syscall_state = s;
1149
1150     fcntl(fd, F_SETFL, O_NONBLOCK);
1151 }
1152
1153 static int gdbserver_open(int port)
1154 {
1155     struct sockaddr_in sockaddr;
1156     int fd, val, ret;
1157
1158     fd = socket(PF_INET, SOCK_STREAM, 0);
1159     if (fd < 0) {
1160         perror("socket");
1161         return -1;
1162     }
1163
1164     /* allow fast reuse */
1165     val = 1;
1166     setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&val, sizeof(val));
1167
1168     sockaddr.sin_family = AF_INET;
1169     sockaddr.sin_port = htons(port);
1170     sockaddr.sin_addr.s_addr = 0;
1171     ret = bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr));
1172     if (ret < 0) {
1173         perror("bind");
1174         return -1;
1175     }
1176     ret = listen(fd, 0);
1177     if (ret < 0) {
1178         perror("listen");
1179         return -1;
1180     }
1181     return fd;
1182 }
1183
1184 int gdbserver_start(int port)
1185 {
1186     gdbserver_fd = gdbserver_open(port);
1187     if (gdbserver_fd < 0)
1188         return -1;
1189     /* accept connections */
1190     gdb_accept (NULL);
1191     return 0;
1192 }
1193 #else
1194 static int gdb_chr_can_recieve(void *opaque)
1195 {
1196   return 1;
1197 }
1198
1199 static void gdb_chr_recieve(void *opaque, const uint8_t *buf, int size)
1200 {
1201     GDBState *s = opaque;
1202     int i;
1203
1204     for (i = 0; i < size; i++) {
1205         gdb_read_byte(s, buf[i]);
1206     }
1207 }
1208
1209 static void gdb_chr_event(void *opaque, int event)
1210 {
1211     switch (event) {
1212     case CHR_EVENT_RESET:
1213         vm_stop(EXCP_INTERRUPT);
1214         gdb_syscall_state = opaque;
1215         break;
1216     default:
1217         break;
1218     }
1219 }
1220
1221 int gdbserver_start(const char *port)
1222 {
1223     GDBState *s;
1224     char gdbstub_port_name[128];
1225     int port_num;
1226     char *p;
1227     CharDriverState *chr;
1228
1229     if (!port || !*port)
1230       return -1;
1231
1232     port_num = strtol(port, &p, 10);
1233     if (*p == 0) {
1234         /* A numeric value is interpreted as a port number.  */
1235         snprintf(gdbstub_port_name, sizeof(gdbstub_port_name),
1236                  "tcp::%d,nowait,nodelay,server", port_num);
1237         port = gdbstub_port_name;
1238     }
1239
1240     chr = qemu_chr_open(port);
1241     if (!chr)
1242         return -1;
1243
1244     s = qemu_mallocz(sizeof(GDBState));
1245     if (!s) {
1246         return -1;
1247     }
1248     s->env = first_cpu; /* XXX: allow to change CPU */
1249     s->chr = chr;
1250     qemu_chr_add_handlers(chr, gdb_chr_can_recieve, gdb_chr_recieve,
1251                           gdb_chr_event, s);
1252     qemu_add_vm_stop_handler(gdb_vm_stopped, s);
1253     return 0;
1254 }
1255 #endif