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)*(uint32_t *)&env->fpr[i]) << 32;
 381         tmp |= *(uint32_t *)&env->fpr[i + 1];
 382         registers[i / 2 + 32] = tswap64(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         uint64_t tmp;
 423
 424         tmp = tswap64(registers[i / 2 + 32]);
 425         *((uint32_t *)&env->fpr[i]) = tmp >> 32;
 426         *((uint32_t *)&env->fpr[i + 1]) = tmp & 0xffffffff;
 427     }
 428     env->pc = tswapl(registers[64]);
 429     env->npc = tswapl(registers[65]);
 430     env->tstate[env->tl] = tswapl(registers[66]);
 431     env->fsr = tswapl(registers[67]);
 432     env->fprs = tswapl(registers[68]);
 433     env->y = tswapl(registers[69]);
 434 #endif
 435 }
 436 #elif defined (TARGET_ARM)
 437 static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
 438 {
 439     int i;
 440     uint8_t *ptr;
 441
 442     ptr = mem_buf;
 443     /* 16 core integer registers (4 bytes each).  */
 444     for (i = 0; i < 16; i++)
 445       {
 446         *(uint32_t *)ptr = tswapl(env->regs[i]);
 447         ptr += 4;
 448       }
 449     /* 8 FPA registers (12 bytes each), FPS (4 bytes).
 450        Not yet implemented.  */
 451     memset (ptr, 0, 8 * 12 + 4);
 452     ptr += 8 * 12 + 4;
 453     /* CPSR (4 bytes).  */
 454     *(uint32_t *)ptr = tswapl (cpsr_read(env));
 455     ptr += 4;
 456
 457     return ptr - mem_buf;
 458 }
 459
 460 static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
 461 {
 462     int i;
 463     uint8_t *ptr;
 464
 465     ptr = mem_buf;
 466     /* Core integer registers.  */
 467     for (i = 0; i < 16; i++)
 468       {
 469         env->regs[i] = tswapl(*(uint32_t *)ptr);
 470         ptr += 4;
 471       }
 472     /* Ignore FPA regs and scr.  */
 473     ptr += 8 * 12 + 4;
 474     cpsr_write (env, tswapl(*(uint32_t *)ptr), 0xffffffff);
 475 }
 476 #elif defined (TARGET_M68K)
 477 static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
 478 {
 479     int i;
 480     uint8_t *ptr;
 481     CPU_DoubleU u;
 482
 483     ptr = mem_buf;
 484     /* D0-D7 */
 485     for (i = 0; i < 8; i++) {
 486         *(uint32_t *)ptr = tswapl(env->dregs[i]);
 487         ptr += 4;
 488     }
 489     /* A0-A7 */
 490     for (i = 0; i < 8; i++) {
 491         *(uint32_t *)ptr = tswapl(env->aregs[i]);
 492         ptr += 4;
 493     }
 494     *(uint32_t *)ptr = tswapl(env->sr);
 495     ptr += 4;
 496     *(uint32_t *)ptr = tswapl(env->pc);
 497     ptr += 4;
 498     /* F0-F7.  The 68881/68040 have 12-bit extended precision registers.
 499        ColdFire has 8-bit double precision registers.  */
 500     for (i = 0; i < 8; i++) {
 501         u.d = env->fregs[i];
 502         *(uint32_t *)ptr = tswap32(u.l.upper);
 503         *(uint32_t *)ptr = tswap32(u.l.lower);
 504     }
 505     /* FP control regs (not implemented).  */
 506     memset (ptr, 0, 3 * 4);
 507     ptr += 3 * 4;
 508
 509     return ptr - mem_buf;
 510 }
 511
 512 static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
 513 {
 514     int i;
 515     uint8_t *ptr;
 516     CPU_DoubleU u;
 517
 518     ptr = mem_buf;
 519     /* D0-D7 */
 520     for (i = 0; i < 8; i++) {
 521         env->dregs[i] = tswapl(*(uint32_t *)ptr);
 522         ptr += 4;
 523     }
 524     /* A0-A7 */
 525     for (i = 0; i < 8; i++) {
 526         env->aregs[i] = tswapl(*(uint32_t *)ptr);
 527         ptr += 4;
 528     }
 529     env->sr = tswapl(*(uint32_t *)ptr);
 530     ptr += 4;
 531     env->pc = tswapl(*(uint32_t *)ptr);
 532     ptr += 4;
 533     /* F0-F7.  The 68881/68040 have 12-bit extended precision registers.
 534        ColdFire has 8-bit double precision registers.  */
 535     for (i = 0; i < 8; i++) {
 536         u.l.upper = tswap32(*(uint32_t *)ptr);
 537         u.l.lower = tswap32(*(uint32_t *)ptr);
 538         env->fregs[i] = u.d;
 539     }
 540     /* FP control regs (not implemented).  */
 541     ptr += 3 * 4;
 542 }
 543 #elif defined (TARGET_MIPS)
 544 static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
 545 {
 546     int i;
 547     uint8_t *ptr;
 548
 549     ptr = mem_buf;
 550     for (i = 0; i < 32; i++)
 551       {
 552         *(uint32_t *)ptr = tswapl(env->gpr[i]);
 553         ptr += 4;
 554       }
 555
 556     *(uint32_t *)ptr = tswapl(env->CP0_Status);
 557     ptr += 4;
 558
 559     *(uint32_t *)ptr = tswapl(env->LO);
 560     ptr += 4;
 561
 562     *(uint32_t *)ptr = tswapl(env->HI);
 563     ptr += 4;
 564
 565     *(uint32_t *)ptr = tswapl(env->CP0_BadVAddr);
 566     ptr += 4;
 567
 568     *(uint32_t *)ptr = tswapl(env->CP0_Cause);
 569     ptr += 4;
 570
 571     *(uint32_t *)ptr = tswapl(env->PC);
 572     ptr += 4;
 573
 574     if (env->CP0_Config1 & (1 << CP0C1_FP))
 575       {
 576         for (i = 0; i < 32; i++)
 577           {
 578             *(uint32_t *)ptr = tswapl(FPR_W (env, i));
 579             ptr += 4;
 580           }
 581
 582         *(uint32_t *)ptr = tswapl(env->fcr31);
 583         ptr += 4;
 584
 585         *(uint32_t *)ptr = tswapl(env->fcr0);
 586         ptr += 4;
 587       }
 588
 589     /* 32 FP registers, fsr, fir, fp.  Not yet implemented.  */
 590     /* what's 'fp' mean here?  */
 591
 592     return ptr - mem_buf;
 593 }
 594
 595 /* convert MIPS rounding mode in FCR31 to IEEE library */
 596 static unsigned int ieee_rm[] =
 597   {
 598     float_round_nearest_even,
 599     float_round_to_zero,
 600     float_round_up,
 601     float_round_down
 602   };
 603 #define RESTORE_ROUNDING_MODE \
 604     set_float_rounding_mode(ieee_rm[env->fcr31 & 3], &env->fp_status)
 605
 606 static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
 607 {
 608     int i;
 609     uint8_t *ptr;
 610
 611     ptr = mem_buf;
 612     for (i = 0; i < 32; i++)
 613       {
 614         env->gpr[i] = tswapl(*(uint32_t *)ptr);
 615         ptr += 4;
 616       }
 617
 618     env->CP0_Status = tswapl(*(uint32_t *)ptr);
 619     ptr += 4;
 620
 621     env->LO = tswapl(*(uint32_t *)ptr);
 622     ptr += 4;
 623
 624     env->HI = tswapl(*(uint32_t *)ptr);
 625     ptr += 4;
 626
 627     env->CP0_BadVAddr = tswapl(*(uint32_t *)ptr);
 628     ptr += 4;
 629
 630     env->CP0_Cause = tswapl(*(uint32_t *)ptr);
 631     ptr += 4;
 632
 633     env->PC = tswapl(*(uint32_t *)ptr);
 634     ptr += 4;
 635
 636     if (env->CP0_Config1 & (1 << CP0C1_FP))
 637       {
 638         for (i = 0; i < 32; i++)
 639           {
 640             FPR_W (env, i) = tswapl(*(uint32_t *)ptr);
 641             ptr += 4;
 642           }
 643
 644         env->fcr31 = tswapl(*(uint32_t *)ptr) & 0x0183FFFF;
 645         ptr += 4;
 646
 647         env->fcr0 = tswapl(*(uint32_t *)ptr);
 648         ptr += 4;
 649
 650         /* set rounding mode */
 651         RESTORE_ROUNDING_MODE;
 652
 653 #ifndef CONFIG_SOFTFLOAT
 654         /* no floating point exception for native float */
 655         SET_FP_ENABLE(env->fcr31, 0);
 656 #endif
 657       }
 658 }
 659 #elif defined (TARGET_SH4)
 660 static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
 661 {
 662   uint32_t *ptr = (uint32_t *)mem_buf;
 663   int i;
 664
 665 #define SAVE(x) *ptr++=tswapl(x)
 666   if ((env->sr & (SR_MD | SR_RB)) == (SR_MD | SR_RB)) {
 667       for (i = 0; i < 8; i++) SAVE(env->gregs[i + 16]);
 668   } else {
 669       for (i = 0; i < 8; i++) SAVE(env->gregs[i]);
 670   }
 671   for (i = 8; i < 16; i++) SAVE(env->gregs[i]);
 672   SAVE (env->pc);
 673   SAVE (env->pr);
 674   SAVE (env->gbr);
 675   SAVE (env->vbr);
 676   SAVE (env->mach);
 677   SAVE (env->macl);
 678   SAVE (env->sr);
 679   SAVE (0); /* TICKS */
 680   SAVE (0); /* STALLS */
 681   SAVE (0); /* CYCLES */
 682   SAVE (0); /* INSTS */
 683   SAVE (0); /* PLR */
 684
 685   return ((uint8_t *)ptr - mem_buf);
 686 }
 687
 688 static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
 689 {
 690   uint32_t *ptr = (uint32_t *)mem_buf;
 691   int i;
 692
 693 #define LOAD(x) (x)=*ptr++;
 694   if ((env->sr & (SR_MD | SR_RB)) == (SR_MD | SR_RB)) {
 695       for (i = 0; i < 8; i++) LOAD(env->gregs[i + 16]);
 696   } else {
 697       for (i = 0; i < 8; i++) LOAD(env->gregs[i]);
 698   }
 699   for (i = 8; i < 16; i++) LOAD(env->gregs[i]);
 700   LOAD (env->pc);
 701   LOAD (env->pr);
 702   LOAD (env->gbr);
 703   LOAD (env->vbr);
 704   LOAD (env->mach);
 705   LOAD (env->macl);
 706   LOAD (env->sr);
 707 }
 708 #else
 709 static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
 710 {
 711     return 0;
 712 }
 713
 714 static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
 715 {
 716 }
 717
 718 #endif
 719
 720 static int gdb_handle_packet(GDBState *s, CPUState *env, const char *line_buf)
 721 {
 722     const char *p;
 723     int ch, reg_size, type;
 724     char buf[4096];
 725     uint8_t mem_buf[2000];
 726     uint32_t *registers;
 727     target_ulong addr, len;
 728
 729 #ifdef DEBUG_GDB
 730     printf("command='%s'\n", line_buf);
 731 #endif
 732     p = line_buf;
 733     ch = *p++;
 734     switch(ch) {
 735     case '?':
 736         /* TODO: Make this return the correct value for user-mode.  */
 737         snprintf(buf, sizeof(buf), "S%02x", SIGTRAP);
 738         put_packet(s, buf);
 739         break;
 740     case 'c':
 741         if (*p != '\0') {
 742             addr = strtoull(p, (char **)&p, 16);
 743 #if defined(TARGET_I386)
 744             env->eip = addr;
 745 #elif defined (TARGET_PPC)
 746             env->nip = addr;
 747 #elif defined (TARGET_SPARC)
 748             env->pc = addr;
 749             env->npc = addr + 4;
 750 #elif defined (TARGET_ARM)
 751             env->regs[15] = addr;
 752 #elif defined (TARGET_SH4)
 753             env->pc = addr;
 754 #endif
 755         }
 756 #ifdef CONFIG_USER_ONLY
 757         s->running_state = 1;
 758 #else
 759         vm_start();
 760 #endif
 761         return RS_IDLE;
 762     case 's':
 763         if (*p != '\0') {
 764             addr = strtoul(p, (char **)&p, 16);
 765 #if defined(TARGET_I386)
 766             env->eip = addr;
 767 #elif defined (TARGET_PPC)
 768             env->nip = addr;
 769 #elif defined (TARGET_SPARC)
 770             env->pc = addr;
 771             env->npc = addr + 4;
 772 #elif defined (TARGET_ARM)
 773             env->regs[15] = addr;
 774 #elif defined (TARGET_SH4)
 775             env->pc = addr;
 776 #endif
 777         }
 778         cpu_single_step(env, 1);
 779 #ifdef CONFIG_USER_ONLY
 780         s->running_state = 1;
 781 #else
 782         vm_start();
 783 #endif
 784         return RS_IDLE;
 785     case 'F':
 786         {
 787             target_ulong ret;
 788             target_ulong err;
 789
 790             ret = strtoull(p, (char **)&p, 16);
 791             if (*p == ',') {
 792                 p++;
 793                 err = strtoull(p, (char **)&p, 16);
 794             } else {
 795                 err = 0;
 796             }
 797             if (*p == ',')
 798                 p++;
 799             type = *p;
 800             if (gdb_current_syscall_cb)
 801                 gdb_current_syscall_cb(s->env, ret, err);
 802             if (type == 'C') {
 803                 put_packet(s, "T02");
 804             } else {
 805 #ifdef CONFIG_USER_ONLY
 806                 s->running_state = 1;
 807 #else
 808                 vm_start();
 809 #endif
 810             }
 811         }
 812         break;
 813     case 'g':
 814         reg_size = cpu_gdb_read_registers(env, mem_buf);
 815         memtohex(buf, mem_buf, reg_size);
 816         put_packet(s, buf);
 817         break;
 818     case 'G':
 819         registers = (void *)mem_buf;
 820         len = strlen(p) / 2;
 821         hextomem((uint8_t *)registers, p, len);
 822         cpu_gdb_write_registers(env, mem_buf, len);
 823         put_packet(s, "OK");
 824         break;
 825     case 'm':
 826         addr = strtoull(p, (char **)&p, 16);
 827         if (*p == ',')
 828             p++;
 829         len = strtoull(p, NULL, 16);
 830         if (cpu_memory_rw_debug(env, addr, mem_buf, len, 0) != 0) {
 831             put_packet (s, "E14");
 832         } else {
 833             memtohex(buf, mem_buf, len);
 834             put_packet(s, buf);
 835         }
 836         break;
 837     case 'M':
 838         addr = strtoull(p, (char **)&p, 16);
 839         if (*p == ',')
 840             p++;
 841         len = strtoull(p, (char **)&p, 16);
 842         if (*p == ':')
 843             p++;
 844         hextomem(mem_buf, p, len);
 845         if (cpu_memory_rw_debug(env, addr, mem_buf, len, 1) != 0)
 846             put_packet(s, "E14");
 847         else
 848             put_packet(s, "OK");
 849         break;
 850     case 'Z':
 851         type = strtoul(p, (char **)&p, 16);
 852         if (*p == ',')
 853             p++;
 854         addr = strtoull(p, (char **)&p, 16);
 855         if (*p == ',')
 856             p++;
 857         len = strtoull(p, (char **)&p, 16);
 858         if (type == 0 || type == 1) {
 859             if (cpu_breakpoint_insert(env, addr) < 0)
 860                 goto breakpoint_error;
 861             put_packet(s, "OK");
 862 #ifndef CONFIG_USER_ONLY
 863         } else if (type == 2) {
 864             if (cpu_watchpoint_insert(env, addr) < 0)
 865                 goto breakpoint_error;
 866             put_packet(s, "OK");
 867 #endif
 868         } else {
 869         breakpoint_error:
 870             put_packet(s, "E22");
 871         }
 872         break;
 873     case 'z':
 874         type = strtoul(p, (char **)&p, 16);
 875         if (*p == ',')
 876             p++;
 877         addr = strtoull(p, (char **)&p, 16);
 878         if (*p == ',')
 879             p++;
 880         len = strtoull(p, (char **)&p, 16);
 881         if (type == 0 || type == 1) {
 882             cpu_breakpoint_remove(env, addr);
 883             put_packet(s, "OK");
 884 #ifndef CONFIG_USER_ONLY
 885         } else if (type == 2) {
 886             cpu_watchpoint_remove(env, addr);
 887             put_packet(s, "OK");
 888 #endif
 889         } else {
 890             goto breakpoint_error;
 891         }
 892         break;
 893 #ifdef CONFIG_LINUX_USER
 894     case 'q':
 895         if (strncmp(p, "Offsets", 7) == 0) {
 896             TaskState *ts = env->opaque;
 897
 898             sprintf(buf, "Text=%x;Data=%x;Bss=%x", ts->info->code_offset,
 899                 ts->info->data_offset, ts->info->data_offset);
 900             put_packet(s, buf);
 901             break;
 902         }
 903         /* Fall through.  */
 904 #endif
 905     default:
 906         //        unknown_command:
 907         /* put empty packet */
 908         buf[0] = '\0';
 909         put_packet(s, buf);
 910         break;
 911     }
 912     return RS_IDLE;
 913 }
 914
 915 extern void tb_flush(CPUState *env);
 916
 917 #ifndef CONFIG_USER_ONLY
 918 static void gdb_vm_stopped(void *opaque, int reason)
 919 {
 920     GDBState *s = opaque;
 921     char buf[256];
 922     int ret;
 923
 924     if (s->state == RS_SYSCALL)
 925         return;
 926
 927     /* disable single step if it was enable */
 928     cpu_single_step(s->env, 0);
 929
 930     if (reason == EXCP_DEBUG) {
 931         if (s->env->watchpoint_hit) {
 932             snprintf(buf, sizeof(buf), "T%02xwatch:" TARGET_FMT_lx ";",
 933                      SIGTRAP,
 934                      s->env->watchpoint[s->env->watchpoint_hit - 1].vaddr);
 935             put_packet(s, buf);
 936             s->env->watchpoint_hit = 0;
 937             return;
 938         }
 939         tb_flush(s->env);
 940         ret = SIGTRAP;
 941     } else if (reason == EXCP_INTERRUPT) {
 942         ret = SIGINT;
 943     } else {
 944         ret = 0;
 945     }
 946     snprintf(buf, sizeof(buf), "S%02x", ret);
 947     put_packet(s, buf);
 948 }
 949 #endif
 950
 951 /* Send a gdb syscall request.
 952    This accepts limited printf-style format specifiers, specifically:
 953     %x - target_ulong argument printed in hex.
 954     %s - string pointer (target_ulong) and length (int) pair.  */
 955 void gdb_do_syscall(gdb_syscall_complete_cb cb, char *fmt, ...)
 956 {
 957     va_list va;
 958     char buf[256];
 959     char *p;
 960     target_ulong addr;
 961     GDBState *s;
 962
 963     s = gdb_syscall_state;
 964     if (!s)
 965         return;
 966     gdb_current_syscall_cb = cb;
 967     s->state = RS_SYSCALL;
 968 #ifndef CONFIG_USER_ONLY
 969     vm_stop(EXCP_DEBUG);
 970 #endif
 971     s->state = RS_IDLE;
 972     va_start(va, fmt);
 973     p = buf;
 974     *(p++) = 'F';
 975     while (*fmt) {
 976         if (*fmt == '%') {
 977             fmt++;
 978             switch (*fmt++) {
 979             case 'x':
 980                 addr = va_arg(va, target_ulong);
 981                 p += sprintf(p, TARGET_FMT_lx, addr);
 982                 break;
 983             case 's':
 984                 addr = va_arg(va, target_ulong);
 985                 p += sprintf(p, TARGET_FMT_lx "/%x", addr, va_arg(va, int));
 986                 break;
 987             default:
 988                 fprintf(stderr, "gdbstub: Bad syscall format string '%s'\n",
 989                         fmt - 1);
 990                 break;
 991             }
 992         } else {
 993             *(p++) = *(fmt++);
 994         }
 995     }
 996     va_end(va);
 997     put_packet(s, buf);
 998 #ifdef CONFIG_USER_ONLY
 999     gdb_handlesig(s->env, 0);
1000 #else
1001     cpu_interrupt(s->env, CPU_INTERRUPT_EXIT);
1002 #endif
1003 }
1004
1005 static void gdb_read_byte(GDBState *s, int ch)
1006 {
1007     CPUState *env = s->env;
1008     int i, csum;
1009     char reply[1];
1010
1011 #ifndef CONFIG_USER_ONLY
1012     if (s->last_packet_len) {
1013         /* Waiting for a response to the last packet.  If we see the start
1014            of a new command then abandon the previous response.  */
1015         if (ch == '-') {
1016 #ifdef DEBUG_GDB
1017             printf("Got NACK, retransmitting\n");
1018 #endif
1019             put_buffer(s, s->last_packet, s->last_packet_len);
1020         }
1021 #ifdef DEBUG_GDB
1022         else if (ch == '+')
1023             printf("Got ACK\n");
1024         else
1025             printf("Got '%c' when expecting ACK/NACK\n", ch);
1026 #endif
1027         if (ch == '+' || ch == '$')
1028             s->last_packet_len = 0;
1029         if (ch != '$')
1030             return;
1031     }
1032     if (vm_running) {
1033         /* when the CPU is running, we cannot do anything except stop
1034            it when receiving a char */
1035         vm_stop(EXCP_INTERRUPT);
1036     } else
1037 #endif
1038     {
1039         switch(s->state) {
1040         case RS_IDLE:
1041             if (ch == '$') {
1042                 s->line_buf_index = 0;
1043                 s->state = RS_GETLINE;
1044             }
1045             break;
1046         case RS_GETLINE:
1047             if (ch == '#') {
1048             s->state = RS_CHKSUM1;
1049             } else if (s->line_buf_index >= sizeof(s->line_buf) - 1) {
1050                 s->state = RS_IDLE;
1051             } else {
1052             s->line_buf[s->line_buf_index++] = ch;
1053             }
1054             break;
1055         case RS_CHKSUM1:
1056             s->line_buf[s->line_buf_index] = '\0';
1057             s->line_csum = fromhex(ch) << 4;
1058             s->state = RS_CHKSUM2;
1059             break;
1060         case RS_CHKSUM2:
1061             s->line_csum |= fromhex(ch);
1062             csum = 0;
1063             for(i = 0; i < s->line_buf_index; i++) {
1064                 csum += s->line_buf[i];
1065             }
1066             if (s->line_csum != (csum & 0xff)) {
1067                 reply[0] = '-';
1068                 put_buffer(s, reply, 1);
1069                 s->state = RS_IDLE;
1070             } else {
1071                 reply[0] = '+';
1072                 put_buffer(s, reply, 1);
1073                 s->state = gdb_handle_packet(s, env, s->line_buf);
1074             }
1075             break;
1076         default:
1077             abort();
1078         }
1079     }
1080 }
1081
1082 #ifdef CONFIG_USER_ONLY
1083 int
1084 gdb_handlesig (CPUState *env, int sig)
1085 {
1086   GDBState *s;
1087   char buf[256];
1088   int n;
1089
1090   if (gdbserver_fd < 0)
1091     return sig;
1092
1093   s = &gdbserver_state;
1094
1095   /* disable single step if it was enabled */
1096   cpu_single_step(env, 0);
1097   tb_flush(env);
1098
1099   if (sig != 0)
1100     {
1101       snprintf(buf, sizeof(buf), "S%02x", sig);
1102       put_packet(s, buf);
1103     }
1104
1105   sig = 0;
1106   s->state = RS_IDLE;
1107   s->running_state = 0;
1108   while (s->running_state == 0) {
1109       n = read (s->fd, buf, 256);
1110       if (n > 0)
1111         {
1112           int i;
1113
1114           for (i = 0; i < n; i++)
1115             gdb_read_byte (s, buf[i]);
1116         }
1117       else if (n == 0 || errno != EAGAIN)
1118         {
1119           /* XXX: Connection closed.  Should probably wait for annother
1120              connection before continuing.  */
1121           return sig;
1122         }
1123   }
1124   return sig;
1125 }
1126
1127 /* Tell the remote gdb that the process has exited.  */
1128 void gdb_exit(CPUState *env, int code)
1129 {
1130   GDBState *s;
1131   char buf[4];
1132
1133   if (gdbserver_fd < 0)
1134     return;
1135
1136   s = &gdbserver_state;
1137
1138   snprintf(buf, sizeof(buf), "W%02x", code);
1139   put_packet(s, buf);
1140 }
1141
1142
1143 static void gdb_accept(void *opaque)
1144 {
1145     GDBState *s;
1146     struct sockaddr_in sockaddr;
1147     socklen_t len;
1148     int val, fd;
1149
1150     for(;;) {
1151         len = sizeof(sockaddr);
1152         fd = accept(gdbserver_fd, (struct sockaddr *)&sockaddr, &len);
1153         if (fd < 0 && errno != EINTR) {
1154             perror("accept");
1155             return;
1156         } else if (fd >= 0) {
1157             break;
1158         }
1159     }
1160
1161     /* set short latency */
1162     val = 1;
1163     setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *)&val, sizeof(val));
1164
1165     s = &gdbserver_state;
1166     memset (s, 0, sizeof (GDBState));
1167     s->env = first_cpu; /* XXX: allow to change CPU */
1168     s->fd = fd;
1169
1170     gdb_syscall_state = s;
1171
1172     fcntl(fd, F_SETFL, O_NONBLOCK);
1173 }
1174
1175 static int gdbserver_open(int port)
1176 {
1177     struct sockaddr_in sockaddr;
1178     int fd, val, ret;
1179
1180     fd = socket(PF_INET, SOCK_STREAM, 0);
1181     if (fd < 0) {
1182         perror("socket");
1183         return -1;
1184     }
1185
1186     /* allow fast reuse */
1187     val = 1;
1188     setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&val, sizeof(val));
1189
1190     sockaddr.sin_family = AF_INET;
1191     sockaddr.sin_port = htons(port);
1192     sockaddr.sin_addr.s_addr = 0;
1193     ret = bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr));
1194     if (ret < 0) {
1195         perror("bind");
1196         return -1;
1197     }
1198     ret = listen(fd, 0);
1199     if (ret < 0) {
1200         perror("listen");
1201         return -1;
1202     }
1203     return fd;
1204 }
1205
1206 int gdbserver_start(int port)
1207 {
1208     gdbserver_fd = gdbserver_open(port);
1209     if (gdbserver_fd < 0)
1210         return -1;
1211     /* accept connections */
1212     gdb_accept (NULL);
1213     return 0;
1214 }
1215 #else
1216 static int gdb_chr_can_recieve(void *opaque)
1217 {
1218   return 1;
1219 }
1220
1221 static void gdb_chr_recieve(void *opaque, const uint8_t *buf, int size)
1222 {
1223     GDBState *s = opaque;
1224     int i;
1225
1226     for (i = 0; i < size; i++) {
1227         gdb_read_byte(s, buf[i]);
1228     }
1229 }
1230
1231 static void gdb_chr_event(void *opaque, int event)
1232 {
1233     switch (event) {
1234     case CHR_EVENT_RESET:
1235         vm_stop(EXCP_INTERRUPT);
1236         gdb_syscall_state = opaque;
1237         break;
1238     default:
1239         break;
1240     }
1241 }
1242
1243 int gdbserver_start(const char *port)
1244 {
1245     GDBState *s;
1246     char gdbstub_port_name[128];
1247     int port_num;
1248     char *p;
1249     CharDriverState *chr;
1250
1251     if (!port || !*port)
1252       return -1;
1253
1254     port_num = strtol(port, &p, 10);
1255     if (*p == 0) {
1256         /* A numeric value is interpreted as a port number.  */
1257         snprintf(gdbstub_port_name, sizeof(gdbstub_port_name),
1258                  "tcp::%d,nowait,nodelay,server", port_num);
1259         port = gdbstub_port_name;
1260     }
1261
1262     chr = qemu_chr_open(port);
1263     if (!chr)
1264         return -1;
1265
1266     s = qemu_mallocz(sizeof(GDBState));
1267     if (!s) {
1268         return -1;
1269     }
1270     s->env = first_cpu; /* XXX: allow to change CPU */
1271     s->chr = chr;
1272     qemu_chr_add_handlers(chr, gdb_chr_can_recieve, gdb_chr_recieve,
1273                           gdb_chr_event, s);
1274     qemu_add_vm_stop_handler(gdb_vm_stopped, s);
1275     return 0;
1276 }
1277 #endif