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         *(target_ulong *)ptr = tswapl(env->gpr[i]);
 553         ptr += sizeof(target_ulong);
 554       }
 555
 556     *(target_ulong *)ptr = tswapl(env->CP0_Status);
 557     ptr += sizeof(target_ulong);
 558
 559     *(target_ulong *)ptr = tswapl(env->LO);
 560     ptr += sizeof(target_ulong);
 561
 562     *(target_ulong *)ptr = tswapl(env->HI);
 563     ptr += sizeof(target_ulong);
 564
 565     *(target_ulong *)ptr = tswapl(env->CP0_BadVAddr);
 566     ptr += sizeof(target_ulong);
 567
 568     *(target_ulong *)ptr = tswapl(env->CP0_Cause);
 569     ptr += sizeof(target_ulong);
 570
 571     *(target_ulong *)ptr = tswapl(env->PC);
 572     ptr += sizeof(target_ulong);
 573
 574     if (env->CP0_Config1 & (1 << CP0C1_FP))
 575       {
 576         for (i = 0; i < 32; i++)
 577           {
 578             *(target_ulong *)ptr = tswapl(env->fpr[i].fs[FP_ENDIAN_IDX]);
 579             ptr += sizeof(target_ulong);
 580           }
 581
 582         *(target_ulong *)ptr = tswapl(env->fcr31);
 583         ptr += sizeof(target_ulong);
 584
 585         *(target_ulong *)ptr = tswapl(env->fcr0);
 586         ptr += sizeof(target_ulong);
 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(*(target_ulong *)ptr);
 615         ptr += sizeof(target_ulong);
 616       }
 617
 618     env->CP0_Status = tswapl(*(target_ulong *)ptr);
 619     ptr += sizeof(target_ulong);
 620
 621     env->LO = tswapl(*(target_ulong *)ptr);
 622     ptr += sizeof(target_ulong);
 623
 624     env->HI = tswapl(*(target_ulong *)ptr);
 625     ptr += sizeof(target_ulong);
 626
 627     env->CP0_BadVAddr = tswapl(*(target_ulong *)ptr);
 628     ptr += sizeof(target_ulong);
 629
 630     env->CP0_Cause = tswapl(*(target_ulong *)ptr);
 631     ptr += sizeof(target_ulong);
 632
 633     env->PC = tswapl(*(target_ulong *)ptr);
 634     ptr += sizeof(target_ulong);
 635
 636     if (env->CP0_Config1 & (1 << CP0C1_FP))
 637       {
 638         for (i = 0; i < 32; i++)
 639           {
 640             env->fpr[i].fs[FP_ENDIAN_IDX] = tswapl(*(target_ulong *)ptr);
 641             ptr += sizeof(target_ulong);
 642           }
 643
 644         env->fcr31 = tswapl(*(target_ulong *)ptr) & 0x0183FFFF;
 645         ptr += sizeof(target_ulong);
 646
 647         env->fcr0 = tswapl(*(target_ulong *)ptr);
 648         ptr += sizeof(target_ulong);
 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
 661 /* Hint: Use "set architecture sh4" in GDB to see fpu registers */
 662
 663 static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
 664 {
 665   uint32_t *ptr = (uint32_t *)mem_buf;
 666   int i;
 667
 668 #define SAVE(x) *ptr++=tswapl(x)
 669   if ((env->sr & (SR_MD | SR_RB)) == (SR_MD | SR_RB)) {
 670       for (i = 0; i < 8; i++) SAVE(env->gregs[i + 16]);
 671   } else {
 672       for (i = 0; i < 8; i++) SAVE(env->gregs[i]);
 673   }
 674   for (i = 8; i < 16; i++) SAVE(env->gregs[i]);
 675   SAVE (env->pc);
 676   SAVE (env->pr);
 677   SAVE (env->gbr);
 678   SAVE (env->vbr);
 679   SAVE (env->mach);
 680   SAVE (env->macl);
 681   SAVE (env->sr);
 682   SAVE (env->fpul);
 683   SAVE (env->fpscr);
 684   for (i = 0; i < 16; i++)
 685       SAVE(env->fregs[i + ((env->fpscr & FPSCR_FR) ? 16 : 0)]);
 686   SAVE (env->ssr);
 687   SAVE (env->spc);
 688   for (i = 0; i < 8; i++) SAVE(env->gregs[i]);
 689   for (i = 0; i < 8; i++) SAVE(env->gregs[i + 16]);
 690   return ((uint8_t *)ptr - mem_buf);
 691 }
 692
 693 static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
 694 {
 695   uint32_t *ptr = (uint32_t *)mem_buf;
 696   int i;
 697
 698 #define LOAD(x) (x)=*ptr++;
 699   if ((env->sr & (SR_MD | SR_RB)) == (SR_MD | SR_RB)) {
 700       for (i = 0; i < 8; i++) LOAD(env->gregs[i + 16]);
 701   } else {
 702       for (i = 0; i < 8; i++) LOAD(env->gregs[i]);
 703   }
 704   for (i = 8; i < 16; i++) LOAD(env->gregs[i]);
 705   LOAD (env->pc);
 706   LOAD (env->pr);
 707   LOAD (env->gbr);
 708   LOAD (env->vbr);
 709   LOAD (env->mach);
 710   LOAD (env->macl);
 711   LOAD (env->sr);
 712   LOAD (env->fpul);
 713   LOAD (env->fpscr);
 714   for (i = 0; i < 16; i++)
 715       LOAD(env->fregs[i + ((env->fpscr & FPSCR_FR) ? 16 : 0)]);
 716   LOAD (env->ssr);
 717   LOAD (env->spc);
 718   for (i = 0; i < 8; i++) LOAD(env->gregs[i]);
 719   for (i = 0; i < 8; i++) LOAD(env->gregs[i + 16]);
 720 }
 721 #else
 722 static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
 723 {
 724     return 0;
 725 }
 726
 727 static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
 728 {
 729 }
 730
 731 #endif
 732
 733 static int gdb_handle_packet(GDBState *s, CPUState *env, const char *line_buf)
 734 {
 735     const char *p;
 736     int ch, reg_size, type;
 737     char buf[4096];
 738     uint8_t mem_buf[2000];
 739     uint32_t *registers;
 740     target_ulong addr, len;
 741
 742 #ifdef DEBUG_GDB
 743     printf("command='%s'\n", line_buf);
 744 #endif
 745     p = line_buf;
 746     ch = *p++;
 747     switch(ch) {
 748     case '?':
 749         /* TODO: Make this return the correct value for user-mode.  */
 750         snprintf(buf, sizeof(buf), "S%02x", SIGTRAP);
 751         put_packet(s, buf);
 752         break;
 753     case 'c':
 754         if (*p != '\0') {
 755             addr = strtoull(p, (char **)&p, 16);
 756 #if defined(TARGET_I386)
 757             env->eip = addr;
 758 #elif defined (TARGET_PPC)
 759             env->nip = addr;
 760 #elif defined (TARGET_SPARC)
 761             env->pc = addr;
 762             env->npc = addr + 4;
 763 #elif defined (TARGET_ARM)
 764             env->regs[15] = addr;
 765 #elif defined (TARGET_SH4)
 766             env->pc = addr;
 767 #endif
 768         }
 769 #ifdef CONFIG_USER_ONLY
 770         s->running_state = 1;
 771 #else
 772         vm_start();
 773 #endif
 774         return RS_IDLE;
 775     case 's':
 776         if (*p != '\0') {
 777             addr = strtoul(p, (char **)&p, 16);
 778 #if defined(TARGET_I386)
 779             env->eip = addr;
 780 #elif defined (TARGET_PPC)
 781             env->nip = addr;
 782 #elif defined (TARGET_SPARC)
 783             env->pc = addr;
 784             env->npc = addr + 4;
 785 #elif defined (TARGET_ARM)
 786             env->regs[15] = addr;
 787 #elif defined (TARGET_SH4)
 788             env->pc = addr;
 789 #endif
 790         }
 791         cpu_single_step(env, 1);
 792 #ifdef CONFIG_USER_ONLY
 793         s->running_state = 1;
 794 #else
 795         vm_start();
 796 #endif
 797         return RS_IDLE;
 798     case 'F':
 799         {
 800             target_ulong ret;
 801             target_ulong err;
 802
 803             ret = strtoull(p, (char **)&p, 16);
 804             if (*p == ',') {
 805                 p++;
 806                 err = strtoull(p, (char **)&p, 16);
 807             } else {
 808                 err = 0;
 809             }
 810             if (*p == ',')
 811                 p++;
 812             type = *p;
 813             if (gdb_current_syscall_cb)
 814                 gdb_current_syscall_cb(s->env, ret, err);
 815             if (type == 'C') {
 816                 put_packet(s, "T02");
 817             } else {
 818 #ifdef CONFIG_USER_ONLY
 819                 s->running_state = 1;
 820 #else
 821                 vm_start();
 822 #endif
 823             }
 824         }
 825         break;
 826     case 'g':
 827         reg_size = cpu_gdb_read_registers(env, mem_buf);
 828         memtohex(buf, mem_buf, reg_size);
 829         put_packet(s, buf);
 830         break;
 831     case 'G':
 832         registers = (void *)mem_buf;
 833         len = strlen(p) / 2;
 834         hextomem((uint8_t *)registers, p, len);
 835         cpu_gdb_write_registers(env, mem_buf, len);
 836         put_packet(s, "OK");
 837         break;
 838     case 'm':
 839         addr = strtoull(p, (char **)&p, 16);
 840         if (*p == ',')
 841             p++;
 842         len = strtoull(p, NULL, 16);
 843         if (cpu_memory_rw_debug(env, addr, mem_buf, len, 0) != 0) {
 844             put_packet (s, "E14");
 845         } else {
 846             memtohex(buf, mem_buf, len);
 847             put_packet(s, buf);
 848         }
 849         break;
 850     case 'M':
 851         addr = strtoull(p, (char **)&p, 16);
 852         if (*p == ',')
 853             p++;
 854         len = strtoull(p, (char **)&p, 16);
 855         if (*p == ':')
 856             p++;
 857         hextomem(mem_buf, p, len);
 858         if (cpu_memory_rw_debug(env, addr, mem_buf, len, 1) != 0)
 859             put_packet(s, "E14");
 860         else
 861             put_packet(s, "OK");
 862         break;
 863     case 'Z':
 864         type = strtoul(p, (char **)&p, 16);
 865         if (*p == ',')
 866             p++;
 867         addr = strtoull(p, (char **)&p, 16);
 868         if (*p == ',')
 869             p++;
 870         len = strtoull(p, (char **)&p, 16);
 871         if (type == 0 || type == 1) {
 872             if (cpu_breakpoint_insert(env, addr) < 0)
 873                 goto breakpoint_error;
 874             put_packet(s, "OK");
 875 #ifndef CONFIG_USER_ONLY
 876         } else if (type == 2) {
 877             if (cpu_watchpoint_insert(env, addr) < 0)
 878                 goto breakpoint_error;
 879             put_packet(s, "OK");
 880 #endif
 881         } else {
 882         breakpoint_error:
 883             put_packet(s, "E22");
 884         }
 885         break;
 886     case 'z':
 887         type = strtoul(p, (char **)&p, 16);
 888         if (*p == ',')
 889             p++;
 890         addr = strtoull(p, (char **)&p, 16);
 891         if (*p == ',')
 892             p++;
 893         len = strtoull(p, (char **)&p, 16);
 894         if (type == 0 || type == 1) {
 895             cpu_breakpoint_remove(env, addr);
 896             put_packet(s, "OK");
 897 #ifndef CONFIG_USER_ONLY
 898         } else if (type == 2) {
 899             cpu_watchpoint_remove(env, addr);
 900             put_packet(s, "OK");
 901 #endif
 902         } else {
 903             goto breakpoint_error;
 904         }
 905         break;
 906 #ifdef CONFIG_LINUX_USER
 907     case 'q':
 908         if (strncmp(p, "Offsets", 7) == 0) {
 909             TaskState *ts = env->opaque;
 910
 911             sprintf(buf,
 912                     "Text=" TARGET_FMT_lx ";Data=" TARGET_FMT_lx ";Bss=" TARGET_FMT_lx,
 913                     ts->info->code_offset,
 914                     ts->info->data_offset,
 915                     ts->info->data_offset);
 916             put_packet(s, buf);
 917             break;
 918         }
 919         /* Fall through.  */
 920 #endif
 921     default:
 922         //        unknown_command:
 923         /* put empty packet */
 924         buf[0] = '\0';
 925         put_packet(s, buf);
 926         break;
 927     }
 928     return RS_IDLE;
 929 }
 930
 931 extern void tb_flush(CPUState *env);
 932
 933 #ifndef CONFIG_USER_ONLY
 934 static void gdb_vm_stopped(void *opaque, int reason)
 935 {
 936     GDBState *s = opaque;
 937     char buf[256];
 938     int ret;
 939
 940     if (s->state == RS_SYSCALL)
 941         return;
 942
 943     /* disable single step if it was enable */
 944     cpu_single_step(s->env, 0);
 945
 946     if (reason == EXCP_DEBUG) {
 947         if (s->env->watchpoint_hit) {
 948             snprintf(buf, sizeof(buf), "T%02xwatch:" TARGET_FMT_lx ";",
 949                      SIGTRAP,
 950                      s->env->watchpoint[s->env->watchpoint_hit - 1].vaddr);
 951             put_packet(s, buf);
 952             s->env->watchpoint_hit = 0;
 953             return;
 954         }
 955         tb_flush(s->env);
 956         ret = SIGTRAP;
 957     } else if (reason == EXCP_INTERRUPT) {
 958         ret = SIGINT;
 959     } else {
 960         ret = 0;
 961     }
 962     snprintf(buf, sizeof(buf), "S%02x", ret);
 963     put_packet(s, buf);
 964 }
 965 #endif
 966
 967 /* Send a gdb syscall request.
 968    This accepts limited printf-style format specifiers, specifically:
 969     %x  - target_ulong argument printed in hex.
 970     %lx - 64-bit argument printed in hex.
 971     %s  - string pointer (target_ulong) and length (int) pair.  */
 972 void gdb_do_syscall(gdb_syscall_complete_cb cb, char *fmt, ...)
 973 {
 974     va_list va;
 975     char buf[256];
 976     char *p;
 977     target_ulong addr;
 978     uint64_t i64;
 979     GDBState *s;
 980
 981     s = gdb_syscall_state;
 982     if (!s)
 983         return;
 984     gdb_current_syscall_cb = cb;
 985     s->state = RS_SYSCALL;
 986 #ifndef CONFIG_USER_ONLY
 987     vm_stop(EXCP_DEBUG);
 988 #endif
 989     s->state = RS_IDLE;
 990     va_start(va, fmt);
 991     p = buf;
 992     *(p++) = 'F';
 993     while (*fmt) {
 994         if (*fmt == '%') {
 995             fmt++;
 996             switch (*fmt++) {
 997             case 'x':
 998                 addr = va_arg(va, target_ulong);
 999                 p += sprintf(p, TARGET_FMT_lx, addr);
1000                 break;
1001             case 'l':
1002                 if (*(fmt++) != 'x')
1003                     goto bad_format;
1004                 i64 = va_arg(va, uint64_t);
1005                 p += sprintf(p, "%" PRIx64, i64);
1006                 break;
1007             case 's':
1008                 addr = va_arg(va, target_ulong);
1009                 p += sprintf(p, TARGET_FMT_lx "/%x", addr, va_arg(va, int));
1010                 break;
1011             default:
1012             bad_format:
1013                 fprintf(stderr, "gdbstub: Bad syscall format string '%s'\n",
1014                         fmt - 1);
1015                 break;
1016             }
1017         } else {
1018             *(p++) = *(fmt++);
1019         }
1020     }
1021     va_end(va);
1022     put_packet(s, buf);
1023 #ifdef CONFIG_USER_ONLY
1024     gdb_handlesig(s->env, 0);
1025 #else
1026     cpu_interrupt(s->env, CPU_INTERRUPT_EXIT);
1027 #endif
1028 }
1029
1030 static void gdb_read_byte(GDBState *s, int ch)
1031 {
1032     CPUState *env = s->env;
1033     int i, csum;
1034     char reply[1];
1035
1036 #ifndef CONFIG_USER_ONLY
1037     if (s->last_packet_len) {
1038         /* Waiting for a response to the last packet.  If we see the start
1039            of a new command then abandon the previous response.  */
1040         if (ch == '-') {
1041 #ifdef DEBUG_GDB
1042             printf("Got NACK, retransmitting\n");
1043 #endif
1044             put_buffer(s, s->last_packet, s->last_packet_len);
1045         }
1046 #ifdef DEBUG_GDB
1047         else if (ch == '+')
1048             printf("Got ACK\n");
1049         else
1050             printf("Got '%c' when expecting ACK/NACK\n", ch);
1051 #endif
1052         if (ch == '+' || ch == '$')
1053             s->last_packet_len = 0;
1054         if (ch != '$')
1055             return;
1056     }
1057     if (vm_running) {
1058         /* when the CPU is running, we cannot do anything except stop
1059            it when receiving a char */
1060         vm_stop(EXCP_INTERRUPT);
1061     } else
1062 #endif
1063     {
1064         switch(s->state) {
1065         case RS_IDLE:
1066             if (ch == '$') {
1067                 s->line_buf_index = 0;
1068                 s->state = RS_GETLINE;
1069             }
1070             break;
1071         case RS_GETLINE:
1072             if (ch == '#') {
1073             s->state = RS_CHKSUM1;
1074             } else if (s->line_buf_index >= sizeof(s->line_buf) - 1) {
1075                 s->state = RS_IDLE;
1076             } else {
1077             s->line_buf[s->line_buf_index++] = ch;
1078             }
1079             break;
1080         case RS_CHKSUM1:
1081             s->line_buf[s->line_buf_index] = '\0';
1082             s->line_csum = fromhex(ch) << 4;
1083             s->state = RS_CHKSUM2;
1084             break;
1085         case RS_CHKSUM2:
1086             s->line_csum |= fromhex(ch);
1087             csum = 0;
1088             for(i = 0; i < s->line_buf_index; i++) {
1089                 csum += s->line_buf[i];
1090             }
1091             if (s->line_csum != (csum & 0xff)) {
1092                 reply[0] = '-';
1093                 put_buffer(s, reply, 1);
1094                 s->state = RS_IDLE;
1095             } else {
1096                 reply[0] = '+';
1097                 put_buffer(s, reply, 1);
1098                 s->state = gdb_handle_packet(s, env, s->line_buf);
1099             }
1100             break;
1101         default:
1102             abort();
1103         }
1104     }
1105 }
1106
1107 #ifdef CONFIG_USER_ONLY
1108 int
1109 gdb_handlesig (CPUState *env, int sig)
1110 {
1111   GDBState *s;
1112   char buf[256];
1113   int n;
1114
1115   if (gdbserver_fd < 0)
1116     return sig;
1117
1118   s = &gdbserver_state;
1119
1120   /* disable single step if it was enabled */
1121   cpu_single_step(env, 0);
1122   tb_flush(env);
1123
1124   if (sig != 0)
1125     {
1126       snprintf(buf, sizeof(buf), "S%02x", sig);
1127       put_packet(s, buf);
1128     }
1129
1130   sig = 0;
1131   s->state = RS_IDLE;
1132   s->running_state = 0;
1133   while (s->running_state == 0) {
1134       n = read (s->fd, buf, 256);
1135       if (n > 0)
1136         {
1137           int i;
1138
1139           for (i = 0; i < n; i++)
1140             gdb_read_byte (s, buf[i]);
1141         }
1142       else if (n == 0 || errno != EAGAIN)
1143         {
1144           /* XXX: Connection closed.  Should probably wait for annother
1145              connection before continuing.  */
1146           return sig;
1147         }
1148   }
1149   return sig;
1150 }
1151
1152 /* Tell the remote gdb that the process has exited.  */
1153 void gdb_exit(CPUState *env, int code)
1154 {
1155   GDBState *s;
1156   char buf[4];
1157
1158   if (gdbserver_fd < 0)
1159     return;
1160
1161   s = &gdbserver_state;
1162
1163   snprintf(buf, sizeof(buf), "W%02x", code);
1164   put_packet(s, buf);
1165 }
1166
1167
1168 static void gdb_accept(void *opaque)
1169 {
1170     GDBState *s;
1171     struct sockaddr_in sockaddr;
1172     socklen_t len;
1173     int val, fd;
1174
1175     for(;;) {
1176         len = sizeof(sockaddr);
1177         fd = accept(gdbserver_fd, (struct sockaddr *)&sockaddr, &len);
1178         if (fd < 0 && errno != EINTR) {
1179             perror("accept");
1180             return;
1181         } else if (fd >= 0) {
1182             break;
1183         }
1184     }
1185
1186     /* set short latency */
1187     val = 1;
1188     setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *)&val, sizeof(val));
1189
1190     s = &gdbserver_state;
1191     memset (s, 0, sizeof (GDBState));
1192     s->env = first_cpu; /* XXX: allow to change CPU */
1193     s->fd = fd;
1194
1195     gdb_syscall_state = s;
1196
1197     fcntl(fd, F_SETFL, O_NONBLOCK);
1198 }
1199
1200 static int gdbserver_open(int port)
1201 {
1202     struct sockaddr_in sockaddr;
1203     int fd, val, ret;
1204
1205     fd = socket(PF_INET, SOCK_STREAM, 0);
1206     if (fd < 0) {
1207         perror("socket");
1208         return -1;
1209     }
1210
1211     /* allow fast reuse */
1212     val = 1;
1213     setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&val, sizeof(val));
1214
1215     sockaddr.sin_family = AF_INET;
1216     sockaddr.sin_port = htons(port);
1217     sockaddr.sin_addr.s_addr = 0;
1218     ret = bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr));
1219     if (ret < 0) {
1220         perror("bind");
1221         return -1;
1222     }
1223     ret = listen(fd, 0);
1224     if (ret < 0) {
1225         perror("listen");
1226         return -1;
1227     }
1228     return fd;
1229 }
1230
1231 int gdbserver_start(int port)
1232 {
1233     gdbserver_fd = gdbserver_open(port);
1234     if (gdbserver_fd < 0)
1235         return -1;
1236     /* accept connections */
1237     gdb_accept (NULL);
1238     return 0;
1239 }
1240 #else
1241 static int gdb_chr_can_recieve(void *opaque)
1242 {
1243   return 1;
1244 }
1245
1246 static void gdb_chr_recieve(void *opaque, const uint8_t *buf, int size)
1247 {
1248     GDBState *s = opaque;
1249     int i;
1250
1251     for (i = 0; i < size; i++) {
1252         gdb_read_byte(s, buf[i]);
1253     }
1254 }
1255
1256 static void gdb_chr_event(void *opaque, int event)
1257 {
1258     switch (event) {
1259     case CHR_EVENT_RESET:
1260         vm_stop(EXCP_INTERRUPT);
1261         gdb_syscall_state = opaque;
1262         break;
1263     default:
1264         break;
1265     }
1266 }
1267
1268 int gdbserver_start(const char *port)
1269 {
1270     GDBState *s;
1271     char gdbstub_port_name[128];
1272     int port_num;
1273     char *p;
1274     CharDriverState *chr;
1275
1276     if (!port || !*port)
1277       return -1;
1278
1279     port_num = strtol(port, &p, 10);
1280     if (*p == 0) {
1281         /* A numeric value is interpreted as a port number.  */
1282         snprintf(gdbstub_port_name, sizeof(gdbstub_port_name),
1283                  "tcp::%d,nowait,nodelay,server", port_num);
1284         port = gdbstub_port_name;
1285     }
1286
1287     chr = qemu_chr_open(port);
1288     if (!chr)
1289         return -1;
1290
1291     s = qemu_mallocz(sizeof(GDBState));
1292     if (!s) {
1293         return -1;
1294     }
1295     s->env = first_cpu; /* XXX: allow to change CPU */
1296     s->chr = chr;
1297     qemu_chr_add_handlers(chr, gdb_chr_can_recieve, gdb_chr_recieve,
1298                           gdb_chr_event, s);
1299     qemu_add_vm_stop_handler(gdb_vm_stopped, s);
1300     return 0;
1301 }
1302 #endif