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., 51 Franklin Street, Fifth Floor, Boston MA  02110-1301 USA
  19  */
  20 #include "config.h"
  21 #include "qemu-common.h"
  22 #ifdef CONFIG_USER_ONLY
  23 #include <stdlib.h>
  24 #include <stdio.h>
  25 #include <stdarg.h>
  26 #include <string.h>
  27 #include <errno.h>
  28 #include <unistd.h>
  29 #include <fcntl.h>
  30
  31 #include "qemu.h"
  32 #else
  33 #include "qemu-char.h"
  34 #include "sysemu.h"
  35 #include "gdbstub.h"
  36 #endif
  37
  38 #define MAX_PACKET_LENGTH 4096
  39
  40 #include "qemu_socket.h"
  41
  42
  43 enum {
  44     GDB_SIGNAL_0 = 0,
  45     GDB_SIGNAL_INT = 2,
  46     GDB_SIGNAL_TRAP = 5,
  47     GDB_SIGNAL_UNKNOWN = 143
  48 };
  49
  50 #ifdef CONFIG_USER_ONLY
  51
  52 /* Map target signal numbers to GDB protocol signal numbers and vice
  53  * versa.  For user emulation's currently supported systems, we can
  54  * assume most signals are defined.
  55  */
  56
  57 static int gdb_signal_table[] = {
  58     0,
  59     TARGET_SIGHUP,
  60     TARGET_SIGINT,
  61     TARGET_SIGQUIT,
  62     TARGET_SIGILL,
  63     TARGET_SIGTRAP,
  64     TARGET_SIGABRT,
  65     -1, /* SIGEMT */
  66     TARGET_SIGFPE,
  67     TARGET_SIGKILL,
  68     TARGET_SIGBUS,
  69     TARGET_SIGSEGV,
  70     TARGET_SIGSYS,
  71     TARGET_SIGPIPE,
  72     TARGET_SIGALRM,
  73     TARGET_SIGTERM,
  74     TARGET_SIGURG,
  75     TARGET_SIGSTOP,
  76     TARGET_SIGTSTP,
  77     TARGET_SIGCONT,
  78     TARGET_SIGCHLD,
  79     TARGET_SIGTTIN,
  80     TARGET_SIGTTOU,
  81     TARGET_SIGIO,
  82     TARGET_SIGXCPU,
  83     TARGET_SIGXFSZ,
  84     TARGET_SIGVTALRM,
  85     TARGET_SIGPROF,
  86     TARGET_SIGWINCH,
  87     -1, /* SIGLOST */
  88     TARGET_SIGUSR1,
  89     TARGET_SIGUSR2,
  90 #ifdef TARGET_SIGPWR
  91     TARGET_SIGPWR,
  92 #else
  93     -1,
  94 #endif
  95     -1, /* SIGPOLL */
  96     -1,
  97     -1,
  98     -1,
  99     -1,
 100     -1,
 101     -1,
 102     -1,
 103     -1,
 104     -1,
 105     -1,
 106     -1,
 107 #ifdef __SIGRTMIN
 108     __SIGRTMIN + 1,
 109     __SIGRTMIN + 2,
 110     __SIGRTMIN + 3,
 111     __SIGRTMIN + 4,
 112     __SIGRTMIN + 5,
 113     __SIGRTMIN + 6,
 114     __SIGRTMIN + 7,
 115     __SIGRTMIN + 8,
 116     __SIGRTMIN + 9,
 117     __SIGRTMIN + 10,
 118     __SIGRTMIN + 11,
 119     __SIGRTMIN + 12,
 120     __SIGRTMIN + 13,
 121     __SIGRTMIN + 14,
 122     __SIGRTMIN + 15,
 123     __SIGRTMIN + 16,
 124     __SIGRTMIN + 17,
 125     __SIGRTMIN + 18,
 126     __SIGRTMIN + 19,
 127     __SIGRTMIN + 20,
 128     __SIGRTMIN + 21,
 129     __SIGRTMIN + 22,
 130     __SIGRTMIN + 23,
 131     __SIGRTMIN + 24,
 132     __SIGRTMIN + 25,
 133     __SIGRTMIN + 26,
 134     __SIGRTMIN + 27,
 135     __SIGRTMIN + 28,
 136     __SIGRTMIN + 29,
 137     __SIGRTMIN + 30,
 138     __SIGRTMIN + 31,
 139     -1, /* SIGCANCEL */
 140     __SIGRTMIN,
 141     __SIGRTMIN + 32,
 142     __SIGRTMIN + 33,
 143     __SIGRTMIN + 34,
 144     __SIGRTMIN + 35,
 145     __SIGRTMIN + 36,
 146     __SIGRTMIN + 37,
 147     __SIGRTMIN + 38,
 148     __SIGRTMIN + 39,
 149     __SIGRTMIN + 40,
 150     __SIGRTMIN + 41,
 151     __SIGRTMIN + 42,
 152     __SIGRTMIN + 43,
 153     __SIGRTMIN + 44,
 154     __SIGRTMIN + 45,
 155     __SIGRTMIN + 46,
 156     __SIGRTMIN + 47,
 157     __SIGRTMIN + 48,
 158     __SIGRTMIN + 49,
 159     __SIGRTMIN + 50,
 160     __SIGRTMIN + 51,
 161     __SIGRTMIN + 52,
 162     __SIGRTMIN + 53,
 163     __SIGRTMIN + 54,
 164     __SIGRTMIN + 55,
 165     __SIGRTMIN + 56,
 166     __SIGRTMIN + 57,
 167     __SIGRTMIN + 58,
 168     __SIGRTMIN + 59,
 169     __SIGRTMIN + 60,
 170     __SIGRTMIN + 61,
 171     __SIGRTMIN + 62,
 172     __SIGRTMIN + 63,
 173     __SIGRTMIN + 64,
 174     __SIGRTMIN + 65,
 175     __SIGRTMIN + 66,
 176     __SIGRTMIN + 67,
 177     __SIGRTMIN + 68,
 178     __SIGRTMIN + 69,
 179     __SIGRTMIN + 70,
 180     __SIGRTMIN + 71,
 181     __SIGRTMIN + 72,
 182     __SIGRTMIN + 73,
 183     __SIGRTMIN + 74,
 184     __SIGRTMIN + 75,
 185     __SIGRTMIN + 76,
 186     __SIGRTMIN + 77,
 187     __SIGRTMIN + 78,
 188     __SIGRTMIN + 79,
 189     __SIGRTMIN + 80,
 190     __SIGRTMIN + 81,
 191     __SIGRTMIN + 82,
 192     __SIGRTMIN + 83,
 193     __SIGRTMIN + 84,
 194     __SIGRTMIN + 85,
 195     __SIGRTMIN + 86,
 196     __SIGRTMIN + 87,
 197     __SIGRTMIN + 88,
 198     __SIGRTMIN + 89,
 199     __SIGRTMIN + 90,
 200     __SIGRTMIN + 91,
 201     __SIGRTMIN + 92,
 202     __SIGRTMIN + 93,
 203     __SIGRTMIN + 94,
 204     __SIGRTMIN + 95,
 205     -1, /* SIGINFO */
 206     -1, /* UNKNOWN */
 207     -1, /* DEFAULT */
 208     -1,
 209     -1,
 210     -1,
 211     -1,
 212     -1,
 213     -1
 214 #endif
 215 };
 216 #else
 217 /* In system mode we only need SIGINT and SIGTRAP; other signals
 218    are not yet supported.  */
 219
 220 enum {
 221     TARGET_SIGINT = 2,
 222     TARGET_SIGTRAP = 5
 223 };
 224
 225 static int gdb_signal_table[] = {
 226     -1,
 227     -1,
 228     TARGET_SIGINT,
 229     -1,
 230     -1,
 231     TARGET_SIGTRAP
 232 };
 233 #endif
 234
 235 #ifdef CONFIG_USER_ONLY
 236 static int target_signal_to_gdb (int sig)
 237 {
 238     int i;
 239     for (i = 0; i < ARRAY_SIZE (gdb_signal_table); i++)
 240         if (gdb_signal_table[i] == sig)
 241             return i;
 242     return GDB_SIGNAL_UNKNOWN;
 243 }
 244 #endif
 245
 246 static int gdb_signal_to_target (int sig)
 247 {
 248     if (sig < ARRAY_SIZE (gdb_signal_table))
 249         return gdb_signal_table[sig];
 250     else
 251         return -1;
 252 }
 253
 254 //#define DEBUG_GDB
 255
 256 typedef struct GDBRegisterState {
 257     int base_reg;
 258     int num_regs;
 259     gdb_reg_cb get_reg;
 260     gdb_reg_cb set_reg;
 261     const char *xml;
 262     struct GDBRegisterState *next;
 263 } GDBRegisterState;
 264
 265 enum RSState {
 266     RS_IDLE,
 267     RS_GETLINE,
 268     RS_CHKSUM1,
 269     RS_CHKSUM2,
 270     RS_SYSCALL,
 271 };
 272 typedef struct GDBState {
 273     CPUState *c_cpu; /* current CPU for step/continue ops */
 274     CPUState *g_cpu; /* current CPU for other ops */
 275     CPUState *query_cpu; /* for q{f|s}ThreadInfo */
 276     enum RSState state; /* parsing state */
 277     char line_buf[MAX_PACKET_LENGTH];
 278     int line_buf_index;
 279     int line_csum;
 280     uint8_t last_packet[MAX_PACKET_LENGTH + 4];
 281     int last_packet_len;
 282     int signal;
 283 #ifdef CONFIG_USER_ONLY
 284     int fd;
 285     int running_state;
 286 #else
 287     CharDriverState *chr;
 288 #endif
 289 } GDBState;
 290
 291 /* By default use no IRQs and no timers while single stepping so as to
 292  * make single stepping like an ICE HW step.
 293  */
 294 static int sstep_flags = SSTEP_ENABLE|SSTEP_NOIRQ|SSTEP_NOTIMER;
 295
 296 static GDBState *gdbserver_state;
 297
 298 /* This is an ugly hack to cope with both new and old gdb.
 299    If gdb sends qXfer:features:read then assume we're talking to a newish
 300    gdb that understands target descriptions.  */
 301 static int gdb_has_xml;
 302
 303 #ifdef CONFIG_USER_ONLY
 304 /* XXX: This is not thread safe.  Do we care?  */
 305 static int gdbserver_fd = -1;
 306
 307 static int get_char(GDBState *s)
 308 {
 309     uint8_t ch;
 310     int ret;
 311
 312     for(;;) {
 313         ret = recv(s->fd, &ch, 1, 0);
 314         if (ret < 0) {
 315             if (errno == ECONNRESET)
 316                 s->fd = -1;
 317             if (errno != EINTR && errno != EAGAIN)
 318                 return -1;
 319         } else if (ret == 0) {
 320             close(s->fd);
 321             s->fd = -1;
 322             return -1;
 323         } else {
 324             break;
 325         }
 326     }
 327     return ch;
 328 }
 329 #endif
 330
 331 static gdb_syscall_complete_cb gdb_current_syscall_cb;
 332
 333 enum {
 334     GDB_SYS_UNKNOWN,
 335     GDB_SYS_ENABLED,
 336     GDB_SYS_DISABLED,
 337 } gdb_syscall_mode;
 338
 339 /* If gdb is connected when the first semihosting syscall occurs then use
 340    remote gdb syscalls.  Otherwise use native file IO.  */
 341 int use_gdb_syscalls(void)
 342 {
 343     if (gdb_syscall_mode == GDB_SYS_UNKNOWN) {
 344         gdb_syscall_mode = (gdbserver_state ? GDB_SYS_ENABLED
 345                                             : GDB_SYS_DISABLED);
 346     }
 347     return gdb_syscall_mode == GDB_SYS_ENABLED;
 348 }
 349
 350 /* Resume execution.  */
 351 static inline void gdb_continue(GDBState *s)
 352 {
 353 #ifdef CONFIG_USER_ONLY
 354     s->running_state = 1;
 355 #else
 356     vm_start();
 357 #endif
 358 }
 359
 360 static void put_buffer(GDBState *s, const uint8_t *buf, int len)
 361 {
 362 #ifdef CONFIG_USER_ONLY
 363     int ret;
 364
 365     while (len > 0) {
 366         ret = send(s->fd, buf, len, 0);
 367         if (ret < 0) {
 368             if (errno != EINTR && errno != EAGAIN)
 369                 return;
 370         } else {
 371             buf += ret;
 372             len -= ret;
 373         }
 374     }
 375 #else
 376     qemu_chr_write(s->chr, buf, len);
 377 #endif
 378 }
 379
 380 static inline int fromhex(int v)
 381 {
 382     if (v >= '0' && v <= '9')
 383         return v - '0';
 384     else if (v >= 'A' && v <= 'F')
 385         return v - 'A' + 10;
 386     else if (v >= 'a' && v <= 'f')
 387         return v - 'a' + 10;
 388     else
 389         return 0;
 390 }
 391
 392 static inline int tohex(int v)
 393 {
 394     if (v < 10)
 395         return v + '0';
 396     else
 397         return v - 10 + 'a';
 398 }
 399
 400 static void memtohex(char *buf, const uint8_t *mem, int len)
 401 {
 402     int i, c;
 403     char *q;
 404     q = buf;
 405     for(i = 0; i < len; i++) {
 406         c = mem[i];
 407         *q++ = tohex(c >> 4);
 408         *q++ = tohex(c & 0xf);
 409     }
 410     *q = '\0';
 411 }
 412
 413 static void hextomem(uint8_t *mem, const char *buf, int len)
 414 {
 415     int i;
 416
 417     for(i = 0; i < len; i++) {
 418         mem[i] = (fromhex(buf[0]) << 4) | fromhex(buf[1]);
 419         buf += 2;
 420     }
 421 }
 422
 423 /* return -1 if error, 0 if OK */
 424 static int put_packet_binary(GDBState *s, const char *buf, int len)
 425 {
 426     int csum, i;
 427     uint8_t *p;
 428
 429     for(;;) {
 430         p = s->last_packet;
 431         *(p++) = '$';
 432         memcpy(p, buf, len);
 433         p += len;
 434         csum = 0;
 435         for(i = 0; i < len; i++) {
 436             csum += buf[i];
 437         }
 438         *(p++) = '#';
 439         *(p++) = tohex((csum >> 4) & 0xf);
 440         *(p++) = tohex((csum) & 0xf);
 441
 442         s->last_packet_len = p - s->last_packet;
 443         put_buffer(s, (uint8_t *)s->last_packet, s->last_packet_len);
 444
 445 #ifdef CONFIG_USER_ONLY
 446         i = get_char(s);
 447         if (i < 0)
 448             return -1;
 449         if (i == '+')
 450             break;
 451 #else
 452         break;
 453 #endif
 454     }
 455     return 0;
 456 }
 457
 458 /* return -1 if error, 0 if OK */
 459 static int put_packet(GDBState *s, const char *buf)
 460 {
 461 #ifdef DEBUG_GDB
 462     printf("reply='%s'\n", buf);
 463 #endif
 464
 465     return put_packet_binary(s, buf, strlen(buf));
 466 }
 467
 468 /* The GDB remote protocol transfers values in target byte order.  This means
 469    we can use the raw memory access routines to access the value buffer.
 470    Conveniently, these also handle the case where the buffer is mis-aligned.
 471  */
 472 #define GET_REG8(val) do { \
 473     stb_p(mem_buf, val); \
 474     return 1; \
 475     } while(0)
 476 #define GET_REG16(val) do { \
 477     stw_p(mem_buf, val); \
 478     return 2; \
 479     } while(0)
 480 #define GET_REG32(val) do { \
 481     stl_p(mem_buf, val); \
 482     return 4; \
 483     } while(0)
 484 #define GET_REG64(val) do { \
 485     stq_p(mem_buf, val); \
 486     return 8; \
 487     } while(0)
 488
 489 #if TARGET_LONG_BITS == 64
 490 #define GET_REGL(val) GET_REG64(val)
 491 #define ldtul_p(addr) ldq_p(addr)
 492 #else
 493 #define GET_REGL(val) GET_REG32(val)
 494 #define ldtul_p(addr) ldl_p(addr)
 495 #endif
 496
 497 #if defined(TARGET_I386)
 498
 499 #ifdef TARGET_X86_64
 500 static const int gpr_map[16] = {
 501     R_EAX, R_EBX, R_ECX, R_EDX, R_ESI, R_EDI, R_EBP, R_ESP,
 502     8, 9, 10, 11, 12, 13, 14, 15
 503 };
 504 #else
 505 static const int gpr_map[8] = {0, 1, 2, 3, 4, 5, 6, 7};
 506 #endif
 507
 508 #define NUM_CORE_REGS (CPU_NB_REGS * 2 + 25)
 509
 510 static int cpu_gdb_read_register(CPUState *env, uint8_t *mem_buf, int n)
 511 {
 512     if (n < CPU_NB_REGS) {
 513         GET_REGL(env->regs[gpr_map[n]]);
 514     } else if (n >= CPU_NB_REGS + 8 && n < CPU_NB_REGS + 16) {
 515         /* FIXME: byteswap float values.  */
 516 #ifdef USE_X86LDOUBLE
 517         memcpy(mem_buf, &env->fpregs[n - (CPU_NB_REGS + 8)], 10);
 518 #else
 519         memset(mem_buf, 0, 10);
 520 #endif
 521         return 10;
 522     } else if (n >= CPU_NB_REGS + 24) {
 523         n -= CPU_NB_REGS + 24;
 524         if (n < CPU_NB_REGS) {
 525             stq_p(mem_buf, env->xmm_regs[n].XMM_Q(0));
 526             stq_p(mem_buf + 8, env->xmm_regs[n].XMM_Q(1));
 527             return 16;
 528         } else if (n == CPU_NB_REGS) {
 529             GET_REG32(env->mxcsr);
 530         }
 531     } else {
 532         n -= CPU_NB_REGS;
 533         switch (n) {
 534         case 0: GET_REGL(env->eip);
 535         case 1: GET_REG32(env->eflags);
 536         case 2: GET_REG32(env->segs[R_CS].selector);
 537         case 3: GET_REG32(env->segs[R_SS].selector);
 538         case 4: GET_REG32(env->segs[R_DS].selector);
 539         case 5: GET_REG32(env->segs[R_ES].selector);
 540         case 6: GET_REG32(env->segs[R_FS].selector);
 541         case 7: GET_REG32(env->segs[R_GS].selector);
 542         /* 8...15 x87 regs.  */
 543         case 16: GET_REG32(env->fpuc);
 544         case 17: GET_REG32((env->fpus & ~0x3800) | (env->fpstt & 0x7) << 11);
 545         case 18: GET_REG32(0); /* ftag */
 546         case 19: GET_REG32(0); /* fiseg */
 547         case 20: GET_REG32(0); /* fioff */
 548         case 21: GET_REG32(0); /* foseg */
 549         case 22: GET_REG32(0); /* fooff */
 550         case 23: GET_REG32(0); /* fop */
 551         /* 24+ xmm regs.  */
 552         }
 553     }
 554     return 0;
 555 }
 556
 557 static int cpu_gdb_write_register(CPUState *env, uint8_t *mem_buf, int i)
 558 {
 559     uint32_t tmp;
 560
 561     if (i < CPU_NB_REGS) {
 562         env->regs[gpr_map[i]] = ldtul_p(mem_buf);
 563         return sizeof(target_ulong);
 564     } else if (i >= CPU_NB_REGS + 8 && i < CPU_NB_REGS + 16) {
 565         i -= CPU_NB_REGS + 8;
 566 #ifdef USE_X86LDOUBLE
 567         memcpy(&env->fpregs[i], mem_buf, 10);
 568 #endif
 569         return 10;
 570     } else if (i >= CPU_NB_REGS + 24) {
 571         i -= CPU_NB_REGS + 24;
 572         if (i < CPU_NB_REGS) {
 573             env->xmm_regs[i].XMM_Q(0) = ldq_p(mem_buf);
 574             env->xmm_regs[i].XMM_Q(1) = ldq_p(mem_buf + 8);
 575             return 16;
 576         } else if (i == CPU_NB_REGS) {
 577             env->mxcsr = ldl_p(mem_buf);
 578             return 4;
 579         }
 580     } else {
 581         i -= CPU_NB_REGS;
 582         switch (i) {
 583         case 0: env->eip = ldtul_p(mem_buf); return sizeof(target_ulong);
 584         case 1: env->eflags = ldl_p(mem_buf); return 4;
 585 #if defined(CONFIG_USER_ONLY)
 586 #define LOAD_SEG(index, sreg)\
 587             tmp = ldl_p(mem_buf);\
 588             if (tmp != env->segs[sreg].selector)\
 589                 cpu_x86_load_seg(env, sreg, tmp);
 590 #else
 591 /* FIXME: Honor segment registers.  Needs to avoid raising an exception
 592    when the selector is invalid.  */
 593 #define LOAD_SEG(index, sreg) do {} while(0)
 594 #endif
 595         case 2: LOAD_SEG(10, R_CS); return 4;
 596         case 3: LOAD_SEG(11, R_SS); return 4;
 597         case 4: LOAD_SEG(12, R_DS); return 4;
 598         case 5: LOAD_SEG(13, R_ES); return 4;
 599         case 6: LOAD_SEG(14, R_FS); return 4;
 600         case 7: LOAD_SEG(15, R_GS); return 4;
 601         /* 8...15 x87 regs.  */
 602         case 16: env->fpuc = ldl_p(mem_buf); return 4;
 603         case 17:
 604                  tmp = ldl_p(mem_buf);
 605                  env->fpstt = (tmp >> 11) & 7;
 606                  env->fpus = tmp & ~0x3800;
 607                  return 4;
 608         case 18: /* ftag */ return 4;
 609         case 19: /* fiseg */ return 4;
 610         case 20: /* fioff */ return 4;
 611         case 21: /* foseg */ return 4;
 612         case 22: /* fooff */ return 4;
 613         case 23: /* fop */ return 4;
 614         /* 24+ xmm regs.  */
 615         }
 616     }
 617     /* Unrecognised register.  */
 618     return 0;
 619 }
 620
 621 #elif defined (TARGET_PPC)
 622
 623 #define NUM_CORE_REGS 71
 624
 625 static int cpu_gdb_read_register(CPUState *env, uint8_t *mem_buf, int n)
 626 {
 627     if (n < 32) {
 628         /* gprs */
 629         GET_REGL(env->gpr[n]);
 630     } else if (n < 64) {
 631         /* fprs */
 632         stfq_p(mem_buf, env->fpr[n-32]);
 633         return 8;
 634     } else {
 635         switch (n) {
 636         case 64: GET_REGL(env->nip);
 637         case 65: GET_REGL(env->msr);
 638         case 66:
 639             {
 640                 uint32_t cr = 0;
 641                 int i;
 642                 for (i = 0; i < 8; i++)
 643                     cr |= env->crf[i] << (32 - ((i + 1) * 4));
 644                 GET_REG32(cr);
 645             }
 646         case 67: GET_REGL(env->lr);
 647         case 68: GET_REGL(env->ctr);
 648         case 69: GET_REGL(env->xer);
 649         case 70: GET_REG32(0); /* fpscr */
 650         }
 651     }
 652     return 0;
 653 }
 654
 655 static int cpu_gdb_write_register(CPUState *env, uint8_t *mem_buf, int n)
 656 {
 657     if (n < 32) {
 658         /* gprs */
 659         env->gpr[n] = ldtul_p(mem_buf);
 660         return sizeof(target_ulong);
 661     } else if (n < 64) {
 662         /* fprs */
 663         env->fpr[n-32] = ldfq_p(mem_buf);
 664         return 8;
 665     } else {
 666         switch (n) {
 667         case 64:
 668             env->nip = ldtul_p(mem_buf);
 669             return sizeof(target_ulong);
 670         case 65:
 671             ppc_store_msr(env, ldtul_p(mem_buf));
 672             return sizeof(target_ulong);
 673         case 66:
 674             {
 675                 uint32_t cr = ldl_p(mem_buf);
 676                 int i;
 677                 for (i = 0; i < 8; i++)
 678                     env->crf[i] = (cr >> (32 - ((i + 1) * 4))) & 0xF;
 679                 return 4;
 680             }
 681         case 67:
 682             env->lr = ldtul_p(mem_buf);
 683             return sizeof(target_ulong);
 684         case 68:
 685             env->ctr = ldtul_p(mem_buf);
 686             return sizeof(target_ulong);
 687         case 69:
 688             env->xer = ldtul_p(mem_buf);
 689             return sizeof(target_ulong);
 690         case 70:
 691             /* fpscr */
 692             return 4;
 693         }
 694     }
 695     return 0;
 696 }
 697
 698 #elif defined (TARGET_SPARC)
 699
 700 #if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
 701 #define NUM_CORE_REGS 86
 702 #else
 703 #define NUM_CORE_REGS 72
 704 #endif
 705
 706 #ifdef TARGET_ABI32
 707 #define GET_REGA(val) GET_REG32(val)
 708 #else
 709 #define GET_REGA(val) GET_REGL(val)
 710 #endif
 711
 712 static int cpu_gdb_read_register(CPUState *env, uint8_t *mem_buf, int n)
 713 {
 714     if (n < 8) {
 715         /* g0..g7 */
 716         GET_REGA(env->gregs[n]);
 717     }
 718     if (n < 32) {
 719         /* register window */
 720         GET_REGA(env->regwptr[n - 8]);
 721     }
 722 #if defined(TARGET_ABI32) || !defined(TARGET_SPARC64)
 723     if (n < 64) {
 724         /* fprs */
 725         GET_REG32(*((uint32_t *)&env->fpr[n - 32]));
 726     }
 727     /* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */
 728     switch (n) {
 729     case 64: GET_REGA(env->y);
 730     case 65: GET_REGA(GET_PSR(env));
 731     case 66: GET_REGA(env->wim);
 732     case 67: GET_REGA(env->tbr);
 733     case 68: GET_REGA(env->pc);
 734     case 69: GET_REGA(env->npc);
 735     case 70: GET_REGA(env->fsr);
 736     case 71: GET_REGA(0); /* csr */
 737     default: GET_REGA(0);
 738     }
 739 #else
 740     if (n < 64) {
 741         /* f0-f31 */
 742         GET_REG32(*((uint32_t *)&env->fpr[n - 32]));
 743     }
 744     if (n < 80) {
 745         /* f32-f62 (double width, even numbers only) */
 746         uint64_t val;
 747
 748         val = (uint64_t)*((uint32_t *)&env->fpr[(n - 64) * 2 + 32]) << 32;
 749         val |= *((uint32_t *)&env->fpr[(n - 64) * 2 + 33]);
 750         GET_REG64(val);
 751     }
 752     switch (n) {
 753     case 80: GET_REGL(env->pc);
 754     case 81: GET_REGL(env->npc);
 755     case 82: GET_REGL(((uint64_t)GET_CCR(env) << 32) |
 756                            ((env->asi & 0xff) << 24) |
 757                            ((env->pstate & 0xfff) << 8) |
 758                            GET_CWP64(env));
 759     case 83: GET_REGL(env->fsr);
 760     case 84: GET_REGL(env->fprs);
 761     case 85: GET_REGL(env->y);
 762     }
 763 #endif
 764     return 0;
 765 }
 766
 767 static int cpu_gdb_write_register(CPUState *env, uint8_t *mem_buf, int n)
 768 {
 769 #if defined(TARGET_ABI32)
 770     abi_ulong tmp;
 771
 772     tmp = ldl_p(mem_buf);
 773 #else
 774     target_ulong tmp;
 775
 776     tmp = ldtul_p(mem_buf);
 777 #endif
 778
 779     if (n < 8) {
 780         /* g0..g7 */
 781         env->gregs[n] = tmp;
 782     } else if (n < 32) {
 783         /* register window */
 784         env->regwptr[n - 8] = tmp;
 785     }
 786 #if defined(TARGET_ABI32) || !defined(TARGET_SPARC64)
 787     else if (n < 64) {
 788         /* fprs */
 789         *((uint32_t *)&env->fpr[n - 32]) = tmp;
 790     } else {
 791         /* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */
 792         switch (n) {
 793         case 64: env->y = tmp; break;
 794         case 65: PUT_PSR(env, tmp); break;
 795         case 66: env->wim = tmp; break;
 796         case 67: env->tbr = tmp; break;
 797         case 68: env->pc = tmp; break;
 798         case 69: env->npc = tmp; break;
 799         case 70: env->fsr = tmp; break;
 800         default: return 0;
 801         }
 802     }
 803     return 4;
 804 #else
 805     else if (n < 64) {
 806         /* f0-f31 */
 807         env->fpr[n] = ldfl_p(mem_buf);
 808         return 4;
 809     } else if (n < 80) {
 810         /* f32-f62 (double width, even numbers only) */
 811         *((uint32_t *)&env->fpr[(n - 64) * 2 + 32]) = tmp >> 32;
 812         *((uint32_t *)&env->fpr[(n - 64) * 2 + 33]) = tmp;
 813     } else {
 814         switch (n) {
 815         case 80: env->pc = tmp; break;
 816         case 81: env->npc = tmp; break;
 817         case 82:
 818             PUT_CCR(env, tmp >> 32);
 819             env->asi = (tmp >> 24) & 0xff;
 820             env->pstate = (tmp >> 8) & 0xfff;
 821             PUT_CWP64(env, tmp & 0xff);
 822             break;
 823         case 83: env->fsr = tmp; break;
 824         case 84: env->fprs = tmp; break;
 825         case 85: env->y = tmp; break;
 826         default: return 0;
 827         }
 828     }
 829     return 8;
 830 #endif
 831 }
 832 #elif defined (TARGET_ARM)
 833
 834 /* Old gdb always expect FPA registers.  Newer (xml-aware) gdb only expect
 835    whatever the target description contains.  Due to a historical mishap
 836    the FPA registers appear in between core integer regs and the CPSR.
 837    We hack round this by giving the FPA regs zero size when talking to a
 838    newer gdb.  */
 839 #define NUM_CORE_REGS 26
 840 #define GDB_CORE_XML "arm-core.xml"
 841
 842 static int cpu_gdb_read_register(CPUState *env, uint8_t *mem_buf, int n)
 843 {
 844     if (n < 16) {
 845         /* Core integer register.  */
 846         GET_REG32(env->regs[n]);
 847     }
 848     if (n < 24) {
 849         /* FPA registers.  */
 850         if (gdb_has_xml)
 851             return 0;
 852         memset(mem_buf, 0, 12);
 853         return 12;
 854     }
 855     switch (n) {
 856     case 24:
 857         /* FPA status register.  */
 858         if (gdb_has_xml)
 859             return 0;
 860         GET_REG32(0);
 861     case 25:
 862         /* CPSR */
 863         GET_REG32(cpsr_read(env));
 864     }
 865     /* Unknown register.  */
 866     return 0;
 867 }
 868
 869 static int cpu_gdb_write_register(CPUState *env, uint8_t *mem_buf, int n)
 870 {
 871     uint32_t tmp;
 872
 873     tmp = ldl_p(mem_buf);
 874
 875     /* Mask out low bit of PC to workaround gdb bugs.  This will probably
 876        cause problems if we ever implement the Jazelle DBX extensions.  */
 877     if (n == 15)
 878         tmp &= ~1;
 879
 880     if (n < 16) {
 881         /* Core integer register.  */
 882         env->regs[n] = tmp;
 883         return 4;
 884     }
 885     if (n < 24) { /* 16-23 */
 886         /* FPA registers (ignored).  */
 887         if (gdb_has_xml)
 888             return 0;
 889         return 12;
 890     }
 891     switch (n) {
 892     case 24:
 893         /* FPA status register (ignored).  */
 894         if (gdb_has_xml)
 895             return 0;
 896         return 4;
 897     case 25:
 898         /* CPSR */
 899         cpsr_write (env, tmp, 0xffffffff);
 900         return 4;
 901     }
 902     /* Unknown register.  */
 903     return 0;
 904 }
 905
 906 #elif defined (TARGET_M68K)
 907
 908 #define NUM_CORE_REGS 18
 909
 910 #define GDB_CORE_XML "cf-core.xml"
 911
 912 static int cpu_gdb_read_register(CPUState *env, uint8_t *mem_buf, int n)
 913 {
 914     if (n < 8) {
 915         /* D0-D7 */
 916         GET_REG32(env->dregs[n]);
 917     } else if (n < 16) {
 918         /* A0-A7 */
 919         GET_REG32(env->aregs[n - 8]);
 920     } else {
 921         switch (n) {
 922         case 16: GET_REG32(env->sr);
 923         case 17: GET_REG32(env->pc);
 924         }
 925     }
 926     /* FP registers not included here because they vary between
 927        ColdFire and m68k.  Use XML bits for these.  */
 928     return 0;
 929 }
 930
 931 static int cpu_gdb_write_register(CPUState *env, uint8_t *mem_buf, int n)
 932 {
 933     uint32_t tmp;
 934
 935     tmp = ldl_p(mem_buf);
 936
 937     if (n < 8) {
 938         /* D0-D7 */
 939         env->dregs[n] = tmp;
 940     } else if (n < 8) {
 941         /* A0-A7 */
 942         env->aregs[n - 8] = tmp;
 943     } else {
 944         switch (n) {
 945         case 16: env->sr = tmp; break;
 946         case 17: env->pc = tmp; break;
 947         default: return 0;
 948         }
 949     }
 950     return 4;
 951 }
 952 #elif defined (TARGET_MIPS)
 953
 954 #define NUM_CORE_REGS 73
 955
 956 static int cpu_gdb_read_register(CPUState *env, uint8_t *mem_buf, int n)
 957 {
 958     if (n < 32) {
 959         GET_REGL(env->active_tc.gpr[n]);
 960     }
 961     if (env->CP0_Config1 & (1 << CP0C1_FP)) {
 962         if (n >= 38 && n < 70) {
 963             if (env->CP0_Status & (1 << CP0St_FR))
 964                 GET_REGL(env->active_fpu.fpr[n - 38].d);
 965             else
 966                 GET_REGL(env->active_fpu.fpr[n - 38].w[FP_ENDIAN_IDX]);
 967         }
 968         switch (n) {
 969         case 70: GET_REGL((int32_t)env->active_fpu.fcr31);
 970         case 71: GET_REGL((int32_t)env->active_fpu.fcr0);
 971         }
 972     }
 973     switch (n) {
 974     case 32: GET_REGL((int32_t)env->CP0_Status);
 975     case 33: GET_REGL(env->active_tc.LO[0]);
 976     case 34: GET_REGL(env->active_tc.HI[0]);
 977     case 35: GET_REGL(env->CP0_BadVAddr);
 978     case 36: GET_REGL((int32_t)env->CP0_Cause);
 979     case 37: GET_REGL(env->active_tc.PC);
 980     case 72: GET_REGL(0); /* fp */
 981     case 89: GET_REGL((int32_t)env->CP0_PRid);
 982     }
 983     if (n >= 73 && n <= 88) {
 984         /* 16 embedded regs.  */
 985         GET_REGL(0);
 986     }
 987
 988     return 0;
 989 }
 990
 991 /* convert MIPS rounding mode in FCR31 to IEEE library */
 992 static unsigned int ieee_rm[] =
 993   {
 994     float_round_nearest_even,
 995     float_round_to_zero,
 996     float_round_up,
 997     float_round_down
 998   };
 999 #define RESTORE_ROUNDING_MODE \
1000     set_float_rounding_mode(ieee_rm[env->active_fpu.fcr31 & 3], &env->active_fpu.fp_status)
1001
1002 static int cpu_gdb_write_register(CPUState *env, uint8_t *mem_buf, int n)
1003 {
1004     target_ulong tmp;
1005
1006     tmp = ldtul_p(mem_buf);
1007
1008     if (n < 32) {
1009         env->active_tc.gpr[n] = tmp;
1010         return sizeof(target_ulong);
1011     }
1012     if (env->CP0_Config1 & (1 << CP0C1_FP)
1013             && n >= 38 && n < 73) {
1014         if (n < 70) {
1015             if (env->CP0_Status & (1 << CP0St_FR))
1016               env->active_fpu.fpr[n - 38].d = tmp;
1017             else
1018               env->active_fpu.fpr[n - 38].w[FP_ENDIAN_IDX] = tmp;
1019         }
1020         switch (n) {
1021         case 70:
1022             env->active_fpu.fcr31 = tmp & 0xFF83FFFF;
1023             /* set rounding mode */
1024             RESTORE_ROUNDING_MODE;
1025 #ifndef CONFIG_SOFTFLOAT
1026             /* no floating point exception for native float */
1027             SET_FP_ENABLE(env->active_fpu.fcr31, 0);
1028 #endif
1029             break;
1030         case 71: env->active_fpu.fcr0 = tmp; break;
1031         }
1032         return sizeof(target_ulong);
1033     }
1034     switch (n) {
1035     case 32: env->CP0_Status = tmp; break;
1036     case 33: env->active_tc.LO[0] = tmp; break;
1037     case 34: env->active_tc.HI[0] = tmp; break;
1038     case 35: env->CP0_BadVAddr = tmp; break;
1039     case 36: env->CP0_Cause = tmp; break;
1040     case 37: env->active_tc.PC = tmp; break;
1041     case 72: /* fp, ignored */ break;
1042     default:
1043         if (n > 89)
1044             return 0;
1045         /* Other registers are readonly.  Ignore writes.  */
1046         break;
1047     }
1048
1049     return sizeof(target_ulong);
1050 }
1051 #elif defined (TARGET_SH4)
1052
1053 /* Hint: Use "set architecture sh4" in GDB to see fpu registers */
1054 /* FIXME: We should use XML for this.  */
1055
1056 #define NUM_CORE_REGS 59
1057
1058 static int cpu_gdb_read_register(CPUState *env, uint8_t *mem_buf, int n)
1059 {
1060     if (n < 8) {
1061         if ((env->sr & (SR_MD | SR_RB)) == (SR_MD | SR_RB)) {
1062             GET_REGL(env->gregs[n + 16]);
1063         } else {
1064             GET_REGL(env->gregs[n]);
1065         }
1066     } else if (n < 16) {
1067         GET_REGL(env->gregs[n - 8]);
1068     } else if (n >= 25 && n < 41) {
1069         GET_REGL(env->fregs[(n - 25) + ((env->fpscr & FPSCR_FR) ? 16 : 0)]);
1070     } else if (n >= 43 && n < 51) {
1071         GET_REGL(env->gregs[n - 43]);
1072     } else if (n >= 51 && n < 59) {
1073         GET_REGL(env->gregs[n - (51 - 16)]);
1074     }
1075     switch (n) {
1076     case 16: GET_REGL(env->pc);
1077     case 17: GET_REGL(env->pr);
1078     case 18: GET_REGL(env->gbr);
1079     case 19: GET_REGL(env->vbr);
1080     case 20: GET_REGL(env->mach);
1081     case 21: GET_REGL(env->macl);
1082     case 22: GET_REGL(env->sr);
1083     case 23: GET_REGL(env->fpul);
1084     case 24: GET_REGL(env->fpscr);
1085     case 41: GET_REGL(env->ssr);
1086     case 42: GET_REGL(env->spc);
1087     }
1088
1089     return 0;
1090 }
1091
1092 static int cpu_gdb_write_register(CPUState *env, uint8_t *mem_buf, int n)
1093 {
1094     uint32_t tmp;
1095
1096     tmp = ldl_p(mem_buf);
1097
1098     if (n < 8) {
1099         if ((env->sr & (SR_MD | SR_RB)) == (SR_MD | SR_RB)) {
1100             env->gregs[n + 16] = tmp;
1101         } else {
1102             env->gregs[n] = tmp;
1103         }
1104         return 4;
1105     } else if (n < 16) {
1106         env->gregs[n - 8] = tmp;
1107         return 4;
1108     } else if (n >= 25 && n < 41) {
1109         env->fregs[(n - 25) + ((env->fpscr & FPSCR_FR) ? 16 : 0)] = tmp;
1110     } else if (n >= 43 && n < 51) {
1111         env->gregs[n - 43] = tmp;
1112         return 4;
1113     } else if (n >= 51 && n < 59) {
1114         env->gregs[n - (51 - 16)] = tmp;
1115         return 4;
1116     }
1117     switch (n) {
1118     case 16: env->pc = tmp;
1119     case 17: env->pr = tmp;
1120     case 18: env->gbr = tmp;
1121     case 19: env->vbr = tmp;
1122     case 20: env->mach = tmp;
1123     case 21: env->macl = tmp;
1124     case 22: env->sr = tmp;
1125     case 23: env->fpul = tmp;
1126     case 24: env->fpscr = tmp;
1127     case 41: env->ssr = tmp;
1128     case 42: env->spc = tmp;
1129     default: return 0;
1130     }
1131
1132     return 4;
1133 }
1134 #elif defined (TARGET_CRIS)
1135
1136 #define NUM_CORE_REGS 49
1137
1138 static int cpu_gdb_read_register(CPUState *env, uint8_t *mem_buf, int n)
1139 {
1140     uint8_t srs;
1141
1142     srs = env->pregs[PR_SRS];
1143     if (n < 16) {
1144         GET_REG32(env->regs[n]);
1145     }
1146
1147     if (n >= 21 && n < 32) {
1148         GET_REG32(env->pregs[n - 16]);
1149     }
1150     if (n >= 33 && n < 49) {
1151         GET_REG32(env->sregs[srs][n - 33]);
1152     }
1153     switch (n) {
1154     case 16: GET_REG8(env->pregs[0]);
1155     case 17: GET_REG8(env->pregs[1]);
1156     case 18: GET_REG32(env->pregs[2]);
1157     case 19: GET_REG8(srs);
1158     case 20: GET_REG16(env->pregs[4]);
1159     case 32: GET_REG32(env->pc);
1160     }
1161
1162     return 0;
1163 }
1164
1165 static int cpu_gdb_write_register(CPUState *env, uint8_t *mem_buf, int n)
1166 {
1167     uint32_t tmp;
1168
1169     if (n > 49)
1170         return 0;
1171
1172     tmp = ldl_p(mem_buf);
1173
1174     if (n < 16) {
1175         env->regs[n] = tmp;
1176     }
1177
1178     if (n >= 21 && n < 32) {
1179         env->pregs[n - 16] = tmp;
1180     }
1181
1182     /* FIXME: Should support function regs be writable?  */
1183     switch (n) {
1184     case 16: return 1;
1185     case 17: return 1;
1186     case 18: env->pregs[PR_PID] = tmp; break;
1187     case 19: return 1;
1188     case 20: return 2;
1189     case 32: env->pc = tmp; break;
1190     }
1191
1192     return 4;
1193 }
1194 #elif defined (TARGET_ALPHA)
1195
1196 #define NUM_CORE_REGS 65
1197
1198 static int cpu_gdb_read_register(CPUState *env, uint8_t *mem_buf, int n)
1199 {
1200     if (n < 31) {
1201        GET_REGL(env->ir[n]);
1202     }
1203     else if (n == 31) {
1204        GET_REGL(0);
1205     }
1206     else if (n<63) {
1207        uint64_t val;
1208
1209        val=*((uint64_t *)&env->fir[n-32]);
1210        GET_REGL(val);
1211     }
1212     else if (n==63) {
1213        GET_REGL(env->fpcr);
1214     }
1215     else if (n==64) {
1216        GET_REGL(env->pc);
1217     }
1218     else {
1219        GET_REGL(0);
1220     }
1221
1222     return 0;
1223 }
1224
1225 static int cpu_gdb_write_register(CPUState *env, uint8_t *mem_buf, int n)
1226 {
1227     target_ulong tmp;
1228     tmp = ldtul_p(mem_buf);
1229
1230     if (n < 31) {
1231         env->ir[n] = tmp;
1232     }
1233
1234     if (n > 31 && n < 63) {
1235         env->fir[n - 32] = ldfl_p(mem_buf);
1236     }
1237
1238     if (n == 64 ) {
1239        env->pc=tmp;
1240     }
1241
1242     return 8;
1243 }
1244 #else
1245
1246 #define NUM_CORE_REGS 0
1247
1248 static int cpu_gdb_read_register(CPUState *env, uint8_t *mem_buf, int n)
1249 {
1250     return 0;
1251 }
1252
1253 static int cpu_gdb_write_register(CPUState *env, uint8_t *mem_buf, int n)
1254 {
1255     return 0;
1256 }
1257
1258 #endif
1259
1260 static int num_g_regs = NUM_CORE_REGS;
1261
1262 #ifdef GDB_CORE_XML
1263 /* Encode data using the encoding for 'x' packets.  */
1264 static int memtox(char *buf, const char *mem, int len)
1265 {
1266     char *p = buf;
1267     char c;
1268
1269     while (len--) {
1270         c = *(mem++);
1271         switch (c) {
1272         case '#': case '$': case '*': case '}':
1273             *(p++) = '}';
1274             *(p++) = c ^ 0x20;
1275             break;
1276         default:
1277             *(p++) = c;
1278             break;
1279         }
1280     }
1281     return p - buf;
1282 }
1283
1284 static const char *get_feature_xml(const char *p, const char **newp)
1285 {
1286     extern const char *const xml_builtin[][2];
1287     size_t len;
1288     int i;
1289     const char *name;
1290     static char target_xml[1024];
1291
1292     len = 0;
1293     while (p[len] && p[len] != ':')
1294         len++;
1295     *newp = p + len;
1296
1297     name = NULL;
1298     if (strncmp(p, "target.xml", len) == 0) {
1299         /* Generate the XML description for this CPU.  */
1300         if (!target_xml[0]) {
1301             GDBRegisterState *r;
1302
1303             snprintf(target_xml, sizeof(target_xml),
1304                      "<?xml version=\"1.0\"?>"
1305                      "<!DOCTYPE target SYSTEM \"gdb-target.dtd\">"
1306                      "<target>"
1307                      "<xi:include href=\"%s\"/>",
1308                      GDB_CORE_XML);
1309
1310             for (r = first_cpu->gdb_regs; r; r = r->next) {
1311                 strcat(target_xml, "<xi:include href=\"");
1312                 strcat(target_xml, r->xml);
1313                 strcat(target_xml, "\"/>");
1314             }
1315             strcat(target_xml, "</target>");
1316         }
1317         return target_xml;
1318     }
1319     for (i = 0; ; i++) {
1320         name = xml_builtin[i][0];
1321         if (!name || (strncmp(name, p, len) == 0 && strlen(name) == len))
1322             break;
1323     }
1324     return name ? xml_builtin[i][1] : NULL;
1325 }
1326 #endif
1327
1328 static int gdb_read_register(CPUState *env, uint8_t *mem_buf, int reg)
1329 {
1330     GDBRegisterState *r;
1331
1332     if (reg < NUM_CORE_REGS)
1333         return cpu_gdb_read_register(env, mem_buf, reg);
1334
1335     for (r = env->gdb_regs; r; r = r->next) {
1336         if (r->base_reg <= reg && reg < r->base_reg + r->num_regs) {
1337             return r->get_reg(env, mem_buf, reg - r->base_reg);
1338         }
1339     }
1340     return 0;
1341 }
1342
1343 static int gdb_write_register(CPUState *env, uint8_t *mem_buf, int reg)
1344 {
1345     GDBRegisterState *r;
1346
1347     if (reg < NUM_CORE_REGS)
1348         return cpu_gdb_write_register(env, mem_buf, reg);
1349
1350     for (r = env->gdb_regs; r; r = r->next) {
1351         if (r->base_reg <= reg && reg < r->base_reg + r->num_regs) {
1352             return r->set_reg(env, mem_buf, reg - r->base_reg);
1353         }
1354     }
1355     return 0;
1356 }
1357
1358 /* Register a supplemental set of CPU registers.  If g_pos is nonzero it
1359    specifies the first register number and these registers are included in
1360    a standard "g" packet.  Direction is relative to gdb, i.e. get_reg is
1361    gdb reading a CPU register, and set_reg is gdb modifying a CPU register.
1362  */
1363
1364 void gdb_register_coprocessor(CPUState * env,
1365                              gdb_reg_cb get_reg, gdb_reg_cb set_reg,
1366                              int num_regs, const char *xml, int g_pos)
1367 {
1368     GDBRegisterState *s;
1369     GDBRegisterState **p;
1370     static int last_reg = NUM_CORE_REGS;
1371
1372     s = (GDBRegisterState *)qemu_mallocz(sizeof(GDBRegisterState));
1373     s->base_reg = last_reg;
1374     s->num_regs = num_regs;
1375     s->get_reg = get_reg;
1376     s->set_reg = set_reg;
1377     s->xml = xml;
1378     p = &env->gdb_regs;
1379     while (*p) {
1380         /* Check for duplicates.  */
1381         if (strcmp((*p)->xml, xml) == 0)
1382             return;
1383         p = &(*p)->next;
1384     }
1385     /* Add to end of list.  */
1386     last_reg += num_regs;
1387     *p = s;
1388     if (g_pos) {
1389         if (g_pos != s->base_reg) {
1390             fprintf(stderr, "Error: Bad gdb register numbering for '%s'\n"
1391                     "Expected %d got %d\n", xml, g_pos, s->base_reg);
1392         } else {
1393             num_g_regs = last_reg;
1394         }
1395     }
1396 }
1397
1398 /* GDB breakpoint/watchpoint types */
1399 #define GDB_BREAKPOINT_SW        0
1400 #define GDB_BREAKPOINT_HW        1
1401 #define GDB_WATCHPOINT_WRITE     2
1402 #define GDB_WATCHPOINT_READ      3
1403 #define GDB_WATCHPOINT_ACCESS    4
1404
1405 #ifndef CONFIG_USER_ONLY
1406 static const int xlat_gdb_type[] = {
1407     [GDB_WATCHPOINT_WRITE]  = BP_GDB | BP_MEM_WRITE,
1408     [GDB_WATCHPOINT_READ]   = BP_GDB | BP_MEM_READ,
1409     [GDB_WATCHPOINT_ACCESS] = BP_GDB | BP_MEM_ACCESS,
1410 };
1411 #endif
1412
1413 static int gdb_breakpoint_insert(target_ulong addr, target_ulong len, int type)
1414 {
1415     CPUState *env;
1416     int err = 0;
1417
1418     switch (type) {
1419     case GDB_BREAKPOINT_SW:
1420     case GDB_BREAKPOINT_HW:
1421         for (env = first_cpu; env != NULL; env = env->next_cpu) {
1422             err = cpu_breakpoint_insert(env, addr, BP_GDB, NULL);
1423             if (err)
1424                 break;
1425         }
1426         return err;
1427 #ifndef CONFIG_USER_ONLY
1428     case GDB_WATCHPOINT_WRITE:
1429     case GDB_WATCHPOINT_READ:
1430     case GDB_WATCHPOINT_ACCESS:
1431         for (env = first_cpu; env != NULL; env = env->next_cpu) {
1432             err = cpu_watchpoint_insert(env, addr, len, xlat_gdb_type[type],
1433                                         NULL);
1434             if (err)
1435                 break;
1436         }
1437         return err;
1438 #endif
1439     default:
1440         return -ENOSYS;
1441     }
1442 }
1443
1444 static int gdb_breakpoint_remove(target_ulong addr, target_ulong len, int type)
1445 {
1446     CPUState *env;
1447     int err = 0;
1448
1449     switch (type) {
1450     case GDB_BREAKPOINT_SW:
1451     case GDB_BREAKPOINT_HW:
1452         for (env = first_cpu; env != NULL; env = env->next_cpu) {
1453             err = cpu_breakpoint_remove(env, addr, BP_GDB);
1454             if (err)
1455                 break;
1456         }
1457         return err;
1458 #ifndef CONFIG_USER_ONLY
1459     case GDB_WATCHPOINT_WRITE:
1460     case GDB_WATCHPOINT_READ:
1461     case GDB_WATCHPOINT_ACCESS:
1462         for (env = first_cpu; env != NULL; env = env->next_cpu) {
1463             err = cpu_watchpoint_remove(env, addr, len, xlat_gdb_type[type]);
1464             if (err)
1465                 break;
1466         }
1467         return err;
1468 #endif
1469     default:
1470         return -ENOSYS;
1471     }
1472 }
1473
1474 static void gdb_breakpoint_remove_all(void)
1475 {
1476     CPUState *env;
1477
1478     for (env = first_cpu; env != NULL; env = env->next_cpu) {
1479         cpu_breakpoint_remove_all(env, BP_GDB);
1480 #ifndef CONFIG_USER_ONLY
1481         cpu_watchpoint_remove_all(env, BP_GDB);
1482 #endif
1483     }
1484 }
1485
1486 static int gdb_handle_packet(GDBState *s, const char *line_buf)
1487 {
1488     CPUState *env;
1489     const char *p;
1490     int ch, reg_size, type, res, thread;
1491     char buf[MAX_PACKET_LENGTH];
1492     uint8_t mem_buf[MAX_PACKET_LENGTH];
1493     uint8_t *registers;
1494     target_ulong addr, len;
1495
1496 #ifdef DEBUG_GDB
1497     printf("command='%s'\n", line_buf);
1498 #endif
1499     p = line_buf;
1500     ch = *p++;
1501     switch(ch) {
1502     case '?':
1503         /* TODO: Make this return the correct value for user-mode.  */
1504         snprintf(buf, sizeof(buf), "T%02xthread:%02x;", GDB_SIGNAL_TRAP,
1505                  s->c_cpu->cpu_index+1);
1506         put_packet(s, buf);
1507         /* Remove all the breakpoints when this query is issued,
1508          * because gdb is doing and initial connect and the state
1509          * should be cleaned up.
1510          */
1511         gdb_breakpoint_remove_all();
1512         break;
1513     case 'c':
1514         if (*p != '\0') {
1515             addr = strtoull(p, (char **)&p, 16);
1516 #if defined(TARGET_I386)
1517             s->c_cpu->eip = addr;
1518 #elif defined (TARGET_PPC)
1519             s->c_cpu->nip = addr;
1520 #elif defined (TARGET_SPARC)
1521             s->c_cpu->pc = addr;
1522             s->c_cpu->npc = addr + 4;
1523 #elif defined (TARGET_ARM)
1524             s->c_cpu->regs[15] = addr;
1525 #elif defined (TARGET_SH4)
1526             s->c_cpu->pc = addr;
1527 #elif defined (TARGET_MIPS)
1528             s->c_cpu->active_tc.PC = addr;
1529 #elif defined (TARGET_CRIS)
1530             s->c_cpu->pc = addr;
1531 #elif defined (TARGET_ALPHA)
1532             s->c_cpu->pc = addr;
1533 #endif
1534         }
1535         s->signal = 0;
1536         gdb_continue(s);
1537         return RS_IDLE;
1538     case 'C':
1539         s->signal = gdb_signal_to_target (strtoul(p, (char **)&p, 16));
1540         if (s->signal == -1)
1541             s->signal = 0;
1542         gdb_continue(s);
1543         return RS_IDLE;
1544     case 'k':
1545         /* Kill the target */
1546         fprintf(stderr, "\nQEMU: Terminated via GDBstub\n");
1547         exit(0);
1548     case 'D':
1549         /* Detach packet */
1550         gdb_breakpoint_remove_all();
1551         gdb_continue(s);
1552         put_packet(s, "OK");
1553         break;
1554     case 's':
1555         if (*p != '\0') {
1556             addr = strtoull(p, (char **)&p, 16);
1557 #if defined(TARGET_I386)
1558             s->c_cpu->eip = addr;
1559 #elif defined (TARGET_PPC)
1560             s->c_cpu->nip = addr;
1561 #elif defined (TARGET_SPARC)
1562             s->c_cpu->pc = addr;
1563             s->c_cpu->npc = addr + 4;
1564 #elif defined (TARGET_ARM)
1565             s->c_cpu->regs[15] = addr;
1566 #elif defined (TARGET_SH4)
1567             s->c_cpu->pc = addr;
1568 #elif defined (TARGET_MIPS)
1569             s->c_cpu->active_tc.PC = addr;
1570 #elif defined (TARGET_CRIS)
1571             s->c_cpu->pc = addr;
1572 #elif defined (TARGET_ALPHA)
1573             s->c_cpu->pc = addr;
1574 #endif
1575         }
1576         cpu_single_step(s->c_cpu, sstep_flags);
1577         gdb_continue(s);
1578         return RS_IDLE;
1579     case 'F':
1580         {
1581             target_ulong ret;
1582             target_ulong err;
1583
1584             ret = strtoull(p, (char **)&p, 16);
1585             if (*p == ',') {
1586                 p++;
1587                 err = strtoull(p, (char **)&p, 16);
1588             } else {
1589                 err = 0;
1590             }
1591             if (*p == ',')
1592                 p++;
1593             type = *p;
1594             if (gdb_current_syscall_cb)
1595                 gdb_current_syscall_cb(s->c_cpu, ret, err);
1596             if (type == 'C') {
1597                 put_packet(s, "T02");
1598             } else {
1599                 gdb_continue(s);
1600             }
1601         }
1602         break;
1603     case 'g':
1604         len = 0;
1605         for (addr = 0; addr < num_g_regs; addr++) {
1606             reg_size = gdb_read_register(s->g_cpu, mem_buf + len, addr);
1607             len += reg_size;
1608         }
1609         memtohex(buf, mem_buf, len);
1610         put_packet(s, buf);
1611         break;
1612     case 'G':
1613         registers = mem_buf;
1614         len = strlen(p) / 2;
1615         hextomem((uint8_t *)registers, p, len);
1616         for (addr = 0; addr < num_g_regs && len > 0; addr++) {
1617             reg_size = gdb_write_register(s->g_cpu, registers, addr);
1618             len -= reg_size;
1619             registers += reg_size;
1620         }
1621         put_packet(s, "OK");
1622         break;
1623     case 'm':
1624         addr = strtoull(p, (char **)&p, 16);
1625         if (*p == ',')
1626             p++;
1627         len = strtoull(p, NULL, 16);
1628         if (cpu_memory_rw_debug(s->g_cpu, addr, mem_buf, len, 0) != 0) {
1629             put_packet (s, "E14");
1630         } else {
1631             memtohex(buf, mem_buf, len);
1632             put_packet(s, buf);
1633         }
1634         break;
1635     case 'M':
1636         addr = strtoull(p, (char **)&p, 16);
1637         if (*p == ',')
1638             p++;
1639         len = strtoull(p, (char **)&p, 16);
1640         if (*p == ':')
1641             p++;
1642         hextomem(mem_buf, p, len);
1643         if (cpu_memory_rw_debug(s->g_cpu, addr, mem_buf, len, 1) != 0)
1644             put_packet(s, "E14");
1645         else
1646             put_packet(s, "OK");
1647         break;
1648     case 'p':
1649         /* Older gdb are really dumb, and don't use 'g' if 'p' is avaialable.
1650            This works, but can be very slow.  Anything new enough to
1651            understand XML also knows how to use this properly.  */
1652         if (!gdb_has_xml)
1653             goto unknown_command;
1654         addr = strtoull(p, (char **)&p, 16);
1655         reg_size = gdb_read_register(s->g_cpu, mem_buf, addr);
1656         if (reg_size) {
1657             memtohex(buf, mem_buf, reg_size);
1658             put_packet(s, buf);
1659         } else {
1660             put_packet(s, "E14");
1661         }
1662         break;
1663     case 'P':
1664         if (!gdb_has_xml)
1665             goto unknown_command;
1666         addr = strtoull(p, (char **)&p, 16);
1667         if (*p == '=')
1668             p++;
1669         reg_size = strlen(p) / 2;
1670         hextomem(mem_buf, p, reg_size);
1671         gdb_write_register(s->g_cpu, mem_buf, addr);
1672         put_packet(s, "OK");
1673         break;
1674     case 'Z':
1675     case 'z':
1676         type = strtoul(p, (char **)&p, 16);
1677         if (*p == ',')
1678             p++;
1679         addr = strtoull(p, (char **)&p, 16);
1680         if (*p == ',')
1681             p++;
1682         len = strtoull(p, (char **)&p, 16);
1683         if (ch == 'Z')
1684             res = gdb_breakpoint_insert(addr, len, type);
1685         else
1686             res = gdb_breakpoint_remove(addr, len, type);
1687         if (res >= 0)
1688              put_packet(s, "OK");
1689         else if (res == -ENOSYS)
1690             put_packet(s, "");
1691         else
1692             put_packet(s, "E22");
1693         break;
1694     case 'H':
1695         type = *p++;
1696         thread = strtoull(p, (char **)&p, 16);
1697         if (thread == -1 || thread == 0) {
1698             put_packet(s, "OK");
1699             break;
1700         }
1701         for (env = first_cpu; env != NULL; env = env->next_cpu)
1702             if (env->cpu_index + 1 == thread)
1703                 break;
1704         if (env == NULL) {
1705             put_packet(s, "E22");
1706             break;
1707         }
1708         switch (type) {
1709         case 'c':
1710             s->c_cpu = env;
1711             put_packet(s, "OK");
1712             break;
1713         case 'g':
1714             s->g_cpu = env;
1715             put_packet(s, "OK");
1716             break;
1717         default:
1718              put_packet(s, "E22");
1719              break;
1720         }
1721         break;
1722     case 'T':
1723         thread = strtoull(p, (char **)&p, 16);
1724 #ifndef CONFIG_USER_ONLY
1725         if (thread > 0 && thread < smp_cpus + 1)
1726 #else
1727         if (thread == 1)
1728 #endif
1729              put_packet(s, "OK");
1730         else
1731             put_packet(s, "E22");
1732         break;
1733     case 'q':
1734     case 'Q':
1735         /* parse any 'q' packets here */
1736         if (!strcmp(p,"qemu.sstepbits")) {
1737             /* Query Breakpoint bit definitions */
1738             snprintf(buf, sizeof(buf), "ENABLE=%x,NOIRQ=%x,NOTIMER=%x",
1739                      SSTEP_ENABLE,
1740                      SSTEP_NOIRQ,
1741                      SSTEP_NOTIMER);
1742             put_packet(s, buf);
1743             break;
1744         } else if (strncmp(p,"qemu.sstep",10) == 0) {
1745             /* Display or change the sstep_flags */
1746             p += 10;
1747             if (*p != '=') {
1748                 /* Display current setting */
1749                 snprintf(buf, sizeof(buf), "0x%x", sstep_flags);
1750                 put_packet(s, buf);
1751                 break;
1752             }
1753             p++;
1754             type = strtoul(p, (char **)&p, 16);
1755             sstep_flags = type;
1756             put_packet(s, "OK");
1757             break;
1758         } else if (strcmp(p,"C") == 0) {
1759             /* "Current thread" remains vague in the spec, so always return
1760              *  the first CPU (gdb returns the first thread). */
1761             put_packet(s, "QC1");
1762             break;
1763         } else if (strcmp(p,"fThreadInfo") == 0) {
1764             s->query_cpu = first_cpu;
1765             goto report_cpuinfo;
1766         } else if (strcmp(p,"sThreadInfo") == 0) {
1767         report_cpuinfo:
1768             if (s->query_cpu) {
1769                 snprintf(buf, sizeof(buf), "m%x", s->query_cpu->cpu_index+1);
1770                 put_packet(s, buf);
1771                 s->query_cpu = s->query_cpu->next_cpu;
1772             } else
1773                 put_packet(s, "l");
1774             break;
1775         } else if (strncmp(p,"ThreadExtraInfo,", 16) == 0) {
1776             thread = strtoull(p+16, (char **)&p, 16);
1777             for (env = first_cpu; env != NULL; env = env->next_cpu)
1778                 if (env->cpu_index + 1 == thread) {
1779                     len = snprintf((char *)mem_buf, sizeof(mem_buf),
1780                                    "CPU#%d [%s]", env->cpu_index,
1781                                    env->halted ? "halted " : "running");
1782                     memtohex(buf, mem_buf, len);
1783                     put_packet(s, buf);
1784                     break;
1785                 }
1786             break;
1787         }
1788 #ifdef CONFIG_LINUX_USER
1789         else if (strncmp(p, "Offsets", 7) == 0) {
1790             TaskState *ts = s->c_cpu->opaque;
1791
1792             snprintf(buf, sizeof(buf),
1793                      "Text=" TARGET_ABI_FMT_lx ";Data=" TARGET_ABI_FMT_lx
1794                      ";Bss=" TARGET_ABI_FMT_lx,
1795                      ts->info->code_offset,
1796                      ts->info->data_offset,
1797                      ts->info->data_offset);
1798             put_packet(s, buf);
1799             break;
1800         }
1801 #endif
1802         if (strncmp(p, "Supported", 9) == 0) {
1803             snprintf(buf, sizeof(buf), "PacketSize=%x", MAX_PACKET_LENGTH);
1804 #ifdef GDB_CORE_XML
1805             strcat(buf, ";qXfer:features:read+");
1806 #endif
1807             put_packet(s, buf);
1808             break;
1809         }
1810 #ifdef GDB_CORE_XML
1811         if (strncmp(p, "Xfer:features:read:", 19) == 0) {
1812             const char *xml;
1813             target_ulong total_len;
1814
1815             gdb_has_xml = 1;
1816             p += 19;
1817             xml = get_feature_xml(p, &p);
1818             if (!xml) {
1819                 snprintf(buf, sizeof(buf), "E00");
1820                 put_packet(s, buf);
1821                 break;
1822             }
1823
1824             if (*p == ':')
1825                 p++;
1826             addr = strtoul(p, (char **)&p, 16);
1827             if (*p == ',')
1828                 p++;
1829             len = strtoul(p, (char **)&p, 16);
1830
1831             total_len = strlen(xml);
1832             if (addr > total_len) {
1833                 snprintf(buf, sizeof(buf), "E00");
1834                 put_packet(s, buf);
1835                 break;
1836             }
1837             if (len > (MAX_PACKET_LENGTH - 5) / 2)
1838                 len = (MAX_PACKET_LENGTH - 5) / 2;
1839             if (len < total_len - addr) {
1840                 buf[0] = 'm';
1841                 len = memtox(buf + 1, xml + addr, len);
1842             } else {
1843                 buf[0] = 'l';
1844                 len = memtox(buf + 1, xml + addr, total_len - addr);
1845             }
1846             put_packet_binary(s, buf, len + 1);
1847             break;
1848         }
1849 #endif
1850         /* Unrecognised 'q' command.  */
1851         goto unknown_command;
1852
1853     default:
1854     unknown_command:
1855         /* put empty packet */
1856         buf[0] = '\0';
1857         put_packet(s, buf);
1858         break;
1859     }
1860     return RS_IDLE;
1861 }
1862
1863 void gdb_set_stop_cpu(CPUState *env)
1864 {
1865     gdbserver_state->c_cpu = env;
1866     gdbserver_state->g_cpu = env;
1867 }
1868
1869 #ifndef CONFIG_USER_ONLY
1870 static void gdb_vm_stopped(void *opaque, int reason)
1871 {
1872     GDBState *s = gdbserver_state;
1873     CPUState *env = s->c_cpu;
1874     char buf[256];
1875     const char *type;
1876     int ret;
1877
1878     if (s->state == RS_SYSCALL)
1879         return;
1880
1881     /* disable single step if it was enable */
1882     cpu_single_step(env, 0);
1883
1884     if (reason == EXCP_DEBUG) {
1885         if (env->watchpoint_hit) {
1886             switch (env->watchpoint_hit->flags & BP_MEM_ACCESS) {
1887             case BP_MEM_READ:
1888                 type = "r";
1889                 break;
1890             case BP_MEM_ACCESS:
1891                 type = "a";
1892                 break;
1893             default:
1894                 type = "";
1895                 break;
1896             }
1897             snprintf(buf, sizeof(buf),
1898                      "T%02xthread:%02x;%swatch:" TARGET_FMT_lx ";",
1899                      GDB_SIGNAL_TRAP, env->cpu_index+1, type,
1900                      env->watchpoint_hit->vaddr);
1901             put_packet(s, buf);
1902             env->watchpoint_hit = NULL;
1903             return;
1904         }
1905         tb_flush(env);
1906         ret = GDB_SIGNAL_TRAP;
1907     } else if (reason == EXCP_INTERRUPT) {
1908         ret = GDB_SIGNAL_INT;
1909     } else {
1910         ret = 0;
1911     }
1912     snprintf(buf, sizeof(buf), "T%02xthread:%02x;", ret, env->cpu_index+1);
1913     put_packet(s, buf);
1914 }
1915 #endif
1916
1917 /* Send a gdb syscall request.
1918    This accepts limited printf-style format specifiers, specifically:
1919     %x  - target_ulong argument printed in hex.
1920     %lx - 64-bit argument printed in hex.
1921     %s  - string pointer (target_ulong) and length (int) pair.  */
1922 void gdb_do_syscall(gdb_syscall_complete_cb cb, const char *fmt, ...)
1923 {
1924     va_list va;
1925     char buf[256];
1926     char *p;
1927     target_ulong addr;
1928     uint64_t i64;
1929     GDBState *s;
1930
1931     s = gdbserver_state;
1932     if (!s)
1933         return;
1934     gdb_current_syscall_cb = cb;
1935     s->state = RS_SYSCALL;
1936 #ifndef CONFIG_USER_ONLY
1937     vm_stop(EXCP_DEBUG);
1938 #endif
1939     s->state = RS_IDLE;
1940     va_start(va, fmt);
1941     p = buf;
1942     *(p++) = 'F';
1943     while (*fmt) {
1944         if (*fmt == '%') {
1945             fmt++;
1946             switch (*fmt++) {
1947             case 'x':
1948                 addr = va_arg(va, target_ulong);
1949                 p += snprintf(p, &buf[sizeof(buf)] - p, TARGET_FMT_lx, addr);
1950                 break;
1951             case 'l':
1952                 if (*(fmt++) != 'x')
1953                     goto bad_format;
1954                 i64 = va_arg(va, uint64_t);
1955                 p += snprintf(p, &buf[sizeof(buf)] - p, "%" PRIx64, i64);
1956                 break;
1957             case 's':
1958                 addr = va_arg(va, target_ulong);
1959                 p += snprintf(p, &buf[sizeof(buf)] - p, TARGET_FMT_lx "/%x",
1960                               addr, va_arg(va, int));
1961                 break;
1962             default:
1963             bad_format:
1964                 fprintf(stderr, "gdbstub: Bad syscall format string '%s'\n",
1965                         fmt - 1);
1966                 break;
1967             }
1968         } else {
1969             *(p++) = *(fmt++);
1970         }
1971     }
1972     *p = 0;
1973     va_end(va);
1974     put_packet(s, buf);
1975 #ifdef CONFIG_USER_ONLY
1976     gdb_handlesig(s->c_cpu, 0);
1977 #else
1978     cpu_interrupt(s->c_cpu, CPU_INTERRUPT_EXIT);
1979 #endif
1980 }
1981
1982 static void gdb_read_byte(GDBState *s, int ch)
1983 {
1984     int i, csum;
1985     uint8_t reply;
1986
1987 #ifndef CONFIG_USER_ONLY
1988     if (s->last_packet_len) {
1989         /* Waiting for a response to the last packet.  If we see the start
1990            of a new command then abandon the previous response.  */
1991         if (ch == '-') {
1992 #ifdef DEBUG_GDB
1993             printf("Got NACK, retransmitting\n");
1994 #endif
1995             put_buffer(s, (uint8_t *)s->last_packet, s->last_packet_len);
1996         }
1997 #ifdef DEBUG_GDB
1998         else if (ch == '+')
1999             printf("Got ACK\n");
2000         else
2001             printf("Got '%c' when expecting ACK/NACK\n", ch);
2002 #endif
2003         if (ch == '+' || ch == '$')
2004             s->last_packet_len = 0;
2005         if (ch != '$')
2006             return;
2007     }
2008     if (vm_running) {
2009         /* when the CPU is running, we cannot do anything except stop
2010            it when receiving a char */
2011         vm_stop(EXCP_INTERRUPT);
2012     } else
2013 #endif
2014     {
2015         switch(s->state) {
2016         case RS_IDLE:
2017             if (ch == '$') {
2018                 s->line_buf_index = 0;
2019                 s->state = RS_GETLINE;
2020             }
2021             break;
2022         case RS_GETLINE:
2023             if (ch == '#') {
2024             s->state = RS_CHKSUM1;
2025             } else if (s->line_buf_index >= sizeof(s->line_buf) - 1) {
2026                 s->state = RS_IDLE;
2027             } else {
2028             s->line_buf[s->line_buf_index++] = ch;
2029             }
2030             break;
2031         case RS_CHKSUM1:
2032             s->line_buf[s->line_buf_index] = '\0';
2033             s->line_csum = fromhex(ch) << 4;
2034             s->state = RS_CHKSUM2;
2035             break;
2036         case RS_CHKSUM2:
2037             s->line_csum |= fromhex(ch);
2038             csum = 0;
2039             for(i = 0; i < s->line_buf_index; i++) {
2040                 csum += s->line_buf[i];
2041             }
2042             if (s->line_csum != (csum & 0xff)) {
2043                 reply = '-';
2044                 put_buffer(s, &reply, 1);
2045                 s->state = RS_IDLE;
2046             } else {
2047                 reply = '+';
2048                 put_buffer(s, &reply, 1);
2049                 s->state = gdb_handle_packet(s, s->line_buf);
2050             }
2051             break;
2052         default:
2053             abort();
2054         }
2055     }
2056 }
2057
2058 #ifdef CONFIG_USER_ONLY
2059 int
2060 gdb_queuesig (void)
2061 {
2062     GDBState *s;
2063
2064     s = gdbserver_state;
2065
2066     if (gdbserver_fd < 0 || s->fd < 0)
2067         return 0;
2068     else
2069         return 1;
2070 }
2071
2072 int
2073 gdb_handlesig (CPUState *env, int sig)
2074 {
2075   GDBState *s;
2076   char buf[256];
2077   int n;
2078
2079   s = gdbserver_state;
2080   if (gdbserver_fd < 0 || s->fd < 0)
2081     return sig;
2082
2083   /* disable single step if it was enabled */
2084   cpu_single_step(env, 0);
2085   tb_flush(env);
2086
2087   if (sig != 0)
2088     {
2089       snprintf(buf, sizeof(buf), "S%02x", target_signal_to_gdb (sig));
2090       put_packet(s, buf);
2091     }
2092   /* put_packet() might have detected that the peer terminated the
2093      connection.  */
2094   if (s->fd < 0)
2095       return sig;
2096
2097   sig = 0;
2098   s->state = RS_IDLE;
2099   s->running_state = 0;
2100   while (s->running_state == 0) {
2101       n = read (s->fd, buf, 256);
2102       if (n > 0)
2103         {
2104           int i;
2105
2106           for (i = 0; i < n; i++)
2107             gdb_read_byte (s, buf[i]);
2108         }
2109       else if (n == 0 || errno != EAGAIN)
2110         {
2111           /* XXX: Connection closed.  Should probably wait for annother
2112              connection before continuing.  */
2113           return sig;
2114         }
2115   }
2116   sig = s->signal;
2117   s->signal = 0;
2118   return sig;
2119 }
2120
2121 /* Tell the remote gdb that the process has exited.  */
2122 void gdb_exit(CPUState *env, int code)
2123 {
2124   GDBState *s;
2125   char buf[4];
2126
2127   s = gdbserver_state;
2128   if (gdbserver_fd < 0 || s->fd < 0)
2129     return;
2130
2131   snprintf(buf, sizeof(buf), "W%02x", code);
2132   put_packet(s, buf);
2133 }
2134
2135 /* Tell the remote gdb that the process has exited due to SIG.  */
2136 void gdb_signalled(CPUState *env, int sig)
2137 {
2138   GDBState *s;
2139   char buf[4];
2140
2141   s = gdbserver_state;
2142   if (gdbserver_fd < 0 || s->fd < 0)
2143     return;
2144
2145   snprintf(buf, sizeof(buf), "X%02x", target_signal_to_gdb (sig));
2146   put_packet(s, buf);
2147 }
2148
2149 static void gdb_accept(void)
2150 {
2151     GDBState *s;
2152     struct sockaddr_in sockaddr;
2153     socklen_t len;
2154     int val, fd;
2155
2156     for(;;) {
2157         len = sizeof(sockaddr);
2158         fd = accept(gdbserver_fd, (struct sockaddr *)&sockaddr, &len);
2159         if (fd < 0 && errno != EINTR) {
2160             perror("accept");
2161             return;
2162         } else if (fd >= 0) {
2163             break;
2164         }
2165     }
2166
2167     /* set short latency */
2168     val = 1;
2169     setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *)&val, sizeof(val));
2170
2171     s = qemu_mallocz(sizeof(GDBState));
2172     if (!s) {
2173         errno = ENOMEM;
2174         perror("accept");
2175         return;
2176     }
2177
2178     memset (s, 0, sizeof (GDBState));
2179     s->c_cpu = first_cpu;
2180     s->g_cpu = first_cpu;
2181     s->fd = fd;
2182     gdb_has_xml = 0;
2183
2184     gdbserver_state = s;
2185
2186     fcntl(fd, F_SETFL, O_NONBLOCK);
2187 }
2188
2189 static int gdbserver_open(int port)
2190 {
2191     struct sockaddr_in sockaddr;
2192     int fd, val, ret;
2193
2194     fd = socket(PF_INET, SOCK_STREAM, 0);
2195     if (fd < 0) {
2196         perror("socket");
2197         return -1;
2198     }
2199
2200     /* allow fast reuse */
2201     val = 1;
2202     setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&val, sizeof(val));
2203
2204     sockaddr.sin_family = AF_INET;
2205     sockaddr.sin_port = htons(port);
2206     sockaddr.sin_addr.s_addr = 0;
2207     ret = bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr));
2208     if (ret < 0) {
2209         perror("bind");
2210         return -1;
2211     }
2212     ret = listen(fd, 0);
2213     if (ret < 0) {
2214         perror("listen");
2215         return -1;
2216     }
2217     return fd;
2218 }
2219
2220 int gdbserver_start(int port)
2221 {
2222     gdbserver_fd = gdbserver_open(port);
2223     if (gdbserver_fd < 0)
2224         return -1;
2225     /* accept connections */
2226     gdb_accept();
2227     return 0;
2228 }
2229
2230 /* Disable gdb stub for child processes.  */
2231 void gdbserver_fork(CPUState *env)
2232 {
2233     GDBState *s = gdbserver_state;
2234     if (gdbserver_fd < 0 || s->fd < 0)
2235       return;
2236     close(s->fd);
2237     s->fd = -1;
2238     cpu_breakpoint_remove_all(env, BP_GDB);
2239     cpu_watchpoint_remove_all(env, BP_GDB);
2240 }
2241 #else
2242 static int gdb_chr_can_receive(void *opaque)
2243 {
2244   /* We can handle an arbitrarily large amount of data.
2245    Pick the maximum packet size, which is as good as anything.  */
2246   return MAX_PACKET_LENGTH;
2247 }
2248
2249 static void gdb_chr_receive(void *opaque, const uint8_t *buf, int size)
2250 {
2251     int i;
2252
2253     for (i = 0; i < size; i++) {
2254         gdb_read_byte(gdbserver_state, buf[i]);
2255     }
2256 }
2257
2258 static void gdb_chr_event(void *opaque, int event)
2259 {
2260     switch (event) {
2261     case CHR_EVENT_RESET:
2262         vm_stop(EXCP_INTERRUPT);
2263         gdb_has_xml = 0;
2264         break;
2265     default:
2266         break;
2267     }
2268 }
2269
2270 int gdbserver_start(const char *port)
2271 {
2272     GDBState *s;
2273     char gdbstub_port_name[128];
2274     int port_num;
2275     char *p;
2276     CharDriverState *chr;
2277
2278     if (!port || !*port)
2279       return -1;
2280
2281     port_num = strtol(port, &p, 10);
2282     if (*p == 0) {
2283         /* A numeric value is interpreted as a port number.  */
2284         snprintf(gdbstub_port_name, sizeof(gdbstub_port_name),
2285                  "tcp::%d,nowait,nodelay,server", port_num);
2286         port = gdbstub_port_name;
2287     }
2288
2289     chr = qemu_chr_open("gdb", port, NULL);
2290     if (!chr)
2291         return -1;
2292
2293     s = qemu_mallocz(sizeof(GDBState));
2294     if (!s) {
2295         return -1;
2296     }
2297     s->c_cpu = first_cpu;
2298     s->g_cpu = first_cpu;
2299     s->chr = chr;
2300     gdbserver_state = s;
2301     qemu_chr_add_handlers(chr, gdb_chr_can_receive, gdb_chr_receive,
2302                           gdb_chr_event, NULL);
2303     qemu_add_vm_stop_handler(gdb_vm_stopped, NULL);
2304     return 0;
2305 }
2306 #endif