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, see <http://www.gnu.org/licenses/>.
  18  */
  19 #include "config.h"
  20 #include "qemu-common.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 "monitor.h"
  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 "cpu.h"
  41 #include "qemu_socket.h"
  42 #include "kvm.h"
  43
  44
  45 enum {
  46     GDB_SIGNAL_0 = 0,
  47     GDB_SIGNAL_INT = 2,
  48     GDB_SIGNAL_QUIT = 3,
  49     GDB_SIGNAL_TRAP = 5,
  50     GDB_SIGNAL_ABRT = 6,
  51     GDB_SIGNAL_ALRM = 14,
  52     GDB_SIGNAL_IO = 23,
  53     GDB_SIGNAL_XCPU = 24,
  54     GDB_SIGNAL_UNKNOWN = 143
  55 };
  56
  57 #ifdef CONFIG_USER_ONLY
  58
  59 /* Map target signal numbers to GDB protocol signal numbers and vice
  60  * versa.  For user emulation's currently supported systems, we can
  61  * assume most signals are defined.
  62  */
  63
  64 static int gdb_signal_table[] = {
  65     0,
  66     TARGET_SIGHUP,
  67     TARGET_SIGINT,
  68     TARGET_SIGQUIT,
  69     TARGET_SIGILL,
  70     TARGET_SIGTRAP,
  71     TARGET_SIGABRT,
  72     -1, /* SIGEMT */
  73     TARGET_SIGFPE,
  74     TARGET_SIGKILL,
  75     TARGET_SIGBUS,
  76     TARGET_SIGSEGV,
  77     TARGET_SIGSYS,
  78     TARGET_SIGPIPE,
  79     TARGET_SIGALRM,
  80     TARGET_SIGTERM,
  81     TARGET_SIGURG,
  82     TARGET_SIGSTOP,
  83     TARGET_SIGTSTP,
  84     TARGET_SIGCONT,
  85     TARGET_SIGCHLD,
  86     TARGET_SIGTTIN,
  87     TARGET_SIGTTOU,
  88     TARGET_SIGIO,
  89     TARGET_SIGXCPU,
  90     TARGET_SIGXFSZ,
  91     TARGET_SIGVTALRM,
  92     TARGET_SIGPROF,
  93     TARGET_SIGWINCH,
  94     -1, /* SIGLOST */
  95     TARGET_SIGUSR1,
  96     TARGET_SIGUSR2,
  97 #ifdef TARGET_SIGPWR
  98     TARGET_SIGPWR,
  99 #else
 100     -1,
 101 #endif
 102     -1, /* SIGPOLL */
 103     -1,
 104     -1,
 105     -1,
 106     -1,
 107     -1,
 108     -1,
 109     -1,
 110     -1,
 111     -1,
 112     -1,
 113     -1,
 114 #ifdef __SIGRTMIN
 115     __SIGRTMIN + 1,
 116     __SIGRTMIN + 2,
 117     __SIGRTMIN + 3,
 118     __SIGRTMIN + 4,
 119     __SIGRTMIN + 5,
 120     __SIGRTMIN + 6,
 121     __SIGRTMIN + 7,
 122     __SIGRTMIN + 8,
 123     __SIGRTMIN + 9,
 124     __SIGRTMIN + 10,
 125     __SIGRTMIN + 11,
 126     __SIGRTMIN + 12,
 127     __SIGRTMIN + 13,
 128     __SIGRTMIN + 14,
 129     __SIGRTMIN + 15,
 130     __SIGRTMIN + 16,
 131     __SIGRTMIN + 17,
 132     __SIGRTMIN + 18,
 133     __SIGRTMIN + 19,
 134     __SIGRTMIN + 20,
 135     __SIGRTMIN + 21,
 136     __SIGRTMIN + 22,
 137     __SIGRTMIN + 23,
 138     __SIGRTMIN + 24,
 139     __SIGRTMIN + 25,
 140     __SIGRTMIN + 26,
 141     __SIGRTMIN + 27,
 142     __SIGRTMIN + 28,
 143     __SIGRTMIN + 29,
 144     __SIGRTMIN + 30,
 145     __SIGRTMIN + 31,
 146     -1, /* SIGCANCEL */
 147     __SIGRTMIN,
 148     __SIGRTMIN + 32,
 149     __SIGRTMIN + 33,
 150     __SIGRTMIN + 34,
 151     __SIGRTMIN + 35,
 152     __SIGRTMIN + 36,
 153     __SIGRTMIN + 37,
 154     __SIGRTMIN + 38,
 155     __SIGRTMIN + 39,
 156     __SIGRTMIN + 40,
 157     __SIGRTMIN + 41,
 158     __SIGRTMIN + 42,
 159     __SIGRTMIN + 43,
 160     __SIGRTMIN + 44,
 161     __SIGRTMIN + 45,
 162     __SIGRTMIN + 46,
 163     __SIGRTMIN + 47,
 164     __SIGRTMIN + 48,
 165     __SIGRTMIN + 49,
 166     __SIGRTMIN + 50,
 167     __SIGRTMIN + 51,
 168     __SIGRTMIN + 52,
 169     __SIGRTMIN + 53,
 170     __SIGRTMIN + 54,
 171     __SIGRTMIN + 55,
 172     __SIGRTMIN + 56,
 173     __SIGRTMIN + 57,
 174     __SIGRTMIN + 58,
 175     __SIGRTMIN + 59,
 176     __SIGRTMIN + 60,
 177     __SIGRTMIN + 61,
 178     __SIGRTMIN + 62,
 179     __SIGRTMIN + 63,
 180     __SIGRTMIN + 64,
 181     __SIGRTMIN + 65,
 182     __SIGRTMIN + 66,
 183     __SIGRTMIN + 67,
 184     __SIGRTMIN + 68,
 185     __SIGRTMIN + 69,
 186     __SIGRTMIN + 70,
 187     __SIGRTMIN + 71,
 188     __SIGRTMIN + 72,
 189     __SIGRTMIN + 73,
 190     __SIGRTMIN + 74,
 191     __SIGRTMIN + 75,
 192     __SIGRTMIN + 76,
 193     __SIGRTMIN + 77,
 194     __SIGRTMIN + 78,
 195     __SIGRTMIN + 79,
 196     __SIGRTMIN + 80,
 197     __SIGRTMIN + 81,
 198     __SIGRTMIN + 82,
 199     __SIGRTMIN + 83,
 200     __SIGRTMIN + 84,
 201     __SIGRTMIN + 85,
 202     __SIGRTMIN + 86,
 203     __SIGRTMIN + 87,
 204     __SIGRTMIN + 88,
 205     __SIGRTMIN + 89,
 206     __SIGRTMIN + 90,
 207     __SIGRTMIN + 91,
 208     __SIGRTMIN + 92,
 209     __SIGRTMIN + 93,
 210     __SIGRTMIN + 94,
 211     __SIGRTMIN + 95,
 212     -1, /* SIGINFO */
 213     -1, /* UNKNOWN */
 214     -1, /* DEFAULT */
 215     -1,
 216     -1,
 217     -1,
 218     -1,
 219     -1,
 220     -1
 221 #endif
 222 };
 223 #else
 224 /* In system mode we only need SIGINT and SIGTRAP; other signals
 225    are not yet supported.  */
 226
 227 enum {
 228     TARGET_SIGINT = 2,
 229     TARGET_SIGTRAP = 5
 230 };
 231
 232 static int gdb_signal_table[] = {
 233     -1,
 234     -1,
 235     TARGET_SIGINT,
 236     -1,
 237     -1,
 238     TARGET_SIGTRAP
 239 };
 240 #endif
 241
 242 #ifdef CONFIG_USER_ONLY
 243 static int target_signal_to_gdb (int sig)
 244 {
 245     int i;
 246     for (i = 0; i < ARRAY_SIZE (gdb_signal_table); i++)
 247         if (gdb_signal_table[i] == sig)
 248             return i;
 249     return GDB_SIGNAL_UNKNOWN;
 250 }
 251 #endif
 252
 253 static int gdb_signal_to_target (int sig)
 254 {
 255     if (sig < ARRAY_SIZE (gdb_signal_table))
 256         return gdb_signal_table[sig];
 257     else
 258         return -1;
 259 }
 260
 261 //#define DEBUG_GDB
 262
 263 typedef struct GDBRegisterState {
 264     int base_reg;
 265     int num_regs;
 266     gdb_reg_cb get_reg;
 267     gdb_reg_cb set_reg;
 268     const char *xml;
 269     struct GDBRegisterState *next;
 270 } GDBRegisterState;
 271
 272 enum RSState {
 273     RS_INACTIVE,
 274     RS_IDLE,
 275     RS_GETLINE,
 276     RS_CHKSUM1,
 277     RS_CHKSUM2,
 278     RS_SYSCALL,
 279 };
 280 typedef struct GDBState {
 281     CPUState *c_cpu; /* current CPU for step/continue ops */
 282     CPUState *g_cpu; /* current CPU for other ops */
 283     CPUState *query_cpu; /* for q{f|s}ThreadInfo */
 284     enum RSState state; /* parsing state */
 285     char line_buf[MAX_PACKET_LENGTH];
 286     int line_buf_index;
 287     int line_csum;
 288     uint8_t last_packet[MAX_PACKET_LENGTH + 4];
 289     int last_packet_len;
 290     int signal;
 291 #ifdef CONFIG_USER_ONLY
 292     int fd;
 293     int running_state;
 294 #else
 295     CharDriverState *chr;
 296     CharDriverState *mon_chr;
 297 #endif
 298 } GDBState;
 299
 300 /* By default use no IRQs and no timers while single stepping so as to
 301  * make single stepping like an ICE HW step.
 302  */
 303 static int sstep_flags = SSTEP_ENABLE|SSTEP_NOIRQ|SSTEP_NOTIMER;
 304
 305 static GDBState *gdbserver_state;
 306
 307 /* This is an ugly hack to cope with both new and old gdb.
 308    If gdb sends qXfer:features:read then assume we're talking to a newish
 309    gdb that understands target descriptions.  */
 310 static int gdb_has_xml;
 311
 312 #ifdef CONFIG_USER_ONLY
 313 /* XXX: This is not thread safe.  Do we care?  */
 314 static int gdbserver_fd = -1;
 315
 316 static int get_char(GDBState *s)
 317 {
 318     uint8_t ch;
 319     int ret;
 320
 321     for(;;) {
 322         ret = qemu_recv(s->fd, &ch, 1, 0);
 323         if (ret < 0) {
 324             if (errno == ECONNRESET)
 325                 s->fd = -1;
 326             if (errno != EINTR && errno != EAGAIN)
 327                 return -1;
 328         } else if (ret == 0) {
 329             close(s->fd);
 330             s->fd = -1;
 331             return -1;
 332         } else {
 333             break;
 334         }
 335     }
 336     return ch;
 337 }
 338 #endif
 339
 340 static gdb_syscall_complete_cb gdb_current_syscall_cb;
 341
 342 static enum {
 343     GDB_SYS_UNKNOWN,
 344     GDB_SYS_ENABLED,
 345     GDB_SYS_DISABLED,
 346 } gdb_syscall_mode;
 347
 348 /* If gdb is connected when the first semihosting syscall occurs then use
 349    remote gdb syscalls.  Otherwise use native file IO.  */
 350 int use_gdb_syscalls(void)
 351 {
 352     if (gdb_syscall_mode == GDB_SYS_UNKNOWN) {
 353         gdb_syscall_mode = (gdbserver_state ? GDB_SYS_ENABLED
 354                                             : GDB_SYS_DISABLED);
 355     }
 356     return gdb_syscall_mode == GDB_SYS_ENABLED;
 357 }
 358
 359 /* Resume execution.  */
 360 static inline void gdb_continue(GDBState *s)
 361 {
 362 #ifdef CONFIG_USER_ONLY
 363     s->running_state = 1;
 364 #else
 365     vm_start();
 366 #endif
 367 }
 368
 369 static void put_buffer(GDBState *s, const uint8_t *buf, int len)
 370 {
 371 #ifdef CONFIG_USER_ONLY
 372     int ret;
 373
 374     while (len > 0) {
 375         ret = send(s->fd, buf, len, 0);
 376         if (ret < 0) {
 377             if (errno != EINTR && errno != EAGAIN)
 378                 return;
 379         } else {
 380             buf += ret;
 381             len -= ret;
 382         }
 383     }
 384 #else
 385     qemu_chr_fe_write(s->chr, buf, len);
 386 #endif
 387 }
 388
 389 static inline int fromhex(int v)
 390 {
 391     if (v >= '0' && v <= '9')
 392         return v - '0';
 393     else if (v >= 'A' && v <= 'F')
 394         return v - 'A' + 10;
 395     else if (v >= 'a' && v <= 'f')
 396         return v - 'a' + 10;
 397     else
 398         return 0;
 399 }
 400
 401 static inline int tohex(int v)
 402 {
 403     if (v < 10)
 404         return v + '0';
 405     else
 406         return v - 10 + 'a';
 407 }
 408
 409 static void memtohex(char *buf, const uint8_t *mem, int len)
 410 {
 411     int i, c;
 412     char *q;
 413     q = buf;
 414     for(i = 0; i < len; i++) {
 415         c = mem[i];
 416         *q++ = tohex(c >> 4);
 417         *q++ = tohex(c & 0xf);
 418     }
 419     *q = '\0';
 420 }
 421
 422 static void hextomem(uint8_t *mem, const char *buf, int len)
 423 {
 424     int i;
 425
 426     for(i = 0; i < len; i++) {
 427         mem[i] = (fromhex(buf[0]) << 4) | fromhex(buf[1]);
 428         buf += 2;
 429     }
 430 }
 431
 432 /* return -1 if error, 0 if OK */
 433 static int put_packet_binary(GDBState *s, const char *buf, int len)
 434 {
 435     int csum, i;
 436     uint8_t *p;
 437
 438     for(;;) {
 439         p = s->last_packet;
 440         *(p++) = '$';
 441         memcpy(p, buf, len);
 442         p += len;
 443         csum = 0;
 444         for(i = 0; i < len; i++) {
 445             csum += buf[i];
 446         }
 447         *(p++) = '#';
 448         *(p++) = tohex((csum >> 4) & 0xf);
 449         *(p++) = tohex((csum) & 0xf);
 450
 451         s->last_packet_len = p - s->last_packet;
 452         put_buffer(s, (uint8_t *)s->last_packet, s->last_packet_len);
 453
 454 #ifdef CONFIG_USER_ONLY
 455         i = get_char(s);
 456         if (i < 0)
 457             return -1;
 458         if (i == '+')
 459             break;
 460 #else
 461         break;
 462 #endif
 463     }
 464     return 0;
 465 }
 466
 467 /* return -1 if error, 0 if OK */
 468 static int put_packet(GDBState *s, const char *buf)
 469 {
 470 #ifdef DEBUG_GDB
 471     printf("reply='%s'\n", buf);
 472 #endif
 473
 474     return put_packet_binary(s, buf, strlen(buf));
 475 }
 476
 477 /* The GDB remote protocol transfers values in target byte order.  This means
 478    we can use the raw memory access routines to access the value buffer.
 479    Conveniently, these also handle the case where the buffer is mis-aligned.
 480  */
 481 #define GET_REG8(val) do { \
 482     stb_p(mem_buf, val); \
 483     return 1; \
 484     } while(0)
 485 #define GET_REG16(val) do { \
 486     stw_p(mem_buf, val); \
 487     return 2; \
 488     } while(0)
 489 #define GET_REG32(val) do { \
 490     stl_p(mem_buf, val); \
 491     return 4; \
 492     } while(0)
 493 #define GET_REG64(val) do { \
 494     stq_p(mem_buf, val); \
 495     return 8; \
 496     } while(0)
 497
 498 #if TARGET_LONG_BITS == 64
 499 #define GET_REGL(val) GET_REG64(val)
 500 #define ldtul_p(addr) ldq_p(addr)
 501 #else
 502 #define GET_REGL(val) GET_REG32(val)
 503 #define ldtul_p(addr) ldl_p(addr)
 504 #endif
 505
 506 #if defined(TARGET_I386)
 507
 508 #ifdef TARGET_X86_64
 509 static const int gpr_map[16] = {
 510     R_EAX, R_EBX, R_ECX, R_EDX, R_ESI, R_EDI, R_EBP, R_ESP,
 511     8, 9, 10, 11, 12, 13, 14, 15
 512 };
 513 #else
 514 #define gpr_map gpr_map32
 515 #endif
 516 static const int gpr_map32[8] = { 0, 1, 2, 3, 4, 5, 6, 7 };
 517
 518 #define NUM_CORE_REGS (CPU_NB_REGS * 2 + 25)
 519
 520 #define IDX_IP_REG      CPU_NB_REGS
 521 #define IDX_FLAGS_REG   (IDX_IP_REG + 1)
 522 #define IDX_SEG_REGS    (IDX_FLAGS_REG + 1)
 523 #define IDX_FP_REGS     (IDX_SEG_REGS + 6)
 524 #define IDX_XMM_REGS    (IDX_FP_REGS + 16)
 525 #define IDX_MXCSR_REG   (IDX_XMM_REGS + CPU_NB_REGS)
 526
 527 static int cpu_gdb_read_register(CPUState *env, uint8_t *mem_buf, int n)
 528 {
 529     if (n < CPU_NB_REGS) {
 530         if (TARGET_LONG_BITS == 64 && env->hflags & HF_CS64_MASK) {
 531             GET_REG64(env->regs[gpr_map[n]]);
 532         } else if (n < CPU_NB_REGS32) {
 533             GET_REG32(env->regs[gpr_map32[n]]);
 534         }
 535     } else if (n >= IDX_FP_REGS && n < IDX_FP_REGS + 8) {
 536 #ifdef USE_X86LDOUBLE
 537         /* FIXME: byteswap float values - after fixing fpregs layout. */
 538         memcpy(mem_buf, &env->fpregs[n - IDX_FP_REGS], 10);
 539 #else
 540         memset(mem_buf, 0, 10);
 541 #endif
 542         return 10;
 543     } else if (n >= IDX_XMM_REGS && n < IDX_XMM_REGS + CPU_NB_REGS) {
 544         n -= IDX_XMM_REGS;
 545         if (n < CPU_NB_REGS32 ||
 546             (TARGET_LONG_BITS == 64 && env->hflags & HF_CS64_MASK)) {
 547             stq_p(mem_buf, env->xmm_regs[n].XMM_Q(0));
 548             stq_p(mem_buf + 8, env->xmm_regs[n].XMM_Q(1));
 549             return 16;
 550         }
 551     } else {
 552         switch (n) {
 553         case IDX_IP_REG:
 554             if (TARGET_LONG_BITS == 64 && env->hflags & HF_CS64_MASK) {
 555                 GET_REG64(env->eip);
 556             } else {
 557                 GET_REG32(env->eip);
 558             }
 559         case IDX_FLAGS_REG: GET_REG32(env->eflags);
 560
 561         case IDX_SEG_REGS:     GET_REG32(env->segs[R_CS].selector);
 562         case IDX_SEG_REGS + 1: GET_REG32(env->segs[R_SS].selector);
 563         case IDX_SEG_REGS + 2: GET_REG32(env->segs[R_DS].selector);
 564         case IDX_SEG_REGS + 3: GET_REG32(env->segs[R_ES].selector);
 565         case IDX_SEG_REGS + 4: GET_REG32(env->segs[R_FS].selector);
 566         case IDX_SEG_REGS + 5: GET_REG32(env->segs[R_GS].selector);
 567
 568         case IDX_FP_REGS + 8:  GET_REG32(env->fpuc);
 569         case IDX_FP_REGS + 9:  GET_REG32((env->fpus & ~0x3800) |
 570                                          (env->fpstt & 0x7) << 11);
 571         case IDX_FP_REGS + 10: GET_REG32(0); /* ftag */
 572         case IDX_FP_REGS + 11: GET_REG32(0); /* fiseg */
 573         case IDX_FP_REGS + 12: GET_REG32(0); /* fioff */
 574         case IDX_FP_REGS + 13: GET_REG32(0); /* foseg */
 575         case IDX_FP_REGS + 14: GET_REG32(0); /* fooff */
 576         case IDX_FP_REGS + 15: GET_REG32(0); /* fop */
 577
 578         case IDX_MXCSR_REG: GET_REG32(env->mxcsr);
 579         }
 580     }
 581     return 0;
 582 }
 583
 584 static int cpu_x86_gdb_load_seg(CPUState *env, int sreg, uint8_t *mem_buf)
 585 {
 586     uint16_t selector = ldl_p(mem_buf);
 587
 588     if (selector != env->segs[sreg].selector) {
 589 #if defined(CONFIG_USER_ONLY)
 590         cpu_x86_load_seg(env, sreg, selector);
 591 #else
 592         unsigned int limit, flags;
 593         target_ulong base;
 594
 595         if (!(env->cr[0] & CR0_PE_MASK) || (env->eflags & VM_MASK)) {
 596             base = selector << 4;
 597             limit = 0xffff;
 598             flags = 0;
 599         } else {
 600             if (!cpu_x86_get_descr_debug(env, selector, &base, &limit, &flags))
 601                 return 4;
 602         }
 603         cpu_x86_load_seg_cache(env, sreg, selector, base, limit, flags);
 604 #endif
 605     }
 606     return 4;
 607 }
 608
 609 static int cpu_gdb_write_register(CPUState *env, uint8_t *mem_buf, int n)
 610 {
 611     uint32_t tmp;
 612
 613     if (n < CPU_NB_REGS) {
 614         if (TARGET_LONG_BITS == 64 && env->hflags & HF_CS64_MASK) {
 615             env->regs[gpr_map[n]] = ldtul_p(mem_buf);
 616             return sizeof(target_ulong);
 617         } else if (n < CPU_NB_REGS32) {
 618             n = gpr_map32[n];
 619             env->regs[n] &= ~0xffffffffUL;
 620             env->regs[n] |= (uint32_t)ldl_p(mem_buf);
 621             return 4;
 622         }
 623     } else if (n >= IDX_FP_REGS && n < IDX_FP_REGS + 8) {
 624 #ifdef USE_X86LDOUBLE
 625         /* FIXME: byteswap float values - after fixing fpregs layout. */
 626         memcpy(&env->fpregs[n - IDX_FP_REGS], mem_buf, 10);
 627 #endif
 628         return 10;
 629     } else if (n >= IDX_XMM_REGS && n < IDX_XMM_REGS + CPU_NB_REGS) {
 630         n -= IDX_XMM_REGS;
 631         if (n < CPU_NB_REGS32 ||
 632             (TARGET_LONG_BITS == 64 && env->hflags & HF_CS64_MASK)) {
 633             env->xmm_regs[n].XMM_Q(0) = ldq_p(mem_buf);
 634             env->xmm_regs[n].XMM_Q(1) = ldq_p(mem_buf + 8);
 635             return 16;
 636         }
 637     } else {
 638         switch (n) {
 639         case IDX_IP_REG:
 640             if (TARGET_LONG_BITS == 64 && env->hflags & HF_CS64_MASK) {
 641                 env->eip = ldq_p(mem_buf);
 642                 return 8;
 643             } else {
 644                 env->eip &= ~0xffffffffUL;
 645                 env->eip |= (uint32_t)ldl_p(mem_buf);
 646                 return 4;
 647             }
 648         case IDX_FLAGS_REG:
 649             env->eflags = ldl_p(mem_buf);
 650             return 4;
 651
 652         case IDX_SEG_REGS:     return cpu_x86_gdb_load_seg(env, R_CS, mem_buf);
 653         case IDX_SEG_REGS + 1: return cpu_x86_gdb_load_seg(env, R_SS, mem_buf);
 654         case IDX_SEG_REGS + 2: return cpu_x86_gdb_load_seg(env, R_DS, mem_buf);
 655         case IDX_SEG_REGS + 3: return cpu_x86_gdb_load_seg(env, R_ES, mem_buf);
 656         case IDX_SEG_REGS + 4: return cpu_x86_gdb_load_seg(env, R_FS, mem_buf);
 657         case IDX_SEG_REGS + 5: return cpu_x86_gdb_load_seg(env, R_GS, mem_buf);
 658
 659         case IDX_FP_REGS + 8:
 660             env->fpuc = ldl_p(mem_buf);
 661             return 4;
 662         case IDX_FP_REGS + 9:
 663             tmp = ldl_p(mem_buf);
 664             env->fpstt = (tmp >> 11) & 7;
 665             env->fpus = tmp & ~0x3800;
 666             return 4;
 667         case IDX_FP_REGS + 10: /* ftag */  return 4;
 668         case IDX_FP_REGS + 11: /* fiseg */ return 4;
 669         case IDX_FP_REGS + 12: /* fioff */ return 4;
 670         case IDX_FP_REGS + 13: /* foseg */ return 4;
 671         case IDX_FP_REGS + 14: /* fooff */ return 4;
 672         case IDX_FP_REGS + 15: /* fop */   return 4;
 673
 674         case IDX_MXCSR_REG:
 675             env->mxcsr = ldl_p(mem_buf);
 676             return 4;
 677         }
 678     }
 679     /* Unrecognised register.  */
 680     return 0;
 681 }
 682
 683 #elif defined (TARGET_PPC)
 684
 685 /* Old gdb always expects FP registers.  Newer (xml-aware) gdb only
 686    expects whatever the target description contains.  Due to a
 687    historical mishap the FP registers appear in between core integer
 688    regs and PC, MSR, CR, and so forth.  We hack round this by giving the
 689    FP regs zero size when talking to a newer gdb.  */
 690 #define NUM_CORE_REGS 71
 691 #if defined (TARGET_PPC64)
 692 #define GDB_CORE_XML "power64-core.xml"
 693 #else
 694 #define GDB_CORE_XML "power-core.xml"
 695 #endif
 696
 697 static int cpu_gdb_read_register(CPUState *env, uint8_t *mem_buf, int n)
 698 {
 699     if (n < 32) {
 700         /* gprs */
 701         GET_REGL(env->gpr[n]);
 702     } else if (n < 64) {
 703         /* fprs */
 704         if (gdb_has_xml)
 705             return 0;
 706         stfq_p(mem_buf, env->fpr[n-32]);
 707         return 8;
 708     } else {
 709         switch (n) {
 710         case 64: GET_REGL(env->nip);
 711         case 65: GET_REGL(env->msr);
 712         case 66:
 713             {
 714                 uint32_t cr = 0;
 715                 int i;
 716                 for (i = 0; i < 8; i++)
 717                     cr |= env->crf[i] << (32 - ((i + 1) * 4));
 718                 GET_REG32(cr);
 719             }
 720         case 67: GET_REGL(env->lr);
 721         case 68: GET_REGL(env->ctr);
 722         case 69: GET_REGL(env->xer);
 723         case 70:
 724             {
 725                 if (gdb_has_xml)
 726                     return 0;
 727                 GET_REG32(0); /* fpscr */
 728             }
 729         }
 730     }
 731     return 0;
 732 }
 733
 734 static int cpu_gdb_write_register(CPUState *env, uint8_t *mem_buf, int n)
 735 {
 736     if (n < 32) {
 737         /* gprs */
 738         env->gpr[n] = ldtul_p(mem_buf);
 739         return sizeof(target_ulong);
 740     } else if (n < 64) {
 741         /* fprs */
 742         if (gdb_has_xml)
 743             return 0;
 744         env->fpr[n-32] = ldfq_p(mem_buf);
 745         return 8;
 746     } else {
 747         switch (n) {
 748         case 64:
 749             env->nip = ldtul_p(mem_buf);
 750             return sizeof(target_ulong);
 751         case 65:
 752             ppc_store_msr(env, ldtul_p(mem_buf));
 753             return sizeof(target_ulong);
 754         case 66:
 755             {
 756                 uint32_t cr = ldl_p(mem_buf);
 757                 int i;
 758                 for (i = 0; i < 8; i++)
 759                     env->crf[i] = (cr >> (32 - ((i + 1) * 4))) & 0xF;
 760                 return 4;
 761             }
 762         case 67:
 763             env->lr = ldtul_p(mem_buf);
 764             return sizeof(target_ulong);
 765         case 68:
 766             env->ctr = ldtul_p(mem_buf);
 767             return sizeof(target_ulong);
 768         case 69:
 769             env->xer = ldtul_p(mem_buf);
 770             return sizeof(target_ulong);
 771         case 70:
 772             /* fpscr */
 773             if (gdb_has_xml)
 774                 return 0;
 775             return 4;
 776         }
 777     }
 778     return 0;
 779 }
 780
 781 #elif defined (TARGET_SPARC)
 782
 783 #if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
 784 #define NUM_CORE_REGS 86
 785 #else
 786 #define NUM_CORE_REGS 72
 787 #endif
 788
 789 #ifdef TARGET_ABI32
 790 #define GET_REGA(val) GET_REG32(val)
 791 #else
 792 #define GET_REGA(val) GET_REGL(val)
 793 #endif
 794
 795 static int cpu_gdb_read_register(CPUState *env, uint8_t *mem_buf, int n)
 796 {
 797     if (n < 8) {
 798         /* g0..g7 */
 799         GET_REGA(env->gregs[n]);
 800     }
 801     if (n < 32) {
 802         /* register window */
 803         GET_REGA(env->regwptr[n - 8]);
 804     }
 805 #if defined(TARGET_ABI32) || !defined(TARGET_SPARC64)
 806     if (n < 64) {
 807         /* fprs */
 808         GET_REG32(*((uint32_t *)&env->fpr[n - 32]));
 809     }
 810     /* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */
 811     switch (n) {
 812     case 64: GET_REGA(env->y);
 813     case 65: GET_REGA(cpu_get_psr(env));
 814     case 66: GET_REGA(env->wim);
 815     case 67: GET_REGA(env->tbr);
 816     case 68: GET_REGA(env->pc);
 817     case 69: GET_REGA(env->npc);
 818     case 70: GET_REGA(env->fsr);
 819     case 71: GET_REGA(0); /* csr */
 820     default: GET_REGA(0);
 821     }
 822 #else
 823     if (n < 64) {
 824         /* f0-f31 */
 825         GET_REG32(*((uint32_t *)&env->fpr[n - 32]));
 826     }
 827     if (n < 80) {
 828         /* f32-f62 (double width, even numbers only) */
 829         uint64_t val;
 830
 831         val = (uint64_t)*((uint32_t *)&env->fpr[(n - 64) * 2 + 32]) << 32;
 832         val |= *((uint32_t *)&env->fpr[(n - 64) * 2 + 33]);
 833         GET_REG64(val);
 834     }
 835     switch (n) {
 836     case 80: GET_REGL(env->pc);
 837     case 81: GET_REGL(env->npc);
 838     case 82: GET_REGL((cpu_get_ccr(env) << 32) |
 839                       ((env->asi & 0xff) << 24) |
 840                       ((env->pstate & 0xfff) << 8) |
 841                       cpu_get_cwp64(env));
 842     case 83: GET_REGL(env->fsr);
 843     case 84: GET_REGL(env->fprs);
 844     case 85: GET_REGL(env->y);
 845     }
 846 #endif
 847     return 0;
 848 }
 849
 850 static int cpu_gdb_write_register(CPUState *env, uint8_t *mem_buf, int n)
 851 {
 852 #if defined(TARGET_ABI32)
 853     abi_ulong tmp;
 854
 855     tmp = ldl_p(mem_buf);
 856 #else
 857     target_ulong tmp;
 858
 859     tmp = ldtul_p(mem_buf);
 860 #endif
 861
 862     if (n < 8) {
 863         /* g0..g7 */
 864         env->gregs[n] = tmp;
 865     } else if (n < 32) {
 866         /* register window */
 867         env->regwptr[n - 8] = tmp;
 868     }
 869 #if defined(TARGET_ABI32) || !defined(TARGET_SPARC64)
 870     else if (n < 64) {
 871         /* fprs */
 872         *((uint32_t *)&env->fpr[n - 32]) = tmp;
 873     } else {
 874         /* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */
 875         switch (n) {
 876         case 64: env->y = tmp; break;
 877         case 65: cpu_put_psr(env, tmp); break;
 878         case 66: env->wim = tmp; break;
 879         case 67: env->tbr = tmp; break;
 880         case 68: env->pc = tmp; break;
 881         case 69: env->npc = tmp; break;
 882         case 70: env->fsr = tmp; break;
 883         default: return 0;
 884         }
 885     }
 886     return 4;
 887 #else
 888     else if (n < 64) {
 889         /* f0-f31 */
 890         env->fpr[n] = ldfl_p(mem_buf);
 891         return 4;
 892     } else if (n < 80) {
 893         /* f32-f62 (double width, even numbers only) */
 894         *((uint32_t *)&env->fpr[(n - 64) * 2 + 32]) = tmp >> 32;
 895         *((uint32_t *)&env->fpr[(n - 64) * 2 + 33]) = tmp;
 896     } else {
 897         switch (n) {
 898         case 80: env->pc = tmp; break;
 899         case 81: env->npc = tmp; break;
 900         case 82:
 901             cpu_put_ccr(env, tmp >> 32);
 902             env->asi = (tmp >> 24) & 0xff;
 903             env->pstate = (tmp >> 8) & 0xfff;
 904             cpu_put_cwp64(env, tmp & 0xff);
 905             break;
 906         case 83: env->fsr = tmp; break;
 907         case 84: env->fprs = tmp; break;
 908         case 85: env->y = tmp; break;
 909         default: return 0;
 910         }
 911     }
 912     return 8;
 913 #endif
 914 }
 915 #elif defined (TARGET_ARM)
 916
 917 /* Old gdb always expect FPA registers.  Newer (xml-aware) gdb only expect
 918    whatever the target description contains.  Due to a historical mishap
 919    the FPA registers appear in between core integer regs and the CPSR.
 920    We hack round this by giving the FPA regs zero size when talking to a
 921    newer gdb.  */
 922 #define NUM_CORE_REGS 26
 923 #define GDB_CORE_XML "arm-core.xml"
 924
 925 static int cpu_gdb_read_register(CPUState *env, uint8_t *mem_buf, int n)
 926 {
 927     if (n < 16) {
 928         /* Core integer register.  */
 929         GET_REG32(env->regs[n]);
 930     }
 931     if (n < 24) {
 932         /* FPA registers.  */
 933         if (gdb_has_xml)
 934             return 0;
 935         memset(mem_buf, 0, 12);
 936         return 12;
 937     }
 938     switch (n) {
 939     case 24:
 940         /* FPA status register.  */
 941         if (gdb_has_xml)
 942             return 0;
 943         GET_REG32(0);
 944     case 25:
 945         /* CPSR */
 946         GET_REG32(cpsr_read(env));
 947     }
 948     /* Unknown register.  */
 949     return 0;
 950 }
 951
 952 static int cpu_gdb_write_register(CPUState *env, uint8_t *mem_buf, int n)
 953 {
 954     uint32_t tmp;
 955
 956     tmp = ldl_p(mem_buf);
 957
 958     /* Mask out low bit of PC to workaround gdb bugs.  This will probably
 959        cause problems if we ever implement the Jazelle DBX extensions.  */
 960     if (n == 15)
 961         tmp &= ~1;
 962
 963     if (n < 16) {
 964         /* Core integer register.  */
 965         env->regs[n] = tmp;
 966         return 4;
 967     }
 968     if (n < 24) { /* 16-23 */
 969         /* FPA registers (ignored).  */
 970         if (gdb_has_xml)
 971             return 0;
 972         return 12;
 973     }
 974     switch (n) {
 975     case 24:
 976         /* FPA status register (ignored).  */
 977         if (gdb_has_xml)
 978             return 0;
 979         return 4;
 980     case 25:
 981         /* CPSR */
 982         cpsr_write (env, tmp, 0xffffffff);
 983         return 4;
 984     }
 985     /* Unknown register.  */
 986     return 0;
 987 }
 988
 989 #elif defined (TARGET_M68K)
 990
 991 #define NUM_CORE_REGS 18
 992
 993 #define GDB_CORE_XML "cf-core.xml"
 994
 995 static int cpu_gdb_read_register(CPUState *env, uint8_t *mem_buf, int n)
 996 {
 997     if (n < 8) {
 998         /* D0-D7 */
 999         GET_REG32(env->dregs[n]);
1000     } else if (n < 16) {
1001         /* A0-A7 */
1002         GET_REG32(env->aregs[n - 8]);
1003     } else {
1004         switch (n) {
1005         case 16: GET_REG32(env->sr);
1006         case 17: GET_REG32(env->pc);
1007         }
1008     }
1009     /* FP registers not included here because they vary between
1010        ColdFire and m68k.  Use XML bits for these.  */
1011     return 0;
1012 }
1013
1014 static int cpu_gdb_write_register(CPUState *env, uint8_t *mem_buf, int n)
1015 {
1016     uint32_t tmp;
1017
1018     tmp = ldl_p(mem_buf);
1019
1020     if (n < 8) {
1021         /* D0-D7 */
1022         env->dregs[n] = tmp;
1023     } else if (n < 16) {
1024         /* A0-A7 */
1025         env->aregs[n - 8] = tmp;
1026     } else {
1027         switch (n) {
1028         case 16: env->sr = tmp; break;
1029         case 17: env->pc = tmp; break;
1030         default: return 0;
1031         }
1032     }
1033     return 4;
1034 }
1035 #elif defined (TARGET_MIPS)
1036
1037 #define NUM_CORE_REGS 73
1038
1039 static int cpu_gdb_read_register(CPUState *env, uint8_t *mem_buf, int n)
1040 {
1041     if (n < 32) {
1042         GET_REGL(env->active_tc.gpr[n]);
1043     }
1044     if (env->CP0_Config1 & (1 << CP0C1_FP)) {
1045         if (n >= 38 && n < 70) {
1046             if (env->CP0_Status & (1 << CP0St_FR))
1047                 GET_REGL(env->active_fpu.fpr[n - 38].d);
1048             else
1049                 GET_REGL(env->active_fpu.fpr[n - 38].w[FP_ENDIAN_IDX]);
1050         }
1051         switch (n) {
1052         case 70: GET_REGL((int32_t)env->active_fpu.fcr31);
1053         case 71: GET_REGL((int32_t)env->active_fpu.fcr0);
1054         }
1055     }
1056     switch (n) {
1057     case 32: GET_REGL((int32_t)env->CP0_Status);
1058     case 33: GET_REGL(env->active_tc.LO[0]);
1059     case 34: GET_REGL(env->active_tc.HI[0]);
1060     case 35: GET_REGL(env->CP0_BadVAddr);
1061     case 36: GET_REGL((int32_t)env->CP0_Cause);
1062     case 37: GET_REGL(env->active_tc.PC | !!(env->hflags & MIPS_HFLAG_M16));
1063     case 72: GET_REGL(0); /* fp */
1064     case 89: GET_REGL((int32_t)env->CP0_PRid);
1065     }
1066     if (n >= 73 && n <= 88) {
1067         /* 16 embedded regs.  */
1068         GET_REGL(0);
1069     }
1070
1071     return 0;
1072 }
1073
1074 /* convert MIPS rounding mode in FCR31 to IEEE library */
1075 static unsigned int ieee_rm[] =
1076   {
1077     float_round_nearest_even,
1078     float_round_to_zero,
1079     float_round_up,
1080     float_round_down
1081   };
1082 #define RESTORE_ROUNDING_MODE \
1083     set_float_rounding_mode(ieee_rm[env->active_fpu.fcr31 & 3], &env->active_fpu.fp_status)
1084
1085 static int cpu_gdb_write_register(CPUState *env, uint8_t *mem_buf, int n)
1086 {
1087     target_ulong tmp;
1088
1089     tmp = ldtul_p(mem_buf);
1090
1091     if (n < 32) {
1092         env->active_tc.gpr[n] = tmp;
1093         return sizeof(target_ulong);
1094     }
1095     if (env->CP0_Config1 & (1 << CP0C1_FP)
1096             && n >= 38 && n < 73) {
1097         if (n < 70) {
1098             if (env->CP0_Status & (1 << CP0St_FR))
1099               env->active_fpu.fpr[n - 38].d = tmp;
1100             else
1101               env->active_fpu.fpr[n - 38].w[FP_ENDIAN_IDX] = tmp;
1102         }
1103         switch (n) {
1104         case 70:
1105             env->active_fpu.fcr31 = tmp & 0xFF83FFFF;
1106             /* set rounding mode */
1107             RESTORE_ROUNDING_MODE;
1108             break;
1109         case 71: env->active_fpu.fcr0 = tmp; break;
1110         }
1111         return sizeof(target_ulong);
1112     }
1113     switch (n) {
1114     case 32: env->CP0_Status = tmp; break;
1115     case 33: env->active_tc.LO[0] = tmp; break;
1116     case 34: env->active_tc.HI[0] = tmp; break;
1117     case 35: env->CP0_BadVAddr = tmp; break;
1118     case 36: env->CP0_Cause = tmp; break;
1119     case 37:
1120         env->active_tc.PC = tmp & ~(target_ulong)1;
1121         if (tmp & 1) {
1122             env->hflags |= MIPS_HFLAG_M16;
1123         } else {
1124             env->hflags &= ~(MIPS_HFLAG_M16);
1125         }
1126         break;
1127     case 72: /* fp, ignored */ break;
1128     default:
1129         if (n > 89)
1130             return 0;
1131         /* Other registers are readonly.  Ignore writes.  */
1132         break;
1133     }
1134
1135     return sizeof(target_ulong);
1136 }
1137 #elif defined (TARGET_SH4)
1138
1139 /* Hint: Use "set architecture sh4" in GDB to see fpu registers */
1140 /* FIXME: We should use XML for this.  */
1141
1142 #define NUM_CORE_REGS 59
1143
1144 static int cpu_gdb_read_register(CPUState *env, uint8_t *mem_buf, int n)
1145 {
1146     if (n < 8) {
1147         if ((env->sr & (SR_MD | SR_RB)) == (SR_MD | SR_RB)) {
1148             GET_REGL(env->gregs[n + 16]);
1149         } else {
1150             GET_REGL(env->gregs[n]);
1151         }
1152     } else if (n < 16) {
1153         GET_REGL(env->gregs[n]);
1154     } else if (n >= 25 && n < 41) {
1155         GET_REGL(env->fregs[(n - 25) + ((env->fpscr & FPSCR_FR) ? 16 : 0)]);
1156     } else if (n >= 43 && n < 51) {
1157         GET_REGL(env->gregs[n - 43]);
1158     } else if (n >= 51 && n < 59) {
1159         GET_REGL(env->gregs[n - (51 - 16)]);
1160     }
1161     switch (n) {
1162     case 16: GET_REGL(env->pc);
1163     case 17: GET_REGL(env->pr);
1164     case 18: GET_REGL(env->gbr);
1165     case 19: GET_REGL(env->vbr);
1166     case 20: GET_REGL(env->mach);
1167     case 21: GET_REGL(env->macl);
1168     case 22: GET_REGL(env->sr);
1169     case 23: GET_REGL(env->fpul);
1170     case 24: GET_REGL(env->fpscr);
1171     case 41: GET_REGL(env->ssr);
1172     case 42: GET_REGL(env->spc);
1173     }
1174
1175     return 0;
1176 }
1177
1178 static int cpu_gdb_write_register(CPUState *env, uint8_t *mem_buf, int n)
1179 {
1180     uint32_t tmp;
1181
1182     tmp = ldl_p(mem_buf);
1183
1184     if (n < 8) {
1185         if ((env->sr & (SR_MD | SR_RB)) == (SR_MD | SR_RB)) {
1186             env->gregs[n + 16] = tmp;
1187         } else {
1188             env->gregs[n] = tmp;
1189         }
1190         return 4;
1191     } else if (n < 16) {
1192         env->gregs[n] = tmp;
1193         return 4;
1194     } else if (n >= 25 && n < 41) {
1195         env->fregs[(n - 25) + ((env->fpscr & FPSCR_FR) ? 16 : 0)] = tmp;
1196         return 4;
1197     } else if (n >= 43 && n < 51) {
1198         env->gregs[n - 43] = tmp;
1199         return 4;
1200     } else if (n >= 51 && n < 59) {
1201         env->gregs[n - (51 - 16)] = tmp;
1202         return 4;
1203     }
1204     switch (n) {
1205     case 16: env->pc = tmp; break;
1206     case 17: env->pr = tmp; break;
1207     case 18: env->gbr = tmp; break;
1208     case 19: env->vbr = tmp; break;
1209     case 20: env->mach = tmp; break;
1210     case 21: env->macl = tmp; break;
1211     case 22: env->sr = tmp; break;
1212     case 23: env->fpul = tmp; break;
1213     case 24: env->fpscr = tmp; break;
1214     case 41: env->ssr = tmp; break;
1215     case 42: env->spc = tmp; break;
1216     default: return 0;
1217     }
1218
1219     return 4;
1220 }
1221 #elif defined (TARGET_MICROBLAZE)
1222
1223 #define NUM_CORE_REGS (32 + 5)
1224
1225 static int cpu_gdb_read_register(CPUState *env, uint8_t *mem_buf, int n)
1226 {
1227     if (n < 32) {
1228         GET_REG32(env->regs[n]);
1229     } else {
1230         GET_REG32(env->sregs[n - 32]);
1231     }
1232     return 0;
1233 }
1234
1235 static int cpu_gdb_write_register(CPUState *env, uint8_t *mem_buf, int n)
1236 {
1237     uint32_t tmp;
1238
1239     if (n > NUM_CORE_REGS)
1240         return 0;
1241
1242     tmp = ldl_p(mem_buf);
1243
1244     if (n < 32) {
1245         env->regs[n] = tmp;
1246     } else {
1247         env->sregs[n - 32] = tmp;
1248     }
1249     return 4;
1250 }
1251 #elif defined (TARGET_CRIS)
1252
1253 #define NUM_CORE_REGS 49
1254
1255 static int
1256 read_register_crisv10(CPUState *env, uint8_t *mem_buf, int n)
1257 {
1258     if (n < 15) {
1259         GET_REG32(env->regs[n]);
1260     }
1261
1262     if (n == 15) {
1263         GET_REG32(env->pc);
1264     }
1265
1266     if (n < 32) {
1267         switch (n) {
1268         case 16:
1269             GET_REG8(env->pregs[n - 16]);
1270             break;
1271         case 17:
1272             GET_REG8(env->pregs[n - 16]);
1273             break;
1274         case 20:
1275         case 21:
1276             GET_REG16(env->pregs[n - 16]);
1277             break;
1278         default:
1279             if (n >= 23) {
1280                 GET_REG32(env->pregs[n - 16]);
1281             }
1282             break;
1283         }
1284     }
1285     return 0;
1286 }
1287
1288 static int cpu_gdb_read_register(CPUState *env, uint8_t *mem_buf, int n)
1289 {
1290     uint8_t srs;
1291
1292     if (env->pregs[PR_VR] < 32)
1293         return read_register_crisv10(env, mem_buf, n);
1294
1295     srs = env->pregs[PR_SRS];
1296     if (n < 16) {
1297         GET_REG32(env->regs[n]);
1298     }
1299
1300     if (n >= 21 && n < 32) {
1301         GET_REG32(env->pregs[n - 16]);
1302     }
1303     if (n >= 33 && n < 49) {
1304         GET_REG32(env->sregs[srs][n - 33]);
1305     }
1306     switch (n) {
1307     case 16: GET_REG8(env->pregs[0]);
1308     case 17: GET_REG8(env->pregs[1]);
1309     case 18: GET_REG32(env->pregs[2]);
1310     case 19: GET_REG8(srs);
1311     case 20: GET_REG16(env->pregs[4]);
1312     case 32: GET_REG32(env->pc);
1313     }
1314
1315     return 0;
1316 }
1317
1318 static int cpu_gdb_write_register(CPUState *env, uint8_t *mem_buf, int n)
1319 {
1320     uint32_t tmp;
1321
1322     if (n > 49)
1323         return 0;
1324
1325     tmp = ldl_p(mem_buf);
1326
1327     if (n < 16) {
1328         env->regs[n] = tmp;
1329     }
1330
1331     if (n >= 21 && n < 32) {
1332         env->pregs[n - 16] = tmp;
1333     }
1334
1335     /* FIXME: Should support function regs be writable?  */
1336     switch (n) {
1337     case 16: return 1;
1338     case 17: return 1;
1339     case 18: env->pregs[PR_PID] = tmp; break;
1340     case 19: return 1;
1341     case 20: return 2;
1342     case 32: env->pc = tmp; break;
1343     }
1344
1345     return 4;
1346 }
1347 #elif defined (TARGET_ALPHA)
1348
1349 #define NUM_CORE_REGS 67
1350
1351 static int cpu_gdb_read_register(CPUState *env, uint8_t *mem_buf, int n)
1352 {
1353     uint64_t val;
1354     CPU_DoubleU d;
1355
1356     switch (n) {
1357     case 0 ... 30:
1358         val = env->ir[n];
1359         break;
1360     case 32 ... 62:
1361         d.d = env->fir[n - 32];
1362         val = d.ll;
1363         break;
1364     case 63:
1365         val = cpu_alpha_load_fpcr(env);
1366         break;
1367     case 64:
1368         val = env->pc;
1369         break;
1370     case 66:
1371         val = env->unique;
1372         break;
1373     case 31:
1374     case 65:
1375         /* 31 really is the zero register; 65 is unassigned in the
1376            gdb protocol, but is still required to occupy 8 bytes. */
1377         val = 0;
1378         break;
1379     default:
1380         return 0;
1381     }
1382     GET_REGL(val);
1383 }
1384
1385 static int cpu_gdb_write_register(CPUState *env, uint8_t *mem_buf, int n)
1386 {
1387     target_ulong tmp = ldtul_p(mem_buf);
1388     CPU_DoubleU d;
1389
1390     switch (n) {
1391     case 0 ... 30:
1392         env->ir[n] = tmp;
1393         break;
1394     case 32 ... 62:
1395         d.ll = tmp;
1396         env->fir[n - 32] = d.d;
1397         break;
1398     case 63:
1399         cpu_alpha_store_fpcr(env, tmp);
1400         break;
1401     case 64:
1402         env->pc = tmp;
1403         break;
1404     case 66:
1405         env->unique = tmp;
1406         break;
1407     case 31:
1408     case 65:
1409         /* 31 really is the zero register; 65 is unassigned in the
1410            gdb protocol, but is still required to occupy 8 bytes. */
1411         break;
1412     default:
1413         return 0;
1414     }
1415     return 8;
1416 }
1417 #elif defined (TARGET_S390X)
1418
1419 #define NUM_CORE_REGS S390_NUM_TOTAL_REGS
1420
1421 static int cpu_gdb_read_register(CPUState *env, uint8_t *mem_buf, int n)
1422 {
1423     switch (n) {
1424         case S390_PSWM_REGNUM: GET_REGL(env->psw.mask); break;
1425         case S390_PSWA_REGNUM: GET_REGL(env->psw.addr); break;
1426         case S390_R0_REGNUM ... S390_R15_REGNUM:
1427             GET_REGL(env->regs[n-S390_R0_REGNUM]); break;
1428         case S390_A0_REGNUM ... S390_A15_REGNUM:
1429             GET_REG32(env->aregs[n-S390_A0_REGNUM]); break;
1430         case S390_FPC_REGNUM: GET_REG32(env->fpc); break;
1431         case S390_F0_REGNUM ... S390_F15_REGNUM:
1432             /* XXX */
1433             break;
1434         case S390_PC_REGNUM: GET_REGL(env->psw.addr); break;
1435         case S390_CC_REGNUM:
1436             env->cc_op = calc_cc(env, env->cc_op, env->cc_src, env->cc_dst,
1437                                  env->cc_vr);
1438             GET_REG32(env->cc_op);
1439             break;
1440     }
1441
1442     return 0;
1443 }
1444
1445 static int cpu_gdb_write_register(CPUState *env, uint8_t *mem_buf, int n)
1446 {
1447     target_ulong tmpl;
1448     uint32_t tmp32;
1449     int r = 8;
1450     tmpl = ldtul_p(mem_buf);
1451     tmp32 = ldl_p(mem_buf);
1452
1453     switch (n) {
1454         case S390_PSWM_REGNUM: env->psw.mask = tmpl; break;
1455         case S390_PSWA_REGNUM: env->psw.addr = tmpl; break;
1456         case S390_R0_REGNUM ... S390_R15_REGNUM:
1457             env->regs[n-S390_R0_REGNUM] = tmpl; break;
1458         case S390_A0_REGNUM ... S390_A15_REGNUM:
1459             env->aregs[n-S390_A0_REGNUM] = tmp32; r=4; break;
1460         case S390_FPC_REGNUM: env->fpc = tmp32; r=4; break;
1461         case S390_F0_REGNUM ... S390_F15_REGNUM:
1462             /* XXX */
1463             break;
1464         case S390_PC_REGNUM: env->psw.addr = tmpl; break;
1465         case S390_CC_REGNUM: env->cc_op = tmp32; r=4; break;
1466     }
1467
1468     return r;
1469 }
1470 #elif defined (TARGET_LM32)
1471
1472 #include "hw/lm32_pic.h"
1473 #define NUM_CORE_REGS (32 + 7)
1474
1475 static int cpu_gdb_read_register(CPUState *env, uint8_t *mem_buf, int n)
1476 {
1477     if (n < 32) {
1478         GET_REG32(env->regs[n]);
1479     } else {
1480         switch (n) {
1481         case 32:
1482             GET_REG32(env->pc);
1483             break;
1484         /* FIXME: put in right exception ID */
1485         case 33:
1486             GET_REG32(0);
1487             break;
1488         case 34:
1489             GET_REG32(env->eba);
1490             break;
1491         case 35:
1492             GET_REG32(env->deba);
1493             break;
1494         case 36:
1495             GET_REG32(env->ie);
1496             break;
1497         case 37:
1498             GET_REG32(lm32_pic_get_im(env->pic_state));
1499             break;
1500         case 38:
1501             GET_REG32(lm32_pic_get_ip(env->pic_state));
1502             break;
1503         }
1504     }
1505     return 0;
1506 }
1507
1508 static int cpu_gdb_write_register(CPUState *env, uint8_t *mem_buf, int n)
1509 {
1510     uint32_t tmp;
1511
1512     if (n > NUM_CORE_REGS) {
1513         return 0;
1514     }
1515
1516     tmp = ldl_p(mem_buf);
1517
1518     if (n < 32) {
1519         env->regs[n] = tmp;
1520     } else {
1521         switch (n) {
1522         case 32:
1523             env->pc = tmp;
1524             break;
1525         case 34:
1526             env->eba = tmp;
1527             break;
1528         case 35:
1529             env->deba = tmp;
1530             break;
1531         case 36:
1532             env->ie = tmp;
1533             break;
1534         case 37:
1535             lm32_pic_set_im(env->pic_state, tmp);
1536             break;
1537         case 38:
1538             lm32_pic_set_ip(env->pic_state, tmp);
1539             break;
1540         }
1541     }
1542     return 4;
1543 }
1544 #else
1545
1546 #define NUM_CORE_REGS 0
1547
1548 static int cpu_gdb_read_register(CPUState *env, uint8_t *mem_buf, int n)
1549 {
1550     return 0;
1551 }
1552
1553 static int cpu_gdb_write_register(CPUState *env, uint8_t *mem_buf, int n)
1554 {
1555     return 0;
1556 }
1557
1558 #endif
1559
1560 static int num_g_regs = NUM_CORE_REGS;
1561
1562 #ifdef GDB_CORE_XML
1563 /* Encode data using the encoding for 'x' packets.  */
1564 static int memtox(char *buf, const char *mem, int len)
1565 {
1566     char *p = buf;
1567     char c;
1568
1569     while (len--) {
1570         c = *(mem++);
1571         switch (c) {
1572         case '#': case '$': case '*': case '}':
1573             *(p++) = '}';
1574             *(p++) = c ^ 0x20;
1575             break;
1576         default:
1577             *(p++) = c;
1578             break;
1579         }
1580     }
1581     return p - buf;
1582 }
1583
1584 static const char *get_feature_xml(const char *p, const char **newp)
1585 {
1586     size_t len;
1587     int i;
1588     const char *name;
1589     static char target_xml[1024];
1590
1591     len = 0;
1592     while (p[len] && p[len] != ':')
1593         len++;
1594     *newp = p + len;
1595
1596     name = NULL;
1597     if (strncmp(p, "target.xml", len) == 0) {
1598         /* Generate the XML description for this CPU.  */
1599         if (!target_xml[0]) {
1600             GDBRegisterState *r;
1601
1602             snprintf(target_xml, sizeof(target_xml),
1603                      "<?xml version=\"1.0\"?>"
1604                      "<!DOCTYPE target SYSTEM \"gdb-target.dtd\">"
1605                      "<target>"
1606                      "<xi:include href=\"%s\"/>",
1607                      GDB_CORE_XML);
1608
1609             for (r = first_cpu->gdb_regs; r; r = r->next) {
1610                 pstrcat(target_xml, sizeof(target_xml), "<xi:include href=\"");
1611                 pstrcat(target_xml, sizeof(target_xml), r->xml);
1612                 pstrcat(target_xml, sizeof(target_xml), "\"/>");
1613             }
1614             pstrcat(target_xml, sizeof(target_xml), "</target>");
1615         }
1616         return target_xml;
1617     }
1618     for (i = 0; ; i++) {
1619         name = xml_builtin[i][0];
1620         if (!name || (strncmp(name, p, len) == 0 && strlen(name) == len))
1621             break;
1622     }
1623     return name ? xml_builtin[i][1] : NULL;
1624 }
1625 #endif
1626
1627 static int gdb_read_register(CPUState *env, uint8_t *mem_buf, int reg)
1628 {
1629     GDBRegisterState *r;
1630
1631     if (reg < NUM_CORE_REGS)
1632         return cpu_gdb_read_register(env, mem_buf, reg);
1633
1634     for (r = env->gdb_regs; r; r = r->next) {
1635         if (r->base_reg <= reg && reg < r->base_reg + r->num_regs) {
1636             return r->get_reg(env, mem_buf, reg - r->base_reg);
1637         }
1638     }
1639     return 0;
1640 }
1641
1642 static int gdb_write_register(CPUState *env, uint8_t *mem_buf, int reg)
1643 {
1644     GDBRegisterState *r;
1645
1646     if (reg < NUM_CORE_REGS)
1647         return cpu_gdb_write_register(env, mem_buf, reg);
1648
1649     for (r = env->gdb_regs; r; r = r->next) {
1650         if (r->base_reg <= reg && reg < r->base_reg + r->num_regs) {
1651             return r->set_reg(env, mem_buf, reg - r->base_reg);
1652         }
1653     }
1654     return 0;
1655 }
1656
1657 /* Register a supplemental set of CPU registers.  If g_pos is nonzero it
1658    specifies the first register number and these registers are included in
1659    a standard "g" packet.  Direction is relative to gdb, i.e. get_reg is
1660    gdb reading a CPU register, and set_reg is gdb modifying a CPU register.
1661  */
1662
1663 void gdb_register_coprocessor(CPUState * env,
1664                              gdb_reg_cb get_reg, gdb_reg_cb set_reg,
1665                              int num_regs, const char *xml, int g_pos)
1666 {
1667     GDBRegisterState *s;
1668     GDBRegisterState **p;
1669     static int last_reg = NUM_CORE_REGS;
1670
1671     s = (GDBRegisterState *)qemu_mallocz(sizeof(GDBRegisterState));
1672     s->base_reg = last_reg;
1673     s->num_regs = num_regs;
1674     s->get_reg = get_reg;
1675     s->set_reg = set_reg;
1676     s->xml = xml;
1677     p = &env->gdb_regs;
1678     while (*p) {
1679         /* Check for duplicates.  */
1680         if (strcmp((*p)->xml, xml) == 0)
1681             return;
1682         p = &(*p)->next;
1683     }
1684     /* Add to end of list.  */
1685     last_reg += num_regs;
1686     *p = s;
1687     if (g_pos) {
1688         if (g_pos != s->base_reg) {
1689             fprintf(stderr, "Error: Bad gdb register numbering for '%s'\n"
1690                     "Expected %d got %d\n", xml, g_pos, s->base_reg);
1691         } else {
1692             num_g_regs = last_reg;
1693         }
1694     }
1695 }
1696
1697 #ifndef CONFIG_USER_ONLY
1698 static const int xlat_gdb_type[] = {
1699     [GDB_WATCHPOINT_WRITE]  = BP_GDB | BP_MEM_WRITE,
1700     [GDB_WATCHPOINT_READ]   = BP_GDB | BP_MEM_READ,
1701     [GDB_WATCHPOINT_ACCESS] = BP_GDB | BP_MEM_ACCESS,
1702 };
1703 #endif
1704
1705 static int gdb_breakpoint_insert(target_ulong addr, target_ulong len, int type)
1706 {
1707     CPUState *env;
1708     int err = 0;
1709
1710     if (kvm_enabled())
1711         return kvm_insert_breakpoint(gdbserver_state->c_cpu, addr, len, type);
1712
1713     switch (type) {
1714     case GDB_BREAKPOINT_SW:
1715     case GDB_BREAKPOINT_HW:
1716         for (env = first_cpu; env != NULL; env = env->next_cpu) {
1717             err = cpu_breakpoint_insert(env, addr, BP_GDB, NULL);
1718             if (err)
1719                 break;
1720         }
1721         return err;
1722 #ifndef CONFIG_USER_ONLY
1723     case GDB_WATCHPOINT_WRITE:
1724     case GDB_WATCHPOINT_READ:
1725     case GDB_WATCHPOINT_ACCESS:
1726         for (env = first_cpu; env != NULL; env = env->next_cpu) {
1727             err = cpu_watchpoint_insert(env, addr, len, xlat_gdb_type[type],
1728                                         NULL);
1729             if (err)
1730                 break;
1731         }
1732         return err;
1733 #endif
1734     default:
1735         return -ENOSYS;
1736     }
1737 }
1738
1739 static int gdb_breakpoint_remove(target_ulong addr, target_ulong len, int type)
1740 {
1741     CPUState *env;
1742     int err = 0;
1743
1744     if (kvm_enabled())
1745         return kvm_remove_breakpoint(gdbserver_state->c_cpu, addr, len, type);
1746
1747     switch (type) {
1748     case GDB_BREAKPOINT_SW:
1749     case GDB_BREAKPOINT_HW:
1750         for (env = first_cpu; env != NULL; env = env->next_cpu) {
1751             err = cpu_breakpoint_remove(env, addr, BP_GDB);
1752             if (err)
1753                 break;
1754         }
1755         return err;
1756 #ifndef CONFIG_USER_ONLY
1757     case GDB_WATCHPOINT_WRITE:
1758     case GDB_WATCHPOINT_READ:
1759     case GDB_WATCHPOINT_ACCESS:
1760         for (env = first_cpu; env != NULL; env = env->next_cpu) {
1761             err = cpu_watchpoint_remove(env, addr, len, xlat_gdb_type[type]);
1762             if (err)
1763                 break;
1764         }
1765         return err;
1766 #endif
1767     default:
1768         return -ENOSYS;
1769     }
1770 }
1771
1772 static void gdb_breakpoint_remove_all(void)
1773 {
1774     CPUState *env;
1775
1776     if (kvm_enabled()) {
1777         kvm_remove_all_breakpoints(gdbserver_state->c_cpu);
1778         return;
1779     }
1780
1781     for (env = first_cpu; env != NULL; env = env->next_cpu) {
1782         cpu_breakpoint_remove_all(env, BP_GDB);
1783 #ifndef CONFIG_USER_ONLY
1784         cpu_watchpoint_remove_all(env, BP_GDB);
1785 #endif
1786     }
1787 }
1788
1789 static void gdb_set_cpu_pc(GDBState *s, target_ulong pc)
1790 {
1791 #if defined(TARGET_I386)
1792     cpu_synchronize_state(s->c_cpu);
1793     s->c_cpu->eip = pc;
1794 #elif defined (TARGET_PPC)
1795     s->c_cpu->nip = pc;
1796 #elif defined (TARGET_SPARC)
1797     s->c_cpu->pc = pc;
1798     s->c_cpu->npc = pc + 4;
1799 #elif defined (TARGET_ARM)
1800     s->c_cpu->regs[15] = pc;
1801 #elif defined (TARGET_SH4)
1802     s->c_cpu->pc = pc;
1803 #elif defined (TARGET_MIPS)
1804     s->c_cpu->active_tc.PC = pc & ~(target_ulong)1;
1805     if (pc & 1) {
1806         s->c_cpu->hflags |= MIPS_HFLAG_M16;
1807     } else {
1808         s->c_cpu->hflags &= ~(MIPS_HFLAG_M16);
1809     }
1810 #elif defined (TARGET_MICROBLAZE)
1811     s->c_cpu->sregs[SR_PC] = pc;
1812 #elif defined (TARGET_CRIS)
1813     s->c_cpu->pc = pc;
1814 #elif defined (TARGET_ALPHA)
1815     s->c_cpu->pc = pc;
1816 #elif defined (TARGET_S390X)
1817     cpu_synchronize_state(s->c_cpu);
1818     s->c_cpu->psw.addr = pc;
1819 #elif defined (TARGET_LM32)
1820     s->c_cpu->pc = pc;
1821 #endif
1822 }
1823
1824 static inline int gdb_id(CPUState *env)
1825 {
1826 #if defined(CONFIG_USER_ONLY) && defined(CONFIG_USE_NPTL)
1827     return env->host_tid;
1828 #else
1829     return env->cpu_index + 1;
1830 #endif
1831 }
1832
1833 static CPUState *find_cpu(uint32_t thread_id)
1834 {
1835     CPUState *env;
1836
1837     for (env = first_cpu; env != NULL; env = env->next_cpu) {
1838         if (gdb_id(env) == thread_id) {
1839             return env;
1840         }
1841     }
1842
1843     return NULL;
1844 }
1845
1846 static int gdb_handle_packet(GDBState *s, const char *line_buf)
1847 {
1848     CPUState *env;
1849     const char *p;
1850     uint32_t thread;
1851     int ch, reg_size, type, res;
1852     char buf[MAX_PACKET_LENGTH];
1853     uint8_t mem_buf[MAX_PACKET_LENGTH];
1854     uint8_t *registers;
1855     target_ulong addr, len;
1856
1857 #ifdef DEBUG_GDB
1858     printf("command='%s'\n", line_buf);
1859 #endif
1860     p = line_buf;
1861     ch = *p++;
1862     switch(ch) {
1863     case '?':
1864         /* TODO: Make this return the correct value for user-mode.  */
1865         snprintf(buf, sizeof(buf), "T%02xthread:%02x;", GDB_SIGNAL_TRAP,
1866                  gdb_id(s->c_cpu));
1867         put_packet(s, buf);
1868         /* Remove all the breakpoints when this query is issued,
1869          * because gdb is doing and initial connect and the state
1870          * should be cleaned up.
1871          */
1872         gdb_breakpoint_remove_all();
1873         break;
1874     case 'c':
1875         if (*p != '\0') {
1876             addr = strtoull(p, (char **)&p, 16);
1877             gdb_set_cpu_pc(s, addr);
1878         }
1879         s->signal = 0;
1880         gdb_continue(s);
1881         return RS_IDLE;
1882     case 'C':
1883         s->signal = gdb_signal_to_target (strtoul(p, (char **)&p, 16));
1884         if (s->signal == -1)
1885             s->signal = 0;
1886         gdb_continue(s);
1887         return RS_IDLE;
1888     case 'v':
1889         if (strncmp(p, "Cont", 4) == 0) {
1890             int res_signal, res_thread;
1891
1892             p += 4;
1893             if (*p == '?') {
1894                 put_packet(s, "vCont;c;C;s;S");
1895                 break;
1896             }
1897             res = 0;
1898             res_signal = 0;
1899             res_thread = 0;
1900             while (*p) {
1901                 int action, signal;
1902
1903                 if (*p++ != ';') {
1904                     res = 0;
1905                     break;
1906                 }
1907                 action = *p++;
1908                 signal = 0;
1909                 if (action == 'C' || action == 'S') {
1910                     signal = strtoul(p, (char **)&p, 16);
1911                 } else if (action != 'c' && action != 's') {
1912                     res = 0;
1913                     break;
1914                 }
1915                 thread = 0;
1916                 if (*p == ':') {
1917                     thread = strtoull(p+1, (char **)&p, 16);
1918                 }
1919                 action = tolower(action);
1920                 if (res == 0 || (res == 'c' && action == 's')) {
1921                     res = action;
1922                     res_signal = signal;
1923                     res_thread = thread;
1924                 }
1925             }
1926             if (res) {
1927                 if (res_thread != -1 && res_thread != 0) {
1928                     env = find_cpu(res_thread);
1929                     if (env == NULL) {
1930                         put_packet(s, "E22");
1931                         break;
1932                     }
1933                     s->c_cpu = env;
1934                 }
1935                 if (res == 's') {
1936                     cpu_single_step(s->c_cpu, sstep_flags);
1937                 }
1938                 s->signal = res_signal;
1939                 gdb_continue(s);
1940                 return RS_IDLE;
1941             }
1942             break;
1943         } else {
1944             goto unknown_command;
1945         }
1946     case 'k':
1947         /* Kill the target */
1948         fprintf(stderr, "\nQEMU: Terminated via GDBstub\n");
1949         exit(0);
1950     case 'D':
1951         /* Detach packet */
1952         gdb_breakpoint_remove_all();
1953         gdb_syscall_mode = GDB_SYS_DISABLED;
1954         gdb_continue(s);
1955         put_packet(s, "OK");
1956         break;
1957     case 's':
1958         if (*p != '\0') {
1959             addr = strtoull(p, (char **)&p, 16);
1960             gdb_set_cpu_pc(s, addr);
1961         }
1962         cpu_single_step(s->c_cpu, sstep_flags);
1963         gdb_continue(s);
1964         return RS_IDLE;
1965     case 'F':
1966         {
1967             target_ulong ret;
1968             target_ulong err;
1969
1970             ret = strtoull(p, (char **)&p, 16);
1971             if (*p == ',') {
1972                 p++;
1973                 err = strtoull(p, (char **)&p, 16);
1974             } else {
1975                 err = 0;
1976             }
1977             if (*p == ',')
1978                 p++;
1979             type = *p;
1980             if (gdb_current_syscall_cb)
1981                 gdb_current_syscall_cb(s->c_cpu, ret, err);
1982             if (type == 'C') {
1983                 put_packet(s, "T02");
1984             } else {
1985                 gdb_continue(s);
1986             }
1987         }
1988         break;
1989     case 'g':
1990         cpu_synchronize_state(s->g_cpu);
1991         len = 0;
1992         for (addr = 0; addr < num_g_regs; addr++) {
1993             reg_size = gdb_read_register(s->g_cpu, mem_buf + len, addr);
1994             len += reg_size;
1995         }
1996         memtohex(buf, mem_buf, len);
1997         put_packet(s, buf);
1998         break;
1999     case 'G':
2000         cpu_synchronize_state(s->g_cpu);
2001         registers = mem_buf;
2002         len = strlen(p) / 2;
2003         hextomem((uint8_t *)registers, p, len);
2004         for (addr = 0; addr < num_g_regs && len > 0; addr++) {
2005             reg_size = gdb_write_register(s->g_cpu, registers, addr);
2006             len -= reg_size;
2007             registers += reg_size;
2008         }
2009         put_packet(s, "OK");
2010         break;
2011     case 'm':
2012         addr = strtoull(p, (char **)&p, 16);
2013         if (*p == ',')
2014             p++;
2015         len = strtoull(p, NULL, 16);
2016         if (cpu_memory_rw_debug(s->g_cpu, addr, mem_buf, len, 0) != 0) {
2017             put_packet (s, "E14");
2018         } else {
2019             memtohex(buf, mem_buf, len);
2020             put_packet(s, buf);
2021         }
2022         break;
2023     case 'M':
2024         addr = strtoull(p, (char **)&p, 16);
2025         if (*p == ',')
2026             p++;
2027         len = strtoull(p, (char **)&p, 16);
2028         if (*p == ':')
2029             p++;
2030         hextomem(mem_buf, p, len);
2031         if (cpu_memory_rw_debug(s->g_cpu, addr, mem_buf, len, 1) != 0)
2032             put_packet(s, "E14");
2033         else
2034             put_packet(s, "OK");
2035         break;
2036     case 'p':
2037         /* Older gdb are really dumb, and don't use 'g' if 'p' is avaialable.
2038            This works, but can be very slow.  Anything new enough to
2039            understand XML also knows how to use this properly.  */
2040         if (!gdb_has_xml)
2041             goto unknown_command;
2042         addr = strtoull(p, (char **)&p, 16);
2043         reg_size = gdb_read_register(s->g_cpu, mem_buf, addr);
2044         if (reg_size) {
2045             memtohex(buf, mem_buf, reg_size);
2046             put_packet(s, buf);
2047         } else {
2048             put_packet(s, "E14");
2049         }
2050         break;
2051     case 'P':
2052         if (!gdb_has_xml)
2053             goto unknown_command;
2054         addr = strtoull(p, (char **)&p, 16);
2055         if (*p == '=')
2056             p++;
2057         reg_size = strlen(p) / 2;
2058         hextomem(mem_buf, p, reg_size);
2059         gdb_write_register(s->g_cpu, mem_buf, addr);
2060         put_packet(s, "OK");
2061         break;
2062     case 'Z':
2063     case 'z':
2064         type = strtoul(p, (char **)&p, 16);
2065         if (*p == ',')
2066             p++;
2067         addr = strtoull(p, (char **)&p, 16);
2068         if (*p == ',')
2069             p++;
2070         len = strtoull(p, (char **)&p, 16);
2071         if (ch == 'Z')
2072             res = gdb_breakpoint_insert(addr, len, type);
2073         else
2074             res = gdb_breakpoint_remove(addr, len, type);
2075         if (res >= 0)
2076              put_packet(s, "OK");
2077         else if (res == -ENOSYS)
2078             put_packet(s, "");
2079         else
2080             put_packet(s, "E22");
2081         break;
2082     case 'H':
2083         type = *p++;
2084         thread = strtoull(p, (char **)&p, 16);
2085         if (thread == -1 || thread == 0) {
2086             put_packet(s, "OK");
2087             break;
2088         }
2089         env = find_cpu(thread);
2090         if (env == NULL) {
2091             put_packet(s, "E22");
2092             break;
2093         }
2094         switch (type) {
2095         case 'c':
2096             s->c_cpu = env;
2097             put_packet(s, "OK");
2098             break;
2099         case 'g':
2100             s->g_cpu = env;
2101             put_packet(s, "OK");
2102             break;
2103         default:
2104              put_packet(s, "E22");
2105              break;
2106         }
2107         break;
2108     case 'T':
2109         thread = strtoull(p, (char **)&p, 16);
2110         env = find_cpu(thread);
2111
2112         if (env != NULL) {
2113             put_packet(s, "OK");
2114         } else {
2115             put_packet(s, "E22");
2116         }
2117         break;
2118     case 'q':
2119     case 'Q':
2120         /* parse any 'q' packets here */
2121         if (!strcmp(p,"qemu.sstepbits")) {
2122             /* Query Breakpoint bit definitions */
2123             snprintf(buf, sizeof(buf), "ENABLE=%x,NOIRQ=%x,NOTIMER=%x",
2124                      SSTEP_ENABLE,
2125                      SSTEP_NOIRQ,
2126                      SSTEP_NOTIMER);
2127             put_packet(s, buf);
2128             break;
2129         } else if (strncmp(p,"qemu.sstep",10) == 0) {
2130             /* Display or change the sstep_flags */
2131             p += 10;
2132             if (*p != '=') {
2133                 /* Display current setting */
2134                 snprintf(buf, sizeof(buf), "0x%x", sstep_flags);
2135                 put_packet(s, buf);
2136                 break;
2137             }
2138             p++;
2139             type = strtoul(p, (char **)&p, 16);
2140             sstep_flags = type;
2141             put_packet(s, "OK");
2142             break;
2143         } else if (strcmp(p,"C") == 0) {
2144             /* "Current thread" remains vague in the spec, so always return
2145              *  the first CPU (gdb returns the first thread). */
2146             put_packet(s, "QC1");
2147             break;
2148         } else if (strcmp(p,"fThreadInfo") == 0) {
2149             s->query_cpu = first_cpu;
2150             goto report_cpuinfo;
2151         } else if (strcmp(p,"sThreadInfo") == 0) {
2152         report_cpuinfo:
2153             if (s->query_cpu) {
2154                 snprintf(buf, sizeof(buf), "m%x", gdb_id(s->query_cpu));
2155                 put_packet(s, buf);
2156                 s->query_cpu = s->query_cpu->next_cpu;
2157             } else
2158                 put_packet(s, "l");
2159             break;
2160         } else if (strncmp(p,"ThreadExtraInfo,", 16) == 0) {
2161             thread = strtoull(p+16, (char **)&p, 16);
2162             env = find_cpu(thread);
2163             if (env != NULL) {
2164                 cpu_synchronize_state(env);
2165                 len = snprintf((char *)mem_buf, sizeof(mem_buf),
2166                                "CPU#%d [%s]", env->cpu_index,
2167                                env->halted ? "halted " : "running");
2168                 memtohex(buf, mem_buf, len);
2169                 put_packet(s, buf);
2170             }
2171             break;
2172         }
2173 #ifdef CONFIG_USER_ONLY
2174         else if (strncmp(p, "Offsets", 7) == 0) {
2175             TaskState *ts = s->c_cpu->opaque;
2176
2177             snprintf(buf, sizeof(buf),
2178                      "Text=" TARGET_ABI_FMT_lx ";Data=" TARGET_ABI_FMT_lx
2179                      ";Bss=" TARGET_ABI_FMT_lx,
2180                      ts->info->code_offset,
2181                      ts->info->data_offset,
2182                      ts->info->data_offset);
2183             put_packet(s, buf);
2184             break;
2185         }
2186 #else /* !CONFIG_USER_ONLY */
2187         else if (strncmp(p, "Rcmd,", 5) == 0) {
2188             int len = strlen(p + 5);
2189
2190             if ((len % 2) != 0) {
2191                 put_packet(s, "E01");
2192                 break;
2193             }
2194             hextomem(mem_buf, p + 5, len);
2195             len = len / 2;
2196             mem_buf[len++] = 0;
2197             qemu_chr_be_write(s->mon_chr, mem_buf, len);
2198             put_packet(s, "OK");
2199             break;
2200         }
2201 #endif /* !CONFIG_USER_ONLY */
2202         if (strncmp(p, "Supported", 9) == 0) {
2203             snprintf(buf, sizeof(buf), "PacketSize=%x", MAX_PACKET_LENGTH);
2204 #ifdef GDB_CORE_XML
2205             pstrcat(buf, sizeof(buf), ";qXfer:features:read+");
2206 #endif
2207             put_packet(s, buf);
2208             break;
2209         }
2210 #ifdef GDB_CORE_XML
2211         if (strncmp(p, "Xfer:features:read:", 19) == 0) {
2212             const char *xml;
2213             target_ulong total_len;
2214
2215             gdb_has_xml = 1;
2216             p += 19;
2217             xml = get_feature_xml(p, &p);
2218             if (!xml) {
2219                 snprintf(buf, sizeof(buf), "E00");
2220                 put_packet(s, buf);
2221                 break;
2222             }
2223
2224             if (*p == ':')
2225                 p++;
2226             addr = strtoul(p, (char **)&p, 16);
2227             if (*p == ',')
2228                 p++;
2229             len = strtoul(p, (char **)&p, 16);
2230
2231             total_len = strlen(xml);
2232             if (addr > total_len) {
2233                 snprintf(buf, sizeof(buf), "E00");
2234                 put_packet(s, buf);
2235                 break;
2236             }
2237             if (len > (MAX_PACKET_LENGTH - 5) / 2)
2238                 len = (MAX_PACKET_LENGTH - 5) / 2;
2239             if (len < total_len - addr) {
2240                 buf[0] = 'm';
2241                 len = memtox(buf + 1, xml + addr, len);
2242             } else {
2243                 buf[0] = 'l';
2244                 len = memtox(buf + 1, xml + addr, total_len - addr);
2245             }
2246             put_packet_binary(s, buf, len + 1);
2247             break;
2248         }
2249 #endif
2250         /* Unrecognised 'q' command.  */
2251         goto unknown_command;
2252
2253     default:
2254     unknown_command:
2255         /* put empty packet */
2256         buf[0] = '\0';
2257         put_packet(s, buf);
2258         break;
2259     }
2260     return RS_IDLE;
2261 }
2262
2263 void gdb_set_stop_cpu(CPUState *env)
2264 {
2265     gdbserver_state->c_cpu = env;
2266     gdbserver_state->g_cpu = env;
2267 }
2268
2269 #ifndef CONFIG_USER_ONLY
2270 static void gdb_vm_state_change(void *opaque, int running, int reason)
2271 {
2272     GDBState *s = gdbserver_state;
2273     CPUState *env = s->c_cpu;
2274     char buf[256];
2275     const char *type;
2276     int ret;
2277
2278     if (running || s->state == RS_INACTIVE || s->state == RS_SYSCALL) {
2279         return;
2280     }
2281     switch (reason) {
2282     case VMSTOP_DEBUG:
2283         if (env->watchpoint_hit) {
2284             switch (env->watchpoint_hit->flags & BP_MEM_ACCESS) {
2285             case BP_MEM_READ:
2286                 type = "r";
2287                 break;
2288             case BP_MEM_ACCESS:
2289                 type = "a";
2290                 break;
2291             default:
2292                 type = "";
2293                 break;
2294             }
2295             snprintf(buf, sizeof(buf),
2296                      "T%02xthread:%02x;%swatch:" TARGET_FMT_lx ";",
2297                      GDB_SIGNAL_TRAP, gdb_id(env), type,
2298                      env->watchpoint_hit->vaddr);
2299             env->watchpoint_hit = NULL;
2300             goto send_packet;
2301         }
2302         tb_flush(env);
2303         ret = GDB_SIGNAL_TRAP;
2304         break;
2305     case VMSTOP_USER:
2306         ret = GDB_SIGNAL_INT;
2307         break;
2308     case VMSTOP_SHUTDOWN:
2309         ret = GDB_SIGNAL_QUIT;
2310         break;
2311     case VMSTOP_DISKFULL:
2312         ret = GDB_SIGNAL_IO;
2313         break;
2314     case VMSTOP_WATCHDOG:
2315         ret = GDB_SIGNAL_ALRM;
2316         break;
2317     case VMSTOP_PANIC:
2318         ret = GDB_SIGNAL_ABRT;
2319         break;
2320     case VMSTOP_SAVEVM:
2321     case VMSTOP_LOADVM:
2322         return;
2323     case VMSTOP_MIGRATE:
2324         ret = GDB_SIGNAL_XCPU;
2325         break;
2326     default:
2327         ret = GDB_SIGNAL_UNKNOWN;
2328         break;
2329     }
2330     snprintf(buf, sizeof(buf), "T%02xthread:%02x;", ret, gdb_id(env));
2331
2332 send_packet:
2333     put_packet(s, buf);
2334
2335     /* disable single step if it was enabled */
2336     cpu_single_step(env, 0);
2337 }
2338 #endif
2339
2340 /* Send a gdb syscall request.
2341    This accepts limited printf-style format specifiers, specifically:
2342     %x  - target_ulong argument printed in hex.
2343     %lx - 64-bit argument printed in hex.
2344     %s  - string pointer (target_ulong) and length (int) pair.  */
2345 void gdb_do_syscall(gdb_syscall_complete_cb cb, const char *fmt, ...)
2346 {
2347     va_list va;
2348     char buf[256];
2349     char *p;
2350     target_ulong addr;
2351     uint64_t i64;
2352     GDBState *s;
2353
2354     s = gdbserver_state;
2355     if (!s)
2356         return;
2357     gdb_current_syscall_cb = cb;
2358     s->state = RS_SYSCALL;
2359 #ifndef CONFIG_USER_ONLY
2360     vm_stop(VMSTOP_DEBUG);
2361 #endif
2362     s->state = RS_IDLE;
2363     va_start(va, fmt);
2364     p = buf;
2365     *(p++) = 'F';
2366     while (*fmt) {
2367         if (*fmt == '%') {
2368             fmt++;
2369             switch (*fmt++) {
2370             case 'x':
2371                 addr = va_arg(va, target_ulong);
2372                 p += snprintf(p, &buf[sizeof(buf)] - p, TARGET_FMT_lx, addr);
2373                 break;
2374             case 'l':
2375                 if (*(fmt++) != 'x')
2376                     goto bad_format;
2377                 i64 = va_arg(va, uint64_t);
2378                 p += snprintf(p, &buf[sizeof(buf)] - p, "%" PRIx64, i64);
2379                 break;
2380             case 's':
2381                 addr = va_arg(va, target_ulong);
2382                 p += snprintf(p, &buf[sizeof(buf)] - p, TARGET_FMT_lx "/%x",
2383                               addr, va_arg(va, int));
2384                 break;
2385             default:
2386             bad_format:
2387                 fprintf(stderr, "gdbstub: Bad syscall format string '%s'\n",
2388                         fmt - 1);
2389                 break;
2390             }
2391         } else {
2392             *(p++) = *(fmt++);
2393         }
2394     }
2395     *p = 0;
2396     va_end(va);
2397     put_packet(s, buf);
2398 #ifdef CONFIG_USER_ONLY
2399     gdb_handlesig(s->c_cpu, 0);
2400 #else
2401     cpu_exit(s->c_cpu);
2402 #endif
2403 }
2404
2405 static void gdb_read_byte(GDBState *s, int ch)
2406 {
2407     int i, csum;
2408     uint8_t reply;
2409
2410 #ifndef CONFIG_USER_ONLY
2411     if (s->last_packet_len) {
2412         /* Waiting for a response to the last packet.  If we see the start
2413            of a new command then abandon the previous response.  */
2414         if (ch == '-') {
2415 #ifdef DEBUG_GDB
2416             printf("Got NACK, retransmitting\n");
2417 #endif
2418             put_buffer(s, (uint8_t *)s->last_packet, s->last_packet_len);
2419         }
2420 #ifdef DEBUG_GDB
2421         else if (ch == '+')
2422             printf("Got ACK\n");
2423         else
2424             printf("Got '%c' when expecting ACK/NACK\n", ch);
2425 #endif
2426         if (ch == '+' || ch == '$')
2427             s->last_packet_len = 0;
2428         if (ch != '$')
2429             return;
2430     }
2431     if (vm_running) {
2432         /* when the CPU is running, we cannot do anything except stop
2433            it when receiving a char */
2434         vm_stop(VMSTOP_USER);
2435     } else
2436 #endif
2437     {
2438         switch(s->state) {
2439         case RS_IDLE:
2440             if (ch == '$') {
2441                 s->line_buf_index = 0;
2442                 s->state = RS_GETLINE;
2443             }
2444             break;
2445         case RS_GETLINE:
2446             if (ch == '#') {
2447             s->state = RS_CHKSUM1;
2448             } else if (s->line_buf_index >= sizeof(s->line_buf) - 1) {
2449                 s->state = RS_IDLE;
2450             } else {
2451             s->line_buf[s->line_buf_index++] = ch;
2452             }
2453             break;
2454         case RS_CHKSUM1:
2455             s->line_buf[s->line_buf_index] = '\0';
2456             s->line_csum = fromhex(ch) << 4;
2457             s->state = RS_CHKSUM2;
2458             break;
2459         case RS_CHKSUM2:
2460             s->line_csum |= fromhex(ch);
2461             csum = 0;
2462             for(i = 0; i < s->line_buf_index; i++) {
2463                 csum += s->line_buf[i];
2464             }
2465             if (s->line_csum != (csum & 0xff)) {
2466                 reply = '-';
2467                 put_buffer(s, &reply, 1);
2468                 s->state = RS_IDLE;
2469             } else {
2470                 reply = '+';
2471                 put_buffer(s, &reply, 1);
2472                 s->state = gdb_handle_packet(s, s->line_buf);
2473             }
2474             break;
2475         default:
2476             abort();
2477         }
2478     }
2479 }
2480
2481 /* Tell the remote gdb that the process has exited.  */
2482 void gdb_exit(CPUState *env, int code)
2483 {
2484   GDBState *s;
2485   char buf[4];
2486
2487   s = gdbserver_state;
2488   if (!s) {
2489       return;
2490   }
2491 #ifdef CONFIG_USER_ONLY
2492   if (gdbserver_fd < 0 || s->fd < 0) {
2493       return;
2494   }
2495 #endif
2496
2497   snprintf(buf, sizeof(buf), "W%02x", (uint8_t)code);
2498   put_packet(s, buf);
2499
2500 #ifndef CONFIG_USER_ONLY
2501   if (s->chr) {
2502       qemu_chr_fe_delete(s->chr);
2503   }
2504 #endif
2505 }
2506
2507 #ifdef CONFIG_USER_ONLY
2508 int
2509 gdb_queuesig (void)
2510 {
2511     GDBState *s;
2512
2513     s = gdbserver_state;
2514
2515     if (gdbserver_fd < 0 || s->fd < 0)
2516         return 0;
2517     else
2518         return 1;
2519 }
2520
2521 int
2522 gdb_handlesig (CPUState *env, int sig)
2523 {
2524   GDBState *s;
2525   char buf[256];
2526   int n;
2527
2528   s = gdbserver_state;
2529   if (gdbserver_fd < 0 || s->fd < 0)
2530     return sig;
2531
2532   /* disable single step if it was enabled */
2533   cpu_single_step(env, 0);
2534   tb_flush(env);
2535
2536   if (sig != 0)
2537     {
2538       snprintf(buf, sizeof(buf), "S%02x", target_signal_to_gdb (sig));
2539       put_packet(s, buf);
2540     }
2541   /* put_packet() might have detected that the peer terminated the
2542      connection.  */
2543   if (s->fd < 0)
2544       return sig;
2545
2546   sig = 0;
2547   s->state = RS_IDLE;
2548   s->running_state = 0;
2549   while (s->running_state == 0) {
2550       n = read (s->fd, buf, 256);
2551       if (n > 0)
2552         {
2553           int i;
2554
2555           for (i = 0; i < n; i++)
2556             gdb_read_byte (s, buf[i]);
2557         }
2558       else if (n == 0 || errno != EAGAIN)
2559         {
2560           /* XXX: Connection closed.  Should probably wait for annother
2561              connection before continuing.  */
2562           return sig;
2563         }
2564   }
2565   sig = s->signal;
2566   s->signal = 0;
2567   return sig;
2568 }
2569
2570 /* Tell the remote gdb that the process has exited due to SIG.  */
2571 void gdb_signalled(CPUState *env, int sig)
2572 {
2573   GDBState *s;
2574   char buf[4];
2575
2576   s = gdbserver_state;
2577   if (gdbserver_fd < 0 || s->fd < 0)
2578     return;
2579
2580   snprintf(buf, sizeof(buf), "X%02x", target_signal_to_gdb (sig));
2581   put_packet(s, buf);
2582 }
2583
2584 static void gdb_accept(void)
2585 {
2586     GDBState *s;
2587     struct sockaddr_in sockaddr;
2588     socklen_t len;
2589     int val, fd;
2590
2591     for(;;) {
2592         len = sizeof(sockaddr);
2593         fd = accept(gdbserver_fd, (struct sockaddr *)&sockaddr, &len);
2594         if (fd < 0 && errno != EINTR) {
2595             perror("accept");
2596             return;
2597         } else if (fd >= 0) {
2598 #ifndef _WIN32
2599             fcntl(fd, F_SETFD, FD_CLOEXEC);
2600 #endif
2601             break;
2602         }
2603     }
2604
2605     /* set short latency */
2606     val = 1;
2607     setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *)&val, sizeof(val));
2608
2609     s = qemu_mallocz(sizeof(GDBState));
2610     s->c_cpu = first_cpu;
2611     s->g_cpu = first_cpu;
2612     s->fd = fd;
2613     gdb_has_xml = 0;
2614
2615     gdbserver_state = s;
2616
2617     fcntl(fd, F_SETFL, O_NONBLOCK);
2618 }
2619
2620 static int gdbserver_open(int port)
2621 {
2622     struct sockaddr_in sockaddr;
2623     int fd, val, ret;
2624
2625     fd = socket(PF_INET, SOCK_STREAM, 0);
2626     if (fd < 0) {
2627         perror("socket");
2628         return -1;
2629     }
2630 #ifndef _WIN32
2631     fcntl(fd, F_SETFD, FD_CLOEXEC);
2632 #endif
2633
2634     /* allow fast reuse */
2635     val = 1;
2636     setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&val, sizeof(val));
2637
2638     sockaddr.sin_family = AF_INET;
2639     sockaddr.sin_port = htons(port);
2640     sockaddr.sin_addr.s_addr = 0;
2641     ret = bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr));
2642     if (ret < 0) {
2643         perror("bind");
2644         return -1;
2645     }
2646     ret = listen(fd, 0);
2647     if (ret < 0) {
2648         perror("listen");
2649         return -1;
2650     }
2651     return fd;
2652 }
2653
2654 int gdbserver_start(int port)
2655 {
2656     gdbserver_fd = gdbserver_open(port);
2657     if (gdbserver_fd < 0)
2658         return -1;
2659     /* accept connections */
2660     gdb_accept();
2661     return 0;
2662 }
2663
2664 /* Disable gdb stub for child processes.  */
2665 void gdbserver_fork(CPUState *env)
2666 {
2667     GDBState *s = gdbserver_state;
2668     if (gdbserver_fd < 0 || s->fd < 0)
2669       return;
2670     close(s->fd);
2671     s->fd = -1;
2672     cpu_breakpoint_remove_all(env, BP_GDB);
2673     cpu_watchpoint_remove_all(env, BP_GDB);
2674 }
2675 #else
2676 static void gdb_chr_receive(void *opaque)
2677 {
2678     uint8_t buf[MAX_PACKET_LENGTH];
2679     int size;
2680     int i;
2681
2682     size = qemu_chr_fe_read(gdbserver_state->chr, buf, sizeof(buf));
2683
2684     for (i = 0; i < size; i++) {
2685         gdb_read_byte(gdbserver_state, buf[i]);
2686     }
2687 }
2688
2689 static int gdb_chr_event(void *opaque, int event, void *data)
2690 {
2691     switch (event) {
2692     case CHR_EVENT_OPENED:
2693         vm_stop(VMSTOP_USER);
2694         gdb_has_xml = 0;
2695         break;
2696     default:
2697         break;
2698     }
2699
2700     return 0;
2701 }
2702
2703 static void gdb_monitor_output(GDBState *s, const char *msg, int len)
2704 {
2705     char buf[MAX_PACKET_LENGTH];
2706
2707     buf[0] = 'O';
2708     if (len > (MAX_PACKET_LENGTH/2) - 1)
2709         len = (MAX_PACKET_LENGTH/2) - 1;
2710     memtohex(buf + 1, (uint8_t *)msg, len);
2711     put_packet(s, buf);
2712 }
2713
2714 static int gdb_monitor_write(CharDriverState *chr, const uint8_t *buf, int len)
2715 {
2716     const char *p = (const char *)buf;
2717     int max_sz;
2718
2719     max_sz = (sizeof(gdbserver_state->last_packet) - 2) / 2;
2720     for (;;) {
2721         if (len <= max_sz) {
2722             gdb_monitor_output(gdbserver_state, p, len);
2723             break;
2724         }
2725         gdb_monitor_output(gdbserver_state, p, max_sz);
2726         p += max_sz;
2727         len -= max_sz;
2728     }
2729     return len;
2730 }
2731
2732 #ifndef _WIN32
2733 static void gdb_sigterm_handler(int signal)
2734 {
2735     if (vm_running) {
2736         vm_stop(VMSTOP_USER);
2737     }
2738 }
2739 #endif
2740
2741 int gdbserver_start(const char *device)
2742 {
2743     GDBState *s;
2744     char gdbstub_device_name[128];
2745     CharDriverState *chr = NULL;
2746     CharDriverState *mon_chr;
2747
2748     if (!device)
2749         return -1;
2750     if (strcmp(device, "none") != 0) {
2751         if (strstart(device, "tcp:", NULL)) {
2752             /* enforce required TCP attributes */
2753             snprintf(gdbstub_device_name, sizeof(gdbstub_device_name),
2754                      "%s,nowait,nodelay,server", device);
2755             device = gdbstub_device_name;
2756         }
2757 #ifndef _WIN32
2758         else if (strcmp(device, "stdio") == 0) {
2759             struct sigaction act;
2760
2761             memset(&act, 0, sizeof(act));
2762             act.sa_handler = gdb_sigterm_handler;
2763             sigaction(SIGINT, &act, NULL);
2764         }
2765 #endif
2766         chr = qemu_chr_new("gdb", device, NULL);
2767         if (!chr)
2768             return -1;
2769
2770         qemu_chr_fe_open(chr);
2771         qemu_chr_fe_set_handlers(chr, gdb_chr_receive, NULL,
2772                                  gdb_chr_event, NULL);
2773     }
2774
2775     s = gdbserver_state;
2776     if (!s) {
2777         s = qemu_mallocz(sizeof(GDBState));
2778         gdbserver_state = s;
2779
2780         qemu_add_vm_change_state_handler(gdb_vm_state_change, NULL);
2781
2782         /* Initialize a monitor terminal for gdb */
2783         mon_chr = qemu_mallocz(sizeof(*mon_chr));
2784         mon_chr->chr_write = gdb_monitor_write;
2785         monitor_init(mon_chr, 0);
2786     } else {
2787         if (s->chr)
2788             qemu_chr_fe_delete(s->chr);
2789         mon_chr = s->mon_chr;
2790         memset(s, 0, sizeof(GDBState));
2791     }
2792     s->c_cpu = first_cpu;
2793     s->g_cpu = first_cpu;
2794     s->chr = chr;
2795     s->state = chr ? RS_IDLE : RS_INACTIVE;
2796     s->mon_chr = mon_chr;
2797
2798     return 0;
2799 }
2800 #endif