qemu/gdbstub.c

   1 /*
   2  * gdb server stub
   3  *
   4  * Copyright (c) 2003-2005 Fabrice Bellard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20 #include "config.h"
  21 #ifdef CONFIG_USER_ONLY
  22 #include <stdlib.h>
  23 #include <stdio.h>
  24 #include <stdarg.h>
  25 #include <string.h>
  26 #include <errno.h>
  27 #include <unistd.h>
  28 #include <fcntl.h>
  29
  30 #include "qemu.h"
  31 #else
  32 #include "vl.h"
  33 #include "qemu-kvm.h"
  34 #endif
  35
  36 #include "qemu_socket.h"
  37 #ifdef _WIN32
  38 /* XXX: these constants may be independent of the host ones even for Unix */
  39 #ifndef SIGTRAP
  40 #define SIGTRAP 5
  41 #endif
  42 #ifndef SIGINT
  43 #define SIGINT 2
  44 #endif
  45 #else
  46 #include <signal.h>
  47 #endif
  48
  49 //#define DEBUG_GDB
  50
  51 enum RSState {
  52     RS_IDLE,
  53     RS_GETLINE,
  54     RS_CHKSUM1,
  55     RS_CHKSUM2,
  56     RS_SYSCALL,
  57 };
  58 typedef struct GDBState {
  59     CPUState *env; /* current CPU */
  60     enum RSState state; /* parsing state */
  61     char line_buf[4096];
  62     int line_buf_index;
  63     int line_csum;
  64     char last_packet[4100];
  65     int last_packet_len;
  66 #ifdef CONFIG_USER_ONLY
  67     int fd;
  68     int running_state;
  69 #else
  70     CharDriverState *chr;
  71 #endif
  72 } GDBState;
  73
  74 #ifdef CONFIG_USER_ONLY
  75 /* XXX: This is not thread safe.  Do we care?  */
  76 static int gdbserver_fd = -1;
  77
  78 /* XXX: remove this hack.  */
  79 static GDBState gdbserver_state;
  80
  81 static int get_char(GDBState *s)
  82 {
  83     uint8_t ch;
  84     int ret;
  85
  86     for(;;) {
  87         ret = recv(s->fd, &ch, 1, 0);
  88         if (ret < 0) {
  89             if (errno != EINTR && errno != EAGAIN)
  90                 return -1;
  91         } else if (ret == 0) {
  92             return -1;
  93         } else {
  94             break;
  95         }
  96     }
  97     return ch;
  98 }
  99 #endif
 100
 101 /* GDB stub state for use by semihosting syscalls.  */
 102 static GDBState *gdb_syscall_state;
 103 static gdb_syscall_complete_cb gdb_current_syscall_cb;
 104
 105 enum {
 106     GDB_SYS_UNKNOWN,
 107     GDB_SYS_ENABLED,
 108     GDB_SYS_DISABLED,
 109 } gdb_syscall_mode;
 110
 111 /* If gdb is connected when the first semihosting syscall occurs then use
 112    remote gdb syscalls.  Otherwise use native file IO.  */
 113 int use_gdb_syscalls(void)
 114 {
 115     if (gdb_syscall_mode == GDB_SYS_UNKNOWN) {
 116         gdb_syscall_mode = (gdb_syscall_state ? GDB_SYS_ENABLED
 117                                               : GDB_SYS_DISABLED);
 118     }
 119     return gdb_syscall_mode == GDB_SYS_ENABLED;
 120 }
 121
 122 static void put_buffer(GDBState *s, const uint8_t *buf, int len)
 123 {
 124 #ifdef CONFIG_USER_ONLY
 125     int ret;
 126
 127     while (len > 0) {
 128         ret = send(s->fd, buf, len, 0);
 129         if (ret < 0) {
 130             if (errno != EINTR && errno != EAGAIN)
 131                 return;
 132         } else {
 133             buf += ret;
 134             len -= ret;
 135         }
 136     }
 137 #else
 138     qemu_chr_write(s->chr, buf, len);
 139 #endif
 140 }
 141
 142 static inline int fromhex(int v)
 143 {
 144     if (v >= '0' && v <= '9')
 145         return v - '0';
 146     else if (v >= 'A' && v <= 'F')
 147         return v - 'A' + 10;
 148     else if (v >= 'a' && v <= 'f')
 149         return v - 'a' + 10;
 150     else
 151         return 0;
 152 }
 153
 154 static inline int tohex(int v)
 155 {
 156     if (v < 10)
 157         return v + '0';
 158     else
 159         return v - 10 + 'a';
 160 }
 161
 162 static void memtohex(char *buf, const uint8_t *mem, int len)
 163 {
 164     int i, c;
 165     char *q;
 166     q = buf;
 167     for(i = 0; i < len; i++) {
 168         c = mem[i];
 169         *q++ = tohex(c >> 4);
 170         *q++ = tohex(c & 0xf);
 171     }
 172     *q = '\0';
 173 }
 174
 175 static void hextomem(uint8_t *mem, const char *buf, int len)
 176 {
 177     int i;
 178
 179     for(i = 0; i < len; i++) {
 180         mem[i] = (fromhex(buf[0]) << 4) | fromhex(buf[1]);
 181         buf += 2;
 182     }
 183 }
 184
 185 /* return -1 if error, 0 if OK */
 186 static int put_packet(GDBState *s, char *buf)
 187 {
 188     int len, csum, i;
 189     char *p;
 190
 191 #ifdef DEBUG_GDB
 192     printf("reply='%s'\n", buf);
 193 #endif
 194
 195     for(;;) {
 196         p = s->last_packet;
 197         *(p++) = '$';
 198         len = strlen(buf);
 199         memcpy(p, buf, len);
 200         p += len;
 201         csum = 0;
 202         for(i = 0; i < len; i++) {
 203             csum += buf[i];
 204         }
 205         *(p++) = '#';
 206         *(p++) = tohex((csum >> 4) & 0xf);
 207         *(p++) = tohex((csum) & 0xf);
 208
 209         s->last_packet_len = p - s->last_packet;
 210         put_buffer(s, s->last_packet, s->last_packet_len);
 211
 212 #ifdef CONFIG_USER_ONLY
 213         i = get_char(s);
 214         if (i < 0)
 215             return -1;
 216         if (i == '+')
 217             break;
 218 #else
 219         break;
 220 #endif
 221     }
 222     return 0;
 223 }
 224
 225 #if defined(TARGET_X86_64)
 226
 227 static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
 228 {
 229     uint8_t *p = mem_buf;
 230     int i, fpus;
 231
 232 #define PUTREG(x) do { \
 233         target_ulong reg = tswapl(x); \
 234         memcpy(p, &reg, sizeof reg); \
 235         p += sizeof reg; \
 236     } while (0)
 237 #define PUTREG32(x) do { \
 238         uint32_t reg = tswap32(x);              \
 239         memcpy(p, &reg, sizeof reg); \
 240         p += sizeof reg; \
 241     } while (0)
 242 #define PUTREGF(x) do { \
 243         memcpy(p, &(x), 10);                    \
 244         p += sizeof (x);                        \
 245     } while (0)
 246
 247     PUTREG(env->regs[R_EAX]);
 248     PUTREG(env->regs[R_EBX]);
 249     PUTREG(env->regs[R_ECX]);
 250     PUTREG(env->regs[R_EDX]);
 251     PUTREG(env->regs[R_ESI]);
 252     PUTREG(env->regs[R_EDI]);
 253     PUTREG(env->regs[R_EBP]);
 254     PUTREG(env->regs[R_ESP]);
 255     PUTREG(env->regs[8]);
 256     PUTREG(env->regs[9]);
 257     PUTREG(env->regs[10]);
 258     PUTREG(env->regs[11]);
 259     PUTREG(env->regs[12]);
 260     PUTREG(env->regs[13]);
 261     PUTREG(env->regs[14]);
 262     PUTREG(env->regs[15]);
 263
 264     PUTREG(env->eip);
 265     PUTREG32(env->eflags);
 266     PUTREG32(env->segs[R_CS].selector);
 267     PUTREG32(env->segs[R_SS].selector);
 268     PUTREG32(env->segs[R_DS].selector);
 269     PUTREG32(env->segs[R_ES].selector);
 270     PUTREG32(env->segs[R_FS].selector);
 271     PUTREG32(env->segs[R_GS].selector);
 272     /* XXX: convert floats */
 273     for(i = 0; i < 8; i++) {
 274         PUTREGF(env->fpregs[i]);
 275     }
 276     PUTREG32(env->fpuc);
 277     fpus = (env->fpus & ~0x3800) | (env->fpstt & 0x7) << 11;
 278     PUTREG32(fpus);
 279     PUTREG32(0); /* XXX: convert tags */
 280     PUTREG32(0); /* fiseg */
 281     PUTREG32(0); /* fioff */
 282     PUTREG32(0); /* foseg */
 283     PUTREG32(0); /* fooff */
 284     PUTREG32(0); /* fop */
 285
 286 #undef PUTREG
 287 #undef PUTREG32
 288 #undef PUTREGF
 289
 290     return p - mem_buf;
 291 }
 292
 293 static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
 294 {
 295     uint8_t *p = mem_buf;
 296     uint32_t junk;
 297     int i, fpus;
 298
 299 #define GETREG(x) do { \
 300         target_ulong reg; \
 301         memcpy(&reg, p, sizeof reg);     \
 302         x = tswapl(reg);                 \
 303         p += sizeof reg;                 \
 304     } while (0)
 305 #define GETREG32(x) do { \
 306         uint32_t reg; \
 307         memcpy(&reg, p, sizeof reg);     \
 308         x = tswap32(reg);                \
 309         p += sizeof reg;                 \
 310     } while (0)
 311 #define GETREGF(x) do { \
 312         memcpy(&(x), p, 10);             \
 313         p += 10;                         \
 314     } while (0)
 315
 316     GETREG(env->regs[R_EAX]);
 317     GETREG(env->regs[R_EBX]);
 318     GETREG(env->regs[R_ECX]);
 319     GETREG(env->regs[R_EDX]);
 320     GETREG(env->regs[R_ESI]);
 321     GETREG(env->regs[R_EDI]);
 322     GETREG(env->regs[R_EBP]);
 323     GETREG(env->regs[R_ESP]);
 324     GETREG(env->regs[8]);
 325     GETREG(env->regs[9]);
 326     GETREG(env->regs[10]);
 327     GETREG(env->regs[11]);
 328     GETREG(env->regs[12]);
 329     GETREG(env->regs[13]);
 330     GETREG(env->regs[14]);
 331     GETREG(env->regs[15]);
 332
 333     GETREG(env->eip);
 334     GETREG32(env->eflags);
 335     GETREG32(env->segs[R_CS].selector);
 336     GETREG32(env->segs[R_SS].selector);
 337     GETREG32(env->segs[R_DS].selector);
 338     GETREG32(env->segs[R_ES].selector);
 339     GETREG32(env->segs[R_FS].selector);
 340     GETREG32(env->segs[R_GS].selector);
 341     /* XXX: convert floats */
 342     for(i = 0; i < 8; i++) {
 343         GETREGF(env->fpregs[i]);
 344     }
 345     GETREG32(env->fpuc);
 346     GETREG32(fpus); /* XXX: convert fpus */
 347     GETREG32(junk); /* XXX: convert tags */
 348     GETREG32(junk); /* fiseg */
 349     GETREG32(junk); /* fioff */
 350     GETREG32(junk); /* foseg */
 351     GETREG32(junk); /* fooff */
 352     GETREG32(junk); /* fop */
 353
 354 #undef GETREG
 355 #undef GETREG32
 356 #undef GETREGF
 357 }
 358
 359 #elif defined(TARGET_I386)
 360
 361 static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
 362 {
 363     uint32_t *registers = (uint32_t *)mem_buf;
 364     int i, fpus;
 365
 366     for(i = 0; i < 8; i++) {
 367         registers[i] = env->regs[i];
 368     }
 369     registers[8] = env->eip;
 370     registers[9] = env->eflags;
 371     registers[10] = env->segs[R_CS].selector;
 372     registers[11] = env->segs[R_SS].selector;
 373     registers[12] = env->segs[R_DS].selector;
 374     registers[13] = env->segs[R_ES].selector;
 375     registers[14] = env->segs[R_FS].selector;
 376     registers[15] = env->segs[R_GS].selector;
 377     /* XXX: convert floats */
 378     for(i = 0; i < 8; i++) {
 379         memcpy(mem_buf + 16 * 4 + i * 10, &env->fpregs[i], 10);
 380     }
 381     registers[36] = env->fpuc;
 382     fpus = (env->fpus & ~0x3800) | (env->fpstt & 0x7) << 11;
 383     registers[37] = fpus;
 384     registers[38] = 0; /* XXX: convert tags */
 385     registers[39] = 0; /* fiseg */
 386     registers[40] = 0; /* fioff */
 387     registers[41] = 0; /* foseg */
 388     registers[42] = 0; /* fooff */
 389     registers[43] = 0; /* fop */
 390
 391     for(i = 0; i < 16; i++)
 392         tswapls(&registers[i]);
 393     for(i = 36; i < 44; i++)
 394         tswapls(&registers[i]);
 395     return 44 * 4;
 396 }
 397
 398 static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
 399 {
 400     uint32_t *registers = (uint32_t *)mem_buf;
 401     int i;
 402
 403     for(i = 0; i < 8; i++) {
 404         env->regs[i] = tswapl(registers[i]);
 405     }
 406     env->eip = tswapl(registers[8]);
 407     env->eflags = tswapl(registers[9]);
 408 #if defined(CONFIG_USER_ONLY)
 409 #define LOAD_SEG(index, sreg)\
 410             if (tswapl(registers[index]) != env->segs[sreg].selector)\
 411                 cpu_x86_load_seg(env, sreg, tswapl(registers[index]));
 412             LOAD_SEG(10, R_CS);
 413             LOAD_SEG(11, R_SS);
 414             LOAD_SEG(12, R_DS);
 415             LOAD_SEG(13, R_ES);
 416             LOAD_SEG(14, R_FS);
 417             LOAD_SEG(15, R_GS);
 418 #endif
 419 }
 420
 421 #elif defined (TARGET_PPC)
 422 static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
 423 {
 424     uint32_t *registers = (uint32_t *)mem_buf, tmp;
 425     int i;
 426
 427     /* fill in gprs */
 428     for(i = 0; i < 32; i++) {
 429         registers[i] = tswapl(env->gpr[i]);
 430     }
 431     /* fill in fprs */
 432     for (i = 0; i < 32; i++) {
 433         registers[(i * 2) + 32] = tswapl(*((uint32_t *)&env->fpr[i]));
 434         registers[(i * 2) + 33] = tswapl(*((uint32_t *)&env->fpr[i] + 1));
 435     }
 436     /* nip, msr, ccr, lnk, ctr, xer, mq */
 437     registers[96] = tswapl(env->nip);
 438     registers[97] = tswapl(do_load_msr(env));
 439     tmp = 0;
 440     for (i = 0; i < 8; i++)
 441         tmp |= env->crf[i] << (32 - ((i + 1) * 4));
 442     registers[98] = tswapl(tmp);
 443     registers[99] = tswapl(env->lr);
 444     registers[100] = tswapl(env->ctr);
 445     registers[101] = tswapl(do_load_xer(env));
 446     registers[102] = 0;
 447
 448     return 103 * 4;
 449 }
 450
 451 static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
 452 {
 453     uint32_t *registers = (uint32_t *)mem_buf;
 454     int i;
 455
 456     /* fill in gprs */
 457     for (i = 0; i < 32; i++) {
 458         env->gpr[i] = tswapl(registers[i]);
 459     }
 460     /* fill in fprs */
 461     for (i = 0; i < 32; i++) {
 462         *((uint32_t *)&env->fpr[i]) = tswapl(registers[(i * 2) + 32]);
 463         *((uint32_t *)&env->fpr[i] + 1) = tswapl(registers[(i * 2) + 33]);
 464     }
 465     /* nip, msr, ccr, lnk, ctr, xer, mq */
 466     env->nip = tswapl(registers[96]);
 467     do_store_msr(env, tswapl(registers[97]));
 468     registers[98] = tswapl(registers[98]);
 469     for (i = 0; i < 8; i++)
 470         env->crf[i] = (registers[98] >> (32 - ((i + 1) * 4))) & 0xF;
 471     env->lr = tswapl(registers[99]);
 472     env->ctr = tswapl(registers[100]);
 473     do_store_xer(env, tswapl(registers[101]));
 474 }
 475 #elif defined (TARGET_SPARC)
 476 static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
 477 {
 478     target_ulong *registers = (target_ulong *)mem_buf;
 479     int i;
 480
 481     /* fill in g0..g7 */
 482     for(i = 0; i < 8; i++) {
 483         registers[i] = tswapl(env->gregs[i]);
 484     }
 485     /* fill in register window */
 486     for(i = 0; i < 24; i++) {
 487         registers[i + 8] = tswapl(env->regwptr[i]);
 488     }
 489 #ifndef TARGET_SPARC64
 490     /* fill in fprs */
 491     for (i = 0; i < 32; i++) {
 492         registers[i + 32] = tswapl(*((uint32_t *)&env->fpr[i]));
 493     }
 494     /* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */
 495     registers[64] = tswapl(env->y);
 496     {
 497         target_ulong tmp;
 498
 499         tmp = GET_PSR(env);
 500         registers[65] = tswapl(tmp);
 501     }
 502     registers[66] = tswapl(env->wim);
 503     registers[67] = tswapl(env->tbr);
 504     registers[68] = tswapl(env->pc);
 505     registers[69] = tswapl(env->npc);
 506     registers[70] = tswapl(env->fsr);
 507     registers[71] = 0; /* csr */
 508     registers[72] = 0;
 509     return 73 * sizeof(target_ulong);
 510 #else
 511     /* fill in fprs */
 512     for (i = 0; i < 64; i += 2) {
 513         uint64_t tmp;
 514
 515         tmp = (uint64_t)tswap32(*((uint32_t *)&env->fpr[i])) << 32;
 516         tmp |= tswap32(*((uint32_t *)&env->fpr[i + 1]));
 517         registers[i/2 + 32] = tmp;
 518     }
 519     registers[64] = tswapl(env->pc);
 520     registers[65] = tswapl(env->npc);
 521     registers[66] = tswapl(env->tstate[env->tl]);
 522     registers[67] = tswapl(env->fsr);
 523     registers[68] = tswapl(env->fprs);
 524     registers[69] = tswapl(env->y);
 525     return 70 * sizeof(target_ulong);
 526 #endif
 527 }
 528
 529 static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
 530 {
 531     target_ulong *registers = (target_ulong *)mem_buf;
 532     int i;
 533
 534     /* fill in g0..g7 */
 535     for(i = 0; i < 7; i++) {
 536         env->gregs[i] = tswapl(registers[i]);
 537     }
 538     /* fill in register window */
 539     for(i = 0; i < 24; i++) {
 540         env->regwptr[i] = tswapl(registers[i + 8]);
 541     }
 542 #ifndef TARGET_SPARC64
 543     /* fill in fprs */
 544     for (i = 0; i < 32; i++) {
 545         *((uint32_t *)&env->fpr[i]) = tswapl(registers[i + 32]);
 546     }
 547     /* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */
 548     env->y = tswapl(registers[64]);
 549     PUT_PSR(env, tswapl(registers[65]));
 550     env->wim = tswapl(registers[66]);
 551     env->tbr = tswapl(registers[67]);
 552     env->pc = tswapl(registers[68]);
 553     env->npc = tswapl(registers[69]);
 554     env->fsr = tswapl(registers[70]);
 555 #else
 556     for (i = 0; i < 64; i += 2) {
 557         *((uint32_t *)&env->fpr[i]) = tswap32(registers[i/2 + 32] >> 32);
 558         *((uint32_t *)&env->fpr[i + 1]) = tswap32(registers[i/2 + 32] & 0xffffffff);
 559     }
 560     env->pc = tswapl(registers[64]);
 561     env->npc = tswapl(registers[65]);
 562     env->tstate[env->tl] = tswapl(registers[66]);
 563     env->fsr = tswapl(registers[67]);
 564     env->fprs = tswapl(registers[68]);
 565     env->y = tswapl(registers[69]);
 566 #endif
 567 }
 568 #elif defined (TARGET_ARM)
 569 static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
 570 {
 571     int i;
 572     uint8_t *ptr;
 573
 574     ptr = mem_buf;
 575     /* 16 core integer registers (4 bytes each).  */
 576     for (i = 0; i < 16; i++)
 577       {
 578         *(uint32_t *)ptr = tswapl(env->regs[i]);
 579         ptr += 4;
 580       }
 581     /* 8 FPA registers (12 bytes each), FPS (4 bytes).
 582        Not yet implemented.  */
 583     memset (ptr, 0, 8 * 12 + 4);
 584     ptr += 8 * 12 + 4;
 585     /* CPSR (4 bytes).  */
 586     *(uint32_t *)ptr = tswapl (cpsr_read(env));
 587     ptr += 4;
 588
 589     return ptr - mem_buf;
 590 }
 591
 592 static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
 593 {
 594     int i;
 595     uint8_t *ptr;
 596
 597     ptr = mem_buf;
 598     /* Core integer registers.  */
 599     for (i = 0; i < 16; i++)
 600       {
 601         env->regs[i] = tswapl(*(uint32_t *)ptr);
 602         ptr += 4;
 603       }
 604     /* Ignore FPA regs and scr.  */
 605     ptr += 8 * 12 + 4;
 606     cpsr_write (env, tswapl(*(uint32_t *)ptr), 0xffffffff);
 607 }
 608 #elif defined (TARGET_M68K)
 609 static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
 610 {
 611     int i;
 612     uint8_t *ptr;
 613     CPU_DoubleU u;
 614
 615     ptr = mem_buf;
 616     /* D0-D7 */
 617     for (i = 0; i < 8; i++) {
 618         *(uint32_t *)ptr = tswapl(env->dregs[i]);
 619         ptr += 4;
 620     }
 621     /* A0-A7 */
 622     for (i = 0; i < 8; i++) {
 623         *(uint32_t *)ptr = tswapl(env->aregs[i]);
 624         ptr += 4;
 625     }
 626     *(uint32_t *)ptr = tswapl(env->sr);
 627     ptr += 4;
 628     *(uint32_t *)ptr = tswapl(env->pc);
 629     ptr += 4;
 630     /* F0-F7.  The 68881/68040 have 12-bit extended precision registers.
 631        ColdFire has 8-bit double precision registers.  */
 632     for (i = 0; i < 8; i++) {
 633         u.d = env->fregs[i];
 634         *(uint32_t *)ptr = tswap32(u.l.upper);
 635         *(uint32_t *)ptr = tswap32(u.l.lower);
 636     }
 637     /* FP control regs (not implemented).  */
 638     memset (ptr, 0, 3 * 4);
 639     ptr += 3 * 4;
 640
 641     return ptr - mem_buf;
 642 }
 643
 644 static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
 645 {
 646     int i;
 647     uint8_t *ptr;
 648     CPU_DoubleU u;
 649
 650     ptr = mem_buf;
 651     /* D0-D7 */
 652     for (i = 0; i < 8; i++) {
 653         env->dregs[i] = tswapl(*(uint32_t *)ptr);
 654         ptr += 4;
 655     }
 656     /* A0-A7 */
 657     for (i = 0; i < 8; i++) {
 658         env->aregs[i] = tswapl(*(uint32_t *)ptr);
 659         ptr += 4;
 660     }
 661     env->sr = tswapl(*(uint32_t *)ptr);
 662     ptr += 4;
 663     env->pc = tswapl(*(uint32_t *)ptr);
 664     ptr += 4;
 665     /* F0-F7.  The 68881/68040 have 12-bit extended precision registers.
 666        ColdFire has 8-bit double precision registers.  */
 667     for (i = 0; i < 8; i++) {
 668         u.l.upper = tswap32(*(uint32_t *)ptr);
 669         u.l.lower = tswap32(*(uint32_t *)ptr);
 670         env->fregs[i] = u.d;
 671     }
 672     /* FP control regs (not implemented).  */
 673     ptr += 3 * 4;
 674 }
 675 #elif defined (TARGET_MIPS)
 676 static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
 677 {
 678     int i;
 679     uint8_t *ptr;
 680
 681     ptr = mem_buf;
 682     for (i = 0; i < 32; i++)
 683       {
 684         *(uint32_t *)ptr = tswapl(env->gpr[i]);
 685         ptr += 4;
 686       }
 687
 688     *(uint32_t *)ptr = tswapl(env->CP0_Status);
 689     ptr += 4;
 690
 691     *(uint32_t *)ptr = tswapl(env->LO);
 692     ptr += 4;
 693
 694     *(uint32_t *)ptr = tswapl(env->HI);
 695     ptr += 4;
 696
 697     *(uint32_t *)ptr = tswapl(env->CP0_BadVAddr);
 698     ptr += 4;
 699
 700     *(uint32_t *)ptr = tswapl(env->CP0_Cause);
 701     ptr += 4;
 702
 703     *(uint32_t *)ptr = tswapl(env->PC);
 704     ptr += 4;
 705
 706 #ifdef MIPS_USES_FPU
 707     for (i = 0; i < 32; i++)
 708       {
 709         *(uint32_t *)ptr = tswapl(FPR_W (env, i));
 710         ptr += 4;
 711       }
 712
 713     *(uint32_t *)ptr = tswapl(env->fcr31);
 714     ptr += 4;
 715
 716     *(uint32_t *)ptr = tswapl(env->fcr0);
 717     ptr += 4;
 718 #endif
 719
 720     /* 32 FP registers, fsr, fir, fp.  Not yet implemented.  */
 721     /* what's 'fp' mean here?  */
 722
 723     return ptr - mem_buf;
 724 }
 725
 726 /* convert MIPS rounding mode in FCR31 to IEEE library */
 727 static unsigned int ieee_rm[] =
 728   {
 729     float_round_nearest_even,
 730     float_round_to_zero,
 731     float_round_up,
 732     float_round_down
 733   };
 734 #define RESTORE_ROUNDING_MODE \
 735     set_float_rounding_mode(ieee_rm[env->fcr31 & 3], &env->fp_status)
 736
 737 static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
 738 {
 739     int i;
 740     uint8_t *ptr;
 741
 742     ptr = mem_buf;
 743     for (i = 0; i < 32; i++)
 744       {
 745         env->gpr[i] = tswapl(*(uint32_t *)ptr);
 746         ptr += 4;
 747       }
 748
 749     env->CP0_Status = tswapl(*(uint32_t *)ptr);
 750     ptr += 4;
 751
 752     env->LO = tswapl(*(uint32_t *)ptr);
 753     ptr += 4;
 754
 755     env->HI = tswapl(*(uint32_t *)ptr);
 756     ptr += 4;
 757
 758     env->CP0_BadVAddr = tswapl(*(uint32_t *)ptr);
 759     ptr += 4;
 760
 761     env->CP0_Cause = tswapl(*(uint32_t *)ptr);
 762     ptr += 4;
 763
 764     env->PC = tswapl(*(uint32_t *)ptr);
 765     ptr += 4;
 766
 767 #ifdef MIPS_USES_FPU
 768     for (i = 0; i < 32; i++)
 769       {
 770         FPR_W (env, i) = tswapl(*(uint32_t *)ptr);
 771         ptr += 4;
 772       }
 773
 774     env->fcr31 = tswapl(*(uint32_t *)ptr) & 0x0183FFFF;
 775     ptr += 4;
 776
 777     env->fcr0 = tswapl(*(uint32_t *)ptr);
 778     ptr += 4;
 779
 780     /* set rounding mode */
 781     RESTORE_ROUNDING_MODE;
 782
 783 #ifndef CONFIG_SOFTFLOAT
 784     /* no floating point exception for native float */
 785     SET_FP_ENABLE(env->fcr31, 0);
 786 #endif
 787 #endif
 788 }
 789 #elif defined (TARGET_SH4)
 790 static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
 791 {
 792   uint32_t *ptr = (uint32_t *)mem_buf;
 793   int i;
 794
 795 #define SAVE(x) *ptr++=tswapl(x)
 796   if ((env->sr & (SR_MD | SR_RB)) == (SR_MD | SR_RB)) {
 797       for (i = 0; i < 8; i++) SAVE(env->gregs[i + 16]);
 798   } else {
 799       for (i = 0; i < 8; i++) SAVE(env->gregs[i]);
 800   }
 801   for (i = 8; i < 16; i++) SAVE(env->gregs[i]);
 802   SAVE (env->pc);
 803   SAVE (env->pr);
 804   SAVE (env->gbr);
 805   SAVE (env->vbr);
 806   SAVE (env->mach);
 807   SAVE (env->macl);
 808   SAVE (env->sr);
 809   SAVE (0); /* TICKS */
 810   SAVE (0); /* STALLS */
 811   SAVE (0); /* CYCLES */
 812   SAVE (0); /* INSTS */
 813   SAVE (0); /* PLR */
 814
 815   return ((uint8_t *)ptr - mem_buf);
 816 }
 817
 818 static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
 819 {
 820   uint32_t *ptr = (uint32_t *)mem_buf;
 821   int i;
 822
 823 #define LOAD(x) (x)=*ptr++;
 824   if ((env->sr & (SR_MD | SR_RB)) == (SR_MD | SR_RB)) {
 825       for (i = 0; i < 8; i++) LOAD(env->gregs[i + 16]);
 826   } else {
 827       for (i = 0; i < 8; i++) LOAD(env->gregs[i]);
 828   }
 829   for (i = 8; i < 16; i++) LOAD(env->gregs[i]);
 830   LOAD (env->pc);
 831   LOAD (env->pr);
 832   LOAD (env->gbr);
 833   LOAD (env->vbr);
 834   LOAD (env->mach);
 835   LOAD (env->macl);
 836   LOAD (env->sr);
 837 }
 838 #else
 839 static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
 840 {
 841     return 0;
 842 }
 843
 844 static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
 845 {
 846 }
 847
 848 #endif
 849
 850 static int gdb_handle_packet(GDBState *s, CPUState *env, const char *line_buf)
 851 {
 852     const char *p;
 853     int ch, reg_size, type;
 854     char buf[4096];
 855     uint8_t mem_buf[2000];
 856     uint32_t *registers;
 857     target_ulong addr, len;
 858
 859 #ifdef DEBUG_GDB
 860     printf("command='%s'\n", line_buf);
 861 #endif
 862     p = line_buf;
 863     ch = *p++;
 864     switch(ch) {
 865     case '?':
 866         /* TODO: Make this return the correct value for user-mode.  */
 867         snprintf(buf, sizeof(buf), "S%02x", SIGTRAP);
 868         put_packet(s, buf);
 869         break;
 870     case 'c':
 871         if (*p != '\0') {
 872             addr = strtoull(p, (char **)&p, 16);
 873 #if defined(TARGET_I386)
 874             env->eip = addr;
 875 #ifdef USE_KVM
 876             kvm_load_registers(env);
 877 #endif
 878 #elif defined (TARGET_PPC)
 879             env->nip = addr;
 880 #elif defined (TARGET_SPARC)
 881             env->pc = addr;
 882             env->npc = addr + 4;
 883 #elif defined (TARGET_ARM)
 884             env->regs[15] = addr;
 885 #elif defined (TARGET_SH4)
 886             env->pc = addr;
 887 #endif
 888         }
 889 #ifdef CONFIG_USER_ONLY
 890         s->running_state = 1;
 891 #else
 892         vm_start();
 893 #endif
 894         return RS_IDLE;
 895     case 's':
 896         if (*p != '\0') {
 897             addr = strtoul(p, (char **)&p, 16);
 898 #if defined(TARGET_I386)
 899             env->eip = addr;
 900 #ifdef USE_KVM
 901             kvm_load_registers(env);
 902 #endif
 903 #elif defined (TARGET_PPC)
 904             env->nip = addr;
 905 #elif defined (TARGET_SPARC)
 906             env->pc = addr;
 907             env->npc = addr + 4;
 908 #elif defined (TARGET_ARM)
 909             env->regs[15] = addr;
 910 #elif defined (TARGET_SH4)
 911             env->pc = addr;
 912 #endif
 913         }
 914         cpu_single_step(env, 1);
 915 #ifdef CONFIG_USER_ONLY
 916         s->running_state = 1;
 917 #else
 918         vm_start();
 919 #endif
 920         return RS_IDLE;
 921     case 'F':
 922         {
 923             target_ulong ret;
 924             target_ulong err;
 925
 926             ret = strtoull(p, (char **)&p, 16);
 927             if (*p == ',') {
 928                 p++;
 929                 err = strtoull(p, (char **)&p, 16);
 930             } else {
 931                 err = 0;
 932             }
 933             if (*p == ',')
 934                 p++;
 935             type = *p;
 936             if (gdb_current_syscall_cb)
 937                 gdb_current_syscall_cb(s->env, ret, err);
 938             if (type == 'C') {
 939                 put_packet(s, "T02");
 940             } else {
 941 #ifdef CONFIG_USER_ONLY
 942                 s->running_state = 1;
 943 #else
 944                 vm_start();
 945 #endif
 946             }
 947         }
 948         break;
 949     case 'g':
 950 #ifdef USE_KVM
 951         kvm_save_registers(env);
 952 #endif
 953         reg_size = cpu_gdb_read_registers(env, mem_buf);
 954         memtohex(buf, mem_buf, reg_size);
 955         put_packet(s, buf);
 956         break;
 957     case 'G':
 958         registers = (void *)mem_buf;
 959         len = strlen(p) / 2;
 960         hextomem((uint8_t *)registers, p, len);
 961         cpu_gdb_write_registers(env, mem_buf, len);
 962 #ifdef USE_KVM
 963         kvm_load_registers(env);
 964 #endif
 965         put_packet(s, "OK");
 966         break;
 967     case 'm':
 968         addr = strtoull(p, (char **)&p, 16);
 969         if (*p == ',')
 970             p++;
 971         len = strtoull(p, NULL, 16);
 972         if (cpu_memory_rw_debug(env, addr, mem_buf, len, 0) != 0) {
 973             put_packet (s, "E14");
 974         } else {
 975             memtohex(buf, mem_buf, len);
 976             put_packet(s, buf);
 977         }
 978         break;
 979     case 'M':
 980         addr = strtoull(p, (char **)&p, 16);
 981         if (*p == ',')
 982             p++;
 983         len = strtoull(p, (char **)&p, 16);
 984         if (*p == ':')
 985             p++;
 986         hextomem(mem_buf, p, len);
 987         if (cpu_memory_rw_debug(env, addr, mem_buf, len, 1) != 0)
 988             put_packet(s, "E14");
 989         else
 990             put_packet(s, "OK");
 991         break;
 992     case 'Z':
 993         type = strtoul(p, (char **)&p, 16);
 994         if (*p == ',')
 995             p++;
 996         addr = strtoull(p, (char **)&p, 16);
 997         if (*p == ',')
 998             p++;
 999         len = strtoull(p, (char **)&p, 16);
1000         if (type == 0 || type == 1) {
1001             if (cpu_breakpoint_insert(env, addr) < 0)
1002                 goto breakpoint_error;
1003             put_packet(s, "OK");
1004         } else {
1005         breakpoint_error:
1006             put_packet(s, "E22");
1007         }
1008         break;
1009     case 'z':
1010         type = strtoul(p, (char **)&p, 16);
1011         if (*p == ',')
1012             p++;
1013         addr = strtoull(p, (char **)&p, 16);
1014         if (*p == ',')
1015             p++;
1016         len = strtoull(p, (char **)&p, 16);
1017         if (type == 0 || type == 1) {
1018             cpu_breakpoint_remove(env, addr);
1019             put_packet(s, "OK");
1020         } else {
1021             goto breakpoint_error;
1022         }
1023         break;
1024 #ifdef CONFIG_LINUX_USER
1025     case 'q':
1026         if (strncmp(p, "Offsets", 7) == 0) {
1027             TaskState *ts = env->opaque;
1028
1029             sprintf(buf, "Text=%x;Data=%x;Bss=%x", ts->info->code_offset,
1030                 ts->info->data_offset, ts->info->data_offset);
1031             put_packet(s, buf);
1032             break;
1033         }
1034         /* Fall through.  */
1035 #endif
1036     default:
1037         //        unknown_command:
1038         /* put empty packet */
1039         buf[0] = '\0';
1040         put_packet(s, buf);
1041         break;
1042     }
1043     return RS_IDLE;
1044 }
1045
1046 extern void tb_flush(CPUState *env);
1047
1048 #ifndef CONFIG_USER_ONLY
1049 static void gdb_vm_stopped(void *opaque, int reason)
1050 {
1051     GDBState *s = opaque;
1052     char buf[256];
1053     int ret;
1054
1055     if (s->state == RS_SYSCALL)
1056         return;
1057
1058     /* disable single step if it was enable */
1059     cpu_single_step(s->env, 0);
1060
1061     if (reason == EXCP_DEBUG) {
1062         tb_flush(s->env);
1063         ret = SIGTRAP;
1064     } else if (reason == EXCP_INTERRUPT) {
1065         ret = SIGINT;
1066     } else {
1067         ret = 0;
1068     }
1069     snprintf(buf, sizeof(buf), "S%02x", ret);
1070     put_packet(s, buf);
1071 }
1072 #endif
1073
1074 /* Send a gdb syscall request.
1075    This accepts limited printf-style format specifiers, specifically:
1076     %x - target_ulong argument printed in hex.
1077     %s - string pointer (target_ulong) and length (int) pair.  */
1078 void gdb_do_syscall(gdb_syscall_complete_cb cb, char *fmt, ...)
1079 {
1080     va_list va;
1081     char buf[256];
1082     char *p;
1083     target_ulong addr;
1084     GDBState *s;
1085
1086     s = gdb_syscall_state;
1087     if (!s)
1088         return;
1089     gdb_current_syscall_cb = cb;
1090     s->state = RS_SYSCALL;
1091 #ifndef CONFIG_USER_ONLY
1092     vm_stop(EXCP_DEBUG);
1093 #endif
1094     s->state = RS_IDLE;
1095     va_start(va, fmt);
1096     p = buf;
1097     *(p++) = 'F';
1098     while (*fmt) {
1099         if (*fmt == '%') {
1100             fmt++;
1101             switch (*fmt++) {
1102             case 'x':
1103                 addr = va_arg(va, target_ulong);
1104                 p += sprintf(p, TARGET_FMT_lx, addr);
1105                 break;
1106             case 's':
1107                 addr = va_arg(va, target_ulong);
1108                 p += sprintf(p, TARGET_FMT_lx "/%x", addr, va_arg(va, int));
1109                 break;
1110             default:
1111                 fprintf(stderr, "gdbstub: Bad syscall format string '%s'\n",
1112                         fmt - 1);
1113                 break;
1114             }
1115         } else {
1116             *(p++) = *(fmt++);
1117         }
1118     }
1119     va_end(va);
1120     put_packet(s, buf);
1121 #ifdef CONFIG_USER_ONLY
1122     gdb_handlesig(s->env, 0);
1123 #else
1124     cpu_interrupt(s->env, CPU_INTERRUPT_EXIT);
1125 #endif
1126 }
1127
1128 static void gdb_read_byte(GDBState *s, int ch)
1129 {
1130     CPUState *env = s->env;
1131     int i, csum;
1132     char reply[1];
1133
1134 #ifndef CONFIG_USER_ONLY
1135     if (s->last_packet_len) {
1136         /* Waiting for a response to the last packet.  If we see the start
1137            of a new command then abandon the previous response.  */
1138         if (ch == '-') {
1139 #ifdef DEBUG_GDB
1140             printf("Got NACK, retransmitting\n");
1141 #endif
1142             put_buffer(s, s->last_packet, s->last_packet_len);
1143         }
1144 #ifdef DEBUG_GDB
1145         else if (ch == '+')
1146             printf("Got ACK\n");
1147         else
1148             printf("Got '%c' when expecting ACK/NACK\n", ch);
1149 #endif
1150         if (ch == '+' || ch == '$')
1151             s->last_packet_len = 0;
1152         if (ch != '$')
1153             return;
1154     }
1155     if (vm_running) {
1156         /* when the CPU is running, we cannot do anything except stop
1157            it when receiving a char */
1158         vm_stop(EXCP_INTERRUPT);
1159     } else
1160 #endif
1161     {
1162         switch(s->state) {
1163         case RS_IDLE:
1164             if (ch == '$') {
1165                 s->line_buf_index = 0;
1166                 s->state = RS_GETLINE;
1167             }
1168             break;
1169         case RS_GETLINE:
1170             if (ch == '#') {
1171             s->state = RS_CHKSUM1;
1172             } else if (s->line_buf_index >= sizeof(s->line_buf) - 1) {
1173                 s->state = RS_IDLE;
1174             } else {
1175             s->line_buf[s->line_buf_index++] = ch;
1176             }
1177             break;
1178         case RS_CHKSUM1:
1179             s->line_buf[s->line_buf_index] = '\0';
1180             s->line_csum = fromhex(ch) << 4;
1181             s->state = RS_CHKSUM2;
1182             break;
1183         case RS_CHKSUM2:
1184             s->line_csum |= fromhex(ch);
1185             csum = 0;
1186             for(i = 0; i < s->line_buf_index; i++) {
1187                 csum += s->line_buf[i];
1188             }
1189             if (s->line_csum != (csum & 0xff)) {
1190                 reply[0] = '-';
1191                 put_buffer(s, reply, 1);
1192                 s->state = RS_IDLE;
1193             } else {
1194                 reply[0] = '+';
1195                 put_buffer(s, reply, 1);
1196                 s->state = gdb_handle_packet(s, env, s->line_buf);
1197             }
1198             break;
1199         default:
1200             abort();
1201         }
1202     }
1203 }
1204
1205 #ifdef CONFIG_USER_ONLY
1206 int
1207 gdb_handlesig (CPUState *env, int sig)
1208 {
1209   GDBState *s;
1210   char buf[256];
1211   int n;
1212
1213   if (gdbserver_fd < 0)
1214     return sig;
1215
1216   s = &gdbserver_state;
1217
1218   /* disable single step if it was enabled */
1219   cpu_single_step(env, 0);
1220   tb_flush(env);
1221
1222   if (sig != 0)
1223     {
1224       snprintf(buf, sizeof(buf), "S%02x", sig);
1225       put_packet(s, buf);
1226     }
1227
1228   sig = 0;
1229   s->state = RS_IDLE;
1230   s->running_state = 0;
1231   while (s->running_state == 0) {
1232       n = read (s->fd, buf, 256);
1233       if (n > 0)
1234         {
1235           int i;
1236
1237           for (i = 0; i < n; i++)
1238             gdb_read_byte (s, buf[i]);
1239         }
1240       else if (n == 0 || errno != EAGAIN)
1241         {
1242           /* XXX: Connection closed.  Should probably wait for annother
1243              connection before continuing.  */
1244           return sig;
1245         }
1246   }
1247   return sig;
1248 }
1249
1250 /* Tell the remote gdb that the process has exited.  */
1251 void gdb_exit(CPUState *env, int code)
1252 {
1253   GDBState *s;
1254   char buf[4];
1255
1256   if (gdbserver_fd < 0)
1257     return;
1258
1259   s = &gdbserver_state;
1260
1261   snprintf(buf, sizeof(buf), "W%02x", code);
1262   put_packet(s, buf);
1263 }
1264
1265
1266 static void gdb_accept(void *opaque)
1267 {
1268     GDBState *s;
1269     struct sockaddr_in sockaddr;
1270     socklen_t len;
1271     int val, fd;
1272
1273     for(;;) {
1274         len = sizeof(sockaddr);
1275         fd = accept(gdbserver_fd, (struct sockaddr *)&sockaddr, &len);
1276         if (fd < 0 && errno != EINTR) {
1277             perror("accept");
1278             return;
1279         } else if (fd >= 0) {
1280             break;
1281         }
1282     }
1283
1284     /* set short latency */
1285     val = 1;
1286     setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *)&val, sizeof(val));
1287
1288     s = &gdbserver_state;
1289     memset (s, 0, sizeof (GDBState));
1290     s->env = first_cpu; /* XXX: allow to change CPU */
1291     s->fd = fd;
1292
1293     gdb_syscall_state = s;
1294
1295     fcntl(fd, F_SETFL, O_NONBLOCK);
1296 }
1297
1298 static int gdbserver_open(int port)
1299 {
1300     struct sockaddr_in sockaddr;
1301     int fd, val, ret;
1302
1303     fd = socket(PF_INET, SOCK_STREAM, 0);
1304     if (fd < 0) {
1305         perror("socket");
1306         return -1;
1307     }
1308
1309     /* allow fast reuse */
1310     val = 1;
1311     setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&val, sizeof(val));
1312
1313     sockaddr.sin_family = AF_INET;
1314     sockaddr.sin_port = htons(port);
1315     sockaddr.sin_addr.s_addr = 0;
1316     ret = bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr));
1317     if (ret < 0) {
1318         perror("bind");
1319         return -1;
1320     }
1321     ret = listen(fd, 0);
1322     if (ret < 0) {
1323         perror("listen");
1324         return -1;
1325     }
1326     return fd;
1327 }
1328
1329 int gdbserver_start(int port)
1330 {
1331     gdbserver_fd = gdbserver_open(port);
1332     if (gdbserver_fd < 0)
1333         return -1;
1334     /* accept connections */
1335     gdb_accept (NULL);
1336     return 0;
1337 }
1338 #else
1339 static int gdb_chr_can_recieve(void *opaque)
1340 {
1341   return 1;
1342 }
1343
1344 static void gdb_chr_recieve(void *opaque, const uint8_t *buf, int size)
1345 {
1346     GDBState *s = opaque;
1347     int i;
1348
1349     for (i = 0; i < size; i++) {
1350         gdb_read_byte(s, buf[i]);
1351     }
1352 }
1353
1354 static void gdb_chr_event(void *opaque, int event)
1355 {
1356     switch (event) {
1357     case CHR_EVENT_RESET:
1358         vm_stop(EXCP_INTERRUPT);
1359         gdb_syscall_state = opaque;
1360         break;
1361     default:
1362         break;
1363     }
1364 }
1365
1366 int gdbserver_start(CharDriverState *chr)
1367 {
1368     GDBState *s;
1369
1370     if (!chr)
1371         return -1;
1372
1373     s = qemu_mallocz(sizeof(GDBState));
1374     if (!s) {
1375         return -1;
1376     }
1377     s->env = first_cpu; /* XXX: allow to change CPU */
1378     s->chr = chr;
1379     qemu_chr_add_handlers(chr, gdb_chr_can_recieve, gdb_chr_recieve,
1380                           gdb_chr_event, s);
1381     qemu_add_vm_stop_handler(gdb_vm_stopped, s);
1382     return 0;
1383 }
1384
1385 int gdbserver_start_port(int port)
1386 {
1387     CharDriverState *chr;
1388     char gdbstub_port_name[128];
1389
1390     snprintf(gdbstub_port_name, sizeof(gdbstub_port_name),
1391              "tcp::%d,nowait,nodelay,server", port);
1392     chr = qemu_chr_open(gdbstub_port_name);
1393     if (!chr)
1394         return -EIO;
1395     return gdbserver_start(chr);
1396 }
1397
1398 #endif