gdb/lynx-nat.c

   1 /* Native-dependent code for LynxOS.
   2    Copyright 1993, 1994 Free Software Foundation, Inc.
   3
   4 This file is part of GDB.
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2 of the License, or
   9 (at your option) any later version.
  10
  11 This program 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
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program; if not, write to the Free Software
  18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 #include "defs.h"
  21 #include "frame.h"
  22 #include "inferior.h"
  23 #include "target.h"
  24
  25 #include <sys/ptrace.h>
  26 #include <sys/wait.h>
  27 #include <sys/fpp.h>
  28
  29 static unsigned long registers_addr PARAMS ((int pid));
  30
  31 #define X(ENTRY)(offsetof(struct econtext, ENTRY))
  32
  33 #ifdef I386
  34 /* Mappings from tm-i386v.h */
  35
  36 static int regmap[] =
  37 {
  38   X(eax),
  39   X(ecx),
  40   X(edx),
  41   X(ebx),
  42   X(esp),                       /* sp */
  43   X(ebp),                       /* fp */
  44   X(esi),
  45   X(edi),
  46   X(eip),                       /* pc */
  47   X(flags),                     /* ps */
  48   X(cs),
  49   X(ss),
  50   X(ds),
  51   X(es),
  52   X(ecode),                     /* Lynx doesn't give us either fs or gs, so */
  53   X(fault),                     /* we just substitute these two in the hopes
  54                                    that they are useful. */
  55 };
  56 #endif /* I386 */
  57
  58 #ifdef M68K
  59 /* Mappings from tm-m68k.h */
  60
  61 static int regmap[] =
  62 {
  63   X(regs[0]),                   /* d0 */
  64   X(regs[1]),                   /* d1 */
  65   X(regs[2]),                   /* d2 */
  66   X(regs[3]),                   /* d3 */
  67   X(regs[4]),                   /* d4 */
  68   X(regs[5]),                   /* d5 */
  69   X(regs[6]),                   /* d6 */
  70   X(regs[7]),                   /* d7 */
  71   X(regs[8]),                   /* a0 */
  72   X(regs[9]),                   /* a1 */
  73   X(regs[10]),                  /* a2 */
  74   X(regs[11]),                  /* a3 */
  75   X(regs[12]),                  /* a4 */
  76   X(regs[13]),                  /* a5 */
  77   X(regs[14]),                  /* fp */
  78   offsetof (st_t, usp) - offsetof (st_t, ec), /* sp */
  79   X(status),                    /* ps */
  80   X(pc),
  81
  82   X(fregs[0*3]),                /* fp0 */
  83   X(fregs[1*3]),                /* fp1 */
  84   X(fregs[2*3]),                /* fp2 */
  85   X(fregs[3*3]),                /* fp3 */
  86   X(fregs[4*3]),                /* fp4 */
  87   X(fregs[5*3]),                /* fp5 */
  88   X(fregs[6*3]),                /* fp6 */
  89   X(fregs[7*3]),                /* fp7 */
  90
  91   X(fcregs[0]),                 /* fpcontrol */
  92   X(fcregs[1]),                 /* fpstatus */
  93   X(fcregs[2]),                 /* fpiaddr */
  94   X(ssw),                       /* fpcode */
  95   X(fault),                     /* fpflags */
  96 };
  97 #endif /* M68K */
  98
  99 #ifdef SPARC
 100 /* Mappings from tm-sparc.h */
 101
 102 #define FX(ENTRY)(offsetof(struct fcontext, ENTRY))
 103
 104 static int regmap[] =
 105 {
 106   -1,                           /* g0 */
 107   X(g1),
 108   X(g2),
 109   X(g3),
 110   X(g4),
 111   -1,                           /* g5->g7 aren't saved by Lynx */
 112   -1,
 113   -1,
 114
 115   X(o[0]),
 116   X(o[1]),
 117   X(o[2]),
 118   X(o[3]),
 119   X(o[4]),
 120   X(o[5]),
 121   X(o[6]),                      /* sp */
 122   X(o[7]),                      /* ra */
 123
 124   -1,-1,-1,-1,-1,-1,-1,-1,      /* l0 -> l7 */
 125
 126   -1,-1,-1,-1,-1,-1,-1,-1,      /* i0 -> i7 */
 127
 128   FX(f.fregs[0]),               /* f0 */
 129   FX(f.fregs[1]),
 130   FX(f.fregs[2]),
 131   FX(f.fregs[3]),
 132   FX(f.fregs[4]),
 133   FX(f.fregs[5]),
 134   FX(f.fregs[6]),
 135   FX(f.fregs[7]),
 136   FX(f.fregs[8]),
 137   FX(f.fregs[9]),
 138   FX(f.fregs[10]),
 139   FX(f.fregs[11]),
 140   FX(f.fregs[12]),
 141   FX(f.fregs[13]),
 142   FX(f.fregs[14]),
 143   FX(f.fregs[15]),
 144   FX(f.fregs[16]),
 145   FX(f.fregs[17]),
 146   FX(f.fregs[18]),
 147   FX(f.fregs[19]),
 148   FX(f.fregs[20]),
 149   FX(f.fregs[21]),
 150   FX(f.fregs[22]),
 151   FX(f.fregs[23]),
 152   FX(f.fregs[24]),
 153   FX(f.fregs[25]),
 154   FX(f.fregs[26]),
 155   FX(f.fregs[27]),
 156   FX(f.fregs[28]),
 157   FX(f.fregs[29]),
 158   FX(f.fregs[30]),
 159   FX(f.fregs[31]),
 160
 161   X(y),
 162   X(psr),
 163   X(wim),
 164   X(tbr),
 165   X(pc),
 166   X(npc),
 167   FX(fsr),                      /* fpsr */
 168   -1,                           /* cpsr */
 169 };
 170 #endif /* SPARC */
 171
 172 #ifdef rs6000
 173
 174 static int regmap[] =
 175 {
 176   X(iregs[0]),                  /* r0 */
 177   X(iregs[1]),
 178   X(iregs[2]),
 179   X(iregs[3]),
 180   X(iregs[4]),
 181   X(iregs[5]),
 182   X(iregs[6]),
 183   X(iregs[7]),
 184   X(iregs[8]),
 185   X(iregs[9]),
 186   X(iregs[10]),
 187   X(iregs[11]),
 188   X(iregs[12]),
 189   X(iregs[13]),
 190   X(iregs[14]),
 191   X(iregs[15]),
 192   X(iregs[16]),
 193   X(iregs[17]),
 194   X(iregs[18]),
 195   X(iregs[19]),
 196   X(iregs[20]),
 197   X(iregs[21]),
 198   X(iregs[22]),
 199   X(iregs[23]),
 200   X(iregs[24]),
 201   X(iregs[25]),
 202   X(iregs[26]),
 203   X(iregs[27]),
 204   X(iregs[28]),
 205   X(iregs[29]),
 206   X(iregs[30]),
 207   X(iregs[31]),
 208
 209   X(fregs[0]),                  /* f0 */
 210   X(fregs[1]),
 211   X(fregs[2]),
 212   X(fregs[3]),
 213   X(fregs[4]),
 214   X(fregs[5]),
 215   X(fregs[6]),
 216   X(fregs[7]),
 217   X(fregs[8]),
 218   X(fregs[9]),
 219   X(fregs[10]),
 220   X(fregs[11]),
 221   X(fregs[12]),
 222   X(fregs[13]),
 223   X(fregs[14]),
 224   X(fregs[15]),
 225   X(fregs[16]),
 226   X(fregs[17]),
 227   X(fregs[18]),
 228   X(fregs[19]),
 229   X(fregs[20]),
 230   X(fregs[21]),
 231   X(fregs[22]),
 232   X(fregs[23]),
 233   X(fregs[24]),
 234   X(fregs[25]),
 235   X(fregs[26]),
 236   X(fregs[27]),
 237   X(fregs[28]),
 238   X(fregs[29]),
 239   X(fregs[30]),
 240   X(fregs[31]),
 241
 242   X(srr0),                      /* IAR (PC) */
 243   X(srr1),                      /* MSR (PS) */
 244   X(cr),                        /* CR */
 245   X(lr),                        /* LR */
 246   X(ctr),                       /* CTR */
 247   X(xer),                       /* XER */
 248   X(mq)                         /* MQ */
 249 };
 250
 251 #endif /* rs6000 */
 252
 253 #ifdef SPARC
 254
 255 /* This routine handles some oddball cases for Sparc registers and LynxOS.
 256    In partucular, it causes refs to G0, g5->7, and all fp regs to return zero.
 257    It also handles knows where to find the I & L regs on the stack.  */
 258
 259 void
 260 fetch_inferior_registers (regno)
 261      int regno;
 262 {
 263   int whatregs = 0;
 264
 265 #define WHATREGS_FLOAT 1
 266 #define WHATREGS_GEN 2
 267 #define WHATREGS_STACK 4
 268
 269   if (regno == -1)
 270     whatregs = WHATREGS_FLOAT | WHATREGS_GEN | WHATREGS_STACK;
 271   else if (regno >= L0_REGNUM && regno <= I7_REGNUM)
 272     whatregs = WHATREGS_STACK;
 273   else if (regno >= FP0_REGNUM && regno < FP0_REGNUM + 32)
 274     whatregs = WHATREGS_FLOAT;
 275   else
 276     whatregs = WHATREGS_GEN;
 277
 278   if (whatregs & WHATREGS_GEN)
 279     {
 280       struct econtext ec;               /* general regs */
 281       char buf[MAX_REGISTER_RAW_SIZE];
 282       int retval;
 283       int i;
 284
 285       errno = 0;
 286       retval = ptrace (PTRACE_GETREGS, inferior_pid, (PTRACE_ARG3_TYPE) &ec,
 287                        0);
 288       if (errno)
 289         perror_with_name ("ptrace(PTRACE_GETREGS)");
 290
 291       memset (buf, 0, REGISTER_RAW_SIZE (G0_REGNUM));
 292       supply_register (G0_REGNUM, buf);
 293       supply_register (TBR_REGNUM, (char *)&ec.tbr);
 294
 295       memcpy (&registers[REGISTER_BYTE (G1_REGNUM)], &ec.g1,
 296               4 * REGISTER_RAW_SIZE (G1_REGNUM));
 297       for (i = G1_REGNUM; i <= G1_REGNUM + 3; i++)
 298         register_valid[i] = 1;
 299
 300       supply_register (PS_REGNUM, (char *)&ec.psr);
 301       supply_register (Y_REGNUM, (char *)&ec.y);
 302       supply_register (PC_REGNUM, (char *)&ec.pc);
 303       supply_register (NPC_REGNUM, (char *)&ec.npc);
 304       supply_register (WIM_REGNUM, (char *)&ec.wim);
 305
 306       memcpy (&registers[REGISTER_BYTE (O0_REGNUM)], ec.o,
 307               8 * REGISTER_RAW_SIZE (O0_REGNUM));
 308       for (i = O0_REGNUM; i <= O0_REGNUM + 7; i++)
 309         register_valid[i] = 1;
 310     }
 311
 312   if (whatregs & WHATREGS_STACK)
 313     {
 314       CORE_ADDR sp;
 315       int i;
 316
 317       sp = read_register (SP_REGNUM);
 318
 319       target_xfer_memory (sp + FRAME_SAVED_I0,
 320                           &registers[REGISTER_BYTE(I0_REGNUM)],
 321                           8 * REGISTER_RAW_SIZE (I0_REGNUM), 0);
 322       for (i = I0_REGNUM; i <= I7_REGNUM; i++)
 323         register_valid[i] = 1;
 324
 325       target_xfer_memory (sp + FRAME_SAVED_L0,
 326                           &registers[REGISTER_BYTE(L0_REGNUM)],
 327                           8 * REGISTER_RAW_SIZE (L0_REGNUM), 0);
 328       for (i = L0_REGNUM; i <= L0_REGNUM + 7; i++)
 329         register_valid[i] = 1;
 330     }
 331
 332   if (whatregs & WHATREGS_FLOAT)
 333     {
 334       struct fcontext fc;               /* fp regs */
 335       int retval;
 336       int i;
 337
 338       errno = 0;
 339       retval = ptrace (PTRACE_GETFPREGS, inferior_pid, (PTRACE_ARG3_TYPE) &fc,
 340                        0);
 341       if (errno)
 342         perror_with_name ("ptrace(PTRACE_GETFPREGS)");
 343
 344       memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)], fc.f.fregs,
 345               32 * REGISTER_RAW_SIZE (FP0_REGNUM));
 346       for (i = FP0_REGNUM; i <= FP0_REGNUM + 31; i++)
 347         register_valid[i] = 1;
 348
 349       supply_register (FPS_REGNUM, (char *)&fc.fsr);
 350     }
 351 }
 352
 353 /* This routine handles storing of the I & L regs for the Sparc.  The trick
 354    here is that they actually live on the stack.  The really tricky part is
 355    that when changing the stack pointer, the I & L regs must be written to
 356    where the new SP points, otherwise the regs will be incorrect when the
 357    process is started up again.   We assume that the I & L regs are valid at
 358    this point.  */
 359
 360 void
 361 store_inferior_registers (regno)
 362      int regno;
 363 {
 364   int whatregs = 0;
 365
 366   if (regno == -1)
 367     whatregs = WHATREGS_FLOAT | WHATREGS_GEN | WHATREGS_STACK;
 368   else if (regno >= L0_REGNUM && regno <= I7_REGNUM)
 369     whatregs = WHATREGS_STACK;
 370   else if (regno >= FP0_REGNUM && regno < FP0_REGNUM + 32)
 371     whatregs = WHATREGS_FLOAT;
 372   else if (regno == SP_REGNUM)
 373     whatregs = WHATREGS_STACK | WHATREGS_GEN;
 374   else
 375     whatregs = WHATREGS_GEN;
 376
 377   if (whatregs & WHATREGS_GEN)
 378     {
 379       struct econtext ec;               /* general regs */
 380       int retval;
 381
 382       ec.tbr = read_register (TBR_REGNUM);
 383       memcpy (&ec.g1, &registers[REGISTER_BYTE (G1_REGNUM)],
 384               4 * REGISTER_RAW_SIZE (G1_REGNUM));
 385
 386       ec.psr = read_register (PS_REGNUM);
 387       ec.y = read_register (Y_REGNUM);
 388       ec.pc = read_register (PC_REGNUM);
 389       ec.npc = read_register (NPC_REGNUM);
 390       ec.wim = read_register (WIM_REGNUM);
 391
 392       memcpy (ec.o, &registers[REGISTER_BYTE (O0_REGNUM)],
 393               8 * REGISTER_RAW_SIZE (O0_REGNUM));
 394
 395       errno = 0;
 396       retval = ptrace (PTRACE_SETREGS, inferior_pid, (PTRACE_ARG3_TYPE) &ec,
 397                        0);
 398       if (errno)
 399         perror_with_name ("ptrace(PTRACE_SETREGS)");
 400     }
 401
 402   if (whatregs & WHATREGS_STACK)
 403     {
 404       int regoffset;
 405       CORE_ADDR sp;
 406
 407       sp = read_register (SP_REGNUM);
 408
 409       if (regno == -1 || regno == SP_REGNUM)
 410         {
 411           if (!register_valid[L0_REGNUM+5])
 412             abort();
 413           target_xfer_memory (sp + FRAME_SAVED_I0,
 414                               &registers[REGISTER_BYTE (I0_REGNUM)],
 415                               8 * REGISTER_RAW_SIZE (I0_REGNUM), 1);
 416
 417           target_xfer_memory (sp + FRAME_SAVED_L0,
 418                               &registers[REGISTER_BYTE (L0_REGNUM)],
 419                               8 * REGISTER_RAW_SIZE (L0_REGNUM), 1);
 420         }
 421       else if (regno >= L0_REGNUM && regno <= I7_REGNUM)
 422         {
 423           if (!register_valid[regno])
 424             abort();
 425           if (regno >= L0_REGNUM && regno <= L0_REGNUM + 7)
 426             regoffset = REGISTER_BYTE (regno) - REGISTER_BYTE (L0_REGNUM)
 427               + FRAME_SAVED_L0;
 428           else
 429             regoffset = REGISTER_BYTE (regno) - REGISTER_BYTE (I0_REGNUM)
 430               + FRAME_SAVED_I0;
 431           target_xfer_memory (sp + regoffset, &registers[REGISTER_BYTE (regno)],
 432                               REGISTER_RAW_SIZE (regno), 1);
 433         }
 434     }
 435
 436   if (whatregs & WHATREGS_FLOAT)
 437     {
 438       struct fcontext fc;               /* fp regs */
 439       int retval;
 440
 441 /* We read fcontext first so that we can get good values for fq_t... */
 442       errno = 0;
 443       retval = ptrace (PTRACE_GETFPREGS, inferior_pid, (PTRACE_ARG3_TYPE) &fc,
 444                        0);
 445       if (errno)
 446         perror_with_name ("ptrace(PTRACE_GETFPREGS)");
 447
 448       memcpy (fc.f.fregs, &registers[REGISTER_BYTE (FP0_REGNUM)],
 449               32 * REGISTER_RAW_SIZE (FP0_REGNUM));
 450
 451       fc.fsr = read_register (FPS_REGNUM);
 452
 453       errno = 0;
 454       retval = ptrace (PTRACE_SETFPREGS, inferior_pid, (PTRACE_ARG3_TYPE) &fc,
 455                        0);
 456       if (errno)
 457         perror_with_name ("ptrace(PTRACE_SETFPREGS)");
 458       }
 459 }
 460 #endif /* SPARC */
 461
 462 #if defined (I386) || defined (M68K) || defined (rs6000)
 463
 464 /* Return the offset relative to the start of the per-thread data to the
 465    saved context block.  */
 466
 467 static unsigned long
 468 registers_addr(pid)
 469      int pid;
 470 {
 471   CORE_ADDR stblock;
 472   int ecpoff = offsetof(st_t, ecp);
 473   CORE_ADDR ecp;
 474
 475   errno = 0;
 476   stblock = (CORE_ADDR) ptrace (PTRACE_THREADUSER, pid, (PTRACE_ARG3_TYPE)0,
 477                                 0);
 478   if (errno)
 479     perror_with_name ("ptrace(PTRACE_THREADUSER)");
 480
 481   ecp = (CORE_ADDR) ptrace (PTRACE_PEEKTHREAD, pid, (PTRACE_ARG3_TYPE)ecpoff,
 482                             0);
 483   if (errno)
 484     perror_with_name ("ptrace(PTRACE_PEEKTHREAD)");
 485
 486   return ecp - stblock;
 487 }
 488
 489 /* Fetch one or more registers from the inferior.  REGNO == -1 to get
 490    them all.  We actually fetch more than requested, when convenient,
 491    marking them as valid so we won't fetch them again.  */
 492
 493 void
 494 fetch_inferior_registers (regno)
 495      int regno;
 496 {
 497   int reglo, reghi;
 498   int i;
 499   unsigned long ecp;
 500
 501   if (regno == -1)
 502     {
 503       reglo = 0;
 504       reghi = NUM_REGS - 1;
 505     }
 506   else
 507     reglo = reghi = regno;
 508
 509   ecp = registers_addr (inferior_pid);
 510
 511   for (regno = reglo; regno <= reghi; regno++)
 512     {
 513       char buf[MAX_REGISTER_RAW_SIZE];
 514       int ptrace_fun = PTRACE_PEEKTHREAD;
 515
 516 #ifdef M68K
 517       ptrace_fun = regno == SP_REGNUM ? PTRACE_PEEKUSP : PTRACE_PEEKTHREAD;
 518 #endif
 519
 520       for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
 521         {
 522           unsigned int reg;
 523
 524           errno = 0;
 525           reg = ptrace (ptrace_fun, inferior_pid,
 526                         (PTRACE_ARG3_TYPE) (ecp + regmap[regno] + i), 0);
 527           if (errno)
 528             perror_with_name ("ptrace(PTRACE_PEEKUSP)");
 529
 530           *(int *)&buf[i] = reg;
 531         }
 532       supply_register (regno, buf);
 533     }
 534 }
 535
 536 /* Store our register values back into the inferior.
 537    If REGNO is -1, do this for all registers.
 538    Otherwise, REGNO specifies which register (so we can save time).  */
 539
 540 /* Registers we shouldn't try to store.  */
 541 #if !defined (CANNOT_STORE_REGISTER)
 542 #define CANNOT_STORE_REGISTER(regno) 0
 543 #endif
 544
 545 void
 546 store_inferior_registers (regno)
 547      int regno;
 548 {
 549   int reglo, reghi;
 550   int i;
 551   unsigned long ecp;
 552
 553   if (regno == -1)
 554     {
 555       reglo = 0;
 556       reghi = NUM_REGS - 1;
 557     }
 558   else
 559     reglo = reghi = regno;
 560
 561   ecp = registers_addr (inferior_pid);
 562
 563   for (regno = reglo; regno <= reghi; regno++)
 564     {
 565       int ptrace_fun = PTRACE_POKEUSER;
 566
 567       if (CANNOT_STORE_REGISTER (regno))
 568         continue;
 569
 570 #ifdef M68K
 571       ptrace_fun = regno == SP_REGNUM ? PTRACE_POKEUSP : PTRACE_POKEUSER;
 572 #endif
 573
 574       for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
 575         {
 576           unsigned int reg;
 577
 578           reg = *(unsigned int *)&registers[REGISTER_BYTE (regno) + i];
 579
 580           errno = 0;
 581           ptrace (ptrace_fun, inferior_pid,
 582                   (PTRACE_ARG3_TYPE) (ecp + regmap[regno] + i), reg);
 583           if (errno)
 584             perror_with_name ("ptrace(PTRACE_POKEUSP)");
 585         }
 586     }
 587 }
 588 #endif /* defined (I386) || defined (M68K) || defined (rs6000) */
 589
 590 /* Wait for child to do something.  Return pid of child, or -1 in case
 591    of error; store status through argument pointer OURSTATUS.  */
 592
 593 int
 594 child_wait (pid, ourstatus)
 595      int pid;
 596      struct target_waitstatus *ourstatus;
 597 {
 598   int save_errno;
 599   int thread;
 600   union wait status;
 601
 602   while (1)
 603     {
 604       int sig;
 605
 606       set_sigint_trap();        /* Causes SIGINT to be passed on to the
 607                                    attached process. */
 608       pid = wait (&status);
 609
 610       save_errno = errno;
 611
 612       clear_sigint_trap();
 613
 614       if (pid == -1)
 615         {
 616           if (save_errno == EINTR)
 617             continue;
 618           fprintf_unfiltered (gdb_stderr, "Child process unexpectedly missing: %s.\n",
 619                    safe_strerror (save_errno));
 620           /* Claim it exited with unknown signal.  */
 621           ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
 622           ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN;
 623           return -1;
 624         }
 625
 626       if (pid != PIDGET (inferior_pid)) /* Some other process?!? */
 627         continue;
 628
 629       thread = status.w_tid;    /* Get thread id from status */
 630
 631       /* Initial thread value can only be acquired via wait, so we have to
 632          resort to this hack.  */
 633
 634       if (TIDGET (inferior_pid) == 0 && thread != 0)
 635         {
 636           inferior_pid = BUILDPID (inferior_pid, thread);
 637           add_thread (inferior_pid);
 638         }
 639
 640       pid = BUILDPID (pid, thread);
 641
 642       /* We've become a single threaded process again.  */
 643       if (thread == 0)
 644         inferior_pid = pid;
 645
 646       /* Check for thread creation.  */
 647       if (WIFSTOPPED(status)
 648           && WSTOPSIG(status) == SIGTRAP
 649           && !in_thread_list (pid))
 650         {
 651           int realsig;
 652
 653           realsig = ptrace (PTRACE_GETTRACESIG, pid, (PTRACE_ARG3_TYPE)0, 0);
 654
 655           if (realsig == SIGNEWTHREAD)
 656             {
 657               /* It's a new thread notification.  Nothing to do here since
 658                  the machine independent code in wait_for_inferior will
 659                  add the thread to the thread list and restart the thread
 660                  when pid != inferior_pid and pid is not in the thread
 661                  list.   We don't even want to much with realsig -- the
 662                  code in wait_for_inferior expects SIGTRAP.  */
 663               ;
 664             }
 665           else
 666             error ("Signal for unknown thread was not SIGNEWTHREAD");
 667         }
 668
 669       /* Check for thread termination.  */
 670       else if (WIFSTOPPED(status)
 671                && WSTOPSIG(status) == SIGTRAP
 672                && in_thread_list (pid))
 673         {
 674           int realsig;
 675
 676           realsig = ptrace (PTRACE_GETTRACESIG, pid, (PTRACE_ARG3_TYPE)0, 0);
 677
 678           if (realsig == SIGTHREADEXIT)
 679             {
 680               ptrace (PTRACE_CONT, PIDGET (pid), (PTRACE_ARG3_TYPE)0, 0);
 681               continue;
 682             }
 683         }
 684
 685 #ifdef SPARC
 686       /* SPARC Lynx uses an byte reversed wait status; we must use the
 687          host macros to access it.  These lines just a copy of
 688          store_waitstatus.  We can't use CHILD_SPECIAL_WAITSTATUS
 689          because target.c can't include the Lynx <sys/wait.h>.  */
 690       if (WIFEXITED (status))
 691         {
 692           ourstatus->kind = TARGET_WAITKIND_EXITED;
 693           ourstatus->value.integer = WEXITSTATUS (status);
 694         }
 695       else if (!WIFSTOPPED (status))
 696         {
 697           ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
 698           ourstatus->value.sig =
 699             target_signal_from_host (WTERMSIG (status));
 700         }
 701       else
 702         {
 703           ourstatus->kind = TARGET_WAITKIND_STOPPED;
 704           ourstatus->value.sig =
 705             target_signal_from_host (WSTOPSIG (status));
 706         }
 707 #else
 708       store_waitstatus (ourstatus, status.w_status);
 709 #endif
 710
 711       return pid;
 712     }
 713 }
 714
 715 /* Return nonzero if the given thread is still alive.  */
 716 int
 717 child_thread_alive (pid)
 718      int pid;
 719 {
 720   /* Arggh.  Apparently pthread_kill only works for threads within
 721      the process that calls pthread_kill.
 722
 723      We want to avoid the lynx signal extensions as they simply don't
 724      map well to the generic gdb interface we want to keep.
 725
 726      All we want to do is determine if a particular thread is alive;
 727      it appears as if we can just make a harmless thread specific
 728      ptrace call to do that.  */
 729   return (ptrace (PTRACE_THREADUSER, pid, 0, 0) != -1);
 730 }
 731
 732 /* Resume execution of the inferior process.
 733    If STEP is nonzero, single-step it.
 734    If SIGNAL is nonzero, give it that signal.  */
 735
 736 void
 737 child_resume (pid, step, signal)
 738      int pid;
 739      int step;
 740      enum target_signal signal;
 741 {
 742   int func;
 743
 744   errno = 0;
 745
 746   /* If pid == -1, then we want to step/continue all threads, else
 747      we only want to step/continue a single thread.  */
 748   if (pid == -1)
 749     {
 750       pid = inferior_pid;
 751       func = step ? PTRACE_SINGLESTEP : PTRACE_CONT;
 752     }
 753   else
 754     func = step ? PTRACE_SINGLESTEP_ONE : PTRACE_CONT_ONE;
 755
 756
 757   /* An address of (PTRACE_ARG3_TYPE)1 tells ptrace to continue from where
 758      it was.  (If GDB wanted it to start some other way, we have already
 759      written a new PC value to the child.)
 760
 761      If this system does not support PT_STEP, a higher level function will
 762      have called single_step() to transmute the step request into a
 763      continue request (by setting breakpoints on all possible successor
 764      instructions), so we don't have to worry about that here.  */
 765
 766   ptrace (func, pid, (PTRACE_ARG3_TYPE) 1, target_signal_to_host (signal));
 767
 768   if (errno)
 769     perror_with_name ("ptrace");
 770 }
 771
 772 /* Convert a Lynx process ID to a string.  Returns the string in a static
 773    buffer.  */
 774
 775 char *
 776 lynx_pid_to_str (pid)
 777      int pid;
 778 {
 779   static char buf[40];
 780
 781   sprintf (buf, "process %d thread %d", PIDGET (pid), TIDGET (pid));
 782
 783   return buf;
 784 }
 785
 786 /* Extract the register values out of the core file and store
 787    them where `read_register' will find them.
 788
 789    CORE_REG_SECT points to the register values themselves, read into memory.
 790    CORE_REG_SIZE is the size of that area.
 791    WHICH says which set of registers we are handling (0 = int, 2 = float
 792          on machines where they are discontiguous).
 793    REG_ADDR is the offset from u.u_ar0 to the register values relative to
 794             core_reg_sect.  This is used with old-fashioned core files to
 795             locate the registers in a large upage-plus-stack ".reg" section.
 796             Original upage address X is at location core_reg_sect+x+reg_addr.
 797  */
 798
 799 void
 800 fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
 801      char *core_reg_sect;
 802      unsigned core_reg_size;
 803      int which;
 804      unsigned reg_addr;
 805 {
 806   struct st_entry s;
 807   unsigned int regno;
 808
 809   for (regno = 0; regno < NUM_REGS; regno++)
 810     if (regmap[regno] != -1)
 811       supply_register (regno, core_reg_sect + offsetof (st_t, ec)
 812                        + regmap[regno]);
 813
 814 #ifdef SPARC
 815 /* Fetching this register causes all of the I & L regs to be read from the
 816    stack and validated.  */
 817
 818   fetch_inferior_registers (I0_REGNUM);
 819 #endif
 820 }