gdb/symm-nat.c

   1 /* Sequent Symmetry host interface, for GDB when running under Unix.
   2    Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1999, 2000,
   3    2001
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 59 Temple Place - Suite 330,
  21    Boston, MA 02111-1307, USA.  */
  22
  23 /* FIXME, some 387-specific items of use taken from i387-tdep.c -- ought to be
  24    merged back in. */
  25
  26 #include "defs.h"
  27 #include "frame.h"
  28 #include "inferior.h"
  29 #include "symtab.h"
  30 #include "target.h"
  31 #include "regcache.h"
  32
  33 /* FIXME: What is the _INKERNEL define for?  */
  34 #define _INKERNEL
  35 #include <signal.h>
  36 #undef _INKERNEL
  37 #include <sys/wait.h>
  38 #include <sys/param.h>
  39 #include <sys/user.h>
  40 #include <sys/proc.h>
  41 #include <sys/dir.h>
  42 #include <sys/ioctl.h>
  43 #include "gdb_stat.h"
  44 #ifdef _SEQUENT_
  45 #include <sys/ptrace.h>
  46 #else
  47 /* Dynix has only machine/ptrace.h, which is already included by sys/user.h  */
  48 /* Dynix has no mptrace call */
  49 #define mptrace ptrace
  50 #endif
  51 #include "gdbcore.h"
  52 #include <fcntl.h>
  53 #include <sgtty.h>
  54 #define TERMINAL struct sgttyb
  55
  56 #include "gdbcore.h"
  57
  58 void
  59 store_inferior_registers (int regno)
  60 {
  61   struct pt_regset regs;
  62   int i;
  63
  64   /* FIXME: Fetching the registers is a kludge to initialize all elements
  65      in the fpu and fpa status. This works for normal debugging, but
  66      might cause problems when calling functions in the inferior.
  67      At least fpu_control and fpa_pcr (probably more) should be added
  68      to the registers array to solve this properly.  */
  69   mptrace (XPT_RREGS, inferior_pid, (PTRACE_ARG3_TYPE) & regs, 0);
  70
  71   regs.pr_eax = *(int *) &registers[REGISTER_BYTE (0)];
  72   regs.pr_ebx = *(int *) &registers[REGISTER_BYTE (5)];
  73   regs.pr_ecx = *(int *) &registers[REGISTER_BYTE (2)];
  74   regs.pr_edx = *(int *) &registers[REGISTER_BYTE (1)];
  75   regs.pr_esi = *(int *) &registers[REGISTER_BYTE (6)];
  76   regs.pr_edi = *(int *) &registers[REGISTER_BYTE (7)];
  77   regs.pr_esp = *(int *) &registers[REGISTER_BYTE (14)];
  78   regs.pr_ebp = *(int *) &registers[REGISTER_BYTE (15)];
  79   regs.pr_eip = *(int *) &registers[REGISTER_BYTE (16)];
  80   regs.pr_flags = *(int *) &registers[REGISTER_BYTE (17)];
  81   for (i = 0; i < 31; i++)
  82     {
  83       regs.pr_fpa.fpa_regs[i] =
  84         *(int *) &registers[REGISTER_BYTE (FP1_REGNUM + i)];
  85     }
  86   memcpy (regs.pr_fpu.fpu_stack[0], &registers[REGISTER_BYTE (ST0_REGNUM)], 10);
  87   memcpy (regs.pr_fpu.fpu_stack[1], &registers[REGISTER_BYTE (ST1_REGNUM)], 10);
  88   memcpy (regs.pr_fpu.fpu_stack[2], &registers[REGISTER_BYTE (ST2_REGNUM)], 10);
  89   memcpy (regs.pr_fpu.fpu_stack[3], &registers[REGISTER_BYTE (ST3_REGNUM)], 10);
  90   memcpy (regs.pr_fpu.fpu_stack[4], &registers[REGISTER_BYTE (ST4_REGNUM)], 10);
  91   memcpy (regs.pr_fpu.fpu_stack[5], &registers[REGISTER_BYTE (ST5_REGNUM)], 10);
  92   memcpy (regs.pr_fpu.fpu_stack[6], &registers[REGISTER_BYTE (ST6_REGNUM)], 10);
  93   memcpy (regs.pr_fpu.fpu_stack[7], &registers[REGISTER_BYTE (ST7_REGNUM)], 10);
  94   mptrace (XPT_WREGS, inferior_pid, (PTRACE_ARG3_TYPE) & regs, 0);
  95 }
  96
  97 void
  98 fetch_inferior_registers (int regno)
  99 {
 100   int i;
 101   struct pt_regset regs;
 102
 103   registers_fetched ();
 104
 105   mptrace (XPT_RREGS, inferior_pid, (PTRACE_ARG3_TYPE) & regs, 0);
 106   *(int *) &registers[REGISTER_BYTE (EAX_REGNUM)] = regs.pr_eax;
 107   *(int *) &registers[REGISTER_BYTE (EBX_REGNUM)] = regs.pr_ebx;
 108   *(int *) &registers[REGISTER_BYTE (ECX_REGNUM)] = regs.pr_ecx;
 109   *(int *) &registers[REGISTER_BYTE (EDX_REGNUM)] = regs.pr_edx;
 110   *(int *) &registers[REGISTER_BYTE (ESI_REGNUM)] = regs.pr_esi;
 111   *(int *) &registers[REGISTER_BYTE (EDI_REGNUM)] = regs.pr_edi;
 112   *(int *) &registers[REGISTER_BYTE (EBP_REGNUM)] = regs.pr_ebp;
 113   *(int *) &registers[REGISTER_BYTE (ESP_REGNUM)] = regs.pr_esp;
 114   *(int *) &registers[REGISTER_BYTE (EIP_REGNUM)] = regs.pr_eip;
 115   *(int *) &registers[REGISTER_BYTE (EFLAGS_REGNUM)] = regs.pr_flags;
 116   for (i = 0; i < FPA_NREGS; i++)
 117     {
 118       *(int *) &registers[REGISTER_BYTE (FP1_REGNUM + i)] =
 119         regs.pr_fpa.fpa_regs[i];
 120     }
 121   memcpy (&registers[REGISTER_BYTE (ST0_REGNUM)], regs.pr_fpu.fpu_stack[0], 10);
 122   memcpy (&registers[REGISTER_BYTE (ST1_REGNUM)], regs.pr_fpu.fpu_stack[1], 10);
 123   memcpy (&registers[REGISTER_BYTE (ST2_REGNUM)], regs.pr_fpu.fpu_stack[2], 10);
 124   memcpy (&registers[REGISTER_BYTE (ST3_REGNUM)], regs.pr_fpu.fpu_stack[3], 10);
 125   memcpy (&registers[REGISTER_BYTE (ST4_REGNUM)], regs.pr_fpu.fpu_stack[4], 10);
 126   memcpy (&registers[REGISTER_BYTE (ST5_REGNUM)], regs.pr_fpu.fpu_stack[5], 10);
 127   memcpy (&registers[REGISTER_BYTE (ST6_REGNUM)], regs.pr_fpu.fpu_stack[6], 10);
 128   memcpy (&registers[REGISTER_BYTE (ST7_REGNUM)], regs.pr_fpu.fpu_stack[7], 10);
 129 }
 130 \f
 131 /* FIXME:  This should be merged with i387-tdep.c as well. */
 132 static
 133 print_fpu_status (struct pt_regset ep)
 134 {
 135   int i;
 136   int bothstatus;
 137   int top;
 138   int fpreg;
 139   unsigned char *p;
 140
 141   printf_unfiltered ("80387:");
 142   if (ep.pr_fpu.fpu_ip == 0)
 143     {
 144       printf_unfiltered (" not in use.\n");
 145       return;
 146     }
 147   else
 148     {
 149       printf_unfiltered ("\n");
 150     }
 151   if (ep.pr_fpu.fpu_status != 0)
 152     {
 153       print_387_status_word (ep.pr_fpu.fpu_status);
 154     }
 155   print_387_control_word (ep.pr_fpu.fpu_control);
 156   printf_unfiltered ("last exception: ");
 157   printf_unfiltered ("opcode 0x%x; ", ep.pr_fpu.fpu_rsvd4);
 158   printf_unfiltered ("pc 0x%x:0x%x; ", ep.pr_fpu.fpu_cs, ep.pr_fpu.fpu_ip);
 159   printf_unfiltered ("operand 0x%x:0x%x\n", ep.pr_fpu.fpu_data_offset, ep.pr_fpu.fpu_op_sel);
 160
 161   top = (ep.pr_fpu.fpu_status >> 11) & 7;
 162
 163   printf_unfiltered ("regno  tag  msb              lsb  value\n");
 164   for (fpreg = 7; fpreg >= 0; fpreg--)
 165     {
 166       double val;
 167
 168       printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : "  ", fpreg);
 169
 170       switch ((ep.pr_fpu.fpu_tag >> (fpreg * 2)) & 3)
 171         {
 172         case 0:
 173           printf_unfiltered ("valid ");
 174           break;
 175         case 1:
 176           printf_unfiltered ("zero  ");
 177           break;
 178         case 2:
 179           printf_unfiltered ("trap  ");
 180           break;
 181         case 3:
 182           printf_unfiltered ("empty ");
 183           break;
 184         }
 185       for (i = 9; i >= 0; i--)
 186         printf_unfiltered ("%02x", ep.pr_fpu.fpu_stack[fpreg][i]);
 187
 188       i387_to_double ((char *) ep.pr_fpu.fpu_stack[fpreg], (char *) &val);
 189       printf_unfiltered ("  %g\n", val);
 190     }
 191   if (ep.pr_fpu.fpu_rsvd1)
 192     warning ("rsvd1 is 0x%x\n", ep.pr_fpu.fpu_rsvd1);
 193   if (ep.pr_fpu.fpu_rsvd2)
 194     warning ("rsvd2 is 0x%x\n", ep.pr_fpu.fpu_rsvd2);
 195   if (ep.pr_fpu.fpu_rsvd3)
 196     warning ("rsvd3 is 0x%x\n", ep.pr_fpu.fpu_rsvd3);
 197   if (ep.pr_fpu.fpu_rsvd5)
 198     warning ("rsvd5 is 0x%x\n", ep.pr_fpu.fpu_rsvd5);
 199 }
 200
 201
 202 print_1167_control_word (unsigned int pcr)
 203 {
 204   int pcr_tmp;
 205
 206   pcr_tmp = pcr & FPA_PCR_MODE;
 207   printf_unfiltered ("\tMODE= %#x; RND= %#x ", pcr_tmp, pcr_tmp & 12);
 208   switch (pcr_tmp & 12)
 209     {
 210     case 0:
 211       printf_unfiltered ("RN (Nearest Value)");
 212       break;
 213     case 1:
 214       printf_unfiltered ("RZ (Zero)");
 215       break;
 216     case 2:
 217       printf_unfiltered ("RP (Positive Infinity)");
 218       break;
 219     case 3:
 220       printf_unfiltered ("RM (Negative Infinity)");
 221       break;
 222     }
 223   printf_unfiltered ("; IRND= %d ", pcr_tmp & 2);
 224   if (0 == pcr_tmp & 2)
 225     {
 226       printf_unfiltered ("(same as RND)\n");
 227     }
 228   else
 229     {
 230       printf_unfiltered ("(toward zero)\n");
 231     }
 232   pcr_tmp = pcr & FPA_PCR_EM;
 233   printf_unfiltered ("\tEM= %#x", pcr_tmp);
 234   if (pcr_tmp & FPA_PCR_EM_DM)
 235     printf_unfiltered (" DM");
 236   if (pcr_tmp & FPA_PCR_EM_UOM)
 237     printf_unfiltered (" UOM");
 238   if (pcr_tmp & FPA_PCR_EM_PM)
 239     printf_unfiltered (" PM");
 240   if (pcr_tmp & FPA_PCR_EM_UM)
 241     printf_unfiltered (" UM");
 242   if (pcr_tmp & FPA_PCR_EM_OM)
 243     printf_unfiltered (" OM");
 244   if (pcr_tmp & FPA_PCR_EM_ZM)
 245     printf_unfiltered (" ZM");
 246   if (pcr_tmp & FPA_PCR_EM_IM)
 247     printf_unfiltered (" IM");
 248   printf_unfiltered ("\n");
 249   pcr_tmp = FPA_PCR_CC;
 250   printf_unfiltered ("\tCC= %#x", pcr_tmp);
 251   if (pcr_tmp & FPA_PCR_20MHZ)
 252     printf_unfiltered (" 20MHZ");
 253   if (pcr_tmp & FPA_PCR_CC_Z)
 254     printf_unfiltered (" Z");
 255   if (pcr_tmp & FPA_PCR_CC_C2)
 256     printf_unfiltered (" C2");
 257
 258   /* Dynix defines FPA_PCR_CC_C0 to 0x100 and ptx defines
 259      FPA_PCR_CC_C1 to 0x100.  Use whichever is defined and assume
 260      the OS knows what it is doing.  */
 261 #ifdef FPA_PCR_CC_C1
 262   if (pcr_tmp & FPA_PCR_CC_C1)
 263     printf_unfiltered (" C1");
 264 #else
 265   if (pcr_tmp & FPA_PCR_CC_C0)
 266     printf_unfiltered (" C0");
 267 #endif
 268
 269   switch (pcr_tmp)
 270     {
 271     case FPA_PCR_CC_Z:
 272       printf_unfiltered (" (Equal)");
 273       break;
 274 #ifdef FPA_PCR_CC_C1
 275     case FPA_PCR_CC_C1:
 276 #else
 277     case FPA_PCR_CC_C0:
 278 #endif
 279       printf_unfiltered (" (Less than)");
 280       break;
 281     case 0:
 282       printf_unfiltered (" (Greater than)");
 283       break;
 284       case FPA_PCR_CC_Z |
 285 #ifdef FPA_PCR_CC_C1
 286         FPA_PCR_CC_C1
 287 #else
 288         FPA_PCR_CC_C0
 289 #endif
 290     | FPA_PCR_CC_C2:
 291       printf_unfiltered (" (Unordered)");
 292       break;
 293     default:
 294       printf_unfiltered (" (Undefined)");
 295       break;
 296     }
 297   printf_unfiltered ("\n");
 298   pcr_tmp = pcr & FPA_PCR_AE;
 299   printf_unfiltered ("\tAE= %#x", pcr_tmp);
 300   if (pcr_tmp & FPA_PCR_AE_DE)
 301     printf_unfiltered (" DE");
 302   if (pcr_tmp & FPA_PCR_AE_UOE)
 303     printf_unfiltered (" UOE");
 304   if (pcr_tmp & FPA_PCR_AE_PE)
 305     printf_unfiltered (" PE");
 306   if (pcr_tmp & FPA_PCR_AE_UE)
 307     printf_unfiltered (" UE");
 308   if (pcr_tmp & FPA_PCR_AE_OE)
 309     printf_unfiltered (" OE");
 310   if (pcr_tmp & FPA_PCR_AE_ZE)
 311     printf_unfiltered (" ZE");
 312   if (pcr_tmp & FPA_PCR_AE_EE)
 313     printf_unfiltered (" EE");
 314   if (pcr_tmp & FPA_PCR_AE_IE)
 315     printf_unfiltered (" IE");
 316   printf_unfiltered ("\n");
 317 }
 318
 319 print_1167_regs (long regs[FPA_NREGS])
 320 {
 321   int i;
 322
 323   union
 324     {
 325       double d;
 326       long l[2];
 327     }
 328   xd;
 329   union
 330     {
 331       float f;
 332       long l;
 333     }
 334   xf;
 335
 336
 337   for (i = 0; i < FPA_NREGS; i++)
 338     {
 339       xf.l = regs[i];
 340       printf_unfiltered ("%%fp%d: raw= %#x, single= %f", i + 1, regs[i], xf.f);
 341       if (!(i & 1))
 342         {
 343           printf_unfiltered ("\n");
 344         }
 345       else
 346         {
 347           xd.l[1] = regs[i];
 348           xd.l[0] = regs[i + 1];
 349           printf_unfiltered (", double= %f\n", xd.d);
 350         }
 351     }
 352 }
 353
 354 print_fpa_status (struct pt_regset ep)
 355 {
 356
 357   printf_unfiltered ("WTL 1167:");
 358   if (ep.pr_fpa.fpa_pcr != 0)
 359     {
 360       printf_unfiltered ("\n");
 361       print_1167_control_word (ep.pr_fpa.fpa_pcr);
 362       print_1167_regs (ep.pr_fpa.fpa_regs);
 363     }
 364   else
 365     {
 366       printf_unfiltered (" not in use.\n");
 367     }
 368 }
 369
 370 #if 0                           /* disabled because it doesn't go through the target vector.  */
 371 i386_float_info (void)
 372 {
 373   char ubuf[UPAGES * NBPG];
 374   struct pt_regset regset;
 375
 376   if (have_inferior_p ())
 377     {
 378       PTRACE_READ_REGS (inferior_pid, (PTRACE_ARG3_TYPE) & regset);
 379     }
 380   else
 381     {
 382       int corechan = bfd_cache_lookup (core_bfd);
 383       if (lseek (corechan, 0, 0) < 0)
 384         {
 385           perror ("seek on core file");
 386         }
 387       if (myread (corechan, ubuf, UPAGES * NBPG) < 0)
 388         {
 389           perror ("read on core file");
 390         }
 391       /* only interested in the floating point registers */
 392       regset.pr_fpu = ((struct user *) ubuf)->u_fpusave;
 393       regset.pr_fpa = ((struct user *) ubuf)->u_fpasave;
 394     }
 395   print_fpu_status (regset);
 396   print_fpa_status (regset);
 397 }
 398 #endif
 399
 400 static volatile int got_sigchld;
 401
 402 /*ARGSUSED */
 403 /* This will eventually be more interesting. */
 404 void
 405 sigchld_handler (int signo)
 406 {
 407   got_sigchld++;
 408 }
 409
 410 /*
 411  * Signals for which the default action does not cause the process
 412  * to die.  See <sys/signal.h> for where this came from (alas, we
 413  * can't use those macros directly)
 414  */
 415 #ifndef sigmask
 416 #define sigmask(s) (1 << ((s) - 1))
 417 #endif
 418 #define SIGNALS_DFL_SAFE sigmask(SIGSTOP) | sigmask(SIGTSTP) | \
 419         sigmask(SIGTTIN) | sigmask(SIGTTOU) | sigmask(SIGCHLD) | \
 420         sigmask(SIGCONT) | sigmask(SIGWINCH) | sigmask(SIGPWR) | \
 421         sigmask(SIGURG) | sigmask(SIGPOLL)
 422
 423 #ifdef ATTACH_DETACH
 424 /*
 425  * Thanks to XPT_MPDEBUGGER, we have to mange child_wait().
 426  */
 427 int
 428 child_wait (int pid, struct target_waitstatus *status)
 429 {
 430   int save_errno, rv, xvaloff, saoff, sa_hand;
 431   struct pt_stop pt;
 432   struct user u;
 433   sigset_t set;
 434   /* Host signal number for a signal which the inferior terminates with, or
 435      0 if it hasn't terminated due to a signal.  */
 436   static int death_by_signal = 0;
 437 #ifdef SVR4_SHARED_LIBS         /* use this to distinguish ptx 2 vs ptx 4 */
 438   prstatus_t pstatus;
 439 #endif
 440
 441   do
 442     {
 443       set_sigint_trap ();       /* Causes SIGINT to be passed on to the
 444                                    attached process. */
 445       save_errno = errno;
 446
 447       got_sigchld = 0;
 448
 449       sigemptyset (&set);
 450
 451       while (got_sigchld == 0)
 452         {
 453           sigsuspend (&set);
 454         }
 455
 456       clear_sigint_trap ();
 457
 458       rv = mptrace (XPT_STOPSTAT, 0, (char *) &pt, 0);
 459       if (-1 == rv)
 460         {
 461           printf ("XPT_STOPSTAT: errno %d\n", errno);   /* DEBUG */
 462           continue;
 463         }
 464
 465       pid = pt.ps_pid;
 466
 467       if (pid != inferior_pid)
 468         {
 469           /* NOTE: the mystery fork in csh/tcsh needs to be ignored.
 470            * We should not return new children for the initial run
 471            * of a process until it has done the exec.
 472            */
 473           /* inferior probably forked; send it on its way */
 474           rv = mptrace (XPT_UNDEBUG, pid, 0, 0);
 475           if (-1 == rv)
 476             {
 477               printf ("child_wait: XPT_UNDEBUG: pid %d: %s\n", pid,
 478                       safe_strerror (errno));
 479             }
 480           continue;
 481         }
 482       /* FIXME: Do we deal with fork notification correctly?  */
 483       switch (pt.ps_reason)
 484         {
 485         case PTS_FORK:
 486           /* multi proc: treat like PTS_EXEC */
 487           /*
 488            * Pretend this didn't happen, since gdb isn't set up
 489            * to deal with stops on fork.
 490            */
 491           rv = ptrace (PT_CONTSIG, pid, 1, 0);
 492           if (-1 == rv)
 493             {
 494               printf ("PTS_FORK: PT_CONTSIG: error %d\n", errno);
 495             }
 496           continue;
 497         case PTS_EXEC:
 498           /*
 499            * Pretend this is a SIGTRAP.
 500            */
 501           status->kind = TARGET_WAITKIND_STOPPED;
 502           status->value.sig = TARGET_SIGNAL_TRAP;
 503           break;
 504         case PTS_EXIT:
 505           /*
 506            * Note: we stop before the exit actually occurs.  Extract
 507            * the exit code from the uarea.  If we're stopped in the
 508            * exit() system call, the exit code will be in
 509            * u.u_ap[0].  An exit due to an uncaught signal will have
 510            * something else in here, see the comment in the default:
 511            * case, below.  Finally,let the process exit.
 512            */
 513           if (death_by_signal)
 514             {
 515               status->kind = TARGET_WAITKIND_SIGNALED;
 516               status->value.sig = target_signal_from_host (death_by_signal);
 517               death_by_signal = 0;
 518               break;
 519             }
 520           xvaloff = (unsigned long) &u.u_ap[0] - (unsigned long) &u;
 521           errno = 0;
 522           rv = ptrace (PT_RUSER, pid, (char *) xvaloff, 0);
 523           status->kind = TARGET_WAITKIND_EXITED;
 524           status->value.integer = rv;
 525           /*
 526            * addr & data to mptrace() don't matter here, since
 527            * the process is already dead.
 528            */
 529           rv = mptrace (XPT_UNDEBUG, pid, 0, 0);
 530           if (-1 == rv)
 531             {
 532               printf ("child_wait: PTS_EXIT: XPT_UNDEBUG: pid %d error %d\n", pid,
 533                       errno);
 534             }
 535           break;
 536         case PTS_WATCHPT_HIT:
 537           internal_error (__FILE__, __LINE__,
 538                           "PTS_WATCHPT_HIT\n");
 539           break;
 540         default:
 541           /* stopped by signal */
 542           status->kind = TARGET_WAITKIND_STOPPED;
 543           status->value.sig = target_signal_from_host (pt.ps_reason);
 544           death_by_signal = 0;
 545
 546           if (0 == (SIGNALS_DFL_SAFE & sigmask (pt.ps_reason)))
 547             {
 548               break;
 549             }
 550           /* else default action of signal is to die */
 551 #ifdef SVR4_SHARED_LIBS
 552           rv = ptrace (PT_GET_PRSTATUS, pid, (char *) &pstatus, 0);
 553           if (-1 == rv)
 554             error ("child_wait: signal %d PT_GET_PRSTATUS: %s\n",
 555                    pt.ps_reason, safe_strerror (errno));
 556           if (pstatus.pr_cursig != pt.ps_reason)
 557             {
 558               printf ("pstatus signal %d, pt signal %d\n",
 559                       pstatus.pr_cursig, pt.ps_reason);
 560             }
 561           sa_hand = (int) pstatus.pr_action.sa_handler;
 562 #else
 563           saoff = (unsigned long) &u.u_sa[0] - (unsigned long) &u;
 564           saoff += sizeof (struct sigaction) * (pt.ps_reason - 1);
 565           errno = 0;
 566           sa_hand = ptrace (PT_RUSER, pid, (char *) saoff, 0);
 567           if (errno)
 568             error ("child_wait: signal %d: RUSER: %s\n",
 569                    pt.ps_reason, safe_strerror (errno));
 570 #endif
 571           if ((int) SIG_DFL == sa_hand)
 572             {
 573               /* we will be dying */
 574               death_by_signal = pt.ps_reason;
 575             }
 576           break;
 577         }
 578
 579     }
 580   while (pid != inferior_pid);  /* Some other child died or stopped */
 581
 582   return pid;
 583 }
 584 #else /* !ATTACH_DETACH */
 585 /*
 586  * Simple child_wait() based on inftarg.c child_wait() for use until
 587  * the MPDEBUGGER child_wait() works properly.  This will go away when
 588  * that is fixed.
 589  */
 590 child_wait (int pid, struct target_waitstatus *ourstatus)
 591 {
 592   int save_errno;
 593   int status;
 594
 595   do
 596     {
 597       pid = wait (&status);
 598       save_errno = errno;
 599
 600       if (pid == -1)
 601         {
 602           if (save_errno == EINTR)
 603             continue;
 604           fprintf (stderr, "Child process unexpectedly missing: %s.\n",
 605                    safe_strerror (save_errno));
 606           ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
 607           ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN;
 608           return -1;
 609         }
 610     }
 611   while (pid != inferior_pid);  /* Some other child died or stopped */
 612   store_waitstatus (ourstatus, status);
 613   return pid;
 614 }
 615 #endif /* ATTACH_DETACH */
 616 \f
 617
 618
 619 /* This function simply calls ptrace with the given arguments.
 620    It exists so that all calls to ptrace are isolated in this
 621    machine-dependent file. */
 622 int
 623 call_ptrace (int request, int pid, PTRACE_ARG3_TYPE addr, int data)
 624 {
 625   return ptrace (request, pid, addr, data);
 626 }
 627
 628 int
 629 call_mptrace (int request, int pid, PTRACE_ARG3_TYPE addr, int data)
 630 {
 631   return mptrace (request, pid, addr, data);
 632 }
 633
 634 #if defined (DEBUG_PTRACE)
 635 /* For the rest of the file, use an extra level of indirection */
 636 /* This lets us breakpoint usefully on call_ptrace. */
 637 #define ptrace call_ptrace
 638 #define mptrace call_mptrace
 639 #endif
 640
 641 void
 642 kill_inferior (void)
 643 {
 644   if (inferior_pid == 0)
 645     return;
 646
 647   /* For MPDEBUGGER, don't use PT_KILL, since the child will stop
 648      again with a PTS_EXIT.  Just hit him with SIGKILL (so he stops)
 649      and detach. */
 650
 651   kill (inferior_pid, SIGKILL);
 652 #ifdef ATTACH_DETACH
 653   detach (SIGKILL);
 654 #else /* ATTACH_DETACH */
 655   ptrace (PT_KILL, inferior_pid, 0, 0);
 656   wait ((int *) NULL);
 657 #endif /* ATTACH_DETACH */
 658   target_mourn_inferior ();
 659 }
 660
 661 /* Resume execution of the inferior process.
 662    If STEP is nonzero, single-step it.
 663    If SIGNAL is nonzero, give it that signal.  */
 664
 665 void
 666 child_resume (int pid, int step, enum target_signal signal)
 667 {
 668   errno = 0;
 669
 670   if (pid == -1)
 671     pid = inferior_pid;
 672
 673   /* An address of (PTRACE_ARG3_TYPE)1 tells ptrace to continue from where
 674      it was.  (If GDB wanted it to start some other way, we have already
 675      written a new PC value to the child.)
 676
 677      If this system does not support PT_SSTEP, a higher level function will
 678      have called single_step() to transmute the step request into a
 679      continue request (by setting breakpoints on all possible successor
 680      instructions), so we don't have to worry about that here.  */
 681
 682   if (step)
 683     ptrace (PT_SSTEP, pid, (PTRACE_ARG3_TYPE) 1, signal);
 684   else
 685     ptrace (PT_CONTSIG, pid, (PTRACE_ARG3_TYPE) 1, signal);
 686
 687   if (errno)
 688     perror_with_name ("ptrace");
 689 }
 690 \f
 691 #ifdef ATTACH_DETACH
 692 /* Start debugging the process whose number is PID.  */
 693 int
 694 attach (int pid)
 695 {
 696   sigset_t set;
 697   int rv;
 698
 699   rv = mptrace (XPT_DEBUG, pid, 0, 0);
 700   if (-1 == rv)
 701     {
 702       error ("mptrace(XPT_DEBUG): %s", safe_strerror (errno));
 703     }
 704   rv = mptrace (XPT_SIGNAL, pid, 0, SIGSTOP);
 705   if (-1 == rv)
 706     {
 707       error ("mptrace(XPT_SIGNAL): %s", safe_strerror (errno));
 708     }
 709   attach_flag = 1;
 710   return pid;
 711 }
 712
 713 void
 714 detach (int signo)
 715 {
 716   int rv;
 717
 718   rv = mptrace (XPT_UNDEBUG, inferior_pid, 1, signo);
 719   if (-1 == rv)
 720     {
 721       error ("mptrace(XPT_UNDEBUG): %s", safe_strerror (errno));
 722     }
 723   attach_flag = 0;
 724 }
 725
 726 #endif /* ATTACH_DETACH */
 727 \f
 728 /* Default the type of the ptrace transfer to int.  */
 729 #ifndef PTRACE_XFER_TYPE
 730 #define PTRACE_XFER_TYPE int
 731 #endif
 732 \f
 733
 734 /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
 735    in the NEW_SUN_PTRACE case.
 736    It ought to be straightforward.  But it appears that writing did
 737    not write the data that I specified.  I cannot understand where
 738    it got the data that it actually did write.  */
 739
 740 /* Copy LEN bytes to or from inferior's memory starting at MEMADDR
 741    to debugger memory starting at MYADDR.   Copy to inferior if
 742    WRITE is nonzero.  TARGET is ignored.
 743
 744    Returns the length copied, which is either the LEN argument or zero.
 745    This xfer function does not do partial moves, since child_ops
 746    doesn't allow memory operations to cross below us in the target stack
 747    anyway.  */
 748
 749 int
 750 child_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write,
 751                    struct mem_attrib *attrib,
 752                    struct target_ops *target)
 753 {
 754   register int i;
 755   /* Round starting address down to longword boundary.  */
 756   register CORE_ADDR addr = memaddr & -sizeof (PTRACE_XFER_TYPE);
 757   /* Round ending address up; get number of longwords that makes.  */
 758   register int count
 759   = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1)
 760   / sizeof (PTRACE_XFER_TYPE);
 761   /* Allocate buffer of that many longwords.  */
 762   register PTRACE_XFER_TYPE *buffer
 763   = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE));
 764
 765   if (write)
 766     {
 767       /* Fill start and end extra bytes of buffer with existing memory data.  */
 768
 769       if (addr != memaddr || len < (int) sizeof (PTRACE_XFER_TYPE))
 770         {
 771           /* Need part of initial word -- fetch it.  */
 772           buffer[0] = ptrace (PT_RTEXT, inferior_pid, (PTRACE_ARG3_TYPE) addr,
 773                               0);
 774         }
 775
 776       if (count > 1)            /* FIXME, avoid if even boundary */
 777         {
 778           buffer[count - 1]
 779             = ptrace (PT_RTEXT, inferior_pid,
 780                       ((PTRACE_ARG3_TYPE)
 781                        (addr + (count - 1) * sizeof (PTRACE_XFER_TYPE))),
 782                       0);
 783         }
 784
 785       /* Copy data to be written over corresponding part of buffer */
 786
 787       memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)),
 788               myaddr,
 789               len);
 790
 791       /* Write the entire buffer.  */
 792
 793       for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
 794         {
 795           errno = 0;
 796           ptrace (PT_WDATA, inferior_pid, (PTRACE_ARG3_TYPE) addr,
 797                   buffer[i]);
 798           if (errno)
 799             {
 800               /* Using the appropriate one (I or D) is necessary for
 801                  Gould NP1, at least.  */
 802               errno = 0;
 803               ptrace (PT_WTEXT, inferior_pid, (PTRACE_ARG3_TYPE) addr,
 804                       buffer[i]);
 805             }
 806           if (errno)
 807             return 0;
 808         }
 809     }
 810   else
 811     {
 812       /* Read all the longwords */
 813       for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
 814         {
 815           errno = 0;
 816           buffer[i] = ptrace (PT_RTEXT, inferior_pid,
 817                               (PTRACE_ARG3_TYPE) addr, 0);
 818           if (errno)
 819             return 0;
 820           QUIT;
 821         }
 822
 823       /* Copy appropriate bytes out of the buffer.  */
 824       memcpy (myaddr,
 825               (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)),
 826               len);
 827     }
 828   return len;
 829 }
 830
 831
 832 void
 833 _initialize_symm_nat (void)
 834 {
 835 #ifdef ATTACH_DETACH
 836 /*
 837  * the MPDEBUGGER is necessary for process tree debugging and attach
 838  * to work, but it alters the behavior of debugged processes, so other
 839  * things (at least child_wait()) will have to change to accomodate
 840  * that.
 841  *
 842  * Note that attach is not implemented in dynix 3, and not in ptx
 843  * until version 2.1 of the OS.
 844  */
 845   int rv;
 846   sigset_t set;
 847   struct sigaction sact;
 848
 849   rv = mptrace (XPT_MPDEBUGGER, 0, 0, 0);
 850   if (-1 == rv)
 851     {
 852       internal_error (__FILE__, __LINE__,
 853                       "_initialize_symm_nat(): mptrace(XPT_MPDEBUGGER): %s",
 854                       safe_strerror (errno));
 855     }
 856
 857   /*
 858    * Under MPDEBUGGER, we get SIGCLHD when a traced process does
 859    * anything of interest.
 860    */
 861
 862   /*
 863    * Block SIGCHLD.  We leave it blocked all the time, and then
 864    * call sigsuspend() in child_wait() to wait for the child
 865    * to do something.  None of these ought to fail, but check anyway.
 866    */
 867   sigemptyset (&set);
 868   rv = sigaddset (&set, SIGCHLD);
 869   if (-1 == rv)
 870     {
 871       internal_error (__FILE__, __LINE__,
 872                       "_initialize_symm_nat(): sigaddset(SIGCHLD): %s",
 873                       safe_strerror (errno));
 874     }
 875   rv = sigprocmask (SIG_BLOCK, &set, (sigset_t *) NULL);
 876   if (-1 == rv)
 877     {
 878       internal_error (__FILE__, __LINE__,
 879                       "_initialize_symm_nat(): sigprocmask(SIG_BLOCK): %s",
 880                       safe_strerror (errno));
 881     }
 882
 883   sact.sa_handler = sigchld_handler;
 884   sigemptyset (&sact.sa_mask);
 885   sact.sa_flags = SA_NOCLDWAIT; /* keep the zombies away */
 886   rv = sigaction (SIGCHLD, &sact, (struct sigaction *) NULL);
 887   if (-1 == rv)
 888     {
 889       internal_error (__FILE__, __LINE__,
 890                       "_initialize_symm_nat(): sigaction(SIGCHLD): %s",
 891                       safe_strerror (errno));
 892     }
 893 #endif
 894 }