Initial creation of sourceware repositorygdb-4_18-branchpoint

1 files changed, 846 insertions, 0 deletions

diff --git a/gdb/symm-nat.c b/gdb/symm-nat.c
new file mode 100644
index 0000000..0461066
--- /dev/null
+++ b/gdb/symm-nat.c
@@ -0,0 +1,846 @@
+/* Sequent Symmetry host interface, for GDB when running under Unix.
+   Copyright 1986, 1987, 1989, 1991, 1992, 1994 Free Software Foundation, Inc.
+
+This file is part of GDB.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+/* FIXME, some 387-specific items of use taken from i387-tdep.c -- ought to be
+   merged back in. */
+
+#include "defs.h"
+#include "frame.h"
+#include "inferior.h"
+#include "symtab.h"
+#include "target.h"
+
+/* FIXME: What is the _INKERNEL define for?  */
+#define _INKERNEL
+#include <signal.h>
+#undef _INKERNEL
+#include <sys/wait.h>
+#include <sys/param.h>
+#include <sys/user.h>
+#include <sys/proc.h>
+#include <sys/dir.h>
+#include <sys/ioctl.h>
+#include "gdb_stat.h"
+#ifdef _SEQUENT_
+#include <sys/ptrace.h>
+#else
+/* Dynix has only machine/ptrace.h, which is already included by sys/user.h  */
+/* Dynix has no mptrace call */
+#define mptrace ptrace
+#endif
+#include "gdbcore.h"
+#include <fcntl.h>
+#include <sgtty.h>
+#define TERMINAL struct sgttyb
+
+#include "gdbcore.h"
+
+void
+store_inferior_registers(regno)
+int regno;
+{
+  struct pt_regset regs;
+  int i;
+  extern char registers[];
+
+  /* FIXME: Fetching the registers is a kludge to initialize all elements
+     in the fpu and fpa status. This works for normal debugging, but
+     might cause problems when calling functions in the inferior.
+     At least fpu_control and fpa_pcr (probably more) should be added 
+     to the registers array to solve this properly.  */
+  mptrace (XPT_RREGS, inferior_pid, (PTRACE_ARG3_TYPE) &regs, 0);
+
+  regs.pr_eax = *(int *)&registers[REGISTER_BYTE(0)];
+  regs.pr_ebx = *(int *)&registers[REGISTER_BYTE(5)];
+  regs.pr_ecx = *(int *)&registers[REGISTER_BYTE(2)];
+  regs.pr_edx = *(int *)&registers[REGISTER_BYTE(1)];
+  regs.pr_esi = *(int *)&registers[REGISTER_BYTE(6)];
+  regs.pr_edi = *(int *)&registers[REGISTER_BYTE(7)];
+  regs.pr_esp = *(int *)&registers[REGISTER_BYTE(14)];
+  regs.pr_ebp = *(int *)&registers[REGISTER_BYTE(15)];
+  regs.pr_eip = *(int *)&registers[REGISTER_BYTE(16)];
+  regs.pr_flags = *(int *)&registers[REGISTER_BYTE(17)];
+  for (i = 0; i < 31; i++)
+    {
+      regs.pr_fpa.fpa_regs[i] =
+	*(int *)&registers[REGISTER_BYTE(FP1_REGNUM+i)];
+    }
+  memcpy (regs.pr_fpu.fpu_stack[0], &registers[REGISTER_BYTE(ST0_REGNUM)], 10);
+  memcpy (regs.pr_fpu.fpu_stack[1], &registers[REGISTER_BYTE(ST1_REGNUM)], 10);
+  memcpy (regs.pr_fpu.fpu_stack[2], &registers[REGISTER_BYTE(ST2_REGNUM)], 10);
+  memcpy (regs.pr_fpu.fpu_stack[3], &registers[REGISTER_BYTE(ST3_REGNUM)], 10);
+  memcpy (regs.pr_fpu.fpu_stack[4], &registers[REGISTER_BYTE(ST4_REGNUM)], 10);
+  memcpy (regs.pr_fpu.fpu_stack[5], &registers[REGISTER_BYTE(ST5_REGNUM)], 10);
+  memcpy (regs.pr_fpu.fpu_stack[6], &registers[REGISTER_BYTE(ST6_REGNUM)], 10);
+  memcpy (regs.pr_fpu.fpu_stack[7], &registers[REGISTER_BYTE(ST7_REGNUM)], 10);
+  mptrace (XPT_WREGS, inferior_pid, (PTRACE_ARG3_TYPE) &regs, 0);
+}
+
+void
+fetch_inferior_registers (regno)
+     int regno;
+{
+  int i;
+  struct pt_regset regs;
+  extern char registers[];
+
+  registers_fetched ();
+
+  mptrace (XPT_RREGS, inferior_pid, (PTRACE_ARG3_TYPE) &regs, 0);
+  *(int *)&registers[REGISTER_BYTE(EAX_REGNUM)] = regs.pr_eax;
+  *(int *)&registers[REGISTER_BYTE(EBX_REGNUM)] = regs.pr_ebx;
+  *(int *)&registers[REGISTER_BYTE(ECX_REGNUM)] = regs.pr_ecx;
+  *(int *)&registers[REGISTER_BYTE(EDX_REGNUM)] = regs.pr_edx;
+  *(int *)&registers[REGISTER_BYTE(ESI_REGNUM)] = regs.pr_esi;
+  *(int *)&registers[REGISTER_BYTE(EDI_REGNUM)] = regs.pr_edi;
+  *(int *)&registers[REGISTER_BYTE(EBP_REGNUM)] = regs.pr_ebp;
+  *(int *)&registers[REGISTER_BYTE(ESP_REGNUM)] = regs.pr_esp;
+  *(int *)&registers[REGISTER_BYTE(EIP_REGNUM)] = regs.pr_eip;
+  *(int *)&registers[REGISTER_BYTE(EFLAGS_REGNUM)] = regs.pr_flags;
+  for (i = 0; i < FPA_NREGS; i++)
+    {
+      *(int *)&registers[REGISTER_BYTE(FP1_REGNUM+i)] =
+	regs.pr_fpa.fpa_regs[i];
+    }
+  memcpy (&registers[REGISTER_BYTE(ST0_REGNUM)], regs.pr_fpu.fpu_stack[0], 10);
+  memcpy (&registers[REGISTER_BYTE(ST1_REGNUM)], regs.pr_fpu.fpu_stack[1], 10);
+  memcpy (&registers[REGISTER_BYTE(ST2_REGNUM)], regs.pr_fpu.fpu_stack[2], 10);
+  memcpy (&registers[REGISTER_BYTE(ST3_REGNUM)], regs.pr_fpu.fpu_stack[3], 10);
+  memcpy (&registers[REGISTER_BYTE(ST4_REGNUM)], regs.pr_fpu.fpu_stack[4], 10);
+  memcpy (&registers[REGISTER_BYTE(ST5_REGNUM)], regs.pr_fpu.fpu_stack[5], 10);
+  memcpy (&registers[REGISTER_BYTE(ST6_REGNUM)], regs.pr_fpu.fpu_stack[6], 10);
+  memcpy (&registers[REGISTER_BYTE(ST7_REGNUM)], regs.pr_fpu.fpu_stack[7], 10);
+}
+
+/* FIXME:  This should be merged with i387-tdep.c as well. */
+static
+print_fpu_status(ep)
+struct pt_regset ep;
+{
+    int i;
+    int bothstatus;
+    int top;
+    int fpreg;
+    unsigned char *p;
+    
+    printf_unfiltered("80387:");
+    if (ep.pr_fpu.fpu_ip == 0) {
+	printf_unfiltered(" not in use.\n");
+	return;
+    } else {
+	printf_unfiltered("\n");
+    }
+    if (ep.pr_fpu.fpu_status != 0) {
+	print_387_status_word (ep.pr_fpu.fpu_status);
+    }
+    print_387_control_word (ep.pr_fpu.fpu_control);
+    printf_unfiltered ("last exception: ");
+    printf_unfiltered ("opcode 0x%x; ", ep.pr_fpu.fpu_rsvd4);
+    printf_unfiltered ("pc 0x%x:0x%x; ", ep.pr_fpu.fpu_cs, ep.pr_fpu.fpu_ip);
+    printf_unfiltered ("operand 0x%x:0x%x\n", ep.pr_fpu.fpu_data_offset, ep.pr_fpu.fpu_op_sel);
+    
+    top = (ep.pr_fpu.fpu_status >> 11) & 7;
+    
+    printf_unfiltered ("regno  tag  msb              lsb  value\n");
+    for (fpreg = 7; fpreg >= 0; fpreg--) 
+	{
+	    double val;
+	    
+	    printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : "  ", fpreg);
+	    
+	    switch ((ep.pr_fpu.fpu_tag >> (fpreg * 2)) & 3) 
+		{
+		case 0: printf_unfiltered ("valid "); break;
+		case 1: printf_unfiltered ("zero  "); break;
+		case 2: printf_unfiltered ("trap  "); break;
+		case 3: printf_unfiltered ("empty "); break;
+		}
+	    for (i = 9; i >= 0; i--)
+		printf_unfiltered ("%02x", ep.pr_fpu.fpu_stack[fpreg][i]);
+	    
+	    i387_to_double ((char *)ep.pr_fpu.fpu_stack[fpreg], (char *)&val);
+	    printf_unfiltered ("  %g\n", val);
+	}
+    if (ep.pr_fpu.fpu_rsvd1)
+	warning ("rsvd1 is 0x%x\n", ep.pr_fpu.fpu_rsvd1);
+    if (ep.pr_fpu.fpu_rsvd2)
+	warning ("rsvd2 is 0x%x\n", ep.pr_fpu.fpu_rsvd2);
+    if (ep.pr_fpu.fpu_rsvd3)
+	warning ("rsvd3 is 0x%x\n", ep.pr_fpu.fpu_rsvd3);
+    if (ep.pr_fpu.fpu_rsvd5)
+	warning ("rsvd5 is 0x%x\n", ep.pr_fpu.fpu_rsvd5);
+}
+
+
+print_1167_control_word(pcr)
+unsigned int pcr;
+
+{
+    int pcr_tmp;
+
+    pcr_tmp = pcr & FPA_PCR_MODE;
+    printf_unfiltered("\tMODE= %#x; RND= %#x ", pcr_tmp, pcr_tmp & 12);
+    switch (pcr_tmp & 12) {
+    case 0:
+	printf_unfiltered("RN (Nearest Value)");
+	break;
+    case 1:
+	printf_unfiltered("RZ (Zero)");
+	break;
+    case 2:
+	printf_unfiltered("RP (Positive Infinity)");
+	break;
+    case 3:
+	printf_unfiltered("RM (Negative Infinity)");
+	break;
+    }
+    printf_unfiltered("; IRND= %d ", pcr_tmp & 2);
+    if (0 == pcr_tmp & 2) {
+	printf_unfiltered("(same as RND)\n");
+    } else {
+	printf_unfiltered("(toward zero)\n");
+    }
+    pcr_tmp = pcr & FPA_PCR_EM;
+    printf_unfiltered("\tEM= %#x", pcr_tmp);
+    if (pcr_tmp & FPA_PCR_EM_DM) printf_unfiltered(" DM");
+    if (pcr_tmp & FPA_PCR_EM_UOM) printf_unfiltered(" UOM");
+    if (pcr_tmp & FPA_PCR_EM_PM) printf_unfiltered(" PM");
+    if (pcr_tmp & FPA_PCR_EM_UM) printf_unfiltered(" UM");
+    if (pcr_tmp & FPA_PCR_EM_OM) printf_unfiltered(" OM");
+    if (pcr_tmp & FPA_PCR_EM_ZM) printf_unfiltered(" ZM");
+    if (pcr_tmp & FPA_PCR_EM_IM) printf_unfiltered(" IM");
+    printf_unfiltered("\n");
+    pcr_tmp = FPA_PCR_CC;
+    printf_unfiltered("\tCC= %#x", pcr_tmp);
+    if (pcr_tmp & FPA_PCR_20MHZ) printf_unfiltered(" 20MHZ");
+    if (pcr_tmp & FPA_PCR_CC_Z) printf_unfiltered(" Z");
+    if (pcr_tmp & FPA_PCR_CC_C2) printf_unfiltered(" C2");
+
+    /* Dynix defines FPA_PCR_CC_C0 to 0x100 and ptx defines
+       FPA_PCR_CC_C1 to 0x100.  Use whichever is defined and assume
+       the OS knows what it is doing.  */
+#ifdef FPA_PCR_CC_C1
+    if (pcr_tmp & FPA_PCR_CC_C1) printf_unfiltered(" C1");
+#else
+    if (pcr_tmp & FPA_PCR_CC_C0) printf_unfiltered(" C0");
+#endif
+
+    switch (pcr_tmp)
+      {
+      case FPA_PCR_CC_Z:
+	printf_unfiltered(" (Equal)");
+	break;
+#ifdef FPA_PCR_CC_C1
+      case FPA_PCR_CC_C1:
+#else
+      case FPA_PCR_CC_C0:
+#endif
+	printf_unfiltered(" (Less than)");
+	break;
+      case 0:
+	printf_unfiltered(" (Greater than)");
+	break;
+      case FPA_PCR_CC_Z | 
+#ifdef FPA_PCR_CC_C1
+	FPA_PCR_CC_C1
+#else
+	FPA_PCR_CC_C0
+#endif
+	  | FPA_PCR_CC_C2:
+	printf_unfiltered(" (Unordered)");
+	break;
+      default:
+	printf_unfiltered(" (Undefined)");
+	break;
+      }
+    printf_unfiltered("\n");
+    pcr_tmp = pcr & FPA_PCR_AE;
+    printf_unfiltered("\tAE= %#x", pcr_tmp);
+    if (pcr_tmp & FPA_PCR_AE_DE) printf_unfiltered(" DE");
+    if (pcr_tmp & FPA_PCR_AE_UOE) printf_unfiltered(" UOE");
+    if (pcr_tmp & FPA_PCR_AE_PE) printf_unfiltered(" PE");
+    if (pcr_tmp & FPA_PCR_AE_UE) printf_unfiltered(" UE");
+    if (pcr_tmp & FPA_PCR_AE_OE) printf_unfiltered(" OE");
+    if (pcr_tmp & FPA_PCR_AE_ZE) printf_unfiltered(" ZE");
+    if (pcr_tmp & FPA_PCR_AE_EE) printf_unfiltered(" EE");
+    if (pcr_tmp & FPA_PCR_AE_IE) printf_unfiltered(" IE");
+    printf_unfiltered("\n");
+}
+
+print_1167_regs(regs)
+long regs[FPA_NREGS];
+
+{
+    int i;
+
+    union {
+	double	d;
+	long	l[2];
+    } xd;
+    union {
+	float	f;
+	long	l;
+    } xf;
+
+
+    for (i = 0; i < FPA_NREGS; i++) {
+	xf.l = regs[i];
+	printf_unfiltered("%%fp%d: raw= %#x, single= %f", i+1, regs[i], xf.f);
+	if (!(i & 1)) {
+	    printf_unfiltered("\n");
+	} else {
+	    xd.l[1] = regs[i];
+	    xd.l[0] = regs[i+1];
+	    printf_unfiltered(", double= %f\n", xd.d);
+	}
+    }
+}
+
+print_fpa_status(ep)
+struct pt_regset ep;
+
+{
+
+    printf_unfiltered("WTL 1167:");
+    if (ep.pr_fpa.fpa_pcr !=0) {
+	printf_unfiltered("\n");
+	print_1167_control_word(ep.pr_fpa.fpa_pcr);
+	print_1167_regs(ep.pr_fpa.fpa_regs);
+    } else {
+	printf_unfiltered(" not in use.\n");
+    }
+}
+
+#if 0 /* disabled because it doesn't go through the target vector.  */
+i386_float_info ()
+{
+  char ubuf[UPAGES*NBPG];
+  struct pt_regset regset;
+
+  if (have_inferior_p())
+    {
+      PTRACE_READ_REGS (inferior_pid, (PTRACE_ARG3_TYPE) &regset);
+    }
+  else
+    {
+      int corechan = bfd_cache_lookup (core_bfd);
+      if (lseek (corechan, 0, 0) < 0)
+	{
+	  perror ("seek on core file");
+	}
+      if (myread (corechan, ubuf, UPAGES*NBPG) < 0)
+	{
+	  perror ("read on core file");
+	}
+      /* only interested in the floating point registers */
+      regset.pr_fpu = ((struct user *) ubuf)->u_fpusave;
+      regset.pr_fpa = ((struct user *) ubuf)->u_fpasave;
+    }
+  print_fpu_status(regset);
+  print_fpa_status(regset);
+}
+#endif
+
+static volatile int got_sigchld;
+
+/*ARGSUSED*/
+/* This will eventually be more interesting. */
+void
+sigchld_handler(signo)
+	int signo;
+{
+	got_sigchld++;
+}
+
+/*
+ * Signals for which the default action does not cause the process
+ * to die.  See <sys/signal.h> for where this came from (alas, we
+ * can't use those macros directly)
+ */
+#ifndef sigmask
+#define sigmask(s) (1 << ((s) - 1))
+#endif
+#define SIGNALS_DFL_SAFE sigmask(SIGSTOP) | sigmask(SIGTSTP) | \
+	sigmask(SIGTTIN) | sigmask(SIGTTOU) | sigmask(SIGCHLD) | \
+	sigmask(SIGCONT) | sigmask(SIGWINCH) | sigmask(SIGPWR) | \
+	sigmask(SIGURG) | sigmask(SIGPOLL)
+
+#ifdef ATTACH_DETACH
+/*
+ * Thanks to XPT_MPDEBUGGER, we have to mange child_wait().
+ */
+int
+child_wait(pid, status)
+     int pid;
+     struct target_waitstatus *status;
+{
+  int save_errno, rv, xvaloff, saoff, sa_hand;
+  struct pt_stop pt;
+  struct user u;
+  sigset_t set;
+  /* Host signal number for a signal which the inferior terminates with, or
+     0 if it hasn't terminated due to a signal.  */
+  static int death_by_signal = 0;
+#ifdef SVR4_SHARED_LIBS		/* use this to distinguish ptx 2 vs ptx 4 */
+  prstatus_t pstatus;
+#endif
+
+  do {
+    set_sigint_trap();	/* Causes SIGINT to be passed on to the
+			   attached process. */
+    save_errno = errno;
+
+    got_sigchld = 0;
+
+    sigemptyset(&set);
+
+    while (got_sigchld == 0) {
+	    sigsuspend(&set);
+    }
+    
+    clear_sigint_trap();
+
+    rv = mptrace(XPT_STOPSTAT, 0, (char *)&pt, 0);
+    if (-1 == rv) {
+	    printf("XPT_STOPSTAT: errno %d\n", errno); /* DEBUG */
+	    continue;
+    }
+
+    pid = pt.ps_pid;
+
+    if (pid != inferior_pid) {
+	    /* NOTE: the mystery fork in csh/tcsh needs to be ignored.
+	     * We should not return new children for the initial run
+	     * of a process until it has done the exec.
+	     */
+	    /* inferior probably forked; send it on its way */
+	    rv = mptrace(XPT_UNDEBUG, pid, 0, 0);
+	    if (-1 == rv) {
+		    printf("child_wait: XPT_UNDEBUG: pid %d: %s\n", pid,
+			   safe_strerror(errno));
+	    }
+	    continue;
+    }
+    /* FIXME: Do we deal with fork notification correctly?  */
+    switch (pt.ps_reason) {
+    case PTS_FORK:
+	/* multi proc: treat like PTS_EXEC */
+	    /*
+	     * Pretend this didn't happen, since gdb isn't set up
+	     * to deal with stops on fork.
+	     */
+	    rv = ptrace(PT_CONTSIG, pid, 1, 0);
+	    if (-1 == rv) {
+		    printf("PTS_FORK: PT_CONTSIG: error %d\n", errno);
+	    }
+	    continue;
+    case PTS_EXEC:
+	    /*
+	     * Pretend this is a SIGTRAP.
+	     */
+	    status->kind = TARGET_WAITKIND_STOPPED;
+	    status->value.sig = TARGET_SIGNAL_TRAP;
+	    break;
+    case PTS_EXIT:
+	    /*
+	     * Note: we stop before the exit actually occurs.  Extract
+	     * the exit code from the uarea.  If we're stopped in the
+	     * exit() system call, the exit code will be in
+	     * u.u_ap[0].  An exit due to an uncaught signal will have
+	     * something else in here, see the comment in the default:
+	     * case, below.  Finally,let the process exit.
+	     */
+	    if (death_by_signal)
+	      {
+		status->kind = TARGET_WAITKIND_SIGNALED;
+		status->value.sig = target_signal_from_host (death_by_signal);
+		death_by_signal = 0;
+		break;
+	      }
+	    xvaloff = (unsigned long)&u.u_ap[0] - (unsigned long)&u;
+	    errno = 0;
+	    rv = ptrace(PT_RUSER, pid, (char *)xvaloff, 0);
+	    status->kind = TARGET_WAITKIND_EXITED;
+	    status->value.integer = rv;
+	    /*
+	     * addr & data to mptrace() don't matter here, since
+	     * the process is already dead.
+	     */
+	    rv = mptrace(XPT_UNDEBUG, pid, 0, 0);
+	    if (-1 == rv) {
+		    printf("child_wait: PTS_EXIT: XPT_UNDEBUG: pid %d error %d\n", pid,
+			   errno);
+	    }
+	    break;
+    case PTS_WATCHPT_HIT:
+	    fatal("PTS_WATCHPT_HIT\n");
+	    break;
+    default:
+	    /* stopped by signal */
+	    status->kind = TARGET_WAITKIND_STOPPED;
+	    status->value.sig = target_signal_from_host (pt.ps_reason);
+	    death_by_signal = 0;
+
+	    if (0 == (SIGNALS_DFL_SAFE & sigmask(pt.ps_reason))) {
+		    break;
+	    }
+	    /* else default action of signal is to die */
+#ifdef SVR4_SHARED_LIBS
+	    rv = ptrace(PT_GET_PRSTATUS, pid, (char *)&pstatus, 0);
+	    if (-1 == rv)
+		error("child_wait: signal %d PT_GET_PRSTATUS: %s\n",
+			pt.ps_reason, safe_strerror(errno));
+	    if (pstatus.pr_cursig != pt.ps_reason) {
+		printf("pstatus signal %d, pt signal %d\n",
+			pstatus.pr_cursig, pt.ps_reason);
+	    }
+	    sa_hand = (int)pstatus.pr_action.sa_handler;
+#else
+	    saoff = (unsigned long)&u.u_sa[0] - (unsigned long)&u;
+	    saoff += sizeof(struct sigaction) * (pt.ps_reason - 1);
+	    errno = 0;
+	    sa_hand = ptrace(PT_RUSER, pid, (char *)saoff, 0);
+	    if (errno)
+		    error("child_wait: signal %d: RUSER: %s\n",
+			   pt.ps_reason, safe_strerror(errno));
+#endif
+	    if ((int)SIG_DFL == sa_hand) {
+		    /* we will be dying */
+		    death_by_signal = pt.ps_reason;
+	    }
+	    break;
+    }
+
+  } while (pid != inferior_pid); /* Some other child died or stopped */
+
+  return pid;
+}
+#else /* !ATTACH_DETACH */
+/*
+ * Simple child_wait() based on inftarg.c child_wait() for use until
+ * the MPDEBUGGER child_wait() works properly.  This will go away when
+ * that is fixed.
+ */
+child_wait (pid, ourstatus)
+     int pid;
+     struct target_waitstatus *ourstatus;
+{
+  int save_errno;
+  int status;
+
+  do {
+    pid = wait (&status);
+    save_errno = errno;
+
+    if (pid == -1)
+      {
+	if (save_errno == EINTR)
+	  continue;
+	fprintf (stderr, "Child process unexpectedly missing: %s.\n",
+		 safe_strerror (save_errno));
+	ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
+	ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN;
+        return -1;
+      }
+  } while (pid != inferior_pid); /* Some other child died or stopped */
+  store_waitstatus (ourstatus, status);
+  return pid;
+}
+#endif /* ATTACH_DETACH */
+
+
+
+/* This function simply calls ptrace with the given arguments.  
+   It exists so that all calls to ptrace are isolated in this 
+   machine-dependent file. */
+int
+call_ptrace (request, pid, addr, data)
+     int request, pid;
+     PTRACE_ARG3_TYPE addr;
+     int data;
+{
+  return ptrace (request, pid, addr, data);
+}
+
+int
+call_mptrace(request, pid, addr, data)
+	int request, pid;
+	PTRACE_ARG3_TYPE addr;
+	int data;
+{
+	return mptrace(request, pid, addr, data);
+}
+
+#if defined (DEBUG_PTRACE)
+/* For the rest of the file, use an extra level of indirection */
+/* This lets us breakpoint usefully on call_ptrace. */
+#define ptrace call_ptrace
+#define mptrace call_mptrace
+#endif
+
+void
+kill_inferior ()
+{
+  if (inferior_pid == 0)
+    return;
+
+  /* For MPDEBUGGER, don't use PT_KILL, since the child will stop
+     again with a PTS_EXIT.  Just hit him with SIGKILL (so he stops)
+     and detach. */
+
+  kill (inferior_pid, SIGKILL);
+#ifdef ATTACH_DETACH
+  detach(SIGKILL);
+#else /* ATTACH_DETACH */
+  ptrace(PT_KILL, inferior_pid, 0, 0);
+  wait((int *)NULL);
+#endif /* ATTACH_DETACH */
+  target_mourn_inferior ();
+}
+
+/* Resume execution of the inferior process.
+   If STEP is nonzero, single-step it.
+   If SIGNAL is nonzero, give it that signal.  */
+
+void
+child_resume (pid, step, signal)
+     int pid;
+     int step;
+     enum target_signal signal;
+{
+  errno = 0;
+
+  if (pid == -1)
+    pid = inferior_pid;
+
+  /* An address of (PTRACE_ARG3_TYPE)1 tells ptrace to continue from where
+     it was.  (If GDB wanted it to start some other way, we have already
+     written a new PC value to the child.)
+
+     If this system does not support PT_SSTEP, a higher level function will
+     have called single_step() to transmute the step request into a
+     continue request (by setting breakpoints on all possible successor
+     instructions), so we don't have to worry about that here.  */
+
+  if (step)
+    ptrace (PT_SSTEP,     pid, (PTRACE_ARG3_TYPE) 1, signal);
+  else
+    ptrace (PT_CONTSIG, pid, (PTRACE_ARG3_TYPE) 1, signal);
+
+  if (errno)
+    perror_with_name ("ptrace");
+}
+
+#ifdef ATTACH_DETACH
+/* Start debugging the process whose number is PID.  */
+int
+attach (pid)
+     int pid;
+{
+	sigset_t set;
+	int rv;
+
+	rv = mptrace(XPT_DEBUG, pid, 0, 0);
+	if (-1 == rv) {
+		error("mptrace(XPT_DEBUG): %s", safe_strerror(errno));
+	}
+	rv = mptrace(XPT_SIGNAL, pid, 0, SIGSTOP);
+	if (-1 == rv) {
+		error("mptrace(XPT_SIGNAL): %s", safe_strerror(errno));
+	}
+	attach_flag = 1;
+	return pid;
+}
+
+void
+detach (signo)
+     int signo;
+{
+	int rv;
+
+	rv = mptrace(XPT_UNDEBUG, inferior_pid, 1, signo);
+	if (-1 == rv) {
+		error("mptrace(XPT_UNDEBUG): %s", safe_strerror(errno));
+	}
+	attach_flag = 0;
+}
+
+#endif /* ATTACH_DETACH */
+
+/* Default the type of the ptrace transfer to int.  */
+#ifndef PTRACE_XFER_TYPE
+#define PTRACE_XFER_TYPE int
+#endif
+
+
+/* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
+   in the NEW_SUN_PTRACE case.
+   It ought to be straightforward.  But it appears that writing did
+   not write the data that I specified.  I cannot understand where
+   it got the data that it actually did write.  */
+
+/* Copy LEN bytes to or from inferior's memory starting at MEMADDR
+   to debugger memory starting at MYADDR.   Copy to inferior if
+   WRITE is nonzero.
+  
+   Returns the length copied, which is either the LEN argument or zero.
+   This xfer function does not do partial moves, since child_ops
+   doesn't allow memory operations to cross below us in the target stack
+   anyway.  */
+
+int
+child_xfer_memory (memaddr, myaddr, len, write, target)
+     CORE_ADDR memaddr;
+     char *myaddr;
+     int len;
+     int write;
+     struct target_ops *target;		/* ignored */
+{
+  register int i;
+  /* Round starting address down to longword boundary.  */
+  register CORE_ADDR addr = memaddr & - sizeof (PTRACE_XFER_TYPE);
+  /* Round ending address up; get number of longwords that makes.  */
+  register int count
+    = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1)
+      / sizeof (PTRACE_XFER_TYPE);
+  /* Allocate buffer of that many longwords.  */
+  register PTRACE_XFER_TYPE *buffer
+    = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE));
+
+  if (write)
+    {
+      /* Fill start and end extra bytes of buffer with existing memory data.  */
+
+      if (addr != memaddr || len < (int) sizeof (PTRACE_XFER_TYPE)) {
+	/* Need part of initial word -- fetch it.  */
+        buffer[0] = ptrace (PT_RTEXT, inferior_pid, (PTRACE_ARG3_TYPE) addr,
+			    0);
+      }
+
+      if (count > 1)		/* FIXME, avoid if even boundary */
+	{
+	  buffer[count - 1]
+	    = ptrace (PT_RTEXT, inferior_pid,
+		      ((PTRACE_ARG3_TYPE)
+		       (addr + (count - 1) * sizeof (PTRACE_XFER_TYPE))),
+		      0);
+	}
+
+      /* Copy data to be written over corresponding part of buffer */
+
+      memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)),
+	      myaddr,
+	      len);
+
+      /* Write the entire buffer.  */
+
+      for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
+	{
+	  errno = 0;
+	  ptrace (PT_WDATA, inferior_pid, (PTRACE_ARG3_TYPE) addr,
+		  buffer[i]);
+	  if (errno)
+	    {
+	      /* Using the appropriate one (I or D) is necessary for
+		 Gould NP1, at least.  */
+	      errno = 0;
+	      ptrace (PT_WTEXT, inferior_pid, (PTRACE_ARG3_TYPE) addr,
+		      buffer[i]);
+	    }
+	  if (errno)
+	    return 0;
+	}
+    }
+  else
+    {
+      /* Read all the longwords */
+      for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
+	{
+	  errno = 0;
+	  buffer[i] = ptrace (PT_RTEXT, inferior_pid,
+			      (PTRACE_ARG3_TYPE) addr, 0);
+	  if (errno)
+	    return 0;
+	  QUIT;
+	}
+
+      /* Copy appropriate bytes out of the buffer.  */
+      memcpy (myaddr,
+	      (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)),
+	      len);
+    }
+  return len;
+}
+
+
+void
+_initialize_symm_nat ()
+{
+#ifdef ATTACH_DETACH
+/*
+ * the MPDEBUGGER is necessary for process tree debugging and attach
+ * to work, but it alters the behavior of debugged processes, so other
+ * things (at least child_wait()) will have to change to accomodate
+ * that.
+ *
+ * Note that attach is not implemented in dynix 3, and not in ptx
+ * until version 2.1 of the OS.
+ */
+	int rv;
+	sigset_t set;
+	struct sigaction sact;
+
+	rv = mptrace(XPT_MPDEBUGGER, 0, 0, 0);
+	if (-1 == rv) {
+		fatal("_initialize_symm_nat(): mptrace(XPT_MPDEBUGGER): %s",
+		      safe_strerror(errno));
+	}
+
+	/*
+	 * Under MPDEBUGGER, we get SIGCLHD when a traced process does
+	 * anything of interest.
+	 */
+
+	/*
+	 * Block SIGCHLD.  We leave it blocked all the time, and then
+	 * call sigsuspend() in child_wait() to wait for the child
+	 * to do something.  None of these ought to fail, but check anyway.
+	 */
+	sigemptyset(&set);
+	rv = sigaddset(&set, SIGCHLD);
+	if (-1 == rv) {
+		fatal("_initialize_symm_nat(): sigaddset(SIGCHLD): %s",
+		      safe_strerror(errno));
+	}
+	rv = sigprocmask(SIG_BLOCK, &set, (sigset_t *)NULL);
+	if (-1 == rv) {
+		fatal("_initialize_symm_nat(): sigprocmask(SIG_BLOCK): %s",
+		      safe_strerror(errno));
+	}
+
+	sact.sa_handler = sigchld_handler;
+	sigemptyset(&sact.sa_mask);
+	sact.sa_flags = SA_NOCLDWAIT; /* keep the zombies away */
+	rv = sigaction(SIGCHLD, &sact, (struct sigaction *)NULL);
+	if (-1 == rv) {
+		fatal("_initialize_symm_nat(): sigaction(SIGCHLD): %s",
+		      safe_strerror(errno));
+	}
+#endif
+}