1 files changed, 345 insertions, 0 deletions
diff --git a/gdb/gdbserver/low-lynx.c b/gdb/gdbserver/low-lynx.c
new file mode 100644
index 0000000..44070c5
--- /dev/null
+++ b/gdb/gdbserver/low-lynx.c
@@ -0,0 +1,345 @@
+/* Low level interface to ptrace, for the remote server for GDB.
+   Copyright (C) 1986, 1987, 1993 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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#include "server.h"
+#include "frame.h"
+#include "inferior.h"
+
+#include <stdio.h>
+#include <sys/param.h>
+#include <sys/dir.h>
+#define LYNXOS
+#include <sys/mem.h>
+#include <sys/signal.h>
+#include <sys/file.h>
+#include <sys/kernel.h>
+#include <sys/itimer.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+#include <sys/proc.h>
+#include <signal.h>
+#include <sys/ioctl.h>
+#include <sgtty.h>
+#include <fcntl.h>
+#include "/usr/include/wait.h"
+
+char registers[REGISTER_BYTES];
+
+#include <sys/ptrace.h>
+
+/* Start an inferior process and returns its pid.
+   ALLARGS is a vector of program-name and args. */
+
+int
+create_inferior (program, allargs)
+     char *program;
+     char **allargs;
+{
+  int pid;
+
+  pid = fork ();
+  if (pid < 0)
+    perror_with_name ("fork");
+
+  if (pid == 0)
+    {
+      int pgrp;
+
+      /* Switch child to it's own process group so that signals won't
+	 directly affect gdbserver. */
+
+      pgrp = getpid();
+      setpgrp(0, pgrp);
+      ioctl (0, TIOCSPGRP, &pgrp);
+
+      ptrace (PTRACE_TRACEME);
+
+      execv (program, allargs);
+
+      fprintf (stderr, "GDBserver (process %d):  Cannot exec %s: %s.\n",
+	       getpid(), program,
+	       errno < sys_nerr ? sys_errlist[errno] : "unknown error");
+      fflush (stderr);
+      _exit (0177);
+    }
+
+  return pid;
+}
+
+/* Kill the inferior process.  Make us have no inferior.  */
+
+void
+kill_inferior ()
+{
+  if (inferior_pid == 0)
+    return;
+  ptrace (PTRACE_KILL, inferior_pid, 0, 0);
+  wait (0);
+
+  inferior_pid = 0;
+}
+
+/* Wait for process, returns status */
+
+unsigned char
+mywait (status)
+     char *status;
+{
+  int pid;
+  union wait w;
+
+  enable_async_io();
+
+  pid = wait (&w);
+
+  disable_async_io();
+
+  if (pid != PIDGET(inferior_pid))
+    perror_with_name ("wait");
+
+  inferior_pid = BUILDPID (inferior_pid, w.w_tid);
+
+  if (WIFEXITED (w))
+    {
+      fprintf (stderr, "\nChild exited with status %d\n", WEXITSTATUS (w));
+      fprintf (stderr, "GDBserver exiting\n");
+      exit (0);
+    }
+  else if (!WIFSTOPPED (w))
+    {
+      fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w));
+      *status = 'T';
+      return ((unsigned char) WTERMSIG (w));
+    }
+
+  fetch_inferior_registers (0);
+
+  *status = 'S';
+  return ((unsigned char) WSTOPSIG (w));
+}
+
+/* Resume execution of the inferior process.
+   If STEP is nonzero, single-step it.
+   If SIGNAL is nonzero, give it that signal.  */
+
+void
+myresume (step, signal)
+     int step;
+     int signal;
+{
+  errno = 0;
+  ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, inferior_pid, 1, signal);
+  if (errno)
+    perror_with_name ("ptrace");
+}
+
+#undef offsetof
+#define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
+
+static struct econtext *
+lynx_registers_addr()
+{
+  st_t *stblock;
+  int ecpoff = offsetof(st_t, ecp);
+  CORE_ADDR ecp;
+
+  errno = 0;
+  stblock = (st_t *) ptrace (PTRACE_THREADUSER, inferior_pid,
+			     (PTRACE_ARG3_TYPE)0, 0);
+  if (errno)
+    perror_with_name ("PTRACE_THREADUSER");
+
+  ecp = (CORE_ADDR) ptrace (PTRACE_PEEKTHREAD, inferior_pid,
+			    (PTRACE_ARG3_TYPE)ecpoff, 0);
+  ecp -= (CORE_ADDR)stblock;
+  if (errno)
+    perror_with_name ("lynx_registers_addr(PTRACE_PEEKTHREAD)");
+
+  return (struct econtext *)ecp;
+}
+
+static struct econtext *ecp;
+
+/* Mapping between GDB register #s and offsets into econtext.  Must be
+   consistent with REGISTER_NAMES macro in tm-i386v.h. */
+
+#define X(ENTRY)(offsetof(struct econtext, ENTRY) / 4)
+static int regmap[] = {
+  X(eax),
+  X(ecx),
+  X(edx),
+  X(ebx),
+  X(esp),
+  X(ebp),
+  X(esi),
+  X(edi),
+  X(eip),
+  X(flags),			/* ps */
+  X(cs),
+  X(ss),
+  X(ds),
+  X(es),
+  X(ecode),			/* Lynx doesn't give us either fs or gs, so */
+  X(fault)			/* we just substitute these two in the hopes
+				   that they are useful. */
+  };
+
+/* Fetch one or more registers from the inferior.  REGNO == -1 to get
+   them all.  We actually fetch more than requested, when convenient,
+   marking them as valid so we won't fetch them again.  */
+
+void
+fetch_inferior_registers (ignored)
+     int ignored;
+{
+  int regno;
+  unsigned long reg;
+  struct econtext *ecp;
+
+  ecp = lynx_registers_addr();
+
+  for (regno = 0; regno < NUM_REGS; regno++)
+    {
+      errno = 0;
+      reg = ptrace (PTRACE_PEEKTHREAD, inferior_pid,
+		    (PTRACE_ARG3_TYPE) (&ecp->fault + regmap[regno]), 0);
+      if (errno)
+	perror_with_name ("fetch_inferior_registers(PTRACE_PEEKTHREAD)");
+  
+      *(unsigned long *)&registers[REGISTER_BYTE (regno)] = reg;
+    }
+}
+
+/* Store our register values back into the inferior.
+   If REGNO is -1, do this for all registers.
+   Otherwise, REGNO specifies which register (so we can save time).  */
+
+void
+store_inferior_registers (ignored)
+     int ignored;
+{
+  int regno;
+  unsigned long reg;
+  struct econtext *ecp;
+
+  ecp = lynx_registers_addr();
+
+  for (regno = 0; regno < NUM_REGS; regno++)
+    {
+      reg = *(unsigned long *)&registers[REGISTER_BYTE (regno)];
+
+      errno = 0;
+      ptrace (PTRACE_POKEUSER, inferior_pid,
+	      (PTRACE_ARG3_TYPE) (&ecp->fault + regmap[regno]), reg);
+      if (errno)
+	perror_with_name ("PTRACE_POKEUSER");
+    }
+}
+
+/* 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 from inferior's memory starting at MEMADDR
+   to debugger memory starting at MYADDR.  */
+
+void
+read_inferior_memory (memaddr, myaddr, len)
+     CORE_ADDR memaddr;
+     char *myaddr;
+     int len;
+{
+  register int i;
+  /* Round starting address down to longword boundary.  */
+  register CORE_ADDR addr = memaddr & -sizeof (int);
+  /* Round ending address up; get number of longwords that makes.  */
+  register int count
+  = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
+  /* Allocate buffer of that many longwords.  */
+  register int *buffer = (int *) alloca (count * sizeof (int));
+
+  /* Read all the longwords */
+  for (i = 0; i < count; i++, addr += sizeof (int))
+    {
+      buffer[i] = ptrace (PTRACE_PEEKTEXT, inferior_pid, addr, 0);
+    }
+
+  /* Copy appropriate bytes out of the buffer.  */
+  bcopy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len);
+}
+
+/* Copy LEN bytes of data from debugger memory at MYADDR
+   to inferior's memory at MEMADDR.
+   On failure (cannot write the inferior)
+   returns the value of errno.  */
+
+int
+write_inferior_memory (memaddr, myaddr, len)
+     CORE_ADDR memaddr;
+     char *myaddr;
+     int len;
+{
+  register int i;
+  /* Round starting address down to longword boundary.  */
+  register CORE_ADDR addr = memaddr & -sizeof (int);
+  /* Round ending address up; get number of longwords that makes.  */
+  register int count
+  = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
+  /* Allocate buffer of that many longwords.  */
+  register int *buffer = (int *) alloca (count * sizeof (int));
+  extern int errno;
+
+  /* Fill start and end extra bytes of buffer with existing memory data.  */
+
+  buffer[0] = ptrace (PTRACE_PEEKTEXT, inferior_pid, addr, 0);
+
+  if (count > 1)
+    {
+      buffer[count - 1]
+	= ptrace (PTRACE_PEEKTEXT, inferior_pid,
+		  addr + (count - 1) * sizeof (int), 0);
+    }
+
+  /* Copy data to be written over corresponding part of buffer */
+
+  bcopy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len);
+
+  /* Write the entire buffer.  */
+
+  for (i = 0; i < count; i++, addr += sizeof (int))
+    {
+      while (1)
+	{
+	  errno = 0;
+	  ptrace (PTRACE_POKETEXT, inferior_pid, addr, buffer[i]);
+	  if (errno)
+	    {
+	      fprintf(stderr, "ptrace (PTRACE_POKETEXT): errno=%d, inferior_pid=0x%x, addr=0x%x, buffer[i] = 0x%x\n", errno, inferior_pid, addr, buffer[i]);
+	      fprintf(stderr, "Sleeping for 1 second\n");
+	      sleep(1);
+	    }
+	  else
+	    break;
+	}
+    }
+
+  return 0;
+}