New interix-specific files:

* config/i386/nm-interix.h: New file.
       * config/i386/interix.mh: New file.
       * config/i386/interix.mt: New file.
       * i386-interix-nat.c: New file.
       * i386-interix-tdep.c: New file.

gdb/i386-interix-nat.c

@@ -0,0 +1,190 @@
+/* Native-dependent code for Interix running on i386's, for GDB.
+   Copyright 2002 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.  */
+
+#include "defs.h"
+
+#include <sys/procfs.h>
+#include <inferior.h>
+#include <fcntl.h>
+
+#include <i386-tdep.h>
+#include "gdb_string.h"
+#include "gdbcore.h"
+#include "gregset.h"
+#include "regcache.h"
+
+typedef unsigned long greg_t;
+
+/* This is a duplicate of the table in i386-linux-nat.c.  */
+
+static int regmap[] = {
+  EAX, ECX, EDX, EBX,
+  UESP, EBP, ESI, EDI,
+  EIP, EFL, CS, SS,
+  DS, ES, FS, GS,
+};
+
+/* Forward declarations.  */
+extern void _initialize_core_interix (void);
+extern initialize_file_ftype _initialize_core_interix;
+
+/*  Given a pointer to a general register set in /proc format (gregset_t *),
+    unpack the register contents and supply them as gdb's idea of the current
+    register values.  */
+
+void
+supply_gregset (gregset_t *gregsetp)
+{
+  int regi;
+  greg_t *regp = (greg_t *) & gregsetp->gregs;
+
+  for (regi = 0; regi < I386_NUM_GREGS; regi++)
+    {
+      supply_register (regi, (char *) (regp + regmap[regi]));
+    }
+}
+
+/* Store GDB's value for REGNO in *GREGSETP.  If REGNO is -1, do all
+   of them.  */
+
+void
+fill_gregset (gregset_t *gregsetp, int regno)
+{
+  int regi;
+  greg_t *regp = (greg_t *) gregsetp->gregs;
+
+  for (regi = 0; regi < I386_NUM_GREGS; regi++)
+    if (regno == -1 || regi == regno)
+      regcache_collect (regi, (void *) (regp + regmap[regi]));
+}
+
+/* Fill GDB's register file with the floating-point register values in
+   *FPREGSETP.  */
+
+void
+supply_fpregset (fpregset_t *fpregsetp)
+{
+  i387_supply_fsave ((char *) fpregsetp);
+}
+
+/* Given a pointer to a floating point register set in (fpregset_t *)
+   format, update all of the registers from gdb's idea of the current
+   floating point register set.  */
+
+void
+fill_fpregset (fpregset_t *fpregsetp, int regno)
+{
+  i387_fill_fsave ((char *) fpregsetp, regno);
+}
+
+/* Read the values of either the general register set (WHICH equals 0)
+   or the floating point register set (WHICH equals 2) from the core
+   file data (pointed to by CORE_REG_SECT), and update gdb's idea of
+   their current values.  The CORE_REG_SIZE parameter is compared to
+   the size of the gregset or fpgregset structures (as appropriate) to
+   validate the size of the structure from the core file.  The
+   REG_ADDR parameter is ignored.  */
+
+static void
+fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which,
+                      CORE_ADDR reg_addr)
+{
+  gdb_gregset_t gregset;
+  gdb_fpregset_t fpregset;
+
+  if (which == 0)
+    {
+      if (core_reg_size != sizeof (gregset))
+        {
+          warning ("wrong size gregset struct in core file");
+        }
+      else
+        {
+          memcpy ((char *) &gregset, core_reg_sect, sizeof (gregset));
+          supply_gregset (&gregset);
+        }
+    }
+  else if (which == 2)
+    {
+      if (core_reg_size != sizeof (fpregset))
+        {
+          warning ("wrong size fpregset struct in core file");
+        }
+      else
+        {
+          memcpy ((char *) &fpregset, core_reg_sect, sizeof (fpregset));
+          supply_fpregset (&fpregset);
+        }
+    }
+}
+
+#include <setjmp.h>
+
+static struct core_fns interix_core_fns =
+{
+  bfd_target_coff_flavour,      /* core_flavour (more or less) */
+  default_check_format,         /* check_format */
+  default_core_sniffer,         /* core_sniffer */
+  fetch_core_registers,         /* core_read_registers */
+  NULL                          /* next */
+};
+
+void
+_initialize_core_interix (void)
+{
+  add_core_fns (&interix_core_fns);
+}
+
+/* We don't have a /proc/pid/file or /proc/pid/exe to read a link from,
+   so read it from the same place ps gets the name.  */
+
+char *
+child_pid_to_exec_file (int pid)
+{
+  char *path;
+  char *buf;
+  int fd, c;
+  char *p;
+
+  xasprintf (&path, "/proc/%d/stat", pid);
+  buf = xcalloc (MAXPATHLEN + 1, sizeof (char));
+  make_cleanup (xfree, path);
+  make_cleanup (xfree, buf);
+
+  fd = open (path, O_RDONLY);
+
+  if (fd < 0)
+    return NULL;
+
+  /* Skip over "Argv0\t".  */
+  lseek (fd, 6, SEEK_SET);
+
+  c = read (fd, buf, MAXPATHLEN);
+  close (fd);
+
+  if (c < 0)
+    return NULL;
+
+  buf[c] = '\0';                /* Ensure null termination.  */
+  p = strchr (buf, '\n');
+  if (p != NULL)
+    *p = '\0';
+
+  return buf;
+}