new file

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diff --git a/gdb/i386aix-nat.c b/gdb/i386aix-nat.c
new file mode 100644
index 0000000..6b4297f
--- /dev/null
+++ b/gdb/i386aix-nat.c
@@ -0,0 +1,338 @@
+/* Intel 386 native support.
+   Copyright (C) 1988, 1989, 1991, 1992 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 "defs.h"
+#include "frame.h"
+#include "inferior.h"
+#include "language.h"
+#include "gdbcore.h"
+
+#ifdef USG
+#include <sys/types.h>
+#endif
+
+#include <sys/param.h>
+#include <sys/dir.h>
+#include <signal.h>
+#include <sys/user.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+
+#include <sys/file.h>
+#include <sys/stat.h>
+
+#include <stddef.h>
+#include <sys/ptrace.h>
+
+/* Does AIX define this in <errno.h>?  */
+extern int errno;
+
+#ifndef NO_SYS_REG_H
+#include <sys/reg.h>
+#endif
+
+#include "ieee-float.h"
+
+#include "target.h"
+
+extern struct ext_format ext_format_i387;
+
+/* this table must line up with REGISTER_NAMES in tm-i386v.h */
+/* symbols like 'EAX' come from <sys/reg.h> */
+static int regmap[] = 
+{
+  EAX, ECX, EDX, EBX,
+  USP, EBP, ESI, EDI,
+  EIP, EFL, CS, SS,
+  DS, ES, FS, GS,
+};
+
+/* blockend is the value of u.u_ar0, and points to the
+ * place where GS is stored
+ */
+
+int
+i386_register_u_addr (blockend, regnum)
+     int blockend;
+     int regnum;
+{
+#if 0
+  /* this will be needed if fp registers are reinstated */
+  /* for now, you can look at them with 'info float'
+   * sys5 wont let you change them with ptrace anyway
+   */
+  if (regnum >= FP0_REGNUM && regnum <= FP7_REGNUM) 
+    {
+      int ubase, fpstate;
+      struct user u;
+      ubase = blockend + 4 * (SS + 1) - KSTKSZ;
+      fpstate = ubase + ((char *)&u.u_fpstate - (char *)&u);
+      return (fpstate + 0x1c + 10 * (regnum - FP0_REGNUM));
+    } 
+  else
+#endif
+    return (blockend + 4 * regmap[regnum]);
+  
+}
+
+/* The code below only work on the aix ps/2 (i386-ibm-aix) -
+ * mtranle@paris - Sat Apr 11 10:34:12 1992
+ */
+
+struct env387 
+{
+  unsigned short control;
+  unsigned short r0;
+  unsigned short status;
+  unsigned short r1;
+  unsigned short tag;
+  unsigned short r2;
+  unsigned long eip;
+  unsigned short code_seg;
+  unsigned short opcode;
+  unsigned long operand;
+  unsigned short operand_seg;
+  unsigned short r3;
+  unsigned char regs[8][10];
+};
+
+static
+print_387_status (status, ep)
+     unsigned short status;
+     struct env387 *ep;
+{
+  int i;
+  int bothstatus;
+  int top;
+  int fpreg;
+  unsigned char *p;
+  
+  bothstatus = ((status != 0) && (ep->status != 0));
+  if (status != 0) 
+    {
+      if (bothstatus)
+	printf ("u: ");
+      print_387_status_word (status);
+    }
+  
+  if (ep->status != 0) 
+    {
+      if (bothstatus)
+	printf ("e: ");
+      print_387_status_word (ep->status);
+    }
+  
+  print_387_control_word (ep->control);
+  printf ("last exception: ");
+  printf ("opcode %s; ", local_hex_string(ep->opcode));
+  printf ("pc %s:", local_hex_string(ep->code_seg));
+  printf ("%s; ", local_hex_string(ep->eip));
+  printf ("operand %s", local_hex_string(ep->operand_seg));
+  printf (":%s\n", local_hex_string(ep->operand));
+  
+  top = 7- ((ep->status >> 11) & 7);
+  
+  printf ("regno  tag  msb              lsb  value\n");
+  for (fpreg = 7; fpreg >= 0; fpreg--) 
+    {
+      double val;
+      
+      printf ("%s %d: ", fpreg == top ? "=>" : "  ", fpreg);
+      
+      switch ((ep->tag >> ((7 - fpreg) * 2)) & 3) 
+	{
+	case 0: printf ("valid "); break;
+	case 1: printf ("zero  "); break;
+	case 2: printf ("trap  "); break;
+	case 3: printf ("empty "); break;
+	}
+      for (i = 9; i >= 0; i--)
+	printf ("%02x", ep->regs[fpreg][i]);
+      
+      i387_to_double ((char *)ep->regs[fpreg], (char *)&val);
+      printf ("  %#g\n", val);
+    }
+}
+
+static struct env387 core_env387;
+
+void
+i386_float_info ()
+{
+  struct env387 fps;
+  int fpsaved = 0;
+
+  if (inferior_pid)
+    {
+      char buf[10];
+      unsigned short status;
+
+      ptrace (PT_READ_FPR, inferior_pid, buf, offsetof(struct env387, status));
+      memcpy (&status, buf, sizeof (status));
+      fpsaved = status;
+    }
+  else
+    {
+      if ((fpsaved = core_env387.status) != 0)
+	memcpy(&fps, &core_env387, sizeof(fps));
+    }
+  
+  if (fpsaved == 0) 
+    {
+      printf ("no floating point status saved\n");
+      return;
+    }
+
+  if (inferior_pid)
+    {
+      int offset;
+      for (offset = 0; offset < sizeof(fps); offset += 10)
+	{
+	  char buf[10];
+	  ptrace (PT_READ_FPR, inferior_pid, buf, offset);
+	  memcpy ((char *)&fps.control + offset, buf,
+		  MIN(10, sizeof(fps) - offset));
+	}
+    } 
+
+  print_387_status (0, (struct env387 *)&fps);
+}
+
+/* Fetch one register.  */
+static void
+fetch_register (regno)
+     int regno;
+{
+  char buf[MAX_REGISTER_RAW_SIZE];
+  if (regno < FP0_REGNUM)
+    *(int *)buf = ptrace (PT_READ_GPR, inferior_pid,
+			  PT_REG(regmap[regno]), 0, 0);
+  else
+    ptrace (PT_READ_FPR, inferior_pid, buf,
+	    (regno - FP0_REGNUM)*10 + offsetof(struct env387, regs));
+  supply_register (regno, buf);
+}
+
+void
+fetch_inferior_registers (regno)
+     int regno;
+{
+  if (regno < 0)
+    for (regno = 0; regno < NUM_REGS; regno++)
+      fetch_register (regno);
+  else
+    fetch_register (regno);
+}
+
+/* store one register */
+static void
+store_register (regno)
+     int regno;
+{
+  char buf[80];
+  extern char registers[];
+  errno = 0;
+  if (regno < FP0_REGNUM)
+    ptrace (PT_WRITE_GPR, inferior_pid, PT_REG(regmap[regno]),
+	    *(int *) &registers[REGISTER_BYTE (regno)], 0);
+  else
+    ptrace (PT_WRITE_FPR, inferior_pid, &registers[REGISTER_BYTE (regno)],
+	    (regno - FP0_REGNUM)*10 + offsetof(struct env387, regs));
+
+  if (errno != 0)
+    {
+      sprintf (buf, "writing register number %d", regno);
+      perror_with_name (buf);
+    }
+}
+
+/* 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 (regno)
+     int regno;
+{
+  if (regno < 0)
+    for (regno = 0; regno < NUM_REGS; regno++)
+      store_register (regno);
+  else
+    store_register (regno);
+}
+
+#ifndef CD_AX			/* defined in sys/i386/coredump.h */
+# define CD_AX	0
+# define CD_BX	1
+# define CD_CX	2
+# define CD_DX	3
+# define CD_SI	4
+# define CD_DI	5
+# define CD_BP	6
+# define CD_SP	7
+# define CD_FL	8
+# define CD_IP	9
+# define CD_CS	10
+# define CD_DS	11
+# define CD_ES	12
+# define CD_FS	13
+# define CD_GS	14
+# define CD_SS	15
+#endif
+
+/*
+ * The order here in core_regmap[] has to be the same as in 
+ * regmap[] above.
+ */
+static int core_regmap[] = 
+{
+  CD_AX, CD_CX, CD_DX, CD_BX,
+  CD_SP, CD_BP, CD_SI, CD_DI,
+  CD_IP, CD_FL, CD_CS, CD_SS,
+  CD_DS, CD_ES, CD_FS, CD_GS,
+};
+
+void
+fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
+     char *core_reg_sect;
+     unsigned core_reg_size;
+     int which;
+     unsigned int reg_addr;	/* ignored */
+{
+
+  if (which == 0)
+    {
+      /* Integer registers */
+
+#define cd_regs(n) ((int *)core_reg_sect)[n]
+#define regs(n) *((int *) &registers[REGISTER_BYTE (n)])
+
+      int i;
+      for (i = 0; i < FP0_REGNUM; i++)
+	regs(i) = cd_regs(core_regmap[i]);
+    }
+  else if (which == 2)
+    {
+      /* Floating point registers */
+
+      if (core_reg_size >= sizeof (core_env387))
+	memcpy (&core_env387, core_reg_sect, core_reg_size);
+      else
+	fprintf (stderr, "Couldn't read float regs from core file\n");
+    }
+}