Add to go32-nat.c the code from coming DJGPP version

[Robert Hoehne <robert.hoehne@gmx.net>]

This patch for go32-nat.c (which is not yet part of the official
gdb snapshots) adds some code, which will be available in the
next DJGPP version. For now it is enclosed in a conditional
checking the DJGPP version.

Additionally I added the decls of all static function near the beginning
of the file.

This patch is against "a March 10th snapshot from DJ"
which I got from DJ Delorie.

Sun Mar 14 1999 Robert Hoehne <robert.hoehne@gmx.net>

	* go32-nat.c: Add code for the FPU saving/restoring and adding
		decls for all static functions

--- gdb-snap-march-10th-from-DJ/gdb/go32-nat.c.orig	Thu Mar 11 19:56:56 1999
+++ gdb-snap-march-10th-from-DJ/gdb/go32-nat.c	Sun Mar 14 16:28:42 1999
@@ -29,12 +29,72 @@
 #include "command.h"
 #include "floatformat.h"
 
+#include <stdio.h>	/* required for __DJGPP_MINOR__ */
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 #include <debug/v2load.h>
 #include <debug/dbgcom.h>
 
+#if __DJGPP_MINOR__ < 3
+/* This code will be provided from DJGPP 2.03 on. Until then I code it
+   here */
+typedef struct {
+  unsigned short sig0;
+  unsigned short sig1;
+  unsigned short sig2;
+  unsigned short sig3;
+  unsigned short exponent:15;
+  unsigned short sign:1;
+} NPXREG;
+
+typedef struct {
+  unsigned int control;
+  unsigned int status;
+  unsigned int tag;
+  unsigned int eip;
+  unsigned int cs;
+  unsigned int dataptr;
+  unsigned int datasel;
+  NPXREG reg[8];
+} NPX;
+
+static NPX npx;
+
+static void save_npx (void); /* Save the FPU of the debugged program */
+static void load_npx (void); /* Restore the FPU of the debugged program */
+
+/* ------------------------------------------------------------------------- */
+/* Store the contents of the NPX in the global variable `npx'.  */
+
+static void
+save_npx (void)
+{
+  asm ("inb	$0xa0, %%al
+	testb	$0x20, %%al
+	jz	1f
+	xorb	%%al, %%al
+	outb	%%al, $0xf0
+	movb	$0x20, %%al
+	outb	%%al, $0xa0
+	outb	%%al, $0x20
+1:
+	fnsave	%0
+	fwait"
+       : "=m" (npx)
+       : /* No input */
+       : "%eax");
+}
+/* ------------------------------------------------------------------------- */
+/* Reload the contents of the NPX from the global variable `npx'.  */
+
+static void
+load_npx (void)
+{
+  asm ("frstor %0" : "=m" (npx));
+}
+#endif /* __DJGPP_MINOR < 3 */
+
 extern void _initialize_go32_nat (void);
 
 struct env387
@@ -58,9 +118,54 @@
 
 #define SOME_PID 42
 
-/* FIXME add decls of all static functions here */
-
 static int prog_has_started = 0;
+static void
+print_387_status (unsigned short status, struct env387 *ep);
+static void
+go32_open (char *name, int from_tty);
+static void
+go32_close (int quitting);
+static void
+go32_attach (char *args, int from_tty);
+static void
+go32_detach (char *args, int from_tty);
+static void
+go32_resume (int pid, int step, enum target_signal siggnal);
+static int
+go32_wait (int pid, struct target_waitstatus *status);
+static void
+go32_fetch_registers (int regno);
+static void
+store_register (int regno);
+static void
+go32_store_registers (int regno);
+static void
+go32_prepare_to_store (void);
+static int
+go32_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write,
+		  struct target_ops *target);
+static void
+go32_files_info (struct target_ops *target);
+static void
+go32_stop (void);
+static void
+go32_kill_inferior (void);
+static void
+go32_create_inferior (char *exec_file, char *args, char **env);
+static void
+go32_mourn_inferior (void);
+static int
+go32_can_run (void);
+static void
+ignore (void);
+static void
+ignore2 (char *a, int b);
+static int go32_insert_aligned_watchpoint (int pid, CORE_ADDR waddr,
+					   CORE_ADDR addr, int len, int rw);
+static int go32_insert_nonaligned_watchpoint (int pid, CORE_ADDR waddr,
+					      CORE_ADDR addr, int len, int rw);
+
+static struct target_ops go32_ops;
 
 static void
 print_387_status (unsigned short status, struct env387 *ep)
@@ -245,7 +350,13 @@
   else
     a_tss.tss_eflags &= 0xfeff;
 
+#if __DJGPP_MINOR__ < 3
+  save_npx ();
+#endif
   run_child ();
+#if __DJGPP_MINOR__ < 3
+  load_npx ();
+#endif
 
   if (a_tss.tss_irqn == 0x21)
     {
@@ -522,12 +633,6 @@
 #define SHOW_DR(text) do {} while (0)
 #endif
 
-static int go32_insert_aligned_watchpoint (int pid, CORE_ADDR waddr,
-					   CORE_ADDR addr, int len, int rw);
-
-static int go32_insert_nonaligned_watchpoint (int pid, CORE_ADDR waddr,
-					      CORE_ADDR addr, int len, int rw);
-
 /* Insert a watchpoint.  */
 
 int
@@ -705,8 +810,6 @@
 
   return 0;
 }
-
-static struct target_ops go32_ops;
 
 static void
 init_go32_ops (void)

******************************************************
* email:   Robert Hoehne <robert.hoehne@gmx.net>     *
* Post:    Am Berg 3, D-09573 Dittmannsdorf, Germany *
* WWW:     http://www.tu-chemnitz.de/~sho/rho        *
******************************************************