entered into RCS

2 files changed, 136 insertions, 0 deletions

diff --git a/sysdeps/standalone/i386/force_cpu386/_exit.c b/sysdeps/standalone/i386/force_cpu386/_exit.c
new file mode 100644
index 0000000000..011bb8bda9
--- /dev/null
+++ b/sysdeps/standalone/i386/force_cpu386/_exit.c
@@ -0,0 +1,47 @@
+/* Copyright (C) 1991 Free Software Foundation, Inc.
+   Contributed by Joel Sherrill (jsherril@redstone-emh2.army.mil),
+     On-Line Applications Research Corporation.
+ 
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <ansidecl.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+/* This returns control to FORCEbug. */
+
+void DEFUN_VOID(Bsp_cleanup);
+
+/* The function `_exit' should take a status argument and simply
+   terminate program execution, using the low-order 8 bits of the
+   given integer as status.  */
+
+__NORETURN void
+DEFUN(_exit, (status), int status)
+{
+  /* status is ignored */
+  Bsp_cleanup();
+}
+
+#ifdef	 HAVE_GNU_LD
+
+#include <gnu-stabs.h>
+
+stub_warning(_exit);
+
+#endif	/* GNU stabs.  */
diff --git a/sysdeps/standalone/i386/force_cpu386/strtsupp.S b/sysdeps/standalone/i386/force_cpu386/strtsupp.S
new file mode 100644
index 0000000000..6b78a8c343
--- /dev/null
+++ b/sysdeps/standalone/i386/force_cpu386/strtsupp.S
@@ -0,0 +1,89 @@
+/* Copyright (C) 1994 Free Software Foundation, Inc.
+   Contributed by Joel Sherrill (jsherril@redstone-emh2.army.mil),
+     On-Line Applications Research Corporation.
+ 
+This file is part of the GNU C Library.
+ 
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+ 
+The GNU C Library 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
+Library General Public License for more details.
+ 
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+/*  This file assists the board independent startup code by
+ *  loading the proper segment register values.  The values
+ *  loaded are dependent on the FORCEBUG.  
+ *
+ *  NOTE:  No stack has been established when this routine
+ *         is invoked.  It returns by jumping back to the start code.
+ *
+ */
+
+/*
+ *  FORCEBUG loads us into a virtual address space which 
+ *  really starts at PHYSICAL_ADDRESS_BASE.  
+ *  
+ */
+
+.set PHYSICAL_ADDRESS_BASE,    0x00002000
+
+/*
+ *  At reset time, FORCEBUG normally has the segment selectors preloaded.   
+ *  If a human resets the instruction pointer, this will not have occurred.
+ *  However, no guarantee can be made of the other registers if cs:ip was 
+ *  modified to restart the program.  Because of this, the BSP reloads all 
+ *  segment registers (except cs) with the values they have following 
+ *  a reset.  
+ */
+
+
+.set RESET_SS, 0x40        # initial value of stack segment register
+.set RESET_DS, 0x40        # initial value of data segment register
+.set RESET_ES, 0x40        # initial value of extra segment register
+.set RESET_FS, 0x40        # initial value of "f" segment register
+.set RESET_GS, 0x30        # initial value of "g" segment register 
+
+
+#define LOAD_SEGMENTS(_value,_segreg) \
+        movw      $_value##,%ax ;  \
+        movw      %ax,##_segreg
+
+    
+        .global  _load_segments
+
+        .global   _establish_stack
+
+_load_segments:
+
+        LOAD_SEGMENTS( RESET_SS, %ss )
+        LOAD_SEGMENTS( RESET_DS, %ds )
+        LOAD_SEGMENTS( RESET_ES, %es )
+        LOAD_SEGMENTS( RESET_FS, %fs )
+        LOAD_SEGMENTS( RESET_GS, %gs )
+
+        jmp     _establish_stack        # return to the bsp entry code
+
+        .global  _return_to_monitor
+_return_to_monitor:
+
+        movb    $0,%al
+        int     $0x20                   # restart FORCEbug
+        jmp     start                   # FORCEbug does not reset PC
+
+        .data
+
+        .global _Do_Load_IDT
+_Do_Load_IDT:   .byte 1
+
+        .global _Do_Load_GDT
+_Do_Load_GDT:   .byte 0
+