view src/alloca.s @ 5096:e0587c615e8b

Updates to internals.texi -------------------- ChangeLog entries follow: -------------------- man/ChangeLog addition: 2010-03-04 Ben Wing <ben@xemacs.org> * internals/internals.texi (Top): * internals/internals.texi (list-to-texinfo): Removed. * internals/internals.texi (convert-list-to-texinfo): New. * internals/internals.texi (table-to-texinfo): Removed. * internals/internals.texi (convert-table-to-texinfo): New. Update Lisp functions at top to newest versions. * internals/internals.texi (A History of Emacs): * internals/internals.texi (Through Version 18): * internals/internals.texi (Lucid Emacs): * internals/internals.texi (XEmacs): * internals/internals.texi (The XEmacs Split): * internals/internals.texi (Modules for Other Aspects of the Lisp Interpreter and Object System): * internals/internals.texi (Introduction to Writing C Code): * internals/internals.texi (Writing Good Comments): * internals/internals.texi (Writing Macros): * internals/internals.texi (Major Textual Changes): * internals/internals.texi (Great Integral Type Renaming): * internals/internals.texi (How to Regression-Test): * internals/internals.texi (Creating a Branch): * internals/internals.texi (Dynamic Arrays): * internals/internals.texi (Allocation by Blocks): * internals/internals.texi (mark_object): * internals/internals.texi (gc_sweep): * internals/internals.texi (Byte-Char Position Conversion): * internals/internals.texi (Searching and Matching): * internals/internals.texi (Introduction to Multilingual Issues #3): * internals/internals.texi (Byte Types): * internals/internals.texi (Different Ways of Seeing Internal Text): * internals/internals.texi (Buffer Positions): * internals/internals.texi (Basic internal-format APIs): * internals/internals.texi (The DFC API): * internals/internals.texi (General Guidelines for Writing Mule-Aware Code): * internals/internals.texi (Mule-izing Code): * internals/internals.texi (Locales): * internals/internals.texi (More about code pages): * internals/internals.texi (More about locales): * internals/internals.texi (Unicode support under Windows): * internals/internals.texi (The Frame): * internals/internals.texi (The Non-Client Area): * internals/internals.texi (The Client Area): * internals/internals.texi (The Paned Area): * internals/internals.texi (Text Areas): * internals/internals.texi (The Displayable Area): * internals/internals.texi (Event Queues): * internals/internals.texi (Event Stream Callback Routines): * internals/internals.texi (Focus Handling): * internals/internals.texi (Future Work -- Autodetection): Replace " with ``, '' (not complete, maybe about halfway through).
author Ben Wing <ben@xemacs.org>
date Thu, 04 Mar 2010 07:19:03 -0600
parents aa5ed11f473b
children 308d34e9f07d
line wrap: on
line source

/* `alloca' standard 4.2 subroutine for 68000's and 16000's and others.
   Copyright (C) 1985, 1986, 1988 Free Software Foundation, Inc.

This file is part of XEmacs.

XEmacs 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, or (at your option) any
later version.

XEmacs 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 XEmacs; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

/* Synched up with: FSF 19.30. */

/* Both 68000 systems I have run this on have had broken versions of alloca.
   Also, I am told that non-berkeley systems do not have it at all.
   So replace whatever system-provided alloca there may be
   on all 68000 systems.  */

#define NOT_C_CODE
#ifdef emacs
#include <config.h>
#else
#include "config.h"
#endif

#ifndef HAVE_ALLOCA  /* define this to use system's alloca */

#ifndef m68k
#ifndef m68000
you
lose!!
#endif /* m68000 */
#endif /* m68k */


#ifdef m68k			/* SGS assembler totally different */
	file	"alloca.s"
	global	alloca
alloca:
	mov.l	(%sp)+,%a1	# pop return addr from top of stack
	mov.l	(%sp)+,%d0	# pop size in bytes from top of stack
	add.l	&R%1,%d0	# round size up to long word
	and.l	&-4,%d0		# mask out lower two bits of size
	sub.l	%d0,%sp		# allocate by moving stack pointer
	tst.b	P%1(%sp)	# stack probe to allocate pages
	mov.l	%sp,%a0		# return pointer as pointer
	mov.l	%sp,%d0		# return pointer as int to avoid disaster
	add.l	&-4,%sp		# new top of stack
	jmp	(%a1)		# not a normal return
	set	S%1,64		# safety factor for C compiler scratch
	set	R%1,3+S%1	# add to size for rounding
	set	P%1,-132	# probe this far below current top of stack

#else /* not m68k */

#ifdef m68000

/* Some systems want the _, some do not.  Win with both kinds.  */
.globl	_alloca
_alloca:
.globl	alloca
alloca:
	movl	sp@+,a0
	movl	a7,d0
	subl	sp@,d0
	andl	#~3,d0
	movl	d0,sp
	tstb	sp@(0)		/* Make stack pages exist  */
				/* Needed on certain systems
				   that lack true demand paging */
	addql	#4,d0
	jmp	a0@

#endif /* m68000 */
#endif /* not m68k */

#endif /* not HAVE_ALLOCA */