annotate src/alloca.s @ 2367:ecf1ebac70d8

[xemacs-hg @ 2004-11-04 23:05:23 by ben] commit mega-patch configure.in: Turn off -Winline and -Wchar-subscripts. Use the right set of cflags when compiling modules. Rewrite ldap configuration to separate the inclusion of lber (needed in recent Cygwin) from the basic checks for the needed libraries. add a function for MAKE_JUNK_C; initially code was added to generate xemacs.def using this, but it will need to be rewritten. add an rm -f for junk.c to avoid weird Cygwin bug with cp -f onto an existing file. Sort list of auto-detected functions and eliminate unused checks for stpcpy, setlocale and getwd. Add autodetection of Cygwin scanf problems BETA: Rewrite section on configure to indicate what flags are important and what not. digest-doc.c, make-dump-id.c, profile.c, sorted-doc.c: Add proper decls for main(). make-msgfile.c: Document that this is old junk. Move proposal to text.c. make-msgfile.lex: Move proposal to text.c. make-mswin-unicode.pl: Convert error-generating code so that the entire message will be seen as a single unrecognized token. mule/mule-ccl.el: Update docs. lispref/mule.texi: Update CCL docs. ldap/eldap.c: Mule-ize. Use EXTERNAL_LIST_LOOP_2 instead of deleted EXTERNAL_LIST_LOOP. * XEmacs 21.5.18 "chestnut" is released. --------------------------------------------------------------- MULE-RELATED WORK: --------------------------------------------------------------- --------------------------- byte-char conversion --------------------------- buffer.c, buffer.h, insdel.c, text.c: Port FSF algorithm for byte-char conversion, replacing broken previous version. Track the char position of the gap. Add functions to do char-byte conversion downwards as well as upwards. Move comments about algorithm workings to internals manual. --------------------------- work on types --------------------------- alloc.c, console-x-impl.h, dump-data.c, dump-data.h, dumper.c, dialog-msw.c, dired-msw.c, doc.c, editfns.c, esd.c, event-gtk.h, event-msw.c, events.c, file-coding.c, file-coding.h, fns.c, glyphs-eimage.c, glyphs-gtk.c, glyphs-msw.c, glyphs-shared.c, glyphs-x.c, glyphs.c, glyphs.h, gui.c, hpplay.c, imgproc.c, intl-win32.c, lrecord.h, lstream.c, keymap.c, lisp.h, libsst.c, linuxplay.c, miscplay.c, miscplay.h, mule-coding.c, nas.c, nt.c, ntheap.c, ntplay.c, objects-msw.c, objects-tty.c, objects-x.c, print.c, process-nt.c, process.c, redisplay.h, select-common.h, select-gtk.c, select-x.c, sgiplay.c, sound.c, sound.h, sunplay.c, sysfile.h, sysdep.c, syswindows.h, text.c, unexnt.c, win32.c, xgccache.c: Further work on types. This creates a full set of types for all the basic semantics of `char' that I have so far identified, so that its semantics can always be identified for the purposes of proper Mule-safe code, and the raw use of `char' always avoided. (1) More type renaming, for consistency of naming. Char_ASCII -> Ascbyte UChar_ASCII -> UAscbyte Char_Binary -> CBinbyte UChar_Binary -> Binbyte SChar_Binary -> SBinbyte (2) Introduce Rawbyte, CRawbyte, Boolbyte, Chbyte, UChbyte, and Bitbyte and use them. (3) New types Itext, Wexttext and Textcount for separating out the concepts of bytes and textual units (different under UTF-16 and UTF-32, which are potential internal encodings). (4) qxestr*_c -> qxestr*_ascii. lisp.h: New; goes with other qxe() functions. #### Maybe goes in a different section. lisp.h: Group generic int-type defs together with EMACS_INT defs. lisp.h: * lisp.h (WEXTTEXT_IS_WIDE) New defns. lisp.h: New type to replace places where int occurs as a boolean. It's signed because occasionally people may want to use -1 as an error value, and because unsigned ints are viral -- see comments in the internals manual against using them. dynarr.c: int -> Bytecount. --------------------------- Mule-izing --------------------------- device-x.c: Partially Mule-ize. dumper.c, dumper.h: Mule-ize. Use Rawbyte. Use stderr_out not printf. Use wext_*(). sysdep.c, syswindows.h, text.c: New Wexttext API for manipulation of external text that may be Unicode (e.g. startup code under Windows). emacs.c: Mule-ize. Properly deal with argv in external encoding. Use wext_*() and Wexttext. Use Rawbyte. #if 0 some old junk on SCO that is unlikely to be correct. Rewrite allocation code in run-temacs. emacs.c, symsinit.h, win32.c: Rename win32 init function and call it even earlier, to initialize mswindows_9x_p even earlier, for use in startup code (XEUNICODE_P). process.c: Use _wenviron not environ under Windows, to get Unicode environment variables. event-Xt.c: Mule-ize drag-n-drop related stuff. dragdrop.c, dragdrop.h, frame-x.c: Mule-ize. text.h: Add some more stand-in defines for particular kinds of conversion; use in Mule-ization work in frame-x.c etc. --------------------------- Freshening --------------------------- intl-auto-encap-win32.c, intl-auto-encap-win32.h: Regenerate. --------------------------- Unicode-work --------------------------- intl-win32.c, syswindows.h: Factor out common options to MultiByteToWideChar and WideCharToMultiByte. Add convert_unicode_to_multibyte_malloc() and convert_unicode_to_multibyte_dynarr() and use. Add stuff for alloca() conversion of multibyte/unicode. alloc.c: Use dfc_external_data_len() in case of unicode coding system. alloc.c, mule-charset.c: Don't zero out and reinit charset Unicode tables. This fucks up dump-time loading. Anyway, either we load them at dump time or run time, never both. unicode.c: Dump the blank tables as well. --------------------------------------------------------------- DOCUMENTATION, MOSTLY MULE-RELATED: --------------------------------------------------------------- EmacsFrame.c, emodules.c, event-Xt.c, fileio.c, input-method-xlib.c, mule-wnnfns.c, redisplay-gtk.c, redisplay-tty.c, redisplay-x.c, regex.c, sysdep.c: Add comment about Mule work needed. text.h: Add more documentation describing why DFC routines were not written to return their value. Add some other DFC documentation. console-msw.c, console-msw.h: Add pointer to docs in win32.c. emacs.c: Add comments on sources of doc info. text.c, charset.h, unicode.c, intl-win32.c, intl-encap-win32.c, text.h, file-coding.c, mule-coding.c: Collect background comments and related to text matters and internationalization, and proposals for work to be done, in text.c or Internals manual, stuff related to specific textual API's in text.h, and stuff related to internal implementation of Unicode conversion in unicode.c. Put lots of pointers to the comments to make them easier to find. s/mingw32.h, s/win32-common.h, s/win32-native.h, s/windowsnt.h, win32.c: Add bunches of new documentation on the different kinds of builds and environments under Windows and how they work. Collect this info in win32.c. Add pointers to these docs in the relevant s/* files. emacs.c: Document places with long comments. Remove comment about exiting, move to internals manual, put in pointer. event-stream.c: Move docs about event queues and focus to internals manual, put in pointer. events.h: Move docs about event stream callbacks to internals manual, put in pointer. profile.c, redisplay.c, signal.c: Move documentation to the Internals manual. process-nt.c: Add pointer to comment in win32-native.el. lisp.h: Add comments about some comment conventions. lisp.h: Add comment about the second argument. device-msw.c, redisplay-msw.c: @@#### comments are out-of-date. --------------------------------------------------------------- PDUMP WORK (MOTIVATED BY UNICODE CHANGES) --------------------------------------------------------------- alloc.c, buffer.c, bytecode.c, console-impl.h, console.c, device.c, dumper.c, lrecord.h, elhash.c, emodules.h, events.c, extents.c, frame.c, glyphs.c, glyphs.h, mule-charset.c, mule-coding.c, objects.c, profile.c, rangetab.c, redisplay.c, specifier.c, specifier.h, window.c, lstream.c, file-coding.h, file-coding.c: PDUMP: Properly implement dump_add_root_block(), which never worked before, and is necessary for dumping Unicode tables. Pdump name changes for accuracy: XD_STRUCT_PTR -> XD_BLOCK_PTR. XD_STRUCT_ARRAY -> XD_BLOCK_ARRAY. XD_C_STRING -> XD_ASCII_STRING. *_structure_* -> *_block_*. lrecord.h: some comments added about dump_add_root_block() vs dump_add_root_block_ptr(). extents.c: remove incorrect comment about pdump problems with gap array. --------------------------------------------------------------- ALLOCATION --------------------------------------------------------------- abbrev.c, alloc.c, bytecode.c, casefiddle.c, device-msw.c, device-x.c, dired-msw.c, doc.c, doprnt.c, dragdrop.c, editfns.c, emodules.c, file-coding.c, fileio.c, filelock.c, fns.c, glyphs-eimage.c, glyphs-gtk.c, glyphs-msw.c, glyphs-x.c, gui-msw.c, gui-x.c, imgproc.c, intl-win32.c, lread.c, menubar-gtk.c, menubar.c, nt.c, objects-msw.c, objects-x.c, print.c, process-nt.c, process-unix.c, process.c, realpath.c, redisplay.c, search.c, select-common.c, symbols.c, sysdep.c, syswindows.h, text.c, text.h, ui-byhand.c: New macros {alloca,xnew}_{itext,{i,ext,raw,bin,asc}bytes} for more convenient allocation of these commonly requested items. Modify functions to use alloca_ibytes, alloca_array, alloca_extbytes, xnew_ibytes, etc. also XREALLOC_ARRAY, xnew. alloc.c: Rewrite the allocation functions to factor out repeated code. Add assertions for freeing dumped data. lisp.h: Moved down and consolidated with other allocation stuff. lisp.h, dynarr.c: New functions for allocation that's very efficient when mostly in LIFO order. lisp.h, text.c, text.h: Factor out some stuff for general use by alloca()-conversion funs. text.h, lisp.h: Fill out convenience routines for allocating various kinds of bytes and put them in lisp.h. Use them in place of xmalloc(), ALLOCA(). text.h: Fill out the convenience functions so the _MALLOC() kinds match the alloca() kinds. --------------------------------------------------------------- ERROR-CHECKING --------------------------------------------------------------- text.h: Create ASSERT_ASCTEXT_ASCII() and ASSERT_ASCTEXT_ASCII_LEN() from similar Eistring checkers and change the Eistring checkers to use them instead. --------------------------------------------------------------- MACROS IN LISP.H --------------------------------------------------------------- lisp.h: Redo GCPRO declarations. Create a "base" set of functions that can be used to generate any kind of gcpro sets -- regular, ngcpro, nngcpro, private ones used in GC_EXTERNAL_LIST_LOOP_2. buffer.c, callint.c, chartab.c, console-msw.c, device-x.c, dialog-msw.c, dired.c, extents.c, ui-gtk.c, rangetab.c, nt.c, mule-coding.c, minibuf.c, menubar-msw.c, menubar.c, menubar-gtk.c, lread.c, lisp.h, gutter.c, glyphs.c, glyphs-widget.c, fns.c, fileio.c, file-coding.c, specifier.c: Eliminate EXTERNAL_LIST_LOOP, which does not check for circularities. Use EXTERNAL_LIST_LOOP_2 instead or EXTERNAL_LIST_LOOP_3 or EXTERNAL_PROPERTY_LIST_LOOP_3 or GC_EXTERNAL_LIST_LOOP_2 (new macro). Removed/redid comments on EXTERNAL_LIST_LOOP. --------------------------------------------------------------- SPACING FIXES --------------------------------------------------------------- callint.c, hftctl.c, number-gmp.c, process-unix.c: Spacing fixes. --------------------------------------------------------------- FIX FOR GEOMETRY PROBLEM IN FIRST FRAME --------------------------------------------------------------- unicode.c: Add workaround for newlib bug in sscanf() [should be fixed by release 1.5.12 of Cygwin]. toolbar.c: bug fix for problem of initial frame being 77 chars wide on Windows. will be overridden by my other ws. --------------------------------------------------------------- FIX FOR LEAKING PROCESS HANDLES: --------------------------------------------------------------- process-nt.c: Fixes for leaking handles. Inspired by work done by Adrian Aichner <adrian@xemacs.org>. --------------------------------------------------------------- FIX FOR CYGWIN BUG (Unicode-related): --------------------------------------------------------------- unicode.c: Add workaround for newlib bug in sscanf() [should be fixed by release 1.5.12 of Cygwin]. --------------------------------------------------------------- WARNING FIXES: --------------------------------------------------------------- console-stream.c: `reinit' is unused. compiler.h, event-msw.c, frame-msw.c, intl-encap-win32.c, text.h: Add stuff to deal with ANSI-aliasing warnings I got. regex.c: Gather includes together to avoid warning. --------------------------------------------------------------- CHANGES TO INITIALIZATION ROUTINES: --------------------------------------------------------------- buffer.c, emacs.c, console.c, debug.c, device-x.c, device.c, dragdrop.c, emodules.c, eval.c, event-Xt.c, event-gtk.c, event-msw.c, event-stream.c, event-tty.c, events.c, extents.c, faces.c, file-coding.c, fileio.c, font-lock.c, frame-msw.c, glyphs-widget.c, glyphs.c, gui-x.c, insdel.c, lread.c, lstream.c, menubar-gtk.c, menubar-x.c, minibuf.c, mule-wnnfns.c, objects-msw.c, objects.c, print.c, scrollbar-x.c, search.c, select-x.c, text.c, undo.c, unicode.c, window.c, symsinit.h: Call reinit_*() functions directly from emacs.c, for clarity. Factor out some redundant init code. Move disallowed stuff that had crept into vars_of_glyphs() into complex_vars_of_glyphs(). Call init_eval_semi_early() from eval.c not in the middle of vars_of_() in emacs.c since there should be no order dependency in the latter calls. --------------------------------------------------------------- ARMAGEDDON: --------------------------------------------------------------- alloc.c, emacs.c, lisp.h, print.c: Rename inhibit_non_essential_printing_operations to inhibit_non_essential_conversion_operations. text.c: Assert on !inhibit_non_essential_conversion_operations. console-msw.c, print.c: Don't do conversion in SetConsoleTitle or FindWindow to avoid problems during armageddon. Put #errors for NON_ASCII_INTERNAL_FORMAT in places where problems would arise. --------------------------------------------------------------- CHANGES TO THE BUILD PROCEDURE: --------------------------------------------------------------- config.h.in, s/cxux.h, s/usg5-4-2.h, m/powerpc.h: Add comment about correct ordering of this file. Rearrange everything to follow this -- put all #undefs together and before the s&m files. Add undefs for HAVE_ALLOCA, C_ALLOCA, BROKEN_ALLOCA_IN_FUNCTION_CALLS, STACK_DIRECTION. Remove unused HAVE_STPCPY, HAVE_GETWD, HAVE_SETLOCALE. m/gec63.h: Deleted; totally broken, not used at all, not in FSF. m/7300.h, m/acorn.h, m/alliant-2800.h, m/alliant.h, m/altos.h, m/amdahl.h, m/apollo.h, m/att3b.h, m/aviion.h, m/celerity.h, m/clipper.h, m/cnvrgnt.h, m/convex.h, m/cydra5.h, m/delta.h, m/delta88k.h, m/dpx2.h, m/elxsi.h, m/ews4800r.h, m/gould.h, m/hp300bsd.h, m/hp800.h, m/hp9000s300.h, m/i860.h, m/ibmps2-aix.h, m/ibmrs6000.h, m/ibmrt-aix.h, m/ibmrt.h, m/intel386.h, m/iris4d.h, m/iris5d.h, m/iris6d.h, m/irist.h, m/isi-ov.h, m/luna88k.h, m/m68k.h, m/masscomp.h, m/mg1.h, m/mips-nec.h, m/mips-siemens.h, m/mips.h, m/news.h, m/nh3000.h, m/nh4000.h, m/ns32000.h, m/orion105.h, m/pfa50.h, m/plexus.h, m/pmax.h, m/powerpc.h, m/pyrmips.h, m/sequent-ptx.h, m/sequent.h, m/sgi-challenge.h, m/symmetry.h, m/tad68k.h, m/tahoe.h, m/targon31.h, m/tekxd88.h, m/template.h, m/tower32.h, m/tower32v3.h, m/ustation.h, m/vax.h, m/wicat.h, m/xps100.h: Delete C_ALLOCA, HAVE_ALLOCA, STACK_DIRECTION, BROKEN_ALLOCA_IN_FUNCTION_CALLS. All of this is auto-detected. When in doubt, I followed recent FSF sources, which also have these things deleted.
author ben
date Thu, 04 Nov 2004 23:08:28 +0000
parents 3ecd8885ac67
children aa5ed11f473b
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1 /* `alloca' standard 4.2 subroutine for 68000's and 16000's and others.
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2 Also has _setjmp and _longjmp for pyramids.
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3 Copyright (C) 1985, 1986, 1988 Free Software Foundation, Inc.
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4
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5 This file is part of XEmacs.
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6
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7 XEmacs is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 2, or (at your option) any
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10 later version.
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11
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12 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with XEmacs; see the file COPYING. If not, write to
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19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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20 Boston, MA 02111-1307, USA. */
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21
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22 /* Synched up with: FSF 19.30. */
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23
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24 /* Both 68000 systems I have run this on have had broken versions of alloca.
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25 Also, I am told that non-berkeley systems do not have it at all.
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26 So replace whatever system-provided alloca there may be
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27 on all 68000 systems. */
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28
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29 #define NOT_C_CODE
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30 #ifdef emacs
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31 #include <config.h>
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32 #else
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33 #include "config.h"
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34 #endif
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35
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36 #ifndef HAVE_ALLOCA /* define this to use system's alloca */
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37
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38 #ifndef hp9000s300
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39 #ifndef m68k
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40 #ifndef m68000
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41 #ifndef WICAT
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42 #ifndef ns32000
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43 #ifndef ns16000
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44 #ifndef sequent
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45 #ifndef pyramid
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46 #ifndef ATT3B5
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47 #ifndef XENIX
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48 you
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49 lose!!
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50 #endif /* XENIX */
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51 #endif /* ATT3B5 */
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52 #endif /* pyramid */
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53 #endif /* sequent */
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54 #endif /* ns16000 */
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55 #endif /* ns32000 */
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56 #endif /* WICAT */
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57 #endif /* m68000 */
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58 #endif /* m68k */
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59 #endif /* hp9000s300 */
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60
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61
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62 #ifdef hp9000s300
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63 #ifdef OLD_HP_ASSEMBLER
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64 data
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65 text
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66 globl _alloca
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67 _alloca
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68 move.l (sp)+,a0 ; pop return addr from top of stack
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69 move.l (sp)+,d0 ; pop size in bytes from top of stack
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70 add.l #ROUND,d0 ; round size up to long word
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71 and.l #MASK,d0 ; mask out lower two bits of size
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72 sub.l d0,sp ; allocate by moving stack pointer
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73 tst.b PROBE(sp) ; stack probe to allocate pages
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74 move.l sp,d0 ; return pointer
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75 add.l #-4,sp ; new top of stack
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76 jmp (a0) ; not a normal return
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77 MASK equ -4 ; Longword alignment
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78 ROUND equ 3 ; ditto
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79 PROBE equ -128 ; safety buffer for C compiler scratch
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80 data
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81 #else /* new hp assembler syntax */
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82 /*
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83 The new compiler does "move.m <registers> (%sp)" to save registers,
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84 so we must copy the saved registers when we mung the sp.
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85 The old compiler did "move.m <register> <offset>(%a6)", which
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86 gave us no trouble
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87 */
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88 text
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89 set PROBE,-128 # safety for C frame temporaries
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90 set MAXREG,22 # d2-d7, a2-a5, fp2-fp7 may have been saved
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91 global _alloca
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92 _alloca:
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93 mov.l (%sp)+,%a0 # return address
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94 mov.l (%sp)+,%d0 # number of bytes to allocate
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95 mov.l %sp,%a1 # save old sp for register copy
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96 mov.l %sp,%d1 # compute new sp
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97 sub.l %d0,%d1 # space requested
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98 and.l &-4,%d1 # round down to longword
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99 sub.l &MAXREG*4,%d1 # space for saving registers
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100 mov.l %d1,%sp # save new value of sp
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101 tst.b PROBE(%sp) # create pages (sigh)
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102 mov.l %a2,%d1 # save reg a2
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103 mov.l %sp,%a2
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104 move.w &MAXREG-1,%d0
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105 copy_regs_loop: /* save caller's saved registers */
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106 mov.l (%a1)+,(%a2)+
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107 dbra %d0,copy_regs_loop
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108 mov.l %a2,%d0 # return value
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109 mov.l %d1,%a2 # restore a2
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110 add.l &-4,%sp # adjust tos
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111 jmp (%a0) # rts
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112 #endif /* new hp assembler */
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113 #else
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114 #ifdef m68k /* SGS assembler totally different */
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115 file "alloca.s"
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116 global alloca
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117 alloca:
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118 #ifdef MOTOROLA_DELTA
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119 /* slightly modified version of alloca to motorola sysV/68 pcc - based
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120 compiler.
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121 this compiler saves used registers relative to %sp instead of %fp.
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122 alright, just make new copy of saved register set whenever we allocate
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123 new space from stack..
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124 this is true at last until SVR3V7 . bug has reported to Motorola. */
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125 set MAXREG,10 # max no of registers to save (d2-d7, a2-a5)
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126 mov.l (%sp)+,%a1 # pop return addr from top of stack
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127 mov.l (%sp)+,%d0 # pop size in bytes from top of stack
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128 mov.l %sp,%a0 # save stack pointer for register copy
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129 addq.l &3,%d0 # round size up to long word
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130 andi.l &-4,%d0 # mask out lower two bits of size
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131 mov.l %sp,%d1 # compute new value of sp to d1
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132 sub.l %d0,%d1 # pseudo-allocate by moving stack pointer
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133 sub.l &MAXREG*4,%d1 # allocate more space for saved regs.
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134 mov.l %d1,%sp # actual allocation.
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135 move.w &MAXREG-1,%d0 # d0 counts saved regs.
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136 mov.l %a2,%d1 # preserve a2.
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137 mov.l %sp,%a2 # make pointer to new reg save area.
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138 copy_regs_loop: # copy stuff from old save area.
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139 mov.l (%a0)+,(%a2)+ # save saved register
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140 dbra %d0,copy_regs_loop
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141 mov.l %a2,%a0 # now a2 is start of allocated space.
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142 mov.l %a2,%d0 # return it in both a0 and d0 to play safe.
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143 mov.l %d1,%a2 # restore a2.
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144 subq.l &4,%sp # new top of stack
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145 jmp (%a1) # far below normal return
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146 #else /* not MOTOROLA_DELTA */
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147 mov.l (%sp)+,%a1 # pop return addr from top of stack
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148 mov.l (%sp)+,%d0 # pop size in bytes from top of stack
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149 add.l &R%1,%d0 # round size up to long word
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150 and.l &-4,%d0 # mask out lower two bits of size
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151 sub.l %d0,%sp # allocate by moving stack pointer
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152 tst.b P%1(%sp) # stack probe to allocate pages
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153 mov.l %sp,%a0 # return pointer as pointer
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154 mov.l %sp,%d0 # return pointer as int to avoid disaster
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155 add.l &-4,%sp # new top of stack
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156 jmp (%a1) # not a normal return
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157 set S%1,64 # safety factor for C compiler scratch
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158 set R%1,3+S%1 # add to size for rounding
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159 set P%1,-132 # probe this far below current top of stack
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160 #endif /* not MOTOROLA_DELTA */
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161
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162 #else /* not m68k */
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163
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164 #ifdef m68000
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165
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166 #ifdef WICAT
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167 /*
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168 * Registers are saved after the corresponding link so we have to explicitly
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169 * move them to the top of the stack where they are expected to be.
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170 * Since we do not know how many registers were saved in the calling function
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171 * we must assume the maximum possible (d2-d7,a2-a5). Hence, we end up
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172 * wasting some space on the stack.
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173 *
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174 * The large probe (tst.b) attempts to make up for the fact that we have
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175 * potentially used up the space that the caller probed for its own needs.
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176 */
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177 .procss m0
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178 .config "68000 1"
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179 .module _alloca
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180 MAXREG: .const 10
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181 .sect text
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182 .global _alloca
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183 _alloca:
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184 move.l (sp)+,a1 ; pop return address
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185 move.l (sp)+,d0 ; pop allocation size
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186 move.l sp,d1 ; get current SP value
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187 sub.l d0,d1 ; adjust to reflect required size...
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188 sub.l #MAXREG*4,d1 ; ...and space needed for registers
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189 and.l #-4,d1 ; backup to longword boundary
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190 move.l sp,a0 ; save old SP value for register copy
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191 move.l d1,sp ; set the new SP value
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192 tst.b -4096(sp) ; grab an extra page (to cover caller)
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193 move.l a2,d1 ; save callers register
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194 move.l sp,a2
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195 move.w #MAXREG-1,d0 ; # of longwords to copy
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196 loop: move.l (a0)+,(a2)+ ; copy registers...
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197 dbra d0,loop ; ...til there are no more
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198 move.l a2,d0 ; end of register area is addr for new space
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199 move.l d1,a2 ; restore saved a2.
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200 addq.l #4,sp ; caller will increment sp by 4 after return.
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201 move.l d0,a0 ; return value in both a0 and d0.
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202 jmp (a1)
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203 .end _alloca
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204 #else
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205
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206 /* Some systems want the _, some do not. Win with both kinds. */
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207 .globl _alloca
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208 _alloca:
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209 .globl alloca
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210 alloca:
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211 movl sp@+,a0
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212 movl a7,d0
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213 subl sp@,d0
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214 andl #~3,d0
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215 movl d0,sp
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216 tstb sp@(0) /* Make stack pages exist */
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217 /* Needed on certain systems
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218 that lack true demand paging */
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219 addql #4,d0
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220 jmp a0@
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221
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222 #endif /* not WICAT */
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223 #endif /* m68000 */
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224 #endif /* not m68k */
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225 #endif /* not hp9000s300 */
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226
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227 #if defined (ns16000) || defined (ns32000)
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228
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229 .text
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230 .align 2
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231 /* Some systems want the _, some do not. Win with both kinds. */
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232 .globl _alloca
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233 _alloca:
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234 .globl alloca
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235 alloca:
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236
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237 /* Two different assembler syntaxes are used for the same code
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238 on different systems. */
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239
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240 #ifdef sequent
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241 #define IM
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242 #define REGISTER(x) x
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243 #else
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244 #ifdef NS5 /* ns SysV assembler */
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245 #define IM $
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246 #define REGISTER(x) x
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247 #else
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248 #define IM $
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249 #define REGISTER(x) 0(x)
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250 #endif
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251 #endif
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252
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253 /*
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254 * The ns16000 is a little more difficult, need to copy regs.
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255 * Also the code assumes direct linkage call sequence (no mod table crap).
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256 * We have to copy registers, and therefore waste 32 bytes.
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257 *
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258 * Stack layout:
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259 * new sp -> junk
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260 * registers (copy)
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261 * r0 -> new data
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262 * | (orig retval)
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263 * | (orig arg)
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264 * old sp -> regs (orig)
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265 * local data
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266 * fp -> old fp
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267 */
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268
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269 movd tos,r1 /* pop return addr */
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270 negd tos,r0 /* pop amount to allocate */
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271 sprd sp,r2
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272 addd r2,r0
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273 bicb IM/**/3,r0 /* 4-byte align */
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274 lprd sp,r0
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275 adjspb IM/**/36 /* space for regs, +4 for caller to pop */
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276 movmd 0(r2),4(sp),IM/**/4 /* copy regs */
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277 movmd 0x10(r2),0x14(sp),IM/**/4
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278 jump REGISTER(r1) /* funky return */
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279 #endif /* ns16000 or ns32000 */
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280
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281 #ifdef pyramid
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282
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283 .globl _alloca
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284
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285 _alloca: addw $3,pr0 # add 3 (dec) to first argument
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286 bicw $3,pr0 # then clear its last 2 bits
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287 subw pr0,sp # subtract from SP the val in PR0
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288 andw $-32,sp # keep sp aligned on multiple of 32.
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289 movw sp,pr0 # ret. current SP
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290 ret
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291
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292 #ifdef PYRAMID_OLD /* This isn't needed in system version 4. */
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293 .globl __longjmp
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294 .globl _longjmp
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295 .globl __setjmp
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296 .globl _setjmp
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297
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298 __longjmp: jump _longjmp
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299 __setjmp: jump _setjmp
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300 #endif
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301
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302 #endif /* pyramid */
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303
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304 #ifdef ATT3B5
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305
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306 .align 4
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307 .globl alloca
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308
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309 alloca:
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310 movw %ap, %r8
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311 subw2 $9*4, %r8
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312 movw 0(%r8), %r1 /* pc */
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313 movw 4(%r8), %fp
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314 movw 8(%r8), %sp
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315 addw2 %r0, %sp /* make room */
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316 movw %sp, %r0 /* return value */
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317 jmp (%r1) /* continue... */
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318
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319 #endif /* ATT3B5 */
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320
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321 #ifdef XENIX
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322
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323 .386
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324
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325 _TEXT segment dword use32 public 'CODE'
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326 assume cs:_TEXT
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327
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328 ;-------------------------------------------------------------------------
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329
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330 public _alloca
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331 _alloca proc near
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332
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333 pop ecx ; return address
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334 pop eax ; amount to alloc
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335 add eax,3 ; round it to 32-bit boundary
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336 and al,11111100B ;
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337 mov edx,esp ; current sp in edx
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338 sub edx,eax ; lower the stack
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339 xchg esp,edx ; start of allocation in esp, old sp in edx
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340 mov eax,esp ; return ptr to base in eax
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341 push [edx+8] ; save poss. stored reg. values (esi,edi,ebx)
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342 push [edx+4] ; on lowered stack
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343 push [edx] ;
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344 sub esp,4 ; allow for 'add esp, 4'
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345 jmp ecx ; jump to return address
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346
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347 _alloca endp
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348
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349 _TEXT ends
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350
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351 end
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352
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353 #endif /* XENIX */
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354
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355 #endif /* not HAVE_ALLOCA */