Initial revision

1 files changed, 209 insertions, 0 deletions

diff --git a/src/m/acorn.h b/src/m/acorn.h
new file mode 100644
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+/* Machine description file for Acorn RISCiX machines.
+   Copyright (C) 1994 Free Software Foundation, Inc.
+
+This file is part of GNU Emacs.
+
+GNU Emacs 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.
+
+GNU Emacs 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 GNU Emacs; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+
+
+/* The following three symbols give information on
+ the size of various data types.  */
+
+#define SHORTBITS 16		/* Number of bits in a short */
+
+#define INTBITS 32		/* Number of bits in an int */
+
+#define LONGBITS 32		/* Number of bits in a long */
+
+/* Define BIG_ENDIAN iff lowest-numbered byte in a word
+   is the most significant byte.  */
+
+#undef BIG_ENDIAN
+
+/* Define NO_ARG_ARRAY if you cannot take the address of the first of a
+ * group of arguments and treat it as an array of the arguments.  We can't
+ * do this on the arm with gcc, since the first 4 args are in registers.  */
+
+#ifdef __GNUC__
+#define NO_ARG_ARRAY
+#else
+#undef NO_ARG_ARRAY
+#endif
+
+/* Define WORD_MACHINE if addresses and such have
+ * to be corrected before they can be used as byte counts.  */
+
+#undef WORD_MACHINE
+
+/* Define how to take a char and sign-extend into an int.
+   On machines where char is signed, this is a no-op.  */
+
+/* ARM note - The RISCiX Norcroft C Compiler has ALL
+   non-32-bit types as unsigned */
+
+#define SIGN_EXTEND_CHAR(c) (((int)(c) << 24) >> 24)
+
+/* Now define a symbol for the cpu type, if your compiler
+   does not define it automatically:
+   Ones defined so far include vax, m68000, ns16000, pyramid,
+   orion, tahoe, APOLLO and many others */
+
+/* ARM note - this is done by the Norcroft compiler - symbol is `__arm' */
+
+/* Use type int rather than a union, to represent Lisp_Object */
+/* This is desirable for most machines.  */
+
+#define NO_UNION_TYPE
+
+/* Define EXPLICIT_SIGN_EXTEND if XINT must explicitly sign-extend
+   the 24-bit bit field into an int.  In other words, if bit fields
+   are always unsigned.
+
+   If you use NO_UNION_TYPE, this flag does not matter.  */
+
+#define EXPLICIT_SIGN_EXTEND
+
+#ifdef LDAV_SYMBOL
+#undef LDAV_SYMBOL
+#endif
+
+#define LDAV_SYMBOL "_iavenrun"
+
+
+/* Data type of load average, as read out of kmem.  */
+
+#define LOAD_AVE_TYPE long
+
+/* Convert that into an integer that is 100 for a load average of 1.0  */
+
+/*
+ * Scale factor for scaled integers used to count
+ * %cpu time and load averages.
+ */
+
+/* FSHIFT and FSCALE are defined in param.h, but are required by
+   LOAD_AVE_CVT, so they need to be defined here.  */
+
+#ifndef FSHIFT
+#define FSHIFT	8	/* bits to right of fixed binary point */
+#endif
+
+#ifndef FSCALE
+#define FSCALE	(1<<FSHIFT)
+#endif
+
+#define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE)
+
+/* Define CANNOT_DUMP on machines where unexec does not work.
+   Then the function dump-emacs will not be defined
+   and temacs will do (load "loadup") automatically unless told otherwise.  */
+
+#undef CANNOT_DUMP
+
+/* Define VIRT_ADDR_VARIES if the virtual addresses of
+   pure and impure space as loaded can vary, and even their
+   relative order cannot be relied on.
+
+   Otherwise Emacs assumes that text space precedes data space,
+   numerically.  */
+
+#undef VIRT_ADDR_VARIES
+
+/* This prevents Emacs dumping an unsqueezed binary with the
+   SQUEEZE bit set in the magic number. */
+
+#define ADJUST_EXEC_HEADER {hdr.a_magic &= ~MF_SQUEEZED;}
+
+/* Define C_ALLOCA if this machine does not support a true alloca
+   and the one written in C should be used instead.
+   Define HAVE_ALLOCA to say that the system provides a properly
+   working alloca function and it should be used.
+   Define neither one if an assembler-language alloca
+   in the file alloca.s should be used.  */
+
+#ifdef __GNUC__
+
+/* Use builtin alloca. Also be sure that no other ones are tried out. */
+#define alloca __builtin_alloca
+#define HAVE_ALLOCA
+
+/* Keep gcc/RISCiX happy - it uses __gccmain where other versions of
+   gcc use __main, because of a library routine name clash. */
+#define __main __gccmain
+
+#else
+#define C_ALLOCA
+#undef HAVE_ALLOCA
+#endif  /* __GNUC__ */
+
+/* Define NO_REMAP if memory segmentation makes it not work well
+   to change the boundary between the text section and data section
+   when Emacs is dumped.  If you define this, the preloaded Lisp
+   code will not be sharable; but that's better than failing completely.  */
+
+#define NO_REMAP
+
+
+#ifndef NOT_C_CODE
+#define TEXT_START	0x8000
+#define DATA_END	&_edata
+extern int _edata;
+#define etext _etext
+#endif
+
+/* Avoid debugging library */
+#define LIBS_DEBUG
+
+/* Avoid sharing libc */
+#define LIB_STANDARD -lc_n
+
+/* Avoid sharing libX11 */
+#define LIB_X11_LIB -lX11_n
+
+/* All kinds of symbol definitions, so as to avoid multiply defined symbol
+   errors from the RISCiX linker. */
+
+#ifdef __GNUC__
+#define C_DEBUG_SWITCH
+
+#define C_OPTIMIZE_SWITCH -O1 -fomit-frame-pointer -w -g -Dgetopt=gnu_getopt -Dopterr=gnu_opterr -Doptind=gnu_optind -Doptarg=gnu_optarg -Dcfree=gnu_cfree -D___type=
+
+#else
+#define C_DEBUG_SWITCH -O -w -g -Dgetopt=gnu_getopt -Dopterr=gnu_opterr -Doptind=gnu_optind -Doptarg=gnu_optarg -Dcfree=gnu_cfree
+#endif
+
+/* Turn this on to avoid the emacs malloc and use standard one */
+
+#undef SYSTEM_MALLOC
+
+/* Use <dirent.h>. */
+#define SYSV_SYSTEM_DIR
+
+/* PURESIZE needs to be slightly bigger on the Arm */
+#define PURESIZE 260000
+
+/* For the portable alloca */
+#define STACK_DIRECTION -1
+
+#ifdef NO_REMAP
+/* CRT0_O is defined in s/riscix1-1.h or s/riscix1-2.h, as appropriate. */
+#define START_FILES pre-crt0.o CRT0_O
+#else
+Cannot
+do
+this
+yet
+#endif