src/m/macppc.h

   1 /* machine description file For the powerpc Macintosh.
   2    Copyright (C) 1994, 2001, 2002 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 1, or (at your option)
   9 any later version.
  10
  11 GNU Emacs is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Emacs; see the file COPYING.  If not, write to
  18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 /* Define WORDS_BIG_ENDIAN iff lowest-numbered byte in a word
  22    is the most significant byte.  */
  23
  24 #define WORDS_BIG_ENDIAN
  25
  26 /* Define NO_ARG_ARRAY if you cannot take the address of the first of a
  27  * group of arguments and treat it as an array of the arguments.  */
  28
  29 #define NO_ARG_ARRAY
  30
  31 /* Define WORD_MACHINE if addresses and such have
  32  * to be corrected before they can be used as byte counts.  */
  33
  34 /* #define WORD_MACHINE */
  35
  36 /* Now define a symbol for the cpu type, if your compiler
  37    does not define it automatically:
  38    Ones defined so far include vax, m68000, ns16000, pyramid,
  39    orion, tahoe, APOLLO and many others */
  40
  41 /* Use type EMACS_INT rather than a union, to represent Lisp_Object */
  42 /* This is desirable for most machines.  */
  43
  44 #define NO_UNION_TYPE
  45
  46 /* Data type of load average, as read out of kmem.  */
  47
  48 #define LOAD_AVE_TYPE long
  49
  50 /* Convert that into an integer that is 100 for a load average of 1.0  */
  51
  52 #define LOAD_AVE_CVT(x) (int) (((double) (x)) * 100.0 / FSCALE)
  53
  54 /* Some really obscure 4.2-based systems (like Sequent DYNIX)
  55  * do not support asynchronous I/O (using SIGIO) on sockets,
  56  * even though it works fine on tty's.  If you have one of
  57  * these systems, define the following, and then use it in
  58  * config.h (or elsewhere) to decide when (not) to use SIGIO.
  59  *
  60  * You'd think this would go in an operating-system description file,
  61  * but since it only occurs on some, but not all, BSD systems, the
  62  * reasonable place to select for it is in the machine description
  63  * file.
  64  */
  65
  66 /* #define NO_SOCK_SIGIO */
  67
  68 #if defined(__OpenBSD__)
  69 #define ORDINARY_LINK
  70 #endif
  71
  72 #define UNEXEC unexelf.o
  73
  74 #define NO_TERMIO
  75
  76 #if defined (LINUX) || defined (__NetBSD__) || defined (__OpenBSD__)
  77 # define TEXT_END ({ extern int _etext; &_etext; })
  78 #endif
  79
  80 #if (defined (__NetBSD__) || defined (__OpenBSD__)) && defined (__ELF__)
  81 #define HAVE_TEXT_START
  82 #endif
  83
  84 /* NAKAJI Hiroyuki <nakaji@tutrp.tut.ac.jp> says this is needed
  85    For MkLinux/LinuxPPC.  */
  86
  87 #ifdef LINUX
  88 #define LINKER $(CC) -nostdlib
  89 #define LD_SWITCH_MACHINE -Xlinker -m -Xlinker elf32ppc
  90 /* s/gnu-linux.h defines this to `-z nocombreloc' which does not work here
  91    because prefix-args is not used.  */
  92 #undef LD_SWITCH_SYSTEM_TEMACS
  93 #define LD_SWITCH_MACHINE_TEMACS -Xlinker -znocombreloc
  94 #endif
  95
  96 #if 0  /* This breaks things on PPC GNU/Linux ecept for Yellowdog,
  97           even with identical GCC, as, ld.  Let's take it out until we
  98           know what's really going on here.  */
  99 /* GCC 2.95 and newer on GNU/Linux PPC changed the load address to
 100    0x10000000.  */
 101 #if defined __linux__
 102 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95)
 103 #define DATA_SEG_BITS  0x10000000
 104 #endif
 105 #endif
 106 #endif /* 0 */