1 /* NetBSD/arm (RiscBSD) version.
2 Copyright (C) 1993, 1994, 1997, 1998 Free Software Foundation, Inc.
3 Contributed by Mark Brinicombe (amb@physig.ph.kcl.ac.uk)
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
21 /* Run-time Target Specification. */
22 #define TARGET_VERSION fputs (" (ARM/NetBSD)", stderr);
24 /* This is used in ASM_FILE_START. */
25 #define ARM_OS_NAME "NetBSD"
27 /* Unsigned chars produces much better code than signed. */
28 #define DEFAULT_SIGNED_CHAR 0
30 /* Since we always use GAS as our assembler we support stabs. */
31 #define DBX_DEBUGGING_INFO 1
33 /*#undef ASM_DECLARE_FUNCTION_NAME*/
35 /* ARM6 family default cpu. */
36 #define SUBTARGET_CPU_DEFAULT TARGET_CPU_arm6
38 /* Default is to use APCS-32 mode. */
39 #define TARGET_DEFAULT (ARM_FLAG_APCS_32 | ARM_FLAG_SOFT_FLOAT)
43 /* This gets redefined in config/netbsd.h. */
44 #undef TARGET_MEM_FUNCTIONS
48 /* Until they use ELF or something that handles dwarf2 unwinds
49 and initialization stuff better. */
50 #undef DWARF2_UNWIND_INFO
52 /* Some defines for CPP.
53 arm32 is the NetBSD port name, so we always define arm32 and __arm32__. */
55 #define CPP_PREDEFINES "\
56 -Dunix -Driscbsd -Darm32 -D__arm32__ -D__arm__ -D__NetBSD__ \
57 -Asystem(unix) -Asystem(NetBSD) -Acpu(arm) -Amachine(arm)"
59 /* Define _POSIX_SOURCE if necessary. */
62 %(cpp_cpu_arch) %(cpp_apcs_pc) %(cpp_float) %(cpp_endian) \
63 %{posix:-D_POSIX_SOURCE} \
66 /* Because TARGET_DEFAULT sets ARM_FLAG_APCS_32 */
67 #undef CPP_APCS_PC_DEFAULT_SPEC
68 #define CPP_APCS_PC_DEFAULT_SPEC "-D__APCS_32__"
70 /* Because TARGET_DEFAULT sets ARM_FLAG_SOFT_FLOAT */
71 #undef CPP_FLOAT_DEFAULT_SPEC
72 #define CPP_FLOAT_DEFAULT_SPEC "-D__SOFTFP__"
74 /* Pass -X to the linker so that it will strip symbols starting with 'L' */
77 -X %{!nostdlib:%{!r*:%{!e*:-e start}}} -dc -dp %{R*} \
78 %{static:-Bstatic} %{assert*} \
82 #define SIZE_TYPE "unsigned int"
85 #define PTRDIFF_TYPE "int"
88 #define WCHAR_TYPE "int"
91 #define WCHAR_UNSIGNED 0
93 #undef WCHAR_TYPE_SIZE
94 #define WCHAR_TYPE_SIZE 32
96 #define HANDLE_SYSV_PRAGMA
98 /* We don't have any limit on the length as out debugger is GDB. */
99 #undef DBX_CONTIN_LENGTH
101 /* NetBSD does its profiling differently to the Acorn compiler. We
102 don't need a word following the mcount call; and to skip it
103 requires either an assembly stub or use of fomit-frame-pointer when
104 compiling the profiling functions. Since we break Acorn CC
105 compatibility below a little more won't hurt. */
107 #undef FUNCTION_PROFILER
108 #define FUNCTION_PROFILER(STREAM,LABELNO) \
110 fprintf(STREAM, "\tmov\t%sip, %slr\n", REGISTER_PREFIX, REGISTER_PREFIX); \
111 fprintf(STREAM, "\tbl\tmcount\n"); \
114 /* On the ARM `@' introduces a comment, so we must use something else
115 for .type directives. */
116 #undef TYPE_OPERAND_FMT
117 #define TYPE_OPERAND_FMT "%%%s"
119 /* VERY BIG NOTE : Change of structure alignment for RiscBSD.
120 There are consequences you should be aware of...
122 Normally GCC/arm uses a structure alignment of 32 for compatibility
123 with armcc. This means that structures are padded to a word
124 boundary. However this causes problems with bugged NetBSD kernel
125 code (possibly userland code as well - I have not checked every
126 binary). The nature of this bugged code is to rely on sizeof()
127 returning the correct size of various structures rounded to the
128 nearest byte (SCSI and ether code are two examples, the vm system
129 is another). This code breaks when the structure alignment is 32
130 as sizeof() will report a word=rounded size. By changing the
131 structure alignment to 8. GCC will conform to what is expected by
134 This has several side effects that should be considered.
135 1. Structures will only be aligned to the size of the largest member.
136 i.e. structures containing only bytes will be byte aligned.
137 structures containing shorts will be half word alinged.
138 structures containing ints will be word aligned.
140 This means structures should be padded to a word boundary if
141 alignment of 32 is required for byte structures etc.
143 2. A potential performance penalty may exist if strings are no longer
144 word aligned. GCC will not be able to use word load/stores to copy
147 This modification is not encouraged but with the present state of the
148 NetBSD source tree it is currently the only solution that meets the
150 #undef STRUCTURE_SIZE_BOUNDARY
151 #define STRUCTURE_SIZE_BOUNDARY 8