1 /* Definitions for ARM running MINIX using the ELF format 2 Copyright (C) 2001, 2004, 2007 Free Software Foundation, Inc. 3 Contributed by David E. O'Brien <obrien@FreeBSD.org> and BSDi. 4 Adapted for MINIX by Lionel Sambuc <lionel@minix3.org> 5 6 This file is part of GCC. 7 8 GCC is free software; you can redistribute it and/or modify it 9 under the terms of the GNU General Public License as published 10 by the Free Software Foundation; either version 3, or (at your 11 option) any later version. 12 13 GCC is distributed in the hope that it will be useful, but WITHOUT 14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public 16 License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with GCC; see the file COPYING3. If not see 20 <http://www.gnu.org/licenses/>. */ 21 22 #undef MINIX_TARGET_CPU_CPP_BUILTINS 23 #define MINIX_TARGET_CPU_CPP_BUILTINS() \ 24 do \ 25 { \ 26 TARGET_BPABI_CPP_BUILTINS(); \ 27 if (ARM_EABI_UNWIND_TABLES) \ 28 builtin_define ("__UNWIND_TABLES__"); \ 29 } \ 30 while (0) 31 32 /* Define the actual types of some ANSI-mandated types. 33 Needs to agree with <machine/ansi.h>. GCC defaults come from c-decl.c, 34 c-common.c, and config/<arch>/<arch>.h. */ 35 #undef SIZE_TYPE 36 #define SIZE_TYPE "unsigned int" 37 38 #undef PTRDIFF_TYPE 39 #define PTRDIFF_TYPE "int" 40 41 #undef WCHAR_TYPE 42 #define WCHAR_TYPE "int" 43 44 #undef WINT_TYPE 45 #define WINT_TYPE "int" 46 47 /* We don't have any limit on the length as out debugger is GDB. */ 48 #undef DBX_CONTIN_LENGTH 49 50 /* NetBSD does its profiling differently to the Acorn compiler. We 51 don't need a word following the mcount call; and to skip it 52 requires either an assembly stub or use of fomit-frame-pointer when 53 compiling the profiling functions. Since we break Acorn CC 54 compatibility below a little more won't hurt. */ 55 56 #undef ARM_FUNCTION_PROFILER 57 #define ARM_FUNCTION_PROFILER(STREAM,LABELNO) \ 58 { \ 59 asm_fprintf (STREAM, "\tmov\t%Rip, %Rlr\n"); \ 60 asm_fprintf (STREAM, "\tbl\t__mcount%s\n", \ 61 (TARGET_ARM && NEED_PLT_RELOC) \ 62 ? "(PLT)" : ""); \ 63 } 64 65 /* VERY BIG NOTE: Change of structure alignment for NetBSD/arm. 66 There are consequences you should be aware of... 67 68 Normally GCC/arm uses a structure alignment of 32 for compatibility 69 with armcc. This means that structures are padded to a word 70 boundary. However this causes problems with bugged NetBSD kernel 71 code (possibly userland code as well - I have not checked every 72 binary). The nature of this bugged code is to rely on sizeof() 73 returning the correct size of various structures rounded to the 74 nearest byte (SCSI and ether code are two examples, the vm system 75 is another). This code breaks when the structure alignment is 32 76 as sizeof() will report a word=rounded size. By changing the 77 structure alignment to 8. GCC will conform to what is expected by 78 NetBSD. 79 80 This has several side effects that should be considered. 81 1. Structures will only be aligned to the size of the largest member. 82 i.e. structures containing only bytes will be byte aligned. 83 structures containing shorts will be half word aligned. 84 structures containing ints will be word aligned. 85 86 This means structures should be padded to a word boundary if 87 alignment of 32 is required for byte structures etc. 88 89 2. A potential performance penalty may exist if strings are no longer 90 word aligned. GCC will not be able to use word load/stores to copy 91 short strings. 92 93 This modification is not encouraged but with the present state of the 94 NetBSD source tree it is currently the only solution that meets the 95 requirements. */ 96 97 #undef DEFAULT_STRUCTURE_SIZE_BOUNDARY 98 #define DEFAULT_STRUCTURE_SIZE_BOUNDARY 8 99 100 /* Fixed-sized enum by default (-fno-short-enums) */ 101 #undef MINIX_CC1_SPEC 102 #define MINIX_CC1_SPEC "%{!fshort-enums:%{!fno-short-enums:-fno-short-enums}} " 103 104 /* Use by default the new abi and calling standard */ 105 #undef ARM_DEFAULT_ABI 106 #define ARM_DEFAULT_ABI ARM_ABI_AAPCS 107 108 #undef ARM_EABI_UNWIND_TABLES 109 #define ARM_EABI_UNWIND_TABLES 0 110 #undef ARM_UNWIND_INFO 111 #define ARM_UNWIND_INFO 0 112 #undef ARM_DWARF_UNWIND_TABLES 113 #define ARM_DWARF_UNWIND_TABLES 1 114 115 /* LSC: FIXME: When activated, some programs crash on qemu with an illegal 116 * instruction. 117 * The cause is unknown (Missing support on MINIX, missing support 118 * on the emulator, library error...). 119 */ 120 #if 0 121 /* Make sure we use hard-floating point ABI by default */ 122 #undef TARGET_DEFAULT_FLOAT_ABI 123 #define TARGET_DEFAULT_FLOAT_ABI ARM_FLOAT_ABI_HARD 124 #endif 125 126 #if defined(NETBSD_NATIVE) 127 /* LSC: On arm, when compiling statically, we need gcc_eh. */ 128 #undef MINIX_LINK_GCC_C_SEQUENCE_SPEC 129 #define MINIX_LINK_GCC_C_SEQUENCE_SPEC \ 130 "%{static:--start-group} %G %L -lgcc_eh %{static:--end-group}%{!static:%G}" 131 #endif /* defined(NETBSD_NATIVE) */ 132 133 /* Default to full VFP if -mhard-float is specified. */ 134 #undef MINIX_SUBTARGET_ASM_FLOAT_SPEC 135 #define MINIX_SUBTARGET_ASM_FLOAT_SPEC \ 136 "%{mhard-float:%{!mfpu=*:-mfpu=vfpv3-d16}} \ 137 %{mfloat-abi=hard:%{!mfpu=*:-mfpu=vfpv3-d16}}" 138 139 #undef MINIX_SUBTARGET_EXTRA_ASM_SPEC 140 #define MINIX_SUBTARGET_EXTRA_ASM_SPEC \ 141 "%{mabi=apcs-gnu|mabi=atpcs:-meabi=gnu;:-meabi=5}" \ 142 TARGET_FIX_V4BX_SPEC \ 143 "%{fpic|fpie:-k} %{fPIC|fPIE:-k}" 144 145 /* Little endian by default */ 146 #undef TARGET_ENDIAN_DEFAULT 147 #define TARGET_ENDIAN_DEFAULT 0 148 149 #undef SUBTARGET_CPU_DEFAULT 150 #define SUBTARGET_CPU_DEFAULT TARGET_CPU_cortexa8 151