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1 /* Definitions of target machine for GNU compiler, NetBSD/arm ELF version.
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2 Copyright (C) 2002, 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
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3 Contributed by Wasabi Systems, Inc.
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4
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5 This file is part of GCC.
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6
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7 GCC 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
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9 by the Free Software Foundation; either version 3, or (at your
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10 option) any later version.
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11
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12 GCC 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
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14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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15 License 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 GCC; see the file COPYING3. If not see
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19 <http://www.gnu.org/licenses/>. */
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20
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21 /* Run-time Target Specification. */
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22 #undef TARGET_VERSION
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23 #define TARGET_VERSION fputs (" (NetBSD/arm ELF)", stderr);
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24
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25 /* arm.h defaults to ARM6 CPU. */
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26
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27 /* This defaults us to little-endian. */
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28 #ifndef TARGET_ENDIAN_DEFAULT
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29 #define TARGET_ENDIAN_DEFAULT 0
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30 #endif
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31
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32 #undef MULTILIB_DEFAULTS
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33
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34 /* Default it to use ATPCS with soft-VFP. */
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35 #undef TARGET_DEFAULT
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36 #define TARGET_DEFAULT \
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37 (MASK_APCS_FRAME \
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38 | TARGET_ENDIAN_DEFAULT)
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39
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40 #undef ARM_DEFAULT_ABI
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41 #define ARM_DEFAULT_ABI ARM_ABI_ATPCS
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42
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43 #define TARGET_OS_CPP_BUILTINS() \
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44 do \
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45 { \
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46 NETBSD_OS_CPP_BUILTINS_ELF(); \
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47 } \
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48 while (0)
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49
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50 #undef SUBTARGET_CPP_SPEC
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51 #define SUBTARGET_CPP_SPEC NETBSD_CPP_SPEC
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52
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53 #undef SUBTARGET_EXTRA_ASM_SPEC
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54 #define SUBTARGET_EXTRA_ASM_SPEC \
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55 "-matpcs %{fpic|fpie:-k} %{fPIC|fPIE:-k}"
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56
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57 /* Default to full VFP if -mhard-float is specified. */
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58 #undef SUBTARGET_ASM_FLOAT_SPEC
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59 #define SUBTARGET_ASM_FLOAT_SPEC \
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60 "%{mhard-float:{!mfpu=*:-mfpu=vfp}} \
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61 %{mfloat-abi=hard:{!mfpu=*:-mfpu=vfp}}"
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62
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63 #undef SUBTARGET_EXTRA_SPECS
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64 #define SUBTARGET_EXTRA_SPECS \
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65 { "subtarget_extra_asm_spec", SUBTARGET_EXTRA_ASM_SPEC }, \
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66 { "subtarget_asm_float_spec", SUBTARGET_ASM_FLOAT_SPEC }, \
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67 { "netbsd_link_spec", NETBSD_LINK_SPEC_ELF }, \
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68 { "netbsd_entry_point", NETBSD_ENTRY_POINT },
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69
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70 #define NETBSD_ENTRY_POINT "__start"
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71
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72 #undef LINK_SPEC
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73 #define LINK_SPEC \
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74 "-X %{mbig-endian:-EB} %{mlittle-endian:-EL} \
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75 %(netbsd_link_spec)"
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76
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77 /* Make GCC agree with <machine/ansi.h>. */
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78
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79 #undef SIZE_TYPE
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80 #define SIZE_TYPE "long unsigned int"
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81
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82 #undef PTRDIFF_TYPE
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83 #define PTRDIFF_TYPE "long int"
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84
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85 /* We don't have any limit on the length as out debugger is GDB. */
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86 #undef DBX_CONTIN_LENGTH
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87
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88 /* NetBSD does its profiling differently to the Acorn compiler. We
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89 don't need a word following the mcount call; and to skip it
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90 requires either an assembly stub or use of fomit-frame-pointer when
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91 compiling the profiling functions. Since we break Acorn CC
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92 compatibility below a little more won't hurt. */
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93
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94 #undef ARM_FUNCTION_PROFILER
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95 #define ARM_FUNCTION_PROFILER(STREAM,LABELNO) \
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96 { \
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97 asm_fprintf (STREAM, "\tmov\t%Rip, %Rlr\n"); \
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98 asm_fprintf (STREAM, "\tbl\t__mcount%s\n", \
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99 (TARGET_ARM && NEED_PLT_RELOC) \
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100 ? "(PLT)" : ""); \
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101 }
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102
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103 /* VERY BIG NOTE: Change of structure alignment for NetBSD/arm.
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104 There are consequences you should be aware of...
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105
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106 Normally GCC/arm uses a structure alignment of 32 for compatibility
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107 with armcc. This means that structures are padded to a word
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108 boundary. However this causes problems with bugged NetBSD kernel
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109 code (possibly userland code as well - I have not checked every
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110 binary). The nature of this bugged code is to rely on sizeof()
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111 returning the correct size of various structures rounded to the
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112 nearest byte (SCSI and ether code are two examples, the vm system
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113 is another). This code breaks when the structure alignment is 32
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114 as sizeof() will report a word=rounded size. By changing the
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115 structure alignment to 8. GCC will conform to what is expected by
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116 NetBSD.
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117
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118 This has several side effects that should be considered.
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119 1. Structures will only be aligned to the size of the largest member.
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120 i.e. structures containing only bytes will be byte aligned.
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121 structures containing shorts will be half word aligned.
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122 structures containing ints will be word aligned.
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123
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124 This means structures should be padded to a word boundary if
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125 alignment of 32 is required for byte structures etc.
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126
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127 2. A potential performance penalty may exist if strings are no longer
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128 word aligned. GCC will not be able to use word load/stores to copy
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129 short strings.
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130
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131 This modification is not encouraged but with the present state of the
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132 NetBSD source tree it is currently the only solution that meets the
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133 requirements. */
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134
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135 #undef DEFAULT_STRUCTURE_SIZE_BOUNDARY
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136 #define DEFAULT_STRUCTURE_SIZE_BOUNDARY 8
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137
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138 /* Clear the instruction cache from `BEG' to `END'. This makes a
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139 call to the ARM_SYNC_ICACHE architecture specific syscall. */
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140 #define CLEAR_INSN_CACHE(BEG, END) \
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141 do \
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142 { \
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143 extern int sysarch(int number, void *args); \
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144 struct \
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145 { \
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146 unsigned int addr; \
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147 int len; \
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148 } s; \
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149 s.addr = (unsigned int)(BEG); \
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150 s.len = (END) - (BEG); \
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151 (void) sysarch (0, &s); \
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152 } \
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153 while (0)
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154
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155 #undef FPUTYPE_DEFAULT
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156 #define FPUTYPE_DEFAULT FPUTYPE_VFP
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157
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