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1 /* NetBSD/arm a.out version.
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2 Copyright (C) 1993, 1994, 1997, 1998, 2003, 2004, 2005, 2007, 2008
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3 Free Software Foundation, Inc.
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4 Contributed by Mark Brinicombe (amb@physig.ph.kcl.ac.uk)
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5
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6 This file is part of GCC.
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7
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8 GCC is free software; you can redistribute it and/or modify it
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9 under the terms of the GNU General Public License as published
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10 by the Free Software Foundation; either version 3, or (at your
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11 option) any later version.
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12
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13 GCC is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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16 License for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with GCC; see the file COPYING3. If not see
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20 <http://www.gnu.org/licenses/>. */
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21
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22 /* Run-time Target Specification. */
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23 #undef TARGET_VERSION
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24 #define TARGET_VERSION fputs (" (ARM/NetBSD)", stderr);
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25
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26 /* Unsigned chars produces much better code than signed. */
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27 #define DEFAULT_SIGNED_CHAR 0
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28
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29 /* Since we always use GAS as our assembler we support stabs. */
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30 #define DBX_DEBUGGING_INFO 1
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31
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32 /*#undef ASM_DECLARE_FUNCTION_NAME*/
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33
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34 /* ARM6 family default cpu. */
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35 #define SUBTARGET_CPU_DEFAULT TARGET_CPU_arm6
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36
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37 #undef TARGET_DEFAULT
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38 #define TARGET_DEFAULT (MASK_APCS_FRAME)
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39
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40 /* Some defines for CPP.
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41 arm32 is the NetBSD port name, so we always define arm32 and __arm32__. */
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42 #define TARGET_OS_CPP_BUILTINS() \
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43 do { \
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44 NETBSD_OS_CPP_BUILTINS_AOUT(); \
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45 builtin_define_std ("arm32"); \
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46 builtin_define_std ("unix"); \
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47 builtin_define_std ("riscbsd"); \
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48 } while (0)
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49
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50 #undef SUBTARGET_EXTRA_SPECS
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51 #define SUBTARGET_EXTRA_SPECS \
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52 { "netbsd_cpp_spec", NETBSD_CPP_SPEC }, \
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53 { "netbsd_link_spec", NETBSD_LINK_SPEC_AOUT },
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54
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55 #undef CPP_SPEC
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56 #define CPP_SPEC "\
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57 %(cpp_cpu_arch) %(cpp_float) %(cpp_endian) %(netbsd_cpp_spec) \
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58 "
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59
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60 /* Because TARGET_DEFAULT sets MASK_SOFT_FLOAT */
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61 #undef CPP_FLOAT_DEFAULT_SPEC
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62 #define CPP_FLOAT_DEFAULT_SPEC "-D__SOFTFP__"
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63
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64 /* Pass -X to the linker so that it will strip symbols starting with 'L' */
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65 #undef LINK_SPEC
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66 #define LINK_SPEC "-X %(netbsd_link_spec)"
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67
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68 #undef SIZE_TYPE
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69 #define SIZE_TYPE "unsigned int"
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70
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71 #undef PTRDIFF_TYPE
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72 #define PTRDIFF_TYPE "int"
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73
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74 #define HANDLE_SYSV_PRAGMA 1
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75
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76 /* We don't have any limit on the length as out debugger is GDB. */
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77 #undef DBX_CONTIN_LENGTH
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78
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79 /* NetBSD does its profiling differently to the Acorn compiler. We
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80 don't need a word following the mcount call; and to skip it
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81 requires either an assembly stub or use of fomit-frame-pointer when
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82 compiling the profiling functions. Since we break Acorn CC
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83 compatibility below a little more won't hurt. */
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84
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85 #undef ARM_FUNCTION_PROFILER
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86 #define ARM_FUNCTION_PROFILER(STREAM,LABELNO) \
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87 { \
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88 fprintf(STREAM, "\tmov\t%sip, %slr\n", REGISTER_PREFIX, REGISTER_PREFIX); \
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89 fprintf(STREAM, "\tbl\tmcount\n"); \
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90 }
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91
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92 /* On the ARM `@' introduces a comment, so we must use something else
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93 for .type directives. */
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94 #undef TYPE_OPERAND_FMT
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95 #define TYPE_OPERAND_FMT "%%%s"
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96
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97 /* NetBSD uses the old PCC style aggregate returning conventions. */
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98 #undef DEFAULT_PCC_STRUCT_RETURN
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99 #define DEFAULT_PCC_STRUCT_RETURN 1
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100
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101 /* Although not normally relevant (since by default, all aggregates
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102 are returned in memory) compiling some parts of libc requires
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103 non-APCS style struct returns. */
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104 #undef TARGET_RETURN_IN_MEMORY
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105
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106 /* VERY BIG NOTE : Change of structure alignment for RiscBSD.
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107 There are consequences you should be aware of...
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108
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109 Normally GCC/arm uses a structure alignment of 32 for compatibility
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110 with armcc. This means that structures are padded to a word
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111 boundary. However this causes problems with bugged NetBSD kernel
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112 code (possibly userland code as well - I have not checked every
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113 binary). The nature of this bugged code is to rely on sizeof()
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114 returning the correct size of various structures rounded to the
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115 nearest byte (SCSI and ether code are two examples, the vm system
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116 is another). This code breaks when the structure alignment is 32
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117 as sizeof() will report a word=rounded size. By changing the
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118 structure alignment to 8. GCC will conform to what is expected by
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119 NetBSD.
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120
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121 This has several side effects that should be considered.
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122 1. Structures will only be aligned to the size of the largest member.
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123 i.e. structures containing only bytes will be byte aligned.
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124 structures containing shorts will be half word aligned.
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125 structures containing ints will be word aligned.
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126
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127 This means structures should be padded to a word boundary if
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128 alignment of 32 is required for byte structures etc.
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129
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130 2. A potential performance penalty may exist if strings are no longer
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131 word aligned. GCC will not be able to use word load/stores to copy
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132 short strings.
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133
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134 This modification is not encouraged but with the present state of the
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135 NetBSD source tree it is currently the only solution that meets the
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136 requirements. */
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137 #undef DEFAULT_STRUCTURE_SIZE_BOUNDARY
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138 #define DEFAULT_STRUCTURE_SIZE_BOUNDARY 8
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139
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140 /* Clear the instruction cache from `BEG' to `END'. This makes a
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141 call to the ARM32_SYNC_ICACHE architecture specific syscall. */
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142 #define CLEAR_INSN_CACHE(BEG, END) \
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143 { \
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144 extern int sysarch(int number, void *args); \
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145 struct { \
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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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