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1 /* Copyright (C) 2001, 2002 Free Software Foundation, Inc.
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2 Contributed by Hans-Peter Nilsson <hp@bitrange.com>
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3
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4 This file is free software; you can redistribute it and/or modify it
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5 under the terms of the GNU General Public License as published by the
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6 Free Software Foundation; either version 3, or (at your option) any
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7 later version.
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8
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9 This file is distributed in the hope that it will be useful, but
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10 WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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12 General Public License for more details.
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13
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14 Under Section 7 of GPL version 3, you are granted additional
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15 permissions described in the GCC Runtime Library Exception, version
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16 3.1, as published by the Free Software Foundation.
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17
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18 You should have received a copy of the GNU General Public License and
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19 a copy of the GCC Runtime Library Exception along with this program;
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20 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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21 <http://www.gnu.org/licenses/>. */
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22
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23 % This is the crt0 equivalent for mmix-knuth-mmixware, for setting up
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24 % things for compiler-generated assembly-code and for setting up things
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25 % between where the simulator calls and main, and shutting things down on
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26 % the way back. There's an actual crt0.o elsewhere, but that's a dummy.
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27
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28 % This file and the GCC output are supposed to be *reasonably*
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29 % mmixal-compatible to enable people to re-use output with Knuth's mmixal.
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30 % However, forward references are used more freely: we are using the
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31 % binutils tools. Users of mmixal beware; you will sometimes have to
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32 % re-order things or use temporary variables.
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33
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34 % Users of mmixal will want to set up 8H and 9H to be .text and .data
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35 % respectively, so the compiler can switch between them pretending they're
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36 % segments.
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37
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38 % This little treasure is here so the 32 lowest address bits of user data
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39 % will not be zero. Because of truncation, that would cause testcase
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40 % gcc.c-torture/execute/980701-1.c to incorrectly fail.
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41
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42 .data ! mmixal:= 8H LOC Data_Segment
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43 .p2align 3
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44 LOC @+(8-@)@7
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45 OCTA 2009
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46
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47 .text ! mmixal:= 9H LOC 8B; LOC #100
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48 .global Main
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49
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50 % The __Stack_start symbol is provided by the link script.
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51 stackpp OCTA __Stack_start
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52
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53 % "Main" is the magic symbol the simulator jumps to. We want to go
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54 % on to "main".
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55 % We need to set rG explicitly to avoid hard-to-debug situations.
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56 Main SETL $255,32
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57 PUT rG,$255
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58
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59 % Initialize the stack pointer. It is supposedly made a global
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60 % zero-initialized (allowed to change) register in crtn.asm; we use the
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61 % explicit number.
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62 GETA $255,stackpp
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63 LDOU $254,$255,0
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64
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65 % Make sure we get more than one mem, to simplify counting cycles.
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66 LDBU $255,$1,0
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67 LDBU $255,$1,1
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68
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69 PUSHJ $2,_init
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70
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71 #ifdef __MMIX_ABI_GNU__
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72 % Copy argc and argv from their initial position to argument registers
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73 % where necessary.
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74 SET $231,$0
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75 SET $232,$1
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76 #else
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77 % For the mmixware ABI, we need to move arguments. The return value will
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78 % appear in $0.
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79 SET $2,$1
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80 SET $1,$0
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81 #endif
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82
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83 PUSHJ $0,main
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84 JMP exit
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85
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86 % Provide the first part of _init and _fini. Save the return address on the
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87 % register stack. We eventually ignore the return address of these
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88 % PUSHJ:s, so it doesn't matter that whether .init and .fini code calls
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89 % functions or where they store rJ. We shouldn't get there, so die
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90 % (TRAP Halt) if that happens.
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91
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92 .section .init,"ax",@progbits
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93 .global _init
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94 _init:
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95 GET $0,:rJ
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96 PUSHJ $1,0F
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97 SETL $255,255
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98 TRAP 0,0,0
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99 0H IS @
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100
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101 % Register _fini to be executed as the last atexit function.
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102 #ifdef __MMIX_ABI_GNU__
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103 GETA $231,_fini
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104 #else
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105 GETA $1,_fini
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106 #endif
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107 PUSHJ $0,atexit
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108
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109 .section .fini,"ax",@progbits
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110 .global _fini
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111 _fini:
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112 GET $0,:rJ
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113 PUSHJ $1,0F
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114 SETL $255,255
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115 TRAP 0,0,0
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116 0H IS @
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