[444] | 1 | # Copyright (c) 2003 Red Hat, Inc. All rights reserved. |
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| 2 | # |
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| 3 | # This copyrighted material is made available to anyone wishing to use, modify, |
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| 4 | # copy, or redistribute it subject to the terms and conditions of the BSD |
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| 5 | # License. This program is distributed in the hope that it will be useful, |
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| 6 | # but WITHOUT ANY WARRANTY expressed or implied, including the implied |
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| 7 | # warranties of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. A copy of |
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| 8 | # this license is available at http://www.opensource.org/licenses. Any Red Hat |
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| 9 | # trademarks that are incorporated in the source code or documentation are not |
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| 10 | # subject to the BSD License and may only be used or replicated with the express |
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| 11 | # permission of Red Hat, Inc. |
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| 12 | # |
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| 13 | # Toshiba Media Processor startup file (crt0.S) |
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| 14 | # |
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| 15 | # Designed for user programs running in the 0-2Mb startup section. |
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| 16 | # Designed for the simulator by default. |
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| 17 | # |
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| 18 | # Exception/Interrupt Handler Locations |
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| 19 | # CFG.EVM CFG.EVA CFG.IVA Exception INTn |
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| 20 | ## 0 - - 0x0000_0000 0x0000_0030 rom |
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| 21 | ## 1 0 0 0x0020_0000 0x0020_0030 local RAM / local RAM |
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| 22 | ## 1 1 0 0x0080_0000 0x0020_0000 ext RAM / local RAM |
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| 23 | ## 1 0 1 0x0020_0000 0x0080_0000 local RAM / ext RAM |
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| 24 | ## 1 1 1 0x0080_0000 0x0080_0030 ext RAM / ext RAM |
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| 25 | # |
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| 26 | # Exceptions |
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| 27 | # Reset 0x0000_0000 |
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| 28 | # NMI 0x0000_0000+4 |
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| 29 | # RI (Base Address) +0x08 |
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| 30 | # ZDIV (Base Address) +0x0C |
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| 31 | # BRK (Base Address) +0x10 |
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| 32 | # SWI (Base Address) +0x14 |
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| 33 | # DSP (Base Address) +0x1C |
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| 34 | # COP (Base Address) +0x20 |
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| 35 | |
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| 36 | .set _local_ram_base, 0x00200000 |
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| 37 | .set _ext_ram_base, 0x00800000 |
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| 38 | .set _int_base_offset, 0x30 |
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| 39 | |
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| 40 | #include "syscall.h" |
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| 41 | |
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| 42 | .macro if_bitfield_zero reg, start, length, label |
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| 43 | ldc $0, \reg |
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| 44 | srl $0, \start |
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| 45 | and3 $0, $0, (1 << \length) - 1 |
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| 46 | beqz $0,\label |
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| 47 | .endm |
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| 48 | |
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| 49 | .macro if_bitfield_notN reg, start, length, N, label |
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| 50 | ldc $0, \reg |
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| 51 | srl $0, \start |
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| 52 | and3 $0, $0, (1 << \length) - 1 |
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| 53 | bnei $0,\N, \label |
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| 54 | .endm |
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| 55 | |
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| 56 | .macro if_bitfield_eqN reg, start, length, N, label |
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| 57 | ldc $0, \reg |
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| 58 | srl $0, \start |
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| 59 | and3 $0, $0, (1 << \length) - 1 |
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| 60 | beqi $0,\N, \label |
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| 61 | .endm |
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| 62 | |
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| 63 | .macro if_bitfield_ltN reg, start, length, N, label |
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| 64 | ldc $0, \reg |
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| 65 | srl $0, \start |
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| 66 | and3 $0, $0, (1 << \length) - 1 |
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| 67 | blti $0,\N, \label |
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| 68 | .endm |
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| 69 | |
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| 70 | .section .hwinit, "ax" |
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| 71 | # CCFG.ICSZ |
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| 72 | if_bitfield_zero reg=$ccfg, start=16, length=7, label=.Lend_enable_icache |
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| 73 | __enable_icache: |
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| 74 | # set ICE(cfg[1]) |
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| 75 | ldc $1,$cfg |
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| 76 | or3 $1,$1,2 |
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| 77 | stc $1,$cfg |
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| 78 | nop |
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| 79 | nop |
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| 80 | nop |
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| 81 | nop |
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| 82 | nop |
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| 83 | .Lend_enable_icache: |
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| 84 | ret |
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| 85 | |
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| 86 | __enable_dcache: |
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| 87 | # CCFG.DCSZ |
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| 88 | if_bitfield_zero reg=$ccfg, start=0, length=7, label=.Lend_enable_dcache |
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| 89 | # set DCE(cfg[0]) |
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| 90 | ldc $1,$cfg |
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| 91 | or3 $1,$1,1 |
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| 92 | stc $1,$cfg |
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| 93 | nop |
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| 94 | nop |
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| 95 | nop |
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| 96 | nop |
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| 97 | nop |
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| 98 | ret |
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| 99 | .Lend_enable_dcache: |
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| 100 | |
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| 101 | .text |
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| 102 | |
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| 103 | #ifdef NOVEC |
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| 104 | .global _reset |
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| 105 | _reset: |
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| 106 | #endif |
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| 107 | |
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| 108 | .global _start |
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| 109 | _start: |
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| 110 | mov $fp, 0 # for unwinding |
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| 111 | |
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| 112 | # $sp set |
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| 113 | movh $sp, %uhi(__stack_table) |
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| 114 | or3 $sp, $sp, %lo(__stack_table) |
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| 115 | |
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| 116 | # initialize sp, gp, tp |
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| 117 | # get CPU ID |
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| 118 | ldc $0, $id |
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| 119 | srl $0, 16 |
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| 120 | |
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| 121 | # load ID-specific stack pointer |
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| 122 | sl2ad3 $0, $0, $sp # $0 = ($0 << 2) + $sp |
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| 123 | lw $sp,($0) # $sp = *($0) |
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| 124 | mov $0,0xfffffff8 |
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| 125 | and $sp, $0 |
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| 126 | |
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| 127 | #ifndef NOVEC |
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| 128 | # copy exception vector table |
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| 129 | |
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| 130 | # RCFG.IRSZ |
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| 131 | if_bitfield_zero reg=$rcfg, start=16, length=7, label=.Lend_ev_imem |
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| 132 | # handle imem |
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| 133 | movh $11,%uhi(_local_ram_base) |
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| 134 | or3 $11,$11,%lo(_local_ram_base) |
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| 135 | # clear CFG.EVA ([23]) |
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| 136 | ldc $0,$cfg |
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| 137 | movh $1, %uhi(0xff7fffff) |
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| 138 | or3 $1, $1, %lo(0xff7fffff) |
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| 139 | and $0,$1 |
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| 140 | stc $0,$cfg |
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| 141 | bra .Ldo_repeat_ev |
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| 142 | .Lend_ev_imem: |
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| 143 | #ifdef UseSDRAM |
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| 144 | movh $11,%uhi(_ext_ram_base) |
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| 145 | or3 $11,$11,%lo(_ext_ram_base) |
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| 146 | # set CFG.EVA ([23]) |
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| 147 | ldc $0,$cfg |
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| 148 | movh $1,%uhi(1<<23) |
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| 149 | or3 $1,$1,%lo(1<<23) |
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| 150 | or $0,$1 |
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| 151 | stc $0,$cfg |
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| 152 | #else |
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| 153 | # handle ROM |
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| 154 | bra .Lend_ev |
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| 155 | #endif |
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| 156 | .Ldo_repeat_ev: |
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| 157 | # set CFG.EVM ([4]) |
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| 158 | ldc $0,$cfg |
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| 159 | or3 $0,$0,(1<<4) |
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| 160 | stc $0,$cfg |
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| 161 | # copy _exception_table to $11 |
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| 162 | movh $12,%uhi(_exception_table) |
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| 163 | or3 $12,$12,%lo(_exception_table) |
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| 164 | mov $13,8 |
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| 165 | repeat $13,.Lrepeat_ev |
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| 166 | lw $1,0($12) |
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| 167 | add $12,4 |
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| 168 | .Lrepeat_ev: |
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| 169 | sw $1,0($11) |
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| 170 | add $11,4 |
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| 171 | .Lend_ev: |
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| 172 | |
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| 173 | # copy interrupt vector table |
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| 174 | # RCFG.IRSZ |
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| 175 | if_bitfield_zero reg=$rcfg, start=16, length=7, label=.Lend_iv_imem |
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| 176 | # handle imem |
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| 177 | movh $11,%uhi(_local_ram_base) |
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| 178 | or3 $11,$11,%lo(_int_base_offset) |
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| 179 | # clear CFG.IVA ([22]) |
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| 180 | ldc $0,$cfg |
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| 181 | movh $1,%uhi(0xffbfffff) # ~(1<<22) |
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| 182 | or3 $1,$1,%lo(0xffbfffff) |
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| 183 | and $0,$1 |
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| 184 | stc $0,$cfg |
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| 185 | bra .Ldo_repeat_iv |
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| 186 | .Lend_iv_imem: |
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| 187 | #ifdef UseSDRAM |
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| 188 | movh $11,%uhi(_ext_ram_base) |
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| 189 | or3 $11,$11,%lo(_int_base_offset) |
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| 190 | # set CFG. IVA ([22]) |
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| 191 | ldc $0,$cfg |
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| 192 | movh $1,%uhi(1<<22) |
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| 193 | or3 $1,$1,%lo(1<<22) |
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| 194 | or $0,$1 |
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| 195 | stc $0,$cfg |
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| 196 | #else |
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| 197 | # handle ROM |
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| 198 | bra .Lend_iv |
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| 199 | #endif |
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| 200 | .Ldo_repeat_iv: |
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| 201 | # set CFG.IVM ([3]) |
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| 202 | ldc $0,$cfg |
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| 203 | or3 $0,$0,(1<<3) |
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| 204 | stc $0,$cfg |
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| 205 | # copy _interrupt_table to $11 |
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| 206 | movh $12,%uhi(_interrupt_table) |
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| 207 | or3 $12,$12,%lo(_interrupt_table) |
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| 208 | mov $13,32 |
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| 209 | add $13,-1 |
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| 210 | and3 $13,$13,127 |
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| 211 | repeat $13,.Lrepeat_iv |
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| 212 | lw $1,0($12) |
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| 213 | add $12,4 |
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| 214 | .Lrepeat_iv: |
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| 215 | sw $1,0($11) |
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| 216 | add $11,4 |
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| 217 | .Lend_iv: |
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| 218 | |
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| 219 | # initialize instruction cache |
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| 220 | # Icache Size CCFG.ICSZ ([22..16]) KByte |
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| 221 | if_bitfield_zero reg=$ccfg, start=16, length=7, label=.Lend_ic |
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| 222 | mov $3,$0 # cache size in KB |
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| 223 | # ID.ID |
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| 224 | if_bitfield_ltN reg=$ID, start=8, length=8, N=3, label=.Lend_mepc3_ic |
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| 225 | # Line Size CCFG.ICSZ ([26..24]) Byte |
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| 226 | if_bitfield_ltN reg=$ccfg, start=24, length=3, N=2, label=.Lend_ic |
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| 227 | bgei $0,5,.Lend_ic |
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| 228 | |
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| 229 | add3 $1,$0,3 # bit width of line size |
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| 230 | mov $0,$3 |
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| 231 | # clear tag |
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| 232 | mov $2,10 |
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| 233 | sub $2,$1 |
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| 234 | sll $0,$2 # *KByte/(line size) |
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| 235 | add $0,-1 |
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| 236 | mov $2,1 |
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| 237 | sll $2,$1 # line size |
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| 238 | bra .Ldo_repeat_icache |
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| 239 | .Lend_mepc3_ic: |
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| 240 | # ICache: $0 KByte |
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| 241 | mov $0,$3 |
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| 242 | # clear tag |
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| 243 | sll $0,(10-5) # *KByte/(32byte=linesize) |
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| 244 | add $0,-1 |
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| 245 | mov $2,32 |
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| 246 | .Ldo_repeat_icache: |
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| 247 | mov $1,0 |
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| 248 | bra 0f |
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| 249 | # Align this code on an 8 byte boundary in order to keep the repeat |
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| 250 | # loop entirely within the instruction fetch buffer. |
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| 251 | .p2align 3 |
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| 252 | 0: |
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| 253 | movh $3,%hi(0x00310000) # for tag |
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| 254 | repeat $0,.Lrepeat_icache |
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| 255 | add $0,-1 |
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| 256 | .Lrepeat_icache: |
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| 257 | sw $1,0($3) |
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| 258 | add3 $3,$3,$2 |
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| 259 | .Lenable_icache: |
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| 260 | movh $1,%hi(__enable_icache) |
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| 261 | add3 $1,$1,%lo(__enable_icache) |
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| 262 | jsr $1 |
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| 263 | .Lend_ic: |
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| 264 | |
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| 265 | # initialize data cache |
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| 266 | # Dcache Size CCFG.DCSZ ([6..0]) KByte |
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| 267 | if_bitfield_zero reg=$ccfg, start=0, length=7, label=.Lend_dc |
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| 268 | mov $3,$0 # cache size in KB |
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| 269 | # ID.ID |
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| 270 | if_bitfield_ltN reg=$ID, start=8, length=8, N=3, label=.Lend_mepc3_dc |
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| 271 | # Line Size CCFG.DCSZ ([10..8]) Byte |
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| 272 | if_bitfield_ltN reg=$ccfg, start=8, length=3, N=2, label=.Lend_dc |
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| 273 | bgei $0,5,.Lend_dc |
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| 274 | |
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| 275 | add3 $1,$0,3 # bit width of line size |
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| 276 | mov $0,$3 |
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| 277 | # clear tag |
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| 278 | mov $2,10 |
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| 279 | sub $2,$1 |
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| 280 | sll $0,$2 # *KByte/(line size) |
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| 281 | add $0,-1 |
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| 282 | mov $2,1 |
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| 283 | sll $2,$1 # line size |
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| 284 | bra .Ldo_repeat_dcache |
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| 285 | .Lend_mepc3_dc: |
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| 286 | # DCache: $0 KByte |
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| 287 | mov $0,$3 |
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| 288 | # clear tag |
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| 289 | sll $0,(10-5) # *KByte/(32byte=linesize) |
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| 290 | add $0,-1 |
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| 291 | mov $2,32 |
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| 292 | .Ldo_repeat_dcache: |
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| 293 | mov $1,0 |
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| 294 | movh $3,%hi(0x00330000) # for tag |
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| 295 | |
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| 296 | repeat $0,.Lrepeat_dcache |
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| 297 | add $0,-1 |
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| 298 | .Lrepeat_dcache: |
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| 299 | sw $1,0($3) |
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| 300 | add3 $3,$3,$2 |
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| 301 | .Lenable_dcache: |
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| 302 | movh $1,%hi(__enable_dcache) |
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| 303 | add3 $1,$1,%lo(__enable_dcache) |
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| 304 | jsr $1 |
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| 305 | .Lend_dc: |
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| 306 | # NOVEC |
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| 307 | #endif |
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| 308 | mov $0, 0 |
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| 309 | |
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| 310 | movh $gp, %uhi(__sdabase) |
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| 311 | or3 $gp, $gp, %lo(__sdabase) |
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| 312 | |
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| 313 | movh $tp, %uhi(__tpbase) |
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| 314 | or3 $tp, $tp, %lo(__tpbase) |
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| 315 | |
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| 316 | # zero out BSS |
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| 317 | movh $1, %uhi(__bss_start) |
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| 318 | or3 $1, $1, %lo(__bss_start) |
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| 319 | mov $2, 0 |
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| 320 | movh $3, %uhi(_end) |
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| 321 | or3 $3, $3, %lo(_end) |
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| 322 | sub $3, $1 |
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| 323 | bsr memset |
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| 324 | |
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| 325 | movh $1, %uhi(__sbss_start) |
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| 326 | or3 $1, $1, %lo(__sbss_start) |
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| 327 | mov $2, 0 |
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| 328 | movh $3, %uhi(__sbss_end) |
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| 329 | or3 $3, $3, %lo(__sbss_end) |
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| 330 | sub $3, $1 |
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| 331 | bsr memset |
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| 332 | |
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| 333 | movh $1, %uhi(__farbss_start) |
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| 334 | or3 $1, $1, %lo(__farbss_start) |
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| 335 | mov $2, 0 |
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| 336 | movh $3, %uhi(__farbss_end) |
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| 337 | or3 $3, $3, %lo(__farbss_end) |
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| 338 | sub $3, $1 |
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| 339 | bsr memset |
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| 340 | |
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| 341 | # enable interrupts |
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| 342 | ei |
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| 343 | |
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| 344 | # construct global class variables |
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| 345 | bsr __invoke_init_section |
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| 346 | |
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| 347 | # invoke main |
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| 348 | mov $1, 0 # argc, argv, envp |
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| 349 | mov $2, 0 |
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| 350 | mov $3, 0 |
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| 351 | bsr main |
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| 352 | mov $1, $0 |
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| 353 | bsr exit |
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| 354 | |
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| 355 | .global _exit |
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| 356 | _exit: |
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| 357 | # Prevent _exit recursion |
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| 358 | movh $3, %uhi(_exit_in_progress) |
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| 359 | or3 $3, $3, %lo(_exit_in_progress) |
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| 360 | lw $5, ($3) |
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| 361 | bnez $5, _skip_fini |
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| 362 | mov $5, 1 |
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| 363 | sw $5, ($3) |
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| 364 | |
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| 365 | # We don't need to preserve $5 because we're going to exit anyway. |
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| 366 | mov $5,$1 |
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| 367 | |
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| 368 | # destruct global class variables |
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| 369 | bsr __invoke_fini_section |
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| 370 | mov $1,$5 |
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| 371 | |
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| 372 | _skip_fini: |
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| 373 | |
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| 374 | #ifdef NOSIM |
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| 375 | _exit_loop: |
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| 376 | bra _exit_loop |
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| 377 | #else |
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| 378 | .2byte 0x7800 | ((SYS_exit & 0xe) << 7) | ((SYS_exit & 1) << 4) |
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| 379 | ret |
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| 380 | #endif |
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| 381 | |
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| 382 | .data |
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| 383 | _exit_in_progress: .word 0 |
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| 384 | |
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| 385 | |
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| 386 | |
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| 387 | # For these two, the epilogue is in crtn.S |
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| 388 | |
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| 389 | .section .init |
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| 390 | __invoke_init_section: |
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| 391 | add $sp, -8 |
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| 392 | ldc $0, $lp |
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| 393 | sw $0, ($sp) |
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| 394 | |
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| 395 | .section .fini |
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| 396 | __invoke_fini_section: |
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| 397 | add $sp, -8 |
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| 398 | ldc $0, $lp |
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| 399 | sw $0, ($sp) |
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| 400 | |
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| 401 | #ifndef NOVEC |
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| 402 | .section .vec, "ax" |
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| 403 | .core |
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| 404 | .org 0x0, 0 |
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| 405 | .global _exception_table |
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| 406 | .type _exception_table,@function |
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| 407 | _exception_table: |
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| 408 | .p2align 2 |
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| 409 | .org 0x0000, 0 |
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| 410 | .global _reset |
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| 411 | _reset: |
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| 412 | jmp _handler_RESET |
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| 413 | .org 0x0004, 0 |
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| 414 | jmp _handler_NMI |
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| 415 | .org 0x0008, 0 |
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| 416 | jmp _handler_RI |
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| 417 | .org 0x000c, 0 |
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| 418 | jmp _handler_ZDIV |
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| 419 | .org 0x0010, 0 |
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| 420 | jmp _handler_BRK |
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| 421 | .org 0x0014, 0 |
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| 422 | jmp _handler_SWI |
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| 423 | .org 0x0018, 0 |
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| 424 | jmp _handler_DEBUG |
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| 425 | .org 0x001c, 0 |
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| 426 | jmp _handler_DSP |
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| 427 | .org 0x0020, 0 |
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| 428 | jmp _handler_COP |
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| 429 | |
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| 430 | .org 0x30, 0 |
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| 431 | .global _interrupt_table |
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| 432 | .type _interrupt_table,@function |
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| 433 | _interrupt_table: |
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| 434 | .org 0x0030 |
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| 435 | jmp _handler_INT0 |
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| 436 | .org 0x0034 |
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| 437 | jmp _handler_INT1 |
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| 438 | .org 0x0038 |
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| 439 | jmp _handler_INT2 |
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| 440 | .org 0x003c |
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| 441 | jmp _handler_INT3 |
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| 442 | .org 0x0040 |
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| 443 | jmp _handler_INT4 |
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| 444 | .org 0x0044 |
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| 445 | jmp _handler_INT5 |
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| 446 | .org 0x0048 |
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| 447 | jmp _handler_INT6 |
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| 448 | .org 0x004c |
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| 449 | jmp _handler_INT7 |
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| 450 | .org 0x0050 |
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| 451 | jmp _handler_INT8 |
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| 452 | .org 0x0054 |
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| 453 | jmp _handler_INT9 |
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| 454 | .org 0x0058 |
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| 455 | jmp _handler_INT10 |
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| 456 | .org 0x005c |
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| 457 | jmp _handler_INT11 |
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| 458 | .org 0x0060 |
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| 459 | jmp _handler_INT12 |
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| 460 | .org 0x0064 |
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| 461 | jmp _handler_INT13 |
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| 462 | .org 0x0068 |
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| 463 | jmp _handler_INT14 |
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| 464 | .org 0x006c |
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| 465 | jmp _handler_INT15 |
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| 466 | .org 0x0070 |
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| 467 | jmp _handler_INT16 |
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| 468 | .org 0x0074 |
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| 469 | jmp _handler_INT17 |
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| 470 | .org 0x0078 |
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| 471 | jmp _handler_INT18 |
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| 472 | .org 0x007c |
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| 473 | jmp _handler_INT19 |
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| 474 | .org 0x0080 |
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| 475 | jmp _handler_INT20 |
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| 476 | .org 0x0084 |
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| 477 | jmp _handler_INT21 |
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| 478 | .org 0x0088 |
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| 479 | jmp _handler_INT22 |
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| 480 | .org 0x008c |
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| 481 | jmp _handler_INT23 |
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| 482 | .org 0x0090 |
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| 483 | jmp _handler_INT24 |
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| 484 | .org 0x0094 |
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| 485 | jmp _handler_INT25 |
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| 486 | .org 0x0098 |
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| 487 | jmp _handler_INT26 |
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| 488 | .org 0x009c |
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| 489 | jmp _handler_INT27 |
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| 490 | .org 0x00a0 |
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| 491 | jmp _handler_INT28 |
---|
| 492 | .org 0x00a4 |
---|
| 493 | jmp _handler_INT29 |
---|
| 494 | .org 0x00a8 |
---|
| 495 | jmp _handler_INT30 |
---|
| 496 | .org 0x00ac |
---|
| 497 | jmp _handler_INT31 |
---|
| 498 | # NOVEC |
---|
| 499 | #endif |
---|