[d6b2bba] | 1 | ; /* @(#)register.s 1.1 96/05/23 08:57:34, TEI */ |
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| 2 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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| 3 | ; Register Definitions and Usage Conventions |
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| 4 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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| 5 | ; /* $Id$ */ |
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| 6 | ; |
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| 7 | |
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| 8 | ;* File information and includes. |
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| 9 | |
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| 10 | .file "c_register.s" |
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| 11 | .ident "@(#)register.s 1.1 96/05/23 08:57:34, TEI\n" |
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| 12 | |
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| 13 | ; Basic guidelines for register distribution and usage are derived from |
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| 14 | ; the AMD application notes. It would be best to stick with the conventions |
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| 15 | ; laid out by AMD. |
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| 16 | ; Application Note: Context Switching with 29000 Processor By Daniel Mann. |
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| 17 | |
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| 18 | ; |
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| 19 | ;************************************************************************* |
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| 20 | ; |
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| 21 | |
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| 22 | ; |
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| 23 | ; Rule 1: |
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| 24 | ; Gr1 is used as a pointer to the register stack |
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| 25 | ; Lr1 is used as frame pointer |
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| 26 | ; |
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| 27 | |
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| 28 | .reg regsp, gr1 ; Register Stack Pointer |
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| 29 | .reg fp, lr1 ; frame pointer |
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| 30 | |
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| 31 | .equ Rrsp, ®sp |
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| 32 | .equ Rfp, &fp |
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| 33 | |
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| 34 | .global Rrsp, Rfp |
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| 35 | |
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| 36 | ; |
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| 37 | ;************************************************************************* |
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| 38 | ; |
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| 39 | |
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| 40 | ; |
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| 41 | ; Gr2-Gr63 are not implemented in silicon |
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| 42 | ; |
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| 43 | |
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| 44 | ; |
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| 45 | ;************************************************************************* |
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| 46 | ; |
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| 47 | |
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| 48 | ; |
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| 49 | ; Rule 2: |
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| 50 | ; The registers GR64-GR95 are dedicated for operating system use. |
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| 51 | ; |
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| 52 | |
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| 53 | ; The register range GR64-GR95 i.e 32 Registers is furthur sub-divided as |
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| 54 | ; follows... |
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| 55 | ; gr64-gr67 interrupt handlers. |
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| 56 | ; gr68-gr71 OS temporaries I |
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| 57 | ; gr72-gr79 OS temporaries II |
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| 58 | ; gr80-gr95 OS statics. Dedicated throughout the operation of a program. |
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| 59 | |
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| 60 | |
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| 61 | ; |
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| 62 | ; 32 Registers for Operating System Use. |
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| 63 | ; |
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| 64 | |
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| 65 | ; |
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| 66 | ; Assigning Names to Interrupt Handlers Registers. |
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| 67 | ; |
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| 68 | |
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| 69 | .reg OSint0, gr64 |
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| 70 | .reg OSint1, gr65 |
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| 71 | .reg OSint2, gr66 |
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| 72 | .reg OSint3, gr67 |
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| 73 | |
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| 74 | .equ ROSint0, &OSint0 |
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| 75 | .equ ROSint1, &OSint1 |
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| 76 | .equ ROSint2, &OSint2 |
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| 77 | .equ ROSint3, &OSint3 |
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| 78 | |
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| 79 | .global ROSint0, ROSint1, ROSint2, ROSint3 |
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| 80 | |
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| 81 | .reg TrapReg, gr64 ; trap register |
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| 82 | .reg trapreg, gr64 ; trapreg |
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| 83 | |
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| 84 | .equ RTrapReg, &TrapReg |
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| 85 | .equ Rtrapreg, &trapreg |
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| 86 | |
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| 87 | .global RTrapReg, Rtrapreg |
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| 88 | |
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| 89 | |
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| 90 | ; |
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| 91 | ; Assigning Names to Scratch/Temporary Registers. |
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| 92 | ; |
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| 93 | |
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| 94 | .reg OStmp0, gr68 |
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| 95 | .reg OStmp1, gr69 |
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| 96 | .reg OStmp2, gr70 |
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| 97 | .reg OStmp3, gr71 |
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| 98 | |
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| 99 | .reg OStmp4, gr72 |
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| 100 | .reg OStmp5, gr73 |
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| 101 | .reg OStmp6, gr74 |
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| 102 | .reg OStmp7, gr75 |
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| 103 | |
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| 104 | .reg OStmp8, gr76 |
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| 105 | .reg OStmp9, gr77 |
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| 106 | .reg OStmp10, gr78 |
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| 107 | .reg OStmp11, gr79 |
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| 108 | |
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| 109 | .equ ROStmp0, &OStmp0 |
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| 110 | .equ ROStmp1, &OStmp1 |
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| 111 | .equ ROStmp2, &OStmp2 |
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| 112 | .equ ROStmp3, &OStmp3 |
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| 113 | |
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| 114 | .equ ROStmp4, &OStmp4 |
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| 115 | .equ ROStmp5, &OStmp5 |
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| 116 | .equ ROStmp6, &OStmp6 |
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| 117 | .equ ROStmp7, &OStmp7 |
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| 118 | |
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| 119 | .equ ROStmp8, &OStmp8 |
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| 120 | .equ ROStmp9, &OStmp9 |
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| 121 | .equ ROStmp10, &OStmp10 |
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| 122 | .equ ROStmp11, &OStmp11 |
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| 123 | |
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| 124 | .global ROStmp0, ROStmp1, ROStmp2, ROStmp3 |
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| 125 | .global ROStmp4, ROStmp5, ROStmp6, ROStmp7 |
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| 126 | .global ROStmp8, ROStmp9, ROStmp10, ROStmp11 |
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| 127 | |
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| 128 | ; |
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| 129 | ; Assigning Names to Statics/Permanent Registers. |
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| 130 | ; |
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| 131 | |
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| 132 | .reg OSsta0, gr80 ; Spill Address Register |
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| 133 | .reg OSsta1, gr81 ; Fill Address Register |
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| 134 | .reg OSsta2, gr82 ; Signal Address Register |
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| 135 | .reg OSsta3, gr83 ; pcb Register |
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| 136 | |
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| 137 | .reg OSsta4, gr84 ; |
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| 138 | .reg OSsta5, gr85 ; |
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| 139 | .reg OSsta6, gr86 ; |
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| 140 | .reg OSsta7, gr87 ; |
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| 141 | |
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| 142 | .reg OSsta8, gr88 ; |
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| 143 | .reg OSsta9, gr89 ; |
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| 144 | .reg OSsta10, gr90 ; |
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| 145 | .reg OSsta11, gr91 ; |
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| 146 | |
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| 147 | .reg OSsta12, gr92 ; |
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| 148 | .reg OSsta13, gr93 ; |
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| 149 | .reg OSsta14, gr94 ; |
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| 150 | .reg OSsta15, gr95 ; |
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| 151 | |
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| 152 | ; |
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| 153 | ; Round 2 of Name Assignments |
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| 154 | ; |
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| 155 | |
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| 156 | ; |
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| 157 | ; Assignment of Specific Use oriented names to statics. |
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| 158 | ; |
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| 159 | .reg SpillAddrReg, gr80 |
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| 160 | .reg FillAddrReg, gr81 |
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| 161 | .reg SignalAddrReg, gr82 |
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| 162 | .reg pcb, gr83 |
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| 163 | |
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| 164 | .reg etx, gr80 |
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| 165 | .reg ety, gr81 |
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| 166 | .reg etz, gr82 |
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| 167 | .reg etc, gr83 |
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| 168 | |
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| 169 | ;* |
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| 170 | |
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| 171 | .reg TimerExt, gr84 |
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| 172 | .reg TimerUtil, gr85 |
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| 173 | |
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| 174 | ;* |
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| 175 | |
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| 176 | .reg LEDReg, gr86 |
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| 177 | .reg ERRReg, gr87 |
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| 178 | |
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| 179 | .reg eta, gr86 |
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| 180 | .reg etb, gr87 |
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| 181 | |
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| 182 | ;* |
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| 183 | |
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| 184 | |
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| 185 | ;* The following registers are used by switching code |
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| 186 | |
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| 187 | .reg et0, gr88 |
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| 188 | .reg et1, gr89 |
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| 189 | .reg et2, gr90 |
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| 190 | .reg et3, gr91 |
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| 191 | |
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| 192 | .reg et4, gr92 |
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| 193 | .reg et5, gr93 |
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| 194 | .reg et6, gr94 |
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| 195 | .reg et7, gr95 |
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| 196 | |
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| 197 | |
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| 198 | ; The floating point trap handlers need a few static registers |
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| 199 | |
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| 200 | .reg FPStat0, gr88 |
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| 201 | .reg FPStat1, gr89 |
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| 202 | .reg FPStat2, gr90 |
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| 203 | .reg FPStat3, gr91 |
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| 204 | |
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| 205 | ; The following registers are used temporarily during diagnostics. |
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| 206 | |
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| 207 | .reg XLINXReg, gr92 |
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| 208 | .reg VMBCReg, gr93 |
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| 209 | .reg UARTReg, gr94 |
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| 210 | .reg ETHERReg, gr95 |
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| 211 | |
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| 212 | ;* |
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| 213 | |
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| 214 | ;;* |
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| 215 | .reg heapptr, gr90 |
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| 216 | .reg ArgvPtr, gr91 |
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| 217 | ;;* |
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| 218 | |
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| 219 | |
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| 220 | |
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| 221 | ; |
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| 222 | ;* Preparing to export Register Names for the Linkers benefit. |
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| 223 | ; |
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| 224 | |
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| 225 | .equ RSpillAddrReg, &SpillAddrReg |
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| 226 | .equ RFillAddrReg, &FillAddrReg |
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| 227 | .equ RSignalAddrReg, &SignalAddrReg |
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| 228 | .equ Rpcb, &pcb |
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| 229 | |
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| 230 | .equ Retx, &etx |
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| 231 | .equ Rety, &ety |
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| 232 | .equ Retz, &etz |
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| 233 | .equ Reta, &eta |
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| 234 | |
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| 235 | .equ Retb, &etb |
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| 236 | .equ Retc, &etc |
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| 237 | .equ RTimerExt, &TimerExt |
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| 238 | .equ RTimerUtil, &TimerUtil |
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| 239 | |
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| 240 | .equ RLEDReg, &LEDReg |
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| 241 | .equ RERRReg, &ERRReg |
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| 242 | |
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| 243 | .equ Ret0, &et0 |
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| 244 | .equ Ret1, &et1 |
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| 245 | .equ Ret2, &et2 |
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| 246 | .equ Ret3, &et3 |
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| 247 | |
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| 248 | .equ RFPStat0, &FPStat0 |
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| 249 | .equ RFPStat1, &FPStat1 |
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| 250 | .equ RFPStat2, &FPStat2 |
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| 251 | .equ RFPStat3, &FPStat3 |
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| 252 | |
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| 253 | .equ Rheapptr, &heapptr |
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| 254 | .equ RHeapPtr, &heapptr |
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| 255 | .equ RArgvPtr, &ArgvPtr |
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| 256 | |
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| 257 | .equ Ret4, &et4 |
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| 258 | .equ Ret5, &et5 |
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| 259 | .equ Ret6, &et6 |
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| 260 | .equ Ret7, &et7 |
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| 261 | |
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| 262 | .equ RXLINXReg, &XLINXReg |
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| 263 | .equ RVMBCReg, &VMBCReg |
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| 264 | .equ RUARTReg, &UARTReg |
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| 265 | .equ RETHERReg, ÐERReg |
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| 266 | |
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| 267 | .global RSpillAddrReg, RFillAddrReg, RSignalAddrReg |
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| 268 | .global Rpcb, Retc |
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| 269 | .global RTimerExt, RTimerUtil, RLEDReg, RERRReg |
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| 270 | .global Ret0, Ret1, Ret2, Ret3, Ret4, Ret5, Ret6, Ret7, Reta, Retb |
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| 271 | .global Retx, Rety, Retz |
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| 272 | .global RFPStat0, RFPStat1, RFPStat2, RFPStat3 |
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| 273 | .global Rheapptr, RHeapPtr, RArgvPtr |
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| 274 | .global RXLINXReg, RVMBCReg, RUARTReg, RETHERReg |
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| 275 | |
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| 276 | ; |
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| 277 | ;************************************************************************* |
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| 278 | ; |
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| 279 | |
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| 280 | |
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| 281 | ; |
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| 282 | ; Rule 3: |
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| 283 | ; Gr96-Gr127 Compiler & Programmer use registers. |
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| 284 | ; 32 Registers for Compiler & Programmer use |
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| 285 | |
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| 286 | ; |
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| 287 | ; 16 Registers for Compiler Use. |
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| 288 | ; |
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| 289 | |
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| 290 | ; |
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| 291 | ; Compiler Temporaries and Function Return Values |
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| 292 | ; |
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| 293 | |
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| 294 | .reg v0, gr96 ; First word of Return Value |
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| 295 | .reg v1, gr97 |
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| 296 | .reg v2, gr98 |
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| 297 | .reg v3, gr99 |
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| 298 | |
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| 299 | .reg v4, gr100 |
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| 300 | .reg v5, gr101 |
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| 301 | .reg v6, gr102 |
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| 302 | .reg v7, gr103 |
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| 303 | |
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| 304 | .reg v8, gr104 |
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| 305 | .reg v9, gr105 |
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| 306 | .reg v10, gr106 |
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| 307 | .reg v11, gr107 |
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| 308 | |
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| 309 | .reg v12, gr108 |
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| 310 | .reg v13, gr109 |
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| 311 | .reg v14, gr110 |
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| 312 | .reg v15, gr111 |
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| 313 | |
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| 314 | .equ Rv0, &v0 |
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| 315 | .equ Rv1, &v1 |
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| 316 | .equ Rv2, &v2 |
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| 317 | .equ Rv3, &v3 |
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| 318 | |
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| 319 | .equ Rv4, &v4 |
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| 320 | .equ Rv5, &v5 |
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| 321 | .equ Rv6, &v6 |
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| 322 | .equ Rv7, &v7 |
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| 323 | |
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| 324 | .equ Rv8, &v8 |
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| 325 | .equ Rv9, &v9 |
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| 326 | .equ Rv10, &v10 |
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| 327 | .equ Rv11, &v11 |
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| 328 | |
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| 329 | .equ Rv12, &v12 |
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| 330 | .equ Rv13, &v13 |
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| 331 | .equ Rv14, &v14 |
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| 332 | .equ Rv15, &v15 |
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| 333 | |
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| 334 | .global Rv0, Rv1, Rv2, Rv3, Rv4, Rv5, Rv6, Rv7, Rv8, Rv9 |
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| 335 | .global Rv10, Rv11, Rv12, Rv13, Rv14, Rv15 |
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| 336 | |
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| 337 | |
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| 338 | ; |
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| 339 | ; User Process Statics Registers |
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| 340 | ; |
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| 341 | |
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| 342 | .reg rp0, gr112 ; Reserved for Programmer, #0 |
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| 343 | .reg rp1, gr113 ; Reserved for Programmer, #1 |
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| 344 | .reg rp2, gr114 ; Reserved for Programmer, #2 |
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| 345 | .reg rp3, gr115 ; Reserved for Programmer, #3 |
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| 346 | |
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| 347 | .equ Rrp0, &rp0 |
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| 348 | .equ Rrp1, &rp1 |
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| 349 | .equ Rrp2, &rp2 |
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| 350 | .equ Rrp3, &rp3 |
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| 351 | |
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| 352 | .global Rrp0, Rrp1, Rrp2, Rrp3 |
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| 353 | |
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| 354 | ; |
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| 355 | ; Compiler Temporaries II |
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| 356 | ; |
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| 357 | |
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| 358 | .reg tv0, gr116 ; |
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| 359 | .reg tv1, gr117 ; |
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| 360 | .reg tv2, gr118 ; |
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| 361 | .reg tv3, gr119 ; |
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| 362 | .reg tv4, gr120 ; |
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| 363 | |
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| 364 | .equ Rtv0, &tv0 ; |
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| 365 | .equ Rtv1, &tv1 ; |
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| 366 | .equ Rtv2, &tv2 ; |
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| 367 | .equ Rtv3, &tv3 ; |
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| 368 | .equ Rtv4, &tv4 ; |
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| 369 | |
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| 370 | .global Rtv0, Rtv1, Rtv2, Rtv3, Rtv4 |
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| 371 | |
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| 372 | ; |
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| 373 | ; Special pointers and registers for handlers and stack operations. |
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| 374 | ; |
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| 375 | |
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| 376 | .reg tav, gr121 ; Temp, Arg for Trap Handlers |
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| 377 | .reg tpc, gr122 ; Temp, Ret PC for Trap Handlers |
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| 378 | .reg lrp, gr123 ; Large Return Pointer |
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| 379 | .reg slp, gr124 ; Static Link Pointer |
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| 380 | |
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| 381 | .reg msp, gr125 ; Memory Stack Pointer |
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| 382 | .reg rab, gr126 ; Register Allocate Bound |
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| 383 | .reg rfb, gr127 ; Register Free Bound |
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| 384 | |
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| 385 | .equ Rtav, &tav |
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| 386 | .equ Rtpc, &tpc |
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| 387 | .equ Rlrp, &lrp |
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| 388 | .equ Rslp, &slp |
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| 389 | .equ Rmsp, &msp |
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| 390 | .equ Rrab, &rab |
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| 391 | .equ Rrfb, &rfb |
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| 392 | |
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| 393 | .global Rtav, Rtpc, Rlrp, Rslp, Rmsp, Rrab, Rrfb |
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