| rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (c) 2015 Travis Geiselbrecht |
| 3 | * |
| 4 | * Permission is hereby granted, free of charge, to any person obtaining |
| 5 | * a copy of this software and associated documentation files |
| 6 | * (the "Software"), to deal in the Software without restriction, |
| 7 | * including without limitation the rights to use, copy, modify, merge, |
| 8 | * publish, distribute, sublicense, and/or sell copies of the Software, |
| 9 | * and to permit persons to whom the Software is furnished to do so, |
| 10 | * subject to the following conditions: |
| 11 | * |
| 12 | * The above copyright notice and this permission notice shall be |
| 13 | * included in all copies or substantial portions of the Software. |
| 14 | * |
| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| 16 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| 17 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
| 18 | * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY |
| 19 | * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
| 20 | * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
| 21 | * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| 22 | */ |
| 23 | #include <asm.h> |
| 24 | #include <arch/mips.h> |
| 25 | |
| 26 | .section ".text.vectab" |
| 27 | FUNCTION(vectab) |
| 28 | .org 0 |
| 29 | _tlb_refill: |
| 30 | b . |
| 31 | |
| 32 | .macro iframe_save |
| 33 | .set push |
| 34 | .set noat |
| 35 | addiu $sp, -88 |
| 36 | |
| 37 | /* save all the non temporary registers */ |
| 38 | sw $at, 0($sp) |
| 39 | sw $v0, 4($sp) |
| 40 | sw $v1, 8($sp) |
| 41 | sw $a0, 12($sp) |
| 42 | sw $a1, 16($sp) |
| 43 | sw $a2, 20($sp) |
| 44 | sw $a3, 24($sp) |
| 45 | sw $t0, 28($sp) |
| 46 | sw $t1, 32($sp) |
| 47 | sw $t2, 36($sp) |
| 48 | sw $t3, 40($sp) |
| 49 | sw $t4, 44($sp) |
| 50 | sw $t5, 48($sp) |
| 51 | sw $t6, 52($sp) |
| 52 | sw $t7, 56($sp) |
| 53 | sw $t8, 60($sp) |
| 54 | sw $t9, 64($sp) |
| 55 | sw $gp, 68($sp) |
| 56 | sw $ra, 72($sp) |
| 57 | |
| 58 | /* save the control registers */ |
| 59 | mfc0 $at, $12 /* status */ |
| 60 | sw $at, 76($sp) |
| 61 | mfc0 $at, $13 /* cause */ |
| 62 | sw $at, 80($sp) |
| 63 | mfc0 $at, $14 /* epc */ |
| 64 | sw $at, 84($sp) |
| 65 | |
| 66 | .set pop |
| 67 | .endm |
| 68 | |
| 69 | .macro iframe_restore |
| 70 | .set push |
| 71 | .set noat |
| 72 | |
| 73 | /* restore the temporary registers */ |
| 74 | lw $at, 0($sp) |
| 75 | lw $v0, 4($sp) |
| 76 | lw $v1, 8($sp) |
| 77 | lw $a0, 12($sp) |
| 78 | lw $a1, 16($sp) |
| 79 | lw $a2, 20($sp) |
| 80 | lw $a3, 24($sp) |
| 81 | lw $t0, 28($sp) |
| 82 | lw $t1, 32($sp) |
| 83 | lw $t2, 36($sp) |
| 84 | lw $t3, 40($sp) |
| 85 | lw $t4, 44($sp) |
| 86 | lw $t5, 48($sp) |
| 87 | lw $t6, 52($sp) |
| 88 | lw $t7, 56($sp) |
| 89 | lw $t8, 60($sp) |
| 90 | lw $t9, 64($sp) |
| 91 | lw $gp, 68($sp) |
| 92 | lw $ra, 72($sp) |
| 93 | |
| 94 | /* restore the control registers */ |
| 95 | lw $k0, 76($sp) |
| 96 | mtc0 $k0, $12 /* status */ |
| 97 | lw $k0, 80($sp) |
| 98 | mtc0 $k0, $13 /* cause */ |
| 99 | lw $k0, 84($sp) |
| 100 | mtc0 $k0, $14 /* epc */ |
| 101 | |
| 102 | addiu $sp, 88 |
| 103 | .set pop |
| 104 | .endm |
| 105 | |
| 106 | /* compatibility mode irq/syscall/general exception */ |
| 107 | .org 0x180 |
| 108 | _irq: |
| 109 | la $k0, mips_gen_exception |
| 110 | li $k1, 0 |
| 111 | b shared_irq_save_return |
| 112 | |
| 113 | /* vectored base */ |
| 114 | .macro vectored_irq, num |
| 115 | .org 0x200 + VECTORED_OFFSET_SHIFT * \num |
| 116 | _vectored_irq\num: |
| 117 | la $k0, mips_irq |
| 118 | li $k1, \num |
| 119 | b shared_irq_save_return |
| 120 | b . |
| 121 | .endm |
| 122 | |
| 123 | vectored_irq 0 |
| 124 | vectored_irq 1 |
| 125 | vectored_irq 2 |
| 126 | vectored_irq 3 |
| 127 | vectored_irq 4 |
| 128 | vectored_irq 5 |
| 129 | vectored_irq 6 |
| 130 | vectored_irq 7 |
| 131 | vectored_irq 8 |
| 132 | vectored_irq 9 |
| 133 | |
| 134 | /* branched to from above, k0 holds address to call, k1 holds arg to function */ |
| 135 | shared_irq_save_return: |
| 136 | iframe_save |
| 137 | |
| 138 | move $a0, $sp |
| 139 | move $a1, $k1 |
| 140 | jal $k0 |
| 141 | |
| 142 | iframe_restore |
| 143 | |
| 144 | eret |
| 145 | |