1 /* 2 * Interrupt and TLB miss handling support. 3 * 4 * Copyright (C) 2015, 2016 Paul Boddie <paul@boddie.org.uk> 5 * 6 * This program is free software: you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation, either version 3 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program. If not, see <http://www.gnu.org/licenses/>. 18 */ 19 20 .text 21 .extern tlb_handler 22 .extern interrupt_handler 23 .globl _tlb_entry 24 .globl _irq_entry 25 .globl _end_entries 26 .set noreorder 27 28 _tlb_entry: 29 /* Save the status. */ 30 31 mfc0 $k0, $12 /* CP0_STATUS */ 32 nop 33 sw $k0, -120($sp) 34 35 /* Mask interrupts. */ 36 37 li $k1, 0xffff03ff 38 and $k1, $k0, $k1 39 mtc0 $k1, $12 40 41 /* Save registers that the assembler wants to trash. */ 42 43 sw $t9, -100($sp) 44 sw $gp, -104($sp) 45 sw $ra, -112($sp) 46 47 lui $gp, %hi(_GLOBAL_OFFSET_TABLE_) 48 ori $gp, $gp, %lo(_GLOBAL_OFFSET_TABLE_) 49 la $k0, tlb_handler 50 jr $k0 51 nop 52 53 _irq_entry: 54 /* Save the status. */ 55 56 mfc0 $k0, $12 /* CP0_STATUS */ 57 nop 58 sw $k0, -120($sp) 59 60 /* Mask interrupts. */ 61 62 li $k1, 0xffff03ff 63 and $k1, $k0, $k1 64 mtc0 $k1, $12 65 66 /* Save registers that the assembler wants to trash. */ 67 68 sw $t9, -100($sp) 69 sw $gp, -104($sp) 70 sw $ra, -112($sp) 71 72 lui $gp, %hi(_GLOBAL_OFFSET_TABLE_) 73 ori $gp, $gp, %lo(_GLOBAL_OFFSET_TABLE_) 74 la $k0, interrupt_handler 75 jr $k0 76 nop 77 78 _end_entries: 79 80 .set reorder