| Travis Geiselbrecht | 1d0df69 | 2008-09-01 02:26:09 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2008 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 | |
| 25 | FUNCTION(arm_undefined) |
| 26 | stmfd sp!, { r0-r12, r14 } |
| 27 | sub sp, sp, #12 |
| 28 | mov r0, sp |
| 29 | mrs r1, spsr |
| 30 | stmia r0, { r1, r13-r14 }^ |
| 31 | b arm_undefined_handler |
| 32 | b . |
| 33 | |
| 34 | FUNCTION(arm_syscall) |
| 35 | stmfd sp!, { r0-r12, r14 } |
| 36 | sub sp, sp, #12 |
| 37 | mov r0, sp |
| 38 | mrs r1, spsr |
| 39 | stmia r0, { r1, r13-r14 }^ |
| 40 | b arm_syscall_handler |
| 41 | b . |
| 42 | |
| 43 | FUNCTION(arm_prefetch_abort) |
| 44 | stmfd sp!, { r0-r12, r14 } |
| 45 | sub sp, sp, #12 |
| 46 | mov r0, sp |
| 47 | mrs r1, spsr |
| 48 | stmia r0, { r1, r13-r14 }^ |
| 49 | b arm_prefetch_abort_handler |
| 50 | b . |
| 51 | |
| 52 | FUNCTION(arm_data_abort) |
| 53 | stmfd sp!, { r0-r12, r14 } |
| 54 | sub sp, sp, #12 |
| 55 | mov r0, sp |
| 56 | mrs r1, spsr |
| 57 | stmia r0, { r1, r13-r14 }^ |
| 58 | b arm_data_abort_handler |
| 59 | b . |
| 60 | |
| 61 | FUNCTION(arm_reserved) |
| 62 | b . |
| 63 | |
| 64 | FUNCTION(arm_irq) |
| 65 | /* XXX only deals with interrupting supervisor mode */ |
| 66 | |
| 67 | /* save r4-r6 and use as a temporary place to save while we switch into supervisor mode */ |
| 68 | stmia r13, { r4-r6 } |
| 69 | mov r4, r13 |
| 70 | sub r5, lr, #4 |
| 71 | mrs r6, spsr |
| 72 | |
| 73 | /* move into supervisor mode. irq/fiq disabled */ |
| 74 | msr cpsr_c, #(3<<6 | 0x13) |
| 75 | |
| 76 | /* save the return address */ |
| 77 | stmfd sp!, { r5 } |
| 78 | |
| 79 | /* save C trashed regs, supervisor lr */ |
| 80 | stmfd sp!, { r0-r3, r12, lr } |
| 81 | |
| 82 | /* save spsr */ |
| 83 | stmfd sp!, { r6 } |
| 84 | |
| 85 | /* restore r4-r6 */ |
| 86 | ldmia r4, { r4-r6 } |
| 87 | |
| 88 | /* increment the global critical section count */ |
| 89 | ldr r1, =critical_section_count |
| 90 | ldr r0, [r1] |
| 91 | add r0, r0, #1 |
| 92 | str r0, [r1] |
| 93 | |
| 94 | /* call into higher level code */ |
| 95 | mov r0, sp /* iframe */ |
| 96 | bl platform_irq |
| 97 | |
| 98 | /* reschedule if the handler returns nonzero */ |
| 99 | cmp r0, #0 |
| 100 | blne thread_preempt |
| 101 | |
| 102 | /* decrement the global critical section count */ |
| 103 | ldr r1, =critical_section_count |
| 104 | ldr r0, [r1] |
| 105 | sub r0, r0, #1 |
| 106 | str r0, [r1] |
| 107 | |
| 108 | /* restore spsr */ |
| 109 | ldmfd sp!, { r0 } |
| Travis Geiselbrecht | 3db8380 | 2009-01-16 20:10:29 -0800 | [diff] [blame] | 110 | msr spsr_cxsf, r0 |
| Travis Geiselbrecht | 1d0df69 | 2008-09-01 02:26:09 -0700 | [diff] [blame] | 111 | |
| 112 | /* restore back to where we came from */ |
| 113 | ldmfd sp!, { r0-r3, r12, lr, pc }^ |
| 114 | |
| 115 | .bss |
| 116 | .align 2 |
| 117 | .global irq_save_spot |
| 118 | irq_save_spot: |
| 119 | .word 0 /* r4 */ |
| 120 | .word 0 /* r5 */ |
| 121 | .word 0 /* r6 */ |
| 122 | |
| 123 | .text |
| 124 | FUNCTION(arm_fiq) |
| 125 | sub lr, lr, #4 |
| 126 | stmfd sp!, { r0-r3, r12, lr } |
| 127 | |
| 128 | bl platform_fiq |
| 129 | |
| 130 | ldmfd sp!, { r0-r3, r12, pc }^ |
| 131 | |
| 132 | .ltorg |