| /* |
| * Copyright (c) 2008 Travis Geiselbrecht |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining |
| * a copy of this software and associated documentation files |
| * (the "Software"), to deal in the Software without restriction, |
| * including without limitation the rights to use, copy, modify, merge, |
| * publish, distribute, sublicense, and/or sell copies of the Software, |
| * and to permit persons to whom the Software is furnished to do so, |
| * subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be |
| * included in all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
| * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY |
| * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
| * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
| * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| */ |
| #include <asm.h> |
| |
| FUNCTION(arm_undefined) |
| stmfd sp!, { r0-r12, r14 } |
| sub sp, sp, #12 |
| mov r0, sp |
| mrs r1, spsr |
| stmia r0, { r1, r13-r14 }^ |
| b arm_undefined_handler |
| b . |
| |
| FUNCTION(arm_syscall) |
| stmfd sp!, { r0-r12, r14 } |
| sub sp, sp, #12 |
| mov r0, sp |
| mrs r1, spsr |
| stmia r0, { r1, r13-r14 }^ |
| b arm_syscall_handler |
| b . |
| |
| FUNCTION(arm_prefetch_abort) |
| stmfd sp!, { r0-r12, r14 } |
| sub sp, sp, #12 |
| mov r0, sp |
| mrs r1, spsr |
| stmia r0, { r1, r13-r14 }^ |
| b arm_prefetch_abort_handler |
| b . |
| |
| FUNCTION(arm_data_abort) |
| stmfd sp!, { r0-r12, r14 } |
| sub sp, sp, #12 |
| mov r0, sp |
| mrs r1, spsr |
| stmia r0, { r1, r13-r14 }^ |
| b arm_data_abort_handler |
| b . |
| |
| FUNCTION(arm_reserved) |
| b . |
| |
| FUNCTION(arm_irq) |
| /* XXX only deals with interrupting supervisor mode */ |
| |
| /* save r4-r6 and use as a temporary place to save while we switch into supervisor mode */ |
| stmia r13, { r4-r6 } |
| mov r4, r13 |
| sub r5, lr, #4 |
| mrs r6, spsr |
| |
| /* move into supervisor mode. irq/fiq disabled */ |
| msr cpsr_c, #(3<<6 | 0x13) |
| |
| /* save the return address */ |
| stmfd sp!, { r5 } |
| |
| /* save C trashed regs, supervisor lr */ |
| stmfd sp!, { r0-r3, r12, lr } |
| |
| /* save spsr */ |
| stmfd sp!, { r6 } |
| |
| /* restore r4-r6 */ |
| ldmia r4, { r4-r6 } |
| |
| /* increment the global critical section count */ |
| ldr r1, =critical_section_count |
| ldr r0, [r1] |
| add r0, r0, #1 |
| str r0, [r1] |
| |
| /* call into higher level code */ |
| mov r0, sp /* iframe */ |
| bl platform_irq |
| |
| /* reschedule if the handler returns nonzero */ |
| cmp r0, #0 |
| blne thread_preempt |
| |
| /* decrement the global critical section count */ |
| ldr r1, =critical_section_count |
| ldr r0, [r1] |
| sub r0, r0, #1 |
| str r0, [r1] |
| |
| /* restore spsr */ |
| ldmfd sp!, { r0 } |
| msr spsr_cxsf, r0 |
| |
| /* restore back to where we came from */ |
| ldmfd sp!, { r0-r3, r12, lr, pc }^ |
| |
| .bss |
| .align 2 |
| .global irq_save_spot |
| irq_save_spot: |
| .word 0 /* r4 */ |
| .word 0 /* r5 */ |
| .word 0 /* r6 */ |
| |
| .text |
| FUNCTION(arm_fiq) |
| sub lr, lr, #4 |
| stmfd sp!, { r0-r3, r12, lr } |
| |
| bl platform_fiq |
| |
| ldmfd sp!, { r0-r3, r12, pc }^ |
| |
| .ltorg |