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