116 lines
3.1 KiB
ArmAsm
116 lines
3.1 KiB
ArmAsm
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;@-------------------------------------------------------------------------
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;@-------------------------------------------------------------------------
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.globl _start
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_start:
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ldr pc,reset_handler
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ldr pc,undefined_handler
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ldr pc,swi_handler
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ldr pc,prefetch_handler
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ldr pc,data_handler
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ldr pc,unused_handler
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ldr pc,irq_handler
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ldr pc,fiq_handler
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reset_handler: .word reset
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undefined_handler: .word hang
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swi_handler: .word hang
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prefetch_handler: .word hang
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data_handler: .word hang
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unused_handler: .word hang
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irq_handler: .word hang
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fiq_handler: .word irq
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reset:
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mov r0,#0x8000
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mov r1,#0x0000
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ldmia r0!,{r2,r3,r4,r5,r6,r7,r8,r9}
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stmia r1!,{r2,r3,r4,r5,r6,r7,r8,r9}
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ldmia r0!,{r2,r3,r4,r5,r6,r7,r8,r9}
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stmia r1!,{r2,r3,r4,r5,r6,r7,r8,r9}
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;@ (PSR_IRQ_MODE|PSR_FIQ_DIS|PSR_IRQ_DIS)
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mov r0,#0xD2
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msr cpsr_c,r0
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mov sp,#0x8000
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;@ (PSR_FIQ_MODE|PSR_FIQ_DIS|PSR_IRQ_DIS)
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mov r0,#0xD1
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msr cpsr_c,r0
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mov sp,#0x4000
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;@ (PSR_SVC_MODE|PSR_FIQ_DIS|PSR_IRQ_DIS)
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mov r0,#0xD3
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msr cpsr_c,r0
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mov sp,#0x8000000
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;@ SVC MODE, IRQ ENABLED, FIQ DIS
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;@mov r0,#0x53
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;@msr cpsr_c, r0
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bl notmain
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hang: b hang
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.globl PUT32
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PUT32:
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str r1,[r0]
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bx lr
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.globl PUT16
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PUT16:
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strh r1,[r0]
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bx lr
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.globl PUT8
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PUT8:
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strb r1,[r0]
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bx lr
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.globl GET32
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GET32:
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ldr r0,[r0]
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bx lr
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.globl GETPC
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GETPC:
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mov r0,lr
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bx lr
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.globl BRANCHTO
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BRANCHTO:
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bx r0
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.globl dummy
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dummy:
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bx lr
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.globl enable_irq
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enable_irq:
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mrs r0,cpsr
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bic r0,r0,#0x40
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msr cpsr_c,r0
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bx lr
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irq:
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push {r0,r1,r2,r3,r4,r5,r6,r7,lr}
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bl c_irq_handler
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pop {r0,r1,r2,r3,r4,r5,r6,r7,lr}
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subs pc,lr,#4
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;@-------------------------------------------------------------------------
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;@-------------------------------------------------------------------------
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;@-------------------------------------------------------------------------
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;@
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;@ Copyright (c) 2012 David Welch dwelch@dwelch.com
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;@
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;@ 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:
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;@
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;@ The above copyright notice and this permission notice shall be 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, 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.
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;@
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;@-------------------------------------------------------------------------
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