114 lines
2.7 KiB
ArmAsm
114 lines
2.7 KiB
ArmAsm
@ vim: set ft=armv5:
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.section ".entry", "awx", %progbits
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.global VECTORS
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VECTORS:
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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:
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.4byte _start
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undefined_handler:
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.4byte hang
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swi_handler:
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.4byte hang
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prefetch_handler:
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.4byte hang
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data_handler:
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.4byte hang
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unused_handler:
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.4byte hang
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irq_handler:
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.4byte hang
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fiq_handler:
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.4byte hang
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.global _start
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_start:
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@ copy over exception vectors
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mov r0, #0x8000
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mov r1, #0
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ldmia r0!, {r2-r9}
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stmia r1!, {r2-r9}
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ldmia r0!, {r2-r9}
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stmia r1!, {r2-r9}
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@ IRQ mode
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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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@ FIQ mode
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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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@ SVC mode
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mov r0, #0xd3
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msr cpsr_c, r0
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mov sp, #0x08000000
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mov r0, #0
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mcr p15, 0, r0, c3, c0, 0 @ disable write buffer
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mcr p15, 0, r0, c2, c0, 0 @ disable icache & dcache
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mcr p15, 0, r0, c2, c0, 1
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@ disable stuff
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mrc p15, 0, r0, c1, c0, 0
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ldr r1, =((1<<12)|(1<<2)|(1<<0)) @ icache/dcache/mpu enable bits
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bic r0, r1
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mcr p15, 0, r0, c1, c0, 0
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@ clear bss
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ldr r0, =__bss_start
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ldr r1, =__bss_end
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mov r2, #0
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mov r3, #0
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zeroloop:
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strd r2, r3, [r0], #8
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cmp r0, r1
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bne zeroloop
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bl main
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@ fallthru
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hang:
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b hang
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.pool
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/*.section ".text.utils", "ax", %progbits
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.global PUT32
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PUT32:
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str r1,[r0]
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bx lr
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.global GET32
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GET32:
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ldr r0,[r0]
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;@ bx lr
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.global dummy
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dummy:
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bx lr*/
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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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