82 lines
1.7 KiB
ArmAsm
82 lines
1.7 KiB
ArmAsm
.global _start
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.syntax divided
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.thumb
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.section .isr_vector
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isrVectors:
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.word 0x20005000
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.word _start+1
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.word vecNMI+1
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.word vecHardfault+1
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.word vecMemMan+1
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.word 0
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.word 0
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.word 0
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/* These is the stage 2 entry point */
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.word stage2+1
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.section .entryVec
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b _start
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.section .text
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.thumb
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_start: /* stage 1 */
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ldr r0, =0xe0002000
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movs r1, #3
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movs r3, #0x05
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movs r2, #0x20
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stm r0!, {r1, r2, r3}
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sinfl: b sinfl
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stage2:
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/* Update the FPB */
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ldr r0, =0xe0002000
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movs r1, #3
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movs r3, #0x05
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movs r2, #0x20
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stm r0!, {r1, r2, r3}
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/* Set stack pointer */
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ldr r0, =isrVectors
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ldr r0, [r0]
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mov sp, r0
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cpsie if
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/* Configure VTOR */
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ldr r0, =0xe000ED08
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ldr r1, =isrVectors
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str r1, [r0]
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ldr r0, =_bss_end
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ldr r1, =_bss_start
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mov r3, #0
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clrloop:strd r3, r3, [r1]
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add r1, r1, #8
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cmp r1, r0
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bne clrloop
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bl main
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infloop:
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b infloop
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.section .text
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vecNMI:
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vecHardfault:
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vecMemMan:
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mrs r0, IPSR
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b alertCrash
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.section .data
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.word 0x12345678
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errVect:
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.word 0x00000000
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.section .bss
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bssFiller:
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.word 0x00000000 |