forked from Mirror/GodMode9
016eac6982
- maps a regular ARM-style exception vector table instead of using the bootrom vector redirection features a ton of bugs because I'm missing something, it actually manages to boot fb3DS v1.2 and BAX fine, but fails to boot itself
48 lines
924 B
ArmAsm
48 lines
924 B
ArmAsm
#include <arm.h>
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.arm
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.align 2
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.section .vector, "ax"
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vectors:
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ldr pc, =XRQ_Reset
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ldr pc, =XRQ_Reset
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ldr pc, =XRQ_Reset
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ldr pc, =XRQ_Reset
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ldr pc, =XRQ_Reset
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b . @ RESERVED
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ldr pc, =XRQ_IRQ
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ldr pc, =XRQ_Reset
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.pool
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.section .text.XRQS, "ax"
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XRQ_Reset:
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mov r0, #0x18000000
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add r1, r0, #(6 << 20)
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mov r2, #0xFFFFFFFF
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1:
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cmp r0, r1
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strne r2, [r0], #4
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bne 1b
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2:
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wfi
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b 2b
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.global XRQ_IRQ
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XRQ_IRQ:
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sub lr, lr, #4 @ Fix return address
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srsfd sp!, #SR_SVC_MODE @ Store IRQ mode LR and SPSR on the SVC stack
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cps #SR_SVC_MODE @ Switch to SVC mode
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push {r0-r4, r12, lr} @ Preserve registers
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and r4, sp, #7 @ Fix SP to be 8byte aligned
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sub sp, sp, r4
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bl GIC_MainHandler
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add sp, sp, r4
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pop {r0-r4, r12, lr}
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rfeia sp! @ Return from exception
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