2021-12-19 19:05:40 +00:00
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#include "asm/constants/gba_constants.inc"
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2017-12-11 06:41:46 +00:00
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.syntax unified
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.global Start
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.text
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.arm
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Start: @ 8000000
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b Init
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2021-12-19 19:05:40 +00:00
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#include "rom_header.inc"
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2017-12-11 06:41:46 +00:00
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.arm
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.align 2, 0
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.global Init
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Init: @ 80000C0
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mov r0, PSR_IRQ_MODE
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msr cpsr_cf, r0
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ldr sp, sp_irq
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mov r0, PSR_SYS_MODE
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msr cpsr_cf, r0
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ldr sp, sp_sys
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ldr r1, =INTR_VECTOR
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adr r0, IntrMain
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str r0, [r1]
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ldr r1, =AgbMain
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mov lr, pc
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bx r1
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b Init
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.align 2, 0
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sp_sys: .word IWRAM_END - 0x100
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sp_irq: .word IWRAM_END - 0x60
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.pool
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.arm
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.align 2, 0
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.global IntrMain
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IntrMain: @ 8000104
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mov r3, REG_BASE
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add r3, r3, 0x200
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ldr r2, [r3, OFFSET_REG_IE - 0x200]
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ldrh r1, [r3, OFFSET_REG_IME - 0x200]
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mrs r0, spsr
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stmdb sp!, {r0-r3,lr}
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mov r0, 1
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strh r0, [r3, OFFSET_REG_IME - 0x200]
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and r1, r2, r2, lsr 16
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mov r12, 0
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ands r0, r1, INTR_FLAG_SERIAL | INTR_FLAG_TIMER3
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bne IntrMain_FoundIntr
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add r12, r12, 0x4
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ands r0, r1, INTR_FLAG_VBLANK
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bne IntrMain_FoundIntr
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add r12, r12, 0x4
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ands r0, r1, INTR_FLAG_VCOUNT
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bne IntrMain_FoundIntr
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add r12, r12, 0x4
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ands r0, r1, INTR_FLAG_TIMER2
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bne IntrMain_FoundIntr
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add r12, r12, 0x4
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ands r0, r1, INTR_FLAG_TIMER3
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bne IntrMain_FoundIntr
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add r12, r12, 0x4
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ands r0, r1, INTR_FLAG_GAMEPAK
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strbne r0, [r3, OFFSET_REG_SOUNDCNT_X - 0x200]
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IntrMain_Loop:
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bne IntrMain_Loop
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IntrMain_FoundIntr:
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strh r0, [r3, OFFSET_REG_IF - 0x200]
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mov r1, INTR_FLAG_GAMEPAK | INTR_FLAG_SERIAL
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bic r2, r2, r0
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and r1, r1, r2
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strh r1, [r3, OFFSET_REG_IE - 0x200]
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mrs r3, cpsr
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bic r3, r3, PSR_I_BIT | PSR_F_BIT | PSR_MODE_MASK
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orr r3, r3, PSR_SYS_MODE
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msr cpsr_cf, r3
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ldr r1, =gIntrTable
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add r1, r1, r12
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ldr r0, [r1]
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stmdb sp!, {lr}
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adr lr, IntrMain_RetAddr
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bx r0
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IntrMain_RetAddr:
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ldmia sp!, {lr}
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mrs r3, cpsr
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bic r3, r3, PSR_I_BIT | PSR_F_BIT | PSR_MODE_MASK
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orr r3, r3, PSR_I_BIT | PSR_IRQ_MODE
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msr cpsr_cf, r3
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ldmia sp!, {r0-r3,lr}
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strh r2, [r3, OFFSET_REG_IE - 0x200]
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strh r1, [r3, OFFSET_REG_IME - 0x200]
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msr spsr_cf, r0
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bx lr
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.pool
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.align 2, 0 @ Don't pad with nop.
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