129 lines
2.7 KiB
ArmAsm
129 lines
2.7 KiB
ArmAsm
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.include "constants/gba_constants.inc"
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.syntax unified
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.arm
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.align 2, 0
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.global Init
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Init: @ 8000204
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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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.if MODERN
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mov r0, #255 @ RESET_ALL
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svc #1 << 16
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.endif @ MODERN
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ldr r1, =AgbMain + 1
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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 - 0x1c0
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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: @ 8000248
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mov r3, #REG_BASE
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add r3, r3, #OFFSET_REG_IE
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ldr r2, [r3]
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ldrh r1, [r3, #OFFSET_REG_IME - 0x200]
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mrs r0, spsr
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stmfd sp!, {r0-r3,lr}
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mov r0, #0
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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_VCOUNT
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bne IntrMain_FoundIntr
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add r12, r12, 0x4
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mov r0, 0x1
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strh r0, [r3, #OFFSET_REG_IME - 0x200]
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ands r0, r1, #INTR_FLAG_SERIAL
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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_HBLANK
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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_TIMER0
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bne IntrMain_FoundIntr
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add r12, r12, 0x4
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ands r0, r1, #INTR_FLAG_TIMER1
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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_DMA0
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bne IntrMain_FoundIntr
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add r12, r12, 0x4
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ands r0, r1, #INTR_FLAG_DMA1
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bne IntrMain_FoundIntr
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add r12, r12, 0x4
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ands r0, r1, #INTR_FLAG_DMA2
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bne IntrMain_FoundIntr
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add r12, r12, 0x4
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ands r0, r1, #INTR_FLAG_DMA3
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bne IntrMain_FoundIntr
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add r12, r12, 0x4
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ands r0, r1, #INTR_FLAG_KEYPAD
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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, #REG_SOUNDCNT_X - REG_IE]
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bne . @ spin
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IntrMain_FoundIntr:
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strh r0, [r3, #OFFSET_REG_IF - 0x200]
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bic r2, r2, r0
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ldr r0, =gSTWIStatus
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ldr r0, [r0]
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ldrb r0, [r0, 0xA]
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mov r1, 0x8
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lsl r0, r1, r0
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orr r0, r0, #INTR_FLAG_GAMEPAK
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orr r1, r0, #INTR_FLAG_SERIAL | INTR_FLAG_TIMER3 | INTR_FLAG_VCOUNT | INTR_FLAG_HBLANK
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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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stmfd 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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ldmfd 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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