diff options
Diffstat (limited to 'asm/start.s')
| -rwxr-xr-x | asm/start.s | 198 |
1 files changed, 99 insertions, 99 deletions
diff --git a/asm/start.s b/asm/start.s index ec036b0..ab124f4 100755 --- a/asm/start.s +++ b/asm/start.s @@ -1,112 +1,112 @@ - .include "constants/gba_constants.inc" + .include "constants/gba_constants.inc" - .syntax unified - .arm + .syntax unified + .arm Start: @ 8000000 - b Init + b Init .incbin "baserom.gba", 0x4, 0xBC - .arm - .align 2 + .arm + .align 2 Init: @ 80000C0 - mov r0, #0x12 - msr cpsr_cf, r0 - ldr sp, sp_irq - mov r0, #0x1F - msr cpsr_cf, r0 - ldr sp, sp_sys - ldr r1, =INTR_VECTOR - adr r0, IntrMain - str r0, [r1] - ldr r1, =0x800095C + 1 - mov lr, pc - bx r1 - b Init + mov r0, #0x12 + msr cpsr_cf, r0 + ldr sp, sp_irq + mov r0, #0x1F + msr cpsr_cf, r0 + ldr sp, sp_sys + ldr r1, =INTR_VECTOR + adr r0, IntrMain + str r0, [r1] + ldr r1, =0x800095C + 1 + mov lr, pc + bx r1 + b Init sp_sys: .4byte IWRAM_END - 0x100 sp_irq: .4byte IWRAM_END - 0x60 - .pool + .pool - .global IntrMain + .global IntrMain IntrMain: @ 8000104 - mov r3, REG_BASE - add r3, r3, OFFSET_REG_IE - ldr r2, [r3] - ldrh r1, [r3, OFFSET_REG_IME - OFFSET_REG_IE] - mrs r0, spsr - stmdb sp!, {r0-r3,lr} - mov r0, 1 - strh r0, [r3, OFFSET_REG_IME - OFFSET_REG_IE] - and r1, r2, r2, lsr 16 - mov r12, 0 - ands r0, r1, INTR_FLAG_SERIAL - bne IntrMain_FoundIntr - add r12, r12, 4 - ands r0, r1, INTR_FLAG_TIMER3 - bne IntrMain_FoundIntr - add r12, r12, 4 - ands r0, r1, INTR_FLAG_VBLANK - bne IntrMain_FoundIntr - add r12, r12, 4 - ands r0, r1, INTR_FLAG_HBLANK - bne IntrMain_FoundIntr - add r12, r12, 4 - ands r0, r1, INTR_FLAG_VCOUNT - bne IntrMain_FoundIntr - add r12, r12, 4 - ands r0, r1, INTR_FLAG_TIMER0 - bne IntrMain_FoundIntr - add r12, r12, 4 - ands r0, r1, INTR_FLAG_TIMER1 - bne IntrMain_FoundIntr - add r12, r12, 4 - ands r0, r1, INTR_FLAG_TIMER2 - bne IntrMain_FoundIntr - add r12, r12, 4 - ands r0, r1, INTR_FLAG_DMA0 - bne IntrMain_FoundIntr - add r12, r12, 4 - ands r0, r1, INTR_FLAG_DMA1 - bne IntrMain_FoundIntr - add r12, r12, 4 - ands r0, r1, INTR_FLAG_DMA2 - bne IntrMain_FoundIntr - add r12, r12, 4 - ands r0, r1, INTR_FLAG_DMA3 - bne IntrMain_FoundIntr - add r12, r12, 4 - ands r0, r1, INTR_FLAG_KEYPAD - bne IntrMain_FoundIntr - add r12, r12, 4 - ands r0, r1, INTR_FLAG_GAMEPAK - strbne r0, [r3, OFFSET_REG_SOUNDCNT_X - OFFSET_REG_IE] - bne . @ spin + mov r3, REG_BASE + add r3, r3, OFFSET_REG_IE + ldr r2, [r3] + ldrh r1, [r3, OFFSET_REG_IME - OFFSET_REG_IE] + mrs r0, spsr + stmdb sp!, {r0-r3,lr} + mov r0, 1 + strh r0, [r3, OFFSET_REG_IME - OFFSET_REG_IE] + and r1, r2, r2, lsr 16 + mov r12, 0 + ands r0, r1, INTR_FLAG_SERIAL + bne IntrMain_FoundIntr + add r12, r12, 4 + ands r0, r1, INTR_FLAG_TIMER3 + bne IntrMain_FoundIntr + add r12, r12, 4 + ands r0, r1, INTR_FLAG_VBLANK + bne IntrMain_FoundIntr + add r12, r12, 4 + ands r0, r1, INTR_FLAG_HBLANK + bne IntrMain_FoundIntr + add r12, r12, 4 + ands r0, r1, INTR_FLAG_VCOUNT + bne IntrMain_FoundIntr + add r12, r12, 4 + ands r0, r1, INTR_FLAG_TIMER0 + bne IntrMain_FoundIntr + add r12, r12, 4 + ands r0, r1, INTR_FLAG_TIMER1 + bne IntrMain_FoundIntr + add r12, r12, 4 + ands r0, r1, INTR_FLAG_TIMER2 + bne IntrMain_FoundIntr + add r12, r12, 4 + ands r0, r1, INTR_FLAG_DMA0 + bne IntrMain_FoundIntr + add r12, r12, 4 + ands r0, r1, INTR_FLAG_DMA1 + bne IntrMain_FoundIntr + add r12, r12, 4 + ands r0, r1, INTR_FLAG_DMA2 + bne IntrMain_FoundIntr + add r12, r12, 4 + ands r0, r1, INTR_FLAG_DMA3 + bne IntrMain_FoundIntr + add r12, r12, 4 + ands r0, r1, INTR_FLAG_KEYPAD + bne IntrMain_FoundIntr + add r12, r12, 4 + ands r0, r1, INTR_FLAG_GAMEPAK + strbne r0, [r3, OFFSET_REG_SOUNDCNT_X - OFFSET_REG_IE] + bne . @ spin IntrMain_FoundIntr: @ 80001D4 - strh r0, [r3, OFFSET_REG_IF - OFFSET_REG_IE] - mov r1, INTR_FLAG_GAMEPAK | INTR_FLAG_TIMER3 | INTR_FLAG_SERIAL - bic r2, r2, r0 - and r1, r1, r2 - strh r1, [r3] - mrs r3, cpsr - bic r3, r3, PSR_I_BIT | PSR_F_BIT | PSR_MODE_MASK - orr r3, r3, PSR_SYS_MODE - msr cpsr_cf, r3 - ldr r1, =gIntrTable - add r1, r1, r12 - ldr r0, [r1] - stmdb sp!, {lr} - adr lr, IntrMain_RetAddr - bx r0 + strh r0, [r3, OFFSET_REG_IF - OFFSET_REG_IE] + mov r1, INTR_FLAG_GAMEPAK | INTR_FLAG_TIMER3 | INTR_FLAG_SERIAL + bic r2, r2, r0 + and r1, r1, r2 + strh r1, [r3] + mrs r3, cpsr + bic r3, r3, PSR_I_BIT | PSR_F_BIT | PSR_MODE_MASK + orr r3, r3, PSR_SYS_MODE + msr cpsr_cf, r3 + ldr r1, =gIntrTable + add r1, r1, r12 + ldr r0, [r1] + stmdb sp!, {lr} + adr lr, IntrMain_RetAddr + bx r0 IntrMain_RetAddr: @ 8000210 - ldmfd sp!, {lr} - mrs r3, cpsr - bic r3, r3, PSR_I_BIT | PSR_F_BIT | PSR_MODE_MASK - orr r3, r3, PSR_I_BIT | PSR_IRQ_MODE - msr cpsr_cf, r3 - ldmfd sp!, {r0-r3,lr} - strh r2, [r3] - strh r1, [r3, OFFSET_REG_IME - OFFSET_REG_IE] - msr spsr_cf, r0 - bx lr - .pool + ldmfd sp!, {lr} + mrs r3, cpsr + bic r3, r3, PSR_I_BIT | PSR_F_BIT | PSR_MODE_MASK + orr r3, r3, PSR_I_BIT | PSR_IRQ_MODE + msr cpsr_cf, r3 + ldmfd sp!, {r0-r3,lr} + strh r2, [r3] + strh r1, [r3, OFFSET_REG_IME - OFFSET_REG_IE] + msr spsr_cf, r0 + bx lr + .pool |