diff options
Diffstat (limited to 'src/crt0.s')
| -rw-r--r-- | src/crt0.s | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/src/crt0.s b/src/crt0.s new file mode 100644 index 000000000..049392be9 --- /dev/null +++ b/src/crt0.s @@ -0,0 +1,227 @@ + .include "constants/gba_constants.inc" + .include "constants/misc_constants.inc" + .include "constants/version.inc" + + .syntax unified + + .global Start + + .text + + .arm + +Start: @ 8000000 + b Init + + .include "asm/rom_header.inc" + +@ 80000C0 + .word 0 + + .global GPIOPortData +GPIOPortData: @ 80000C4 + .hword 0 + + .global GPIOPortDirection +GPIOPortDirection: @ 80000C6 + .hword 0 + + .global GPIOPortReadEnable +GPIOPortReadEnable: @ 80000C8 + .hword 0 + + .space 6 + +@ 80000D0 + +@ TODO: figure out what this data is + + .ifdef GERMAN + .4byte 0xFFFFFFFF + .4byte 0xFFFFFFFF + .4byte 0xFFFFFFFF + .4byte 0xFFFFFFFF + .4byte 0xFFFFFFFF + .4byte 0xFFFFFFFF + .4byte 0xFFFFFFFF + .4byte 0xFFFFFFFF + .4byte 0xFFFFFFFF + .4byte 0xFFFFFFFF + .4byte 0xFFFFFFFF + .4byte 0xFFFFFFFF + .4byte GAME_VERSION + .4byte GAME_LANGUAGE + .ifdef SAPPHIRE + .ascii "pokemon sapphire version" + .space 8 + .else + .ascii "pokemon ruby version" + .space 12 + .endif + .4byte gMonFrontPicTable + .4byte gMonBackPicTable + .4byte gMonPaletteTable + .4byte gMonShinyPaletteTable + .4byte gMonIconTable + .4byte gMonIconPaletteIndices + .4byte gMonIconPaletteTable + .4byte gSpeciesNames + .4byte gMoveNames + .4byte gDecorations + .4byte 0x1220 + .4byte 0x1340 + .4byte 0x18 + .4byte 0x938 + .4byte 0x3A8C + .4byte 0x46 + .4byte 0x836 + .4byte 0x84C + .4byte 0x182 + .4byte 0xA0A0A07 + .4byte 0xC060C0C + .4byte 0xC121006 + .4byte 0x8010B0F + .4byte 0xC + .4byte 0x890 + .4byte 0x3AC0 + .4byte 0x234 + .4byte 0x238 + .4byte 9 + .4byte 0xA + .4byte 0 + .4byte 8 + .4byte 0x556 + .4byte 0x557 + .4byte 0x312F + .4byte 0x311B + .4byte 0 + .4byte 0 + .4byte 0 + .4byte 0 + .4byte 0 + .4byte 0 + .4byte 0 + .4byte 0 + .4byte 0 + .4byte 0 + .4byte 0 + .4byte 0 + .4byte 0 + .4byte 0 + .4byte 0 + .4byte 0 + .4byte 0 + .4byte 0 + .4byte 0xFFFFFFFF + .endif + + .arm + .align 2, 0 + .global Init +Init: + mov r0, PSR_IRQ_MODE + msr cpsr_cf, r0 + ldr sp, sp_irq + mov r0, PSR_SYS_MODE + msr cpsr_cf, r0 + ldr sp, sp_sys + ldr r1, =INTR_VECTOR + adr r0, IntrMain + str r0, [r1] + ldr r1, =AgbMain + mov lr, pc + bx r1 + b Init + + .align 2, 0 +sp_sys: .word IWRAM_END - 0x1a0 +sp_irq: .word IWRAM_END - 0x60 + + .arm + .align 2, 0 + .global IntrMain +IntrMain: + mov r3, REG_BASE + add r3, r3, 0x200 + ldr r2, [r3, OFFSET_REG_IE - 0x200] + ldrh r1, [r3, OFFSET_REG_IME - 0x200] + mrs r0, spsr + stmdb sp!, {r0-r3,lr} + mov r0, 1 + strh r0, [r3, OFFSET_REG_IME - 0x200] + and r1, r2, r2, lsr 16 + mov r12, 0 + ands r0, r1, INTR_FLAG_SERIAL + bne IntrMain_FoundIntr + add r12, r12, 0x4 + ands r0, r1, INTR_FLAG_TIMER3 + bne IntrMain_FoundIntr + add r12, r12, 0x4 + ands r0, r1, INTR_FLAG_HBLANK + bne IntrMain_FoundIntr + add r12, r12, 0x4 + ands r0, r1, INTR_FLAG_VBLANK + bne IntrMain_FoundIntr + add r12, r12, 0x4 + ands r0, r1, INTR_FLAG_VCOUNT + bne IntrMain_FoundIntr + add r12, r12, 0x4 + ands r0, r1, INTR_FLAG_TIMER0 + bne IntrMain_FoundIntr + add r12, r12, 0x4 + ands r0, r1, INTR_FLAG_TIMER1 + bne IntrMain_FoundIntr + add r12, r12, 0x4 + ands r0, r1, INTR_FLAG_TIMER2 + bne IntrMain_FoundIntr + add r12, r12, 0x4 + ands r0, r1, INTR_FLAG_DMA0 + bne IntrMain_FoundIntr + add r12, r12, 0x4 + ands r0, r1, INTR_FLAG_DMA1 + bne IntrMain_FoundIntr + add r12, r12, 0x4 + ands r0, r1, INTR_FLAG_DMA2 + bne IntrMain_FoundIntr + add r12, r12, 0x4 + ands r0, r1, INTR_FLAG_DMA3 + bne IntrMain_FoundIntr + add r12, r12, 0x4 + ands r0, r1, INTR_FLAG_KEYPAD + bne IntrMain_FoundIntr + add r12, r12, 0x4 + ands r0, r1, INTR_FLAG_GAMEPAK + strbne r0, [r3, OFFSET_REG_SOUNDCNT_X - 0x200] +IntrMain_Loop: + bne IntrMain_Loop +IntrMain_FoundIntr: + strh r0, [r3, OFFSET_REG_IF - 0x200] + mov r1, INTR_FLAG_SERIAL | INTR_FLAG_TIMER3 | INTR_FLAG_HBLANK + bic r2, r2, r0 + and r1, r1, r2 + strh r1, [r3, OFFSET_REG_IE - 0x200] + 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: + ldmia 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 + ldmia sp!, {r0-r3,lr} + strh r2, [r3, OFFSET_REG_IE - 0x200] + strh r1, [r3, OFFSET_REG_IME - 0x200] + msr spsr_cf, r0 + bx lr + + .pool + + .align 2, 0 @ Don't pad with nop. |