mirror of https://github.com/pret/pokeemerald.git
551 lines
12 KiB
ArmAsm
551 lines
12 KiB
ArmAsm
@ This library can be used to download and execute a multi-boot image from
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@ a GameCube using the JOY Bus protocol over the link cable.
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.include "asm/macros.inc"
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.include "constants/constants.inc"
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.equiv GCMB_STRUCT_BASE_DEST_PTR, 0x20
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.equiv GCMB_STRUCT_CUR_DEST_PTR, 0x24
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.equiv GCMB_STRUCT_SERIAL_INTR_HANDLER, 0x28
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.equiv ROM_HEADER_NINTENDO_LOGO_OFFSET, 0x4
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.syntax unified
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.text
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thumb_func_start GameCubeMultiBoot_Hash
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GameCubeMultiBoot_Hash: @ 82DED70
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push {r4,lr}
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ldr r4, pool_HashVal
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eors r3, r1
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movs r2, 0x20
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GameCubeMultiBoot_Hash_Loop:
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lsrs r3, 1
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bcc GameCubeMultiBoot_Hash_SkipEor
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eors r3, r4
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GameCubeMultiBoot_Hash_SkipEor:
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subs r2, 0x1
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bne GameCubeMultiBoot_Hash_Loop
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pop {r4,pc}
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thumb_func_end GameCubeMultiBoot_Hash
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thumb_func_start GameCubeMultiBoot_Main
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@ void GameCubeMultiBoot_Main(struct GameCubeMultiBoot *mb);
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GameCubeMultiBoot_Main: @ 82DED84
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ldr r1, [r0, GCMB_STRUCT_SERIAL_INTR_HANDLER]
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cmp r1, 0
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beq _082DEDAA
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ldrb r1, [r0, 0x1]
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adds r1, 0x1
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strb r1, [r0, 0x1]
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ldrb r1, [r0, 0x2]
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cmp r1, 0x2
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beq _082DEDF4
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ldr r3, pool_InterruptRegs
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ldrh r2, [r3, OFFSET_REG_IME - 0x200]
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movs r1, 0
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strh r1, [r3, OFFSET_REG_IME - 0x200]
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ldrb r1, [r0]
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cmp r1, 0xA
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bgt _082DEDA8
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adds r1, 0x1
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strb r1, [r0]
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_082DEDA8:
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strh r2, [r3, OFFSET_REG_IME - 0x200]
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_082DEDAA:
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bcs GameCubeMultiBoot_Init
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ldrb r1, [r0, 0x2]
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cmp r1, 0
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bne _082DEDF6
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ldr r1, [r0, GCMB_STRUCT_CUR_DEST_PTR]
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ldr r2, [r0, GCMB_STRUCT_BASE_DEST_PTR]
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subs r1, r2
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beq _082DEE76
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cmp r1, 0xA0
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bcc _082DEE76
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push {r4-r6}
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movs r1, 0x98
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adds r2, ROM_HEADER_NINTENDO_LOGO_OFFSET
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ldr r4, pool_NintendoLogo
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_082DEDC6:
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ldm r2!, {r5}
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ldm r4!, {r6}
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cmp r5, r6
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bne _082DEDDC
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subs r1, 0x4
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bne _082DEDC6
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ldm r2!, {r5}
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ldm r4!, {r6}
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eors r5, r6
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lsrs r5, 8
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str r2, [r0, GCMB_STRUCT_BASE_DEST_PTR]
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_082DEDDC:
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pop {r4-r6}
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bne GameCubeMultiBoot_Init
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movs r1, 0x1
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strb r1, [r0, 0x2]
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ldr r1, [r0, 0x4]
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ldr r2, [r0, 0x8]
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eors r1, r2
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str r1, [r0, 0x18]
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ldr r2, pool_Kawa
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muls r1, r2
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adds r1, 0x1
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str r1, [r0, 0x14]
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_082DEDF4:
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bx lr
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_082DEDF6:
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ldr r1, [r0, GCMB_STRUCT_CUR_DEST_PTR]
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mov r12, r1
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ldr r3, [r0, 0x18]
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push {r4-r7}
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ldr r4, [r0, GCMB_STRUCT_BASE_DEST_PTR]
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ldr r5, pool_Kawa
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ldr r6, [r0, 0x14]
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ldr r7, pool_HashVal
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_082DEE06:
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cmp r4, r12
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bcs _082DEE26
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ldr r1, [r4]
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eors r1, r6
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adds r1, r3
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stm r4!, {r1}
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eors r3, r1
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movs r2, 0x20
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_082DEE16:
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lsrs r3, 1
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bcc _082DEE1C
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eors r3, r7
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_082DEE1C:
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subs r2, 0x1
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bne _082DEE16
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muls r6, r5
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adds r6, 0x1
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b _082DEE06
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_082DEE26:
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str r4, [r0, GCMB_STRUCT_BASE_DEST_PTR]
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str r6, [r0, 0x14]
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pop {r4-r7}
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str r3, [r0, 0x18]
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ldrh r1, [r0, 0x12]
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cmp r1, 0
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bne _082DEE76
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ldr r1, [r0, GCMB_STRUCT_CUR_DEST_PTR]
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ldr r2, [r0, GCMB_STRUCT_BASE_DEST_PTR]
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cmp r1, r2
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bne _082DEE76
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ldr r1, [r0, 0xC]
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cmp r1, 0
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beq _082DEE60
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ldrh r1, [r0, 0x10]
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cmp r1, 0
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beq _082DEDF4
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mov r12, lr
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movs r1, 0xBB
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ldr r3, [r0, 0xC]
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bl GameCubeMultiBoot_Hash
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ldrh r1, [r0, 0x10]
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mov lr, r12
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subs r1, r3
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bne GameCubeMultiBoot_Init
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movs r1, 0x2
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strb r1, [r0, 0x2]
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bx lr
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_082DEE60:
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mov r12, lr
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ldrb r1, [r0, 0x3]
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lsls r1, 24
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subs r1, 0x1
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str r1, [r0, 0xC]
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bl GameCubeMultiBoot_Hash
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lsls r3, 8
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adds r3, 0xFF
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str r3, [r0, 0x1C]
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bx r12
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_082DEE76:
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bx lr
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thumb_func_end GameCubeMultiBoot_Main
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.align 2, 0
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pool_HashVal: .4byte 0xa1c1
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pool_Kawa: .ascii "Kawa" @ name of BIOS developer
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pool_NintendoLogo: .4byte RomHeaderNintendoLogo
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thumb_func_start GameCubeMultiBoot_ExecuteProgram
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@ void GameCubeMultiBoot_ExecuteProgram(struct GameCubeMultiBoot *mb);
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GameCubeMultiBoot_ExecuteProgram: @ 82DEE84
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ldrb r1, [r0, 0x2]
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cmp r1, 0x2
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bne GameCubeMultiBoot_ExecuteProgram_Fail
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ldr r3, pool_InterruptRegs
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movs r1, 0
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strh r1, [r3, OFFSET_REG_IME - 0x200]
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ldr r1, pool_MultiBootLoadAddr
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adds r1, 0xC0
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bx r1
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GameCubeMultiBoot_ExecuteProgram_Fail:
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bx lr
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thumb_func_end GameCubeMultiBoot_ExecuteProgram
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thumb_func_start GameCubeMultiBoot_Init
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@ void GameCubeMultiBoot_Init(struct GameCubeMultiBoot *mb);
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GameCubeMultiBoot_Init: @ 82DEE98
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ldr r3, pool_InterruptRegs
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@ Save IME register.
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ldrh r2, [r3, OFFSET_REG_IME - 0x200]
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@ Disable interrupts.
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movs r1, 0
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strh r1, [r3, OFFSET_REG_IME - 0x200]
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@ Set the handler to the "Stop" routine.
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@ Unless the first command that is received is a device reset command, the
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@ "Stop" routine will be executed and no further commands will be processed.
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adr r3, GcMbIntrHandler_Stop
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str r3, [r0, GCMB_STRUCT_SERIAL_INTR_HANDLER]
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ldrb r3, [r0, 0x3]
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push {r3}
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ldrb r3, [r0, 0x1]
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push {r0,r3}
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adds r3, r0, 0
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adds r3, GCMB_STRUCT_BASE_DEST_PTR
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@ clear all but the last 3 fields of the struct
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GameCubeMultiBoot_Init_ClearStructLoop:
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stm r0!, {r1}
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cmp r0, r3
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blo GameCubeMultiBoot_Init_ClearStructLoop
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pop {r0,r3}
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lsrs r3, 1
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strb r3, [r0, 0x3]
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pop {r3}
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strb r3, [r0, 0x1]
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ldr r3, pool_SerialRegs
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@ Turn off JOY Bus mode.
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lsls r0, r3, 10
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strh r0, [r3, OFFSET_REG_RCNT - 0x120]
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@ Turn on JOY Bus mode.
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movs r0, 0xC0
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lsls r0, 8
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strh r0, [r3, OFFSET_REG_RCNT - 0x120]
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@ Init JOY Bus registers.
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movs r0, 0x47
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strh r0, [r3, OFFSET_REG_JOYCNT - 0x120]
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strh r1, [r3, OFFSET_REG_JOYSTAT - 0x120]
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ldr r3, pool_InterruptRegs
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@ Acknowledge serial interrupt.
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movs r0, INTR_FLAG_SERIAL
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strh r0, [r3, OFFSET_REG_IF - 0x200]
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@ Enable serial interrupt.
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ldrh r1, [r3, OFFSET_REG_IE - 0x200]
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orrs r1, r0
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strh r1, [r3, OFFSET_REG_IE - 0x200]
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@ Restore IME register.
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strh r2, [r3, OFFSET_REG_IME - 0x200]
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bx lr
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thumb_func_end GameCubeMultiBoot_Init
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non_word_aligned_thumb_func_start GameCubeMultiBoot_HandleSerialInterrupt
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@ void GameCubeMultiBoot_HandleSerialInterrupt(struct GameCubeMultiBoot *mb);
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GameCubeMultiBoot_HandleSerialInterrupt: @ 82DEEE2
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ldr r3, pool_SerialRegs
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@ Acknowledge reset/receive/send flags.
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ldrh r1, [r3, OFFSET_REG_JOYCNT - 0x120]
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strh r1, [r3, OFFSET_REG_JOYCNT - 0x120]
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movs r2, 0
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strb r2, [r0]
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ldr r2, [r0, GCMB_STRUCT_SERIAL_INTR_HANDLER]
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cmp r2, 0
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beq GameCubeMultiBoot_HandleSerialInterruptDone
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lsrs r1, 1 @ was a device reset command received?
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bcs GameCubeMultiBoot_BeginHandshake @ branch if so
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mov pc, r2
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.align 2, 0
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@ Zero the status and the interrupt handler pointer.
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@ Commands from the GameCube will not be processed after this is executed
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@ unless GameCubeMultiBoot_Init() is called again.
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GcMbIntrHandler_Stop:
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movs r2, 0
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strh r2, [r3, OFFSET_REG_JOYSTAT - 0x120]
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GameCubeMultiBoot_SetInterruptHandler:
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str r2, [r0, GCMB_STRUCT_SERIAL_INTR_HANDLER]
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GameCubeMultiBoot_ReadVCount:
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ldr r3, pool_RegDispstat
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ldrh r1, [r3, OFFSET_REG_VCOUNT - OFFSET_REG_DISPSTAT]
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strb r1, [r0, 0x3]
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GameCubeMultiBoot_HandleSerialInterruptDone:
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bx lr
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GameCubeMultiBoot_BeginHandshake:
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ldr r1, [r3, OFFSET_REG_JOY_RECV - 0x120]
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ldr r1, pool_RubyUSAGameCode
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str r1, [r3, OFFSET_REG_JOY_TRANS - 0x120]
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movs r1, 0x10
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strh r1, [r3, OFFSET_REG_JOYSTAT - 0x120]
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ldrb r1, [r0, 0x3]
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strb r1, [r0, 0x9]
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ldrb r1, [r0, 0x2]
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cmp r1, 0
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bne GcMbIntrHandler_Stop
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ldr r1, pool_MultiBootLoadAddr
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str r1, [r0, GCMB_STRUCT_BASE_DEST_PTR]
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str r1, [r0, GCMB_STRUCT_CUR_DEST_PTR]
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adr r2, GcMbIntrHandler_CheckGameCodeSent
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b GameCubeMultiBoot_SetInterruptHandler
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.align 2, 0
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GcMbIntrHandler_CheckGameCodeSent: @ 82DEF24
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lsls r1, 31
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bcc GcMbIntrHandler_Stop @ stop if send failed
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bmi GameCubeMultiBoot_CheckHandshakeResponse @ branch if receive is complete
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@ If the response hasn't been fully received yet,
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@ check again upon the next interrupt.
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adr r2, GcMbIntrHandler_CheckHandshakeResponse
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b GameCubeMultiBoot_SetInterruptHandler
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.align 2, 0
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GcMbIntrHandler_CheckHandshakeResponse: @ 82DEF30
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lsrs r1, 1 @ is receive complete?
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bcc GcMbIntrHandler_Stop @ stop if not
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GameCubeMultiBoot_CheckHandshakeResponse:
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ldr r1, [r3, OFFSET_REG_JOY_RECV - 0x120]
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ldr r2, pool_RubyUSAGameCode
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cmp r1, r2
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bne GcMbIntrHandler_Stop @ stop if the GameCube didn't reply with the same game code
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ldrb r1, [r0, 0x3]
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strb r1, [r0, 0xB]
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adr r2, GcMbIntrHandler_82DEF44
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b GameCubeMultiBoot_SetInterruptHandler
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.align 2, 0
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GcMbIntrHandler_82DEF44: @ 82DEF44
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lsrs r1, 1 @ is receive complete?
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bcc GcMbIntrHandler_Stop @ branch if not
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ldr r1, [r3, OFFSET_REG_JOY_RECV - 0x120]
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lsrs r2, r1, 24
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cmp r2, 0xDD
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bne GcMbIntrHandler_Stop
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str r1, [r0, 0x4]
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ldrb r1, [r0, 0x1]
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strb r1, [r0, 0xA]
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movs r2, 0
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movs r3, 0
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ldr r1, [r0, 0x8]
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lsrs r1, 8
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_082DEF5E:
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lsrs r1, 1
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adcs r2, r3
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cmp r1, 0
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bne _082DEF5E
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cmp r2, 0xE
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bgt _082DEF70
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cmp r2, 0x7
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bge _082DEF72
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movs r1, 0xFF
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_082DEF70:
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strb r1, [r0, 0xA]
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_082DEF72:
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ldr r1, [r0, 0x8]
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adds r1, 0xEE
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ldr r3, pool_SerialRegs
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str r1, [r3, OFFSET_REG_JOY_TRANS - 0x120]
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movs r1, 0x30
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strh r1, [r3, OFFSET_REG_JOYSTAT - 0x120]
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adr r2, GcMbIntrHandler_82DEF84
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b GameCubeMultiBoot_SetInterruptHandler
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.align 2, 0
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GcMbIntrHandler_82DEF84: @ 82DEF84
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lsls r1, 31
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bcc GcMbIntrHandler_Stop @ stop if send failed
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bmi _082DEF94 @ branch if receive is complete
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adr r2, GcMbIntrHandler_82DEF90
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b GameCubeMultiBoot_SetInterruptHandler
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.align 2, 0
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GcMbIntrHandler_82DEF90: @ 82DEF90
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lsrs r1, 1 @ is receive complete?
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bcc GcMbIntrHandler_Stop @ branch if not
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_082DEF94:
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ldr r1, [r3, OFFSET_REG_JOY_RECV - 0x120]
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ldr r2, _082DF034
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cmp r1, r2
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bhs GcMbIntrHandler_Stop
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adds r1, 0x1
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adds r1, r1
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strh r1, [r0, 0x12]
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ldrb r1, [r0, 0x2]
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cmp r1, 0
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_082DEFA6:
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bne GcMbIntrHandler_Stop
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ldr r1, pool_MultiBootLoadAddr
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str r1, [r0, GCMB_STRUCT_BASE_DEST_PTR]
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str r1, [r0, GCMB_STRUCT_CUR_DEST_PTR]
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adr r2, GcMbIntrHandler_82DEFB4
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b GameCubeMultiBoot_SetInterruptHandler
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.align 2, 0
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GcMbIntrHandler_82DEFB4: @ 82DEFB4
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lsrs r1, 1 @ is receive complete?
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bcc GcMbIntrHandler_Stop @ branch if not
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ldr r2, [r0, GCMB_STRUCT_CUR_DEST_PTR]
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movs r1, 0x4
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ands r1, r2
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adds r1, 0x8
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lsls r1, 2
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strh r1, [r3, OFFSET_REG_JOYSTAT - 0x120]
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ldr r1, [r3, OFFSET_REG_JOY_RECV - 0x120]
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stm r2!, {r1}
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str r2, [r0, GCMB_STRUCT_CUR_DEST_PTR]
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ldrh r1, [r0, 0x12]
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subs r1, 0x1
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strh r1, [r0, 0x12]
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bne GameCubeMultiBoot_ReadVCount
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_082DEFD2:
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ldrb r1, [r0, 0x1]
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lsls r1, 8
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adds r1, 0xCC
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str r1, [r3, OFFSET_REG_JOY_TRANS - 0x120]
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adr r2, _082DEFE0
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b GameCubeMultiBoot_SetInterruptHandler
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.align 2, 0
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_082DEFE0:
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lsls r1, 31
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_082DEFE2:
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bcc GcMbIntrHandler_Stop
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ldr r1, [r0, 0x1C]
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cmp r1, 0
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beq _082DEFD2
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str r1, [r3, OFFSET_REG_JOY_TRANS - 0x120]
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adr r2, GcMbIntrHandler_82DEFF0
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b GameCubeMultiBoot_SetInterruptHandler
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.align 2, 0
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GcMbIntrHandler_82DEFF0: @ 82DEFF0
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lsls r1, 31
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bcc _082DEFE2 @ branch if send failed
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bmi _082DF000 @ branch if receive is complete
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adr r2, GcMbIntrHandler_82DEFFC
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b GameCubeMultiBoot_SetInterruptHandler
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.align 2, 0
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GcMbIntrHandler_82DEFFC: @ 82DEFFC
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lsrs r1, 1 @ is receive complete?
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bcc _082DEFE2 @ branch if not
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_082DF000:
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ldr r1, [r3, OFFSET_REG_JOY_RECV - 0x120]
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lsrs r2, r1, 24
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cmp r2, 0xBB
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bne _082DEFA6
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strh r1, [r0, 0x10]
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adr r2, GcMbIntrHandler_82DF010
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b GameCubeMultiBoot_SetInterruptHandler
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.align 2, 0
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GcMbIntrHandler_82DF010: @ 82DF010
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b GcMbIntrHandler_Stop
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thumb_func_end GameCubeMultiBoot_HandleSerialInterrupt
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non_word_aligned_thumb_func_start GameCubeMultiBoot_Quit
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@ void GameCubeMultiBoot_Quit();
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GameCubeMultiBoot_Quit: @ 82DF012
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ldr r3, pool_InterruptRegs
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@ Save IME register.
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ldrh r2, [r3, OFFSET_REG_IME - 0x200]
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@ Disable interrupts.
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movs r1, 0
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strh r1, [r3, OFFSET_REG_IME - 0x200]
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ldr r3, pool_SerialRegs
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@ Acknowledge all JOYCNT flags.
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movs r0, 0x7
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strh r0, [r3, OFFSET_REG_JOYCNT - 0x120]
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@ Turn off JOY Bus mode.
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lsls r0, r3, 10
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strh r0, [r3, OFFSET_REG_RCNT - 0x120] @ store 0x8000
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ldr r3, pool_InterruptRegs
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@ Acknowledge serial interrupt.
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movs r0, INTR_FLAG_SERIAL
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strh r0, [r3, OFFSET_REG_IF - 0x200]
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@ Disable serial interrupt.
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ldrh r1, [r3, OFFSET_REG_IE - 0x200]
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bics r1, r0
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strh r1, [r3, OFFSET_REG_IE - 0x200]
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@ Restore IME register.
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strh r2, [r3, OFFSET_REG_IME - 0x200]
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bx lr
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thumb_func_end GameCubeMultiBoot_Quit
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.align 2, 0
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_082DF034: .4byte 0x4000
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pool_InterruptRegs: .4byte REG_BASE + 0x200
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pool_SerialRegs: .4byte REG_BASE + 0x120
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pool_RegDispstat: .4byte REG_DISPSTAT
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pool_RubyUSAGameCode: .ascii "AXVE"
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pool_MultiBootLoadAddr: .4byte EWRAM_START
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.align 2, 0 @ Don't pad with nop.
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