mirror of
https://github.com/LNH-team/pico-loader.git
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1d18f06b4c
Fixes Tropix! ...Your Island Getaway and Think - Training für den Kopf - Kids - Spiel Dich Schlau!
80 lines
2.0 KiB
ArmAsm
80 lines
2.0 KiB
ArmAsm
.cpu arm946e-s
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.section "patch_cardireadcard", "ax"
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.syntax unified
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.thumb
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.global patch_cardireadcard_entry
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.type patch_cardireadcard_entry, %function
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patch_cardireadcard_entry:
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.global patch_cardireadcard_return_offset
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patch_cardireadcard_return_offset:
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movs r0, #0x38
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add lr, r0
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push {r1,r2,r3,r4,r6,lr}
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ldr r3, __patch_cardireadcard_fix_cp15_asm_address
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blx r3
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.global patch_cardireadcard_mov_src_to_r0
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patch_cardireadcard_mov_src_to_r0:
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nop
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ldr r3, __patch_cardireadcard_rom_offset_to_sd_sector_asm_address
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blx r3
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movs r2, #1 // r2 = sector count
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.global patch_cardireadcard_mov_dst_to_r1
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patch_cardireadcard_mov_dst_to_r1:
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mov r1, r8 // r1 = dst
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.global patch_cardireadcard_mov_cardicommon_to_r6
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patch_cardireadcard_mov_cardicommon_to_r6:
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movs r6, r4 // r6 = cardi_common
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.global patch_cardireadcard_adjust_cardicommon_offset
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patch_cardireadcard_adjust_cardicommon_offset:
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subs r6, #0
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ldr r4, [r6, #0x20] // r4 = actual dst
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cmp r4, r1
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bne do_read // if dst != actual dst the cache is in use
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ldr r2, [r6, #0x24] // remaining length
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lsrs r2, r2, #9 // sectors left to read
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cmp r2, lr
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ble 1f
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mov r2, lr // clip to cluster boundary
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1:
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subs r4, r2, #1
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lsls r4, r4, #9
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ldr r3, [r6, #0x1C]
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adds r3, r3, r4
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str r3, [r6, #0x1C]
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ldr r3, [r6, #0x20]
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adds r3, r3, r4
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str r3, [r6, #0x20]
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.global patch_cardireadcard_mov_r3_to_dst
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patch_cardireadcard_mov_r3_to_dst:
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mov r8, r3
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ldr r3, [r6, #0x24]
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subs r3, r3, r4
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str r3, [r6, #0x24]
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do_read:
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ldr r3, __patch_cardireadcard_sdread_asm_address
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blx r3
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pop {r1,r2,r3,r4,r6,pc}
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.balign 4
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.global __patch_cardireadcard_fix_cp15_asm_address
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__patch_cardireadcard_fix_cp15_asm_address:
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.word 0
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.global __patch_cardireadcard_rom_offset_to_sd_sector_asm_address
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__patch_cardireadcard_rom_offset_to_sd_sector_asm_address:
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.word 0
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.global __patch_cardireadcard_sdread_asm_address
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__patch_cardireadcard_sdread_asm_address:
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.word 0
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.pool
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.end |