99 lines
2.6 KiB
ArmAsm
99 lines
2.6 KiB
ArmAsm
.arm.little
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.create "build/romfsredir.bin", 0
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.macro addr, reg, func
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add reg, pc, #func-.-8
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.endmacro
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.macro load, reg, func
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ldr reg, [pc, #func-.-8]
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.endmacro
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; Patch by delebile
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.arm
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_start:
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; Jumps here before the fsOpenFileDirectly call
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_mountArchive:
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b mountArchive
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.word 0xdead0000 ; Substituted opcode
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.word 0xdead0001 ; Branch to hooked function
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; Jumps here before every iFileOpen call
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_fsRedir:
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b fsRedir
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.word 0xdead0002 ; Substituted opcode
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.word 0xdead0003 ; Branch to hooked function
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; Mounts the archive and registers it as 'lf:'
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mountArchive:
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cmp r3, #3
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bne _mountArchive + 4
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stmfd sp!, {r0-r4, lr}
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sub sp, sp, #4
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load r1, archiveId
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mov r0, sp
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load r4, fsMountArchive
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blx r4
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mov r3, #0
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mov r2, #0
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ldr r1, [sp]
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addr r0, archiveName
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load r4, fsRegisterArchive
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blx r4
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add sp, sp, #4
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ldmfd sp!, {r0-r4, lr}
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b _mountArchive + 4
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; Check the path passed to iFileOpen.
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; If it is trying to access a RomFS file, we try to
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; open it from the LayeredFS folder.
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; If the file cannot be opened, we just open
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; it from its original archive like nothing happened
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fsRedir:
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stmfd sp!, {r0-r12, lr}
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ldrb r12, [r1]
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cmp r12, #0x72 ; 'r', should include "rom:", "rom2:" and "rex:"
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bne endRedir
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sub sp, sp, #0x400
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pathRedir:
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stmfd sp!, {r0-r3}
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add r0, sp, #0x10
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addr r3, customPath
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pathRedir_1:
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ldrb r2, [r3], #1
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strh r2, [r0], #2
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cmp r2, #0
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bne pathRedir_1
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sub r0, r0, #2
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pathRedir_2:
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ldrh r2, [r1], #2
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cmp r2, #0x3A ; ':'
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bne pathRedir_2
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pathRedir_3:
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ldrh r2, [r1], #2
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strh r2, [r0], #2
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cmp r2, #0
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bne pathRedir_3
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ldmfd sp!, {r0-r3}
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mov r1, sp
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bl _fsRedir + 4
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add sp, sp, #0x400
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cmp r0, #0
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endRedir:
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ldmfd sp!, {r0-r12, lr}
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moveq r0, #0
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bxeq lr
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b _fsRedir + 4
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.pool
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.align 4
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archiveName : .dcb "lf:", 0
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fsMountArchive : .word 0xdead0005
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fsRegisterArchive : .word 0xdead0006
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archiveId : .word 0xdead0007
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customPath : .word 0xdead0004
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.close
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