131 lines
4.0 KiB
ArmAsm
131 lines
4.0 KiB
ArmAsm
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@ Patch by delebile
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.section .data.romfsRedirPatch, "aw", %progbits
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.align 4
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.global romfsRedirPatch
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romfsRedirPatch:
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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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.global romfsRedirPatchSubstituted1
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romfsRedirPatchSubstituted1:
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.word 0xdead0000 @ Substituted opcode
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.global romfsRedirPatchHook1
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romfsRedirPatchHook1:
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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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.global romfsRedirPatchSubstituted2
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romfsRedirPatchSubstituted2:
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.word 0xdead0002 @ Substituted opcode
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.global romfsRedirPatchHook2
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romfsRedirPatchHook2:
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.word 0xdead0002 @ 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 romfsRedirPatchSubstituted1
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stmfd sp!, {r0-r4, lr}
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sub sp, sp, #4
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adr r1, romfsRedirPatchArchiveId
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mov r0, sp
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ldr r4, romfsRedirPatchFsMountArchive
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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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adr r0, romfsRedirPatchArchiveName
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ldr r4, romfsRedirPatchFsRegisterArchive
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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 romfsRedirPatchSubstituted1
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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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adr r3, romfsRedirPatchRomFsMount
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bl compare
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adrne r3, romfsRedirPatchUpdateRomFsMount
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blne compare
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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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ldr r3, romfsRedirPatchCustomPath
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pathRedir_1:
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ldrb r2, [r3], #1
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cmp r2, #0
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strneh r2, [r0], #2
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bne pathRedir_1
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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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@ Skip a slash if there are two after the mountpoint,
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@ as some games mistakenly have those
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ldrh r3, [r1, #2]
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cmp r3, #0x2F @ '/'
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pathRedir_3:
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ldrh r2, [r1], #2
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strneh 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 romfsRedirPatchSubstituted2
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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 romfsRedirPatchSubstituted2
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compare:
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mov r9, r1
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add r10, r3, #4
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loop:
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ldrb r12, [r3], #1
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ldrb r11, [r9], #2
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cmp r11, r12
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bxne lr
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cmp r10, r3
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bne loop
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bx lr
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.pool
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.balign 4
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.global romfsRedirPatchArchiveName
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.global romfsRedirPatchFsMountArchive
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.global romfsRedirPatchFsRegisterArchive
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.global romfsRedirPatchArchiveId
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.global romfsRedirPatchRomFsMount
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.global romfsRedirPatchUpdateRomFsMount
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.global romfsRedirPatchCustomPath
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romfsRedirPatchArchiveName : .ascii "lf:\0"
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romfsRedirPatchFsMountArchive : .word 0xdead0005
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romfsRedirPatchFsRegisterArchive : .word 0xdead0006
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romfsRedirPatchArchiveId : .word 0xdead0007
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romfsRedirPatchRomFsMount : .ascii "rom:"
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romfsRedirPatchUpdateRomFsMount : .word 0xdead0008
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romfsRedirPatchCustomPath : .word 0xdead0004
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_romfsRedirPatchEnd:
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.global romfsRedirPatchSize
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romfsRedirPatchSize:
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.word _romfsRedirPatchEnd - romfsRedirPatch
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