80 lines
2.4 KiB
ArmAsm
80 lines
2.4 KiB
ArmAsm
; Code from delebile
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.arm.little
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.create "build/romfsredir.bin", 0
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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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.arm
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; fsOpenFileDirectly function will be redirected here.
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; If the requested archive is not ROMFS, we'll return
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; to the original function.
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openFileDirectlyHook:
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cmp r3, #3
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beq openRomfs
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load r12, fsOpenFileDirectly
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nop ; Will be replaced with the original function opcode
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bx r12
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; We redirect ROMFS file opening by changing the parameters and call
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; the fsOpenFileDirectly function recursively. The parameter format:
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; r0 : fsUserHandle
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; r1 : Output FileHandle
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; r2 : Transaction (usually 0)
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; r3 : Archive ID
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; [sp, #0x00] : Archive PathType
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; [sp, #0x04] : Archive DataPointer
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; [sp, #0x08] : Archive PathSize
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; [sp, #0x0C] : File PathType
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; [sp, #0x10] : File DataPointer
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; [sp, #0x14] : File PathSize
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; [sp, #0x18] : File OpenFlags
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; [sp, #0x1C] : Attributes (usually 0)
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openRomfs:
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sub sp, sp, #0x50
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stmfd sp!, {r0, r1, lr}
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add sp, sp, #0x5C
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str r3, [sp, #0x0C] ; File PathType (ASCII = 3)
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load r12, romfsFileName
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str r12, [sp, #0x10] ; File DataPointer
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load r12, romfsFileNameSize
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str r12, [sp, #0x14] ; File PathSize
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load r3, archive
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bl openFileDirectlyHook
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sub sp, sp, #0x5C
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ldmfd sp!, {r0, r1, lr}
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add sp, sp, #0x50
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mov r0, r1 ; Substitute fsUserHandle with the fileHandle
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; Once we have the sd romfs file opened, we'll open a subfile
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; in order to skip the useless data.
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stmfd sp!, {r1, r3-r11}
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mrc p15, 0, r4, c13, c0, 3
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add r4, r4, #0x80
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mov r1, r4
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add r3, pc, #fsOpenSubFileCmd-.-8
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ldmia r3!, {r5-r9}
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stmia r1!, {r5-r9}
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ldr r0, [r0]
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swi 0x32
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ldr r0, [r4, #0x0C]
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ldmfd sp!, {r1, r3-r11}
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str r0, [r1]
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mov r0, #0
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bx lr
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.pool
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.align 4
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; Part of these symbols will be set from outside
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fsOpenFileDirectly : .word 0
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fsOpenSubFileCmd : .word 0x08010100
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.word 0 ; File Offset
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.word 0
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.word 0 ; File Size
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.word 0
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archive : .word 0
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romfsFileNameSize : .word 0
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romfsFileName : .word 0 ; File DataPointer
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.close |