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Cleanup the modules patch (makes it considerably smaller too

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Aurora 2016-10-15 05:00:09 +02:00
parent b58cbd228c
commit a795a45c34
1 changed files with 44 additions and 63 deletions
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91
patches/k11modules.s
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@ -37,82 +37,63 @@
; r6: Constant 0
; SP + 0x80 - 0x7C: Pointer to the memory location where the NCCH text was loaded
; Save the value of sp
mov r0, sp
; Save the value of all registers
push {r0-r12}
; Save the value of the register we use
push {r1-r4}
ldr r0, [r0, #(0x80 - 0x7C)] ; Load the .text address
ldr r7, [r4]
ldr r2, [r7, #0x18] ; Load the size of the .text
ldr r8, [r7, #0x200] ; Load the low title id of the current NCCH
mov r5, r0
add r11, r5, r2 ; Max bounds of the memory region
ldr r0, [sp, #20] ; Load the .text address
ldr r1, [r4]
ldr r2, [r1, #0x200] ; Load the low title id of the current NCCH
ldr r1, [r1, #0x18] ; Load the size of the .text
add r1, r0, r1 ; Max bounds of the memory region
ldr r9, =0x00001002 ; Low title id of the sm module
cmp r8, r9 ; Compare the low title id to the id of the sm module
ldr r3, =0x1002 ; Low title id of the sm module
cmp r2, r3 ; Compare the low title id to the id of the sm module
bne fs_patch ; Skip if they're not the same
ldr r7, =0xE1A01006 ; mov r1, r6
ldr r8, =0xE1A00005 ; mov r0, r5
ldr r9, =0xE3500000 ; cmp r0, #0
ldr r10, =0xE2850004 ; add r0, r5, #4
ldr r2, =0xE1A01006 ; mov r1, r6
loop:
cmp r11, r5
cmp r1, r0
blo out ; Check if we didn't go past the bounds of the memory region
ldr r6, [r5]
cmp r6, r7
ldreq r6, [r5, #4]
cmpeq r6, r8
ldreq r6, [r5, #12]
cmpeq r6, r9
ldreq r6, [r5, #24]
cmpeq r6, r10
moveq r8, r5
addne r5, r5, #4
ldr r3, [r0]
cmp r3, r2
ldreqh r3, [r0, #4]
cmpeq r3, #5
addne r0, #4
bne loop
; r8 now contains the start address of the pattern we found
; Write NOPs to the four instructions we want to patch
ldr r9, =0xE320F000 ; nop
str r9, [r8, #8] ; Patch the bl
str r9, [r8, #12] ; Patch the cmp
str r9, [r8, #16] ; Patch the ldreq
str r9, [r8, #20] ; Patch the beq
; r0 now contains the start address of the pattern we found
ldr r1, =0xE3A00001 ; mov r0, #1
str r1, [r0, #8] ; Patch the bl
b out
fs_patch: ; patch adapted from BootNTR
ldr r9, =0x00001102 ; Low title id of the fs module
cmp r8, r9 ; Compare the low title id to the id of the sm module
ldr r3, =0x1102 ; Low title id of the fs module
cmp r2, r3 ; Compare the low title id to the id of the sm module
bne out ; Skip if they're not the same
ldr r7, =0x4618 ; mov r0, r3
ldr r8, =0x3481 ; add r4, #0x81
ldr r2, =0x4618 ; mov r0, r3
ldr r3, =0x3481 ; add r4, #0x81
loop_fs:
cmp r11, r5
cmp r1, r0
blo out
ldrh r6, [r5]
cmp r6, r7
ldreqh r6, [r5, #2]
cmpeq r6, r8
subeq r8, r5, #8
addne r5, #2
ldrh r4, [r0]
cmp r4, r2
ldreqh r4, [r0, #2]
cmpeq r4, r3
subeq r0, #8
addne r0, #2
bne loop_fs
; r8 now contains the start address of the pattern we found
ldr r9, =0x2001 ; mov r0, #1
ldr r10, =0x4770 ; bx lr
strh r9, [r8]
strh r10, [r8, #2]
; r0 now contains the start address of the pattern we found
ldr r1, =0x2001 ; mov r0, #1
ldr r2, =0x4770 ; bx lr
strh r1, [r0]
strh r2, [r0, #2]
out:
pop {r0-r12} ; Restore the registers we used
pop {r1-r4} ; Restore the registers we used
ldr r0, [r4] ; Execute the instruction we overwrote in our detour
bx lr ; Jump back to whoever called us
.pool