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Fix and rewrite parts of k11modules.s

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TuxSH 2016-08-15 21:07:06 +02:00
parent 802bce12a7
commit 8d5d8d2100
1 changed files with 49 additions and 60 deletions
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109
patches/k11modules.s
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@ -42,86 +42,75 @@
; Save the value of all registers
push {r0-r12}
; Clear all the caches, just to be safe
mcr p15, 0, r6, c7, c14, 0
mcr p15, 0, r6, c7, c5, 0
ldr r0, [r0, #(0x80 - 0x7C)] ; Load the .text address
ldr r2, [r7, #0x18] ; Load the size of the .text
ldr r7, [r4]
ldr r8, [r7, #0x200] ; Load the low title id of the current NCCH
ldr r2, [r7, #0x18]
mov r5, r0
add r11, r5, r2 ; Max bounds of the memory region
add r11, r5, r2 ; Max bounds of the memory region
ldr r9, =0x00001002 ; Low title id of the sm module
ldr r7, [r4]
ldr r8, [r7, #0x200] ; Load the low title id of the current NCCH
cmp r8, r9 ; 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 r7, =0xE5901024 ; mov r6, r2
ldr r8, =0xE1B02001 ; mov r7, #0
ldr r9, =0x0A00000A ; ldr r1, [r2, #0x24]
ldr r10, =0xE5915014 ; movs r2, r1
loop:
cmp r11, r5
blo out ; Check if we didn't go past the bounds of the memory region
loop_sm: ; patch adapted from BootNTR
cmp r5, r11
bhs out
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
bne loop
bne loop_sm_continue
ldr r6, [r5, #4]
cmp r6, r8
bne loop_sm_continue
ldr r6, [r5, #8]
cmp r6, r9
bne loop_sm_continue
ldr r6, [r5, #12]
cmp r6, r10
bne loop_sm_continue
ldr r9, =0xE3A00002 ; mov r0, #2
ldr r10, =0xE12FFF1E ; bx lr
str r9, [r5, #-8]
str r10, [r5, #-4]
b out
loop_sm_continue:
add r5, r5, #4
b loop_sm
; 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
b out
fs_patch: ; patch adapted from BootNTR
ldr r9, =0x00001102 ; Low title id of the fs module
ldr r7, [r4]
ldr r8, [r7, #0x200] ; Load the low title id of the current NCCH
cmp r8, r9 ; 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
cmp r8, r9 ; Compare the low title id to the id of the fs module
bne out ; Skip if they're not the same
ldr r7, =0x4618 ; mov r0, r3
ldr r8, =0x3481 ; add r4, #0x81
loop_fs:
cmp r11, r5
blo out
ldrh r6, [r5]
cmp r6, r7
ldreqh r6, [r5, #2]
cmpeq r6, r8
subeq r8, r5, #8
addne r5, #2
bne loop
; 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]
cmp r5, r11
bhs out
ldrh r6, [r5]
cmp r6, r7
bne loop_fs_continue
ldrh r6, [r5, #2]
cmp r6, r8
bne loop_fs_continue
ldr r9, =0x2001 ; mov r0, #1
ldr r10, =0x4770 ; bx lr
strh r9, [r5, #-8]
strh r10, [r5, #-6]
b out
loop_fs_continue:
add r5, #2
b loop_fs
out:
pop {r0-r12} ; Restore the registers we used
; Clear all the caches again, just to be safe
mcr p15, 0, r6, c7, c14, 0
mcr p15, 0, r6, c7, c5, 0
ldr r0, [r4] ; Execute the instruction we overwrote in our detour
bx lr ; Jump back to whoever called us