PTE patch code (RWX map) for new iBoot

internationalhackingsolutionsfbi.s

.text

.pool

.set ARM_TTE_BLOCK_PNX, 0x0020000000000000
.set ARM_TTE_BLOCK_NX, 0x0040000000000000
.set SDRAM_PAGE1, 0x180082000
.set SRAM_PAGE1, 0x1800841F0

.global _main



_main:
MOV X5, X30
LDR X0, =0x800000000
BL _cache_clean_and_invalidate_page
MOV X0, #0
SVC #0
IC IALLU




mrs x4, sctlr_el1
mov x0, #0
msr sctlr_el1, x0

LDR X0, =SRAM_PAGE1
LDR X0, [X0]
and x0, x0, #0xffffffffffffff7f
LDR X1, =SRAM_PAGE1
STR X0, [X1]

LDR X0, =SDRAM_PAGE1
LDR X0, [X0]
BIC X0, X0, (ARM_TTE_BLOCK_PNX | ARM_TTE_BLOCK_NX)
LDR X1, =SDRAM_PAGE1
STR X0, [X1]

mov x0, x4
BIC X0, X0, #0x80000
msr sctlr_el1, x0



DSB SY
TLBI VMALLE1
DSB SY
ISB


MRS X0, SPSR_EL1
AND X0, X0, #0xFFFFFFFFFFFFFFF3
MSR SPSR_EL1, X0
MOV X0, X5
MSR ELR_EL1, X0
ERET


_cache_clean_and_invalidate_page:
mov x1, #0x80000
mov x2, #0

_one:
cmp x1, x2
b.eq _two
dc civac, x0
add x0, x0, #0x40
add x2, x2, #0x40
b _one



_two:
RET