95 строки
2 КиБ
ArmAsm
95 строки
2 КиБ
ArmAsm
// For more information on the .nro file format, see:
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// https://switchbrew.org/wiki/NRO
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.section .text.jmp, "x"
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.global _start
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_start:
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b start
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.word _mod_header - _start
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.ascii "HOMEBREW"
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.ascii "NRO0" // magic
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.word 0 // version (always 0)
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.word __bss_start - _start // total NRO file size
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.word 0 // flags (unused)
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// segment headers
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.word 0 // __text_start
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.word __text_size
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.word 0 //__rodata_start
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.word __rodata_size
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.word 0 //__data_start
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.word __data_size
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.word __bss_size
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.word 0
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// ModuleId (not supported)
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. = 0x50; // skip 32 bytes
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.word 0 // DSO Module Offset (unused)
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.word 0 // reserved (unused)
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.section .data.mod0
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.word 0, 8
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.global _mod_header
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_mod_header:
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.ascii "MOD0"
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.word __dynamic_start - _mod_header
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.word __bss_start - _mod_header
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.word __bss_end - _mod_header
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.word 0, 0 // eh_frame_hdr start/end
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.word 0 // runtime-generated module object offset
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.section .text, "x"
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.global start
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start:
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// Get ASLR Base
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adrp x6, _start
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// context ptr and main thread handle
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mov x5, x0
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mov x4, x1
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// Save lr, context pointer, main thread handler
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adrp x0, _aslr_base
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str x6, [x0, #:lo12:_aslr_base]
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// clear .bss
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adrp x5, __bss_start
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add x5, x5, #:lo12:__bss_start
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adrp x6, __bss_end
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add x6, x6, #:lo12:__bss_end
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bssloop:
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cmp x5, x6
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b.eq run
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str xzr, [x5]
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add x5, x5, 8
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b bssloop
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run:
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// process .dynamic section
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adrp x0, _aslr_base
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ldr x0, [x0, #:lo12:_aslr_base]
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adrp x1, _DYNAMIC
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add x1, x1, #:lo12:_DYNAMIC
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bl __dynamic_loader
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// set LR to svcExitProcess if it's null
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adrp x3, exit
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add x3, x3, #:lo12:exit
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cmp x30, xzr
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csel x30, x3, x30, eq
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// call entrypoint
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mov x3, sp
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sub sp, sp, 0x10
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stp x29, x30, [sp]
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b main
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.section .data.horizon
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.align 8
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.global _aslr_base // Placeholder for ASLR Base Address
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_aslr_base:
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.dword 0
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