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126 lines
2.6 KiB
126 lines
2.6 KiB
// 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 __text_start - _start
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.word __text_size
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.word __rodata_start - _start
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.word __rodata_size
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.word __data_start - _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.start, "x"
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.global start
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start:
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// save lr
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mov x7, x30
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// get aslr base
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bl +4
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sub x6, x30, #0x88
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// context ptr and main thread handle
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mov x25, x0
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mov x26, x1
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// Save ASLR Base to use later
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mov x0, x6
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adrp x4, _saved_return_address
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str x7, [x4, #:lo12:_saved_return_address]
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adrp x4, _context
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str x25, [x4, #:lo12:_context]
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adrp x4, _main_thread
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str x26, [x4, #:lo12:_main_thread]
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// store stack pointer
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mov x26, sp
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adrp x4, _stack_top
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str x26, [x4, #:lo12:_stack_top]
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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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// ASLR base on x0
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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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// call entrypoint
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b main
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.global __nx_exit
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.type __nx_exit, %function
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__nx_exit:
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// Exit code in x0
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// restore stack pointer
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mov sp, x1
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// jump back to loader
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br x2
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.section .data.horizon
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.align 8
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.global _saved_return_address // Saved return address.
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// This might be different than null when coming from launcher
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_saved_return_address:
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.dword 0
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.global _context // Homebrew Launcher Context
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// This might be different than null when not coming from launcher
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_context:
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.dword 0
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.global _main_thread
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_main_thread:
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.dword 0
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.global _stack_top
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_stack_top:
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.dword 0
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