9e599bac49
By modifying the linker script a bit and adding the NRO0 header directly
in the assembly, it's possible to craft an ELF file that can be
converted straight to a binary (using objcopy or similar) that is a NRO
file. This avoids custom code for NRO files or an extra build step.
With another change, .nro files are recognized by TinyGo so that this
will create a ready-to-run NRO file:
tinygo build -o test.nro -target=nintendoswitch examples/serial
77 строки
1,5 КиБ
ArmAsm
77 строки
1,5 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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.word 0
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.word 0
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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
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.word __text_size
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.word __rodata_start
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.word __rodata_size
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.word __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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// 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 x5, x0
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mov x4, x1
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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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// call entrypoint
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adrp x30, exit
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add x30, x30, #:lo12:exit
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b main
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