mirror of https://github.com/Shizmob/smol
50 lines
1.1 KiB
C
50 lines
1.1 KiB
C
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#include <stddef.h>
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extern int main(int argc, char* argv[]);
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extern int __libc_start_main(int (*main)(int, char**),
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int argc, char** argv,
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void (*init)(void), void(*fini)(void),
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void (*rtld_fini)(void),
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void* stack) __attribute__((__noreturn__));
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__attribute__((__externally_visible__, __section__(".text.startup._start"),
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__noreturn__, __used__
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#ifdef __x86_64__
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, __naked__
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#endif
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))
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int _start(void* stack
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#ifdef USE_DL_FINI
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, void (*dl_fini)(void)
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#endif
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) {
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int argc=*(size_t*)stack;
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char** argv=(void*)(&((size_t*)stack)[1]);
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// avoid problems when -fno-plt is enabled
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#ifdef __x86_64__
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asm volatile("xor %%ecx, %%ecx\n"
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"push %%rcx\n"
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"push %%rcx\n"
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"pop %%r8\n"
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"pop %%r9\n"
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"jmp *__libc_start_main@GOTPCREL(%%rip)\n"
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:
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:"S"(argc), "D" (main), "d" (argv)
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:);
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#else
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__libc_start_main(main, argc, argv, NULL, NULL,
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#ifdef USE_DL_FINI
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dl_fini
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#else
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NULL
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#endif
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, (void*)stack);
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#endif
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__builtin_unreachable();
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}
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