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