musl/crt/crt1.c

#include <features.h>

#include "crt_arch.h"

int main();
void _init() __attribute__((weak));
void _fini() __attribute__((weak));
_Noreturn int __libc_start_main(int (*)(), int, char **,
	void (*)(), void(*)(), void(*)());

void __cstart(long *p)
{
	int argc = p[0];
	char **argv = (void *)(p+1);
	__libc_start_main(main, argc, argv, _init, _fini, 0);
}
new mostly-C crt1 implementation the only immediate effect of this commit is enabling PIE support on some archs that did not previously have any Scrt1.s, since the existing asm files for crt1 override this C code. so some of the crt_arch.h files committed are only there for the sake of documenting what their archs "would do" if they used the new C-based crt1. the expectation is that new archs should use this new system rather than using heavy asm for crt1. aside from being easier and less error-prone, it also ensures that PIE support is available immediately (since Scrt1.o is generated from the same C source, using -fPIC) rather than having to be added as an afterthought in the porting process. 2013-07-26 05:49:14 +00:00			`#include <features.h>`

			`#include "crt_arch.h"`

			`int main();`
			`void _init() __attribute__((weak));`
			`void _fini() __attribute__((weak));`
			`_Noreturn int __libc_start_main(int ()(), int, char *,`
			`void ()(), void()(), void(*)());`

			`void __cstart(long *p)`
			`{`
			`int argc = p[0];`
			`char *argv = (void )(p+1);`
			`__libc_start_main(main, argc, argv, _init, _fini, 0);`
			`}`