OrionLibC

#include <stdint.h>
#include <sys/mman.h>
#include <sys/syscall.h>
#include <errno.h>

void *
mmap(void *addr, size_t len, int prot, int flags, int fildes, off_t off)
{
	int ret;
	asm volatile("int $0x80" : "=a" (ret) : "0" (SYSCALL_MMAP),
	             "c" (6), "S" (&addr));
	if (ret >= 0)
		return (void *) ret;
	errno = -ret;
	return MAP_FAILED;
}