add a AT_ENTRY entry to the auxiliary vector

executer/user/mcexec.c

@@ -152,6 +152,7 @@ struct program_load_desc *load_elf(FILE *fp)
 	desc->at_phdr = load_addr + hdr.e_phoff;
 	desc->at_phent = sizeof(phdr);
 	desc->at_phnum = hdr.e_phnum;
+	desc->at_entry = hdr.e_entry;
 
 	return desc;
 }