amd64/gen/makecontext.c

39 static void makectx_wrapper(ucontext_t *ucp, func_t func, uint64_t *args);
44 __makecontext(ucontext_t *ucp, void (*start)(void), int argc, ...)
52 	if ((ucp == NULL) || (ucp->uc_mcontext.mc_len != sizeof(mcontext_t)))
54 	else if ((argc < 0) || (argc > 6) || (ucp->uc_stack.ss_sp == NULL) ||
55 	    (ucp->uc_stack.ss_size < MINSIGSTKSZ)) {
62 		ucp->uc_mcontext.mc_len = 0;
67 	sp = (uint64_t *)(ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size);
88 	ucp->uc_mcontext.mc_rdi = (register_t)ucp;
89 	ucp->uc_mcontext.mc_rsi = (register_t)start;
90 	ucp->uc_mcontext.mc_rdx = (register_t)args;
91 	ucp->uc_mcontext.mc_rbp = 0;
92 	ucp->uc_mcontext.mc_rbx = (register_t)sp;
93 	ucp->uc_mcontext.mc_rsp = (register_t)sp;
94 	ucp->uc_mcontext.mc_rip = (register_t)makectx_wrapper;
98 makectx_wrapper(ucontext_t *ucp, func_t func, uint64_t *args)
101 	if (ucp->uc_link == NULL)
103 	setcontext((const ucontext_t *)ucp->uc_link);