| /* Copyright (C) 2001-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Jakub Jelinek <jakub@redhat.com>. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <stdarg.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <ucontext.h> |
| |
| extern void __start_context (struct ucontext *ucp); |
| |
| void |
| __makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...) |
| { |
| extern void __makecontext_ret (void); |
| unsigned long *sp, *topsp; |
| va_list ap; |
| int i; |
| |
| sp = (unsigned long *) ((long) ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size); |
| sp -= (argc > 6 ? argc : 6) + 32; |
| sp = (unsigned long *) (((long) sp) & -16L); |
| topsp = sp + (argc > 6 ? argc : 6) + 16; |
| |
| ucp->uc_mcontext.mc_gregs[MC_PC] = (long) func; |
| ucp->uc_mcontext.mc_gregs[MC_NPC] = ((long) func) + 4; |
| ucp->uc_mcontext.mc_gregs[MC_O6] = ((long) sp) - 0x7ff; |
| ucp->uc_mcontext.mc_gregs[MC_O7] = ((long) __start_context) - 8; |
| ucp->uc_mcontext.mc_fp = ((long) topsp) - 0x7ff; |
| ucp->uc_mcontext.mc_i7 = 0; |
| topsp[14] = 0; |
| topsp[15] = 0; |
| sp[8] = (long) ucp->uc_link; |
| va_start (ap, argc); |
| for (i = 0; i < argc; ++i) |
| if (i < 6) |
| ucp->uc_mcontext.mc_gregs[MC_O0 + i] = va_arg (ap, long); |
| else |
| sp[16 + i] = va_arg (ap, long); |
| va_end (ap); |
| } |
| |
| weak_alias (__makecontext, makecontext) |
