| /* Copyright (C) 2011-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011. |
| |
| 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 <stdint.h> |
| #include <stdlib.h> |
| #include <ucontext.h> |
| #include <arch/abi.h> |
| |
| void |
| __makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...) |
| { |
| extern void __startcontext (void); |
| uint_reg_t *sp, *args; |
| va_list ap; |
| int i; |
| |
| /* Initialize the top of stack. */ |
| sp = (uint_reg_t *) ((((intptr_t) ucp->uc_stack.ss_sp |
| + ucp->uc_stack.ss_size) & -16L) - 16); |
| |
| /* Allow room for memory-passed arguments if necessary. */ |
| if (argc > 10) |
| sp -= 2 + (argc - 10); |
| |
| sp[0] = sp[1] = 0; |
| |
| /* Set parameters. */ |
| va_start (ap, argc); |
| args = &ucp->uc_mcontext.gregs[0]; |
| for (i = 0; i < argc; i++) |
| { |
| if (i == 10) |
| args = &sp[2]; |
| *args++ = va_arg (ap, long); |
| } |
| va_end (ap); |
| |
| /* Start in the trampoline. */ |
| ucp->uc_mcontext.pc = (long) __startcontext; |
| |
| /* Set stack pointer. */ |
| ucp->uc_mcontext.sp = (long) sp; |
| |
| /* Pass FUNC to __startcontext in r31. */ |
| ucp->uc_mcontext.gregs[31] = (long) func; |
| |
| /* Pass ucp->uc_link to __startcontext in r30. */ |
| ucp->uc_mcontext.gregs[30] = (long) ucp->uc_link; |
| } |
| weak_alias (__makecontext, makecontext) |