| /* Copyright (C) 2001-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by David Mosberger-Tang <davidm@hpl.hp.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 <libintl.h> |
| #include <stdarg.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <ucontext.h> |
| #include <sys/rse.h> |
| #include <link.h> |
| #include <dl-fptr.h> |
| |
| |
| #define PUSH(val) \ |
| do { \ |
| if (ia64_rse_is_rnat_slot (rbs)) \ |
| *rbs++ = 0; \ |
| *rbs++ = (val); \ |
| } while (0) |
| |
| |
| /* This implementation can handle an ARGC value of at most 8 and |
| values can be passed only in integer registers (r32-r39). */ |
| |
| void |
| __makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...) |
| { |
| struct sigcontext *sc = &ucp->uc_mcontext; |
| extern void __start_context (ucontext_t *link, long gp, ...); |
| unsigned long stack_start, stack_end; |
| va_list ap; |
| unsigned long *rbs; |
| int i; |
| |
| stack_start = (long) sc->sc_stack.ss_sp; |
| stack_end = (long) sc->sc_stack.ss_sp + sc->sc_stack.ss_size; |
| |
| stack_start = (stack_start + 7) & -8; |
| stack_end = stack_end & -16; |
| |
| if (argc > 8) |
| { |
| fprintf (stderr, _("\ |
| makecontext: does not know how to handle more than 8 arguments\n")); |
| exit (-1); |
| } |
| |
| /* set the entry point and global pointer: */ |
| sc->sc_br[0] = ELF_PTR_TO_FDESC (&__start_context)->ip; |
| sc->sc_br[1] = ELF_PTR_TO_FDESC (func)->ip; |
| sc->sc_gr[1] = ELF_PTR_TO_FDESC (func)->gp; |
| |
| /* set up the call frame: */ |
| sc->sc_ar_pfs = ((sc->sc_ar_pfs & ~0x3fffffffffUL) |
| | (argc + 2) | ((argc + 2) << 7)); |
| rbs = (unsigned long *) stack_start; |
| PUSH((long) ucp->uc_link); |
| PUSH(ELF_PTR_TO_FDESC (&__start_context)->gp); |
| va_start (ap, argc); |
| for (i = 0; i < argc; ++i) |
| PUSH(va_arg (ap, long)); |
| va_end (ap); |
| |
| /* set the memory and register stack pointers: */ |
| sc->sc_ar_bsp = (long) rbs; |
| sc->sc_gr[12] = stack_end - 16; |
| |
| /* clear the NaT bits for r1 and r12: */ |
| sc->sc_nat &= ~((1 << 1) | (1 << 12)); |
| sc->sc_ar_rnat = 0; |
| } |
| |
| weak_alias (__makecontext, makecontext) |