diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/ia64/makecontext.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/ia64/makecontext.c | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/ia64/makecontext.c b/sysdeps/unix/sysv/linux/ia64/makecontext.c new file mode 100644 index 0000000000..67ba3e0d6c --- /dev/null +++ b/sysdeps/unix/sysv/linux/ia64/makecontext.c @@ -0,0 +1,88 @@ +/* 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) |