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89 lines
2.6 KiB
C
89 lines
2.6 KiB
C
/* Copyright (C) 2001-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by David Mosberger-Tang <davidm@hpl.hp.com>.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <libintl.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <ucontext.h>
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#include <sys/rse.h>
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#include <link.h>
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#include <dl-fptr.h>
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#define PUSH(val) \
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do { \
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if (ia64_rse_is_rnat_slot (rbs)) \
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*rbs++ = 0; \
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*rbs++ = (val); \
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} while (0)
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/* This implementation can handle an ARGC value of at most 8 and
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values can be passed only in integer registers (r32-r39). */
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void
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__makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...)
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{
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struct sigcontext *sc = &ucp->uc_mcontext;
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extern void __start_context (ucontext_t *link, long gp, ...);
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unsigned long stack_start, stack_end;
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va_list ap;
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unsigned long *rbs;
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int i;
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stack_start = (long) sc->sc_stack.ss_sp;
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stack_end = (long) sc->sc_stack.ss_sp + sc->sc_stack.ss_size;
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stack_start = (stack_start + 7) & -8;
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stack_end = stack_end & -16;
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if (argc > 8)
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{
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fprintf (stderr, _("\
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makecontext: does not know how to handle more than 8 arguments\n"));
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exit (-1);
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}
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/* set the entry point and global pointer: */
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sc->sc_br[0] = ELF_PTR_TO_FDESC (&__start_context)->ip;
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sc->sc_br[1] = ELF_PTR_TO_FDESC (func)->ip;
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sc->sc_gr[1] = ELF_PTR_TO_FDESC (func)->gp;
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/* set up the call frame: */
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sc->sc_ar_pfs = ((sc->sc_ar_pfs & ~0x3fffffffffUL)
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| (argc + 2) | ((argc + 2) << 7));
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rbs = (unsigned long *) stack_start;
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PUSH((long) ucp->uc_link);
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PUSH(ELF_PTR_TO_FDESC (&__start_context)->gp);
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va_start (ap, argc);
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for (i = 0; i < argc; ++i)
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PUSH(va_arg (ap, long));
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va_end (ap);
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/* set the memory and register stack pointers: */
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sc->sc_ar_bsp = (long) rbs;
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sc->sc_gr[12] = stack_end - 16;
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/* clear the NaT bits for r1 and r12: */
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sc->sc_nat &= ~((1 << 1) | (1 << 12));
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sc->sc_ar_rnat = 0;
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}
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weak_alias (__makecontext, makecontext)
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