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113 lines
3.4 KiB
C
113 lines
3.4 KiB
C
/* prmcix.c: MUTATOR CONTEXT (POSIX)
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*
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* $Id$
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* Copyright (c) 2016-2020 Ravenbrook Limited. See end of file for license.
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*
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* .purpose: Implement the mutator context module. <design/prmc>.
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*
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*
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* ASSUMPTIONS
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*
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* .context.regroots: The root registers are assumed to be recorded in
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* the context at pointer-aligned boundaries.
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*/
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#include "mpm.h"
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#if !defined(MPS_OS_FR) && !defined(MPS_OS_LI)
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#error "prmcix.c is specific to MPS_OS_FR or MPS_OS_LI"
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#endif
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#include "prmcix.h"
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SRCID(prmcix, "$Id$");
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Bool MutatorContextCheck(MutatorContext context)
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{
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CHECKS(MutatorContext, context);
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CHECKL(NONNEGATIVE(context->var));
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CHECKL(context->var < MutatorContextLIMIT);
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CHECKL((context->var == MutatorContextTHREAD) == (context->info == NULL));
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CHECKL(context->ucontext != NULL);
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return TRUE;
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}
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void MutatorContextInitFault(MutatorContext context, siginfo_t *info,
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ucontext_t *ucontext)
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{
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AVER(context != NULL);
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AVER(info != NULL);
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AVER(ucontext != NULL);
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context->var = MutatorContextFAULT;
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context->info = info;
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context->ucontext = ucontext;
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context->sig = MutatorContextSig;
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AVERT(MutatorContext, context);
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}
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void MutatorContextInitThread(MutatorContext context, ucontext_t *ucontext)
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{
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AVER(context != NULL);
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AVER(ucontext != NULL);
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context->var = MutatorContextTHREAD;
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context->info = NULL;
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context->ucontext = ucontext;
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context->sig = MutatorContextSig;
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AVERT(MutatorContext, context);
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}
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Res MutatorContextScan(ScanState ss, MutatorContext context,
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mps_area_scan_t scan_area, void *closure)
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{
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mcontext_t *mc;
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Res res;
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/* This scans the root registers (.context.regroots). It also
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unnecessarily scans the rest of the context. The optimisation
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to scan only relevant parts would be machine dependent. */
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mc = &context->ucontext->uc_mcontext;
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res = TraceScanArea(ss,
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(Word *)mc,
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(Word *)((char *)mc + sizeof(*mc)),
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scan_area, closure);
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return res;
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}
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/* C. COPYRIGHT AND LICENSE
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*
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* Copyright (C) 2016-2020 Ravenbrook Limited <http://www.ravenbrook.com/>.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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