/* prmcix.c: MUTATOR CONTEXT (POSIX)
*
* $Id: //info.ravenbrook.com/project/mps/master/code/prmcix.c#9 $
* Copyright (c) 2016-2020 Ravenbrook Limited. See end of file for license.
*
* .purpose: Implement the mutator context module. <design/prmc>.
*
*
* ASSUMPTIONS
*
* .context.regroots: The root registers are assumed to be recorded in
* the context at pointer-aligned boundaries.
*/
#include "mpm.h"
#if !defined(MPS_OS_FR) && !defined(MPS_OS_LI)
#error "prmcix.c is specific to MPS_OS_FR or MPS_OS_LI"
#endif
#include "prmcix.h"
SRCID(prmcix, "$Id: //info.ravenbrook.com/project/mps/master/code/prmcix.c#9 $");
Bool MutatorContextCheck(MutatorContext context)
{
CHECKS(MutatorContext, context);
CHECKL(NONNEGATIVE(context->var));
CHECKL(context->var < MutatorContextLIMIT);
CHECKL((context->var == MutatorContextTHREAD) == (context->info == NULL));
CHECKL(context->ucontext != NULL);
return TRUE;
}
void MutatorContextInitFault(MutatorContext context, siginfo_t *info,
ucontext_t *ucontext)
{
AVER(context != NULL);
AVER(info != NULL);
AVER(ucontext != NULL);
context->var = MutatorContextFAULT;
context->info = info;
context->ucontext = ucontext;
context->sig = MutatorContextSig;
AVERT(MutatorContext, context);
}
void MutatorContextInitThread(MutatorContext context, ucontext_t *ucontext)
{
AVER(context != NULL);
AVER(ucontext != NULL);
context->var = MutatorContextTHREAD;
context->info = NULL;
context->ucontext = ucontext;
context->sig = MutatorContextSig;
AVERT(MutatorContext, context);
}
Res MutatorContextScan(ScanState ss, MutatorContext context,
mps_area_scan_t scan_area, void *closure)
{
mcontext_t *mc;
Res res;
/* This scans the root registers (.context.regroots). It also
unnecessarily scans the rest of the context. The optimisation
to scan only relevant parts would be machine dependent. */
mc = &context->ucontext->uc_mcontext;
res = TraceScanArea(ss,
(Word *)mc,
(Word *)((char *)mc + sizeof(*mc)),
scan_area, closure);
return res;
}
/* C. COPYRIGHT AND LICENSE
*
* Copyright (C) 2016-2020 Ravenbrook Limited <https://www.ravenbrook.com/>.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/