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93 lines
3.6 KiB
C
93 lines
3.6 KiB
C
/* ssxci6.c: STACK SCANNING FOR OS X ON x86-64
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*
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* $Id$
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* Copyright (c) 2012-2014 Ravenbrook Limited. See end of file for license.
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*
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* This decodes the stack context and scans the registers which may
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* contain roots. See <design/ss/>.
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*/
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#include "mpm.h"
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SRCID(ssxci6, "$Id$");
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#if !defined(MPS_OS_XC) || !defined(MPS_ARCH_I6)
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#error "ssxci6.c is specific to MPS_OS_XC and MPS_ARCH_I6."
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#endif
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/* Offset of RSP in the jmp_buf in bytes, as defined in _setjmp.s.
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* See the implementation of _setjmp in
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* <http://www.opensource.apple.com/source/Libc/Libc-825.24/x86_64/sys/_setjmp.s> */
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#define JB_RSP 16
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/* StackContextStackTop -- return the "top" of the mutator's stack at
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* the point when the context was saved by STACK_CONTEXT_SAVE. */
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Addr *StackContextStackTop(StackContext sc)
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{
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Addr **p_rsp = PointerAdd(&(sc)->jumpBuffer, JB_RSP);
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return *p_rsp;
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}
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/* StackContextScan -- scan references in the stack context
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*
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* We conservatively scan the whole of the jump buffer, assuming that
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* all references are stored at aligned positions.
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*
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* The PointerAlignDown is necessary because the size of the jump
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* buffer is not a multiple of sizeof(Addr) on this platform: see
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* setjmp.h, where _JBLEN is 37.
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* <http://www.opensource.apple.com/source/Libc/Libc-825.24/include/setjmp.h>
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*/
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Res StackContextScan(ScanState ss, StackContext sc)
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{
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return TraceScanAreaTagged(ss, (void *)sc,
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PointerAlignDown(sc + 1, sizeof(Addr)));
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}
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/* C. COPYRIGHT AND LICENSE
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*
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* Copyright (C) 2012-2014 Ravenbrook Limited <http://www.ravenbrook.com/>.
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* All rights reserved. This is an open source license. Contact
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* Ravenbrook for commercial licensing options.
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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 distribution.
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*
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* 3. Redistributions in any form must be accompanied by information on how
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* to obtain complete source code for this software and any accompanying
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* software that uses this software. The source code must either be
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* included in the distribution or be available for no more than the cost
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* of distribution plus a nominal fee, and must be freely redistributable
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* under reasonable conditions. For an executable file, complete source
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* code means the source code for all modules it contains. It does not
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* include source code for modules or files that typically accompany the
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* major components of the operating system on which the executable file
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* runs.
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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, FITNESS FOR A PARTICULAR
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* PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY 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 OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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