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Correcting design documentation relating to stacks. Referencing hot and cold end concepts from glossary entry for control stacks. Copied from Perforce Change: 189320 ServerID: perforce.ravenbrook.com
111 lines
4.4 KiB
C
111 lines
4.4 KiB
C
/* ssixi3.c: UNIX/INTEL STACK SCANNING
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*
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* $Id$
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* Copyright (c) 2001 Ravenbrook Limited. See end of file for license.
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*
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* This scans the stack and fixes the registers which may contain
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* roots. See <design/thread-manager/>
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*
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* This code was originally developed and tested on Linux, and then
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* copied to the FreeBSD and Darwin (OS X) operating systems where it
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* also seems to work. Note that on FreeBSD and Darwin it has not
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* been indepently verified with respect to any ABI documentation.
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*
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* This code is common to more than one Unix implementation on
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* Intel hardware (but is not portable Unix code).
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*
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* The registers edi, esi, ebx are the registers defined to be preserved
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* across function calls and therefore may contain roots.
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* These are pushed on the stack for scanning.
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*
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* SOURCES
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*
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* .source.callees.saves: Set of callee-saved registers taken from
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* CALL_USED_REGISTERS in <gcc-sources>/config/i386/i386.h.
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* ebp added to the list because gcc now doesn't always use it as
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* a frame pointer so it could contain a root.
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*
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* ASSUMPTIONS
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*
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* .assume.align: The stack pointer is assumed to be aligned on a word
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* boundary.
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*
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* .assume.asm.stack: The compiler must not do wacky things with the
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* stack pointer around a call since we need to ensure that the
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* callee-save regs are visible during TraceScanArea.
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*
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* .assume.asm.order: The volatile modifier should prevent movement
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* of code, which might break .assume.asm.stack.
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*
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*/
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#include "mpm.h"
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SRCID(ssixi3, "$Id$");
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/* .assume.asm.order */
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#define ASMV(x) __asm__ volatile (x)
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Res StackScan(ScanState ss, Word *stackCold,
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mps_area_scan_t scan_area,
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void *closure, size_t closure_size)
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{
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Word calleeSaveRegs[4];
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/* .assume.asm.stack */
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/* Store the callee save registers on the stack so they get scanned
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* as they may contain roots.
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*/
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ASMV("mov %%ebx, %0" : "=m" (calleeSaveRegs[0]));
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ASMV("mov %%esi, %0" : "=m" (calleeSaveRegs[1]));
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ASMV("mov %%edi, %0" : "=m" (calleeSaveRegs[2]));
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ASMV("mov %%ebp, %0" : "=m" (calleeSaveRegs[3]));
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return StackScanInner(ss, stackCold, calleeSaveRegs, NELEMS(calleeSaveRegs),
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scan_area, closure, closure_size);
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}
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/* C. COPYRIGHT AND LICENSE
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*
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* Copyright (C) 2001-2002 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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