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Reverting to assembler method of saving callee-save registers for stack scan on w3i3mv to avoid c run-time dependency that breaks open dylan bootstrap.

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 Change: 179439
 ServerID: perforce.ravenbrook.com
This commit is contained in:
Richard Brooksby 2012-09-12 13:18:41 +01:00
parent c4d25ec6e6
commit a9bcf5293b
1 changed files with 76 additions and 20 deletions
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96
mps/code/ssw3i3mv.c
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@ -1,35 +1,91 @@
/* ssw3mv.c: STACK SCANNING FOR WIN32 WITH MICROSOFT C
/* ssw3i3.c: WIN32/INTEL STACK SCANNING
*
* $Id$
* Copyright (c) 2001 Ravenbrook Limited. See end of file for license.
*
* This scans the stack and fixes the registers which may contain roots.
* See <design/thread-manager/>.
* This scans the stack and fixes the registers which may contain
* roots. See <design/thread-manager/>.
*
* The registers edi, esi, ebx are the registers defined to be preserved
* across function calls and therefore may contain roots.
* These are pushed on the stack for scanning.
*
* ASSUMPTIONS
*
* .align: The stack pointer is assumed to be aligned on a word
* boundary.
*/
#include "mpm.h"
#include <setjmp.h>
SRCID(ssw3mv, "$Id$");
#include "mpm.h"
SRCID(ssw3i3, "$Id$");
Res StackScan(ScanState ss, Addr *stackBot)
{
jmp_buf jb;
Addr *stackTop;
Res res;
/* NOTE: We would like to use the same `setjmp` trick as ssw3i6mv.c here,
to avoid assembler, but this introduces a dependency on the C run-time
in Open Dylan on Windows, probably because of ancient build tools. So
I have reverted to the assembler method for now. RB 2012-09-12 */
/* We rely on the fact that Microsoft C's setjmp stores the callee-save
registers in the jmp_buf. */
(void)setjmp(jb);
__asm {
push edi /* these registers are the save registers */
push esi /* and so may contain roots. They are pushed */
push ebx /* for scanning */
mov stackTop, esp /* stack pointer */
}
res = StackScanInner(ss, stackBot, stackTop, 3);
/* These checks will just serve to warn us at compile-time if the
setjmp.h header changes to indicate that the registers we want aren't
saved any more. */
AVER(sizeof(((_JUMP_BUFFER *)jb)->Edi) == sizeof(Addr));
AVER(sizeof(((_JUMP_BUFFER *)jb)->Esi) == sizeof(Addr));
AVER(sizeof(((_JUMP_BUFFER *)jb)->Ebx) == sizeof(Addr));
__asm {
add esp, 0xc /* pop 3 registers to restore the stack pointer */
}
AVER(offsetof(_JUMP_BUFFER, Edi) == offsetof(_JUMP_BUFFER, Ebx) + 4);
AVER(offsetof(_JUMP_BUFFER, Esi) == offsetof(_JUMP_BUFFER, Ebx) + 8);
return StackScanInner(ss, stackBot, (Addr *)&((_JUMP_BUFFER *)jb)->Ebx, 3);
return res;
}
/* C. COPYRIGHT AND LICENSE
*
* Copyright (C) 2001-2002 Ravenbrook Limited <http://www.ravenbrook.com/>.
* All rights reserved. This is an open source license. Contact
* Ravenbrook for commercial licensing options.
*
* 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.
*
* 3. Redistributions in any form must be accompanied by information on how
* to obtain complete source code for this software and any accompanying
* software that uses this software. The source code must either be
* included in the distribution or be available for no more than the cost
* of distribution plus a nominal fee, and must be freely redistributable
* under reasonable conditions. For an executable file, complete source
* code means the source code for all modules it contains. It does not
* include source code for modules or files that typically accompany the
* major components of the operating system on which the executable file
* runs.
*
* 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, FITNESS FOR A PARTICULAR
* PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDERS AND 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.
*/