mirror of
git://git.sv.gnu.org/emacs.git
synced 2025-12-24 14:30:43 -08:00
104 lines
4.1 KiB
C
104 lines
4.1 KiB
C
/* sssus8.c: SPARC STACK SCANNING
|
|
*
|
|
* $Id$
|
|
* Copyright (c) 2001 Ravenbrook Limited. See end of file for license.
|
|
* Portions copyright (c) 2002 Global Graphics Software.
|
|
*
|
|
* This scans the stack and fixes the registers which may contain
|
|
* roots. See <design/thread-manager/>.
|
|
*
|
|
* .roots: The non-global registers are preserved into the stackframe
|
|
* by the "ta 3" instruction. This leaves the global registers.
|
|
* According to the Sparc Architecture Manual:
|
|
* %g1 is assumed to be volatile across procedure calls
|
|
* %g2...%g4 are "reserved for use by application programmer"
|
|
* %g5...%g7 are "nonvolatile and reserved for (as-yet-undefined)
|
|
* use by the execution environment"
|
|
* To be safe %g2 to %g7 are pushed onto the stack before scanning
|
|
* it just in case.
|
|
*
|
|
* ASSUMPTIONS
|
|
*
|
|
* .assume.align: The stack pointer is assumed to be aligned on a word
|
|
* boundary.
|
|
*
|
|
* .assume.asm.stack: The compiler must not do wacky things with the
|
|
* stack pointer around a call since we need to ensure that the
|
|
* callee-save regs are visible during TraceScanArea.
|
|
*
|
|
* .assume.asm.order: The volatile modifier should prevent movement
|
|
* of code, which might break .assume.asm.stack.
|
|
*/
|
|
|
|
#include "mpm.h"
|
|
#include <alloca.h>
|
|
|
|
SRCID(sssus8, "$Id$");
|
|
|
|
|
|
/* .assume.asm.order */
|
|
#define ASMV(x) __asm__ volatile (x)
|
|
|
|
|
|
Res StackScan(ScanState ss, Addr *stackBot)
|
|
{
|
|
Addr *stackTop;
|
|
Res res;
|
|
void *globals;
|
|
|
|
/* We expect C will save the caller's window, but we don't really care, */
|
|
/* because it's bound to be an MPS window. */
|
|
globals = alloca(24); /* for 6 globals */
|
|
ASMV("std %%g2, [%0]" : : "r" (globals)); /* double stores */
|
|
ASMV("std %%g4, [%0 + 8]" : : "r" (globals));
|
|
ASMV("std %%g6, [%0 + 16]" : : "r" (globals));
|
|
ASMV("ta 3"); /* flushes register windows onto stack */
|
|
ASMV("mov %%sp, %0" : "=r" (stackTop)); /* stackTop = sp */
|
|
|
|
AVER(AddrIsAligned((Addr)stackTop, sizeof(Addr))); /* .assume.align */
|
|
res = TraceScanArea(ss, stackTop, stackBot);
|
|
|
|
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.
|
|
*/
|