mirror of
git://git.sv.gnu.org/emacs.git
synced 2025-12-24 06:20:43 -08:00
108 lines
4.2 KiB
C
108 lines
4.2 KiB
C
/* ssixi6.c: UNIX/x64 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 code was branched from ssixi3.c (32-bit Intel) initially for the
|
||
* port to W3I6LL (Mac OS X on x86_64 with Clang).
|
||
*
|
||
* This code is common to more than one Unix implementation on
|
||
* Intel hardware (but is not portable Unix code). According to Wikipedia,
|
||
* all the non-Windows platforms use the System V AMD64 ABI. See
|
||
* .sources.callees.saves.
|
||
*
|
||
* SOURCES
|
||
*
|
||
* .sources.callees.saves:
|
||
* "Registers %rbp, %rbx and %r12 through %r15 "belong" to the calling
|
||
* function and the called function is required to preserve their values.
|
||
* In other words, a called function must preserve these registers’ values
|
||
* for its caller." -- System V AMD64 ABI
|
||
* <http://x86-64.org/documentation/abi.pdf>
|
||
*
|
||
* 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"
|
||
|
||
SRCID(ssixi6, "$Id$");
|
||
|
||
|
||
/* .assume.asm.order */
|
||
#define ASMV(x) __asm__ volatile (x)
|
||
|
||
|
||
Res StackScan(ScanState ss, Addr *stackBot)
|
||
{
|
||
Addr calleeSaveRegs[6];
|
||
|
||
/* .assume.asm.stack */
|
||
/* Store the callee save registers on the stack so they get scanned
|
||
* as they may contain roots.
|
||
*/
|
||
ASMV("mov %%rbp, %0" : "=m" (calleeSaveRegs[0]));
|
||
ASMV("mov %%rbx, %0" : "=m" (calleeSaveRegs[1]));
|
||
ASMV("mov %%r12, %0" : "=m" (calleeSaveRegs[2]));
|
||
ASMV("mov %%r13, %0" : "=m" (calleeSaveRegs[3]));
|
||
ASMV("mov %%r14, %0" : "=m" (calleeSaveRegs[4]));
|
||
ASMV("mov %%r15, %0" : "=m" (calleeSaveRegs[5]));
|
||
|
||
return StackScanInner(ss, stackBot, calleeSaveRegs, NELEMS(calleeSaveRegs));
|
||
}
|
||
|
||
|
||
/* 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.
|
||
*/
|