142 lines
4.9 KiB
C++
142 lines
4.9 KiB
C++
/*
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* Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef SHARE_VM_RUNTIME_ICACHE_HPP
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#define SHARE_VM_RUNTIME_ICACHE_HPP
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#include "memory/allocation.hpp"
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#include "runtime/stubCodeGenerator.hpp"
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// Interface for updating the instruction cache. Whenever the VM modifies
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// code, part of the processor instruction cache potentially has to be flushed.
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// Default implementation is in icache.cpp, and can be hidden per-platform.
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// Most platforms must provide only ICacheStubGenerator::generate_icache_flush().
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// Platforms that don't require icache flushing can just nullify the public
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// members of AbstractICache in their ICache class. AbstractICache should never
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// be referenced other than by deriving the ICache class from it.
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//
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// The code for the ICache class and for generate_icache_flush() must be in
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// architecture-specific files, i.e., icache_<arch>.hpp/.cpp
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class AbstractICache : AllStatic {
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public:
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// The flush stub signature
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typedef int (*flush_icache_stub_t)(address addr, int lines, int magic);
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protected:
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// The flush stub function address
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static flush_icache_stub_t _flush_icache_stub;
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// Call the flush stub
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static void call_flush_stub(address start, int lines);
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public:
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enum {
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stub_size = 0, // Size of the icache flush stub in bytes
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line_size = 0, // Icache line size in bytes
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log2_line_size = 0 // log2(line_size)
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};
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static void initialize();
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static void invalidate_word(address addr);
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static void invalidate_range(address start, int nbytes);
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};
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// Must be included before the definition of ICacheStubGenerator
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// because ICacheStubGenerator uses ICache definitions.
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#ifdef TARGET_ARCH_x86
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# include "icache_x86.hpp"
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#endif
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#ifdef TARGET_ARCH_sparc
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# include "icache_sparc.hpp"
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#endif
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#ifdef TARGET_ARCH_zero
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# include "icache_zero.hpp"
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#endif
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#ifdef TARGET_ARCH_arm
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# include "icache_arm.hpp"
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#endif
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#ifdef TARGET_ARCH_ppc
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# include "icache_ppc.hpp"
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#endif
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#ifdef TARGET_ARCH_aarch64
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# include "icache_aarch64.hpp"
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#endif
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class ICacheStubGenerator : public StubCodeGenerator {
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public:
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ICacheStubGenerator(CodeBuffer *c) : StubCodeGenerator(c) {}
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// Generate the icache flush stub.
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//
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// Since we cannot flush the cache when this stub is generated,
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// it must be generated first, and just to be sure, we do extra
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// work to allow a check that these instructions got executed.
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//
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// The flush stub has three parameters (see flush_icache_stub_t).
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//
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// addr - Start address, must be aligned at log2_line_size
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// lines - Number of line_size icache lines to flush
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// magic - Magic number copied to result register to make sure
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// the stub executed properly
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//
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// A template for generate_icache_flush is
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//
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// #define __ _masm->
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//
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// void ICacheStubGenerator::generate_icache_flush(
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// ICache::flush_icache_stub_t* flush_icache_stub
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// ) {
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// StubCodeMark mark(this, "ICache", "flush_icache_stub");
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//
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// address start = __ pc();
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//
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// // emit flush stub asm code
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//
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// // Must be set here so StubCodeMark destructor can call the flush stub.
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// *flush_icache_stub = (ICache::flush_icache_stub_t)start;
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// };
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//
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// #undef __
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//
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// The first use of flush_icache_stub must apply it to itself. The
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// StubCodeMark destructor in generate_icache_flush will call Assembler::flush,
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// which in turn will call invalidate_range (see asm/assembler.cpp), which
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// in turn will call the flush stub *before* generate_icache_flush returns.
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// The usual method of having generate_icache_flush return the address of the
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// stub to its caller, which would then, e.g., store that address in
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// flush_icache_stub, won't work. generate_icache_flush must itself set
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// flush_icache_stub to the address of the stub it generates before
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// the StubCodeMark destructor is invoked.
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void generate_icache_flush(ICache::flush_icache_stub_t* flush_icache_stub);
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};
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#endif // SHARE_VM_RUNTIME_ICACHE_HPP
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