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