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comparison: src/share/vm/runtime/icache.hpp
src/share/vm/runtime/icache.hpp
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| 1 /* | |
| 2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. | |
| 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
| 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 20 * or visit www.oracle.com if you need additional information or have any | |
| 21 * questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 #ifndef SHARE_VM_RUNTIME_ICACHE_HPP | |
| 26 #define SHARE_VM_RUNTIME_ICACHE_HPP | |
| 27 | |
| 28 #include "memory/allocation.hpp" | |
| 29 #include "runtime/stubCodeGenerator.hpp" | |
| 30 | |
| 31 // Interface for updating the instruction cache. Whenever the VM modifies | |
| 32 // code, part of the processor instruction cache potentially has to be flushed. | |
| 33 | |
| 34 // Default implementation is in icache.cpp, and can be hidden per-platform. | |
| 35 // Most platforms must provide only ICacheStubGenerator::generate_icache_flush(). | |
| 36 // Platforms that don't require icache flushing can just nullify the public | |
| 37 // members of AbstractICache in their ICache class. AbstractICache should never | |
| 38 // be referenced other than by deriving the ICache class from it. | |
| 39 // | |
| 40 // The code for the ICache class and for generate_icache_flush() must be in | |
| 41 // architecture-specific files, i.e., icache_<arch>.hpp/.cpp | |
| 42 | |
| 43 class AbstractICache : AllStatic { | |
| 44 public: | |
| 45 // The flush stub signature | |
| 46 typedef int (*flush_icache_stub_t)(address addr, int lines, int magic); | |
| 47 | |
| 48 protected: | |
| 49 // The flush stub function address | |
| 50 static flush_icache_stub_t _flush_icache_stub; | |
| 51 | |
| 52 // Call the flush stub | |
| 53 static void call_flush_stub(address start, int lines); | |
| 54 | |
| 55 public: | |
| 56 enum { | |
| 57 stub_size = 0, // Size of the icache flush stub in bytes | |
| 58 line_size = 0, // Icache line size in bytes | |
| 59 log2_line_size = 0 // log2(line_size) | |
| 60 }; | |
| 61 | |
| 62 static void initialize(); | |
| 63 static void invalidate_word(address addr); | |
| 64 static void invalidate_range(address start, int nbytes); | |
| 65 }; | |
| 66 | |
| 67 | |
| 68 // Must be included before the definition of ICacheStubGenerator | |
| 69 // because ICacheStubGenerator uses ICache definitions. | |
| 70 | |
| 71 #ifdef TARGET_ARCH_x86 | |
| 72 # include "icache_x86.hpp" | |
| 73 #endif | |
| 74 #ifdef TARGET_ARCH_sparc | |
| 75 # include "icache_sparc.hpp" | |
| 76 #endif | |
| 77 #ifdef TARGET_ARCH_zero | |
| 78 # include "icache_zero.hpp" | |
| 79 #endif | |
| 80 #ifdef TARGET_ARCH_arm | |
| 81 # include "icache_arm.hpp" | |
| 82 #endif | |
| 83 #ifdef TARGET_ARCH_ppc | |
| 84 # include "icache_ppc.hpp" | |
| 85 #endif | |
| 86 | |
| 87 | |
| 88 | |
| 89 class ICacheStubGenerator : public StubCodeGenerator { | |
| 90 public: | |
| 91 ICacheStubGenerator(CodeBuffer *c) : StubCodeGenerator(c) {} | |
| 92 | |
| 93 // Generate the icache flush stub. | |
| 94 // | |
| 95 // Since we cannot flush the cache when this stub is generated, | |
| 96 // it must be generated first, and just to be sure, we do extra | |
| 97 // work to allow a check that these instructions got executed. | |
| 98 // | |
| 99 // The flush stub has three parameters (see flush_icache_stub_t). | |
| 100 // | |
| 101 // addr - Start address, must be aligned at log2_line_size | |
| 102 // lines - Number of line_size icache lines to flush | |
| 103 // magic - Magic number copied to result register to make sure | |
| 104 // the stub executed properly | |
| 105 // | |
| 106 // A template for generate_icache_flush is | |
| 107 // | |
| 108 // #define __ _masm-> | |
| 109 // | |
| 110 // void ICacheStubGenerator::generate_icache_flush( | |
| 111 // ICache::flush_icache_stub_t* flush_icache_stub | |
| 112 // ) { | |
| 113 // StubCodeMark mark(this, "ICache", "flush_icache_stub"); | |
| 114 // | |
| 115 // address start = __ pc(); | |
| 116 // | |
| 117 // // emit flush stub asm code | |
| 118 // | |
| 119 // // Must be set here so StubCodeMark destructor can call the flush stub. | |
| 120 // *flush_icache_stub = (ICache::flush_icache_stub_t)start; | |
| 121 // }; | |
| 122 // | |
| 123 // #undef __ | |
| 124 // | |
| 125 // The first use of flush_icache_stub must apply it to itself. The | |
| 126 // StubCodeMark destructor in generate_icache_flush will call Assembler::flush, | |
| 127 // which in turn will call invalidate_range (see asm/assembler.cpp), which | |
| 128 // in turn will call the flush stub *before* generate_icache_flush returns. | |
| 129 // The usual method of having generate_icache_flush return the address of the | |
| 130 // stub to its caller, which would then, e.g., store that address in | |
| 131 // flush_icache_stub, won't work. generate_icache_flush must itself set | |
| 132 // flush_icache_stub to the address of the stub it generates before | |
| 133 // the StubCodeMark destructor is invoked. | |
| 134 | |
| 135 void generate_icache_flush(ICache::flush_icache_stub_t* flush_icache_stub); | |
| 136 }; | |
| 137 | |
| 138 #endif // SHARE_VM_RUNTIME_ICACHE_HPP |
