Mercurial > hg > graal-compiler
diff src/share/vm/runtime/icache.cpp @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/runtime/icache.cpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,105 @@ +/* + * Copyright 1997-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +#include "incls/_precompiled.incl" +#include "incls/_icache.cpp.incl" + +// The flush stub function address +AbstractICache::flush_icache_stub_t AbstractICache::_flush_icache_stub = NULL; + +void AbstractICache::initialize() { + // Making this stub must be FIRST use of assembler + ResourceMark rm; + + BufferBlob* b = BufferBlob::create("flush_icache_stub", ICache::stub_size); + CodeBuffer c(b->instructions_begin(), b->instructions_size()); + + ICacheStubGenerator g(&c); + g.generate_icache_flush(&_flush_icache_stub); + + // 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, + // which will in turn call the flush stub. Thus we don't need an + // explicit call to invalidate_range here. This assumption is + // checked in invalidate_range. +} + +void AbstractICache::call_flush_stub(address start, int lines) { + // The business with the magic number is just a little security. + // We cannot call the flush stub when generating the flush stub + // because it isn't there yet. So, the stub also returns its third + // parameter. This is a cheap check that the stub was really executed. + static int magic = 0xbaadbabe; + + int auto_magic = magic; // Make a local copy to avoid race condition + int r = (*_flush_icache_stub)(start, lines, auto_magic); + guarantee(r == auto_magic, "flush stub routine did not execute"); + ++magic; +} + +void AbstractICache::invalidate_word(address addr) { + // Because this is called for instruction patching on the fly, long after + // bootstrapping, we execute the stub directly. Account for a 4-byte word + // spanning two cache lines by computing a start line address by rounding + // addr down to a line_size boundary, and an end line address by adding + // the word size - 1 and rounding the result down to a line_size boundary. + // If we just added word size, we'd mistakenly flush the next cache line + // if the word to be flushed started in the last 4 bytes of the line. + // Doing that would segv if the next line weren't mapped. + + const int word_size_in_bytes = 4; // Always, regardless of platform + + intptr_t start_line = ((intptr_t)addr + 0) & ~(ICache::line_size - 1); + intptr_t end_line = ((intptr_t)addr + word_size_in_bytes - 1) + & ~(ICache::line_size - 1); + (*_flush_icache_stub)((address)start_line, start_line == end_line ? 1 : 2, 0); +} + +void AbstractICache::invalidate_range(address start, int nbytes) { + static bool firstTime = true; + if (firstTime) { + guarantee(start == CAST_FROM_FN_PTR(address, _flush_icache_stub), + "first flush should be for flush stub"); + firstTime = false; + return; + } + if (nbytes == 0) { + return; + } + // Align start address to an icache line boundary and transform + // nbytes to an icache line count. + const uint line_offset = mask_address_bits(start, ICache::line_size-1); + if (line_offset != 0) { + start -= line_offset; + nbytes += line_offset; + } + call_flush_stub(start, round_to(nbytes, ICache::line_size) >> + ICache::log2_line_size); +} + +// For init.cpp +void icache_init() { + ICache::initialize(); +}