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src/share/vm/runtime/icache.cpp@f90c822e73f8 (annotated)

src/share/vm/runtime/icache.cpp

Wed, 27 Apr 2016 01:25:04 +0800

author

aoqi

date

Wed, 27 Apr 2016 01:25:04 +0800

changeset 0

f90c822e73f8

child 6876

710a3c8b516e

permissions

-rw-r--r--

Initial load
http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*
aoqi@0	23	*/
aoqi@0	24
aoqi@0	25	#include "precompiled.hpp"
aoqi@0	26	#include "memory/resourceArea.hpp"
aoqi@0	27	#include "runtime/icache.hpp"
aoqi@0	28
aoqi@0	29	// The flush stub function address
aoqi@0	30	AbstractICache::flush_icache_stub_t AbstractICache::_flush_icache_stub = NULL;
aoqi@0	31
aoqi@0	32	void AbstractICache::initialize() {
aoqi@0	33	// Making this stub must be FIRST use of assembler
aoqi@0	34	ResourceMark rm;
aoqi@0	35
aoqi@0	36	BufferBlob* b = BufferBlob::create("flush_icache_stub", ICache::stub_size);
aoqi@0	37	CodeBuffer c(b);
aoqi@0	38
aoqi@0	39	ICacheStubGenerator g(&c);
aoqi@0	40	g.generate_icache_flush(&_flush_icache_stub);
aoqi@0	41
aoqi@0	42	// The first use of flush_icache_stub must apply it to itself.
aoqi@0	43	// The StubCodeMark destructor in generate_icache_flush will
aoqi@0	44	// call Assembler::flush, which in turn will call invalidate_range,
aoqi@0	45	// which will in turn call the flush stub. Thus we don't need an
aoqi@0	46	// explicit call to invalidate_range here. This assumption is
aoqi@0	47	// checked in invalidate_range.
aoqi@0	48	}
aoqi@0	49
aoqi@0	50	void AbstractICache::call_flush_stub(address start, int lines) {
aoqi@0	51	// The business with the magic number is just a little security.
aoqi@0	52	// We cannot call the flush stub when generating the flush stub
aoqi@0	53	// because it isn't there yet. So, the stub also returns its third
aoqi@0	54	// parameter. This is a cheap check that the stub was really executed.
aoqi@0	55	static int magic = 0xbaadbabe;
aoqi@0	56
aoqi@0	57	int auto_magic = magic; // Make a local copy to avoid race condition
aoqi@0	58	int r = (*_flush_icache_stub)(start, lines, auto_magic);
aoqi@0	59	guarantee(r == auto_magic, "flush stub routine did not execute");
aoqi@0	60	++magic;
aoqi@0	61	}
aoqi@0	62
aoqi@0	63	void AbstractICache::invalidate_word(address addr) {
aoqi@0	64	// Because this is called for instruction patching on the fly, long after
aoqi@0	65	// bootstrapping, we execute the stub directly. Account for a 4-byte word
aoqi@0	66	// spanning two cache lines by computing a start line address by rounding
aoqi@0	67	// addr down to a line_size boundary, and an end line address by adding
aoqi@0	68	// the word size - 1 and rounding the result down to a line_size boundary.
aoqi@0	69	// If we just added word size, we'd mistakenly flush the next cache line
aoqi@0	70	// if the word to be flushed started in the last 4 bytes of the line.
aoqi@0	71	// Doing that would segv if the next line weren't mapped.
aoqi@0	72
aoqi@0	73	const int word_size_in_bytes = 4; // Always, regardless of platform
aoqi@0	74
aoqi@0	75	intptr_t start_line = ((intptr_t)addr + 0) & ~(ICache::line_size - 1);
aoqi@0	76	intptr_t end_line = ((intptr_t)addr + word_size_in_bytes - 1)
aoqi@0	77	& ~(ICache::line_size - 1);
aoqi@0	78	(*_flush_icache_stub)((address)start_line, start_line == end_line ? 1 : 2, 0);
aoqi@0	79	}
aoqi@0	80
aoqi@0	81	void AbstractICache::invalidate_range(address start, int nbytes) {
aoqi@0	82	static bool firstTime = true;
aoqi@0	83	if (firstTime) {
aoqi@0	84	guarantee(start == CAST_FROM_FN_PTR(address, _flush_icache_stub),
aoqi@0	85	"first flush should be for flush stub");
aoqi@0	86	firstTime = false;
aoqi@0	87	return;
aoqi@0	88	}
aoqi@0	89	if (nbytes == 0) {
aoqi@0	90	return;
aoqi@0	91	}
aoqi@0	92	// Align start address to an icache line boundary and transform
aoqi@0	93	// nbytes to an icache line count.
aoqi@0	94	const uint line_offset = mask_address_bits(start, ICache::line_size-1);
aoqi@0	95	if (line_offset != 0) {
aoqi@0	96	start -= line_offset;
aoqi@0	97	nbytes += line_offset;
aoqi@0	98	}
aoqi@0	99	call_flush_stub(start, round_to(nbytes, ICache::line_size) >>
aoqi@0	100	ICache::log2_line_size);
aoqi@0	101	}
aoqi@0	102
aoqi@0	103	// For init.cpp
aoqi@0	104	void icache_init() {
aoqi@0	105	ICache::initialize();
aoqi@0	106	}