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src/share/vm/runtime/icache.cpp@d2ede61b7a12 (annotated)

src/share/vm/runtime/icache.cpp

Wed, 11 Aug 2010 05:51:21 -0700

author

twisti

date

Wed, 11 Aug 2010 05:51:21 -0700

changeset 2047

d2ede61b7a12

parent 1907

c18cbe5936b8

child 2103

3e8fbc61cee8

permissions

-rw-r--r--

6976186: integrate Shark HotSpot changes
Summary: Shark is a JIT compiler for Zero that uses the LLVM compiler infrastructure.
Reviewed-by: kvn, twisti
Contributed-by: Gary Benson <gbenson@redhat.com>

duke@435	1	/*
trims@1907	2	* Copyright (c) 1997, 2006, Oracle and/or its affiliates. All rights reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	#include "incls/_precompiled.incl"
duke@435	26	#include "incls/_icache.cpp.incl"
duke@435	27
duke@435	28	// The flush stub function address
duke@435	29	AbstractICache::flush_icache_stub_t AbstractICache::_flush_icache_stub = NULL;
duke@435	30
duke@435	31	void AbstractICache::initialize() {
duke@435	32	// Making this stub must be FIRST use of assembler
duke@435	33	ResourceMark rm;
duke@435	34
duke@435	35	BufferBlob* b = BufferBlob::create("flush_icache_stub", ICache::stub_size);
duke@435	36	CodeBuffer c(b->instructions_begin(), b->instructions_size());
duke@435	37
duke@435	38	ICacheStubGenerator g(&c);
duke@435	39	g.generate_icache_flush(&_flush_icache_stub);
duke@435	40
duke@435	41	// The first use of flush_icache_stub must apply it to itself.
duke@435	42	// The StubCodeMark destructor in generate_icache_flush will
duke@435	43	// call Assembler::flush, which in turn will call invalidate_range,
duke@435	44	// which will in turn call the flush stub. Thus we don't need an
duke@435	45	// explicit call to invalidate_range here. This assumption is
duke@435	46	// checked in invalidate_range.
duke@435	47	}
duke@435	48
duke@435	49	void AbstractICache::call_flush_stub(address start, int lines) {
duke@435	50	// The business with the magic number is just a little security.
duke@435	51	// We cannot call the flush stub when generating the flush stub
duke@435	52	// because it isn't there yet. So, the stub also returns its third
duke@435	53	// parameter. This is a cheap check that the stub was really executed.
duke@435	54	static int magic = 0xbaadbabe;
duke@435	55
duke@435	56	int auto_magic = magic; // Make a local copy to avoid race condition
duke@435	57	int r = (*_flush_icache_stub)(start, lines, auto_magic);
duke@435	58	guarantee(r == auto_magic, "flush stub routine did not execute");
duke@435	59	++magic;
duke@435	60	}
duke@435	61
duke@435	62	void AbstractICache::invalidate_word(address addr) {
duke@435	63	// Because this is called for instruction patching on the fly, long after
duke@435	64	// bootstrapping, we execute the stub directly. Account for a 4-byte word
duke@435	65	// spanning two cache lines by computing a start line address by rounding
duke@435	66	// addr down to a line_size boundary, and an end line address by adding
duke@435	67	// the word size - 1 and rounding the result down to a line_size boundary.
duke@435	68	// If we just added word size, we'd mistakenly flush the next cache line
duke@435	69	// if the word to be flushed started in the last 4 bytes of the line.
duke@435	70	// Doing that would segv if the next line weren't mapped.
duke@435	71
duke@435	72	const int word_size_in_bytes = 4; // Always, regardless of platform
duke@435	73
duke@435	74	intptr_t start_line = ((intptr_t)addr + 0) & ~(ICache::line_size - 1);
duke@435	75	intptr_t end_line = ((intptr_t)addr + word_size_in_bytes - 1)
duke@435	76	& ~(ICache::line_size - 1);
duke@435	77	(*_flush_icache_stub)((address)start_line, start_line == end_line ? 1 : 2, 0);
duke@435	78	}
duke@435	79
duke@435	80	void AbstractICache::invalidate_range(address start, int nbytes) {
duke@435	81	static bool firstTime = true;
duke@435	82	if (firstTime) {
duke@435	83	guarantee(start == CAST_FROM_FN_PTR(address, _flush_icache_stub),
duke@435	84	"first flush should be for flush stub");
duke@435	85	firstTime = false;
duke@435	86	return;
duke@435	87	}
duke@435	88	if (nbytes == 0) {
duke@435	89	return;
duke@435	90	}
duke@435	91	// Align start address to an icache line boundary and transform
duke@435	92	// nbytes to an icache line count.
duke@435	93	const uint line_offset = mask_address_bits(start, ICache::line_size-1);
duke@435	94	if (line_offset != 0) {
duke@435	95	start -= line_offset;
duke@435	96	nbytes += line_offset;
duke@435	97	}
duke@435	98	call_flush_stub(start, round_to(nbytes, ICache::line_size) >>
duke@435	99	ICache::log2_line_size);
duke@435	100	}
duke@435	101
duke@435	102	// For init.cpp
duke@435	103	void icache_init() {
duke@435	104	ICache::initialize();
duke@435	105	}