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src/os_cpu/solaris_x86/vm/threadLS_solaris_x86.cpp@9b8ce46870df (annotated)

src/os_cpu/solaris_x86/vm/threadLS_solaris_x86.cpp

Thu, 16 Feb 2012 17:12:49 -0800

author

kvn

date

Thu, 16 Feb 2012 17:12:49 -0800

changeset 3577

9b8ce46870df

parent 2314

f95d63e2154a

child 4299

f34d701e952e

permissions

-rw-r--r--

7145346: VerifyStackAtCalls is broken
Summary: Replace call_epilog() encoding with macroassembler use. Moved duplicated code to x86.ad. Fixed return_addr() definition.
Reviewed-by: never

duke@435	1	/*
stefank@2314	2	* Copyright (c) 1998, 2010, 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
stefank@2314	25	#include "precompiled.hpp"
stefank@2314	26	#include "runtime/threadLocalStorage.hpp"
stefank@2314	27	#include "thread_solaris.inline.hpp"
duke@435	28
duke@435	29	#ifdef AMD64
duke@435	30	extern "C" Thread* fs_load(ptrdiff_t tlsOffset);
duke@435	31	extern "C" intptr_t fs_thread();
duke@435	32	#else
duke@435	33	// From solaris_i486.s
duke@435	34	extern "C" Thread* gs_load(ptrdiff_t tlsOffset);
duke@435	35	extern "C" intptr_t gs_thread();
duke@435	36	#endif // AMD64
duke@435	37
duke@435	38	// tlsMode encoding:
duke@435	39	//
duke@435	40	// pd_tlsAccessUndefined : uninitialized
duke@435	41	// pd_tlsAccessSlow : not available
duke@435	42	// pd_tlsAccessIndirect :
duke@435	43	// old-style indirect access - present in "T1" libthread.
duke@435	44	// use thr_slot_sync_allocate() to attempt to allocate a slot.
duke@435	45	// pd_tlsAccessDirect :
duke@435	46	// new-style direct access - present in late-model "T2" libthread.
duke@435	47	// Allocate the offset (slot) via _thr_slot_offset() or by
duke@435	48	// defining an IE- or LE-mode TLS/TSD slot in the launcher and then passing
duke@435	49	// that offset into libjvm.so.
duke@435	50	// See http://sac.eng/Archives/CaseLog/arc/PSARC/2003/159/.
duke@435	51	//
duke@435	52	// Note that we have a capability gap - some early model T2 forms
duke@435	53	// (e.g., unpatched S9) have neither _thr_slot_sync_allocate() nor
duke@435	54	// _thr_slot_offset(). In that case we revert to the usual
duke@435	55	// thr_getspecific accessor.
duke@435	56	//
duke@435	57
duke@435	58	static ThreadLocalStorage::pd_tlsAccessMode tlsMode = ThreadLocalStorage::pd_tlsAccessUndefined ;
duke@435	59	static ptrdiff_t tlsOffset = 0 ;
duke@435	60	static thread_key_t tlsKey ;
duke@435	61
duke@435	62	typedef int (*TSSA_Entry) (ptrdiff_t *, int, int) ;
duke@435	63	typedef ptrdiff_t (*TSO_Entry) (int) ;
duke@435	64
duke@435	65	ThreadLocalStorage::pd_tlsAccessMode ThreadLocalStorage::pd_getTlsAccessMode ()
duke@435	66	{
duke@435	67	guarantee (tlsMode != pd_tlsAccessUndefined, "tlsMode not set") ;
duke@435	68	return tlsMode ;
duke@435	69	}
duke@435	70
duke@435	71	ptrdiff_t ThreadLocalStorage::pd_getTlsOffset () {
duke@435	72	guarantee (tlsMode != pd_tlsAccessUndefined, "tlsMode not set") ;
duke@435	73	return tlsOffset ;
duke@435	74	}
duke@435	75
duke@435	76	// TODO: Consider the following improvements:
duke@435	77	//
duke@435	78	// 1. Convert from thr_*specific* to pthread_*specific*.
duke@435	79	// The pthread_ forms are slightly faster. Also, the
duke@435	80	// pthread_ forms have a pthread_key_delete() API which
duke@435	81	// would aid in clean JVM shutdown and the eventual goal
duke@435	82	// of permitting a JVM to reinstantiate itself withing a process.
duke@435	83	//
duke@435	84	// 2. See ThreadLocalStorage::init(). We end up allocating
duke@435	85	// two TLS keys during VM startup. That's benign, but we could collapse
duke@435	86	// down to one key without too much trouble.
duke@435	87	//
duke@435	88	// 3. MacroAssembler::get_thread() currently emits calls to thr_getspecific().
duke@435	89	// Modify get_thread() to call Thread::current() instead.
duke@435	90	//
duke@435	91	// 4. Thread::current() currently uses a cache keyed by %gs:[0].
duke@435	92	// (The JVM has PSARC permission to use %g7/%gs:[0]
duke@435	93	// as an opaque temporally unique thread identifier).
duke@435	94	// For C++ access to a thread's reflexive "self" pointer we
duke@435	95	// should consider using one of the following:
duke@435	96	// a. a radix tree keyed by %esp - as in EVM.
duke@435	97	// This requires two loads (the 2nd dependent on the 1st), but
duke@435	98	// is easily inlined and doesn't require a "miss" slow path.
duke@435	99	// b. a fast TLS/TSD slot allocated by _thr_slot_offset
duke@435	100	// or _thr_slot_sync_allocate.
duke@435	101	//
duke@435	102	// 5. 'generate_code_for_get_thread' is a misnomer.
duke@435	103	// We should change it to something more general like
duke@435	104	// pd_ThreadSelf_Init(), for instance.
duke@435	105	//
duke@435	106
duke@435	107	static void AllocateTLSOffset ()
duke@435	108	{
duke@435	109	int rslt ;
duke@435	110	TSSA_Entry tssa ;
duke@435	111	TSO_Entry tso ;
duke@435	112	ptrdiff_t off ;
duke@435	113
duke@435	114	guarantee (tlsMode == ThreadLocalStorage::pd_tlsAccessUndefined, "tlsMode not set") ;
duke@435	115	tlsMode = ThreadLocalStorage::pd_tlsAccessSlow ;
duke@435	116	tlsOffset = 0 ;
duke@435	117	#ifndef AMD64
duke@435	118
duke@435	119	tssa = (TSSA_Entry) dlsym (RTLD_DEFAULT, "thr_slot_sync_allocate") ;
duke@435	120	if (tssa != NULL) {
duke@435	121	off = -1 ;
duke@435	122	rslt = (*tssa)(&off, NULL, NULL) ; // (off,dtor,darg)
duke@435	123	if (off != -1) {
duke@435	124	tlsOffset = off ;
duke@435	125	tlsMode = ThreadLocalStorage::pd_tlsAccessIndirect ;
duke@435	126	return ;
duke@435	127	}
duke@435	128	}
duke@435	129
duke@435	130	rslt = thr_keycreate (&tlsKey, NULL) ;
duke@435	131	if (rslt != 0) {
duke@435	132	tlsMode = ThreadLocalStorage::pd_tlsAccessSlow ; // revert to slow mode
duke@435	133	return ;
duke@435	134	}
duke@435	135
duke@435	136	tso = (TSO_Entry) dlsym (RTLD_DEFAULT, "_thr_slot_offset") ;
duke@435	137	if (tso != NULL) {
duke@435	138	off = (*tso)(tlsKey) ;
duke@435	139	if (off >= 0) {
duke@435	140	tlsOffset = off ;
duke@435	141	tlsMode = ThreadLocalStorage::pd_tlsAccessDirect ;
duke@435	142	return ;
duke@435	143	}
duke@435	144	}
duke@435	145
duke@435	146	// Failure: Too bad ... we've allocated a TLS slot we don't need and there's
duke@435	147	// no provision in the ABI for returning the slot.
duke@435	148	//
duke@435	149	// If we didn't find a slot then then:
duke@435	150	// 1. We might be on liblwp.
duke@435	151	// 2. We might be on T2 libthread, but all "fast" slots are already
duke@435	152	// consumed
duke@435	153	// 3. We might be on T1, and all TSD (thr_slot_sync_allocate) slots are
duke@435	154	// consumed.
duke@435	155	// 4. We might be on T2 libthread, but it's be re-architected
duke@435	156	// so that fast slots are no longer g7-relative.
duke@435	157	//
duke@435	158
duke@435	159	tlsMode = ThreadLocalStorage::pd_tlsAccessSlow ;
duke@435	160	return ;
duke@435	161	#endif // AMD64
duke@435	162	}
duke@435	163
duke@435	164	void ThreadLocalStorage::generate_code_for_get_thread() {
duke@435	165	AllocateTLSOffset() ;
duke@435	166	}
duke@435	167
duke@435	168	void ThreadLocalStorage::set_thread_in_slot(Thread *thread) {
duke@435	169	guarantee (tlsMode != pd_tlsAccessUndefined, "tlsMode not set") ;
duke@435	170	if (tlsMode == pd_tlsAccessIndirect) {
duke@435	171	#ifdef AMD64
duke@435	172	intptr_t tbase = fs_thread();
duke@435	173	#else
duke@435	174	intptr_t tbase = gs_thread();
duke@435	175	#endif // AMD64
duke@435	176	*((Thread**) (tbase + tlsOffset)) = thread ;
duke@435	177	} else
duke@435	178	if (tlsMode == pd_tlsAccessDirect) {
duke@435	179	thr_setspecific (tlsKey, (void *) thread) ;
duke@435	180	// set with thr_setspecific and then readback with gs_load to validate.
duke@435	181	#ifdef AMD64
duke@435	182	guarantee (thread == fs_load(tlsOffset), "tls readback failure") ;
duke@435	183	#else
duke@435	184	guarantee (thread == gs_load(tlsOffset), "tls readback failure") ;
duke@435	185	#endif // AMD64
duke@435	186	}
duke@435	187	}
duke@435	188
duke@435	189
duke@435	190	extern "C" Thread* get_thread() {
duke@435	191	return ThreadLocalStorage::thread();
duke@435	192	}