Thu, 26 Mar 2009 14:31:45 -0700
6822204: volatile fences should prefer lock:addl to actual mfence instructions
Reviewed-by: kvn, phh
duke@435 | 1 | /* |
duke@435 | 2 | * Copyright 1998-2007 Sun Microsystems, Inc. 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 | * |
duke@435 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
duke@435 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
duke@435 | 21 | * have any questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | private: |
duke@435 | 25 | |
duke@435 | 26 | void pd_initialize() { |
duke@435 | 27 | _anchor.clear(); |
duke@435 | 28 | _base_of_stack_pointer = NULL; |
duke@435 | 29 | } |
duke@435 | 30 | |
duke@435 | 31 | frame pd_last_frame() { |
duke@435 | 32 | assert(has_last_Java_frame(), "must have last_Java_sp() when suspended"); |
duke@435 | 33 | assert(_anchor.walkable(), "thread has not dumped its register windows yet"); |
duke@435 | 34 | |
duke@435 | 35 | assert(_anchor.last_Java_pc() != NULL, "Ack no pc!"); |
duke@435 | 36 | return frame(last_Java_sp(), frame::unpatchable, _anchor.last_Java_pc()); |
duke@435 | 37 | } |
duke@435 | 38 | |
duke@435 | 39 | // Sometimes the trap handler needs to record both PC and NPC. |
duke@435 | 40 | // This is a SPARC-specific companion to Thread::set_saved_exception_pc. |
duke@435 | 41 | address _saved_exception_npc; |
duke@435 | 42 | |
duke@435 | 43 | // In polling_page_safepoint_handler_blob(s) we have to tail call other |
duke@435 | 44 | // blobs without blowing any registers. A tail call requires some |
duke@435 | 45 | // register to jump with and we can't blow any registers, so it must |
duke@435 | 46 | // be restored in the delay slot. 'restore' cannot be used as it |
duke@435 | 47 | // will chop the heads off of 64-bit %o registers in the 32-bit |
duke@435 | 48 | // build. Instead we reload the registers using G2_thread and this |
duke@435 | 49 | // location. Must be 64bits in the 32-bit LION build. |
duke@435 | 50 | jdouble _o_reg_temps[6]; |
duke@435 | 51 | |
duke@435 | 52 | // a stack pointer older than any java frame stack pointer. It is |
duke@435 | 53 | // used to validate stack pointers in frame::next_younger_sp (it |
duke@435 | 54 | // provides the upper bound in the range check). This is necessary |
duke@435 | 55 | // on Solaris/SPARC since the ucontext passed to a signal handler is |
duke@435 | 56 | // sometimes corrupt and we need a way to check the extracted sp. |
duke@435 | 57 | intptr_t* _base_of_stack_pointer; |
duke@435 | 58 | |
duke@435 | 59 | public: |
duke@435 | 60 | |
duke@435 | 61 | static int o_reg_temps_offset_in_bytes() { return offset_of(JavaThread, _o_reg_temps); } |
duke@435 | 62 | |
duke@435 | 63 | #ifndef _LP64 |
duke@435 | 64 | address o_reg_temps(int i) { return (address)&_o_reg_temps[i]; } |
duke@435 | 65 | #endif |
duke@435 | 66 | |
duke@435 | 67 | static int saved_exception_npc_offset_in_bytes() { return offset_of(JavaThread,_saved_exception_npc); } |
duke@435 | 68 | |
duke@435 | 69 | address saved_exception_npc() { return _saved_exception_npc; } |
duke@435 | 70 | void set_saved_exception_npc(address a) { _saved_exception_npc = a; } |
duke@435 | 71 | |
duke@435 | 72 | |
duke@435 | 73 | public: |
duke@435 | 74 | |
duke@435 | 75 | intptr_t* base_of_stack_pointer() { return _base_of_stack_pointer; } |
duke@435 | 76 | |
duke@435 | 77 | void set_base_of_stack_pointer(intptr_t* base_sp) { |
duke@435 | 78 | _base_of_stack_pointer = base_sp; |
duke@435 | 79 | } |
duke@435 | 80 | |
duke@435 | 81 | void record_base_of_stack_pointer() { |
duke@435 | 82 | intptr_t *sp = (intptr_t *)(((intptr_t)StubRoutines::Sparc::flush_callers_register_windows_func()())); |
duke@435 | 83 | intptr_t *ysp; |
duke@435 | 84 | while((ysp = (intptr_t*)sp[FP->sp_offset_in_saved_window()]) != NULL) { |
duke@435 | 85 | sp = (intptr_t *)((intptr_t)ysp + STACK_BIAS); |
duke@435 | 86 | } |
duke@435 | 87 | _base_of_stack_pointer = sp; |
duke@435 | 88 | } |
duke@435 | 89 | |
duke@435 | 90 | bool pd_get_top_frame_for_signal_handler(frame* fr_addr, void* ucontext, |
duke@435 | 91 | bool isInJava); |
duke@435 | 92 | |
duke@435 | 93 | // These routines are only used on cpu architectures that |
duke@435 | 94 | // have separate register stacks (Itanium). |
duke@435 | 95 | static bool register_stack_overflow() { return false; } |
duke@435 | 96 | static void enable_register_stack_guard() {} |
duke@435 | 97 | static void disable_register_stack_guard() {} |