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 | /* |
xdono@772 | 2 | * Copyright 1999-2008 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 | |
duke@435 | 25 | #include "incls/_precompiled.incl" |
duke@435 | 26 | #include "incls/_assembler_solaris_sparc.cpp.incl" |
duke@435 | 27 | |
duke@435 | 28 | #include <sys/trap.h> // For trap numbers |
duke@435 | 29 | #include <v9/sys/psr_compat.h> // For V8 compatibility |
duke@435 | 30 | |
duke@435 | 31 | void MacroAssembler::read_ccr_trap(Register ccr_save) { |
duke@435 | 32 | // Execute a trap to get the PSR, mask and shift |
duke@435 | 33 | // to get the condition codes. |
duke@435 | 34 | get_psr_trap(); |
duke@435 | 35 | nop(); |
duke@435 | 36 | set(PSR_ICC, ccr_save); |
duke@435 | 37 | and3(O0, ccr_save, ccr_save); |
duke@435 | 38 | srl(ccr_save, PSR_ICC_SHIFT, ccr_save); |
duke@435 | 39 | } |
duke@435 | 40 | |
duke@435 | 41 | void MacroAssembler::write_ccr_trap(Register ccr_save, Register scratch1, Register scratch2) { |
duke@435 | 42 | // Execute a trap to get the PSR, shift back |
duke@435 | 43 | // the condition codes, mask the condition codes |
duke@435 | 44 | // back into and PSR and trap to write back the |
duke@435 | 45 | // PSR. |
duke@435 | 46 | sll(ccr_save, PSR_ICC_SHIFT, scratch2); |
duke@435 | 47 | get_psr_trap(); |
duke@435 | 48 | nop(); |
duke@435 | 49 | set(~PSR_ICC, scratch1); |
duke@435 | 50 | and3(O0, scratch1, O0); |
duke@435 | 51 | or3(O0, scratch2, O0); |
duke@435 | 52 | set_psr_trap(); |
duke@435 | 53 | nop(); |
duke@435 | 54 | } |
duke@435 | 55 | |
duke@435 | 56 | void MacroAssembler::flush_windows_trap() { trap(ST_FLUSH_WINDOWS); } |
duke@435 | 57 | void MacroAssembler::clean_windows_trap() { trap(ST_CLEAN_WINDOWS); } |
duke@435 | 58 | void MacroAssembler::get_psr_trap() { trap(ST_GETPSR); } |
duke@435 | 59 | void MacroAssembler::set_psr_trap() { trap(ST_SETPSR); } |