annotate src/os_cpu/solaris_sparc/vm/assembler_solaris_sparc.cpp @ 0:a61af66fc99e

Initial load
author duke
date Sat, 01 Dec 2007 00:00:00 +0000
parents
children 1fdb98a17101
rev   line source
duke@0 1 /*
duke@0 2 * Copyright 1999-2006 Sun Microsystems, Inc. All Rights Reserved.
duke@0 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@0 4 *
duke@0 5 * This code is free software; you can redistribute it and/or modify it
duke@0 6 * under the terms of the GNU General Public License version 2 only, as
duke@0 7 * published by the Free Software Foundation.
duke@0 8 *
duke@0 9 * This code is distributed in the hope that it will be useful, but WITHOUT
duke@0 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@0 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@0 12 * version 2 for more details (a copy is included in the LICENSE file that
duke@0 13 * accompanied this code).
duke@0 14 *
duke@0 15 * You should have received a copy of the GNU General Public License version
duke@0 16 * 2 along with this work; if not, write to the Free Software Foundation,
duke@0 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@0 18 *
duke@0 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@0 20 * CA 95054 USA or visit www.sun.com if you need additional information or
duke@0 21 * have any questions.
duke@0 22 *
duke@0 23 */
duke@0 24
duke@0 25 #include "incls/_precompiled.incl"
duke@0 26 #include "incls/_assembler_solaris_sparc.cpp.incl"
duke@0 27
duke@0 28 #include <sys/trap.h> // For trap numbers
duke@0 29 #include <v9/sys/psr_compat.h> // For V8 compatibility
duke@0 30
duke@0 31 bool MacroAssembler::needs_explicit_null_check(intptr_t offset) {
duke@0 32 // The first page of virtual addresses is unmapped on SPARC.
duke@0 33 // Thus, any access the VM makes through a null pointer with an offset of
duke@0 34 // less than 4K will get a recognizable SIGSEGV, which the signal handler
duke@0 35 // will transform into a NullPointerException.
duke@0 36 // (Actually, the first 64K or so is unmapped, but it's simpler
duke@0 37 // to depend only on the first 4K or so.)
duke@0 38
duke@0 39 bool offset_in_first_page = 0 <= offset && offset < os::vm_page_size();
duke@0 40 return !offset_in_first_page;
duke@0 41 }
duke@0 42
duke@0 43 void MacroAssembler::read_ccr_trap(Register ccr_save) {
duke@0 44 // Execute a trap to get the PSR, mask and shift
duke@0 45 // to get the condition codes.
duke@0 46 get_psr_trap();
duke@0 47 nop();
duke@0 48 set(PSR_ICC, ccr_save);
duke@0 49 and3(O0, ccr_save, ccr_save);
duke@0 50 srl(ccr_save, PSR_ICC_SHIFT, ccr_save);
duke@0 51 }
duke@0 52
duke@0 53 void MacroAssembler::write_ccr_trap(Register ccr_save, Register scratch1, Register scratch2) {
duke@0 54 // Execute a trap to get the PSR, shift back
duke@0 55 // the condition codes, mask the condition codes
duke@0 56 // back into and PSR and trap to write back the
duke@0 57 // PSR.
duke@0 58 sll(ccr_save, PSR_ICC_SHIFT, scratch2);
duke@0 59 get_psr_trap();
duke@0 60 nop();
duke@0 61 set(~PSR_ICC, scratch1);
duke@0 62 and3(O0, scratch1, O0);
duke@0 63 or3(O0, scratch2, O0);
duke@0 64 set_psr_trap();
duke@0 65 nop();
duke@0 66 }
duke@0 67
duke@0 68 void MacroAssembler::flush_windows_trap() { trap(ST_FLUSH_WINDOWS); }
duke@0 69 void MacroAssembler::clean_windows_trap() { trap(ST_CLEAN_WINDOWS); }
duke@0 70 void MacroAssembler::get_psr_trap() { trap(ST_GETPSR); }
duke@0 71 void MacroAssembler::set_psr_trap() { trap(ST_SETPSR); }