jdk8-mips64-public/hotspot: src/os_cpu/solaris_sparc/vm/assembler_solaris

     1 /*

     2  * Copyright 1999-2006 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    25 #include "incls/_precompiled.incl"

    26 #include "incls/_assembler_solaris_sparc.cpp.incl"

    28 #include <sys/trap.h>          // For trap numbers

    29 #include <v9/sys/psr_compat.h> // For V8 compatibility

    31 bool MacroAssembler::needs_explicit_null_check(intptr_t offset) {

    32   // The first page of virtual addresses is unmapped on SPARC.

    33   // Thus, any access the VM makes through a null pointer with an offset of

    34   // less than 4K will get a recognizable SIGSEGV, which the signal handler

    35   // will transform into a NullPointerException.

    36   // (Actually, the first 64K or so is unmapped, but it's simpler

    37   // to depend only on the first 4K or so.)

    39   bool offset_in_first_page = 0 <= offset && offset < os::vm_page_size();

    40   return !offset_in_first_page;

    41 }

    43 void MacroAssembler::read_ccr_trap(Register ccr_save) {

    44   // Execute a trap to get the PSR, mask and shift

    45   // to get the condition codes.

    46   get_psr_trap();

    47   nop();

    48   set(PSR_ICC, ccr_save);

    49   and3(O0, ccr_save, ccr_save);

    50   srl(ccr_save, PSR_ICC_SHIFT, ccr_save);

    51 }

    53 void MacroAssembler::write_ccr_trap(Register ccr_save, Register scratch1, Register scratch2) {

    54   // Execute a trap to get the PSR, shift back

    55   // the condition codes, mask the condition codes

    56   // back into and PSR and trap to write back the

    57   // PSR.

    58   sll(ccr_save, PSR_ICC_SHIFT, scratch2);

    59   get_psr_trap();

    60   nop();

    61   set(~PSR_ICC, scratch1);

    62   and3(O0, scratch1, O0);

    63   or3(O0, scratch2, O0);

    64   set_psr_trap();

    65   nop();

    66 }

    68 void MacroAssembler::flush_windows_trap() { trap(ST_FLUSH_WINDOWS); }

    69 void MacroAssembler::clean_windows_trap() { trap(ST_CLEAN_WINDOWS); }

    70 void MacroAssembler::get_psr_trap()       { trap(ST_GETPSR); }

    71 void MacroAssembler::set_psr_trap()       { trap(ST_SETPSR); }

src/os_cpu/solaris_sparc/vm/assembler_solaris_sparc.cpp@a61af66fc99e