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comparison src/os_cpu/solaris_sparc/vm/assembler_solaris_sparc.cpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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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 */
24
25 #include "incls/_precompiled.incl"
26 #include "incls/_assembler_solaris_sparc.cpp.incl"
27
28 #include <sys/trap.h> // For trap numbers
29 #include <v9/sys/psr_compat.h> // For V8 compatibility
30
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.)
38
39 bool offset_in_first_page = 0 <= offset && offset < os::vm_page_size();
40 return !offset_in_first_page;
41 }
42
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 }
52
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 }
67
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); }