Mercurial > hg > truffle
comparison src/os_cpu/solaris_sparc/vm/assembler_solaris_sparc.cpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | 1fdb98a17101 |
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-1:000000000000 | 0:a61af66fc99e |
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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); } |