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src/os_cpu/linux_x86/vm/copy_linux_x86.inline.hpp@899ecf76b570
src/os_cpu/linux_x86/vm/copy_linux_x86.inline.hpp
Wed, 25 Sep 2013 13:58:13 +0200
- author
- dsimms
- date
- Wed, 25 Sep 2013 13:58:13 +0200
- changeset 5781
- 899ecf76b570
- parent 2314
- f95d63e2154a
- child 6876
- 710a3c8b516e
- child 8316
- 626f594dffa6
- permissions
- -rw-r--r--
8023956: Provide a work-around to broken Linux 32 bit "Exec Shield" using CS for NX emulation (crashing with SI_KERNEL)
Summary: Execute some code at a high virtual address value, and keep mapped
Reviewed-by: coleenp, zgu
1 /*
2 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #ifndef OS_CPU_LINUX_X86_VM_COPY_LINUX_X86_INLINE_HPP
26 #define OS_CPU_LINUX_X86_VM_COPY_LINUX_X86_INLINE_HPP
28 static void pd_conjoint_words(HeapWord* from, HeapWord* to, size_t count) {
29 #ifdef AMD64
30 (void)memmove(to, from, count * HeapWordSize);
31 #else
32 // Includes a zero-count check.
33 intx temp;
34 __asm__ volatile(" testl %6,%6 ;"
35 " jz 7f ;"
36 " cmpl %4,%5 ;"
37 " leal -4(%4,%6,4),%3;"
38 " jbe 1f ;"
39 " cmpl %7,%5 ;"
40 " jbe 4f ;"
41 "1: cmpl $32,%6 ;"
42 " ja 3f ;"
43 " subl %4,%1 ;"
44 "2: movl (%4),%3 ;"
45 " movl %7,(%5,%4,1) ;"
46 " addl $4,%0 ;"
47 " subl $1,%2 ;"
48 " jnz 2b ;"
49 " jmp 7f ;"
50 "3: rep; smovl ;"
51 " jmp 7f ;"
52 "4: cmpl $32,%2 ;"
53 " movl %7,%0 ;"
54 " leal -4(%5,%6,4),%1;"
55 " ja 6f ;"
56 " subl %4,%1 ;"
57 "5: movl (%4),%3 ;"
58 " movl %7,(%5,%4,1) ;"
59 " subl $4,%0 ;"
60 " subl $1,%2 ;"
61 " jnz 5b ;"
62 " jmp 7f ;"
63 "6: std ;"
64 " rep; smovl ;"
65 " cld ;"
66 "7: nop "
67 : "=S" (from), "=D" (to), "=c" (count), "=r" (temp)
68 : "0" (from), "1" (to), "2" (count), "3" (temp)
69 : "memory", "flags");
70 #endif // AMD64
71 }
73 static void pd_disjoint_words(HeapWord* from, HeapWord* to, size_t count) {
74 #ifdef AMD64
75 switch (count) {
76 case 8: to[7] = from[7];
77 case 7: to[6] = from[6];
78 case 6: to[5] = from[5];
79 case 5: to[4] = from[4];
80 case 4: to[3] = from[3];
81 case 3: to[2] = from[2];
82 case 2: to[1] = from[1];
83 case 1: to[0] = from[0];
84 case 0: break;
85 default:
86 (void)memcpy(to, from, count * HeapWordSize);
87 break;
88 }
89 #else
90 // Includes a zero-count check.
91 intx temp;
92 __asm__ volatile(" testl %6,%6 ;"
93 " jz 3f ;"
94 " cmpl $32,%6 ;"
95 " ja 2f ;"
96 " subl %4,%1 ;"
97 "1: movl (%4),%3 ;"
98 " movl %7,(%5,%4,1);"
99 " addl $4,%0 ;"
100 " subl $1,%2 ;"
101 " jnz 1b ;"
102 " jmp 3f ;"
103 "2: rep; smovl ;"
104 "3: nop "
105 : "=S" (from), "=D" (to), "=c" (count), "=r" (temp)
106 : "0" (from), "1" (to), "2" (count), "3" (temp)
107 : "memory", "cc");
108 #endif // AMD64
109 }
111 static void pd_disjoint_words_atomic(HeapWord* from, HeapWord* to, size_t count) {
112 #ifdef AMD64
113 switch (count) {
114 case 8: to[7] = from[7];
115 case 7: to[6] = from[6];
116 case 6: to[5] = from[5];
117 case 5: to[4] = from[4];
118 case 4: to[3] = from[3];
119 case 3: to[2] = from[2];
120 case 2: to[1] = from[1];
121 case 1: to[0] = from[0];
122 case 0: break;
123 default:
124 while (count-- > 0) {
125 *to++ = *from++;
126 }
127 break;
128 }
129 #else
130 // pd_disjoint_words is word-atomic in this implementation.
131 pd_disjoint_words(from, to, count);
132 #endif // AMD64
133 }
135 static void pd_aligned_conjoint_words(HeapWord* from, HeapWord* to, size_t count) {
136 pd_conjoint_words(from, to, count);
137 }
139 static void pd_aligned_disjoint_words(HeapWord* from, HeapWord* to, size_t count) {
140 pd_disjoint_words(from, to, count);
141 }
143 static void pd_conjoint_bytes(void* from, void* to, size_t count) {
144 #ifdef AMD64
145 (void)memmove(to, from, count);
146 #else
147 // Includes a zero-count check.
148 intx temp;
149 __asm__ volatile(" testl %6,%6 ;"
150 " jz 13f ;"
151 " cmpl %4,%5 ;"
152 " leal -1(%4,%6),%3 ;"
153 " jbe 1f ;"
154 " cmpl %7,%5 ;"
155 " jbe 8f ;"
156 "1: cmpl $3,%6 ;"
157 " jbe 6f ;"
158 " movl %6,%3 ;"
159 " movl $4,%2 ;"
160 " subl %4,%2 ;"
161 " andl $3,%2 ;"
162 " jz 2f ;"
163 " subl %6,%3 ;"
164 " rep; smovb ;"
165 "2: movl %7,%2 ;"
166 " shrl $2,%2 ;"
167 " jz 5f ;"
168 " cmpl $32,%2 ;"
169 " ja 4f ;"
170 " subl %4,%1 ;"
171 "3: movl (%4),%%edx ;"
172 " movl %%edx,(%5,%4,1);"
173 " addl $4,%0 ;"
174 " subl $1,%2 ;"
175 " jnz 3b ;"
176 " addl %4,%1 ;"
177 " jmp 5f ;"
178 "4: rep; smovl ;"
179 "5: movl %7,%2 ;"
180 " andl $3,%2 ;"
181 " jz 13f ;"
182 "6: xorl %7,%3 ;"
183 "7: movb (%4,%7,1),%%dl ;"
184 " movb %%dl,(%5,%7,1) ;"
185 " addl $1,%3 ;"
186 " subl $1,%2 ;"
187 " jnz 7b ;"
188 " jmp 13f ;"
189 "8: std ;"
190 " cmpl $12,%2 ;"
191 " ja 9f ;"
192 " movl %7,%0 ;"
193 " leal -1(%6,%5),%1 ;"
194 " jmp 11f ;"
195 "9: xchgl %3,%2 ;"
196 " movl %6,%0 ;"
197 " addl $1,%2 ;"
198 " leal -1(%7,%5),%1 ;"
199 " andl $3,%2 ;"
200 " jz 10f ;"
201 " subl %6,%3 ;"
202 " rep; smovb ;"
203 "10: movl %7,%2 ;"
204 " subl $3,%0 ;"
205 " shrl $2,%2 ;"
206 " subl $3,%1 ;"
207 " rep; smovl ;"
208 " andl $3,%3 ;"
209 " jz 12f ;"
210 " movl %7,%2 ;"
211 " addl $3,%0 ;"
212 " addl $3,%1 ;"
213 "11: rep; smovb ;"
214 "12: cld ;"
215 "13: nop ;"
216 : "=S" (from), "=D" (to), "=c" (count), "=r" (temp)
217 : "0" (from), "1" (to), "2" (count), "3" (temp)
218 : "memory", "flags", "%edx");
219 #endif // AMD64
220 }
222 static void pd_conjoint_bytes_atomic(void* from, void* to, size_t count) {
223 pd_conjoint_bytes(from, to, count);
224 }
226 static void pd_conjoint_jshorts_atomic(jshort* from, jshort* to, size_t count) {
227 _Copy_conjoint_jshorts_atomic(from, to, count);
228 }
230 static void pd_conjoint_jints_atomic(jint* from, jint* to, size_t count) {
231 #ifdef AMD64
232 _Copy_conjoint_jints_atomic(from, to, count);
233 #else
234 assert(HeapWordSize == BytesPerInt, "heapwords and jints must be the same size");
235 // pd_conjoint_words is word-atomic in this implementation.
236 pd_conjoint_words((HeapWord*)from, (HeapWord*)to, count);
237 #endif // AMD64
238 }
240 static void pd_conjoint_jlongs_atomic(jlong* from, jlong* to, size_t count) {
241 #ifdef AMD64
242 _Copy_conjoint_jlongs_atomic(from, to, count);
243 #else
244 // Guarantee use of fild/fistp or xmm regs via some asm code, because compilers won't.
245 if (from > to) {
246 while (count-- > 0) {
247 __asm__ volatile("fildll (%0); fistpll (%1)"
248 :
249 : "r" (from), "r" (to)
250 : "memory" );
251 ++from;
252 ++to;
253 }
254 } else {
255 while (count-- > 0) {
256 __asm__ volatile("fildll (%0,%2,8); fistpll (%1,%2,8)"
257 :
258 : "r" (from), "r" (to), "r" (count)
259 : "memory" );
260 }
261 }
262 #endif // AMD64
263 }
265 static void pd_conjoint_oops_atomic(oop* from, oop* to, size_t count) {
266 #ifdef AMD64
267 assert(BytesPerLong == BytesPerOop, "jlongs and oops must be the same size");
268 _Copy_conjoint_jlongs_atomic((jlong*)from, (jlong*)to, count);
269 #else
270 assert(HeapWordSize == BytesPerOop, "heapwords and oops must be the same size");
271 // pd_conjoint_words is word-atomic in this implementation.
272 pd_conjoint_words((HeapWord*)from, (HeapWord*)to, count);
273 #endif // AMD64
274 }
276 static void pd_arrayof_conjoint_bytes(HeapWord* from, HeapWord* to, size_t count) {
277 _Copy_arrayof_conjoint_bytes(from, to, count);
278 }
280 static void pd_arrayof_conjoint_jshorts(HeapWord* from, HeapWord* to, size_t count) {
281 _Copy_arrayof_conjoint_jshorts(from, to, count);
282 }
284 static void pd_arrayof_conjoint_jints(HeapWord* from, HeapWord* to, size_t count) {
285 #ifdef AMD64
286 _Copy_arrayof_conjoint_jints(from, to, count);
287 #else
288 pd_conjoint_jints_atomic((jint*)from, (jint*)to, count);
289 #endif // AMD64
290 }
292 static void pd_arrayof_conjoint_jlongs(HeapWord* from, HeapWord* to, size_t count) {
293 #ifdef AMD64
294 _Copy_arrayof_conjoint_jlongs(from, to, count);
295 #else
296 pd_conjoint_jlongs_atomic((jlong*)from, (jlong*)to, count);
297 #endif // AMD64
298 }
300 static void pd_arrayof_conjoint_oops(HeapWord* from, HeapWord* to, size_t count) {
301 #ifdef AMD64
302 assert(BytesPerLong == BytesPerOop, "jlongs and oops must be the same size");
303 _Copy_arrayof_conjoint_jlongs(from, to, count);
304 #else
305 pd_conjoint_oops_atomic((oop*)from, (oop*)to, count);
306 #endif // AMD64
307 }
309 #endif // OS_CPU_LINUX_X86_VM_COPY_LINUX_X86_INLINE_HPP
