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comparison src/cpu/x86/vm/assembler_x86_32.inline.hpp @ 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 1997-2005 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 inline void MacroAssembler::pd_patch_instruction(address branch, address target) {
26 unsigned char op = branch[0];
27 assert(op == 0xE8 /* call */ ||
28 op == 0xE9 /* jmp */ ||
29 op == 0xEB /* short jmp */ ||
30 (op & 0xF0) == 0x70 /* short jcc */ ||
31 op == 0x0F && (branch[1] & 0xF0) == 0x80 /* jcc */,
32 "Invalid opcode at patch point");
33
34 if (op == 0xEB || (op & 0xF0) == 0x70) {
35 // short offset operators (jmp and jcc)
36 char* disp = (char*) &branch[1];
37 int imm8 = target - (address) &disp[1];
38 guarantee(this->is8bit(imm8), "Short forward jump exceeds 8-bit offset");
39 *disp = imm8;
40 } else {
41 int* disp = (int*) &branch[(op == 0x0F)? 2: 1];
42 int imm32 = target - (address) &disp[1];
43 *disp = imm32;
44 }
45 }
46
47 #ifndef PRODUCT
48 inline void MacroAssembler::pd_print_patched_instruction(address branch) {
49 const char* s;
50 unsigned char op = branch[0];
51 if (op == 0xE8) {
52 s = "call";
53 } else if (op == 0xE9 || op == 0xEB) {
54 s = "jmp";
55 } else if ((op & 0xF0) == 0x70) {
56 s = "jcc";
57 } else if (op == 0x0F) {
58 s = "jcc";
59 } else {
60 s = "????";
61 }
62 tty->print("%s (unresolved)", s);
63 }
64 #endif // ndef PRODUCT