assembler_x86.inline.hpp revision 337:9ee9cf798b59 
1/*
2 * Copyright 1997-2008 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
25inline 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
48inline 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
65
66#ifndef _LP64
67inline int Assembler::prefix_and_encode(int reg_enc, bool byteinst) { return reg_enc; }
68inline int Assembler::prefixq_and_encode(int reg_enc) { return reg_enc; }
69
70inline int Assembler::prefix_and_encode(int dst_enc, int src_enc, bool byteinst) { return dst_enc << 3 | src_enc; }
71inline int Assembler::prefixq_and_encode(int dst_enc, int src_enc) { return dst_enc << 3 | src_enc; }
72
73inline void Assembler::prefix(Register reg) {}
74inline void Assembler::prefix(Address adr) {}
75inline void Assembler::prefixq(Address adr) {}
76
77inline void Assembler::prefix(Address adr, Register reg,  bool byteinst) {}
78inline void Assembler::prefixq(Address adr, Register reg) {}
79
80inline void Assembler::prefix(Address adr, XMMRegister reg) {}
81#else
82inline void Assembler::emit_long64(jlong x) {
83  *(jlong*) _code_pos = x;
84  _code_pos += sizeof(jlong);
85  code_section()->set_end(_code_pos);
86}
87#endif // _LP64
88