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1 /*
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2 * Copyright 1997-2005 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 inline void MacroAssembler::pd_patch_instruction(address branch, address target) {
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26 unsigned char op = branch[0];
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27 assert(op == 0xE8 /* call */ ||
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28 op == 0xE9 /* jmp */ ||
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29 op == 0xEB /* short jmp */ ||
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30 (op & 0xF0) == 0x70 /* short jcc */ ||
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31 op == 0x0F && (branch[1] & 0xF0) == 0x80 /* jcc */,
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32 "Invalid opcode at patch point");
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33
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34 if (op == 0xEB || (op & 0xF0) == 0x70) {
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35 // short offset operators (jmp and jcc)
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36 char* disp = (char*) &branch[1];
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37 int imm8 = target - (address) &disp[1];
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38 guarantee(this->is8bit(imm8), "Short forward jump exceeds 8-bit offset");
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39 *disp = imm8;
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40 } else {
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41 int* disp = (int*) &branch[(op == 0x0F)? 2: 1];
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42 int imm32 = target - (address) &disp[1];
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43 *disp = imm32;
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44 }
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45 }
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46
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47 #ifndef PRODUCT
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48 inline void MacroAssembler::pd_print_patched_instruction(address branch) {
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49 const char* s;
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50 unsigned char op = branch[0];
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51 if (op == 0xE8) {
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52 s = "call";
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53 } else if (op == 0xE9 || op == 0xEB) {
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54 s = "jmp";
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55 } else if ((op & 0xF0) == 0x70) {
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56 s = "jcc";
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57 } else if (op == 0x0F) {
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58 s = "jcc";
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59 } else {
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60 s = "????";
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61 }
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62 tty->print("%s (unresolved)", s);
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63 }
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64 #endif // ndef PRODUCT
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