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/*
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* Copyright 1997-2005 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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inline void MacroAssembler::pd_patch_instruction(address branch, address target) {
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unsigned char op = branch[0];
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assert(op == 0xE8 /* call */ ||
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op == 0xE9 /* jmp */ ||
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op == 0xEB /* short jmp */ ||
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(op & 0xF0) == 0x70 /* short jcc */ ||
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op == 0x0F && (branch[1] & 0xF0) == 0x80 /* jcc */,
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"Invalid opcode at patch point");
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if (op == 0xEB || (op & 0xF0) == 0x70) {
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// short offset operators (jmp and jcc)
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char* disp = (char*) &branch[1];
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int imm8 = target - (address) &disp[1];
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guarantee(this->is8bit(imm8), "Short forward jump exceeds 8-bit offset");
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*disp = imm8;
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} else {
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int* disp = (int*) &branch[(op == 0x0F)? 2: 1];
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int imm32 = target - (address) &disp[1];
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*disp = imm32;
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}
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}
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#ifndef PRODUCT
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inline void MacroAssembler::pd_print_patched_instruction(address branch) {
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const char* s;
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unsigned char op = branch[0];
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if (op == 0xE8) {
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s = "call";
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} else if (op == 0xE9 || op == 0xEB) {
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s = "jmp";
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} else if ((op & 0xF0) == 0x70) {
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s = "jcc";
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} else if (op == 0x0F) {
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s = "jcc";
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} else {
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s = "????";
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}
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tty->print("%s (unresolved)", s);
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}
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#endif // ndef PRODUCT
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