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- /*
- * Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice, this
- * list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
- * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
- * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
- #include "Expression.h"
- #include <AK/Stream.h>
- #include <sys/arch/i386/regs.h>
- namespace Dwarf::Expression {
- Value evaluate(ReadonlyBytes bytes, const PtraceRegisters& regs)
- {
- InputMemoryStream stream(bytes);
- while (!stream.eof()) {
- u8 opcode = 0;
- stream >> opcode;
- switch (static_cast<Operations>(opcode)) {
- case Operations::RegEbp: {
- ssize_t offset = 0;
- stream.read_LEB128_signed(offset);
- return Value { Type::UnsignedIntetger, regs.ebp + offset };
- }
- case Operations::FbReg: {
- ssize_t offset = 0;
- stream.read_LEB128_signed(offset);
- return Value { Type::UnsignedIntetger, regs.ebp + 2 * sizeof(size_t) + offset };
- }
- default:
- dbg() << "DWARF expr addr: " << (const void*)bytes.data();
- dbg() << "unsupported opcode: " << (u8)opcode;
- ASSERT_NOT_REACHED();
- }
- }
- ASSERT_NOT_REACHED();
- }
- }
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