123 lines
3.4 KiB
C++
123 lines
3.4 KiB
C++
//:: call
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:(before "End Initialize Op Names")
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put_new(Name, "e8", "call disp32 (call)");
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:(code)
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void test_call_disp32() {
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Mem.push_back(vma(0xbd000000)); // manually allocate memory
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Reg[ESP].u = 0xbd000064;
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run(
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"== code 0x1\n"
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// op ModR/M SIB displacement immediate
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" e8 a0 00 00 00 \n" // call function offset at 0x000000a0
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// next EIP is 6
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);
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CHECK_TRACE_CONTENTS(
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"run: call imm32 0x000000a0\n"
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"run: decrementing ESP to 0xbd000060\n"
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"run: pushing value 0x00000006\n"
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"run: jumping to 0x000000a6\n"
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);
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}
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:(before "End Single-Byte Opcodes")
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case 0xe8: { // call disp32 relative to next EIP
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const int32_t offset = next32();
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++Callstack_depth;
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trace(Callstack_depth+1, "run") << "call imm32 0x" << HEXWORD << offset << end();
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//? cerr << "push: EIP: " << EIP << " => " << Reg[ESP].u << '\n';
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push(EIP);
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EIP += offset;
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trace(Callstack_depth+1, "run") << "jumping to 0x" << HEXWORD << EIP << end();
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break;
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}
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//:
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:(code)
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void test_call_r32() {
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Mem.push_back(vma(0xbd000000)); // manually allocate memory
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Reg[ESP].u = 0xbd000064;
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Reg[EBX].u = 0x000000a0;
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run(
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"== code 0x1\n"
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// op ModR/M SIB displacement immediate
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" ff d3 \n" // call function offset at EBX
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// next EIP is 3
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);
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CHECK_TRACE_CONTENTS(
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"run: call to r/m32\n"
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"run: r/m32 is EBX\n"
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"run: decrementing ESP to 0xbd000060\n"
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"run: pushing value 0x00000003\n"
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"run: jumping to 0x000000a3\n"
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);
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}
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:(before "End Op ff Subops")
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case 2: { // call function pointer at r/m32
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trace(Callstack_depth+1, "run") << "call to r/m32" << end();
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const int32_t* offset = effective_address(modrm);
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push(EIP);
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EIP += *offset;
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trace(Callstack_depth+1, "run") << "jumping to 0x" << HEXWORD << EIP << end();
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++Callstack_depth;
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break;
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}
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:(code)
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void test_call_mem_at_r32() {
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Mem.push_back(vma(0xbd000000)); // manually allocate memory
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Reg[ESP].u = 0xbd000064;
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Reg[EBX].u = 0x2000;
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run(
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"== code 0x1\n"
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// op ModR/M SIB displacement immediate
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" ff 13 \n" // call function offset at *EBX
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// next EIP is 3
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"== data 0x2000\n"
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"a0 00 00 00\n" // 0x000000a0
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);
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CHECK_TRACE_CONTENTS(
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"run: call to r/m32\n"
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"run: effective address is 0x00002000 (EBX)\n"
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"run: decrementing ESP to 0xbd000060\n"
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"run: pushing value 0x00000003\n"
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"run: jumping to 0x000000a3\n"
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);
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}
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//:: ret
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:(before "End Initialize Op Names")
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put_new(Name, "c3", "return from most recent unfinished call (ret)");
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:(code)
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void test_ret() {
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Mem.push_back(vma(0xbd000000)); // manually allocate memory
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Reg[ESP].u = 0xbd000064;
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write_mem_u32(Reg[ESP].u, 0x10);
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run(
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"== code 0x1\n"
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// op ModR/M SIB displacement immediate
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" c3 \n" // return
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"== data 0x2000\n"
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"10 00 00 00\n" // 0x00000010
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);
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CHECK_TRACE_CONTENTS(
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"run: return\n"
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"run: popping value 0x00000010\n"
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"run: jumping to 0x00000010\n"
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);
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}
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:(before "End Single-Byte Opcodes")
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case 0xc3: { // return from a call
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trace(Callstack_depth+1, "run") << "return" << end();
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--Callstack_depth;
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EIP = pop();
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trace(Callstack_depth+1, "run") << "jumping to 0x" << HEXWORD << EIP << end();
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break;
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}
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