91 lines
2.4 KiB
C++
91 lines
2.4 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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:(scenario call_disp32)
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% Reg[ESP].u = 0x64;
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== 0x1
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# op ModR/M SIB displacement immediate
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e8 a0 00 00 00 # call function offset at 0x000000a0
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# next EIP is 6
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+run: call imm32 0x000000a0
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+run: decrementing ESP to 0x00000060
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+run: pushing value 0x00000006
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+run: jumping to 0x000000a6
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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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trace(90, "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(90, "run") << "jumping to 0x" << HEXWORD << EIP << end();
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break;
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}
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//:
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:(scenario call_r32)
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% Reg[ESP].u = 0x64;
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% Reg[EBX].u = 0x000000a0;
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== 0x1
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# op ModR/M SIB displacement immediate
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ff d3 # call function offset at EBX
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# next EIP is 3
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+run: call to r/m32
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+run: r/m32 is EBX
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+run: decrementing ESP to 0x00000060
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+run: pushing value 0x00000003
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+run: jumping to 0x000000a3
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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(90, "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(90, "run") << "jumping to 0x" << HEXWORD << EIP << end();
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break;
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}
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:(scenario call_mem_at_r32)
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% Reg[ESP].u = 0x64;
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% Reg[EBX].u = 0x2000;
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== 0x1 # code segment
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# op ModR/M SIB displacement immediate
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ff 13 # call function offset at *EBX
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# next EIP is 3
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== 0x2000 # data segment
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a0 00 00 00 # 0xa0
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+run: call to r/m32
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+run: effective address is 0x00002000 (EBX)
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+run: decrementing ESP to 0x00000060
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+run: pushing value 0x00000003
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+run: jumping to 0x000000a3
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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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:(scenario ret)
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% Reg[ESP].u = 0x2000;
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== 0x1 # code segment
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# op ModR/M SIB displacement immediate
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c3
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== 0x2000 # data segment
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10 00 00 00 # 0x10
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+run: return
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+run: popping value 0x00000010
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+run: jumping to 0x00000010
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:(before "End Single-Byte Opcodes")
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case 0xc3: { // return from a call
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trace(90, "run") << "return" << end();
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EIP = pop();
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trace(90, "run") << "jumping to 0x" << HEXWORD << EIP << end();
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break;
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}
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