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@ -408,3 +408,23 @@ case 0x8f: { // pop stack into r/m32
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}
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break;
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}
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//:: special-case for loading address from disp32 rather than register
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:(scenario add_r32_to_mem_at_displacement)
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% Reg[3].i = 0x10; // source
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% SET_WORD_IN_MEM(0x60, 1);
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# op ModR/M SIB displacement immediate
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01 1d 60 00 00 00 # add EBX to *0x60
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# ModR/M in binary: 00 (indirect mode) 011 (src EBX) 101 (dest in disp32)
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+run: add EBX to r/m32
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+run: effective address is 0x60 (disp32)
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+run: storing 0x00000011
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:(before "End Mod 0 Special-cases")
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case 5: { // exception: mod 0b00 rm 0b101 => incoming disp32
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uint32_t addr = imm32();
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result = reinterpret_cast<int32_t*>(&Mem.at(addr));
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trace(2, "run") << "effective address is 0x" << std::hex << addr << " (disp32)" << end();
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break;
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}
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@ -63,8 +63,6 @@ uint32_t effective_address_from_sib(uint8_t mod) {
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:(scenario add_r32_to_mem_at_displacement_using_sib)
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% Reg[3].i = 0x10; // source
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% Reg[0].i = 0x5e; // dest base
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% Reg[1].i = 0x2; // dest index
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% SET_WORD_IN_MEM(0x60, 1);
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# op ModR/M SIB displacement immediate
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01 1c 25 60 00 00 00 # add EBX to *0x60
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@ -74,25 +72,3 @@ uint32_t effective_address_from_sib(uint8_t mod) {
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+run: effective address is initially 0x60 (disp32)
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+run: effective address is 0x60
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+run: storing 0x00000011
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//:
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:(scenario add_r32_to_mem_at_displacement)
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% Reg[3].i = 0x10; // source
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% Reg[0].i = 0x5e; // dest base
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% Reg[1].i = 0x2; // dest index
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% SET_WORD_IN_MEM(0x60, 1);
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# op ModR/M SIB displacement immediate
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01 1d 60 00 00 00 # add EBX to *0x60
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# ModR/M in binary: 00 (indirect mode) 011 (src EBX) 101 (dest in disp32)
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+run: add EBX to r/m32
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+run: effective address is 0x60 (disp32)
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+run: storing 0x00000011
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:(before "End Mod 0 Special-cases")
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case 5: { // exception: mod 0b00 rm 0b101 => incoming disp32
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uint32_t addr = imm32();
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result = reinterpret_cast<int32_t*>(&Mem.at(addr));
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trace(2, "run") << "effective address is 0x" << std::hex << addr << " (disp32)" << end();
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break;
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}
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