294 lines
7.6 KiB
C++
294 lines
7.6 KiB
C++
//: jump to 16-bit offset
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//:: jump
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:(before "End Initialize Op Names(name)")
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put(name, "e9", "jump disp16 bytes away");
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:(scenario jump_rel16)
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== 0x1
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# op ModR/M SIB displacement immediate
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e9 05 00 # skip 1 instruction
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05 00 00 00 01
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05 00 00 00 02
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+run: inst: 0x00000001
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+run: jump 5
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+run: inst: 0x00000009
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-run: inst: 0x00000003
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:(before "End Single-Byte Opcodes")
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case 0xe9: { // jump rel8
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const int16_t offset = imm16();
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trace(90, "run") << "jump " << offset << end();
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EIP += offset;
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break;
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}
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:(code)
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int16_t imm16() {
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int16_t result = next();
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result |= (next()<<8);
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return result;
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}
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//:: jump if equal/zero
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:(before "End Initialize Op Names(name)")
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put(name_0f, "84", "jump disp16 bytes away if ZF is set");
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:(scenario je_rel16_success)
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% ZF = true;
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== 0x1
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# op ModR/M SIB displacement immediate
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0f 84 05 00 # skip 1 instruction
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05 00 00 00 01
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05 00 00 00 02
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+run: inst: 0x00000001
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+run: jump 5
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+run: inst: 0x0000000a
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-run: inst: 0x00000005
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:(before "End Two-Byte Opcodes Starting With 0f")
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case 0x84: { // jump rel16 if ZF
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const int8_t offset = imm16();
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if (ZF) {
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trace(90, "run") << "jump " << NUM(offset) << end();
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EIP += offset;
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}
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break;
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}
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:(scenario je_rel16_fail)
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% ZF = false;
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== 0x1
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# op ModR/M SIB displacement immediate
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0f 84 05 00 # skip 1 instruction
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05 00 00 00 01
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05 00 00 00 02
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+run: inst: 0x00000001
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+run: inst: 0x00000005
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+run: inst: 0x0000000a
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-run: jump 5
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//:: jump if not equal/not zero
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:(before "End Initialize Op Names(name)")
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put(name_0f, "85", "jump disp16 bytes away if ZF is not set");
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:(scenario jne_rel16_success)
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% ZF = false;
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== 0x1
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# op ModR/M SIB displacement immediate
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0f 85 05 00 # skip 1 instruction
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05 00 00 00 01
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05 00 00 00 02
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+run: inst: 0x00000001
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+run: jump 5
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+run: inst: 0x0000000a
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-run: inst: 0x00000005
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:(before "End Two-Byte Opcodes Starting With 0f")
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case 0x85: { // jump rel16 unless ZF
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const int8_t offset = imm16();
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if (!ZF) {
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trace(90, "run") << "jump " << NUM(offset) << end();
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EIP += offset;
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}
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break;
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}
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:(scenario jne_rel16_fail)
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% ZF = true;
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== 0x1
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# op ModR/M SIB displacement immediate
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0f 85 05 00 # skip 1 instruction
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05 00 00 00 01
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05 00 00 00 02
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+run: inst: 0x00000001
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+run: inst: 0x00000005
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+run: inst: 0x0000000a
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-run: jump 5
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//:: jump if greater
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:(before "End Initialize Op Names(name)")
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put(name_0f, "8f", "jump disp16 bytes away if greater (ZF is unset, SF == OF)");
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:(scenario jg_rel16_success)
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% ZF = false;
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% SF = false;
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% OF = false;
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== 0x1
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# op ModR/M SIB displacement immediate
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0f 8f 05 00 # skip 1 instruction
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05 00 00 00 01
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05 00 00 00 02
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+run: inst: 0x00000001
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+run: jump 5
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+run: inst: 0x0000000a
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-run: inst: 0x00000005
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:(before "End Two-Byte Opcodes Starting With 0f")
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case 0x8f: { // jump rel16 if !SF and !ZF
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const int8_t offset = imm16();
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if (!ZF && SF == OF) {
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trace(90, "run") << "jump " << NUM(offset) << end();
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EIP += offset;
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}
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break;
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}
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:(scenario jg_rel16_fail)
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% ZF = false;
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% SF = true;
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% OF = false;
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== 0x1
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# op ModR/M SIB displacement immediate
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0f 8f 05 00 # skip 1 instruction
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05 00 00 00 01
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05 00 00 00 02
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+run: inst: 0x00000001
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+run: inst: 0x00000005
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+run: inst: 0x0000000a
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-run: jump 5
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//:: jump if greater or equal
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:(before "End Initialize Op Names(name)")
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put(name_0f, "8d", "jump disp16 bytes away if greater or equal (SF == OF)");
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:(scenario jge_rel16_success)
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% SF = false;
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% OF = false;
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== 0x1
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# op ModR/M SIB displacement immediate
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0f 8d 05 00 # skip 1 instruction
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05 00 00 00 01
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05 00 00 00 02
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+run: inst: 0x00000001
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+run: jump 5
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+run: inst: 0x0000000a
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-run: inst: 0x00000005
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:(before "End Two-Byte Opcodes Starting With 0f")
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case 0x8d: { // jump rel16 if !SF
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const int8_t offset = imm16();
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if (SF == OF) {
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trace(90, "run") << "jump " << NUM(offset) << end();
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EIP += offset;
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}
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break;
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}
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:(scenario jge_rel16_fail)
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% SF = true;
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% OF = false;
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== 0x1
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# op ModR/M SIB displacement immediate
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0f 8d 05 00 # skip 1 instruction
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05 00 00 00 01
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05 00 00 00 02
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+run: inst: 0x00000001
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+run: inst: 0x00000005
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+run: inst: 0x0000000a
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-run: jump 5
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//:: jump if lesser
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:(before "End Initialize Op Names(name)")
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put(name_0f, "8c", "jump disp16 bytes away if lesser (SF != OF)");
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:(scenario jl_rel16_success)
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% ZF = false;
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% SF = true;
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% OF = false;
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== 0x1
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# op ModR/M SIB displacement immediate
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0f 8c 05 00 # skip 1 instruction
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05 00 00 00 01
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05 00 00 00 02
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+run: inst: 0x00000001
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+run: jump 5
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+run: inst: 0x0000000a
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-run: inst: 0x00000005
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:(before "End Two-Byte Opcodes Starting With 0f")
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case 0x8c: { // jump rel16 if SF and !ZF
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const int8_t offset = imm16();
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if (SF != OF) {
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trace(90, "run") << "jump " << NUM(offset) << end();
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EIP += offset;
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}
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break;
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}
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:(scenario jl_rel16_fail)
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% ZF = false;
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% SF = false;
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% OF = false;
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== 0x1
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# op ModR/M SIB displacement immediate
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0f 8c 05 00 # skip 1 instruction
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05 00 00 00 01
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05 00 00 00 02
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+run: inst: 0x00000001
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+run: inst: 0x00000005
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+run: inst: 0x0000000a
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-run: jump 5
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//:: jump if lesser or equal
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:(before "End Initialize Op Names(name)")
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put(name_0f, "8e", "jump disp16 bytes away if lesser or equal (ZF is set or SF != OF)");
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:(scenario jle_rel16_equal)
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% ZF = true;
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% SF = false;
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% OF = false;
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== 0x1
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# op ModR/M SIB displacement immediate
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0f 8e 05 00 # skip 1 instruction
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05 00 00 00 01
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05 00 00 00 02
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+run: inst: 0x00000001
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+run: jump 5
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+run: inst: 0x0000000a
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-run: inst: 0x00000005
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:(scenario jle_rel16_lesser)
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% ZF = false;
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% SF = true;
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% OF = false;
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== 0x1
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# op ModR/M SIB displacement immediate
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0f 8e 05 00 # skip 1 instruction
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05 00 00 00 01
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05 00 00 00 02
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+run: inst: 0x00000001
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+run: jump 5
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+run: inst: 0x0000000a
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-run: inst: 0x00000005
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:(before "End Two-Byte Opcodes Starting With 0f")
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case 0x8e: { // jump rel16 if SF or ZF
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const int8_t offset = imm16();
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if (ZF || SF != OF) {
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trace(90, "run") << "jump " << NUM(offset) << end();
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EIP += offset;
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}
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break;
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}
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:(scenario jle_rel16_greater)
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% ZF = false;
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% SF = false;
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% OF = false;
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== 0x1
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# op ModR/M SIB displacement immediate
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0f 8e 05 00 # skip 1 instruction
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05 00 00 00 01
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05 00 00 00 02
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+run: inst: 0x00000001
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+run: inst: 0x00000005
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+run: inst: 0x0000000a
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-run: jump 5
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