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| //: jump to 8-bit offset | |
| //:: jump | |
| :(scenario jump_rel8) | |
| # op ModRM SIB displacement immediate | |
| eb 05 # skip 1 instruction | |
| 05 00 00 00 01 | |
| 05 00 00 00 02 | |
| +run: inst: 0x00000001 | |
| +run: jump 5 | |
| +run: inst: 0x00000008 | |
| -run: inst: 0x00000003 | |
| :(before "End Single-Byte Opcodes") | |
| case 0xeb: { // jump rel8 | |
| int8_t offset = static_cast<int>(next()); | |
| trace(2, "run") << "jump " << NUM(offset) << end(); | |
| EIP += offset; | |
| break; | |
| } | |
| //:: jump if equal/zero | |
| :(scenario je_rel8_success) | |
| % ZF = true; | |
| # op ModRM SIB displacement immediate | |
| 74 05 # skip 1 instruction | |
| 05 00 00 00 01 | |
| 05 00 00 00 02 | |
| +run: inst: 0x00000001 | |
| +run: jump 5 | |
| +run: inst: 0x00000008 | |
| -run: inst: 0x00000003 | |
| :(before "End Single-Byte Opcodes") | |
| case 0x74: { // jump rel8 if ZF | |
| int8_t offset = static_cast<int>(next()); | |
| if (ZF) { | |
| trace(2, "run") << "jump " << NUM(offset) << end(); | |
| EIP += offset; | |
| } | |
| break; | |
| } | |
| :(scenario je_rel8_fail) | |
| % ZF = false; | |
| # op ModRM SIB displacement immediate | |
| 74 05 # skip 1 instruction | |
| 05 00 00 00 01 | |
| 05 00 00 00 02 | |
| +run: inst: 0x00000001 | |
| +run: inst: 0x00000003 | |
| +run: inst: 0x00000008 | |
| -run: jump 5 | |
| //:: jump if not equal/not zero | |
| :(scenario jne_rel8_success) | |
| % ZF = false; | |
| # op ModRM SIB displacement immediate | |
| 75 05 # skip 1 instruction | |
| 05 00 00 00 01 | |
| 05 00 00 00 02 | |
| +run: inst: 0x00000001 | |
| +run: jump 5 | |
| +run: inst: 0x00000008 | |
| -run: inst: 0x00000003 | |
| :(before "End Single-Byte Opcodes") | |
| case 0x75: { // jump rel8 unless ZF | |
| int8_t offset = static_cast<int>(next()); | |
| if (!ZF) { | |
| trace(2, "run") << "jump " << NUM(offset) << end(); | |
| EIP += offset; | |
| } | |
| break; | |
| } | |
| :(scenario jne_rel8_fail) | |
| % ZF = true; | |
| # op ModRM SIB displacement immediate | |
| 75 05 # skip 1 instruction | |
| 05 00 00 00 01 | |
| 05 00 00 00 02 | |
| +run: inst: 0x00000001 | |
| +run: inst: 0x00000003 | |
| +run: inst: 0x00000008 | |
| -run: jump 5 | |
| //:: jump if greater | |
| :(scenario jg_rel8_success) | |
| % ZF = false; | |
| % SF = false; | |
| % OF = false; | |
| # op ModRM SIB displacement immediate | |
| 7f 05 # skip 1 instruction | |
| 05 00 00 00 01 | |
| 05 00 00 00 02 | |
| +run: inst: 0x00000001 | |
| +run: jump 5 | |
| +run: inst: 0x00000008 | |
| -run: inst: 0x00000003 | |
| :(before "End Single-Byte Opcodes") | |
| case 0x7f: { // jump rel8 if !SF and !ZF | |
| int8_t offset = static_cast<int>(next()); | |
| if (!ZF && SF == OF) { | |
| trace(2, "run") << "jump " << NUM(offset) << end(); | |
| EIP += offset; | |
| } | |
| break; | |
| } | |
| :(scenario jg_rel8_fail) | |
| % ZF = false; | |
| % SF = true; | |
| % OF = false; | |
| # op ModRM SIB displacement immediate | |
| 7f 05 # skip 1 instruction | |
| 05 00 00 00 01 | |
| 05 00 00 00 02 | |
| +run: inst: 0x00000001 | |
| +run: inst: 0x00000003 | |
| +run: inst: 0x00000008 | |
| -run: jump 5 | |
| //:: jump if greater or equal | |
| :(scenario jge_rel8_success) | |
| % SF = false; | |
| % OF = false; | |
| # op ModRM SIB displacement immediate | |
| 7d 05 # skip 1 instruction | |
| 05 00 00 00 01 | |
| 05 00 00 00 02 | |
| +run: inst: 0x00000001 | |
| +run: jump 5 | |
| +run: inst: 0x00000008 | |
| -run: inst: 0x00000003 | |
| :(before "End Single-Byte Opcodes") | |
| case 0x7d: { // jump rel8 if !SF | |
| int8_t offset = static_cast<int>(next()); | |
| if (SF == OF) { | |
| trace(2, "run") << "jump " << NUM(offset) << end(); | |
| EIP += offset; | |
| } | |
| break; | |
| } | |
| :(scenario jge_rel8_fail) | |
| % SF = true; | |
| % OF = false; | |
| # op ModRM SIB displacement immediate | |
| 7d 05 # skip 1 instruction | |
| 05 00 00 00 01 | |
| 05 00 00 00 02 | |
| +run: inst: 0x00000001 | |
| +run: inst: 0x00000003 | |
| +run: inst: 0x00000008 | |
| -run: jump 5 | |
| //:: jump if lesser | |
| :(scenario jl_rel8_success) | |
| % ZF = false; | |
| % SF = true; | |
| % OF = false; | |
| # op ModRM SIB displacement immediate | |
| 7c 05 # skip 1 instruction | |
| 05 00 00 00 01 | |
| 05 00 00 00 02 | |
| +run: inst: 0x00000001 | |
| +run: jump 5 | |
| +run: inst: 0x00000008 | |
| -run: inst: 0x00000003 | |
| :(before "End Single-Byte Opcodes") | |
| case 0x7c: { // jump rel8 if SF and !ZF | |
| int8_t offset = static_cast<int>(next()); | |
| if (SF != OF) { | |
| trace(2, "run") << "jump " << NUM(offset) << end(); | |
| EIP += offset; | |
| } | |
| break; | |
| } | |
| :(scenario jl_rel8_fail) | |
| % ZF = false; | |
| % SF = false; | |
| % OF = false; | |
| # op ModRM SIB displacement immediate | |
| 7c 05 # skip 1 instruction | |
| 05 00 00 00 01 | |
| 05 00 00 00 02 | |
| +run: inst: 0x00000001 | |
| +run: inst: 0x00000003 | |
| +run: inst: 0x00000008 | |
| -run: jump 5 | |
| //:: jump if lesser or equal | |
| :(scenario jle_rel8_equal) | |
| % ZF = true; | |
| % SF = false; | |
| % OF = false; | |
| # op ModRM SIB displacement immediate | |
| 7e 05 # skip 1 instruction | |
| 05 00 00 00 01 | |
| 05 00 00 00 02 | |
| +run: inst: 0x00000001 | |
| +run: jump 5 | |
| +run: inst: 0x00000008 | |
| -run: inst: 0x00000003 | |
| :(scenario jle_rel8_lesser) | |
| % ZF = false; | |
| % SF = true; | |
| % OF = false; | |
| # op ModRM SIB displacement immediate | |
| 7e 05 # skip 1 instruction | |
| 05 00 00 00 01 | |
| 05 00 00 00 02 | |
| +run: inst: 0x00000001 | |
| +run: jump 5 | |
| +run: inst: 0x00000008 | |
| -run: inst: 0x00000003 | |
| :(before "End Single-Byte Opcodes") | |
| case 0x7e: { // jump rel8 if SF or ZF | |
| int8_t offset = static_cast<int>(next()); | |
| if (ZF || SF != OF) { | |
| trace(2, "run") << "jump " << NUM(offset) << end(); | |
| EIP += offset; | |
| } | |
| break; | |
| } | |
| :(scenario jle_rel8_greater) | |
| % ZF = false; | |
| % SF = false; | |
| % OF = false; | |
| # op ModRM SIB displacement immediate | |
| 7e 05 # skip 1 instruction | |
| 05 00 00 00 01 | |
| 05 00 00 00 02 | |
| +run: inst: 0x00000001 | |
| +run: inst: 0x00000003 | |
| +run: inst: 0x00000008 | |
| -run: jump 5 |