//: jump to 8-bit offset //:: jump :(before "End Initialize Op Names(name)") put_new(name, "eb", "jump disp8 bytes away (jmp)"); :(scenario jump_rel8) == 0x1 # op ModR/M 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(next()); trace(90, "run") << "jump " << NUM(offset) << end(); EIP += offset; break; } //:: jump if equal/zero :(before "End Initialize Op Names(name)") put_new(name, "74", "jump disp8 bytes away if equal, if ZF is set. (jcc/jz/je)"); :(scenario je_rel8_success) % ZF = true; == 0x1 # op ModR/M 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 const int8_t offset = static_cast(next()); if (ZF) { trace(90, "run") << "jump " << NUM(offset) << end(); EIP += offset; } break; } :(scenario je_rel8_fail) % ZF = false; == 0x1 # op ModR/M 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 :(before "End Initialize Op Names(name)") put_new(name, "75", "jump disp8 bytes away if not equal, if ZF is not set. (jcc/jnz/jne)"); :(scenario jne_rel8_success) % ZF = false; == 0x1 # op ModR/M 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 const int8_t offset = static_cast(next()); if (!ZF) { trace(90, "run") << "jump " << NUM(offset) << end(); EIP += offset; } break; } :(scenario jne_rel8_fail) % ZF = true; == 0x1 # op ModR/M 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 :(before "End Initialize Op Names(name)") put_new(name, "7f", "jump disp8 bytes away if greater, if ZF is unset and SF == OF. (jcc/jg/jnle)"); :(scenario jg_rel8_success) % ZF = false; % SF = false; % OF = false; == 0x1 # op ModR/M 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 const int8_t offset = static_cast(next()); if (!ZF && SF == OF) { trace(90, "run") << "jump " << NUM(offset) << end(); EIP += offset; } break; } :(scenario jg_rel8_fail) % ZF = false; % SF = true; % OF = false; == 0x1 # op ModR/M 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 :(before "End Initialize Op Names(name)") put_new(name, "7d", "jump disp8 bytes away if greater or equal, if SF == OF. (jcc/jge/jnl)"); :(scenario jge_rel8_success) % SF = false; % OF = false; == 0x1 # op ModR/M 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 const int8_t offset = static_cast(next()); if (SF == OF) { trace(90, "run") << "jump " << NUM(offset) << end(); EIP += offset; } break; } :(scenario jge_rel8_fail) % SF = true; % OF = false; == 0x1 # op ModR/M 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 :(before "End Initialize Op Names(name)") put_new(name, "7c", "jump disp8 bytes away if lesser, if SF != OF. (jcc/jl/jnge)"); :(scenario jl_rel8_success) % ZF = false; % SF = true; % OF = false; == 0x1 # op ModR/M 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 const int8_t offset = static_cast(next()); if (SF != OF) { trace(90, "run") << "jump " << NUM(offset) << end(); EIP += offset; } break; } :(scenario jl_rel8_fail) % ZF = false; % SF = false; % OF = false; == 0x1 # op ModR/M 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 :(before "End Initialize Op Names(name)") put_new(name, "7e", "jump disp8 bytes away if lesser or equal, if ZF is set or SF != OF. (jcc/jle/jng)"); :(scenario jle_rel8_equal) % ZF = true; % SF = false; % OF = false; == 0x1 # op ModR/M 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; == 0x1 # op ModR/M 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 const int8_t offset = static_cast(next()); if (ZF || SF != OF) { trace(90, "run") << "jump " << NUM(offset) << end(); EIP += offset; } break; } :(scenario jle_rel8_greater) % ZF = false; % SF = false; % OF = false; == 0x1 # op ModR/M 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