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//: operating directly on a register
:(scenario add_r32_to_r32)
% Reg[0].i = 0x10;
% Reg[3].i = 1;
# op ModR/M SIB displacement immediate
01 d8 # add EBX (reg 3) to EAX (reg 0)
+run: add reg 3 to effective address
+run: effective address is reg 0
+run: storing 0x00000011
:(before "End Mod Special-cases")
case 3:
// mod 3 is just register direct addressing
trace(2, "run") << "effective address is reg " << NUM(rm) << end();
result = &Reg[rm].i;
break;
//:: subtract
:(scenario subtract_r32_from_r32)
% Reg[0].i = 10;
% Reg[3].i = 1;
# op ModR/M SIB displacement immediate
29 d8 # subtract EBX (reg 3) from EAX (reg 0)
+run: subtract reg 3 from effective address
+run: effective address is reg 0
+run: storing 0x00000009
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