diff options
| -rw-r--r-- | subx/012direct_addressing.cc | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/subx/012direct_addressing.cc b/subx/012direct_addressing.cc index d788904b..6352d90c 100644 --- a/subx/012direct_addressing.cc +++ b/subx/012direct_addressing.cc @@ -1,5 +1,14 @@ //: 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 @@ -8,3 +17,12 @@ case 3: 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 |