diff options
| author | Kartik Agaram <vc@akkartik.com> | 2018-07-10 20:27:21 -0700 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2018-07-10 20:27:21 -0700 |
| commit | 1a48f95a870559112eb7d3a6ecf236c78db13f5b (patch) | |
| tree | 36176d111b2d8d5c4c79c2018209b3db272da913 /subx/012indirect_addressing.cc | |
| parent | 5e2e2eb5da2bcbb0d4e485ecc73bb9697afa1bac (diff) | |
| download | mu-1a48f95a870559112eb7d3a6ecf236c78db13f5b.tar.gz | |
4338 - preliminary support for data segments
Diffstat (limited to 'subx/012indirect_addressing.cc')
| -rw-r--r-- | subx/012indirect_addressing.cc | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/subx/012indirect_addressing.cc b/subx/012indirect_addressing.cc index 2901f8d5..304467f7 100644 --- a/subx/012indirect_addressing.cc +++ b/subx/012indirect_addressing.cc @@ -1,12 +1,15 @@ //: operating on memory at the address provided by some register +//: we'll now start providing data in a separate segment :(scenario add_r32_to_mem_at_r32) % Reg[3].i = 0x10; % Reg[0].i = 0x60; -% write_mem_i32(0x60, 1); +== 0x01 # code segment # op ModR/M SIB displacement immediate 01 18 # add EBX to *EAX # ModR/M in binary: 00 (indirect mode) 011 (src EAX) 000 (dest EAX) +== 0x60 # data segment +01 00 00 00 # 1 +run: add EBX to r/m32 +run: effective address is 0x60 (EAX) +run: storing 0x00000011 |