X86 Lds Apr 2026

The disassembly pointed to one instruction: LDS .

The offending line looked innocent:

She knew LDS —Load Pointer Using DS. A relic from the segmented memory model of the 16-bit era, when pointers were 32-bit monsters: a 16-bit segment and a 16-bit offset. On her 32-bit 386, it still worked—mostly. But it was a time bomb. x86 lds