test(validation): silicon-vs-emulator lockstep for wide-decode fixes#333
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…ecoder fixes
A bare Cortex-M4 firmware runs the exact instructions covered by the cortex_m
wide-decode unit tests (LDRB.W/LDRH.W signedness, {S,U}XT{B,H}.W, and the
extend-and-add {S,U}XTA{B,H}.W) and writes results to a fixed RAM array.
Validated byte-for-byte on a real NUCLEO-L476RG over SWD: all nine results
match the emulator and the unit-test expectations exactly. lockstep.yaml is a
CI-runnable (no hardware) regression that runs the same ELF on the stm32l476
model and asserts the silicon-captured values, so any future decoder change
that diverges from silicon fails. README documents the hardware re-validation
procedure.
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A bare Cortex-M4 firmware exercises the LDRB.W/LDRH.W/{S,U}XT{B,H}.W/{S,U}XTA{B,H}.W decode fixes (PRs #328/#329/#331) and writes results to RAM. Validated byte-for-byte on a real NUCLEO-L476RG over SWD;
lockstep.yamlis a CI-runnable (no-hardware) regression asserting the labwired stm32l476 model matches the silicon-captured values.