CoWR.alias

Description

forbidIf one writes to one VA, and reads with another that is mapped to the same PA, must the read read-from the program-order preceding write of the same PA, or something newer, regardless of the second VA? For Armv8-A, yes.

Source

[download toml source]
Page table setup Code
physical pa1; x |-> pa1; y |-> pa1; *pa1 = 0;
Thread 0
{R0=extz(0x1, 64), R1=x, R3=y}
STR X0,[X1] LDR X2,[X3]
Final State
0:X2 = 0

Execution Diagrams

Results

ETS CoWR.alias forbidden (0 of 1) 967ms
strong CoWR.alias forbidden (0 of 1) 977ms

Command-line invocation

isla-axiomatic --arch=/path/to/rems-project/isla-snapshots/aarch64.ir --config=/path/to/rems-project/isla/configs/aarch64_mmu_on.toml --footprint-config=/path/to/rems-project/isla/configs/aarch64.toml --model=/path/to/rems-project/systems-isla-tests/models/aarch64_mmu_strong_ETS.cat --armv8-page-tables --check-sat-using "(then dt2bv qe simplify solve-eqs bv)" --remove-uninteresting safe --dot . -t /path/to/litmus-tests/litmus-tests-armv8a-system-vmsa/tests/pgtable/HAND/CoWR.alias.litmus.toml

To generate diagrams we use model aarch64_mmu_no_axioms.cat to get diagrams of forbidden executions. To generate LaTeX sources of each test, pass --latex=.