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authorRichard Henderson <richard.henderson@linaro.org>2022-10-24 22:55:26 +1000
committerRichard Henderson <richard.henderson@linaro.org>2022-11-01 08:31:41 +1100
commitcc30dc441b44ad15f4adfb13d9a68cba6fa39a23 (patch)
treef916f7faa1a1be4beba2bfa18729abc338e3d0e6 /target/nios2
parent5813c5c74a755fd0c1b10be38c6fdf5c54c468e4 (diff)
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target/openrisc: Use cpu_unwind_state_data for mfspr
Since we do not plan to exit, use cpu_unwind_state_data and extract exactly the data requested. This is a bug fix, in that we no longer clobber dflag. Consider: l.j L2 // branch l.mfspr r1, ppc // delay L1: boom L2: l.lwa r3, (r4) Here, dflag would be set by cpu_restore_state (because that is the current state of the cpu), but but not cleared by tb_stop on exiting the TB (because DisasContext has recorded the current value as zero). The next TB begins at L2 with dflag incorrectly set. If the load has a tlb miss, then the exception will be delivered as per a delay slot: with DSX set in the status register and PC decremented (delay slots restart by re-executing the branch). This will cause the return from interrupt to go to L1, and boom! Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Diffstat (limited to 'target/nios2')
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