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fix(riscv): set FS before fp restore/clear in switch_to #30

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Merged
equation314 merged 1 commit into from
Mar 23, 2026
Merged

fix(riscv): set FS before fp restore/clear in switch_to #30

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3 changes: 2 additions & 1 deletion src/riscv/context.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -94,14 +94,15 @@ impl FpState {
// after saving, we set the FP state to clean
self.fs = FS::Clean;
}
// set the FP state to the next task's FP state
unsafe { sstatus::set_fs(next_fp_state.fs) };
// restore the next task's FP state
match next_fp_state.fs {
FS::Clean => next_fp_state.restore(), // the next task's FP state is clean, we should restore it
FS::Initial => FpState::clear(), // restore the FP state as constant values(all 0)
FS::Off => {} // do nothing
FS::Dirty => unreachable!("FP state of the next task should not be dirty"),
}
unsafe { sstatus::set_fs(next_fp_state.fs) }; // set the FP state to the next task's FP state
}
}

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