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Forward exceptions from segment micro-ops #490

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Forward exceptions from segment micro-ops #490

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6c6d728
Fix segment micro-op exception handling
flaviens Aug 22, 2026
e225d8a
Stop segment requests on exceptions
flaviens Aug 22, 2026
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15 changes: 12 additions & 3 deletions hardware/src/segment_sequencer.sv
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Original file line number Diff line number Diff line change
Expand Up @@ -176,8 +176,13 @@ module segment_sequencer import ara_pkg::*; import rvv_pkg::*; #(
end

// Wait for an answer from Ara's backend
if (ara_resp_valid_i) begin // If exception, stop the execution
if (ara_resp_valid_i) begin
// If exception, stop the execution and forward it to CVA6
if (ara_resp_i.exception.valid) begin
ara_req_valid_o = 1'b0;
segment_cnt_en = 1'b0;
ara_resp_d = ara_resp_i;
state_d = SEGMENT_MICRO_OPS_END;
// If no exception, continue with the micro ops
end else begin
// If over - stop in the next cycle
Expand All @@ -195,8 +200,12 @@ module segment_sequencer import ara_pkg::*; import rvv_pkg::*; #(
ara_resp_valid_o = 1'b0;
// Stop injecting micro instructions
ara_req_valid_o = 1'b0;
// Wait for idle to give the final load/store_complete
if (ara_idle_i && ara_req_ready_i) begin
// A previously issued micro operation can still report an exception
if (ara_resp_valid_i && ara_resp_i.exception.valid) begin
ara_resp_d = ara_resp_i;
state_d = SEGMENT_MICRO_OPS_END;
// Otherwise, wait for idle to give the final load/store_complete
end else if (ara_idle_i && ara_req_ready_i) begin
state_d = SEGMENT_MICRO_OPS_END;
end
end
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