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Fix ecall and ebreak tval

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This commit is contained in:
Chris Keilbart 2024-08-16 12:47:57 -07:00
parent 724989156d
commit 0683871650
1 changed files with 11 additions and 6 deletions
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17
core/decode_and_issue.sv
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@ -290,6 +290,11 @@ module decode_and_issue
////////////////////////////////////////////////////
//ECALL/EBREAK
//The type of call instruction is depedent on the current privilege level
logic is_ecall;
logic is_ebreak;
assign is_ecall = decode.instruction inside {ECALL};
assign is_ebreak = decode.instruction inside {EBREAK};
always_comb begin
case (current_privilege)
USER_PRIVILEGE : ecall_code = ECALL_U;
@ -302,16 +307,16 @@ module decode_and_issue
always_ff @(posedge clk) begin
if (issue_stage_ready) begin
ecode <=
decode.instruction inside {ECALL} ? ecall_code :
decode.instruction inside {EBREAK} ? BREAK :
is_ecall ? ecall_code :
is_ebreak ? BREAK :
illegal_instruction_pattern ? ILLEGAL_INST :
decode.fetch_metadata.error_code; //(~decode.fetch_metadata.ok)
if (illegal_instruction_pattern)
tval <= decode.instruction;
else if (~decode.fetch_metadata.ok)
if (~decode.fetch_metadata.ok | is_ebreak)
tval <= decode.pc;
else
else if (is_ecall)
tval <= '0;
else
tval <= decode.instruction;
end
end