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Tracer: Decode an all-zero instruction as c.unimp

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Fixes #396
This commit is contained in:
Philipp Wagner 2019-10-17 12:03:26 +01:00 • committed by Philipp Wagner
parent edb33cca56
commit 1c3903e2ce
1 changed files with 8 additions and 1 deletions
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9
rtl/ibex_tracer.sv
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@ -721,7 +721,14 @@ module ibex_tracer (
end else begin
unique casez (rvfi_insn[15:0])
// C0 Opcodes
INSN_CADDI4SPN: decode_ciw_insn("c.addi4spn");
INSN_CADDI4SPN: begin
if (rvfi_insn[12:2] == 11'h0) begin
// Align with pseudo-mnemonic used by GNU binutils and LLVM's MC layer
decode_mnemonic("c.unimp");
end else begin
decode_ciw_insn("c.addi4spn");
end
end
INSN_CLW: decode_compressed_load_insn("c.lw");
INSN_CSW: decode_compressed_store_insn("c.sw");
// C1 Opcodes