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VexRiscv
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ensure rvc 0 is detected as a illegal instruction

This commit is contained in:
Dolu1990 2022-11-17 11:03:42 +01:00
parent 5e17ab62d6
commit 36c3346e51
1 changed files with 4 additions and 1 deletions
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5
src/main/scala/vexriscv/plugin/Misc.scala
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@ -42,7 +42,10 @@ object RvcDecompressor{
val x2 = B"00010" val x2 = B"00010"
switch(i(1 downto 0) ## i(15 downto 13)){ switch(i(1 downto 0) ## i(15 downto 13)){
is(0){ret := addi5spnImm ## B"00010" ## B"000" ## rcl ## B"0010011"} //C.ADDI4SPN -> addi rd0, x2, nzuimm[9:2]. is(0){
ret := addi5spnImm ## B"00010" ## B"000" ## rcl ## B"0010011"
when(i(12 downto 2) === 0) { ret := 0 } //Ensure 0 => illegal
} //C.ADDI4SPN -> addi rd0, x2, nzuimm[9:2].
if(rvd) is(1){ret := ldImm ## rch ## B"011" ## rcl ## B"0000111"} // C.FLD if(rvd) is(1){ret := ldImm ## rch ## B"011" ## rcl ## B"0000111"} // C.FLD
is(2){ret := lwImm ## rch ## B"010" ## rcl ## B"0000011"} //C.LW -> lw rd', offset[6:2](rs1') is(2){ret := lwImm ## rch ## B"010" ## rcl ## B"0000011"} //C.LW -> lw rd', offset[6:2](rs1')
if(rvf) is(3){ret := lwImm ## rch ## B"010" ## rcl ## B"0000111"} // C.FLW if(rvf) is(3){ret := lwImm ## rch ## B"010" ## rcl ## B"0000111"} // C.FLW