Coverage improvements

sim/coverage-exclusions-rv64gc.do

@@ -92,6 +92,7 @@ for {set i 0} {$i < $numcacheways} {incr i} {
     coverage exclude -scope /dut/core/ifu/bus/icache/icache/CacheWays[$i] -linerange [GetLineNum ../src/cache/cacheway.sv "exclusion-tag: icache SelectedWiteWordEn"] -item e 1 -fecexprrow 4 6
     # below: flushD can't go high during an icache write b/c of pipeline stall
     coverage exclude -scope /dut/core/ifu/bus/icache/icache/CacheWays[$i] -linerange [GetLineNum ../src/cache/cacheway.sv "exclusion-tag: cache SetValidEN"] -item e 1 -fecexprrow 4
+    coverage exclude -scope /dut/core/ifu/bus/icache/icache/CacheWays[$i] -linerange [GetLineNum ../src/cache/cacheway.sv "exclusion-tag: cache ClearValidEN"] -item e 1 -fecexprrow 4
 }
 
 ## D$ Exclusions.
@@ -107,6 +108,8 @@ for {set i 0} {$i < $numcacheways} {incr i} {
     # FlushStage=1 will never happen when SetValidWay=1 since a pipeline stall is asserted by the cache in the fetch stage, which happens before
     # going into the WRITE_LINE state (and asserting SetValidWay). No TrapM can fire and since StallW is high, a stallM caused by WFIStallM would not cause a flushW.
     coverage exclude -scope /dut/core/lsu/bus/dcache/dcache/CacheWays[$i] -linerange [GetLineNum ../src/cache/cacheway.sv "exclusion-tag: cache SetValidEN"] -item e 1 -fecexprrow 4
+    coverage exclude -scope /dut/core/lsu/bus/dcache/dcache/CacheWays[$i] -linerange [GetLineNum ../src/cache/cacheway.sv "exclusion-tag: cache ClearValidEN"] -item e 1 -fecexprrow 4
+# Not right; other ways can get flushed and dirtied simultaneously    coverage exclude -scope /dut/core/lsu/bus/dcache/dcache/CacheWays[$i] -linerange [GetLineNum ../src/cache/cacheway.sv "exclusion-tag: cache UpdateDirty"] -item c 1 -fecexprrow 6
 }
 # D$ writeback, flush, write_line, or flush_writeback states can't be cancelled by a flush
 coverage exclude -scope /dut/core/lsu/bus/dcache/dcache/cachefsm -ftrans CurrState STATE_WRITEBACK->STATE_READY STATE_FLUSH->STATE_READY STATE_WRITE_LINE->STATE_READY STATE_FLUSH_WRITEBACK->STATE_READY
@@ -237,11 +240,16 @@ coverage exclude -scope /dut/core/ifu/immu/immu -linerange $line-$line2 -item e
 coverage exclude -scope /dut/core/ifu/immu/immu -linerange $line-$line2 -item b 1
 coverage exclude -scope /dut/core/ifu/immu/immu -linerange $line-$line2 -item s 1
 
+# IMMU never disables translations
+coverage exclude -scope /dut/core/ifu/ifu/immu/immu/tlb/tlb/tlbcontrol -linerange [GetLineNum ../src/mmu/tlb/tlbcontrol.sv "assign Translate"] -item e 1 -fecexprrow 2
+coverage exclude -scope /dut/core/ifu/ifu/immu/immu/tlb/tlb/tlbcontrol -linerange [GetLineNum ../src/mmu/tlb/tlbcontrol.sv "assign UpdateDA"] -item e 1 -fecexprrow 5
+# never reaches this when ENVCFG_ADUE_1 because HPTW updates A bit first
+coverage exclude -scope /dut/core/ifu/ifu/immu/immu/tlb/tlb/tlbcontrol -linerange [GetLineNum ../src/mmu/tlb/tlbcontrol.sv "assign PrePageFault"] -item e 1 -fecexprrow 18 
+
 # IMMU PMP does not support CBO instructions
 coverage exclude -scope /dut/core/ifu/immu/immu/pmp/pmpchecker -linerange [GetLineNum ../src/mmu/pmpchecker.sv "exclusion-tag: immu-pmpcbom"] 
 coverage exclude -scope /dut/core/ifu/immu/immu/pmp/pmpchecker -linerange [GetLineNum ../src/mmu/pmpchecker.sv "exclusion-tag: immu-pmpcboz"] 
 coverage exclude -scope /dut/core/ifu/immu/immu/pmp/pmpchecker -linerange [GetLineNum ../src/mmu/pmpchecker.sv "exclusion-tag: immu-pmpcboaccess"] 
-#coverage exclude -scope /dut/core/ifu/immu/immu/pmp/pmpchecker -linerange [GetLineNum ../src/mmu/pmpchecker.sv "exclusion-tag: immu-pmpstoreamoaccessfault"] 
 
 # No irom
 set line [GetLineNum ../src/ifu/ifu.sv "~ITLBMissF & ~CacheableF & ~SelIROM"] 

src/cache/cacheway.sv

@@ -105,7 +105,7 @@ module cacheway import cvw::*; #(parameter cvw_t P,
   assign ClearDirtyWay = ClearDirty & SelData;
   assign SelectedWriteWordEn = (SetValidWay | SetDirtyWay) & ~FlushStage;  // exclusion-tag: icache SelectedWiteWordEn
   assign SetValidEN = SetValidWay & ~FlushStage;                           // exclusion-tag: cache SetValidEN
-  assign ClearValidEN = ClearValidWay & ~FlushStage;                           // exclusion-tag: cache SetValidEN
+  assign ClearValidEN = ClearValidWay & ~FlushStage;                       // exclusion-tag: cache ClearValidEN
 
   // If writing the whole line set all write enables to 1, else only set the correct word.
   assign FinalByteMask = SetValidWay ? '1 : LineByteMask; // OR
@@ -178,7 +178,7 @@ module cacheway import cvw::*; #(parameter cvw_t P,
       //if (reset) DirtyBits <= #1 {NUMLINES{1'b0}}; 
       if(CacheEn) begin
         Dirty <= #1 DirtyBits[CacheSetTag];
-        if((SetDirtyWay | ClearDirtyWay) & ~FlushStage) DirtyBits[CacheSetData] <= #1 SetDirtyWay;
+        if((SetDirtyWay | ClearDirtyWay) & ~FlushStage) DirtyBits[CacheSetData] <= #1 SetDirtyWay; // exclusion-tag: cache UpdateDirty
       end
     end
   end else assign Dirty = 1'b0;

tests/coverage/Makefile

@@ -17,7 +17,7 @@ all: $(OBJECTS)
 
 # Change many things if bit width isn't 64
 %.elf: $(SRCDIR)/%.$(SEXT) WALLY-init-lib.h Makefile
-	riscv64-unknown-elf-gcc -g -o $@ -march=rv64gqc_zba_zbb_zbc_zbs_zfh_zicboz_zicbop_zicbom -mabi=lp64 -mcmodel=medany \
+	riscv64-unknown-elf-gcc -g -o $@ -march=rv64gqc_zfa_zba_zbb_zbc_zbs_zfh_zicboz_zicbop_zicbom -mabi=lp64 -mcmodel=medany \
 	    -nostartfiles -T../../examples/link/link.ld $<
 	riscv64-unknown-elf-objdump -S $@ > $@.objdump
 	riscv64-unknown-elf-elf2hex --bit-width 64 --input $@ --output $@.memfile

tests/coverage/WALLY-init-lib.h

@@ -36,6 +36,9 @@ rvtest_entry_point:
     csrw mtvec, t0      # Initialize MTVEC to trap_handler
     csrw mideleg, zero  # Don't delegate interrupts
     csrw medeleg, zero  # Don't delegate exceptions
+    li t0, -1           # set mtimecmp to biggest number so it doesnt interrupt again
+    li t1, 0x02004000   # MTIMECMP in CLINT
+    sd t0, 0(t1)      
     li t0, 0x80         
     csrw mie, t0        # Enable machine timer interrupt
     la t0, topoftrapstack 

tests/coverage/tlbmisc.S

@@ -62,6 +62,30 @@ main:
     jalr ra, t0 # jump to misaligned gigapage
     li t0, 0x80200000
     jalr ra, t0 # jump to misaligned megapage
+    li t0, 0x7FFFFFFF80000000
+
+    
+    jalr ra, t0 # jump to page with UpperBitsUnequal
+    li t0, 0x0000000080C00000
+    jalr ra, t0 # jump to page with bad reserved bits 60:54 in PTE
+    
+    # test with ENVCFG_ADUE = 1: switch to machine mode, set ADUE, access page with A=0, clear ADUE, 
+    li a0, 3
+    ecall       # switch to machine mode
+    li t0, 1
+    slli t0, t0, 61 
+    csrs menvcfg, t0 # set menvcfg.ADUE
+    li a0, 1    
+    ecall       # switch back to supervisor mode
+    li t0, 0x0000000080E00000
+    jalr ra, t0 # jump to page without accessed bit yet set
+    li a0, 3
+    ecall       # switch to machine mode
+    li t0, 1
+    slli t0, t0, 61 
+    csrc menvcfg, t0 # clear menvcfg.ADUE
+    li a0, 1    
+    ecall       # switch back to supervisor mode
 
      # exercise malformed PBMT pages
 
@@ -147,6 +171,8 @@ main:
     li a0, 1
     ecall
 
+
+
     # wrap up
     li a0, 3 # switch back to machine mode because code at 0x80000000 may not have clean page table entry
     ecall
@@ -222,8 +248,8 @@ pagetable:
     .8byte 0x4000000020004CC1  # for VA starting at 80600000 (bad entry: nonleaf PTE can't have PBMT != 0)
     .8byte 0x00000000200054C1  # for VA starting at 80800000 (testing rwx permissiosn with cbom/cboz)
     .8byte 0x0000000020004CC1  # for VA starting at 80A00000 (pointer to NAPOT 64 KiB pages like at 80000000)
-    .8byte 0x0000000020004CC1
+    .8byte 0x0F00000020004CCF  # for VA starting at 80C00000 (bad reserved field in bits 60:54)
-    .8byte 0x0000000020004CC1
+    .8byte 0x000000002000000F  # for VA starting at 80E00000 (not dirty or accessed)
     .8byte 0x0000000020004CC1
     .8byte 0x0000000020004CC1
     .8byte 0x0000000020004CC1