tools/tests: remove scas requirement

I'm about to break compatibility with scas. Before I do that, I
need to adjusts tests. Instead of running scas to compare results,
we commit expected result as binaries directly in the repo.

tools/tests/zasm/geninstrs.py

@@ -1,6 +1,8 @@
 #!/usr/bin/env python3
 # Generate almost all possible combination for instructions from instruction
 # tables
+# When zasm supported instructions change, use this script to update
+# allinstrs.asm
 
 import sys
 
@@ -108,6 +110,11 @@ def genargs(argspec):
     grp = argGrpTbl[argspec]
     return [argspecTbl[a] for a in grp]
 
+# process a 'n' arg into an 'e' one
+def eargs(args):
+    newargs = ['$+'+s for s in args[:-1]]
+    return newargs + ['$-'+s for s in args[:-1]]
+
 def p(line):
     if line not in BLACKLIST:
         print(line)
@@ -131,12 +138,16 @@ def main():
         if n in {'BIT', 'SET', 'RES'}:
             # we only want to keep 1, 2, 4
             args1 = args1[:3]
+        if n in {'JR', 'DJNZ'} and a1 == 'n':
+            args1 = eargs(args1)
         if n == 'IM':
             args1 = [0, 1, 2]
         if args1:
             for arg1 in args1:
                 args2 = genargs(a2)
                 if args2:
+                    if n in {'JR', 'DJNZ'} and a2 == 'n':
+                        args2 = eargs(args2)
                     for arg2 in args2:
                         p(f"{n} {arg1}, {arg2}")
                 else:

tools/tests/zasm/runtests.sh

@@ -3,7 +3,6 @@
 set -e
 
 TMPFILE=$(mktemp)
-SCAS=scas
 KERNEL=../../../kernel
 APPS=../../../apps
 ZASM=../../zasm.sh
@@ -12,7 +11,7 @@ ASMFILE=${APPS}/zasm/instr.asm
 cmpas() {
     FN=$1
     shift 1
-    EXPECTED=$($SCAS -I ${KERNEL} -I ${APPS} -o - "${FN}" | xxd)
+    EXPECTED=$(xxd ${FN}.expected)
     ACTUAL=$(cat ${FN} | $ZASM "$@" | xxd)
     if [ "$ACTUAL" == "$EXPECTED" ]; then
         echo ok
@@ -25,15 +24,9 @@ cmpas() {
     fi
 }
 
-for fn in test*.asm; do
+for fn in *.asm; do
     echo "Comparing ${fn}"
     cmpas $fn "${KERNEL}" "${APPS}"
 done
 
-./geninstrs.py $ASMFILE | \
-while read line; do
-    echo $line | tee "${TMPFILE}"
-    cmpas ${TMPFILE}
-done
-
 ./errtests.sh

tools/tests/zasm/test3.asm.expected

@@ -0,0 +1 @@
+<EFBFBD>0
_<><5F>0
$o<>

tools/tests/zasm/test5.asm.expected

@@ -0,0 +1 @@
+>D>!>(

tools/tests/zasm/test8.asm.expected

@@ -0,0 +1 @@
+<EFBFBD><EFBFBD><18>