factor common awk functions for CFI generation scripts into new file

There is a lot which could be common between i386 and x86_64, but none
of it will be useful for any other arch. These should be useful for
all archs, however.

Makefile

@@ -122,7 +122,7 @@ $(foreach s,$(wildcard src/*/$(ARCH)*/*.s),$(eval $(call mkasmdep,$(s))))
 # Choose invocation of assembler to be used
 # $(1) is input file, $(2) is output file, $(3) is assembler flags
 ifeq ($(ADD_CFI),yes)
-	AS_CMD = LC_ALL=C awk -f tools/add-cfi.$(ARCH).awk $< | $(CC) -x assembler -c -o $@ -
+	AS_CMD = LC_ALL=C awk -f tools/add-cfi.common.awk -f tools/add-cfi.$(ARCH).awk $< | $(CC) -x assembler -c -o $@ -
 else
 	AS_CMD = $(CC) -c -o $@ $<
 endif

tools/add-cfi.common.awk

@@ -0,0 +1,26 @@
+function hex2int(str,   i) {
+  str = tolower(str)
+
+  for (i = 1; i <= 16; i++) {
+    char = substr("0123456789abcdef", i, 1)
+    lookup[char] = i-1
+  }
+
+  result = 0
+  for (i = 1; i <= length(str); i++) {
+    result = result * 16
+    char   = substr(str, i, 1)
+    result = result + lookup[char]
+  }
+  return result
+}
+
+function parse_const(str) {
+  sign = sub(/^-/, "", str)
+  hex  = sub(/^0x/, "", str)
+  if (hex)
+    n = hex2int(str)
+  else
+    n = str+0
+  return sign ? -n : n
+}

tools/add-cfi.i386.awk

@@ -22,33 +22,6 @@ BEGIN {
   called = ""
 }
 
-function hex2int(str,   i) {
-  str = tolower(str)
-
-  for (i = 1; i <= 16; i++) {
-    char = substr("0123456789abcdef", i, 1)
-    lookup[char] = i-1
-  }
-
-  result = 0
-  for (i = 1; i <= length(str); i++) {
-    result = result * 16
-    char   = substr(str, i, 1)
-    result = result + lookup[char]
-  }
-  return result
-}
-
-function parse_const(str) {
-  sign = sub(/^-/, "", str)
-  hex  = sub(/^0x/, "", str)
-  if (hex)
-    n = hex2int(str)
-  else
-    n = str+0
-  return sign ? -n : n
-}
-
 function get_const1() {
   # for instructions with 2 operands, get 1st operand (assuming it is constant)
   match($0, /-?(0x[0-9a-fA-F]+|[0-9]+),/)