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-rw-r--r--scripts/gen-as-const.awk29
1 files changed, 29 insertions, 0 deletions
diff --git a/scripts/gen-as-const.awk b/scripts/gen-as-const.awk
new file mode 100644
index 0000000000..b29656ee71
--- /dev/null
+++ b/scripts/gen-as-const.awk
@@ -0,0 +1,29 @@
+# Script used in producing headers of assembly constants from C expressions.
+# The input to this script looks like:
+# #cpp-directive ...
+# NAME1
+# NAME2 expression ...
+# The output of this script is C code to be run through gcc -S and then
+# massaged to extract the integer constant values of the given C expressions.
+# A line giving just a name implies an expression consisting of just that name.
+
+BEGIN { started = 0 }
+
+# cpp directives go straight through.
+/^#/ { print; next }
+
+NF >= 1 && !started {
+ print "void dummy(void) {";
+ started = 1;
+}
+
+NF == 1 { sub(/^.*$/, "& &"); }
+
+NF > 1 {
+ name = $1;
+ sub(/^[^ ]+[ ]+/, "");
+ printf "asm (\"@@@name@@@%s@@@value@@@%%0@@@end@@@\" : : \"i\" (%s));\n",
+ name, $0;
+}
+
+END { if (started) print "}" }