kbuild: Consolidate header generation from ASM offset information

[karo-tx-linux.git] / scripts / Makefile.lib

diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 0a07f9014944ed92a8e2e42983ae43be60b3e471..dd567e5d59e0158afaf87e00b6d3dc8ca376744f 100644 (file)
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -408,3 +408,31 @@ quiet_cmd_xzmisc = XZMISC  $@
 cmd_xzmisc = (cat $(filter-out FORCE,$^) | \
        xz --check=crc32 --lzma2=dict=1MiB) > $@ || \
        (rm -f $@ ; false)
+
+# ASM offsets
+# ---------------------------------------------------------------------------
+
+# Default sed regexp - multiline due to syntax constraints
+define sed-offsets
+       "/^->/{s:->#\(.*\):/* \1 */:; \
+       s:^->\([^ ]*\) [\$$#]*\([-0-9]*\) \(.*\):#define \1 \2 /* \3 */:; \
+       s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
+       s:->::; p;}"
+endef
+
+# Use filechk to avoid rebuilds when a header changes, but the resulting file
+# does not
+define filechk_offsets
+       (set -e; \
+        echo "#ifndef $2"; \
+        echo "#define $2"; \
+        echo "/*"; \
+        echo " * DO NOT MODIFY."; \
+        echo " *"; \
+        echo " * This file was generated by Kbuild"; \
+        echo " */"; \
+        echo ""; \
+        sed -ne $(sed-offsets); \
+        echo ""; \
+        echo "#endif" )
+endef