include/asm-offsets.h: automatically generate assembler constants
A recurrent issue is that certain C level constructs like sizeof() or
offsetof() cannot be used in assembler files, which is inconvenient
when such constructs are used in the definition of macro names etc.
To avoid duplication of such definitions (and thus another cause of
problems), we adapt the Linux way to automatically generate the
respective definitions from the respective C header files.
In Linux, this is implemented in include/linux/kbuild.h, Kbuild, and
arch/*/kernel/asm-offsets.c; we adapt the code from the Linux v2.6.36
kernel tree.
We also copy the concept of the include/generated/ directory which can
be used to hold other automatically generated files as well.
We start with an architecture-independent lib/asm-offsets.c which
generates include/generated/generic-asm-offsets.h (included by
include/asm-offsets.h, which is what will be referred to in the actual
source code). Later this may be extended by architecture-specific
arch/*/lib/asm-offsets.c files that will generate a
include/generated/asm-offsets.h.
Signed-off-by: Wolfgang Denk <wd@denx.de>
Acked-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/tools/scripts/make-asm-offsets b/tools/scripts/make-asm-offsets
new file mode 100755
index 0000000..61c095f
--- /dev/null
+++ b/tools/scripts/make-asm-offsets
@@ -0,0 +1,27 @@
+#!/bin/sh
+
+# Adapted from Linux kernel's "Kbuild":
+# commit 1cdf25d704f7951d02a04064c97db547d6021872
+# Author: Christoph Lameter <clameter@sgi.com>
+
+mkdir -p $(dirname $2)
+
+# Default sed regexp - multiline due to syntax constraints
+SED_CMD="/^->/{s:->#\(.*\):/* \1 */:; \
+ s:^->\([^ ]*\) [\$$#]*\([-0-9]*\) \(.*\):#define \1 (\2) /* \3 */:; \
+ s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
+ s:->::; p;}"
+
+(set -e
+ echo "#ifndef __ASM_OFFSETS_H__"
+ echo "#define __ASM_OFFSETS_H__"
+ echo "/*"
+ echo " * DO NOT MODIFY."
+ echo " *"
+ echo " * This file was generated by $(basename $0)"
+ echo " *"
+ echo " */"
+ echo ""
+ sed -ne "${SED_CMD}" $1
+ echo ""
+ echo "#endif" ) > $2