kbuild: asm offset generation for ARM

Switch ARM to the new way of asm offset generation.

arch/arm/Makefile

@@ -195,29 +195,25 @@ endif
 MAKEBOOT	 =$(MAKE) -C arch/$(ARCH)/boot
 MAKETOOLS	 =$(MAKE) -C arch/$(ARCH)/tools
 
-# The following is a hack to get 'constants.h' up
-# to date before starting compilation
-
-$(patsubst %,_dir_%, $(SUBDIRS)): maketools
-$(patsubst %,_modsubdir_%,$(MOD_DIRS)): maketools
-
 #	Update machine arch and proc symlinks if something which affects
 #	them changed.  We use .arch and .proc to indicate when they were
 #	updated last, otherwise make uses the target directory mtime.
 
 include/asm-arm/.arch: $(wildcard include/config/arch/*.h)
-	@echo 'Making asm-arm/arch -> asm-arm/arch-$(INCDIR) symlink'
+	@echo '  Making asm-arm/arch -> asm-arm/arch-$(INCDIR) symlink'
 	@rm -f include/asm-arm/arch
 	@ln -sf arch-$(INCDIR) include/asm-arm/arch
 	@touch $@
 
 include/asm-arm/.proc: $(wildcard include/config/cpu/32.h) $(wildcard include/config/cpu/26.h)
-	@echo 'Making asm-arm/proc -> asm-arm/proc-$(PROCESSOR) symlink'
+	@echo '  Making asm-arm/proc -> asm-arm/proc-$(PROCESSOR) symlink'
 	@rm -f include/asm-arm/proc
 	@ln -sf proc-$(PROCESSOR) include/asm-arm/proc
 	@touch $@
 
-.hdepend: include/asm-arm/.arch include/asm-arm/.proc
+prepare: include/asm-arm/.arch include/asm-arm/.proc \
+	 include/asm-arm/constants.h
+	@$(MAKETOOLS)
 
 vmlinux: arch/arm/vmlinux.lds
 
@@ -234,7 +230,6 @@ CLEAN_FILES	+= \
 	arch/arm/vmlinux.lds
 
 MRPROPER_FILES	+= \
-	arch/arm/tools/constants.h* \
 	include/asm-arm/arch include/asm-arm/.arch \
 	include/asm-arm/proc include/asm-arm/.proc \
 	include/asm-arm/constants.h* \
@@ -247,13 +242,9 @@ archmrproper: FORCE
 archclean: FORCE
 	@$(MAKEBOOT) clean
 
-archdep: FORCE
-	@$(MAKETOOLS) dep
-	@$(MAKEBOOT) dep
-
 # we need version.h
 maketools: include/linux/version.h FORCE
-	@$(MAKETOOLS) all
+	@$(MAKETOOLS)
 
 # My testing targets (that short circuit a few dependencies)
 zImg:;	@$(MAKEBOOT) zImage
@@ -277,3 +268,13 @@ bp:;	@$(MAKEBOOT) bootpImage
 	  echo "$$CFG does not exist"; \
 	fi; \
 	)
+
+arch/$(ARCH)/kernel/asm-offsets.s: include/asm include/linux/version.h \
+				   include/config/MARKER
+
+include/asm-$(ARCH)/constants.h.tmp: arch/$(ARCH)/kernel/asm-offsets.s
+	@$(generate-asm-offsets.h) < $< > $@
+
+include/asm-$(ARCH)/constants.h: include/asm-$(ARCH)/constants.h.tmp
+	@echo -n '  Generating $@'
+	@$(update-if-changed)

arch/arm/boot/Makefile

@@ -145,5 +145,3 @@ clean:
 	$(RM) Image zImage bootpImage
 	@$(MAKE) -C compressed clean
 	@$(MAKE) -C bootp clean
-
-dep:

arch/arm/tools/getconstants.c → arch/arm/kernel/asm-offsets.c

 /*
- *  linux/arch/arm/tools/getconsdata.c
- *
  * Copyright (C) 1995-2001 Russell King
+ *               2001-2002 Keith Owens
+ *     
+ * Generate definitions needed by assembly language modules.
+ * This code generates raw asm output which is post-processed to extract
+ * and format the required data.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */
+
 #include <linux/config.h>
 #include <linux/sched.h>
 #include <linux/mm.h>
@@ -31,45 +35,48 @@
 #warning GCC 2.95.2 and earlier miscompiles kernels.
 #endif
 
-#define OFF_TSK(n) (unsigned long)&(((struct task_struct *)0)->n)
-#define OFF_VMA(n) (unsigned long)&(((struct vm_area_struct *)0)->n)
-
-#define DEFN(name,off) asm("\n#define "name" %0" :: "I" (off))
-
-void func(void)
-{
-DEFN("TSK_USED_MATH",		OFF_TSK(used_math));
-DEFN("TSK_ACTIVE_MM",		OFF_TSK(active_mm));
+/* Use marker if you need to separate the values later */
 
-DEFN("VMA_VM_MM",		OFF_VMA(vm_mm));
-DEFN("VMA_VM_FLAGS",		OFF_VMA(vm_flags));
+#define DEFINE(sym, val) \
+        asm volatile("\n->" #sym " %0 " #val : : "i" (val))
 
-DEFN("VM_EXEC",			VM_EXEC);
+#define BLANK() asm volatile("\n->" : : )
 
+int main(void)
+{
+  DEFINE(TSK_USED_MATH,		offsetof(struct task_struct, used_math));
+  DEFINE(TSK_ACTIVE_MM,		offsetof(struct task_struct, active_mm));
+  BLANK();
+  DEFINE(VMA_VM_MM,		offsetof(struct vm_area_struct, vm_mm));
+  DEFINE(VMA_VM_FLAGS,		offsetof(struct vm_area_struct, vm_flags));
+  BLANK();
+  DEFINE(VM_EXEC,	       	VM_EXEC);
+  BLANK();
 #ifdef CONFIG_CPU_32
-DEFN("HPTE_TYPE_SMALL",		PTE_TYPE_SMALL);
-DEFN("HPTE_AP_READ",		PTE_AP_READ);
-DEFN("HPTE_AP_WRITE",		PTE_AP_WRITE);
-
-DEFN("LPTE_PRESENT",		L_PTE_PRESENT);
-DEFN("LPTE_YOUNG",		L_PTE_YOUNG);
-DEFN("LPTE_BUFFERABLE",		L_PTE_BUFFERABLE);
-DEFN("LPTE_CACHEABLE",		L_PTE_CACHEABLE);
-DEFN("LPTE_USER",		L_PTE_USER);
-DEFN("LPTE_WRITE",		L_PTE_WRITE);
-DEFN("LPTE_EXEC",		L_PTE_EXEC);
-DEFN("LPTE_DIRTY",		L_PTE_DIRTY);
+  DEFINE(HPTE_TYPE_SMALL,      	PTE_TYPE_SMALL);
+  DEFINE(HPTE_AP_READ,		PTE_AP_READ);
+  DEFINE(HPTE_AP_WRITE,		PTE_AP_WRITE);
+  BLANK();
+  DEFINE(LPTE_PRESENT,		L_PTE_PRESENT);
+  DEFINE(LPTE_YOUNG,		L_PTE_YOUNG);
+  DEFINE(LPTE_BUFFERABLE,      	L_PTE_BUFFERABLE);
+  DEFINE(LPTE_CACHEABLE,       	L_PTE_CACHEABLE);
+  DEFINE(LPTE_USER,		L_PTE_USER);
+  DEFINE(LPTE_WRITE,		L_PTE_WRITE);
+  DEFINE(LPTE_EXEC,		L_PTE_EXEC);
+  DEFINE(LPTE_DIRTY,		L_PTE_DIRTY);
 #endif
-
+  BLANK();
 #ifdef CONFIG_CPU_26
-DEFN("PAGE_PRESENT",		_PAGE_PRESENT);
-DEFN("PAGE_READONLY",		_PAGE_READONLY);
-DEFN("PAGE_NOT_USER",		_PAGE_NOT_USER);
-DEFN("PAGE_OLD",		_PAGE_OLD);
-DEFN("PAGE_CLEAN",		_PAGE_CLEAN);
+  DEFINE(PAGE_PRESENT,		_PAGE_PRESENT);
+  DEFINE(PAGE_READONLY,		_PAGE_READONLY);
+  DEFINE(PAGE_NOT_USER,		_PAGE_NOT_USER);
+  DEFINE(PAGE_OLD,		_PAGE_OLD);
+  DEFINE(PAGE_CLEAN,		_PAGE_CLEAN);
 #endif
-
-DEFN("PAGE_SZ",			PAGE_SIZE);
-
-DEFN("SYS_ERROR0",		0x9f0000);
+  BLANK();
+  DEFINE(PAGE_SZ,	       	PAGE_SIZE);
+  BLANK();
+  DEFINE(SYS_ERROR0,		0x9f0000);
+  return 0; 
 }

arch/arm/tools/Makefile

@@ -4,40 +4,9 @@
 # Copyright (C) 2001 Russell King
 #
 
-all:	$(TOPDIR)/include/asm-arm/mach-types.h \
-	$(TOPDIR)/include/asm-arm/constants.h
+all:	$(TOPDIR)/include/asm-arm/mach-types.h
 
 $(TOPDIR)/include/asm-arm/mach-types.h: mach-types gen-mach-types
 	awk -f gen-mach-types mach-types > $@
 
-# Generate the constants.h header file using the compiler.  We get
-# the compiler to spit out assembly code, and then mundge it into
-# what we want.  We do this in several stages so make picks up on
-# any errors that occur along the way.
-
-constants.h: constants-hdr getconstants.c
-	$(CC) $(CFLAGS) -S -o $@.tmp.1 getconstants.c
-	sed 's/^\(#define .* \)[#$$]\(.*\)/\1\2/;/^#define/!d' $@.tmp.1 > $@.tmp.2
-	cat constants-hdr $@.tmp.2 > $@
-	$(RM) $@.tmp*
-
-# Only update include/asm-arm/constants.h when it has actually changed.
-
-$(TOPDIR)/include/asm-arm/constants.h: constants.h
-	cmp constants.h $@ >/dev/null 2>&1 || cp -p constants.h $@
-
-# Build our dependencies, and then generate the constants and
-# mach-types header files.  If we do it now, mkdep will pick
-# the dependencies up later on when it runs through the other
-# directories
-
-dep:
-	$(TOPDIR)/scripts/mkdep $(CFLAGS) $(EXTRA_CFLAGS) -- getconstants.c |\
-	 sed s,getconstants.o,constants.h, > .depend
-	$(MAKE) all
-
-.PHONY:	all dep
-
-ifneq ($(wildcard .depend),)
-include .depend
-endif
+.PHONY:	all

arch/arm/tools/constants-hdr

-/*
- * This file is automatically generated from arch/arm/tools/getconstants.c.
- * Do not edit!  Only include this file in assembly (.S) files!
- */
-