Merge tp1.ruhr-uni-bochum.de:/scratch/kai/kernel/v2.5/linux-2.5

into tp1.ruhr-uni-bochum.de:/scratch/kai/kernel/v2.5/linux-2.5.make

Makefile

@@ -405,30 +405,17 @@ $(SUBDIRS): prepare
 
 .PHONY: prepare
 prepare: include/linux/version.h include/asm include/config/MARKER
-ifdef CONFIG_MODVERSIONS
 ifdef KBUILD_MODULES
 ifeq ($(origin SUBDIRS),file)
 	$(Q)rm -rf $(MODVERDIR)
-	$(Q)mkdir $(MODVERDIR)
 else
 	@echo '*** Warning: Overriding SUBDIRS on the command line can cause'
-	@echo '***          inconsistencies with module symbol versions'
-endif
+	@echo '***          inconsistencies'
 endif
+	$(Q)mkdir -p $(MODVERDIR)
 endif
 	@echo '  Starting the build. KBUILD_BUILTIN=$(KBUILD_BUILTIN) KBUILD_MODULES=$(KBUILD_MODULES)'
 
-#	We need to build init/vermagic.o before descending since all modules
-#	(*.ko) need it already
-
-ifdef CONFIG_MODULES
-
-prepare: init/vermagic.o
-
-init/vermagic.o: include/linux/version.h
-
-endif
-
 #	This can be used by arch/$ARCH/Makefile to preprocess
 #	their vmlinux.lds.S file
 
@@ -518,21 +505,15 @@ all: modules
 
 #	Build modules
 
-.PHONY: modules __modversions
-modules: $(SUBDIRS) __modversions
-
-ifdef CONFIG_MODVERSIONS
-
-__modversions: vmlinux $(SUBDIRS)
-	@echo '  Recording module symbol versions.';
-	$(Q)$(MAKE) -rR -f scripts/Makefile.modver
-
-endif
+.PHONY: modules
+modules: $(SUBDIRS) $(if $(CONFIG_MODVERSIONS),vmlinux)
+	@echo '  Building modules, stage 2.';
+	$(Q)$(MAKE) -rR -f scripts/Makefile.modpost
 
 #	Install modules
 
 .PHONY: modules_install
-modules_install: _modinst_ $(patsubst %, _modinst_%, $(SUBDIRS)) _modinst_post
+modules_install: _modinst_ _modinst_post
 
 .PHONY: _modinst_
 _modinst_:
@@ -540,6 +521,7 @@ _modinst_:
 	@rm -f $(MODLIB)/build
 	@mkdir -p $(MODLIB)/kernel
 	@ln -s $(TOPDIR) $(MODLIB)/build
+	$(Q)$(MAKE) -rR -f scripts/Makefile.modinst
 
 # If System.map exists, run depmod.  This deliberately does not have a
 # dependency on System.map since that would run the dependency tree on
@@ -552,13 +534,9 @@ else
 depmod_opts	:= -b $(INSTALL_MOD_PATH) -r
 endif
 .PHONY: _modinst_post
-_modinst_post:
+_modinst_post: _modinst_
 	if [ -r System.map ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
 
-.PHONY: $(patsubst %, _modinst_%, $(SUBDIRS))
-$(patsubst %, _modinst_%, $(SUBDIRS)) :
-	$(Q)$(MAKE) -rR -f scripts/Makefile.modinst obj=$(patsubst _modinst_%,%,$@)
-
 else # CONFIG_MODULES
 
 # Modules not configured

include/linux/mod_devicetable.h

+/*
+ * Device tables which are exported to userspace via
+ * scripts/table2alias.c.  You must keep that file in sync with this
+ * header.
+ */
+
+#ifndef LINUX_MOD_DEVICETABLE_H
+#define LINUX_MOD_DEVICETABLE_H
+
+#ifdef __KERNEL__
+#include <linux/types.h>
+typedef unsigned long kernel_ulong_t;
+#endif
+
+#define PCI_ANY_ID (~0)
+
+struct pci_device_id {
+	__u32 vendor, device;		/* Vendor and device ID or PCI_ANY_ID*/
+	__u32 subvendor, subdevice;	/* Subsystem ID's or PCI_ANY_ID */
+	__u32 class, class_mask;	/* (class,subclass,prog-if) triplet */
+	kernel_ulong_t driver_data;	/* Data private to the driver */
+};
+
+/*
+ * Device table entry for "new style" table-driven USB drivers.
+ * User mode code can read these tables to choose which modules to load.
+ * Declare the table as a MODULE_DEVICE_TABLE.
+ *
+ * A probe() parameter will point to a matching entry from this table.
+ * Use the driver_info field for each match to hold information tied
+ * to that match:  device quirks, etc.
+ *
+ * Terminate the driver's table with an all-zeroes entry.
+ * Use the flag values to control which fields are compared.
+ */
+
+/**
+ * struct usb_device_id - identifies USB devices for probing and hotplugging
+ * @match_flags: Bit mask controlling of the other fields are used to match
+ *	against new devices.  Any field except for driver_info may be used,
+ *	although some only make sense in conjunction with other fields.
+ *	This is usually set by a USB_DEVICE_*() macro, which sets all
+ *	other fields in this structure except for driver_info.
+ * @idVendor: USB vendor ID for a device; numbers are assigned
+ *	by the USB forum to its members.
+ * @idProduct: Vendor-assigned product ID.
+ * @bcdDevice_lo: Low end of range of vendor-assigned product version numbers.
+ *	This is also used to identify individual product versions, for
+ *	a range consisting of a single device.
+ * @bcdDevice_hi: High end of version number range.  The range of product
+ *	versions is inclusive.
+ * @bDeviceClass: Class of device; numbers are assigned
+ *	by the USB forum.  Products may choose to implement classes,
+ *	or be vendor-specific.  Device classes specify behavior of all
+ *	the interfaces on a devices.
+ * @bDeviceSubClass: Subclass of device; associated with bDeviceClass.
+ * @bDeviceProtocol: Protocol of device; associated with bDeviceClass.
+ * @bInterfaceClass: Class of interface; numbers are assigned
+ *	by the USB forum.  Products may choose to implement classes,
+ *	or be vendor-specific.  Interface classes specify behavior only
+ *	of a given interface; other interfaces may support other classes.
+ * @bInterfaceSubClass: Subclass of interface; associated with bInterfaceClass.
+ * @bInterfaceProtocol: Protocol of interface; associated with bInterfaceClass.
+ * @driver_info: Holds information used by the driver.  Usually it holds
+ *	a pointer to a descriptor understood by the driver, or perhaps
+ *	device flags.
+ *
+ * In most cases, drivers will create a table of device IDs by using
+ * USB_DEVICE(), or similar macros designed for that purpose.
+ * They will then export it to userspace using MODULE_DEVICE_TABLE(),
+ * and provide it to the USB core through their usb_driver structure.
+ *
+ * See the usb_match_id() function for information about how matches are
+ * performed.  Briefly, you will normally use one of several macros to help
+ * construct these entries.  Each entry you provide will either identify
+ * one or more specific products, or will identify a class of products
+ * which have agreed to behave the same.  You should put the more specific
+ * matches towards the beginning of your table, so that driver_info can
+ * record quirks of specific products.
+ */
+struct usb_device_id {
+	/* which fields to match against? */
+	__u16		match_flags;
+
+	/* Used for product specific matches; range is inclusive */
+	__u16		idVendor;
+	__u16		idProduct;
+	__u16		bcdDevice_lo;
+	__u16		bcdDevice_hi;
+
+	/* Used for device class matches */
+	__u8		bDeviceClass;
+	__u8		bDeviceSubClass;
+	__u8		bDeviceProtocol;
+
+	/* Used for interface class matches */
+	__u8		bInterfaceClass;
+	__u8		bInterfaceSubClass;
+	__u8		bInterfaceProtocol;
+
+	/* not matched against */
+	kernel_ulong_t	driver_info;
+};
+
+/* Some useful macros to use to create struct usb_device_id */
+#define USB_DEVICE_ID_MATCH_VENDOR		0x0001
+#define USB_DEVICE_ID_MATCH_PRODUCT		0x0002
+#define USB_DEVICE_ID_MATCH_DEV_LO		0x0004
+#define USB_DEVICE_ID_MATCH_DEV_HI		0x0008
+#define USB_DEVICE_ID_MATCH_DEV_CLASS		0x0010
+#define USB_DEVICE_ID_MATCH_DEV_SUBCLASS	0x0020
+#define USB_DEVICE_ID_MATCH_DEV_PROTOCOL	0x0040
+#define USB_DEVICE_ID_MATCH_INT_CLASS		0x0080
+#define USB_DEVICE_ID_MATCH_INT_SUBCLASS	0x0100
+#define USB_DEVICE_ID_MATCH_INT_PROTOCOL	0x0200
+
+#endif /* LINUX_MOD_DEVICETABLE_H */

include/linux/module.h

@@ -57,13 +57,14 @@ search_extable(const struct exception_table_entry *first,
 	       unsigned long value);
 
 #ifdef MODULE
+#define ___module_cat(a,b) a ## b
+#define __module_cat(a,b) ___module_cat(a,b)
+/* For userspace: you can also call me... */
+#define MODULE_ALIAS(alias)					\
+	static const char __module_cat(__alias_,__LINE__)[]	\
+		__attribute__((section(".modinfo"),unused)) = "alias=" alias
 
-/* For replacement modutils, use an alias not a pointer. */
 #define MODULE_GENERIC_TABLE(gtype,name)			\
-static const unsigned long __module_##gtype##_size		\
-  __attribute__ ((unused)) = sizeof(struct gtype##_id);		\
-static const struct gtype##_id * __module_##gtype##_table	\
-  __attribute__ ((unused)) = name;				\
 extern const struct gtype##_id __mod_##gtype##_table		\
   __attribute__ ((unused, alias(__stringify(name))))
 
@@ -103,6 +104,7 @@ extern const struct gtype##_id __mod_##gtype##_table		\
 
 #else  /* !MODULE */
 
+#define MODULE_ALIAS(alias)
 #define MODULE_GENERIC_TABLE(gtype,name)
 #define THIS_MODULE ((struct module *)0)
 #define MOD_INC_USE_COUNT	do { } while (0)

include/linux/pci.h

@@ -17,6 +17,8 @@
 #ifndef LINUX_PCI_H
 #define LINUX_PCI_H
 
+#include <linux/mod_devicetable.h>
+
 /*
  * Under PCI, each device has 256 bytes of configuration address space,
  * of which the first 64 bytes are standardized as follows:
@@ -359,8 +361,6 @@ enum pci_mmap_state {
 #define DEVICE_COUNT_DMA	2
 #define DEVICE_COUNT_RESOURCE	12
 
-#define PCI_ANY_ID (~0)
-
 /*
  * The pci_dev structure is used to describe PCI devices.
  */
@@ -491,13 +491,6 @@ struct pbus_set_ranges_data
 	unsigned long prefetch_start, prefetch_end;
 };
 
-struct pci_device_id {
-	unsigned int vendor, device;		/* Vendor and device ID or PCI_ANY_ID */
-	unsigned int subvendor, subdevice;	/* Subsystem ID's or PCI_ANY_ID */
-	unsigned int class, class_mask;		/* (class,subclass,prog-if) triplet */
-	unsigned long driver_data;		/* Data private to the driver */
-};
-
 struct pci_driver {
 	struct list_head node;
 	char *name;

include/linux/usb.h

 #ifndef __LINUX_USB_H
 #define __LINUX_USB_H
 
+#include <linux/mod_devicetable.h>
 #include <linux/usb_ch9.h>
 
 #define USB_MAJOR			180
@@ -314,99 +315,6 @@ static inline int usb_make_path (struct usb_device *dev, char *buf, size_t size)
 
 /*-------------------------------------------------------------------------*/
 
-/*
- * Device table entry for "new style" table-driven USB drivers.
- * User mode code can read these tables to choose which modules to load.
- * Declare the table as a MODULE_DEVICE_TABLE.
- *
- * A probe() parameter will point to a matching entry from this table.
- * Use the driver_info field for each match to hold information tied
- * to that match:  device quirks, etc.
- *
- * Terminate the driver's table with an all-zeroes entry.
- * Use the flag values to control which fields are compared.
- */
-
-/**
- * struct usb_device_id - identifies USB devices for probing and hotplugging
- * @match_flags: Bit mask controlling of the other fields are used to match
- *	against new devices.  Any field except for driver_info may be used,
- *	although some only make sense in conjunction with other fields.
- *	This is usually set by a USB_DEVICE_*() macro, which sets all
- *	other fields in this structure except for driver_info.
- * @idVendor: USB vendor ID for a device; numbers are assigned
- *	by the USB forum to its members.
- * @idProduct: Vendor-assigned product ID.
- * @bcdDevice_lo: Low end of range of vendor-assigned product version numbers.
- *	This is also used to identify individual product versions, for
- *	a range consisting of a single device.
- * @bcdDevice_hi: High end of version number range.  The range of product
- *	versions is inclusive.
- * @bDeviceClass: Class of device; numbers are assigned
- *	by the USB forum.  Products may choose to implement classes,
- *	or be vendor-specific.  Device classes specify behavior of all
- *	the interfaces on a devices.
- * @bDeviceSubClass: Subclass of device; associated with bDeviceClass.
- * @bDeviceProtocol: Protocol of device; associated with bDeviceClass.
- * @bInterfaceClass: Class of interface; numbers are assigned
- *	by the USB forum.  Products may choose to implement classes,
- *	or be vendor-specific.  Interface classes specify behavior only
- *	of a given interface; other interfaces may support other classes.
- * @bInterfaceSubClass: Subclass of interface; associated with bInterfaceClass.
- * @bInterfaceProtocol: Protocol of interface; associated with bInterfaceClass.
- * @driver_info: Holds information used by the driver.  Usually it holds
- *	a pointer to a descriptor understood by the driver, or perhaps
- *	device flags.
- *
- * In most cases, drivers will create a table of device IDs by using
- * USB_DEVICE(), or similar macros designed for that purpose.
- * They will then export it to userspace using MODULE_DEVICE_TABLE(),
- * and provide it to the USB core through their usb_driver structure.
- *
- * See the usb_match_id() function for information about how matches are
- * performed.  Briefly, you will normally use one of several macros to help
- * construct these entries.  Each entry you provide will either identify
- * one or more specific products, or will identify a class of products
- * which have agreed to behave the same.  You should put the more specific
- * matches towards the beginning of your table, so that driver_info can
- * record quirks of specific products.
- */
-struct usb_device_id {
-	/* which fields to match against? */
-	__u16		match_flags;
-
-	/* Used for product specific matches; range is inclusive */
-	__u16		idVendor;
-	__u16		idProduct;
-	__u16		bcdDevice_lo;
-	__u16		bcdDevice_hi;
-
-	/* Used for device class matches */
-	__u8		bDeviceClass;
-	__u8		bDeviceSubClass;
-	__u8		bDeviceProtocol;
-
-	/* Used for interface class matches */
-	__u8		bInterfaceClass;
-	__u8		bInterfaceSubClass;
-	__u8		bInterfaceProtocol;
-
-	/* not matched against */
-	unsigned long	driver_info;
-};
-
-/* Some useful macros to use to create struct usb_device_id */
-#define USB_DEVICE_ID_MATCH_VENDOR		0x0001
-#define USB_DEVICE_ID_MATCH_PRODUCT		0x0002
-#define USB_DEVICE_ID_MATCH_DEV_LO		0x0004
-#define USB_DEVICE_ID_MATCH_DEV_HI		0x0008
-#define USB_DEVICE_ID_MATCH_DEV_CLASS		0x0010
-#define USB_DEVICE_ID_MATCH_DEV_SUBCLASS	0x0020
-#define USB_DEVICE_ID_MATCH_DEV_PROTOCOL	0x0040
-#define USB_DEVICE_ID_MATCH_INT_CLASS		0x0080
-#define USB_DEVICE_ID_MATCH_INT_SUBCLASS	0x0100
-#define USB_DEVICE_ID_MATCH_INT_PROTOCOL	0x0200
-
 #define USB_DEVICE_ID_MATCH_DEVICE		(USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_PRODUCT)
 #define USB_DEVICE_ID_MATCH_DEV_RANGE		(USB_DEVICE_ID_MATCH_DEV_LO | USB_DEVICE_ID_MATCH_DEV_HI)
 #define USB_DEVICE_ID_MATCH_DEVICE_AND_VERSION	(USB_DEVICE_ID_MATCH_DEVICE | USB_DEVICE_ID_MATCH_DEV_RANGE)

init/vermagic.c → include/linux/vermagic.h

@@ -16,7 +16,8 @@
 #define MODULE_ARCH_VERMAGIC ""
 #endif
 
-const char vermagic[] __attribute__((section("__vermagic"))) =
-       UTS_RELEASE " "
-       MODULE_VERMAGIC_SMP MODULE_VERMAGIC_PREEMPT MODULE_ARCH_VERMAGIC
-       "gcc-" __stringify(__GNUC__) "." __stringify(__GNUC_MINOR__);
+#define VERMAGIC_STRING 						\
+	UTS_RELEASE " "							\
+	MODULE_VERMAGIC_SMP MODULE_VERMAGIC_PREEMPT 			\
+	MODULE_ARCH_VERMAGIC 						\
+	"gcc-" __stringify(__GNUC__) "." __stringify(__GNUC_MINOR__)

init/Makefile

@@ -3,7 +3,6 @@
 #
 
 obj-y			:= main.o version.o do_mounts.o initramfs.o
-obj-$(CONFIG_MODULES)	+= vermagic.o
 
 # files to be removed upon make clean
 clean-files := ../include/linux/compile.h

kernel/module.c

@@ -30,6 +30,7 @@
 #include <linux/moduleparam.h>
 #include <linux/errno.h>
 #include <linux/err.h>
+#include <linux/vermagic.h>
 #include <asm/uaccess.h>
 #include <asm/semaphore.h>
 #include <asm/pgalloc.h>
@@ -725,6 +726,8 @@ static int obsolete_params(const char *name,
 }
 #endif /* CONFIG_OBSOLETE_MODPARM */
 
+static const char vermagic[] = VERMAGIC_STRING;
+
 #ifdef CONFIG_MODVERSIONS
 static int check_version(Elf_Shdr *sechdrs,
 			 unsigned int versindex,
@@ -768,6 +771,18 @@ static int check_version(Elf_Shdr *sechdrs,
 	return 1;
 }
 
+static inline int check_modstruct_version(Elf_Shdr *sechdrs,
+					  unsigned int versindex,
+					  struct module *mod)
+{
+	unsigned int i;
+	struct kernel_symbol_group *ksg;
+
+	if (!__find_symbol("struct_module", &ksg, &i, 1))
+		BUG();
+	return check_version(sechdrs, versindex, "struct_module", mod, ksg, i);
+}
+
 /* First part is kernel version, which we ignore. */
 static inline int same_magic(const char *amagic, const char *bmagic)
 {
@@ -786,6 +801,13 @@ static inline int check_version(Elf_Shdr *sechdrs,
 	return 1;
 }
 
+static inline int check_modstruct_version(Elf_Shdr *sechdrs,
+					  unsigned int versindex,
+					  struct module *mod)
+{
+	return 1;
+}
+
 static inline int same_magic(const char *amagic, const char *bmagic)
 {
 	return strcmp(amagic, bmagic) == 0;
@@ -1036,9 +1058,6 @@ static void set_license(struct module *mod, Elf_Shdr *sechdrs, int licenseidx)
 	}
 }
 
-/* From init/vermagic.o */
-extern char vermagic[];
-
 /* Allocate and load the module: note that size of section 0 is always
    zero, and we rely on this for optional sections. */
 static struct module *load_module(void *umod,
@@ -1185,6 +1204,12 @@ static struct module *load_module(void *umod,
 	}
 	mod = (void *)sechdrs[modindex].sh_addr;
 
+	/* Check module struct version now, before we try to use module. */
+	if (!check_modstruct_version(sechdrs, versindex, mod)) {
+		err = -ENOEXEC;
+		goto free_hdr;
+	}
+
 	/* This is allowed: modprobe --force will invalidate it. */
 	if (!vmagindex) {
 		tainted |= TAINT_FORCED_MODULE;
@@ -1455,9 +1480,9 @@ static const char *get_ksymbol(struct module *mod,
 
 	/* At worse, next value is at end of module */
 	if (within(addr, mod->module_init, mod->init_size))
-		nextval = (unsigned long)mod->module_core+mod->core_size;
+		nextval = (unsigned long)mod->module_init + mod->init_size;
 	else 
-		nextval = (unsigned long)mod->module_init+mod->init_size;
+		nextval = (unsigned long)mod->module_core + mod->core_size;
 
 	/* Scan for closest preceeding symbol, and next symbol. (ELF
            starts real symbols at 1). */
@@ -1630,3 +1655,9 @@ static int __init symbols_init(void)
 }
 
 __initcall(symbols_init);
+
+#ifdef CONFIG_MODVERSIONS
+/* Generate the signature for struct module here, too, for modversions. */
+void struct_module(struct module *mod) { return; }
+EXPORT_SYMBOL(struct_module);
+#endif

scripts/Makefile

@@ -8,11 +8,26 @@
 # docproc: 	 Preprocess .tmpl file in order to generate .sgml documentation
 # conmakehash:	 Create arrays for initializing the kernel console tables
 
-host-progs    := fixdep split-include conmakehash docproc kallsyms
-build-targets := $(host-progs)
+host-progs    := fixdep split-include conmakehash docproc kallsyms modpost \
+		 mk_elfconfig
+build-targets := $(host-progs) empty.o
+
+modpost-objs  := modpost.o file2alias.o
 
 # Let clean descend into subdirs
 subdir-	:= lxdialog kconfig
 
 # fixdep is needed to compile other host programs
 $(addprefix $(obj)/,$(filter-out fixdep,$(host-progs))): $(obj)/fixdep
+
+# dependencies on generated files need to be listed explicitly
+
+$(obj)/modpost.o $(obj)/file2alias.o: $(obj)/elfconfig.h
+
+quiet_cmd_elfconfig = MKELF   $@
+      cmd_elfconfig = $(obj)/mk_elfconfig < $< > $@
+
+$(obj)/elfconfig.h: $(obj)/empty.o $(obj)/mk_elfconfig FORCE
+	$(call if_changed,elfconfig)
+
+targets += $(obj)/elfconfig.h

scripts/Makefile.build

@@ -49,15 +49,12 @@ O_TARGET := $(obj)/built-in.o
 endif
 endif
 
-ifdef CONFIG_MODVERSIONS
-modules := $(obj-m)
-touch-module = @echo $(@:.o=.ko) > .tmp_versions/$(@F:.o=.mod)
-else
-modules := $(obj-m:.o=.ko)
-endif
+# We keep a list of all modules in $(MODVERDIR)
+
+touch-module = @echo $(@:.o=.ko) > $(MODVERDIR)/$(@F:.o=.mod)
 
 __build: $(if $(KBUILD_BUILTIN),$(O_TARGET) $(L_TARGET) $(EXTRA_TARGETS)) \
-	 $(if $(KBUILD_MODULES),$(modules)) \
+	 $(if $(KBUILD_MODULES),$(obj-m)) \
 	 $(subdir-ym) $(build-targets)
 	@:
 
@@ -155,6 +152,8 @@ cmd_cc_i_c       = $(CPP) $(c_flags)   -o $@ $<
 quiet_cmd_cc_o_c = CC $(quiet_modtag)  $@
 cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 
+# Built-in and composite module parts
+
 %.o: %.c FORCE
 ifdef CONFIG_MODVERSIONS
 	$(call if_changed_rule,vcc_o_c)
@@ -162,13 +161,14 @@ else
 	$(call if_changed_dep,cc_o_c)
 endif
 
-# For modversioning, we need to special case single-part modules
-# to mark them in $(MODVERDIR)
+# Single-part modules are special since we need to mark them in $(MODVERDIR)
 
-ifdef CONFIG_MODVERSIONS
 $(single-used-m): %.o: %.c FORCE
 	$(touch-module)
+ifdef CONFIG_MODVERSIONS
 	$(call if_changed_rule,vcc_o_c)
+else
+	$(call if_changed_dep,cc_o_c)
 endif
 
 quiet_cmd_cc_lst_c = MKLST   $@
@@ -199,7 +199,8 @@ cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
 %.o: %.S FORCE
 	$(call if_changed_dep,as_o_S)
 
-targets += $(real-objs-y) $(real-objs-m) $(EXTRA_TARGETS) $(MAKECMDGOALS)
+targets += $(real-objs-y) $(real-objs-m) $(EXTRA_TARGETS) $(MAKECMDGOALS) \
+	   $(build-targets)
 
 # Build the compiled-in targets
 # ---------------------------------------------------------------------------
@@ -267,29 +268,6 @@ $(multi-used-m) : %.o: $(multi-objs-m) FORCE
 
 targets += $(multi-used-y) $(multi-used-m)
 
-#
-# Rule to link modules ( .o -> .ko )
-#
-
-# With CONFIG_MODVERSIONS, generation of the final .ko is handled
-# by scripts/Makefile.modver
-ifndef CONFIG_MODVERSIONS
-
-quiet_cmd_link_module = LD [M]  $@
-cmd_link_module = $(LD) $(ld_flags) $(LDFLAGS_MODULE) -o $@ $< init/vermagic.o
-
-# Don't rebuilt vermagic.o unless we actually are in the init/ dir
-ifneq ($(obj),init)
-init/vermagic.o: ;
-endif
-
-$(single-used-m:.o=.ko) $(multi-used-m:.o=.ko): %.ko: %.o init/vermagic.o FORCE
-	$(call if_changed,link_module)
-
-targets += $(single-used-m:.o=.ko) $(multi-used-m:.o=.ko)
-
-endif
-
 # Compile programs on the host
 # ===========================================================================
 # host-progs := bin2hex

scripts/Makefile.modinst

@@ -2,33 +2,38 @@
 # Installing modules
 # ==========================================================================
 
-src := $(obj)
+.PHONY: __modinst
+__modinst:
 
-.PHONY: modules_install
-modules_install:
+include scripts/Makefile.lib
 
-include .config
+#
 
-include $(obj)/Makefile
+__modules := $(shell cd $(MODVERDIR); cat *.mod)
+modules := $(patsubst %.o,%.ko,$(wildcard $(__modules:.ko=.o)))
 
-include scripts/Makefile.lib
+ifneq ($(filter-out $(modules),$(__modules)),)
+  $(warning *** Uh-oh, you have stale module entries. You messed with SUBDIRS, do not complain if something goes wrong.)
+endif
 
-# ==========================================================================
+.PHONY: $(modules)
+__modinst: $(modules)
+	@:
+
+# Modules built within the kernel tree
 
 quiet_cmd_modules_install = INSTALL $(obj-m:.o=.ko)
-      cmd_modules_install = mkdir -p $(MODLIB)/kernel/$(obj); \
-			    cp $(obj-m:.o=.ko) $(MODLIB)/kernel/$(obj)
+      cmd_modules_install = mkdir -p $(MODLIB)/kernel/$(@D); \
+			    cp $@ $(MODLIB)/kernel/$(@D)
 
-modules_install: $(subdir-ym)
-ifneq ($(obj-m:.o=.ko),)
+$(filter-out ../% /%,$(modules)):
 	$(call cmd,modules_install)
-else
-	@:
-endif
 
-# Descending
-# ---------------------------------------------------------------------------
+# Modules built outside just go into extra
+
+quiet_cmd_modules_install_extra = INSTALL $(obj-m:.o=.ko)
+      cmd_modules_install_extra = mkdir -p $(MODLIB)/extra; \
+			    	  cp $@ $(MODLIB)/extra
 
-.PHONY: $(subdir-ym)
-$(subdir-ym):
-	$(Q)$(MAKE) -rR -f scripts/Makefile.modinst obj=$@
+$(filter     ../% /%,$(modules)):
+	$(call cmd,modules_install_extra)

scripts/Makefile.modver → scripts/Makefile.modpost

@@ -5,6 +5,7 @@
 .PHONY: __modversions
 __modversions:
 
+include .config
 include scripts/Makefile.lib
 
 #
@@ -26,9 +27,7 @@ quiet_cmd_ld_ko_o = LD [M]  $@
       cmd_ld_ko_o = $(LD) $(LDFLAGS) $(LDFLAGS_MODULE) -o $@ 		\
 			  $(filter-out FORCE,$^)
 
-init/vermagic.o: ;
-
-$(modules): %.ko :%.o %.ver.o init/vermagic.o FORCE
+$(modules): %.ko :%.o %.mod.o FORCE
 	$(call if_changed,ld_ko_o)
 
 targets += $(modules)
@@ -36,54 +35,31 @@ targets += $(modules)
 # Compile version info for unresolved symbols
 
 quiet_cmd_cc_o_c = CC      $@
-      cmd_cc_o_c = $(CC) $(CFLAGS) -c -o $@ $<
+      cmd_cc_o_c = $(CC) $(CFLAGS) $(CFLAGS_MODULE) -c -o $@ $<
 
-$(modules:.ko=.ver.o): %.ver.o: %.ver.c FORCE
-	$(call if_changed,cc_o_c)
+#	We have a fake dependency on compile.h to make sure that we
+#	notice if the compiler version changes under us.
 
-targets += $(modules:.ko=.ver.o)
+$(modules:.ko=.mod.o): %.mod.o: %.mod.c include/linux/compile.h FORCE
+	$(call if_changed,cc_o_c)
 
-# Generate C source with version info for unresolved symbols
+targets += $(modules:.ko=.mod.o)
 
-define rule_mkver_o_c
-	echo '  MKVER   $@';						\
-	( echo "#include <linux/module.h>";				\
-	  echo "";							\
-	  echo "static const struct modversion_info ____versions[]";	\
-	  echo "__attribute__((section(\"__versions\"))) = {"; 	\
-	  for sym in `nm -u $<`; do					\
-		grep "\"$$sym\"" .tmp_all-versions			\
-		|| echo "*** Warning: $(<:.o=.ko): \"$$sym\" unresolved!" >&2;\
-	  done;								\
-	  echo "};";							\
-	) > $@
-endef
+# All the .mod.c files are generated using the helper "modpost"
 
-$(modules:.ko=.ver.c): %.ver.c: %.o .tmp_all-versions FORCE
-	$(call if_changed_rule,mkver_o_c)
+.PHONY: __modpost
 
-targets += $(modules:.ko=.ver.c))
+$(modules:.ko=.mod.c): __modpost ;
 
 # Extract all checksums for all exported symbols
 
-export-objs := $(shell for m in vmlinux $(modules:.ko=.o); do objdump -h $$m | grep -q __ksymtab && echo $$m; done)
-
-cmd_gen-all-versions = mksyms $(export-objs)
-define rule_gen-all-versions
-	echo '  MKSYMS  $@';						\
-	for mod in $(export-objs); do					\
-		modname=`basename $$mod`;				\
-		nm $$mod 						\
-		| grep ' __crc_'					\
-		| sed "s/\([^ ]*\) A __crc_\(.*\)/{ 0x\1, \"\2\" }, \/* $$modname *\//g;s/.* w __crc_\(.*\)/{ 0x0       , \"\1\" }, \/* $$modname *\//g"; \
-	done > $@;							\
-	echo 'cmd_$@ := $(cmd_$(1))' > $(@D)/.$(@F).cmd
-endef
+quiet_cmd_modpost = MODPOST
+      cmd_modpost = scripts/modpost $^
 
-.tmp_all-versions: $(export-objs) FORCE
-	$(call if_changed_rule,gen-all-versions)
+__modpost: $(wildcard vmlinux) $(modules:.ko=.o)
+	$(call if_changed,modpost)
 
-targets += .tmp_all-versions
+targets += __modpost
 
 # Add FORCE to the prequisites of a target to force it to be always rebuilt.
 # ---------------------------------------------------------------------------

scripts/empty.c

+/* empty file to figure out endianness / word size */

scripts/file2alias.c

+/* Simple code to turn various tables in an ELF file into alias definitions.
+ * This deals with kernel datastructures where they should be
+ * dealt with: in the kernel source.
+ *
+ * Copyright 2002-2003  Rusty Russell, IBM Corporation
+ *           2003       Kai Germaschewski
+ *           
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ */
+
+#include "modpost.h"
+
+/* We use the ELF typedefs, since we can't rely on stdint.h being present. */
+
+#if KERNEL_ELFCLASS == ELFCLASS32
+typedef Elf32_Addr     kernel_ulong_t;
+#else
+typedef Elf64_Addr     kernel_ulong_t;
+#endif
+
+typedef Elf32_Word     __u32;
+typedef Elf32_Half     __u16;
+typedef unsigned char  __u8;
+
+/* Big exception to the "don't include kernel headers into userspace, which
+ * even potentially has different endianness and word sizes, since 
+ * we handle those differences explicitly below */
+#include "../include/linux/mod_devicetable.h"
+
+#define ADD(str, sep, cond, field)                              \
+do {                                                            \
+        strcat(str, sep);                                       \
+        if (cond)                                               \
+                sprintf(str + strlen(str),                      \
+                        sizeof(field) == 1 ? "%02X" :           \
+                        sizeof(field) == 2 ? "%04X" :           \
+                        sizeof(field) == 4 ? "%08X" : "",       \
+                        field);                                 \
+        else                                                    \
+                sprintf(str + strlen(str), "*");                \
+} while(0)
+
+/* Looks like "usb:vNpNdlNdhNdcNdscNdpNicNiscNipN" */
+static int do_usb_entry(const char *filename,
+			struct usb_device_id *id, char *alias)
+{
+	id->match_flags = TO_NATIVE(id->match_flags);
+	id->idVendor = TO_NATIVE(id->idVendor);
+	id->idProduct = TO_NATIVE(id->idProduct);
+	id->bcdDevice_lo = TO_NATIVE(id->bcdDevice_lo);
+	id->bcdDevice_hi = TO_NATIVE(id->bcdDevice_hi);
+
+	strcpy(alias, "usb:");
+	ADD(alias, "v", id->match_flags&USB_DEVICE_ID_MATCH_VENDOR,
+	    id->idVendor);
+	ADD(alias, "p", id->match_flags&USB_DEVICE_ID_MATCH_PRODUCT,
+	    id->idProduct);
+	ADD(alias, "dl", id->match_flags&USB_DEVICE_ID_MATCH_DEV_LO,
+	    id->bcdDevice_lo);
+	ADD(alias, "dh", id->match_flags&USB_DEVICE_ID_MATCH_DEV_HI,
+	    id->bcdDevice_hi);
+	ADD(alias, "dc", id->match_flags&USB_DEVICE_ID_MATCH_DEV_CLASS,
+	    id->bDeviceClass);
+	ADD(alias, "dsc",
+	    id->match_flags&USB_DEVICE_ID_MATCH_DEV_SUBCLASS,
+	    id->bDeviceSubClass);
+	ADD(alias, "dp",
+	    id->match_flags&USB_DEVICE_ID_MATCH_DEV_PROTOCOL,
+	    id->bDeviceProtocol);
+	ADD(alias, "ic",
+	    id->match_flags&USB_DEVICE_ID_MATCH_INT_CLASS,
+	    id->bInterfaceClass);
+	ADD(alias, "isc",
+	    id->match_flags&USB_DEVICE_ID_MATCH_INT_SUBCLASS,
+	    id->bInterfaceSubClass);
+	ADD(alias, "ip",
+	    id->match_flags&USB_DEVICE_ID_MATCH_INT_PROTOCOL,
+	    id->bInterfaceProtocol);
+	return 1;
+}
+
+/* Looks like: pci:vNdNsvNsdNcN. */
+static int do_pci_entry(const char *filename,
+			struct pci_device_id *id, char *alias)
+{
+	id->vendor = TO_NATIVE(id->vendor);
+	id->device = TO_NATIVE(id->device);
+	id->subvendor = TO_NATIVE(id->subvendor);
+	id->subdevice = TO_NATIVE(id->subdevice);
+	id->class = TO_NATIVE(id->class);
+	id->class_mask = TO_NATIVE(id->class_mask);
+
+	strcpy(alias, "pci:");
+	ADD(alias, "v", id->vendor != PCI_ANY_ID, id->vendor);
+	ADD(alias, "d", id->device != PCI_ANY_ID, id->device);
+	ADD(alias, "sv", id->subvendor != PCI_ANY_ID, id->subvendor);
+	ADD(alias, "sd", id->subdevice != PCI_ANY_ID, id->subdevice);
+	if (id->class_mask != 0 && id->class_mask != ~0) {
+		fprintf(stderr,
+			"*** Warning: Can't handle class_mask in %s:%04X\n",
+			filename, id->class_mask);
+		return 0;
+	}
+	ADD(alias, "c", id->class_mask == ~0, id->class);
+	return 1;
+}
+
+/* Ignore any prefix, eg. v850 prepends _ */
+static inline int sym_is(const char *symbol, const char *name)
+{
+	const char *match;
+
+	match = strstr(symbol, name);
+	if (!match)
+		return 0;
+	return match[strlen(symbol)] == '\0';
+}
+
+static void do_table(void *symval, unsigned long size,
+		     unsigned long id_size,
+		     void *function,
+		     struct module *mod)
+{
+	unsigned int i;
+	char alias[500];
+	int (*do_entry)(const char *, void *entry, char *alias) = function;
+
+	if (size % id_size || size < id_size) {
+		fprintf(stderr, "*** Warning: %s ids %lu bad size "
+			"(each on %lu)\n", mod->name, size, id_size);
+	}
+	/* Leave last one: it's the terminator. */
+	size -= id_size;
+
+	for (i = 0; i < size; i += id_size) {
+		if (do_entry(mod->name, symval+i, alias)) {
+			/* Always end in a wildcard, for future extension */
+			if (alias[strlen(alias)-1] != '*')
+				strcat(alias, "*");
+			buf_printf(&mod->dev_table_buf,
+				   "MODULE_ALIAS(\"%s\");\n", alias);
+		}
+	}
+}
+
+/* Create MODULE_ALIAS() statements.
+ * At this time, we cannot write the actual output C source yet,
+ * so we write into the mod->dev_table_buf buffer. */
+void handle_moddevtable(struct module *mod, struct elf_info *info,
+			Elf_Sym *sym, const char *symname)
+{
+	void *symval;
+
+	/* We're looking for a section relative symbol */
+	if (!sym->st_shndx || sym->st_shndx >= info->hdr->e_shnum)
+		return;
+
+	symval = (void *)info->hdr
+		+ info->sechdrs[sym->st_shndx].sh_offset
+		+ sym->st_value;
+
+	if (sym_is(symname, "__mod_pci_device_table"))
+		do_table(symval, sym->st_size, sizeof(struct pci_device_id),
+			 do_pci_entry, mod);
+	else if (sym_is(symname, "__mod_usb_device_table"))
+		do_table(symval, sym->st_size, sizeof(struct usb_device_id),
+			 do_usb_entry, mod);
+}
+
+/* Now add out buffered information to the generated C source */
+void add_moddevtable(struct buffer *buf, struct module *mod)
+{
+	buf_printf(buf, "\n");
+	buf_write(buf, mod->dev_table_buf.p, mod->dev_table_buf.pos);
+	free(mod->dev_table_buf.p);
+}

scripts/mk_elfconfig.c

+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <elf.h>
+
+int
+main(int argc, char **argv)
+{
+	unsigned char ei[EI_NIDENT];	
+	union { short s; char c[2]; } endian_test;
+
+	if (fread(ei, 1, EI_NIDENT, stdin) != EI_NIDENT) {
+		fprintf(stderr, "Error: input truncated\n");
+		return 1;
+	}
+	if (memcmp(ei, ELFMAG, SELFMAG) != 0) {
+		fprintf(stderr, "Error: not ELF\n");
+		return 1;
+	}
+	switch (ei[EI_CLASS]) {
+	case ELFCLASS32:
+		printf("#define KERNEL_ELFCLASS ELFCLASS32\n");
+		break;
+	case ELFCLASS64:
+		printf("#define KERNEL_ELFCLASS ELFCLASS64\n");
+		break;
+	default:
+		abort();
+	}
+	switch (ei[EI_DATA]) {
+	case ELFDATA2LSB:
+		printf("#define KERNEL_ELFDATA ELFDATA2LSB\n");
+		break;
+	case ELFDATA2MSB:
+		printf("#define KERNEL_ELFDATA ELFDATA2MSB\n");
+		break;
+	default:
+		abort();
+	}
+
+	if (sizeof(unsigned long) == 4) {
+		printf("#define HOST_ELFCLASS ELFCLASS32\n");
+	} else if (sizeof(unsigned long) == 8) {
+		printf("#define HOST_ELFCLASS ELFCLASS64\n");
+	}
+
+	endian_test.s = 0x0102;
+	if (memcmp(endian_test.c, "\x01\x02", 2) == 0)
+		printf("#define HOST_ELFDATA ELFDATA2MSB\n");
+	else if (memcmp(endian_test.c, "\x02\x01", 2) == 0)
+		printf("#define HOST_ELFDATA ELFDATA2LSB\n");
+	else
+		abort();
+
+	return 0;
+}
+

scripts/modpost.c

+/* Postprocess module symbol versions
+ *
+ * Copyright 2003       Kai Germaschewski
+ *           2002-2003  Rusty Russell, IBM Corporation
+ *
+ * Based in part on module-init-tools/depmod.c,file2alias
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ *
+ * Usage: modpost vmlinux module1.o module2.o ...
+ */
+
+#include "modpost.h"
+
+/* Are we using CONFIG_MODVERSIONS? */
+int modversions = 0;
+/* Do we have vmlinux? */
+int have_vmlinux = 0;
+
+void
+fatal(const char *fmt, ...)
+{
+	va_list arglist;
+
+	fprintf(stderr, "FATAL: ");
+
+	va_start(arglist, fmt);
+	vfprintf(stderr, fmt, arglist);
+	va_end(arglist);
+
+	exit(1);
+}
+
+void
+warn(const char *fmt, ...)
+{
+	va_list arglist;
+
+	fprintf(stderr, "WARNING: ");
+
+	va_start(arglist, fmt);
+	vfprintf(stderr, fmt, arglist);
+	va_end(arglist);
+}
+
+#define NOFAIL(ptr)	do_nofail((ptr), __FILE__, __LINE__, #ptr)
+
+void *do_nofail(void *ptr, const char *file, int line, const char *expr)
+{
+	if (!ptr) {
+		fatal("Memory allocation failure %s line %d: %s.\n",
+		      file, line, expr);
+	}
+	return ptr;
+}
+
+/* A list of all modules we processed */
+
+static struct module *modules;
+
+struct module *
+new_module(char *modname)
+{
+	struct module *mod;
+	char *p;
+	
+	/* strip trailing .o */
+	p = strstr(modname, ".o");
+	if (p)
+		*p = 0;
+
+	mod = NOFAIL(malloc(sizeof(*mod)));
+	memset(mod, 0, sizeof(*mod));
+	mod->name = modname;
+
+	/* add to list */
+	mod->next = modules;
+	modules = mod;
+
+	return mod;
+}
+
+/* A hash of all exported symbols,
+ * struct symbol is also used for lists of unresolved symbols */
+
+#define SYMBOL_HASH_SIZE 1024
+
+struct symbol {
+	struct symbol *next;
+	struct module *module;
+	unsigned int crc;
+	int crc_valid;
+	char name[0];
+};
+
+static struct symbol *symbolhash[SYMBOL_HASH_SIZE];
+
+/* This is based on the hash agorithm from gdbm, via tdb */
+static inline unsigned int tdb_hash(const char *name)
+{
+	unsigned value;	/* Used to compute the hash value.  */
+	unsigned   i;	/* Used to cycle through random values. */
+
+	/* Set the initial value from the key size. */
+	for (value = 0x238F13AF * strlen(name), i=0; name[i]; i++)
+		value = (value + (((unsigned char *)name)[i] << (i*5 % 24)));
+
+	return (1103515243 * value + 12345);
+}
+
+/* Allocate a new symbols for use in the hash of exported symbols or
+ * the list of unresolved symbols per module */
+
+struct symbol *
+alloc_symbol(const char *name)
+{
+	struct symbol *s = NOFAIL(malloc(sizeof(*s) + strlen(name) + 1));
+
+	memset(s, 0, sizeof(*s));
+	strcpy(s->name, name);
+	return s;
+}
+
+/* For the hash of exported symbols */
+
+void
+new_symbol(const char *name, struct module *module, unsigned int *crc)
+{
+	unsigned int hash;
+	struct symbol *new = alloc_symbol(name);
+
+	new->module = module;
+	if (crc) {
+		new->crc = *crc;
+		new->crc_valid = 1;
+	}
+
+	hash = tdb_hash(name) % SYMBOL_HASH_SIZE;
+	new->next = symbolhash[hash];
+	symbolhash[hash] = new;
+}
+
+struct symbol *
+find_symbol(const char *name)
+{
+	struct symbol *s;
+
+	/* For our purposes, .foo matches foo.  PPC64 needs this. */
+	if (name[0] == '.')
+		name++;
+
+	for (s = symbolhash[tdb_hash(name) % SYMBOL_HASH_SIZE]; s; s=s->next) {
+		if (strcmp(s->name, name) == 0)
+			return s;
+	}
+	return NULL;
+}
+
+/* Add an exported symbol - it may have already been added without a
+ * CRC, in this case just update the CRC */
+void
+add_exported_symbol(const char *name, struct module *module, unsigned int *crc)
+{
+	struct symbol *s = find_symbol(name);
+
+	if (!s) {
+		new_symbol(name, modules, crc);
+		return;
+	}
+	if (crc) {
+		s->crc = *crc;
+		s->crc_valid = 1;
+	}
+}
+
+void *
+grab_file(const char *filename, unsigned long *size)
+{
+	struct stat st;
+	void *map;
+	int fd;
+
+	fd = open(filename, O_RDONLY);
+	if (fd < 0) {
+		perror(filename);
+		abort();
+	}
+	if (fstat(fd, &st) != 0) {
+		perror(filename);
+		abort();
+	}
+
+	*size = st.st_size;
+	map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
+	if (mmap == MAP_FAILED) {
+		perror(filename);
+		abort();
+	}
+	close(fd);
+	return map;
+}
+
+void
+parse_elf(struct elf_info *info, const char *filename)
+{
+	unsigned int i;
+	Elf_Ehdr *hdr = info->hdr;
+	Elf_Shdr *sechdrs;
+	Elf_Sym  *sym;
+
+	hdr = grab_file(filename, &info->size);
+	info->hdr = hdr;
+	if (info->size < sizeof(*hdr))
+		goto truncated;
+
+	/* Fix endianness in ELF header */
+	hdr->e_shoff    = TO_NATIVE(hdr->e_shoff);
+	hdr->e_shstrndx = TO_NATIVE(hdr->e_shstrndx);
+	hdr->e_shnum    = TO_NATIVE(hdr->e_shnum);
+	sechdrs = (void *)hdr + hdr->e_shoff;
+	info->sechdrs = sechdrs;
+
+	/* Fix endianness in section headers */
+	for (i = 0; i < hdr->e_shnum; i++) {
+		sechdrs[i].sh_type   = TO_NATIVE(sechdrs[i].sh_type);
+		sechdrs[i].sh_offset = TO_NATIVE(sechdrs[i].sh_offset);
+		sechdrs[i].sh_size   = TO_NATIVE(sechdrs[i].sh_size);
+		sechdrs[i].sh_link   = TO_NATIVE(sechdrs[i].sh_link);
+	}
+	/* Find symbol table. */
+	for (i = 1; i < hdr->e_shnum; i++) {
+		if (sechdrs[i].sh_offset > info->size)
+			goto truncated;
+		if (sechdrs[i].sh_type != SHT_SYMTAB)
+			continue;
+
+		info->symtab_start = (void *)hdr + sechdrs[i].sh_offset;
+		info->symtab_stop  = (void *)hdr + sechdrs[i].sh_offset 
+			                         + sechdrs[i].sh_size;
+		info->strtab       = (void *)hdr + 
+			             sechdrs[sechdrs[i].sh_link].sh_offset;
+	}
+	if (!info->symtab_start) {
+		fprintf(stderr, "modpost: %s no symtab?\n", filename);
+		abort();
+	}
+	/* Fix endianness in symbols */
+	for (sym = info->symtab_start; sym < info->symtab_stop; sym++) {
+		sym->st_shndx = TO_NATIVE(sym->st_shndx);
+		sym->st_name  = TO_NATIVE(sym->st_name);
+		sym->st_value = TO_NATIVE(sym->st_value);
+		sym->st_size  = TO_NATIVE(sym->st_size);
+	}
+	return;
+
+ truncated:
+	fprintf(stderr, "modpost: %s is truncated.\n", filename);
+	abort();
+}
+
+void
+parse_elf_finish(struct elf_info *info)
+{
+	munmap(info->hdr, info->size);
+}
+
+void
+handle_modversions(struct module *mod, struct elf_info *info,
+		   Elf_Sym *sym, const char *symname)
+{
+	struct symbol *s;
+
+	switch (sym->st_shndx) {
+	case SHN_COMMON:
+		fprintf(stderr, "*** Warning: \"%s\" [%s] is COMMON symbol\n",
+			symname, mod->name);
+		break;
+	case SHN_ABS:
+		/* CRC'd symbol */
+		if (memcmp(symname, "__crc_", 6) == 0) {
+			add_exported_symbol(symname+6, mod, &sym->st_value);
+			modversions = 1;
+		}
+		break;
+	case SHN_UNDEF:
+		/* undefined symbol */
+		if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL)
+			break;
+		
+		s = alloc_symbol(symname);
+		/* add to list */
+		s->next = mod->unres;
+		mod->unres = s;
+		break;
+	default:
+		/* All exported symbols */
+		if (memcmp(symname, "__ksymtab_", 10) == 0) {
+			add_exported_symbol(symname+10, mod, NULL);
+		}
+		break;
+	}
+}
+
+void
+read_symbols(char *modname)
+{
+	const char *symname;
+	struct module *mod;
+	struct elf_info info = { };
+	struct symbol *s;
+	Elf_Sym *sym;
+
+	/* When there's no vmlinux, don't print warnings about
+	 * unresolved symbols (since there'll be too many ;) */
+	if (strcmp(modname, "vmlinux") == 0)
+		have_vmlinux = 1;
+
+	parse_elf(&info, modname);
+
+	mod = new_module(modname);
+
+	for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
+		symname = info.strtab + sym->st_name;
+
+		handle_modversions(mod, &info, sym, symname);
+		handle_moddevtable(mod, &info, sym, symname);
+	}
+	parse_elf_finish(&info);
+
+	/* Our trick to get versioning for struct_module - it's
+	 * never passed as an argument to an exported function, so
+	 * the automatic versioning doesn't pick it up, but it's really
+	 * important anyhow */
+	if (modversions) {
+		s = alloc_symbol("struct_module");
+		/* add to list */
+		s->next = mod->unres;
+		mod->unres = s;
+	}
+}
+
+#define SZ 500
+
+/* We first write the generated file into memory using the
+ * following helper, then compare to the file on disk and
+ * only update the later if anything changed */
+
+void __attribute__((format(printf, 2, 3)))
+buf_printf(struct buffer *buf, const char *fmt, ...)
+{
+	char tmp[SZ];
+	int len;
+	va_list ap;
+	
+	va_start(ap, fmt);
+	len = vsnprintf(tmp, SZ, fmt, ap);
+	if (buf->size - buf->pos < len + 1) {
+		buf->size += 128;
+		buf->p = realloc(buf->p, buf->size);
+	}
+	strncpy(buf->p + buf->pos, tmp, len + 1);
+	buf->pos += len;
+	va_end(ap);
+}
+
+void
+buf_write(struct buffer *buf, const char *s, int len)
+{
+	if (buf->size - buf->pos < len) {
+		buf->size += len;
+		buf->p = realloc(buf->p, buf->size);
+	}
+	strncpy(buf->p + buf->pos, s, len);
+	buf->pos += len;
+}
+
+/* Header for the generated file */
+
+void
+add_header(struct buffer *b)
+{
+	buf_printf(b, "#include <linux/module.h>\n");
+	buf_printf(b, "#include <linux/vermagic.h>\n");
+	buf_printf(b, "\n");
+	buf_printf(b, "const char vermagic[]\n");
+	buf_printf(b, "__attribute__((section(\"__vermagic\"))) =\n");
+	buf_printf(b, "VERMAGIC_STRING;\n");
+}
+
+/* Record CRCs for unresolved symbols */
+
+void
+add_versions(struct buffer *b, struct module *mod)
+{
+	struct symbol *s, *exp;
+
+	for (s = mod->unres; s; s = s->next) {
+		exp = find_symbol(s->name);
+		if (!exp || exp->module == mod) {
+			if (have_vmlinux)
+				fprintf(stderr, "*** Warning: \"%s\" [%s.ko] "
+				"undefined!\n",	s->name, mod->name);
+			continue;
+		}
+		s->module = exp->module;
+		s->crc_valid = exp->crc_valid;
+		s->crc = exp->crc;
+	}
+
+	if (!modversions)
+		return;
+
+	buf_printf(b, "\n");
+	buf_printf(b, "static const struct modversion_info ____versions[]\n");
+	buf_printf(b, "__attribute__((section(\"__versions\"))) = {\n");
+
+	for (s = mod->unres; s; s = s->next) {
+		if (!s->module) {
+			continue;
+		}
+		if (!s->crc_valid) {
+			fprintf(stderr, "*** Warning: \"%s\" [%s.ko] "
+				"has no CRC!\n",
+				s->name, mod->name);
+			continue;
+		}
+		buf_printf(b, "\t{ %#8x, \"%s\" },\n", s->crc, s->name);
+	}
+
+	buf_printf(b, "};\n");
+}
+
+void
+add_depends(struct buffer *b, struct module *mod, struct module *modules)
+{
+	struct symbol *s;
+	struct module *m;
+	int first = 1;
+
+	for (m = modules; m; m = m->next) {
+		if (strcmp(m->name, "vmlinux") == 0)
+			m->seen = 1;
+		else 
+			m->seen = 0;
+	}
+
+	buf_printf(b, "\n");
+	buf_printf(b, "static const char __module_depends[]\n");
+	buf_printf(b, "__attribute__((section(\".modinfo\"))) =\n");
+	buf_printf(b, "\"depends=");
+	for (s = mod->unres; s; s = s->next) {
+		if (!s->module)
+			continue;
+
+		if (s->module->seen)
+			continue;
+
+		s->module->seen = 1;
+		buf_printf(b, "%s%s", first ? "" : ",",
+			   strrchr(s->module->name, '/') + 1);
+		first = 0;
+	}
+	buf_printf(b, "\";\n");
+}
+
+void
+write_if_changed(struct buffer *b, const char *fname)
+{
+	char *tmp;
+	FILE *file;
+	struct stat st;
+
+	file = fopen(fname, "r");
+	if (!file)
+		goto write;
+
+	if (fstat(fileno(file), &st) < 0)
+		goto close_write;
+
+	if (st.st_size != b->pos)
+		goto close_write;
+
+	tmp = NOFAIL(malloc(b->pos));
+	if (fread(tmp, 1, b->pos, file) != b->pos)
+		goto free_write;
+
+	if (memcmp(tmp, b->p, b->pos) != 0)
+		goto free_write;
+
+	free(tmp);
+	fclose(file);
+	return;
+
+ free_write:
+	free(tmp);
+ close_write:
+	fclose(file);
+ write:
+	file = fopen(fname, "w");
+	if (!file) {
+		perror(fname);
+		exit(1);
+	}
+	if (fwrite(b->p, 1, b->pos, file) != b->pos) {
+		perror(fname);
+		exit(1);
+	}
+	fclose(file);
+}
+
+int
+main(int argc, char **argv)
+{
+	struct module *mod;
+	struct buffer buf = { };
+	char fname[SZ];
+
+	for (; argv[1]; argv++) {
+		read_symbols(argv[1]);
+	}
+
+	for (mod = modules; mod; mod = mod->next) {
+		if (strcmp(mod->name, "vmlinux") == 0)
+			continue;
+
+		buf.pos = 0;
+
+		add_header(&buf);
+		add_versions(&buf, mod);
+		add_depends(&buf, mod, modules);
+		add_moddevtable(&buf, mod);
+
+		sprintf(fname, "%s.mod.c", mod->name);
+		write_if_changed(&buf, fname);
+	}
+	return 0;
+}
+

scripts/modpost.h

+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <elf.h>
+
+#include "elfconfig.h"
+
+#if KERNEL_ELFCLASS == ELFCLASS32
+
+#define Elf_Ehdr    Elf32_Ehdr 
+#define Elf_Shdr    Elf32_Shdr 
+#define Elf_Sym     Elf32_Sym
+#define ELF_ST_BIND ELF32_ST_BIND
+
+#else
+
+#define Elf_Ehdr    Elf64_Ehdr 
+#define Elf_Shdr    Elf64_Shdr 
+#define Elf_Sym     Elf64_Sym
+#define ELF_ST_BIND ELF64_ST_BIND
+
+#endif
+
+#if KERNEL_ELFDATA != HOST_ELFDATA
+
+static void __endian(const void *src, void *dest, unsigned int size)
+{
+	unsigned int i;
+	for (i = 0; i < size; i++)
+		((unsigned char*)dest)[i] = ((unsigned char*)src)[size - i-1];
+}
+
+
+
+#define TO_NATIVE(x)						\
+({								\
+	typeof(x) __x;						\
+	__endian(&(x), &(__x), sizeof(__x));			\
+	__x;							\
+})
+
+#else /* endianness matches */
+
+#define TO_NATIVE(x) (x)
+
+#endif
+
+struct buffer {
+	char *p;
+	int pos;
+	int size;
+};
+
+void __attribute__((format(printf, 2, 3)))
+buf_printf(struct buffer *buf, const char *fmt, ...);
+
+void
+buf_write(struct buffer *buf, const char *s, int len);
+
+struct module {
+	struct module *next;
+	const char *name;
+	struct symbol *unres;
+	int seen;
+	struct buffer dev_table_buf;
+};
+
+struct elf_info {
+	unsigned long size;
+	Elf_Ehdr     *hdr;
+	Elf_Shdr     *sechdrs;
+	Elf_Sym      *symtab_start;
+	Elf_Sym      *symtab_stop;
+	const char   *strtab;
+};
+
+void handle_moddevtable(struct module *mod, struct elf_info *info,
+			Elf_Sym *sym, const char *symname);
+
+void add_moddevtable(struct buffer *buf, struct module *mod);