Make most arch asm/module.h files use asm-generic/module.h

Use the mapping of Elf_[SPE]hdr, Elf_Addr, Elf_Sym, Elf_Dyn, Elf_Rel/Rela,
ELF_R_TYPE() and ELF_R_SYM() to either the 32-bit version or the 64-bit version
into asm-generic/module.h for all arches bar MIPS.

Also, use the generic definition mod_arch_specific where possible.

To this end, I've defined three new config bools:

 (*) HAVE_MOD_ARCH_SPECIFIC

     Arches define this if they don't want to use the empty generic
     mod_arch_specific struct.

 (*) MODULES_USE_ELF_RELA

     Arches define this if their modules can contain RELA records.  This causes
     the Elf_Rela mapping to be emitted and allows apply_relocate_add() to be
     defined by the arch rather than have the core emit an error message.

 (*) MODULES_USE_ELF_REL

     Arches define this if their modules can contain REL records.  This causes
     the Elf_Rel mapping to be emitted and allows apply_relocate() to be
     defined by the arch rather than have the core emit an error message.

Note that it is possible to allow both REL and RELA records: m68k and mips are
two arches that do this.

With this, some arch asm/module.h files can be deleted entirely and replaced
with a generic-y marker in the arch Kbuild file.

Additionally, I have removed the bits from m32r and score that handle the
unsupported type of relocation record as that's now handled centrally.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

arch/ia64/include/asm/module.h

 #ifndef _ASM_IA64_MODULE_H
 #define _ASM_IA64_MODULE_H
 
+#include <asm-generic/module.h>
+
 /*
  * IA-64-specific support for kernel module loader.
  *
@@ -29,10 +31,6 @@ struct mod_arch_specific {
 	unsigned int next_got_entry;	/* index of next available got entry */
 };
 
-#define Elf_Shdr	Elf64_Shdr
-#define Elf_Sym		Elf64_Sym
-#define Elf_Ehdr	Elf64_Ehdr
-
 #define MODULE_PROC_FAMILY	"ia64"
 #define MODULE_ARCH_VERMAGIC	MODULE_PROC_FAMILY \
 	"gcc-" __stringify(__GNUC__) "." __stringify(__GNUC_MINOR__)

arch/m32r/Kconfig

@@ -13,6 +13,7 @@ config M32R
 	select GENERIC_IRQ_SHOW
 	select GENERIC_ATOMIC64
 	select ARCH_USES_GETTIMEOFFSET
+	select MODULES_USE_ELF_RELA
 
 config SBUS
 	bool

arch/m32r/include/asm/Kbuild

 include include/asm-generic/Kbuild.asm
+
+generic-y	+= module.h

arch/m32r/include/asm/module.h

-#ifndef _ASM_M32R_MODULE_H
-#define _ASM_M32R_MODULE_H
-
-struct mod_arch_specific { };
-
-#define Elf_Shdr	Elf32_Shdr
-#define Elf_Sym		Elf32_Sym
-#define Elf_Ehdr	Elf32_Ehdr
-
-#endif /* _ASM_M32R_MODULE_H */

arch/m32r/kernel/module.c

@@ -201,18 +201,3 @@ int apply_relocate_add(Elf32_Shdr *sechdrs,
 	}
 	return 0;
 }
-
-int apply_relocate(Elf32_Shdr *sechdrs,
-		       const char *strtab,
-		       unsigned int symindex,
-		       unsigned int relsec,
-		       struct module *me)
-{
-#if 0
-	printk(KERN_ERR "module %s: REL RELOCATION unsupported\n",
-	       me->name);
-	return -ENOEXEC;
-#endif
-	return 0;
-
-}

arch/m68k/Kconfig

@@ -13,6 +13,9 @@ config M68K
 	select FPU if MMU
 	select ARCH_WANT_IPC_PARSE_VERSION
 	select ARCH_USES_GETTIMEOFFSET if MMU && !COLDFIRE
+	select HAVE_MOD_ARCH_SPECIFIC
+	select MODULES_USE_ELF_REL
+	select MODULES_USE_ELF_RELA
 
 config RWSEM_GENERIC_SPINLOCK
 	bool

arch/m68k/include/asm/module.h

 #ifndef _ASM_M68K_MODULE_H
 #define _ASM_M68K_MODULE_H
 
+#include <asm-generic/module.h>
+
 enum m68k_fixup_type {
 	m68k_fixup_memoffset,
 	m68k_fixup_vnode_shift,
@@ -36,8 +38,4 @@ struct module;
 extern void module_fixup(struct module *mod, struct m68k_fixup_info *start,
 			 struct m68k_fixup_info *end);
 
-#define Elf_Shdr Elf32_Shdr
-#define Elf_Sym Elf32_Sym
-#define Elf_Ehdr Elf32_Ehdr
-
 #endif /* _ASM_M68K_MODULE_H */

arch/microblaze/Kconfig

@@ -24,6 +24,7 @@ config MICROBLAZE
 	select GENERIC_CPU_DEVICES
 	select GENERIC_ATOMIC64
 	select GENERIC_CLOCKEVENTS
+	select MODULES_USE_ELF_RELA
 
 config SWAP
 	def_bool n

arch/mips/Kconfig

@@ -36,6 +36,9 @@ config MIPS
 	select BUILDTIME_EXTABLE_SORT
 	select GENERIC_CLOCKEVENTS
 	select GENERIC_CMOS_UPDATE
+	select HAVE_MOD_ARCH_SPECIFIC
+	select MODULES_USE_ELF_REL
+	select MODULES_USE_ELF_RELA if 64BIT
 
 menu "Machine selection"
 

arch/mips/include/asm/module.h

@@ -35,11 +35,14 @@ typedef struct {
 } Elf64_Mips_Rela;
 
 #ifdef CONFIG_32BIT
-
 #define Elf_Shdr	Elf32_Shdr
 #define Elf_Sym		Elf32_Sym
 #define Elf_Ehdr	Elf32_Ehdr
 #define Elf_Addr	Elf32_Addr
+#define Elf_Rel		Elf32_Rel
+#define Elf_Rela	Elf32_Rela
+#define ELF_R_TYPE(X)	ELF32_R_TYPE(X)
+#define ELF_R_SYM(X)	ELF32_R_SYM(X)
 
 #define Elf_Mips_Rel	Elf32_Rel
 #define Elf_Mips_Rela	Elf32_Rela
@@ -50,11 +53,14 @@ typedef struct {
 #endif
 
 #ifdef CONFIG_64BIT
-
 #define Elf_Shdr	Elf64_Shdr
 #define Elf_Sym		Elf64_Sym
 #define Elf_Ehdr	Elf64_Ehdr
 #define Elf_Addr	Elf64_Addr
+#define Elf_Rel		Elf64_Rel
+#define Elf_Rela	Elf64_Rela
+#define ELF_R_TYPE(X)	ELF64_R_TYPE(X)
+#define ELF_R_SYM(X)	ELF64_R_SYM(X)
 
 #define Elf_Mips_Rel	Elf64_Mips_Rel
 #define Elf_Mips_Rela	Elf64_Mips_Rela

arch/mips/kernel/Makefile

@@ -31,7 +31,7 @@ obj-$(CONFIG_SYNC_R4K)		+= sync-r4k.o
 
 obj-$(CONFIG_STACKTRACE)	+= stacktrace.o
 obj-$(CONFIG_MODULES)		+= mips_ksyms.o module.o
-obj-$(CONFIG_MODULES)		+= module-rela.o
+obj-$(CONFIG_MODULES_USE_ELF_RELA) += module-rela.o
 
 obj-$(CONFIG_FUNCTION_TRACER)	+= mcount.o ftrace.o
 

arch/mn10300/Kconfig

@@ -8,6 +8,7 @@ config MN10300
 	select HAVE_ARCH_KGDB
 	select HAVE_NMI_WATCHDOG if MN10300_WD_TIMER
 	select GENERIC_CLOCKEVENTS
+	select MODULES_USE_ELF_RELA
 
 config AM33_2
 	def_bool n

arch/mn10300/include/asm/module.h

@@ -12,12 +12,7 @@
 #ifndef _ASM_MODULE_H
 #define _ASM_MODULE_H
 
-struct mod_arch_specific {
-};
-
-#define Elf_Shdr	Elf32_Shdr
-#define Elf_Sym		Elf32_Sym
-#define Elf_Ehdr	Elf32_Ehdr
+#include <asm-generic/module.h>
 
 /*
  * Include the MN10300 architecture version.

arch/openrisc/Kconfig

@@ -21,6 +21,7 @@ config OPENRISC
 	select GENERIC_CLOCKEVENTS
 	select GENERIC_STRNCPY_FROM_USER
 	select GENERIC_STRNLEN_USER
+	select MODULES_USE_ELF_RELA
 
 config MMU
 	def_bool y

arch/parisc/Kconfig

@@ -19,6 +19,8 @@ config PARISC
 	select ARCH_HAVE_NMI_SAFE_CMPXCHG
 	select GENERIC_SMP_IDLE_THREAD
 	select GENERIC_STRNCPY_FROM_USER
+	select HAVE_MOD_ARCH_SPECIFIC
+	select MODULES_USE_ELF_RELA
 
 	help
 	  The PA-RISC microprocessor is designed by Hewlett-Packard and used

arch/parisc/include/asm/module.h

 #ifndef _ASM_PARISC_MODULE_H
 #define _ASM_PARISC_MODULE_H
+
+#include <asm-generic/module.h>
+
 /*
  * This file contains the parisc architecture specific module code.
  */
-#ifdef CONFIG_64BIT
-#define Elf_Shdr Elf64_Shdr
-#define Elf_Sym Elf64_Sym
-#define Elf_Ehdr Elf64_Ehdr
-#define Elf_Addr Elf64_Addr
-#define Elf_Rela Elf64_Rela
-#else
-#define Elf_Shdr Elf32_Shdr
-#define Elf_Sym Elf32_Sym
-#define Elf_Ehdr Elf32_Ehdr
-#define Elf_Addr Elf32_Addr
-#define Elf_Rela Elf32_Rela
-#endif
 
 struct unwind_table;
 

arch/powerpc/Kconfig

@@ -139,6 +139,8 @@ config PPC
 	select GENERIC_CLOCKEVENTS
 	select GENERIC_STRNCPY_FROM_USER
 	select GENERIC_STRNLEN_USER
+	select HAVE_MOD_ARCH_SPECIFIC
+	select MODULES_USE_ELF_RELA
 
 config EARLY_PRINTK
 	bool

arch/powerpc/include/asm/module.h

@@ -11,6 +11,7 @@
 
 #include <linux/list.h>
 #include <asm/bug.h>
+#include <asm-generic/module.h>
 
 
 #ifndef __powerpc64__
@@ -60,16 +61,10 @@ struct mod_arch_specific {
  */
 
 #ifdef __powerpc64__
-#    define Elf_Shdr	Elf64_Shdr
-#    define Elf_Sym	Elf64_Sym
-#    define Elf_Ehdr	Elf64_Ehdr
 #    ifdef MODULE
 	asm(".section .stubs,\"ax\",@nobits; .align 3; .previous");
 #    endif
 #else
-#    define Elf_Shdr	Elf32_Shdr
-#    define Elf_Sym	Elf32_Sym
-#    define Elf_Ehdr	Elf32_Ehdr
 #    ifdef MODULE
 	asm(".section .plt,\"ax\",@nobits; .align 3; .previous");
 	asm(".section .init.plt,\"ax\",@nobits; .align 3; .previous");

arch/s390/Kconfig

@@ -125,6 +125,8 @@ config S390
 	select GENERIC_CLOCKEVENTS
 	select KTIME_SCALAR if 32BIT
 	select HAVE_ARCH_SECCOMP_FILTER
+	select HAVE_MOD_ARCH_SPECIFIC
+	select MODULES_USE_ELF_RELA
 
 config SCHED_OMIT_FRAME_POINTER
 	def_bool y

arch/s390/include/asm/module.h

 #ifndef _ASM_S390_MODULE_H
 #define _ASM_S390_MODULE_H
+
+#include <asm-generic/module.h>
+
 /*
  * This file contains the s390 architecture specific module code.
  */
@@ -28,19 +31,4 @@ struct mod_arch_specific
 	struct mod_arch_syminfo *syminfo;
 };
 
-#ifdef CONFIG_64BIT
-#define ElfW(x) Elf64_ ## x
-#define ELFW(x) ELF64_ ## x
-#else
-#define ElfW(x) Elf32_ ## x
-#define ELFW(x) ELF32_ ## x
-#endif
-
-#define Elf_Addr ElfW(Addr)
-#define Elf_Rela ElfW(Rela)
-#define Elf_Shdr ElfW(Shdr)
-#define Elf_Sym ElfW(Sym)
-#define Elf_Ehdr ElfW(Ehdr)
-#define ELF_R_SYM ELFW(R_SYM)
-#define ELF_R_TYPE ELFW(R_TYPE)
 #endif /* _ASM_S390_MODULE_H */