[POWERPC] Switch to generic compat_binfmt_elf code

This switches the CONFIG_PPC64 support for 32-bit ELF to use the
generic fs/compat_binfmt_elf.c implementation instead of our own
binfmt_elf32.c.  Since so much is the same between 32/64, there is
only one macro we have to define to make the generic support work out
of the box.
Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/Kconfig

@@ -97,6 +97,7 @@ config EARLY_PRINTK
 config COMPAT
 	bool
 	default y if PPC64
+	select COMPAT_BINFMT_ELF
 
 config SYSVIPC_COMPAT
 	bool

arch/powerpc/kernel/Makefile

@@ -17,7 +17,7 @@ obj-y				:= semaphore.o cputable.o ptrace.o syscalls.o \
 				   init_task.o process.o systbl.o idle.o \
 				   signal.o
 obj-y				+= vdso32/
-obj-$(CONFIG_PPC64)		+= setup_64.o binfmt_elf32.o sys_ppc32.o \
+obj-$(CONFIG_PPC64)		+= setup_64.o sys_ppc32.o \
 				   signal_64.o ptrace32.o \
 				   paca.o cpu_setup_ppc970.o \
 				   cpu_setup_pa6t.o \

arch/powerpc/kernel/binfmt_elf32.c

-/*
- * binfmt_elf32.c: Support 32-bit PPC ELF binaries on Power3 and followons.
- * based on the SPARC64 version.
- * Copyright (C) 1995, 1996, 1997, 1998 David S. Miller	(davem@redhat.com)
- * Copyright (C) 1995, 1996, 1997, 1998 Jakub Jelinek	(jj@ultra.linux.cz)
- *
- * Copyright (C) 2000,2001 Ken Aaker (kdaaker@rchland.vnet.ibm.com), IBM Corp
- * Copyright (C) 2001 Anton Blanchard (anton@au.ibm.com), IBM
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#include <asm/processor.h>
-#include <linux/module.h>
-#include <linux/compat.h>
-#include <linux/elfcore-compat.h>
-
-#undef	ELF_ARCH
-#undef	ELF_CLASS
-#define ELF_CLASS	ELFCLASS32
-#define ELF_ARCH	EM_PPC
-
-#undef	elfhdr
-#undef	elf_phdr
-#undef	elf_note
-#undef	elf_addr_t
-#define elfhdr		elf32_hdr
-#define elf_phdr	elf32_phdr
-#define elf_note	elf32_note
-#define elf_addr_t	Elf32_Off
-
-#define elf_prstatus	compat_elf_prstatus
-#define elf_prpsinfo	compat_elf_prpsinfo
-
-#define elf_core_copy_regs compat_elf_core_copy_regs
-static inline void compat_elf_core_copy_regs(compat_elf_gregset_t *elf_regs,
-					     struct pt_regs *regs)
-{
-	PPC_ELF_CORE_COPY_REGS((*elf_regs), regs);
-}
-
-#define elf_core_copy_task_regs compat_elf_core_copy_task_regs
-static int compat_elf_core_copy_task_regs(struct task_struct *tsk,
-					  compat_elf_gregset_t *elf_regs)
-{
-	struct pt_regs *regs = tsk->thread.regs;
-	if (regs)
-		compat_elf_core_copy_regs(elf_regs, regs);
-	return 1;
-}
-
-#include <linux/time.h>
-
-#undef cputime_to_timeval
-#define cputime_to_timeval cputime_to_compat_timeval
-static __inline__ void
-cputime_to_compat_timeval(const cputime_t cputime, struct compat_timeval *value)
-{
-	unsigned long jiffies = cputime_to_jiffies(cputime);
-	value->tv_usec = (jiffies % HZ) * (1000000L / HZ);
-	value->tv_sec = jiffies / HZ;
-}
-
-#define init_elf_binfmt init_elf32_binfmt
-
-#include "../../../fs/binfmt_elf.c"

include/asm-powerpc/elf.h

@@ -165,6 +165,7 @@ typedef elf_vrreg_t elf_vrregset_t32[ELF_NVRREG32];
  * This is used to ensure we don't load something for the wrong architecture.
  */
 #define elf_check_arch(x) ((x)->e_machine == ELF_ARCH)
+#define compat_elf_check_arch(x)	((x)->e_machine == EM_PPC)
 
 #define USE_ELF_CORE_DUMP
 #define CORE_DUMP_USE_REGSET