x86: compat_binfmt_elf

This adds fs/compat_binfmt_elf.c, a wrapper around fs/binfmt_elf.c for
32-bit ELF support on 64-bit kernels.  It can replace all the hand-rolled
versions of this that each 32/64 arch has, which are all about the same.

To use this, an arch's asm/elf.h has to define at least a few compat_*
macros that parallel the various macros that fs/binfmt_elf.c uses for
native support.

There is no attempt to deal with compat macros for the core dump format
support.  To use this file, the arch has to define compat_gregset_t for
linux/elfcore-compat.h and #define CORE_DUMP_USE_REGSET.  The 32-bit
compatible formats should come automatically from task_user_regset_view
called on a 32-bit task.

Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 131 insertions, 0 deletions

diff --git a/fs/compat_binfmt_elf.c b/fs/compat_binfmt_elf.c
new file mode 100644
index 000000000000..0adced2f296f
--- /dev/null
+++ b/fs/compat_binfmt_elf.c
@@ -0,0 +1,131 @@
+/*
+ * 32-bit compatibility support for ELF format executables and core dumps.
+ *
+ * Copyright (C) 2007 Red Hat, Inc.  All rights reserved.
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU General Public License v.2.
+ *
+ * Red Hat Author: Roland McGrath.
+ *
+ * This file is used in a 64-bit kernel that wants to support 32-bit ELF.
+ * asm/elf.h is responsible for defining the compat_* and COMPAT_* macros
+ * used below, with definitions appropriate for 32-bit ABI compatibility.
+ *
+ * We use macros to rename the ABI types and machine-dependent
+ * functions used in binfmt_elf.c to compat versions.
+ */
+
+#include <linux/elfcore-compat.h>
+#include <linux/time.h>
+
+/*
+ * Rename the basic ELF layout types to refer to the 32-bit class of files.
+ */
+#undef  ELF_CLASS
+#define ELF_CLASS       ELFCLASS32
+
+#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_Addr
+
+/*
+ * The machine-dependent core note format types are defined in elfcore-compat.h,
+ * which requires asm/elf.h to define compat_elf_gregset_t et al.
+ */
+#define elf_prstatus    compat_elf_prstatus
+#define elf_prpsinfo    compat_elf_prpsinfo
+
+/*
+ * Compat version of cputime_to_compat_timeval, perhaps this
+ * should be an inline in <linux/compat.h>.
+ */
+static void cputime_to_compat_timeval(const cputime_t cputime,
+                                      struct compat_timeval *value)
+{
+        struct timeval tv;
+        cputime_to_timeval(cputime, &tv);
+        value->tv_sec = tv.tv_sec;
+        value->tv_usec = tv.tv_usec;
+}
+
+#undef cputime_to_timeval
+#define cputime_to_timeval cputime_to_compat_timeval
+
+
+/*
+ * To use this file, asm/elf.h must define compat_elf_check_arch.
+ * The other following macros can be defined if the compat versions
+ * differ from the native ones, or omitted when they match.
+ */
+
+#undef  ELF_ARCH
+#undef  elf_check_arch
+#define elf_check_arch  compat_elf_check_arch
+
+#ifdef  COMPAT_ELF_PLATFORM
+#undef  ELF_PLATFORM
+#define ELF_PLATFORM            COMPAT_ELF_PLATFORM
+#endif
+
+#ifdef  COMPAT_ELF_HWCAP
+#undef  ELF_HWCAP
+#define ELF_HWCAP               COMPAT_ELF_HWCAP
+#endif
+
+#ifdef  COMPAT_ARCH_DLINFO
+#undef  ARCH_DLINFO
+#define ARCH_DLINFO             COMPAT_ARCH_DLINFO
+#endif
+
+#ifdef  COMPAT_ELF_ET_DYN_BASE
+#undef  ELF_ET_DYN_BASE
+#define ELF_ET_DYN_BASE         COMPAT_ELF_ET_DYN_BASE
+#endif
+
+#ifdef COMPAT_ELF_EXEC_PAGESIZE
+#undef  ELF_EXEC_PAGESIZE
+#define ELF_EXEC_PAGESIZE       COMPAT_ELF_EXEC_PAGESIZE
+#endif
+
+#ifdef  COMPAT_ELF_PLAT_INIT
+#undef  ELF_PLAT_INIT
+#define ELF_PLAT_INIT           COMPAT_ELF_PLAT_INIT
+#endif
+
+#ifdef  COMPAT_SET_PERSONALITY
+#undef  SET_PERSONALITY
+#define SET_PERSONALITY         COMPAT_SET_PERSONALITY
+#endif
+
+#ifdef  compat_start_thread
+#undef  start_thread
+#define start_thread            compat_start_thread
+#endif
+
+#ifdef  compat_arch_setup_additional_pages
+#undef  ARCH_HAS_SETUP_ADDITIONAL_PAGES
+#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
+#undef  arch_setup_additional_pages
+#define arch_setup_additional_pages compat_arch_setup_additional_pages
+#endif
+
+/*
+ * Rename a few of the symbols that binfmt_elf.c will define.
+ * These are all local so the names don't really matter, but it
+ * might make some debugging less confusing not to duplicate them.
+ */
+#define elf_format              compat_elf_format
+#define init_elf_binfmt         init_compat_elf_binfmt
+#define exit_elf_binfmt         exit_compat_elf_binfmt
+
+/*
+ * We share all the actual code with the native (64-bit) version.
+ */
+#include "binfmt_elf.c"