Commit:     2f79e48ae2651fff08d08dab3acf1294467c1155
Parent:     bae3f7c39dee5951bcbedeaedb6744f882a00173
Author:     Roland McGrath <[EMAIL PROTECTED]>
AuthorDate: Wed Jan 30 13:31:46 2008 +0100
Committer:  Ingo Molnar <[EMAIL PROTECTED]>
CommitDate: Wed Jan 30 13:31:46 2008 +0100

    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 <[EMAIL PROTECTED]>
    Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
    Signed-off-by: Thomas Gleixner <[EMAIL PROTECTED]>
 fs/compat_binfmt_elf.c |  131 ++++++++++++++++++++++++++++++++++++++++++++++++
 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 0000000..0adced2
--- /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 
+ * 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
+#define        ELF_PLATFORM            COMPAT_ELF_PLATFORM
+#undef ELF_HWCAP
+#define        ELF_HWCAP               COMPAT_ELF_HWCAP
+#define        ARCH_DLINFO             COMPAT_ARCH_DLINFO
+#define        ELF_ET_DYN_BASE         COMPAT_ELF_ET_DYN_BASE
+#define        ELF_PLAT_INIT           COMPAT_ELF_PLAT_INIT
+#ifdef compat_start_thread
+#undef start_thread
+#define        start_thread            compat_start_thread
+#ifdef compat_arch_setup_additional_pages
+#undef arch_setup_additional_pages
+#define        arch_setup_additional_pages compat_arch_setup_additional_pages
+ * 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"
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