compat_binfmt_elf.c 3.4 KB

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  1. /*
  2. * 32-bit compatibility support for ELF format executables and core dumps.
  3. *
  4. * Copyright (C) 2007 Red Hat, Inc. All rights reserved.
  5. *
  6. * This copyrighted material is made available to anyone wishing to use,
  7. * modify, copy, or redistribute it subject to the terms and conditions
  8. * of the GNU General Public License v.2.
  9. *
  10. * Red Hat Author: Roland McGrath.
  11. *
  12. * This file is used in a 64-bit kernel that wants to support 32-bit ELF.
  13. * asm/elf.h is responsible for defining the compat_* and COMPAT_* macros
  14. * used below, with definitions appropriate for 32-bit ABI compatibility.
  15. *
  16. * We use macros to rename the ABI types and machine-dependent
  17. * functions used in binfmt_elf.c to compat versions.
  18. */
  19. #include <linux/elfcore-compat.h>
  20. #include <linux/time.h>
  21. /*
  22. * Rename the basic ELF layout types to refer to the 32-bit class of files.
  23. */
  24. #undef ELF_CLASS
  25. #define ELF_CLASS ELFCLASS32
  26. #undef elfhdr
  27. #undef elf_phdr
  28. #undef elf_shdr
  29. #undef elf_note
  30. #undef elf_addr_t
  31. #define elfhdr elf32_hdr
  32. #define elf_phdr elf32_phdr
  33. #define elf_shdr elf32_shdr
  34. #define elf_note elf32_note
  35. #define elf_addr_t Elf32_Addr
  36. /*
  37. * Some data types as stored in coredump.
  38. */
  39. #define user_long_t compat_long_t
  40. #define user_siginfo_t compat_siginfo_t
  41. #define copy_siginfo_to_user copy_siginfo_to_user32
  42. /*
  43. * The machine-dependent core note format types are defined in elfcore-compat.h,
  44. * which requires asm/elf.h to define compat_elf_gregset_t et al.
  45. */
  46. #define elf_prstatus compat_elf_prstatus
  47. #define elf_prpsinfo compat_elf_prpsinfo
  48. #undef ns_to_timeval
  49. #define ns_to_timeval ns_to_compat_timeval
  50. /*
  51. * To use this file, asm/elf.h must define compat_elf_check_arch.
  52. * The other following macros can be defined if the compat versions
  53. * differ from the native ones, or omitted when they match.
  54. */
  55. #undef ELF_ARCH
  56. #undef elf_check_arch
  57. #define elf_check_arch compat_elf_check_arch
  58. #ifdef COMPAT_ELF_PLATFORM
  59. #undef ELF_PLATFORM
  60. #define ELF_PLATFORM COMPAT_ELF_PLATFORM
  61. #endif
  62. #ifdef COMPAT_ELF_HWCAP
  63. #undef ELF_HWCAP
  64. #define ELF_HWCAP COMPAT_ELF_HWCAP
  65. #endif
  66. #ifdef COMPAT_ELF_HWCAP2
  67. #undef ELF_HWCAP2
  68. #define ELF_HWCAP2 COMPAT_ELF_HWCAP2
  69. #endif
  70. #ifdef COMPAT_ARCH_DLINFO
  71. #undef ARCH_DLINFO
  72. #define ARCH_DLINFO COMPAT_ARCH_DLINFO
  73. #endif
  74. #ifdef COMPAT_ELF_ET_DYN_BASE
  75. #undef ELF_ET_DYN_BASE
  76. #define ELF_ET_DYN_BASE COMPAT_ELF_ET_DYN_BASE
  77. #endif
  78. #ifdef COMPAT_ELF_EXEC_PAGESIZE
  79. #undef ELF_EXEC_PAGESIZE
  80. #define ELF_EXEC_PAGESIZE COMPAT_ELF_EXEC_PAGESIZE
  81. #endif
  82. #ifdef COMPAT_ELF_PLAT_INIT
  83. #undef ELF_PLAT_INIT
  84. #define ELF_PLAT_INIT COMPAT_ELF_PLAT_INIT
  85. #endif
  86. #ifdef COMPAT_SET_PERSONALITY
  87. #undef SET_PERSONALITY
  88. #define SET_PERSONALITY COMPAT_SET_PERSONALITY
  89. #endif
  90. #ifdef compat_start_thread
  91. #undef start_thread
  92. #define start_thread compat_start_thread
  93. #endif
  94. #ifdef compat_arch_setup_additional_pages
  95. #undef ARCH_HAS_SETUP_ADDITIONAL_PAGES
  96. #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
  97. #undef arch_setup_additional_pages
  98. #define arch_setup_additional_pages compat_arch_setup_additional_pages
  99. #endif
  100. /*
  101. * Rename a few of the symbols that binfmt_elf.c will define.
  102. * These are all local so the names don't really matter, but it
  103. * might make some debugging less confusing not to duplicate them.
  104. */
  105. #define elf_format compat_elf_format
  106. #define init_elf_binfmt init_compat_elf_binfmt
  107. #define exit_elf_binfmt exit_compat_elf_binfmt
  108. /*
  109. * We share all the actual code with the native (64-bit) version.
  110. */
  111. #include "binfmt_elf.c"