LXR linux/arch/powerpc/include/asm/module.h

   1#ifndef _ASM_POWERPC_MODULE_H
   2#define _ASM_POWERPC_MODULE_H
   3#ifdef __KERNEL__
   4
   5/*
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public License
   8 * as published by the Free Software Foundation; either version
   9 * 2 of the License, or (at your option) any later version.
  10 */
  11
  12#include <linux/list.h>
  13#include <asm/bug.h>
  14
  15
  16#ifndef __powerpc64__
  17/*
  18 * Thanks to Paul M for explaining this.
  19 *
  20 * PPC can only do rel jumps += 32MB, and often the kernel and other
  21 * modules are furthur away than this.  So, we jump to a table of
  22 * trampolines attached to the module (the Procedure Linkage Table)
  23 * whenever that happens.
  24 */
  25
  26struct ppc_plt_entry {
  27        /* 16 byte jump instruction sequence (4 instructions) */
  28        unsigned int jump[4];
  29};
  30#endif  /* __powerpc64__ */
  31
  32
  33struct mod_arch_specific {
  34#ifdef __powerpc64__
  35        unsigned int stubs_section;     /* Index of stubs section in module */
  36        unsigned int toc_section;       /* What section is the TOC? */
  37#ifdef CONFIG_DYNAMIC_FTRACE
  38        unsigned long toc;
  39        unsigned long tramp;
  40#endif
  41
  42#else /* powerpc64 */
  43        /* Indices of PLT sections within module. */
  44        unsigned int core_plt_section;
  45        unsigned int init_plt_section;
  46#ifdef CONFIG_DYNAMIC_FTRACE
  47        unsigned long tramp;
  48#endif
  49#endif /* powerpc64 */
  50
  51        /* List of BUG addresses, source line numbers and filenames */
  52        struct list_head bug_list;
  53        struct bug_entry *bug_table;
  54        unsigned int num_bugs;
  55};
  56
  57/*
  58 * Select ELF headers.
  59 * Make empty section for module_frob_arch_sections to expand.
  60 */
  61
  62#ifdef __powerpc64__
  63#    define Elf_Shdr    Elf64_Shdr
  64#    define Elf_Sym     Elf64_Sym
  65#    define Elf_Ehdr    Elf64_Ehdr
  66#    ifdef MODULE
  67        asm(".section .stubs,\"ax\",@nobits; .align 3; .previous");
  68#    endif
  69#else
  70#    define Elf_Shdr    Elf32_Shdr
  71#    define Elf_Sym     Elf32_Sym
  72#    define Elf_Ehdr    Elf32_Ehdr
  73#    ifdef MODULE
  74        asm(".section .plt,\"ax\",@nobits; .align 3; .previous");
  75        asm(".section .init.plt,\"ax\",@nobits; .align 3; .previous");
  76#    endif      /* MODULE */
  77#endif
  78
  79#ifdef CONFIG_DYNAMIC_FTRACE
  80#    ifdef MODULE
  81        asm(".section .ftrace.tramp,\"ax\",@nobits; .align 3; .previous");
  82#    endif      /* MODULE */
  83#endif
  84
  85
  86struct exception_table_entry;
  87void sort_ex_table(struct exception_table_entry *start,
  88                   struct exception_table_entry *finish);
  89
  90#ifdef CONFIG_MODVERSIONS
  91#define ARCH_RELOCATES_KCRCTAB
  92
  93extern const unsigned long reloc_start[];
  94#endif
  95#endif /* __KERNEL__ */
  96#endif  /* _ASM_POWERPC_MODULE_H */
  97