include/asm-powerpc/module.h

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