include/asm-powerpc/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
  26 struct ppc_plt_entry {
  27         /* 16 byte jump instruction sequence (4 instructions) */
  28         unsigned int jump[4];
  29 };
  30 #endif  /* __powerpc64__ */
  31
  32
  33 struct 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 #else
  38         /* Indices of PLT sections within module. */
  39         unsigned int core_plt_section;
  40         unsigned int init_plt_section;
  41 #endif
  42
  43         /* List of BUG addresses, source line numbers and filenames */
  44         struct list_head bug_list;
  45         struct bug_entry *bug_table;
  46         unsigned int num_bugs;
  47 };
  48
  49 extern struct bug_entry *module_find_bug(unsigned long bugaddr);
  50
  51 /*
  52  * Select ELF headers.
  53  * Make empty section for module_frob_arch_sections to expand.
  54  */
  55
  56 #ifdef __powerpc64__
  57 #    define Elf_Shdr    Elf64_Shdr
  58 #    define Elf_Sym     Elf64_Sym
  59 #    define Elf_Ehdr    Elf64_Ehdr
  60 #    ifdef MODULE
  61         asm(".section .stubs,\"ax\",@nobits; .align 3; .previous");
  62 #    endif
  63 #else
  64 #    define Elf_Shdr    Elf32_Shdr
  65 #    define Elf_Sym     Elf32_Sym
  66 #    define Elf_Ehdr    Elf32_Ehdr
  67 #    ifdef MODULE
  68         asm(".section .plt,\"ax\",@nobits; .align 3; .previous");
  69         asm(".section .init.plt,\"ax\",@nobits; .align 3; .previous");
  70 #    endif      /* MODULE */
  71 #endif
  72
  73
  74 struct exception_table_entry;
  75 void sort_ex_table(struct exception_table_entry *start,
  76                    struct exception_table_entry *finish);
  77
  78 #endif /* __KERNEL__ */
  79 #endif  /* _ASM_POWERPC_MODULE_H */