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 #include <asm-generic/module.h>
  15
  16
  17 #ifndef __powerpc64__
  18 /*
  19  * Thanks to Paul M for explaining this.
  20  *
  21  * PPC can only do rel jumps += 32MB, and often the kernel and other
  22  * modules are furthur away than this.  So, we jump to a table of
  23  * trampolines attached to the module (the Procedure Linkage Table)
  24  * whenever that happens.
  25  */
  26
  27 struct ppc_plt_entry {
  28         /* 16 byte jump instruction sequence (4 instructions) */
  29         unsigned int jump[4];
  30 };
  31 #endif  /* __powerpc64__ */
  32
  33
  34 struct mod_arch_specific {
  35 #ifdef __powerpc64__
  36         unsigned int stubs_section;     /* Index of stubs section in module */
  37         unsigned int toc_section;       /* What section is the TOC? */
  38 #ifdef CONFIG_DYNAMIC_FTRACE
  39         unsigned long toc;
  40         unsigned long tramp;
  41 #endif
  42
  43 #else /* powerpc64 */
  44         /* Indices of PLT sections within module. */
  45         unsigned int core_plt_section;
  46         unsigned int init_plt_section;
  47 #ifdef CONFIG_DYNAMIC_FTRACE
  48         unsigned long tramp;
  49 #endif
  50 #endif /* powerpc64 */
  51
  52         /* List of BUG addresses, source line numbers and filenames */
  53         struct list_head bug_list;
  54         struct bug_entry *bug_table;
  55         unsigned int num_bugs;
  56 };
  57
  58 /*
  59  * Select ELF headers.
  60  * Make empty section for module_frob_arch_sections to expand.
  61  */
  62
  63 #ifdef __powerpc64__
  64 #    ifdef MODULE
  65         asm(".section .stubs,\"ax\",@nobits; .align 3; .previous");
  66 #    endif
  67 #else
  68 #    ifdef MODULE
  69         asm(".section .plt,\"ax\",@nobits; .align 3; .previous");
  70         asm(".section .init.plt,\"ax\",@nobits; .align 3; .previous");
  71 #    endif      /* MODULE */
  72 #endif
  73
  74 #ifdef CONFIG_DYNAMIC_FTRACE
  75 #    ifdef MODULE
  76         asm(".section .ftrace.tramp,\"ax\",@nobits; .align 3; .previous");
  77 #    endif      /* MODULE */
  78 #endif
  79
  80
  81 struct exception_table_entry;
  82 void sort_ex_table(struct exception_table_entry *start,
  83                    struct exception_table_entry *finish);
  84
  85 #ifdef CONFIG_MODVERSIONS
  86 #define ARCH_RELOCATES_KCRCTAB
  87
  88 extern const unsigned long reloc_start[];
  89 #endif
  90 #endif /* __KERNEL__ */
  91 #endif  /* _ASM_POWERPC_MODULE_H */