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#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
  27struct ppc_plt_entry {
  28        /* 16 byte jump instruction sequence (4 instructions) */
  29        unsigned int jump[4];
  30};
  31#endif  /* __powerpc64__ */
  32
  33
  34struct 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        bool toc_fixed;                 /* Have we fixed up .TOC.? */
  39#ifdef CONFIG_DYNAMIC_FTRACE
  40        unsigned long toc;
  41        unsigned long tramp;
  42#endif
  43
  44#else /* powerpc64 */
  45        /* Indices of PLT sections within module. */
  46        unsigned int core_plt_section;
  47        unsigned int init_plt_section;
  48#ifdef CONFIG_DYNAMIC_FTRACE
  49        unsigned long tramp;
  50#endif
  51#endif /* powerpc64 */
  52
  53        /* List of BUG addresses, source line numbers and filenames */
  54        struct list_head bug_list;
  55        struct bug_entry *bug_table;
  56        unsigned int num_bugs;
  57};
  58
  59/*
  60 * Select ELF headers.
  61 * Make empty section for module_frob_arch_sections to expand.
  62 */
  63
  64#ifdef __powerpc64__
  65#    ifdef MODULE
  66        asm(".section .stubs,\"ax\",@nobits; .align 3; .previous");
  67#    endif
  68#else
  69#    ifdef MODULE
  70        asm(".section .plt,\"ax\",@nobits; .align 3; .previous");
  71        asm(".section .init.plt,\"ax\",@nobits; .align 3; .previous");
  72#    endif      /* MODULE */
  73#endif
  74
  75#ifdef CONFIG_DYNAMIC_FTRACE
  76#    ifdef MODULE
  77        asm(".section .ftrace.tramp,\"ax\",@nobits; .align 3; .previous");
  78#    endif      /* MODULE */
  79#endif
  80
  81bool is_module_trampoline(u32 *insns);
  82int module_trampoline_target(struct module *mod, u32 *trampoline,
  83                             unsigned long *target);
  84
  85struct exception_table_entry;
  86void sort_ex_table(struct exception_table_entry *start,
  87                   struct exception_table_entry *finish);
  88
  89#if defined(CONFIG_MODVERSIONS) && defined(CONFIG_PPC64)
  90#define ARCH_RELOCATES_KCRCTAB
  91#define reloc_start PHYSICAL_START
  92#endif
  93#endif /* __KERNEL__ */
  94#endif  /* _ASM_POWERPC_MODULE_H */
  95