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#ifdef CONFIG_MPROFILE_KERNEL
  18#define MODULE_ARCH_VERMAGIC_FTRACE     "mprofile-kernel "
  19#else
  20#define MODULE_ARCH_VERMAGIC_FTRACE     ""
  21#endif
  22
  23#ifdef CONFIG_RELOCATABLE
  24#define MODULE_ARCH_VERMAGIC_RELOCATABLE        "relocatable "
  25#else
  26#define MODULE_ARCH_VERMAGIC_RELOCATABLE        ""
  27#endif
  28
  29#define MODULE_ARCH_VERMAGIC MODULE_ARCH_VERMAGIC_FTRACE MODULE_ARCH_VERMAGIC_RELOCATABLE
  30
  31#ifndef __powerpc64__
  32/*
  33 * Thanks to Paul M for explaining this.
  34 *
  35 * PPC can only do rel jumps += 32MB, and often the kernel and other
  36 * modules are further away than this.  So, we jump to a table of
  37 * trampolines attached to the module (the Procedure Linkage Table)
  38 * whenever that happens.
  39 */
  40
  41struct ppc_plt_entry {
  42        /* 16 byte jump instruction sequence (4 instructions) */
  43        unsigned int jump[4];
  44};
  45#endif  /* __powerpc64__ */
  46
  47
  48struct mod_arch_specific {
  49#ifdef __powerpc64__
  50        unsigned int stubs_section;     /* Index of stubs section in module */
  51        unsigned int toc_section;       /* What section is the TOC? */
  52        bool toc_fixed;                 /* Have we fixed up .TOC.? */
  53
  54        /* For module function descriptor dereference */
  55        unsigned long start_opd;
  56        unsigned long end_opd;
  57#else /* powerpc64 */
  58        /* Indices of PLT sections within module. */
  59        unsigned int core_plt_section;
  60        unsigned int init_plt_section;
  61#endif /* powerpc64 */
  62
  63#ifdef CONFIG_DYNAMIC_FTRACE
  64        unsigned long tramp;
  65#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
  66        unsigned long tramp_regs;
  67#endif
  68#endif
  69
  70        /* List of BUG addresses, source line numbers and filenames */
  71        struct list_head bug_list;
  72        struct bug_entry *bug_table;
  73        unsigned int num_bugs;
  74};
  75
  76/*
  77 * Select ELF headers.
  78 * Make empty section for module_frob_arch_sections to expand.
  79 */
  80
  81#ifdef __powerpc64__
  82#    ifdef MODULE
  83        asm(".section .stubs,\"ax\",@nobits; .align 3; .previous");
  84#    endif
  85#else
  86#    ifdef MODULE
  87        asm(".section .plt,\"ax\",@nobits; .align 3; .previous");
  88        asm(".section .init.plt,\"ax\",@nobits; .align 3; .previous");
  89#    endif      /* MODULE */
  90#endif
  91
  92#ifdef CONFIG_DYNAMIC_FTRACE
  93#    ifdef MODULE
  94        asm(".section .ftrace.tramp,\"ax\",@nobits; .align 3; .previous");
  95#    endif      /* MODULE */
  96#endif
  97
  98int module_trampoline_target(struct module *mod, unsigned long trampoline,
  99                             unsigned long *target);
 100
 101#ifdef CONFIG_DYNAMIC_FTRACE
 102int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs);
 103#else
 104static inline int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs)
 105{
 106        return 0;
 107}
 108#endif
 109
 110#endif /* __KERNEL__ */
 111#endif  /* _ASM_POWERPC_MODULE_H */
 112