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 further 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         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
  81 int module_trampoline_target(struct module *mod, unsigned long trampoline,
  82                              unsigned long *target);
  83
  84 #ifdef CONFIG_DYNAMIC_FTRACE
  85 int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs);
  86 #else
  87 static inline int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs)
  88 {
  89         return 0;
  90 }
  91 #endif
  92
  93 #endif /* __KERNEL__ */
  94 #endif  /* _ASM_POWERPC_MODULE_H */