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