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
  41 struct ppc_plt_entry {
  42         /* 16 byte jump instruction sequence (4 instructions) */
  43         unsigned int jump[4];
  44 };
  45 #endif  /* __powerpc64__ */
  46
  47
  48 struct 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
  98 int module_trampoline_target(struct module *mod, unsigned long trampoline,
  99                              unsigned long *target);
 100
 101 #ifdef CONFIG_DYNAMIC_FTRACE
 102 int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs);
 103 #else
 104 static 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 */