LXR linux/arch/powerpc/include/asm/module.h

   1/* SPDX-License-Identifier: GPL-2.0-or-later */
   2#ifndef _ASM_POWERPC_MODULE_H
   3#define _ASM_POWERPC_MODULE_H
   4#ifdef __KERNEL__
   5
   6#include <linux/list.h>
   7#include <asm/bug.h>
   8#include <asm-generic/module.h>
   9
  10#ifndef __powerpc64__
  11/*
  12 * Thanks to Paul M for explaining this.
  13 *
  14 * PPC can only do rel jumps += 32MB, and often the kernel and other
  15 * modules are further away than this.  So, we jump to a table of
  16 * trampolines attached to the module (the Procedure Linkage Table)
  17 * whenever that happens.
  18 */
  19
  20struct ppc_plt_entry {
  21        /* 16 byte jump instruction sequence (4 instructions) */
  22        unsigned int jump[4];
  23};
  24#endif  /* __powerpc64__ */
  25
  26
  27struct mod_arch_specific {
  28#ifdef __powerpc64__
  29        unsigned int stubs_section;     /* Index of stubs section in module */
  30        unsigned int toc_section;       /* What section is the TOC? */
  31        bool toc_fixed;                 /* Have we fixed up .TOC.? */
  32
  33        /* For module function descriptor dereference */
  34        unsigned long start_opd;
  35        unsigned long end_opd;
  36#else /* powerpc64 */
  37        /* Indices of PLT sections within module. */
  38        unsigned int core_plt_section;
  39        unsigned int init_plt_section;
  40#endif /* powerpc64 */
  41
  42#ifdef CONFIG_DYNAMIC_FTRACE
  43        unsigned long tramp;
  44#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
  45        unsigned long tramp_regs;
  46#endif
  47#endif
  48
  49        /* List of BUG addresses, source line numbers and filenames */
  50        struct list_head bug_list;
  51        struct bug_entry *bug_table;
  52        unsigned int num_bugs;
  53};
  54
  55/*
  56 * Select ELF headers.
  57 * Make empty section for module_frob_arch_sections to expand.
  58 */
  59
  60#ifdef __powerpc64__
  61#    ifdef MODULE
  62        asm(".section .stubs,\"ax\",@nobits; .align 3; .previous");
  63#    endif
  64#else
  65#    ifdef MODULE
  66        asm(".section .plt,\"ax\",@nobits; .align 3; .previous");
  67        asm(".section .init.plt,\"ax\",@nobits; .align 3; .previous");
  68#    endif      /* MODULE */
  69#endif
  70
  71#ifdef CONFIG_DYNAMIC_FTRACE
  72#    ifdef MODULE
  73        asm(".section .ftrace.tramp,\"ax\",@nobits; .align 3; .previous");
  74#    endif      /* MODULE */
  75
  76int module_trampoline_target(struct module *mod, unsigned long trampoline,
  77                             unsigned long *target);
  78int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs);
  79#else
  80static inline int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs)
  81{
  82        return 0;
  83}
  84#endif
  85
  86#endif /* __KERNEL__ */
  87#endif  /* _ASM_POWERPC_MODULE_H */
  88