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/*
   7 */
   8
   9#include <linux/list.h>
  10#include <asm/bug.h>
  11#include <asm-generic/module.h>
  12
  13
  14#ifdef CONFIG_MPROFILE_KERNEL
  15#define MODULE_ARCH_VERMAGIC_FTRACE     "mprofile-kernel "
  16#else
  17#define MODULE_ARCH_VERMAGIC_FTRACE     ""
  18#endif
  19
  20#ifdef CONFIG_RELOCATABLE
  21#define MODULE_ARCH_VERMAGIC_RELOCATABLE        "relocatable "
  22#else
  23#define MODULE_ARCH_VERMAGIC_RELOCATABLE        ""
  24#endif
  25
  26#define MODULE_ARCH_VERMAGIC MODULE_ARCH_VERMAGIC_FTRACE MODULE_ARCH_VERMAGIC_RELOCATABLE
  27
  28#ifndef __powerpc64__
  29/*
  30 * Thanks to Paul M for explaining this.
  31 *
  32 * PPC can only do rel jumps += 32MB, and often the kernel and other
  33 * modules are further away than this.  So, we jump to a table of
  34 * trampolines attached to the module (the Procedure Linkage Table)
  35 * whenever that happens.
  36 */
  37
  38struct ppc_plt_entry {
  39        /* 16 byte jump instruction sequence (4 instructions) */
  40        unsigned int jump[4];
  41};
  42#endif  /* __powerpc64__ */
  43
  44
  45struct mod_arch_specific {
  46#ifdef __powerpc64__
  47        unsigned int stubs_section;     /* Index of stubs section in module */
  48        unsigned int toc_section;       /* What section is the TOC? */
  49        bool toc_fixed;                 /* Have we fixed up .TOC.? */
  50
  51        /* For module function descriptor dereference */
  52        unsigned long start_opd;
  53        unsigned long end_opd;
  54#else /* powerpc64 */
  55        /* Indices of PLT sections within module. */
  56        unsigned int core_plt_section;
  57        unsigned int init_plt_section;
  58#endif /* powerpc64 */
  59
  60#ifdef CONFIG_DYNAMIC_FTRACE
  61        unsigned long tramp;
  62#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
  63        unsigned long tramp_regs;
  64#endif
  65#endif
  66
  67        /* List of BUG addresses, source line numbers and filenames */
  68        struct list_head bug_list;
  69        struct bug_entry *bug_table;
  70        unsigned int num_bugs;
  71};
  72
  73/*
  74 * Select ELF headers.
  75 * Make empty section for module_frob_arch_sections to expand.
  76 */
  77
  78#ifdef __powerpc64__
  79#    ifdef MODULE
  80        asm(".section .stubs,\"ax\",@nobits; .align 3; .previous");
  81#    endif
  82#else
  83#    ifdef MODULE
  84        asm(".section .plt,\"ax\",@nobits; .align 3; .previous");
  85        asm(".section .init.plt,\"ax\",@nobits; .align 3; .previous");
  86#    endif      /* MODULE */
  87#endif
  88
  89#ifdef CONFIG_DYNAMIC_FTRACE
  90#    ifdef MODULE
  91        asm(".section .ftrace.tramp,\"ax\",@nobits; .align 3; .previous");
  92#    endif      /* MODULE */
  93#endif
  94
  95int module_trampoline_target(struct module *mod, unsigned long trampoline,
  96                             unsigned long *target);
  97
  98#ifdef CONFIG_DYNAMIC_FTRACE
  99int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs);
 100#else
 101static inline int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs)
 102{
 103        return 0;
 104}
 105#endif
 106
 107#endif /* __KERNEL__ */
 108#endif  /* _ASM_POWERPC_MODULE_H */
 109