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
  20 struct ppc_plt_entry {
  21         /* 16 byte jump instruction sequence (4 instructions) */
  22         unsigned int jump[4];
  23 };
  24 #endif  /* __powerpc64__ */
  25
  26
  27 struct 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 #endif
  76
  77 int module_trampoline_target(struct module *mod, unsigned long trampoline,
  78                              unsigned long *target);
  79
  80 #ifdef CONFIG_DYNAMIC_FTRACE
  81 int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs);
  82 #else
  83 static inline int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs)
  84 {
  85         return 0;
  86 }
  87 #endif
  88
  89 #endif /* __KERNEL__ */
  90 #endif  /* _ASM_POWERPC_MODULE_H */