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
  38 struct ppc_plt_entry {
  39         /* 16 byte jump instruction sequence (4 instructions) */
  40         unsigned int jump[4];
  41 };
  42 #endif  /* __powerpc64__ */
  43
  44
  45 struct 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
  95 int module_trampoline_target(struct module *mod, unsigned long trampoline,
  96                              unsigned long *target);
  97
  98 #ifdef CONFIG_DYNAMIC_FTRACE
  99 int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs);
 100 #else
 101 static 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 */