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Linux/arch/microblaze/kernel/module.c

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  1 /*
  2  * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
  3  * Copyright (C) 2007-2009 PetaLogix
  4  *
  5  * This program is free software; you can redistribute it and/or modify
  6  * it under the terms of the GNU General Public License version 2 as
  7  * published by the Free Software Foundation.
  8  */
  9 
 10 #include <linux/export.h>
 11 #include <linux/moduleloader.h>
 12 #include <linux/kernel.h>
 13 #include <linux/elf.h>
 14 #include <linux/vmalloc.h>
 15 #include <linux/fs.h>
 16 #include <linux/string.h>
 17 
 18 #include <asm/pgtable.h>
 19 #include <asm/cacheflush.h>
 20 
 21 int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab,
 22         unsigned int symindex, unsigned int relsec, struct module *module)
 23 {
 24 
 25         unsigned int i;
 26         Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr;
 27         Elf32_Sym *sym;
 28         unsigned long int *location;
 29         unsigned long int value;
 30 #if __GNUC__ < 4
 31         unsigned long int old_value;
 32 #endif
 33 
 34         pr_debug("Applying add relocation section %u to %u\n",
 35                 relsec, sechdrs[relsec].sh_info);
 36 
 37         for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {
 38 
 39                 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr +
 40                                 rela[i].r_offset;
 41                 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr +
 42                         ELF32_R_SYM(rela[i].r_info);
 43                 value = sym->st_value + rela[i].r_addend;
 44 
 45                 switch (ELF32_R_TYPE(rela[i].r_info)) {
 46 
 47                 /*
 48                  * Be careful! mb-gcc / mb-ld splits the relocs between the
 49                  * text and the reloc table. In general this means we must
 50                  * read the current contents of (*location), add any offset
 51                  * then store the result back in
 52                  */
 53 
 54                 case R_MICROBLAZE_32:
 55 #if __GNUC__ < 4
 56                         old_value = *location;
 57                         *location = value + old_value;
 58 
 59                         pr_debug("R_MICROBLAZE_32 (%08lx->%08lx)\n",
 60                                 old_value, value);
 61 #else
 62                         *location = value;
 63 #endif
 64                         break;
 65 
 66                 case R_MICROBLAZE_64:
 67 #if __GNUC__ < 4
 68                         /* Split relocs only required/used pre gcc4.1.1 */
 69                         old_value = ((location[0] & 0x0000FFFF) << 16) |
 70                                         (location[1] & 0x0000FFFF);
 71                         value += old_value;
 72 #endif
 73                         location[0] = (location[0] & 0xFFFF0000) |
 74                                         (value >> 16);
 75                         location[1] = (location[1] & 0xFFFF0000) |
 76                                         (value & 0xFFFF);
 77 #if __GNUC__ < 4
 78                         pr_debug("R_MICROBLAZE_64 (%08lx->%08lx)\n",
 79                                 old_value, value);
 80 #endif
 81                         break;
 82 
 83                 case R_MICROBLAZE_64_PCREL:
 84 #if __GNUC__ < 4
 85                         old_value = (location[0] & 0xFFFF) << 16 |
 86                                 (location[1] & 0xFFFF);
 87                         value -= old_value;
 88 #endif
 89                         value -= (unsigned long int)(location) + 4;
 90                         location[0] = (location[0] & 0xFFFF0000) |
 91                                         (value >> 16);
 92                         location[1] = (location[1] & 0xFFFF0000) |
 93                                         (value & 0xFFFF);
 94                         pr_debug("R_MICROBLAZE_64_PCREL (%08lx)\n",
 95                                 value);
 96                         break;
 97 
 98                 case R_MICROBLAZE_32_PCREL_LO:
 99                         pr_debug("R_MICROBLAZE_32_PCREL_LO\n");
100                         break;
101 
102                 case R_MICROBLAZE_64_NONE:
103                         pr_debug("R_MICROBLAZE_64_NONE\n");
104                         break;
105 
106                 case R_MICROBLAZE_NONE:
107                         pr_debug("R_MICROBLAZE_NONE\n");
108                         break;
109 
110                 default:
111                         pr_err("module %s: Unknown relocation: %u\n",
112                                 module->name,
113                                 ELF32_R_TYPE(rela[i].r_info));
114                         return -ENOEXEC;
115                 }
116         }
117         return 0;
118 }
119 
120 int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs,
121                 struct module *module)
122 {
123         flush_dcache();
124         return 0;
125 }
126 

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