1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
4 * Copyright (C) 2007-2009 PetaLogix
7 #include <linux/export.h>
8 #include <linux/moduleloader.h>
9 #include <linux/kernel.h>
10 #include <linux/elf.h>
11 #include <linux/vmalloc.h>
13 #include <linux/string.h>
15 #include <asm/pgtable.h>
16 #include <asm/cacheflush.h>
18 int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab,
19 unsigned int symindex, unsigned int relsec, struct module *module)
23 Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr;
25 unsigned long int *location;
26 unsigned long int value;
28 unsigned long int old_value;
31 pr_debug("Applying add relocation section %u to %u\n",
32 relsec, sechdrs[relsec].sh_info);
34 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {
36 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr +
38 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr +
39 ELF32_R_SYM(rela[i].r_info);
40 value = sym->st_value + rela[i].r_addend;
42 switch (ELF32_R_TYPE(rela[i].r_info)) {
45 * Be careful! mb-gcc / mb-ld splits the relocs between the
46 * text and the reloc table. In general this means we must
47 * read the current contents of (*location), add any offset
48 * then store the result back in
53 old_value = *location;
54 *location = value + old_value;
56 pr_debug("R_MICROBLAZE_32 (%08lx->%08lx)\n",
65 /* Split relocs only required/used pre gcc4.1.1 */
66 old_value = ((location[0] & 0x0000FFFF) << 16) |
67 (location[1] & 0x0000FFFF);
70 location[0] = (location[0] & 0xFFFF0000) |
72 location[1] = (location[1] & 0xFFFF0000) |
75 pr_debug("R_MICROBLAZE_64 (%08lx->%08lx)\n",
80 case R_MICROBLAZE_64_PCREL:
82 old_value = (location[0] & 0xFFFF) << 16 |
83 (location[1] & 0xFFFF);
86 value -= (unsigned long int)(location) + 4;
87 location[0] = (location[0] & 0xFFFF0000) |
89 location[1] = (location[1] & 0xFFFF0000) |
91 pr_debug("R_MICROBLAZE_64_PCREL (%08lx)\n",
95 case R_MICROBLAZE_32_PCREL_LO:
96 pr_debug("R_MICROBLAZE_32_PCREL_LO\n");
99 case R_MICROBLAZE_64_NONE:
100 pr_debug("R_MICROBLAZE_64_NONE\n");
103 case R_MICROBLAZE_NONE:
104 pr_debug("R_MICROBLAZE_NONE\n");
108 pr_err("module %s: Unknown relocation: %u\n",
110 ELF32_R_TYPE(rela[i].r_info));
117 int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs,
118 struct module *module)