1 // SPDX-License-Identifier: GPL-2.0+
2 /* Kernel module help for SH.
4 SHcompact version by Kaz Kojima and Paul Mundt.
8 Copyright 2004 SuperH (UK) Ltd
11 Based on the sh version, and on code from the sh64-specific parts of
12 modutils, originally written by Richard Curnow and Ben Gaster.
14 #include <linux/moduleloader.h>
15 #include <linux/elf.h>
16 #include <linux/vmalloc.h>
17 #include <linux/bug.h>
19 #include <linux/string.h>
20 #include <linux/kernel.h>
21 #include <asm/unaligned.h>
22 #include <asm/dwarf.h>
24 int apply_relocate_add(Elf32_Shdr *sechdrs,
26 unsigned int symindex,
31 Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
33 Elf32_Addr relocation;
37 pr_debug("Applying relocate section %u to %u\n", relsec,
38 sechdrs[relsec].sh_info);
39 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
40 /* This is where to make the change */
41 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
43 /* This is the symbol it is referring to. Note that all
44 undefined symbols have been resolved. */
45 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
46 + ELF32_R_SYM(rel[i].r_info);
47 relocation = sym->st_value + rel[i].r_addend;
49 switch (ELF32_R_TYPE(rel[i].r_info)) {
53 value = get_unaligned(location);
55 put_unaligned(value, location);
58 relocation = (relocation - (Elf32_Addr) location);
59 value = get_unaligned(location);
61 put_unaligned(value, location);
64 *location = (*location & ~0x3fffc00) |
65 ((relocation & 0xffff) << 10);
67 case R_SH_IMM_MEDLOW16:
68 *location = (*location & ~0x3fffc00) |
69 (((relocation >> 16) & 0xffff) << 10);
71 case R_SH_IMM_LOW16_PCREL:
72 relocation -= (Elf32_Addr) location;
73 *location = (*location & ~0x3fffc00) |
74 ((relocation & 0xffff) << 10);
76 case R_SH_IMM_MEDLOW16_PCREL:
77 relocation -= (Elf32_Addr) location;
78 *location = (*location & ~0x3fffc00) |
79 (((relocation >> 16) & 0xffff) << 10);
82 printk(KERN_ERR "module %s: Unknown relocation: %u\n",
83 me->name, ELF32_R_TYPE(rel[i].r_info));
90 int module_finalize(const Elf_Ehdr *hdr,
91 const Elf_Shdr *sechdrs,
96 ret |= module_dwarf_finalize(hdr, sechdrs, me);
101 void module_arch_cleanup(struct module *mod)
103 module_dwarf_cleanup(mod);