1 /* Kernel module help for SH.
3 SHcompact version by Kaz Kojima and Paul Mundt.
7 Copyright 2004 SuperH (UK) Ltd
10 Based on the sh version, and on code from the sh64-specific parts of
11 modutils, originally written by Richard Curnow and Ben Gaster.
13 This program is free software; you can redistribute it and/or modify
14 it under the terms of the GNU General Public License as published by
15 the Free Software Foundation; either version 2 of the License, or
16 (at your option) any later version.
18 This program is distributed in the hope that it will be useful,
19 but WITHOUT ANY WARRANTY; without even the implied warranty of
20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 GNU General Public License for more details.
23 You should have received a copy of the GNU General Public License
24 along with this program; if not, write to the Free Software
25 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
27 #include <linux/moduleloader.h>
28 #include <linux/elf.h>
29 #include <linux/vmalloc.h>
30 #include <linux/bug.h>
32 #include <linux/string.h>
33 #include <linux/kernel.h>
34 #include <asm/unaligned.h>
35 #include <asm/dwarf.h>
37 void *module_alloc(unsigned long size)
42 return vmalloc_exec(size);
46 /* Free memory returned from module_alloc */
47 void module_free(struct module *mod, void *module_region)
52 /* We don't need anything special. */
53 int module_frob_arch_sections(Elf_Ehdr *hdr,
61 int apply_relocate_add(Elf32_Shdr *sechdrs,
63 unsigned int symindex,
68 Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
70 Elf32_Addr relocation;
74 pr_debug("Applying relocate section %u to %u\n", relsec,
75 sechdrs[relsec].sh_info);
76 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
77 /* This is where to make the change */
78 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
80 /* This is the symbol it is referring to. Note that all
81 undefined symbols have been resolved. */
82 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
83 + ELF32_R_SYM(rel[i].r_info);
84 relocation = sym->st_value + rel[i].r_addend;
86 #ifdef CONFIG_SUPERH64
87 /* For text addresses, bit2 of the st_other field indicates
88 * whether the symbol is SHmedia (1) or SHcompact (0). If
89 * SHmedia, the LSB of the symbol needs to be asserted
90 * for the CPU to be in SHmedia mode when it starts executing
91 * the branch target. */
92 relocation |= !!(sym->st_other & 4);
95 switch (ELF32_R_TYPE(rel[i].r_info)) {
99 value = get_unaligned(location);
101 put_unaligned(value, location);
104 relocation = (relocation - (Elf32_Addr) location);
105 value = get_unaligned(location);
107 put_unaligned(value, location);
110 *location = (*location & ~0x3fffc00) |
111 ((relocation & 0xffff) << 10);
113 case R_SH_IMM_MEDLOW16:
114 *location = (*location & ~0x3fffc00) |
115 (((relocation >> 16) & 0xffff) << 10);
117 case R_SH_IMM_LOW16_PCREL:
118 relocation -= (Elf32_Addr) location;
119 *location = (*location & ~0x3fffc00) |
120 ((relocation & 0xffff) << 10);
122 case R_SH_IMM_MEDLOW16_PCREL:
123 relocation -= (Elf32_Addr) location;
124 *location = (*location & ~0x3fffc00) |
125 (((relocation >> 16) & 0xffff) << 10);
128 printk(KERN_ERR "module %s: Unknown relocation: %u\n",
129 me->name, ELF32_R_TYPE(rel[i].r_info));
136 int apply_relocate(Elf32_Shdr *sechdrs,
138 unsigned int symindex,
142 printk(KERN_ERR "module %s: REL RELOCATION unsupported\n",
147 int module_finalize(const Elf_Ehdr *hdr,
148 const Elf_Shdr *sechdrs,
153 ret |= module_dwarf_finalize(hdr, sechdrs, me);
158 void module_arch_cleanup(struct module *mod)
160 module_dwarf_cleanup(mod);