1 /* Kernel module help for sh64.
3 This program is free software; you can redistribute it and/or modify
4 it under the terms of the GNU General Public License as published by
5 the Free Software Foundation; either version 2 of the License, or
6 (at your option) any later version.
8 This program is distributed in the hope that it will be useful,
9 but WITHOUT ANY WARRANTY; without even the implied warranty of
10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 GNU General Public License for more details.
13 You should have received a copy of the GNU General Public License
14 along with this program; if not, write to the Free Software
15 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 Copyright 2004 SuperH (UK) Ltd
18 Author: Richard Curnow
20 Based on the sh version, and on code from the sh64-specific parts of
21 modutils, originally written by Richard Curnow and Ben Gaster.
24 #include <linux/moduleloader.h>
25 #include <linux/elf.h>
26 #include <linux/vmalloc.h>
28 #include <linux/string.h>
29 #include <linux/kernel.h>
34 #define DEBUGP(fmt...)
37 void *module_alloc(unsigned long size)
45 /* Free memory returned from module_alloc */
46 void module_free(struct module *mod, void *module_region)
49 /* FIXME: If module_region == mod->init_region, trim exception
53 /* We don't need anything special. */
54 int module_frob_arch_sections(Elf_Ehdr *hdr,
62 int apply_relocate_add(Elf32_Shdr *sechdrs,
64 unsigned int symindex,
69 Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
71 Elf32_Addr relocation;
76 DEBUGP("Applying relocate section %u to %u\n", relsec,
77 sechdrs[relsec].sh_info);
78 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
79 /* This is where to make the change */
80 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
82 /* This is the symbol it is referring to. Note that all
83 undefined symbols have been resolved. */
84 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
85 + ELF32_R_SYM(rel[i].r_info);
86 relocation = sym->st_value + rel[i].r_addend;
87 align = (int)location & 3;
89 /* For text addresses, bit2 of the st_other field indicates
90 * whether the symbol is SHmedia (1) or SHcompact (0). If
91 * SHmedia, the LSB of the symbol needs to be asserted
92 * for the CPU to be in SHmedia mode when it starts executing
93 * the branch target. */
94 is_shmedia = (sym->st_other & 4) ? 1 : 0;
99 switch (ELF32_R_TYPE(rel[i].r_info)) {
101 DEBUGP("R_SH_DIR32 @%08lx = %08lx\n", (unsigned long) location, (unsigned long) relocation);
102 *location += relocation;
105 DEBUGP("R_SH_REL32 @%08lx = %08lx\n", (unsigned long) location, (unsigned long) relocation);
106 relocation -= (Elf32_Addr) location;
107 *location += relocation;
110 DEBUGP("R_SH_IMM_LOW16 @%08lx = %08lx\n", (unsigned long) location, (unsigned long) relocation);
111 *location = (*location & ~0x3fffc00) |
112 ((relocation & 0xffff) << 10);
114 case R_SH_IMM_MEDLOW16:
115 DEBUGP("R_SH_IMM_MEDLOW16 @%08lx = %08lx\n", (unsigned long) location, (unsigned long) relocation);
116 *location = (*location & ~0x3fffc00) |
117 (((relocation >> 16) & 0xffff) << 10);
119 case R_SH_IMM_LOW16_PCREL:
120 DEBUGP("R_SH_IMM_LOW16_PCREL @%08lx = %08lx\n", (unsigned long) location, (unsigned long) relocation);
121 relocation -= (Elf32_Addr) location;
122 *location = (*location & ~0x3fffc00) |
123 ((relocation & 0xffff) << 10);
125 case R_SH_IMM_MEDLOW16_PCREL:
126 DEBUGP("R_SH_IMM_MEDLOW16_PCREL @%08lx = %08lx\n", (unsigned long) location, (unsigned long) relocation);
127 relocation -= (Elf32_Addr) location;
128 *location = (*location & ~0x3fffc00) |
129 (((relocation >> 16) & 0xffff) << 10);
132 printk(KERN_ERR "module %s: Unknown relocation: %u\n",
133 me->name, ELF32_R_TYPE(rel[i].r_info));
140 int apply_relocate(Elf32_Shdr *sechdrs,
142 unsigned int symindex,
146 printk(KERN_ERR "module %s: REL RELOCATION unsupported\n",
151 int module_finalize(const Elf_Ehdr *hdr,
152 const Elf_Shdr *sechdrs,
158 void module_arch_cleanup(struct module *mod)