2 * File: arch/blackfin/kernel/module.c
10 * Copyright 2004-2006 Analog Devices Inc.
12 * Bugs: Enter bugs at http://blackfin.uclinux.org/
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, see the file COPYING, or write
26 * to the Free Software Foundation, Inc.,
27 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
30 #define pr_fmt(fmt) "module %s: " fmt
32 #include <linux/moduleloader.h>
33 #include <linux/elf.h>
34 #include <linux/vmalloc.h>
36 #include <linux/string.h>
37 #include <linux/kernel.h>
39 #include <asm/cacheflush.h>
40 #include <asm/uaccess.h>
42 void *module_alloc(unsigned long size)
49 /* Free memory returned from module_alloc */
50 void module_free(struct module *mod, void *module_region)
55 /* Transfer the section to the L1 memory */
57 module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
58 char *secstrings, struct module *mod)
61 * XXX: sechdrs are vmalloced in kernel/module.c
62 * and would be vfreed just after module is loaded,
63 * so we hack to keep the only information we needed
64 * in mod->arch to correctly free L1 I/D sram later.
65 * NOTE: this breaks the semantic of mod->arch structure.
67 Elf_Shdr *s, *sechdrs_end = sechdrs + hdr->e_shnum;
70 for (s = sechdrs; s < sechdrs_end; ++s) {
71 const char *shname = secstrings + s->sh_name;
76 if (!strcmp(".l1.text", shname) ||
77 (!strcmp(".text", shname) &&
78 (hdr->e_flags & EF_BFIN_CODE_IN_L1))) {
80 dest = l1_inst_sram_alloc(s->sh_size);
81 mod->arch.text_l1 = dest;
83 pr_err("L1 inst memory allocation failed\n",
87 dma_memcpy(dest, (void *)s->sh_addr, s->sh_size);
89 } else if (!strcmp(".l1.data", shname) ||
90 (!strcmp(".data", shname) &&
91 (hdr->e_flags & EF_BFIN_DATA_IN_L1))) {
93 dest = l1_data_sram_alloc(s->sh_size);
94 mod->arch.data_a_l1 = dest;
96 pr_err("L1 data memory allocation failed\n",
100 memcpy(dest, (void *)s->sh_addr, s->sh_size);
102 } else if (!strcmp(".l1.bss", shname) ||
103 (!strcmp(".bss", shname) &&
104 (hdr->e_flags & EF_BFIN_DATA_IN_L1))) {
106 dest = l1_data_sram_zalloc(s->sh_size);
107 mod->arch.bss_a_l1 = dest;
109 pr_err("L1 data memory allocation failed\n",
114 } else if (!strcmp(".l1.data.B", shname)) {
116 dest = l1_data_B_sram_alloc(s->sh_size);
117 mod->arch.data_b_l1 = dest;
119 pr_err("L1 data memory allocation failed\n",
123 memcpy(dest, (void *)s->sh_addr, s->sh_size);
125 } else if (!strcmp(".l1.bss.B", shname)) {
127 dest = l1_data_B_sram_alloc(s->sh_size);
128 mod->arch.bss_b_l1 = dest;
130 pr_err("L1 data memory allocation failed\n",
134 memset(dest, 0, s->sh_size);
136 } else if (!strcmp(".l2.text", shname) ||
137 (!strcmp(".text", shname) &&
138 (hdr->e_flags & EF_BFIN_CODE_IN_L2))) {
140 dest = l2_sram_alloc(s->sh_size);
141 mod->arch.text_l2 = dest;
143 pr_err("L2 SRAM allocation failed\n",
147 memcpy(dest, (void *)s->sh_addr, s->sh_size);
149 } else if (!strcmp(".l2.data", shname) ||
150 (!strcmp(".data", shname) &&
151 (hdr->e_flags & EF_BFIN_DATA_IN_L2))) {
153 dest = l2_sram_alloc(s->sh_size);
154 mod->arch.data_l2 = dest;
156 pr_err("L2 SRAM allocation failed\n",
160 memcpy(dest, (void *)s->sh_addr, s->sh_size);
162 } else if (!strcmp(".l2.bss", shname) ||
163 (!strcmp(".bss", shname) &&
164 (hdr->e_flags & EF_BFIN_DATA_IN_L2))) {
166 dest = l2_sram_zalloc(s->sh_size);
167 mod->arch.bss_l2 = dest;
169 pr_err("L2 SRAM allocation failed\n",
177 s->sh_flags &= ~SHF_ALLOC;
178 s->sh_addr = (unsigned long)dest;
185 apply_relocate(Elf_Shdr * sechdrs, const char *strtab,
186 unsigned int symindex, unsigned int relsec, struct module *me)
188 pr_err(".rel unsupported\n", me->name);
192 /*************************************************************************/
193 /* FUNCTION : apply_relocate_add */
194 /* ABSTRACT : Blackfin specific relocation handling for the loadable */
195 /* modules. Modules are expected to be .o files. */
196 /* Arithmetic relocations are handled. */
197 /* We do not expect LSETUP to be split and hence is not */
199 /* R_BFIN_BYTE and R_BFIN_BYTE2 are also not handled as the */
200 /* gas does not generate it. */
201 /*************************************************************************/
203 apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
204 unsigned int symindex, unsigned int relsec,
208 Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
210 unsigned long location, value, size;
212 pr_debug("applying relocate section %u to %u\n", mod->name,
213 relsec, sechdrs[relsec].sh_info);
215 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
216 /* This is where to make the change */
217 location = sechdrs[sechdrs[relsec].sh_info].sh_addr +
220 /* This is the symbol it is referring to. Note that all
221 undefined symbols have been resolved. */
222 sym = (Elf32_Sym *) sechdrs[symindex].sh_addr
223 + ELF32_R_SYM(rel[i].r_info);
224 value = sym->st_value;
225 value += rel[i].r_addend;
228 if (location >= COREB_L1_DATA_A_START) {
229 pr_err("cannot relocate in L1: %u (SMP kernel)",
230 mod->name, ELF32_R_TYPE(rel[i].r_info));
235 pr_debug("location is %lx, value is %lx type is %d\n",
236 mod->name, location, value, ELF32_R_TYPE(rel[i].r_info));
238 switch (ELF32_R_TYPE(rel[i].r_info)) {
246 case R_BFIN_BYTE4_DATA:
251 case R_BFIN_PCREL24_JUMP_L:
252 case R_BFIN_PCREL12_JUMP:
253 case R_BFIN_PCREL12_JUMP_S:
255 pr_err("unsupported relocation: %u (no -mlong-calls?)\n",
256 mod->name, ELF32_R_TYPE(rel[i].r_info));
260 pr_err("unknown relocation: %u\n", mod->name,
261 ELF32_R_TYPE(rel[i].r_info));
265 switch (bfin_mem_access_type(location, size)) {
266 case BFIN_MEM_ACCESS_CORE:
267 case BFIN_MEM_ACCESS_CORE_ONLY:
268 memcpy((void *)location, &value, size);
270 case BFIN_MEM_ACCESS_DMA:
271 dma_memcpy((void *)location, &value, size);
273 case BFIN_MEM_ACCESS_ITEST:
274 isram_memcpy((void *)location, &value, size);
277 pr_err("invalid relocation for %#lx\n",
278 mod->name, location);
287 module_finalize(const Elf_Ehdr * hdr,
288 const Elf_Shdr * sechdrs, struct module *mod)
290 unsigned int i, strindex = 0, symindex = 0;
294 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
296 for (i = 1; i < hdr->e_shnum; i++) {
297 /* Internal symbols and strings. */
298 if (sechdrs[i].sh_type == SHT_SYMTAB) {
300 strindex = sechdrs[i].sh_link;
304 for (i = 1; i < hdr->e_shnum; i++) {
305 const char *strtab = (char *)sechdrs[strindex].sh_addr;
306 unsigned int info = sechdrs[i].sh_info;
307 const char *shname = secstrings + sechdrs[i].sh_name;
309 /* Not a valid relocation section? */
310 if (info >= hdr->e_shnum)
313 /* Only support RELA relocation types */
314 if (sechdrs[i].sh_type != SHT_RELA)
317 if (!strcmp(".rela.l2.text", shname) ||
318 !strcmp(".rela.l1.text", shname) ||
319 (!strcmp(".rela.text", shname) &&
320 (hdr->e_flags & (EF_BFIN_CODE_IN_L1 | EF_BFIN_CODE_IN_L2)))) {
322 err = apply_relocate_add((Elf_Shdr *) sechdrs, strtab,
332 void module_arch_cleanup(struct module *mod)
334 l1_inst_sram_free(mod->arch.text_l1);
335 l1_data_A_sram_free(mod->arch.data_a_l1);
336 l1_data_A_sram_free(mod->arch.bss_a_l1);
337 l1_data_B_sram_free(mod->arch.data_b_l1);
338 l1_data_B_sram_free(mod->arch.bss_b_l1);
339 l2_sram_free(mod->arch.text_l2);
340 l2_sram_free(mod->arch.data_l2);
341 l2_sram_free(mod->arch.bss_l2);