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>
41 void *module_alloc(unsigned long size
)
48 /* Free memory returned from module_alloc */
49 void module_free(struct module
*mod
, void *module_region
)
54 /* Transfer the section to the L1 memory */
56 module_frob_arch_sections(Elf_Ehdr
* hdr
, Elf_Shdr
* sechdrs
,
57 char *secstrings
, struct module
*mod
)
60 * XXX: sechdrs are vmalloced in kernel/module.c
61 * and would be vfreed just after module is loaded,
62 * so we hack to keep the only information we needed
63 * in mod->arch to correctly free L1 I/D sram later.
64 * NOTE: this breaks the semantic of mod->arch structure.
66 Elf_Shdr
*s
, *sechdrs_end
= sechdrs
+ hdr
->e_shnum
;
69 for (s
= sechdrs
; s
< sechdrs_end
; ++s
) {
70 if ((strcmp(".l1.text", secstrings
+ s
->sh_name
) == 0) ||
71 ((strcmp(".text", secstrings
+ s
->sh_name
) == 0) &&
72 (hdr
->e_flags
& EF_BFIN_CODE_IN_L1
) && (s
->sh_size
> 0))) {
73 dest
= l1_inst_sram_alloc(s
->sh_size
);
74 mod
->arch
.text_l1
= dest
;
76 pr_err("L1 inst memory allocation failed\n",
80 dma_memcpy(dest
, (void *)s
->sh_addr
, s
->sh_size
);
81 s
->sh_flags
&= ~SHF_ALLOC
;
82 s
->sh_addr
= (unsigned long)dest
;
84 if ((strcmp(".l1.data", secstrings
+ s
->sh_name
) == 0) ||
85 ((strcmp(".data", secstrings
+ s
->sh_name
) == 0) &&
86 (hdr
->e_flags
& EF_BFIN_DATA_IN_L1
) && (s
->sh_size
> 0))) {
87 dest
= l1_data_sram_alloc(s
->sh_size
);
88 mod
->arch
.data_a_l1
= dest
;
90 pr_err("L1 data memory allocation failed\n",
94 memcpy(dest
, (void *)s
->sh_addr
, s
->sh_size
);
95 s
->sh_flags
&= ~SHF_ALLOC
;
96 s
->sh_addr
= (unsigned long)dest
;
98 if (strcmp(".l1.bss", secstrings
+ s
->sh_name
) == 0 ||
99 ((strcmp(".bss", secstrings
+ s
->sh_name
) == 0) &&
100 (hdr
->e_flags
& EF_BFIN_DATA_IN_L1
) && (s
->sh_size
> 0))) {
101 dest
= l1_data_sram_zalloc(s
->sh_size
);
102 mod
->arch
.bss_a_l1
= dest
;
104 pr_err("L1 data memory allocation failed\n",
108 s
->sh_flags
&= ~SHF_ALLOC
;
109 s
->sh_addr
= (unsigned long)dest
;
111 if (strcmp(".l1.data.B", secstrings
+ s
->sh_name
) == 0) {
112 dest
= l1_data_B_sram_alloc(s
->sh_size
);
113 mod
->arch
.data_b_l1
= dest
;
115 pr_err("L1 data memory allocation failed\n",
119 memcpy(dest
, (void *)s
->sh_addr
, s
->sh_size
);
120 s
->sh_flags
&= ~SHF_ALLOC
;
121 s
->sh_addr
= (unsigned long)dest
;
123 if (strcmp(".l1.bss.B", secstrings
+ s
->sh_name
) == 0) {
124 dest
= l1_data_B_sram_alloc(s
->sh_size
);
125 mod
->arch
.bss_b_l1
= dest
;
127 pr_err("L1 data memory allocation failed\n",
131 memset(dest
, 0, s
->sh_size
);
132 s
->sh_flags
&= ~SHF_ALLOC
;
133 s
->sh_addr
= (unsigned long)dest
;
135 if ((strcmp(".l2.text", secstrings
+ s
->sh_name
) == 0) ||
136 ((strcmp(".text", secstrings
+ s
->sh_name
) == 0) &&
137 (hdr
->e_flags
& EF_BFIN_CODE_IN_L2
) && (s
->sh_size
> 0))) {
138 dest
= l2_sram_alloc(s
->sh_size
);
139 mod
->arch
.text_l2
= dest
;
141 pr_err("L2 SRAM allocation failed\n",
145 memcpy(dest
, (void *)s
->sh_addr
, s
->sh_size
);
146 s
->sh_flags
&= ~SHF_ALLOC
;
147 s
->sh_addr
= (unsigned long)dest
;
149 if ((strcmp(".l2.data", secstrings
+ s
->sh_name
) == 0) ||
150 ((strcmp(".data", secstrings
+ s
->sh_name
) == 0) &&
151 (hdr
->e_flags
& EF_BFIN_DATA_IN_L2
) && (s
->sh_size
> 0))) {
152 dest
= l2_sram_alloc(s
->sh_size
);
153 mod
->arch
.data_l2
= dest
;
155 pr_err("L2 SRAM allocation failed\n",
159 memcpy(dest
, (void *)s
->sh_addr
, s
->sh_size
);
160 s
->sh_flags
&= ~SHF_ALLOC
;
161 s
->sh_addr
= (unsigned long)dest
;
163 if (strcmp(".l2.bss", secstrings
+ s
->sh_name
) == 0 ||
164 ((strcmp(".bss", secstrings
+ s
->sh_name
) == 0) &&
165 (hdr
->e_flags
& EF_BFIN_DATA_IN_L2
) && (s
->sh_size
> 0))) {
166 dest
= l2_sram_zalloc(s
->sh_size
);
167 mod
->arch
.bss_l2
= dest
;
169 pr_err("L2 SRAM allocation failed\n",
173 s
->sh_flags
&= ~SHF_ALLOC
;
174 s
->sh_addr
= (unsigned long)dest
;
181 apply_relocate(Elf_Shdr
* sechdrs
, const char *strtab
,
182 unsigned int symindex
, unsigned int relsec
, struct module
*me
)
184 pr_err(".rel unsupported\n", me
->name
);
188 /*************************************************************************/
189 /* FUNCTION : apply_relocate_add */
190 /* ABSTRACT : Blackfin specific relocation handling for the loadable */
191 /* modules. Modules are expected to be .o files. */
192 /* Arithmetic relocations are handled. */
193 /* We do not expect LSETUP to be split and hence is not */
195 /* R_BFIN_BYTE and R_BFIN_BYTE2 are also not handled as the */
196 /* gas does not generate it. */
197 /*************************************************************************/
199 apply_relocate_add(Elf_Shdr
* sechdrs
, const char *strtab
,
200 unsigned int symindex
, unsigned int relsec
,
205 Elf32_Rela
*rel
= (void *)sechdrs
[relsec
].sh_addr
;
207 uint32_t *location32
;
208 uint16_t *location16
;
211 pr_debug("applying relocate section %u to %u\n", mod
->name
,
212 relsec
, sechdrs
[relsec
].sh_info
);
213 for (i
= 0; i
< sechdrs
[relsec
].sh_size
/ sizeof(*rel
); i
++) {
214 /* This is where to make the change */
216 (uint16_t *) (sechdrs
[sechdrs
[relsec
].sh_info
].sh_addr
+
218 location32
= (uint32_t *) location16
;
219 /* This is the symbol it is referring to. Note that all
220 undefined symbols have been resolved. */
221 sym
= (Elf32_Sym
*) sechdrs
[symindex
].sh_addr
222 + ELF32_R_SYM(rel
[i
].r_info
);
223 value
= sym
->st_value
;
224 value
+= rel
[i
].r_addend
;
227 if ((unsigned long)location16
>= COREB_L1_DATA_A_START
) {
228 pr_err("cannot relocate in L1: %u (SMP kernel)",
229 mod
->name
, ELF32_R_TYPE(rel
[i
].r_info
));
234 pr_debug("location is %lx, value is %x type is %d\n",
235 mod
->name
, (unsigned long)location32
, value
,
236 ELF32_R_TYPE(rel
[i
].r_info
));
238 switch (ELF32_R_TYPE(rel
[i
].r_info
)) {
241 tmp
= (value
& 0xffff);
242 if ((unsigned long)location16
>= L1_CODE_START
) {
243 dma_memcpy(location16
, &tmp
, 2);
248 tmp
= ((value
>> 16) & 0xffff);
249 if ((unsigned long)location16
>= L1_CODE_START
) {
250 dma_memcpy(location16
, &tmp
, 2);
255 *location16
= (value
& 0xffff);
257 case R_BFIN_BYTE4_DATA
:
261 case R_BFIN_PCREL24_JUMP_L
:
262 case R_BFIN_PCREL12_JUMP
:
263 case R_BFIN_PCREL12_JUMP_S
:
265 pr_err("unsupported relocation: %u (no -mlong-calls?)\n",
266 mod
->name
, ELF32_R_TYPE(rel
[i
].r_info
));
269 pr_err("unknown relocation: %u\n", mod
->name
,
270 ELF32_R_TYPE(rel
[i
].r_info
));
278 module_finalize(const Elf_Ehdr
* hdr
,
279 const Elf_Shdr
* sechdrs
, struct module
*mod
)
281 unsigned int i
, strindex
= 0, symindex
= 0;
285 secstrings
= (void *)hdr
+ sechdrs
[hdr
->e_shstrndx
].sh_offset
;
287 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
288 /* Internal symbols and strings. */
289 if (sechdrs
[i
].sh_type
== SHT_SYMTAB
) {
291 strindex
= sechdrs
[i
].sh_link
;
295 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
296 const char *strtab
= (char *)sechdrs
[strindex
].sh_addr
;
297 unsigned int info
= sechdrs
[i
].sh_info
;
299 /* Not a valid relocation section? */
300 if (info
>= hdr
->e_shnum
)
303 if ((sechdrs
[i
].sh_type
== SHT_RELA
) &&
304 ((strcmp(".rela.l2.text", secstrings
+ sechdrs
[i
].sh_name
) == 0) ||
305 (strcmp(".rela.l1.text", secstrings
+ sechdrs
[i
].sh_name
) == 0) ||
306 ((strcmp(".rela.text", secstrings
+ sechdrs
[i
].sh_name
) == 0) &&
307 (hdr
->e_flags
& (EF_BFIN_CODE_IN_L1
|EF_BFIN_CODE_IN_L2
))))) {
308 err
= apply_relocate_add((Elf_Shdr
*) sechdrs
, strtab
,
317 void module_arch_cleanup(struct module
*mod
)
319 l1_inst_sram_free(mod
->arch
.text_l1
);
320 l1_data_A_sram_free(mod
->arch
.data_a_l1
);
321 l1_data_A_sram_free(mod
->arch
.bss_a_l1
);
322 l1_data_B_sram_free(mod
->arch
.data_b_l1
);
323 l1_data_B_sram_free(mod
->arch
.bss_b_l1
);
324 l2_sram_free(mod
->arch
.text_l2
);
325 l2_sram_free(mod
->arch
.data_l2
);
326 l2_sram_free(mod
->arch
.bss_l2
);
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