1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
|
/*
* Copyright 2004-2009 Analog Devices Inc.
*
* Licensed under the GPL-2 or later
*/
#define pr_fmt(fmt) "module %s: " fmt, mod->name
#include <linux/moduleloader.h>
#include <linux/elf.h>
#include <linux/vmalloc.h>
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <asm/dma.h>
#include <asm/cacheflush.h>
#include <asm/uaccess.h>
/* Transfer the section to the L1 memory */
int
module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
char *secstrings, struct module *mod)
{
/*
* XXX: sechdrs are vmalloced in kernel/module.c
* and would be vfreed just after module is loaded,
* so we hack to keep the only information we needed
* in mod->arch to correctly free L1 I/D sram later.
* NOTE: this breaks the semantic of mod->arch structure.
*/
Elf_Shdr *s, *sechdrs_end = sechdrs + hdr->e_shnum;
void *dest;
for (s = sechdrs; s < sechdrs_end; ++s) {
const char *shname = secstrings + s->sh_name;
if (s->sh_size == 0)
continue;
if (!strcmp(".l1.text", shname) ||
(!strcmp(".text", shname) &&
(hdr->e_flags & EF_BFIN_CODE_IN_L1))) {
dest = l1_inst_sram_alloc(s->sh_size);
mod->arch.text_l1 = dest;
if (dest == NULL) {
pr_err("L1 inst memory allocation failed\n");
return -1;
}
dma_memcpy(dest, (void *)s->sh_addr, s->sh_size);
} else if (!strcmp(".l1.data", shname) ||
(!strcmp(".data", shname) &&
(hdr->e_flags & EF_BFIN_DATA_IN_L1))) {
dest = l1_data_sram_alloc(s->sh_size);
mod->arch.data_a_l1 = dest;
if (dest == NULL) {
pr_err("L1 data memory allocation failed\n");
return -1;
}
memcpy(dest, (void *)s->sh_addr, s->sh_size);
} else if (!strcmp(".l1.bss", shname) ||
(!strcmp(".bss", shname) &&
(hdr->e_flags & EF_BFIN_DATA_IN_L1))) {
dest = l1_data_sram_zalloc(s->sh_size);
mod->arch.bss_a_l1 = dest;
if (dest == NULL) {
pr_err("L1 data memory allocation failed\n");
return -1;
}
} else if (!strcmp(".l1.data.B", shname)) {
dest = l1_data_B_sram_alloc(s->sh_size);
mod->arch.data_b_l1 = dest;
if (dest == NULL) {
pr_err("L1 data memory allocation failed\n");
return -1;
}
memcpy(dest, (void *)s->sh_addr, s->sh_size);
} else if (!strcmp(".l1.bss.B", shname)) {
dest = l1_data_B_sram_alloc(s->sh_size);
mod->arch.bss_b_l1 = dest;
if (dest == NULL) {
pr_err("L1 data memory allocation failed\n");
return -1;
}
memset(dest, 0, s->sh_size);
} else if (!strcmp(".l2.text", shname) ||
(!strcmp(".text", shname) &&
(hdr->e_flags & EF_BFIN_CODE_IN_L2))) {
dest = l2_sram_alloc(s->sh_size);
mod->arch.text_l2 = dest;
if (dest == NULL) {
pr_err("L2 SRAM allocation failed\n");
return -1;
}
memcpy(dest, (void *)s->sh_addr, s->sh_size);
} else if (!strcmp(".l2.data", shname) ||
(!strcmp(".data", shname) &&
(hdr->e_flags & EF_BFIN_DATA_IN_L2))) {
dest = l2_sram_alloc(s->sh_size);
mod->arch.data_l2 = dest;
if (dest == NULL) {
pr_err("L2 SRAM allocation failed\n");
return -1;
}
memcpy(dest, (void *)s->sh_addr, s->sh_size);
} else if (!strcmp(".l2.bss", shname) ||
(!strcmp(".bss", shname) &&
(hdr->e_flags & EF_BFIN_DATA_IN_L2))) {
dest = l2_sram_zalloc(s->sh_size);
mod->arch.bss_l2 = dest;
if (dest == NULL) {
pr_err("L2 SRAM allocation failed\n");
return -1;
}
} else
continue;
s->sh_flags &= ~SHF_ALLOC;
s->sh_addr = (unsigned long)dest;
}
return 0;
}
/*************************************************************************/
/* FUNCTION : apply_relocate_add */
/* ABSTRACT : Blackfin specific relocation handling for the loadable */
/* modules. Modules are expected to be .o files. */
/* Arithmetic relocations are handled. */
/* We do not expect LSETUP to be split and hence is not */
/* handled. */
/* R_BFIN_BYTE and R_BFIN_BYTE2 are also not handled as the */
/* gas does not generate it. */
/*************************************************************************/
int
apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
unsigned int symindex, unsigned int relsec,
struct module *mod)
{
unsigned int i;
Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
Elf32_Sym *sym;
unsigned long location, value, size;
pr_debug("applying relocate section %u to %u\n",
relsec, sechdrs[relsec].sh_info);
for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
/* This is where to make the change */
location = sechdrs[sechdrs[relsec].sh_info].sh_addr +
rel[i].r_offset;
/* This is the symbol it is referring to. Note that all
undefined symbols have been resolved. */
sym = (Elf32_Sym *) sechdrs[symindex].sh_addr
+ ELF32_R_SYM(rel[i].r_info);
value = sym->st_value;
value += rel[i].r_addend;
#ifdef CONFIG_SMP
if (location >= COREB_L1_DATA_A_START) {
pr_err("cannot relocate in L1: %u (SMP kernel)\n",
ELF32_R_TYPE(rel[i].r_info));
return -ENOEXEC;
}
#endif
pr_debug("location is %lx, value is %lx type is %d\n",
location, value, ELF32_R_TYPE(rel[i].r_info));
switch (ELF32_R_TYPE(rel[i].r_info)) {
case R_BFIN_HUIMM16:
value >>= 16;
case R_BFIN_LUIMM16:
case R_BFIN_RIMM16:
size = 2;
break;
case R_BFIN_BYTE4_DATA:
size = 4;
break;
case R_BFIN_PCREL24:
case R_BFIN_PCREL24_JUMP_L:
case R_BFIN_PCREL12_JUMP:
case R_BFIN_PCREL12_JUMP_S:
case R_BFIN_PCREL10:
pr_err("unsupported relocation: %u (no -mlong-calls?)\n",
ELF32_R_TYPE(rel[i].r_info));
return -ENOEXEC;
default:
pr_err("unknown relocation: %u\n",
ELF32_R_TYPE(rel[i].r_info));
return -ENOEXEC;
}
switch (bfin_mem_access_type(location, size)) {
case BFIN_MEM_ACCESS_CORE:
case BFIN_MEM_ACCESS_CORE_ONLY:
memcpy((void *)location, &value, size);
break;
case BFIN_MEM_ACCESS_DMA:
dma_memcpy((void *)location, &value, size);
break;
case BFIN_MEM_ACCESS_ITEST:
isram_memcpy((void *)location, &value, size);
break;
default:
pr_err("invalid relocation for %#lx\n", location);
return -ENOEXEC;
}
}
return 0;
}
int
module_finalize(const Elf_Ehdr * hdr,
const Elf_Shdr * sechdrs, struct module *mod)
{
unsigned int i, strindex = 0, symindex = 0;
char *secstrings;
long err = 0;
secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
for (i = 1; i < hdr->e_shnum; i++) {
/* Internal symbols and strings. */
if (sechdrs[i].sh_type == SHT_SYMTAB) {
symindex = i;
strindex = sechdrs[i].sh_link;
}
}
for (i = 1; i < hdr->e_shnum; i++) {
const char *strtab = (char *)sechdrs[strindex].sh_addr;
unsigned int info = sechdrs[i].sh_info;
const char *shname = secstrings + sechdrs[i].sh_name;
/* Not a valid relocation section? */
if (info >= hdr->e_shnum)
continue;
/* Only support RELA relocation types */
if (sechdrs[i].sh_type != SHT_RELA)
continue;
if (!strcmp(".rela.l2.text", shname) ||
!strcmp(".rela.l1.text", shname) ||
(!strcmp(".rela.text", shname) &&
(hdr->e_flags & (EF_BFIN_CODE_IN_L1 | EF_BFIN_CODE_IN_L2)))) {
err = apply_relocate_add((Elf_Shdr *) sechdrs, strtab,
symindex, i, mod);
if (err < 0)
return -ENOEXEC;
}
}
return 0;
}
void module_arch_cleanup(struct module *mod)
{
l1_inst_sram_free(mod->arch.text_l1);
l1_data_A_sram_free(mod->arch.data_a_l1);
l1_data_A_sram_free(mod->arch.bss_a_l1);
l1_data_B_sram_free(mod->arch.data_b_l1);
l1_data_B_sram_free(mod->arch.bss_b_l1);
l2_sram_free(mod->arch.text_l2);
l2_sram_free(mod->arch.data_l2);
l2_sram_free(mod->arch.bss_l2);
}
|
