1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16#include <linux/module.h>
17#include <linux/moduleloader.h>
18#include <linux/elf.h>
19#include <linux/vmalloc.h>
20#include <linux/fs.h>
21#include <linux/string.h>
22#include <linux/kernel.h>
23#include <linux/cache.h>
24
25#undef DEBUG_RELOCATE
26
27void *module_alloc(unsigned long size)
28{
29 if (size == 0)
30 return NULL;
31 return vmalloc(size);
32}
33
34void module_free(struct module *mod, void *module_region)
35{
36 vfree(module_region);
37
38
39}
40
41int module_frob_arch_sections(Elf32_Ehdr *hdr,
42 Elf32_Shdr *sechdrs,
43 char *secstrings,
44 struct module *mod)
45{
46 return 0;
47}
48
49static int
50decode_calln_opcode (unsigned char *location)
51{
52#ifdef __XTENSA_EB__
53 return (location[0] & 0xf0) == 0x50;
54#endif
55#ifdef __XTENSA_EL__
56 return (location[0] & 0xf) == 0x5;
57#endif
58}
59
60static int
61decode_l32r_opcode (unsigned char *location)
62{
63#ifdef __XTENSA_EB__
64 return (location[0] & 0xf0) == 0x10;
65#endif
66#ifdef __XTENSA_EL__
67 return (location[0] & 0xf) == 0x1;
68#endif
69}
70
71int apply_relocate(Elf32_Shdr *sechdrs,
72 const char *strtab,
73 unsigned int symindex,
74 unsigned int relsec,
75 struct module *mod)
76{
77 printk(KERN_ERR "module %s: REL RELOCATION unsupported\n",
78 mod->name);
79 return -ENOEXEC;
80
81}
82
83int apply_relocate_add(Elf32_Shdr *sechdrs,
84 const char *strtab,
85 unsigned int symindex,
86 unsigned int relsec,
87 struct module *mod)
88{
89 unsigned int i;
90 Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr;
91 Elf32_Sym *sym;
92 unsigned char *location;
93 uint32_t value;
94
95#ifdef DEBUG_RELOCATE
96 printk("Applying relocate section %u to %u\n", relsec,
97 sechdrs[relsec].sh_info);
98#endif
99 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {
100 location = (char *)sechdrs[sechdrs[relsec].sh_info].sh_addr
101 + rela[i].r_offset;
102 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
103 + ELF32_R_SYM(rela[i].r_info);
104 value = sym->st_value + rela[i].r_addend;
105
106 switch (ELF32_R_TYPE(rela[i].r_info)) {
107 case R_XTENSA_NONE:
108 case R_XTENSA_DIFF8:
109 case R_XTENSA_DIFF16:
110 case R_XTENSA_DIFF32:
111 case R_XTENSA_ASM_EXPAND:
112 break;
113
114 case R_XTENSA_32:
115 case R_XTENSA_PLT:
116 *(uint32_t *)location += value;
117 break;
118
119 case R_XTENSA_SLOT0_OP:
120 if (decode_calln_opcode(location)) {
121 value -= ((unsigned long)location & -4) + 4;
122 if ((value & 3) != 0 ||
123 ((value + (1 << 19)) >> 20) != 0) {
124 printk("%s: relocation out of range, "
125 "section %d reloc %d "
126 "sym '%s'\n",
127 mod->name, relsec, i,
128 strtab + sym->st_name);
129 return -ENOEXEC;
130 }
131 value = (signed int)value >> 2;
132#ifdef __XTENSA_EB__
133 location[0] = ((location[0] & ~0x3) |
134 ((value >> 16) & 0x3));
135 location[1] = (value >> 8) & 0xff;
136 location[2] = value & 0xff;
137#endif
138#ifdef __XTENSA_EL__
139 location[0] = ((location[0] & ~0xc0) |
140 ((value << 6) & 0xc0));
141 location[1] = (value >> 2) & 0xff;
142 location[2] = (value >> 10) & 0xff;
143#endif
144 } else if (decode_l32r_opcode(location)) {
145 value -= (((unsigned long)location + 3) & -4);
146 if ((value & 3) != 0 ||
147 (signed int)value >> 18 != -1) {
148 printk("%s: relocation out of range, "
149 "section %d reloc %d "
150 "sym '%s'\n",
151 mod->name, relsec, i,
152 strtab + sym->st_name);
153 return -ENOEXEC;
154 }
155 value = (signed int)value >> 2;
156
157#ifdef __XTENSA_EB__
158 location[1] = (value >> 8) & 0xff;
159 location[2] = value & 0xff;
160#endif
161#ifdef __XTENSA_EL__
162 location[1] = value & 0xff;
163 location[2] = (value >> 8) & 0xff;
164#endif
165 }
166
167
168
169
170
171
172
173
174
175
176
177 break;
178
179 case R_XTENSA_SLOT1_OP:
180 case R_XTENSA_SLOT2_OP:
181 case R_XTENSA_SLOT3_OP:
182 case R_XTENSA_SLOT4_OP:
183 case R_XTENSA_SLOT5_OP:
184 case R_XTENSA_SLOT6_OP:
185 case R_XTENSA_SLOT7_OP:
186 case R_XTENSA_SLOT8_OP:
187 case R_XTENSA_SLOT9_OP:
188 case R_XTENSA_SLOT10_OP:
189 case R_XTENSA_SLOT11_OP:
190 case R_XTENSA_SLOT12_OP:
191 case R_XTENSA_SLOT13_OP:
192 case R_XTENSA_SLOT14_OP:
193 printk("%s: unexpected FLIX relocation: %u\n",
194 mod->name,
195 ELF32_R_TYPE(rela[i].r_info));
196 return -ENOEXEC;
197
198 case R_XTENSA_SLOT0_ALT:
199 case R_XTENSA_SLOT1_ALT:
200 case R_XTENSA_SLOT2_ALT:
201 case R_XTENSA_SLOT3_ALT:
202 case R_XTENSA_SLOT4_ALT:
203 case R_XTENSA_SLOT5_ALT:
204 case R_XTENSA_SLOT6_ALT:
205 case R_XTENSA_SLOT7_ALT:
206 case R_XTENSA_SLOT8_ALT:
207 case R_XTENSA_SLOT9_ALT:
208 case R_XTENSA_SLOT10_ALT:
209 case R_XTENSA_SLOT11_ALT:
210 case R_XTENSA_SLOT12_ALT:
211 case R_XTENSA_SLOT13_ALT:
212 case R_XTENSA_SLOT14_ALT:
213 printk("%s: unexpected ALT relocation: %u\n",
214 mod->name,
215 ELF32_R_TYPE(rela[i].r_info));
216 return -ENOEXEC;
217
218 default:
219 printk("%s: unexpected relocation: %u\n",
220 mod->name,
221 ELF32_R_TYPE(rela[i].r_info));
222 return -ENOEXEC;
223 }
224 }
225 return 0;
226}
227
228int module_finalize(const Elf_Ehdr *hdr,
229 const Elf_Shdr *sechdrs,
230 struct module *mod)
231{
232 return 0;
233}
234
235void module_arch_cleanup(struct module *mod)
236{
237}
238
