This source file includes following definitions.
- module_alloc
- module_free
- module_frob_arch_sections
- do_reloc16
- do_reloc32
- exceed_limit
- apply_relocate_add
- module_finalize
- module_arch_cleanup
1
2
3
4 #include <linux/module.h>
5 #include <linux/elf.h>
6 #include <linux/vmalloc.h>
7 #include <linux/moduleloader.h>
8 #include <asm/pgtable.h>
9
10 void *module_alloc(unsigned long size)
11 {
12 return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END,
13 GFP_KERNEL, PAGE_KERNEL, 0, NUMA_NO_NODE,
14 __builtin_return_address(0));
15 }
16
17 void module_free(struct module *module, void *region)
18 {
19 vfree(region);
20 }
21
22 int module_frob_arch_sections(Elf_Ehdr * hdr,
23 Elf_Shdr * sechdrs,
24 char *secstrings, struct module *mod)
25 {
26 return 0;
27 }
28
29 void do_reloc16(unsigned int val, unsigned int *loc, unsigned int val_mask,
30 unsigned int val_shift, unsigned int loc_mask,
31 unsigned int partial_in_place, unsigned int swap)
32 {
33 unsigned int tmp = 0, tmp2 = 0;
34
35 __asm__ __volatile__("\tlhi.bi\t%0, [%2], 0\n"
36 "\tbeqz\t%3, 1f\n"
37 "\twsbh\t%0, %1\n"
38 "1:\n":"=r"(tmp):"0"(tmp), "r"(loc), "r"(swap)
39 );
40
41 tmp2 = tmp & loc_mask;
42 if (partial_in_place) {
43 tmp &= (~loc_mask);
44 tmp =
45 tmp2 | ((tmp + ((val & val_mask) >> val_shift)) & val_mask);
46 } else {
47 tmp = tmp2 | ((val & val_mask) >> val_shift);
48 }
49
50 __asm__ __volatile__("\tbeqz\t%3, 2f\n"
51 "\twsbh\t%0, %1\n"
52 "2:\n"
53 "\tshi.bi\t%0, [%2], 0\n":"=r"(tmp):"0"(tmp),
54 "r"(loc), "r"(swap)
55 );
56 }
57
58 void do_reloc32(unsigned int val, unsigned int *loc, unsigned int val_mask,
59 unsigned int val_shift, unsigned int loc_mask,
60 unsigned int partial_in_place, unsigned int swap)
61 {
62 unsigned int tmp = 0, tmp2 = 0;
63
64 __asm__ __volatile__("\tlmw.bi\t%0, [%2], %0, 0\n"
65 "\tbeqz\t%3, 1f\n"
66 "\twsbh\t%0, %1\n"
67 "\trotri\t%0, %1, 16\n"
68 "1:\n":"=r"(tmp):"0"(tmp), "r"(loc), "r"(swap)
69 );
70
71 tmp2 = tmp & loc_mask;
72 if (partial_in_place) {
73 tmp &= (~loc_mask);
74 tmp =
75 tmp2 | ((tmp + ((val & val_mask) >> val_shift)) & val_mask);
76 } else {
77 tmp = tmp2 | ((val & val_mask) >> val_shift);
78 }
79
80 __asm__ __volatile__("\tbeqz\t%3, 2f\n"
81 "\twsbh\t%0, %1\n"
82 "\trotri\t%0, %1, 16\n"
83 "2:\n"
84 "\tsmw.bi\t%0, [%2], %0, 0\n":"=r"(tmp):"0"(tmp),
85 "r"(loc), "r"(swap)
86 );
87 }
88
89 static inline int exceed_limit(int offset, unsigned int val_mask,
90 struct module *module, Elf32_Rela * rel,
91 unsigned int relindex, unsigned int reloc_order)
92 {
93 int abs_off = offset < 0 ? ~offset : offset;
94
95 if (abs_off & (~val_mask)) {
96 pr_err("\n%s: relocation type %d out of range.\n"
97 "please rebuild the kernel module with gcc option \"-Wa,-mno-small-text\".\n",
98 module->name, ELF32_R_TYPE(rel->r_info));
99 pr_err("section %d reloc %d offset 0x%x relative 0x%x.\n",
100 relindex, reloc_order, rel->r_offset, offset);
101 return true;
102 }
103 return false;
104 }
105
106 #ifdef __NDS32_EL__
107 #define NEED_SWAP 1
108 #else
109 #define NEED_SWAP 0
110 #endif
111
112 int
113 apply_relocate_add(Elf32_Shdr * sechdrs, const char *strtab,
114 unsigned int symindex, unsigned int relindex,
115 struct module *module)
116 {
117 Elf32_Shdr *symsec = sechdrs + symindex;
118 Elf32_Shdr *relsec = sechdrs + relindex;
119 Elf32_Shdr *dstsec = sechdrs + relsec->sh_info;
120 Elf32_Rela *rel = (void *)relsec->sh_addr;
121 unsigned int i;
122
123 for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rela); i++, rel++) {
124 Elf32_Addr *loc;
125 Elf32_Sym *sym;
126 Elf32_Addr v;
127 s32 offset;
128
129 offset = ELF32_R_SYM(rel->r_info);
130 if (offset < 0
131 || offset > (symsec->sh_size / sizeof(Elf32_Sym))) {
132 pr_err("%s: bad relocation\n", module->name);
133 pr_err("section %d reloc %d\n", relindex, i);
134 return -ENOEXEC;
135 }
136
137 sym = ((Elf32_Sym *) symsec->sh_addr) + offset;
138
139 if (rel->r_offset < 0
140 || rel->r_offset > dstsec->sh_size - sizeof(u16)) {
141 pr_err("%s: out of bounds relocation\n", module->name);
142 pr_err("section %d reloc %d offset 0x%0x size %d\n",
143 relindex, i, rel->r_offset, dstsec->sh_size);
144 return -ENOEXEC;
145 }
146
147 loc = (Elf32_Addr *) (dstsec->sh_addr + rel->r_offset);
148 v = sym->st_value + rel->r_addend;
149
150 switch (ELF32_R_TYPE(rel->r_info)) {
151 case R_NDS32_NONE:
152 case R_NDS32_INSN16:
153 case R_NDS32_LABEL:
154 case R_NDS32_LONGCALL1:
155 case R_NDS32_LONGCALL2:
156 case R_NDS32_LONGCALL3:
157 case R_NDS32_LONGCALL4:
158 case R_NDS32_LONGJUMP1:
159 case R_NDS32_LONGJUMP2:
160 case R_NDS32_LONGJUMP3:
161 case R_NDS32_9_FIXED_RELA:
162 case R_NDS32_15_FIXED_RELA:
163 case R_NDS32_17_FIXED_RELA:
164 case R_NDS32_25_FIXED_RELA:
165 case R_NDS32_LOADSTORE:
166 case R_NDS32_DWARF2_OP1_RELA:
167 case R_NDS32_DWARF2_OP2_RELA:
168 case R_NDS32_DWARF2_LEB_RELA:
169 case R_NDS32_RELA_NOP_MIX ... R_NDS32_RELA_NOP_MAX:
170 break;
171
172 case R_NDS32_32_RELA:
173 do_reloc32(v, loc, 0xffffffff, 0, 0, 0, 0);
174 break;
175
176 case R_NDS32_HI20_RELA:
177 do_reloc32(v, loc, 0xfffff000, 12, 0xfff00000, 0,
178 NEED_SWAP);
179 break;
180
181 case R_NDS32_LO12S3_RELA:
182 do_reloc32(v, loc, 0x00000fff, 3, 0xfffff000, 0,
183 NEED_SWAP);
184 break;
185
186 case R_NDS32_LO12S2_RELA:
187 do_reloc32(v, loc, 0x00000fff, 2, 0xfffff000, 0,
188 NEED_SWAP);
189 break;
190
191 case R_NDS32_LO12S1_RELA:
192 do_reloc32(v, loc, 0x00000fff, 1, 0xfffff000, 0,
193 NEED_SWAP);
194 break;
195
196 case R_NDS32_LO12S0_RELA:
197 case R_NDS32_LO12S0_ORI_RELA:
198 do_reloc32(v, loc, 0x00000fff, 0, 0xfffff000, 0,
199 NEED_SWAP);
200 break;
201
202 case R_NDS32_9_PCREL_RELA:
203 if (exceed_limit
204 ((v - (Elf32_Addr) loc), 0x000000ff, module, rel,
205 relindex, i))
206 return -ENOEXEC;
207 do_reloc16(v - (Elf32_Addr) loc, loc, 0x000001ff, 1,
208 0xffffff00, 0, NEED_SWAP);
209 break;
210
211 case R_NDS32_15_PCREL_RELA:
212 if (exceed_limit
213 ((v - (Elf32_Addr) loc), 0x00003fff, module, rel,
214 relindex, i))
215 return -ENOEXEC;
216 do_reloc32(v - (Elf32_Addr) loc, loc, 0x00007fff, 1,
217 0xffffc000, 0, NEED_SWAP);
218 break;
219
220 case R_NDS32_17_PCREL_RELA:
221 if (exceed_limit
222 ((v - (Elf32_Addr) loc), 0x0000ffff, module, rel,
223 relindex, i))
224 return -ENOEXEC;
225 do_reloc32(v - (Elf32_Addr) loc, loc, 0x0001ffff, 1,
226 0xffff0000, 0, NEED_SWAP);
227 break;
228
229 case R_NDS32_25_PCREL_RELA:
230 if (exceed_limit
231 ((v - (Elf32_Addr) loc), 0x00ffffff, module, rel,
232 relindex, i))
233 return -ENOEXEC;
234 do_reloc32(v - (Elf32_Addr) loc, loc, 0x01ffffff, 1,
235 0xff000000, 0, NEED_SWAP);
236 break;
237 case R_NDS32_WORD_9_PCREL_RELA:
238 if (exceed_limit
239 ((v - (Elf32_Addr) loc), 0x000000ff, module, rel,
240 relindex, i))
241 return -ENOEXEC;
242 do_reloc32(v - (Elf32_Addr) loc, loc, 0x000001ff, 1,
243 0xffffff00, 0, NEED_SWAP);
244 break;
245
246 case R_NDS32_SDA15S3_RELA:
247 case R_NDS32_SDA15S2_RELA:
248 case R_NDS32_SDA15S1_RELA:
249 case R_NDS32_SDA15S0_RELA:
250 pr_err("%s: unsupported relocation type %d.\n",
251 module->name, ELF32_R_TYPE(rel->r_info));
252 pr_err
253 ("Small data section access doesn't work in the kernel space; "
254 "please rebuild the kernel module with gcc option -mcmodel=large.\n");
255 pr_err("section %d reloc %d offset 0x%x size %d\n",
256 relindex, i, rel->r_offset, dstsec->sh_size);
257 break;
258
259 default:
260 pr_err("%s: unsupported relocation type %d.\n",
261 module->name, ELF32_R_TYPE(rel->r_info));
262 pr_err("section %d reloc %d offset 0x%x size %d\n",
263 relindex, i, rel->r_offset, dstsec->sh_size);
264 }
265 }
266 return 0;
267 }
268
269 int
270 module_finalize(const Elf32_Ehdr * hdr, const Elf_Shdr * sechdrs,
271 struct module *module)
272 {
273 return 0;
274 }
275
276 void module_arch_cleanup(struct module *mod)
277 {
278 }