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c9a4a8da GH |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // Copyright (C) 2005-2017 Andes Technology Corporation | |
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) { | |
1dfdf991 | 43 | tmp &= (~loc_mask); |
c9a4a8da GH |
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) { | |
1dfdf991 | 73 | tmp &= (~loc_mask); |
c9a4a8da GH |
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 | } |