Commit | Line | Data |
---|---|---|
867e359b CM |
1 | /* |
2 | * Copyright 2010 Tilera Corporation. All Rights Reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation, version 2. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or | |
11 | * NON INFRINGEMENT. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * Based on i386 version, copyright (C) 2001 Rusty Russell. | |
15 | */ | |
16 | ||
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 <asm/opcode-tile.h> | |
24 | #include <asm/pgtable.h> | |
25 | ||
26 | #ifdef __tilegx__ | |
27 | # define Elf_Rela Elf64_Rela | |
28 | # define ELF_R_SYM ELF64_R_SYM | |
29 | # define ELF_R_TYPE ELF64_R_TYPE | |
30 | #else | |
31 | # define Elf_Rela Elf32_Rela | |
32 | # define ELF_R_SYM ELF32_R_SYM | |
33 | # define ELF_R_TYPE ELF32_R_TYPE | |
34 | #endif | |
35 | ||
36 | #ifdef MODULE_DEBUG | |
37 | #define DEBUGP printk | |
38 | #else | |
39 | #define DEBUGP(fmt...) | |
40 | #endif | |
41 | ||
42 | /* | |
43 | * Allocate some address space in the range MEM_MODULE_START to | |
44 | * MEM_MODULE_END and populate it with memory. | |
45 | */ | |
46 | void *module_alloc(unsigned long size) | |
47 | { | |
48 | struct page **pages; | |
49 | pgprot_t prot_rwx = __pgprot(_PAGE_KERNEL | _PAGE_KERNEL_EXEC); | |
50 | struct vm_struct *area; | |
51 | int i = 0; | |
52 | int npages; | |
53 | ||
54 | if (size == 0) | |
55 | return NULL; | |
56 | npages = (size + PAGE_SIZE - 1) / PAGE_SIZE; | |
57 | pages = kmalloc(npages * sizeof(struct page *), GFP_KERNEL); | |
58 | if (pages == NULL) | |
59 | return NULL; | |
60 | for (; i < npages; ++i) { | |
61 | pages[i] = alloc_page(GFP_KERNEL | __GFP_HIGHMEM); | |
62 | if (!pages[i]) | |
63 | goto error; | |
64 | } | |
65 | ||
66 | area = __get_vm_area(size, VM_ALLOC, MEM_MODULE_START, MEM_MODULE_END); | |
67 | if (!area) | |
68 | goto error; | |
69 | ||
70 | if (map_vm_area(area, prot_rwx, &pages)) { | |
71 | vunmap(area->addr); | |
72 | goto error; | |
73 | } | |
74 | ||
75 | return area->addr; | |
76 | ||
77 | error: | |
78 | while (--i >= 0) | |
79 | __free_page(pages[i]); | |
80 | kfree(pages); | |
81 | return NULL; | |
82 | } | |
83 | ||
84 | ||
85 | /* Free memory returned from module_alloc */ | |
86 | void module_free(struct module *mod, void *module_region) | |
87 | { | |
88 | vfree(module_region); | |
89 | /* | |
90 | * FIXME: If module_region == mod->init_region, trim exception | |
91 | * table entries. | |
92 | */ | |
93 | } | |
94 | ||
95 | /* We don't need anything special. */ | |
96 | int module_frob_arch_sections(Elf_Ehdr *hdr, | |
97 | Elf_Shdr *sechdrs, | |
98 | char *secstrings, | |
99 | struct module *mod) | |
100 | { | |
101 | return 0; | |
102 | } | |
103 | ||
104 | int apply_relocate(Elf_Shdr *sechdrs, | |
105 | const char *strtab, | |
106 | unsigned int symindex, | |
107 | unsigned int relsec, | |
108 | struct module *me) | |
109 | { | |
0707ad30 | 110 | pr_err("module %s: .rel relocation unsupported\n", me->name); |
867e359b CM |
111 | return -ENOEXEC; |
112 | } | |
113 | ||
114 | #ifdef __tilegx__ | |
115 | /* | |
116 | * Validate that the high 16 bits of "value" is just the sign-extension of | |
117 | * the low 48 bits. | |
118 | */ | |
119 | static int validate_hw2_last(long value, struct module *me) | |
120 | { | |
121 | if (((value << 16) >> 16) != value) { | |
0707ad30 CM |
122 | pr_warning("module %s: Out of range HW2_LAST value %#lx\n", |
123 | me->name, value); | |
867e359b CM |
124 | return 0; |
125 | } | |
126 | return 1; | |
127 | } | |
128 | ||
129 | /* | |
130 | * Validate that "value" isn't too big to hold in a JumpOff relocation. | |
131 | */ | |
132 | static int validate_jumpoff(long value) | |
133 | { | |
134 | /* Determine size of jump offset. */ | |
135 | int shift = __builtin_clzl(get_JumpOff_X1(create_JumpOff_X1(-1))); | |
136 | ||
137 | /* Check to see if it fits into the relocation slot. */ | |
138 | long f = get_JumpOff_X1(create_JumpOff_X1(value)); | |
139 | f = (f << shift) >> shift; | |
140 | ||
141 | return f == value; | |
142 | } | |
143 | #endif | |
144 | ||
145 | int apply_relocate_add(Elf_Shdr *sechdrs, | |
146 | const char *strtab, | |
147 | unsigned int symindex, | |
148 | unsigned int relsec, | |
149 | struct module *me) | |
150 | { | |
151 | unsigned int i; | |
152 | Elf_Rela *rel = (void *)sechdrs[relsec].sh_addr; | |
153 | Elf_Sym *sym; | |
154 | u64 *location; | |
155 | unsigned long value; | |
156 | ||
157 | DEBUGP("Applying relocate section %u to %u\n", relsec, | |
158 | sechdrs[relsec].sh_info); | |
159 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { | |
160 | /* This is where to make the change */ | |
161 | location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr | |
162 | + rel[i].r_offset; | |
163 | /* | |
164 | * This is the symbol it is referring to. | |
165 | * Note that all undefined symbols have been resolved. | |
166 | */ | |
167 | sym = (Elf_Sym *)sechdrs[symindex].sh_addr | |
168 | + ELF_R_SYM(rel[i].r_info); | |
169 | value = sym->st_value + rel[i].r_addend; | |
170 | ||
171 | switch (ELF_R_TYPE(rel[i].r_info)) { | |
172 | ||
173 | #define MUNGE(func) (*location = ((*location & ~func(-1)) | func(value))) | |
174 | ||
175 | #ifndef __tilegx__ | |
176 | case R_TILE_32: | |
177 | *(uint32_t *)location = value; | |
178 | break; | |
179 | case R_TILE_IMM16_X0_HA: | |
180 | value = (value + 0x8000) >> 16; | |
181 | /*FALLTHROUGH*/ | |
182 | case R_TILE_IMM16_X0_LO: | |
183 | MUNGE(create_Imm16_X0); | |
184 | break; | |
185 | case R_TILE_IMM16_X1_HA: | |
186 | value = (value + 0x8000) >> 16; | |
187 | /*FALLTHROUGH*/ | |
188 | case R_TILE_IMM16_X1_LO: | |
189 | MUNGE(create_Imm16_X1); | |
190 | break; | |
191 | case R_TILE_JOFFLONG_X1: | |
192 | value -= (unsigned long) location; /* pc-relative */ | |
193 | value = (long) value >> 3; /* count by instrs */ | |
194 | MUNGE(create_JOffLong_X1); | |
195 | break; | |
196 | #else | |
197 | case R_TILEGX_64: | |
198 | *location = value; | |
199 | break; | |
200 | case R_TILEGX_IMM16_X0_HW2_LAST: | |
201 | if (!validate_hw2_last(value, me)) | |
202 | return -ENOEXEC; | |
203 | value >>= 16; | |
204 | /*FALLTHROUGH*/ | |
205 | case R_TILEGX_IMM16_X0_HW1: | |
206 | value >>= 16; | |
207 | /*FALLTHROUGH*/ | |
208 | case R_TILEGX_IMM16_X0_HW0: | |
209 | MUNGE(create_Imm16_X0); | |
210 | break; | |
211 | case R_TILEGX_IMM16_X1_HW2_LAST: | |
212 | if (!validate_hw2_last(value, me)) | |
213 | return -ENOEXEC; | |
214 | value >>= 16; | |
215 | /*FALLTHROUGH*/ | |
216 | case R_TILEGX_IMM16_X1_HW1: | |
217 | value >>= 16; | |
218 | /*FALLTHROUGH*/ | |
219 | case R_TILEGX_IMM16_X1_HW0: | |
220 | MUNGE(create_Imm16_X1); | |
221 | break; | |
222 | case R_TILEGX_JUMPOFF_X1: | |
223 | value -= (unsigned long) location; /* pc-relative */ | |
224 | value = (long) value >> 3; /* count by instrs */ | |
225 | if (!validate_jumpoff(value)) { | |
0707ad30 CM |
226 | pr_warning("module %s: Out of range jump to" |
227 | " %#llx at %#llx (%p)\n", me->name, | |
228 | sym->st_value + rel[i].r_addend, | |
229 | rel[i].r_offset, location); | |
867e359b CM |
230 | return -ENOEXEC; |
231 | } | |
232 | MUNGE(create_JumpOff_X1); | |
233 | break; | |
234 | #endif | |
235 | ||
236 | #undef MUNGE | |
237 | ||
238 | default: | |
0707ad30 | 239 | pr_err("module %s: Unknown relocation: %d\n", |
867e359b CM |
240 | me->name, (int) ELF_R_TYPE(rel[i].r_info)); |
241 | return -ENOEXEC; | |
242 | } | |
243 | } | |
244 | return 0; | |
245 | } | |
246 | ||
247 | int module_finalize(const Elf_Ehdr *hdr, | |
248 | const Elf_Shdr *sechdrs, | |
249 | struct module *me) | |
250 | { | |
251 | /* FIXME: perhaps remove the "writable" bit from the TLB? */ | |
252 | return 0; | |
253 | } | |
254 | ||
255 | void module_arch_cleanup(struct module *mod) | |
256 | { | |
257 | } |