Commit | Line | Data |
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1da177e4 LT |
1 | /* Kernel module help for sparc64. |
2 | * | |
3 | * Copyright (C) 2001 Rusty Russell. | |
4 | * Copyright (C) 2002 David S. Miller. | |
5 | */ | |
6 | ||
7 | #include <linux/moduleloader.h> | |
8 | #include <linux/kernel.h> | |
9 | #include <linux/elf.h> | |
10 | #include <linux/vmalloc.h> | |
11 | #include <linux/fs.h> | |
12 | #include <linux/string.h> | |
13 | #include <linux/slab.h> | |
14 | #include <linux/vmalloc.h> | |
15 | #include <linux/mm.h> | |
16 | ||
17 | #include <asm/processor.h> | |
18 | #include <asm/spitfire.h> | |
19 | ||
20 | static void *module_map(unsigned long size) | |
21 | { | |
22 | struct vm_struct *area; | |
23 | ||
24 | size = PAGE_ALIGN(size); | |
25 | if (!size || size > MODULES_LEN) | |
26 | return NULL; | |
27 | ||
28 | area = __get_vm_area(size, VM_ALLOC, MODULES_VADDR, MODULES_END); | |
29 | if (!area) | |
30 | return NULL; | |
31 | ||
32 | return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL); | |
33 | } | |
34 | ||
35 | void *module_alloc(unsigned long size) | |
36 | { | |
37 | void *ret; | |
38 | ||
39 | /* We handle the zero case fine, unlike vmalloc */ | |
40 | if (size == 0) | |
41 | return NULL; | |
42 | ||
43 | ret = module_map(size); | |
44 | if (!ret) | |
45 | ret = ERR_PTR(-ENOMEM); | |
46 | else | |
47 | memset(ret, 0, size); | |
48 | ||
49 | return ret; | |
50 | } | |
51 | ||
52 | /* Free memory returned from module_core_alloc/module_init_alloc */ | |
53 | void module_free(struct module *mod, void *module_region) | |
54 | { | |
55 | vfree(module_region); | |
56 | /* FIXME: If module_region == mod->init_region, trim exception | |
57 | table entries. */ | |
58 | } | |
59 | ||
60 | /* Make generic code ignore STT_REGISTER dummy undefined symbols. */ | |
61 | int module_frob_arch_sections(Elf_Ehdr *hdr, | |
62 | Elf_Shdr *sechdrs, | |
63 | char *secstrings, | |
64 | struct module *mod) | |
65 | { | |
66 | unsigned int symidx; | |
67 | Elf64_Sym *sym; | |
68 | const char *strtab; | |
69 | int i; | |
70 | ||
71 | for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) { | |
72 | if (symidx == hdr->e_shnum-1) { | |
73 | printk("%s: no symtab found.\n", mod->name); | |
74 | return -ENOEXEC; | |
75 | } | |
76 | } | |
77 | sym = (Elf64_Sym *)sechdrs[symidx].sh_addr; | |
78 | strtab = (char *)sechdrs[sechdrs[symidx].sh_link].sh_addr; | |
79 | ||
80 | for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) { | |
81 | if (sym[i].st_shndx == SHN_UNDEF && | |
82 | ELF64_ST_TYPE(sym[i].st_info) == STT_REGISTER) | |
83 | sym[i].st_shndx = SHN_ABS; | |
84 | } | |
85 | return 0; | |
86 | } | |
87 | ||
88 | int apply_relocate(Elf64_Shdr *sechdrs, | |
89 | const char *strtab, | |
90 | unsigned int symindex, | |
91 | unsigned int relsec, | |
92 | struct module *me) | |
93 | { | |
94 | printk(KERN_ERR "module %s: non-ADD RELOCATION unsupported\n", | |
95 | me->name); | |
96 | return -ENOEXEC; | |
97 | } | |
98 | ||
99 | int apply_relocate_add(Elf64_Shdr *sechdrs, | |
100 | const char *strtab, | |
101 | unsigned int symindex, | |
102 | unsigned int relsec, | |
103 | struct module *me) | |
104 | { | |
105 | unsigned int i; | |
106 | Elf64_Rela *rel = (void *)sechdrs[relsec].sh_addr; | |
107 | Elf64_Sym *sym; | |
108 | u8 *location; | |
109 | u32 *loc32; | |
110 | ||
111 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { | |
112 | Elf64_Addr v; | |
113 | ||
114 | /* This is where to make the change */ | |
115 | location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr | |
116 | + rel[i].r_offset; | |
117 | loc32 = (u32 *) location; | |
118 | ||
119 | BUG_ON(((u64)location >> (u64)32) != (u64)0); | |
120 | ||
121 | /* This is the symbol it is referring to. Note that all | |
122 | undefined symbols have been resolved. */ | |
123 | sym = (Elf64_Sym *)sechdrs[symindex].sh_addr | |
124 | + ELF64_R_SYM(rel[i].r_info); | |
125 | v = sym->st_value + rel[i].r_addend; | |
126 | ||
127 | switch (ELF64_R_TYPE(rel[i].r_info) & 0xff) { | |
128 | case R_SPARC_64: | |
129 | location[0] = v >> 56; | |
130 | location[1] = v >> 48; | |
131 | location[2] = v >> 40; | |
132 | location[3] = v >> 32; | |
133 | location[4] = v >> 24; | |
134 | location[5] = v >> 16; | |
135 | location[6] = v >> 8; | |
136 | location[7] = v >> 0; | |
137 | break; | |
138 | ||
139 | case R_SPARC_32: | |
140 | location[0] = v >> 24; | |
141 | location[1] = v >> 16; | |
142 | location[2] = v >> 8; | |
143 | location[3] = v >> 0; | |
144 | break; | |
145 | ||
06a1be16 DM |
146 | case R_SPARC_DISP32: |
147 | v -= (Elf64_Addr) location; | |
148 | *loc32 = v; | |
149 | break; | |
150 | ||
1da177e4 LT |
151 | case R_SPARC_WDISP30: |
152 | v -= (Elf64_Addr) location; | |
153 | *loc32 = (*loc32 & ~0x3fffffff) | | |
154 | ((v >> 2) & 0x3fffffff); | |
155 | break; | |
156 | ||
157 | case R_SPARC_WDISP22: | |
158 | v -= (Elf64_Addr) location; | |
159 | *loc32 = (*loc32 & ~0x3fffff) | | |
160 | ((v >> 2) & 0x3fffff); | |
161 | break; | |
162 | ||
163 | case R_SPARC_WDISP19: | |
164 | v -= (Elf64_Addr) location; | |
165 | *loc32 = (*loc32 & ~0x7ffff) | | |
166 | ((v >> 2) & 0x7ffff); | |
167 | break; | |
168 | ||
169 | case R_SPARC_LO10: | |
170 | *loc32 = (*loc32 & ~0x3ff) | (v & 0x3ff); | |
171 | break; | |
172 | ||
173 | case R_SPARC_HI22: | |
174 | *loc32 = (*loc32 & ~0x3fffff) | | |
175 | ((v >> 10) & 0x3fffff); | |
176 | break; | |
177 | ||
178 | case R_SPARC_OLO10: | |
179 | *loc32 = (*loc32 & ~0x1fff) | | |
180 | (((v & 0x3ff) + | |
181 | (ELF64_R_TYPE(rel[i].r_info) >> 8)) | |
182 | & 0x1fff); | |
183 | break; | |
184 | ||
185 | default: | |
186 | printk(KERN_ERR "module %s: Unknown relocation: %x\n", | |
187 | me->name, | |
188 | (int) (ELF64_R_TYPE(rel[i].r_info) & 0xff)); | |
189 | return -ENOEXEC; | |
190 | }; | |
191 | } | |
192 | return 0; | |
193 | } | |
194 | ||
195 | int module_finalize(const Elf_Ehdr *hdr, | |
196 | const Elf_Shdr *sechdrs, | |
197 | struct module *me) | |
198 | { | |
199 | /* Cheetah's I-cache is fully coherent. */ | |
200 | if (tlb_type == spitfire) { | |
201 | unsigned long va; | |
202 | ||
203 | flushw_all(); | |
204 | for (va = 0; va < (PAGE_SIZE << 1); va += 32) | |
205 | spitfire_put_icache_tag(va, 0x0); | |
206 | __asm__ __volatile__("flush %g6"); | |
207 | } | |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
212 | void module_arch_cleanup(struct module *mod) | |
213 | { | |
214 | } |