8d348c474a2f3b7ffde344246c0e41856f3988fe
[linux-2.6.git] / arch / sparc / kernel / module.c
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/gfp.h>
13 #include <linux/string.h>
14 #include <linux/ctype.h>
15 #include <linux/mm.h>
16
17 #include <asm/processor.h>
18 #include <asm/spitfire.h>
19
20 #ifdef CONFIG_SPARC64
21
22 #include <linux/jump_label.h>
23
24 static void *module_map(unsigned long size)
25 {
26         if (PAGE_ALIGN(size) > MODULES_LEN)
27                 return NULL;
28         return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END,
29                                 GFP_KERNEL, PAGE_KERNEL, -1,
30                                 __builtin_return_address(0));
31 }
32
33 static char *dot2underscore(char *name)
34 {
35         return name;
36 }
37 #else
38 static void *module_map(unsigned long size)
39 {
40         return vmalloc(size);
41 }
42
43 /* Replace references to .func with _Func */
44 static char *dot2underscore(char *name)
45 {
46         if (name[0] == '.') {
47                 name[0] = '_';
48                 name[1] = toupper(name[1]);
49         }
50         return name;
51 }
52 #endif /* CONFIG_SPARC64 */
53
54 void *module_alloc(unsigned long size)
55 {
56         void *ret;
57
58         /* We handle the zero case fine, unlike vmalloc */
59         if (size == 0)
60                 return NULL;
61
62         ret = module_map(size);
63         if (!ret)
64                 ret = ERR_PTR(-ENOMEM);
65         else
66                 memset(ret, 0, size);
67
68         return ret;
69 }
70
71 /* Free memory returned from module_core_alloc/module_init_alloc */
72 void module_free(struct module *mod, void *module_region)
73 {
74         vfree(module_region);
75 }
76
77 /* Make generic code ignore STT_REGISTER dummy undefined symbols.  */
78 int module_frob_arch_sections(Elf_Ehdr *hdr,
79                               Elf_Shdr *sechdrs,
80                               char *secstrings,
81                               struct module *mod)
82 {
83         unsigned int symidx;
84         Elf_Sym *sym;
85         char *strtab;
86         int i;
87
88         for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) {
89                 if (symidx == hdr->e_shnum-1) {
90                         printk("%s: no symtab found.\n", mod->name);
91                         return -ENOEXEC;
92                 }
93         }
94         sym = (Elf_Sym *)sechdrs[symidx].sh_addr;
95         strtab = (char *)sechdrs[sechdrs[symidx].sh_link].sh_addr;
96
97         for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) {
98                 if (sym[i].st_shndx == SHN_UNDEF) {
99                         if (ELF_ST_TYPE(sym[i].st_info) == STT_REGISTER) {
100                                 sym[i].st_shndx = SHN_ABS;
101                         } else {
102                                 char *name = strtab + sym[i].st_name;
103                                 dot2underscore(name);
104                         }
105                 }
106         }
107         return 0;
108 }
109
110 int apply_relocate(Elf_Shdr *sechdrs,
111                    const char *strtab,
112                    unsigned int symindex,
113                    unsigned int relsec,
114                    struct module *me)
115 {
116         printk(KERN_ERR "module %s: non-ADD RELOCATION unsupported\n",
117                me->name);
118         return -ENOEXEC;
119 }
120
121 int apply_relocate_add(Elf_Shdr *sechdrs,
122                        const char *strtab,
123                        unsigned int symindex,
124                        unsigned int relsec,
125                        struct module *me)
126 {
127         unsigned int i;
128         Elf_Rela *rel = (void *)sechdrs[relsec].sh_addr;
129         Elf_Sym *sym;
130         u8 *location;
131         u32 *loc32;
132
133         for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
134                 Elf_Addr v;
135
136                 /* This is where to make the change */
137                 location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr
138                         + rel[i].r_offset;
139                 loc32 = (u32 *) location;
140
141 #ifdef CONFIG_SPARC64
142                 BUG_ON(((u64)location >> (u64)32) != (u64)0);
143 #endif /* CONFIG_SPARC64 */
144
145                 /* This is the symbol it is referring to.  Note that all
146                    undefined symbols have been resolved.  */
147                 sym = (Elf_Sym *)sechdrs[symindex].sh_addr
148                         + ELF_R_SYM(rel[i].r_info);
149                 v = sym->st_value + rel[i].r_addend;
150
151                 switch (ELF_R_TYPE(rel[i].r_info) & 0xff) {
152 #ifdef CONFIG_SPARC64
153                 case R_SPARC_64:
154                         location[0] = v >> 56;
155                         location[1] = v >> 48;
156                         location[2] = v >> 40;
157                         location[3] = v >> 32;
158                         location[4] = v >> 24;
159                         location[5] = v >> 16;
160                         location[6] = v >>  8;
161                         location[7] = v >>  0;
162                         break;
163
164                 case R_SPARC_DISP32:
165                         v -= (Elf_Addr) location;
166                         *loc32 = v;
167                         break;
168
169                 case R_SPARC_WDISP19:
170                         v -= (Elf_Addr) location;
171                         *loc32 = (*loc32 & ~0x7ffff) |
172                                 ((v >> 2) & 0x7ffff);
173                         break;
174
175                 case R_SPARC_OLO10:
176                         *loc32 = (*loc32 & ~0x1fff) |
177                                 (((v & 0x3ff) +
178                                   (ELF_R_TYPE(rel[i].r_info) >> 8))
179                                  & 0x1fff);
180                         break;
181 #endif /* CONFIG_SPARC64 */
182
183                 case R_SPARC_32:
184                 case R_SPARC_UA32:
185                         location[0] = v >> 24;
186                         location[1] = v >> 16;
187                         location[2] = v >>  8;
188                         location[3] = v >>  0;
189                         break;
190
191                 case R_SPARC_WDISP30:
192                         v -= (Elf_Addr) location;
193                         *loc32 = (*loc32 & ~0x3fffffff) |
194                                 ((v >> 2) & 0x3fffffff);
195                         break;
196
197                 case R_SPARC_WDISP22:
198                         v -= (Elf_Addr) location;
199                         *loc32 = (*loc32 & ~0x3fffff) |
200                                 ((v >> 2) & 0x3fffff);
201                         break;
202
203                 case R_SPARC_LO10:
204                         *loc32 = (*loc32 & ~0x3ff) | (v & 0x3ff);
205                         break;
206
207                 case R_SPARC_HI22:
208                         *loc32 = (*loc32 & ~0x3fffff) |
209                                 ((v >> 10) & 0x3fffff);
210                         break;
211
212                 default:
213                         printk(KERN_ERR "module %s: Unknown relocation: %x\n",
214                                me->name,
215                                (int) (ELF_R_TYPE(rel[i].r_info) & 0xff));
216                         return -ENOEXEC;
217                 };
218         }
219         return 0;
220 }
221
222 #ifdef CONFIG_SPARC64
223 int module_finalize(const Elf_Ehdr *hdr,
224                     const Elf_Shdr *sechdrs,
225                     struct module *me)
226 {
227         /* make jump label nops */
228         jump_label_apply_nops(me);
229
230         /* Cheetah's I-cache is fully coherent.  */
231         if (tlb_type == spitfire) {
232                 unsigned long va;
233
234                 flushw_all();
235                 for (va =  0; va < (PAGE_SIZE << 1); va += 32)
236                         spitfire_put_icache_tag(va, 0x0);
237                 __asm__ __volatile__("flush %g6");
238         }
239
240         return 0;
241 }
242 #else
243 int module_finalize(const Elf_Ehdr *hdr,
244                     const Elf_Shdr *sechdrs,
245                     struct module *me)
246 {
247         return 0;
248 }
249 #endif /* CONFIG_SPARC64 */
250
251 void module_arch_cleanup(struct module *mod)
252 {
253 }