Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc
[linux-2.6] / arch / sparc64 / 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/string.h>
13 #include <linux/slab.h>
14 #include <linux/mm.h>
15
16 #include <asm/processor.h>
17 #include <asm/spitfire.h>
18
19 static void *module_map(unsigned long size)
20 {
21         struct vm_struct *area;
22
23         size = PAGE_ALIGN(size);
24         if (!size || size > MODULES_LEN)
25                 return NULL;
26
27         area = __get_vm_area(size, VM_ALLOC, MODULES_VADDR, MODULES_END);
28         if (!area)
29                 return NULL;
30
31         return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL);
32 }
33
34 void *module_alloc(unsigned long size)
35 {
36         void *ret;
37
38         /* We handle the zero case fine, unlike vmalloc */
39         if (size == 0)
40                 return NULL;
41
42         ret = module_map(size);
43         if (!ret)
44                 ret = ERR_PTR(-ENOMEM);
45         else
46                 memset(ret, 0, size);
47
48         return ret;
49 }
50
51 /* Free memory returned from module_core_alloc/module_init_alloc */
52 void module_free(struct module *mod, void *module_region)
53 {
54         vfree(module_region);
55         /* FIXME: If module_region == mod->init_region, trim exception
56            table entries. */
57 }
58
59 /* Make generic code ignore STT_REGISTER dummy undefined symbols.  */
60 int module_frob_arch_sections(Elf_Ehdr *hdr,
61                               Elf_Shdr *sechdrs,
62                               char *secstrings,
63                               struct module *mod)
64 {
65         unsigned int symidx;
66         Elf64_Sym *sym;
67         const char *strtab;
68         int i;
69
70         for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) {
71                 if (symidx == hdr->e_shnum-1) {
72                         printk("%s: no symtab found.\n", mod->name);
73                         return -ENOEXEC;
74                 }
75         }
76         sym = (Elf64_Sym *)sechdrs[symidx].sh_addr;
77         strtab = (char *)sechdrs[sechdrs[symidx].sh_link].sh_addr;
78
79         for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) {
80                 if (sym[i].st_shndx == SHN_UNDEF &&
81                     ELF64_ST_TYPE(sym[i].st_info) == STT_REGISTER)
82                         sym[i].st_shndx = SHN_ABS;
83         }
84         return 0;
85 }
86
87 int apply_relocate(Elf64_Shdr *sechdrs,
88                    const char *strtab,
89                    unsigned int symindex,
90                    unsigned int relsec,
91                    struct module *me)
92 {
93         printk(KERN_ERR "module %s: non-ADD RELOCATION unsupported\n",
94                me->name);
95         return -ENOEXEC;
96 }
97
98 int apply_relocate_add(Elf64_Shdr *sechdrs,
99                        const char *strtab,
100                        unsigned int symindex,
101                        unsigned int relsec,
102                        struct module *me)
103 {
104         unsigned int i;
105         Elf64_Rela *rel = (void *)sechdrs[relsec].sh_addr;
106         Elf64_Sym *sym;
107         u8 *location;
108         u32 *loc32;
109
110         for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
111                 Elf64_Addr v;
112
113                 /* This is where to make the change */
114                 location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr
115                         + rel[i].r_offset;
116                 loc32 = (u32 *) location;
117
118                 BUG_ON(((u64)location >> (u64)32) != (u64)0);
119
120                 /* This is the symbol it is referring to.  Note that all
121                    undefined symbols have been resolved.  */
122                 sym = (Elf64_Sym *)sechdrs[symindex].sh_addr
123                         + ELF64_R_SYM(rel[i].r_info);
124                 v = sym->st_value + rel[i].r_addend;
125
126                 switch (ELF64_R_TYPE(rel[i].r_info) & 0xff) {
127                 case R_SPARC_64:
128                         location[0] = v >> 56;
129                         location[1] = v >> 48;
130                         location[2] = v >> 40;
131                         location[3] = v >> 32;
132                         location[4] = v >> 24;
133                         location[5] = v >> 16;
134                         location[6] = v >>  8;
135                         location[7] = v >>  0;
136                         break;
137
138                 case R_SPARC_32:
139                         location[0] = v >> 24;
140                         location[1] = v >> 16;
141                         location[2] = v >>  8;
142                         location[3] = v >>  0;
143                         break;
144
145                 case R_SPARC_DISP32:
146                         v -= (Elf64_Addr) location;
147                         *loc32 = v;
148                         break;
149
150                 case R_SPARC_WDISP30:
151                         v -= (Elf64_Addr) location;
152                         *loc32 = (*loc32 & ~0x3fffffff) |
153                                 ((v >> 2) & 0x3fffffff);
154                         break;
155
156                 case R_SPARC_WDISP22:
157                         v -= (Elf64_Addr) location;
158                         *loc32 = (*loc32 & ~0x3fffff) |
159                                 ((v >> 2) & 0x3fffff);
160                         break;
161
162                 case R_SPARC_WDISP19:
163                         v -= (Elf64_Addr) location;
164                         *loc32 = (*loc32 & ~0x7ffff) |
165                                 ((v >> 2) & 0x7ffff);
166                         break;
167
168                 case R_SPARC_LO10:
169                         *loc32 = (*loc32 & ~0x3ff) | (v & 0x3ff);
170                         break;
171
172                 case R_SPARC_HI22:
173                         *loc32 = (*loc32 & ~0x3fffff) |
174                                 ((v >> 10) & 0x3fffff);
175                         break;
176
177                 case R_SPARC_OLO10:
178                         *loc32 = (*loc32 & ~0x1fff) |
179                                 (((v & 0x3ff) +
180                                   (ELF64_R_TYPE(rel[i].r_info) >> 8))
181                                  & 0x1fff);
182                         break;
183
184                 default:
185                         printk(KERN_ERR "module %s: Unknown relocation: %x\n",
186                                me->name,
187                                (int) (ELF64_R_TYPE(rel[i].r_info) & 0xff));
188                         return -ENOEXEC;
189                 };
190         }
191         return 0;
192 }
193
194 int module_finalize(const Elf_Ehdr *hdr,
195                     const Elf_Shdr *sechdrs,
196                     struct module *me)
197 {
198         /* Cheetah's I-cache is fully coherent.  */
199         if (tlb_type == spitfire) {
200                 unsigned long va;
201
202                 flushw_all();
203                 for (va =  0; va < (PAGE_SIZE << 1); va += 32)
204                         spitfire_put_icache_tag(va, 0x0);
205                 __asm__ __volatile__("flush %g6");
206         }
207
208         return 0;
209 }
210
211 void module_arch_cleanup(struct module *mod)
212 {
213 }