blob: f848aadf54dc1c2c1feb537752fdf3410efbe9d8 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* 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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090012#include <linux/gfp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/string.h>
Sam Ravnborge6b04fe2008-12-26 15:38:17 -080014#include <linux/ctype.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/mm.h>
16
17#include <asm/processor.h>
18#include <asm/spitfire.h>
19
Sam Ravnborg627bf2f2008-12-26 15:37:24 -080020#ifdef CONFIG_SPARC64
Linus Torvalds1da177e2005-04-16 15:20:36 -070021static void *module_map(unsigned long size)
22{
23 struct vm_struct *area;
24
25 size = PAGE_ALIGN(size);
26 if (!size || size > MODULES_LEN)
27 return NULL;
28
29 area = __get_vm_area(size, VM_ALLOC, MODULES_VADDR, MODULES_END);
30 if (!area)
31 return NULL;
32
33 return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL);
34}
35
Sam Ravnborg627bf2f2008-12-26 15:37:24 -080036static char *dot2underscore(char *name)
37{
38 return name;
39}
Sam Ravnborge6b04fe2008-12-26 15:38:17 -080040#else
41static void *module_map(unsigned long size)
42{
43 return vmalloc(size);
44}
45
46/* Replace references to .func with _Func */
47static char *dot2underscore(char *name)
48{
49 if (name[0] == '.') {
50 name[0] = '_';
51 name[1] = toupper(name[1]);
52 }
53 return name;
54}
Sam Ravnborg627bf2f2008-12-26 15:37:24 -080055#endif /* CONFIG_SPARC64 */
56
Linus Torvalds1da177e2005-04-16 15:20:36 -070057void *module_alloc(unsigned long size)
58{
59 void *ret;
60
61 /* We handle the zero case fine, unlike vmalloc */
62 if (size == 0)
63 return NULL;
64
65 ret = module_map(size);
66 if (!ret)
67 ret = ERR_PTR(-ENOMEM);
68 else
69 memset(ret, 0, size);
70
71 return ret;
72}
73
74/* Free memory returned from module_core_alloc/module_init_alloc */
75void module_free(struct module *mod, void *module_region)
76{
77 vfree(module_region);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078}
79
80/* Make generic code ignore STT_REGISTER dummy undefined symbols. */
81int module_frob_arch_sections(Elf_Ehdr *hdr,
82 Elf_Shdr *sechdrs,
83 char *secstrings,
84 struct module *mod)
85{
86 unsigned int symidx;
Sam Ravnborgc45d1c22008-12-26 15:36:29 -080087 Elf_Sym *sym;
Sam Ravnborg627bf2f2008-12-26 15:37:24 -080088 char *strtab;
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 int i;
90
91 for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) {
92 if (symidx == hdr->e_shnum-1) {
93 printk("%s: no symtab found.\n", mod->name);
94 return -ENOEXEC;
95 }
96 }
Sam Ravnborgc45d1c22008-12-26 15:36:29 -080097 sym = (Elf_Sym *)sechdrs[symidx].sh_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 strtab = (char *)sechdrs[sechdrs[symidx].sh_link].sh_addr;
99
100 for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) {
Sam Ravnborg627bf2f2008-12-26 15:37:24 -0800101 if (sym[i].st_shndx == SHN_UNDEF) {
102 if (ELF_ST_TYPE(sym[i].st_info) == STT_REGISTER) {
103 sym[i].st_shndx = SHN_ABS;
104 } else {
105 char *name = strtab + sym[i].st_name;
106 dot2underscore(name);
107 }
108 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 }
110 return 0;
111}
112
Sam Ravnborgc45d1c22008-12-26 15:36:29 -0800113int apply_relocate(Elf_Shdr *sechdrs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 const char *strtab,
115 unsigned int symindex,
116 unsigned int relsec,
117 struct module *me)
118{
119 printk(KERN_ERR "module %s: non-ADD RELOCATION unsupported\n",
120 me->name);
121 return -ENOEXEC;
122}
123
Sam Ravnborgc45d1c22008-12-26 15:36:29 -0800124int apply_relocate_add(Elf_Shdr *sechdrs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 const char *strtab,
126 unsigned int symindex,
127 unsigned int relsec,
128 struct module *me)
129{
130 unsigned int i;
Sam Ravnborgc45d1c22008-12-26 15:36:29 -0800131 Elf_Rela *rel = (void *)sechdrs[relsec].sh_addr;
132 Elf_Sym *sym;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 u8 *location;
134 u32 *loc32;
135
136 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
Sam Ravnborgc45d1c22008-12-26 15:36:29 -0800137 Elf_Addr v;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
139 /* This is where to make the change */
140 location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr
141 + rel[i].r_offset;
142 loc32 = (u32 *) location;
143
Sam Ravnborg627bf2f2008-12-26 15:37:24 -0800144#ifdef CONFIG_SPARC64
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 BUG_ON(((u64)location >> (u64)32) != (u64)0);
Sam Ravnborg627bf2f2008-12-26 15:37:24 -0800146#endif /* CONFIG_SPARC64 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
148 /* This is the symbol it is referring to. Note that all
149 undefined symbols have been resolved. */
Sam Ravnborgc45d1c22008-12-26 15:36:29 -0800150 sym = (Elf_Sym *)sechdrs[symindex].sh_addr
151 + ELF_R_SYM(rel[i].r_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 v = sym->st_value + rel[i].r_addend;
153
Sam Ravnborgc45d1c22008-12-26 15:36:29 -0800154 switch (ELF_R_TYPE(rel[i].r_info) & 0xff) {
Sam Ravnborg627bf2f2008-12-26 15:37:24 -0800155#ifdef CONFIG_SPARC64
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 case R_SPARC_64:
157 location[0] = v >> 56;
158 location[1] = v >> 48;
159 location[2] = v >> 40;
160 location[3] = v >> 32;
161 location[4] = v >> 24;
162 location[5] = v >> 16;
163 location[6] = v >> 8;
164 location[7] = v >> 0;
165 break;
166
Sam Ravnborg627bf2f2008-12-26 15:37:24 -0800167 case R_SPARC_DISP32:
168 v -= (Elf_Addr) location;
169 *loc32 = v;
170 break;
171
172 case R_SPARC_WDISP19:
173 v -= (Elf_Addr) location;
174 *loc32 = (*loc32 & ~0x7ffff) |
175 ((v >> 2) & 0x7ffff);
176 break;
177
178 case R_SPARC_OLO10:
179 *loc32 = (*loc32 & ~0x1fff) |
180 (((v & 0x3ff) +
181 (ELF_R_TYPE(rel[i].r_info) >> 8))
182 & 0x1fff);
183 break;
184#endif /* CONFIG_SPARC64 */
185
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 case R_SPARC_32:
Sam Ravnborge6b04fe2008-12-26 15:38:17 -0800187 case R_SPARC_UA32:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 location[0] = v >> 24;
189 location[1] = v >> 16;
190 location[2] = v >> 8;
191 location[3] = v >> 0;
192 break;
193
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 case R_SPARC_WDISP30:
Sam Ravnborgc45d1c22008-12-26 15:36:29 -0800195 v -= (Elf_Addr) location;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 *loc32 = (*loc32 & ~0x3fffffff) |
197 ((v >> 2) & 0x3fffffff);
198 break;
199
200 case R_SPARC_WDISP22:
Sam Ravnborgc45d1c22008-12-26 15:36:29 -0800201 v -= (Elf_Addr) location;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 *loc32 = (*loc32 & ~0x3fffff) |
203 ((v >> 2) & 0x3fffff);
204 break;
205
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 case R_SPARC_LO10:
207 *loc32 = (*loc32 & ~0x3ff) | (v & 0x3ff);
208 break;
209
210 case R_SPARC_HI22:
211 *loc32 = (*loc32 & ~0x3fffff) |
212 ((v >> 10) & 0x3fffff);
213 break;
214
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 default:
216 printk(KERN_ERR "module %s: Unknown relocation: %x\n",
217 me->name,
Sam Ravnborgc45d1c22008-12-26 15:36:29 -0800218 (int) (ELF_R_TYPE(rel[i].r_info) & 0xff));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 return -ENOEXEC;
220 };
221 }
222 return 0;
223}
224
Sam Ravnborg627bf2f2008-12-26 15:37:24 -0800225#ifdef CONFIG_SPARC64
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226int module_finalize(const Elf_Ehdr *hdr,
227 const Elf_Shdr *sechdrs,
228 struct module *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}
Sam Ravnborge6b04fe2008-12-26 15:38:17 -0800242#else
243int module_finalize(const Elf_Ehdr *hdr,
244 const Elf_Shdr *sechdrs,
245 struct module *me)
246{
247 return 0;
248}
Sam Ravnborg627bf2f2008-12-26 15:37:24 -0800249#endif /* CONFIG_SPARC64 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250
251void module_arch_cleanup(struct module *mod)
252{
253}