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Viewing changes to arch/sparc/kernel/module.c

  • Committer: Package Import Robot
  • Author(s): Alessio Igor Bogani
  • Date: 2011-10-26 11:13:05 UTC
  • Revision ID: package-import@ubuntu.com-20111026111305-tz023xykf0i6eosh
Tags: upstream-3.2.0
Import upstream version 3.2.0

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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
#include "entry.h"
 
21
 
 
22
#ifdef CONFIG_SPARC64
 
23
 
 
24
#include <linux/jump_label.h>
 
25
 
 
26
static void *module_map(unsigned long size)
 
27
{
 
28
        if (PAGE_ALIGN(size) > MODULES_LEN)
 
29
                return NULL;
 
30
        return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END,
 
31
                                GFP_KERNEL, PAGE_KERNEL, -1,
 
32
                                __builtin_return_address(0));
 
33
}
 
34
 
 
35
static char *dot2underscore(char *name)
 
36
{
 
37
        return name;
 
38
}
 
39
#else
 
40
static void *module_map(unsigned long size)
 
41
{
 
42
        return vmalloc(size);
 
43
}
 
44
 
 
45
/* Replace references to .func with _Func */
 
46
static char *dot2underscore(char *name)
 
47
{
 
48
        if (name[0] == '.') {
 
49
                name[0] = '_';
 
50
                name[1] = toupper(name[1]);
 
51
        }
 
52
        return name;
 
53
}
 
54
#endif /* CONFIG_SPARC64 */
 
55
 
 
56
void *module_alloc(unsigned long size)
 
57
{
 
58
        void *ret;
 
59
 
 
60
        /* We handle the zero case fine, unlike vmalloc */
 
61
        if (size == 0)
 
62
                return NULL;
 
63
 
 
64
        ret = module_map(size);
 
65
        if (!ret)
 
66
                ret = ERR_PTR(-ENOMEM);
 
67
        else
 
68
                memset(ret, 0, size);
 
69
 
 
70
        return ret;
 
71
}
 
72
 
 
73
/* Make generic code ignore STT_REGISTER dummy undefined symbols.  */
 
74
int module_frob_arch_sections(Elf_Ehdr *hdr,
 
75
                              Elf_Shdr *sechdrs,
 
76
                              char *secstrings,
 
77
                              struct module *mod)
 
78
{
 
79
        unsigned int symidx;
 
80
        Elf_Sym *sym;
 
81
        char *strtab;
 
82
        int i;
 
83
 
 
84
        for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) {
 
85
                if (symidx == hdr->e_shnum-1) {
 
86
                        printk("%s: no symtab found.\n", mod->name);
 
87
                        return -ENOEXEC;
 
88
                }
 
89
        }
 
90
        sym = (Elf_Sym *)sechdrs[symidx].sh_addr;
 
91
        strtab = (char *)sechdrs[sechdrs[symidx].sh_link].sh_addr;
 
92
 
 
93
        for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) {
 
94
                if (sym[i].st_shndx == SHN_UNDEF) {
 
95
                        if (ELF_ST_TYPE(sym[i].st_info) == STT_REGISTER) {
 
96
                                sym[i].st_shndx = SHN_ABS;
 
97
                        } else {
 
98
                                char *name = strtab + sym[i].st_name;
 
99
                                dot2underscore(name);
 
100
                        }
 
101
                }
 
102
        }
 
103
        return 0;
 
104
}
 
105
 
 
106
int apply_relocate_add(Elf_Shdr *sechdrs,
 
107
                       const char *strtab,
 
108
                       unsigned int symindex,
 
109
                       unsigned int relsec,
 
110
                       struct module *me)
 
111
{
 
112
        unsigned int i;
 
113
        Elf_Rela *rel = (void *)sechdrs[relsec].sh_addr;
 
114
        Elf_Sym *sym;
 
115
        u8 *location;
 
116
        u32 *loc32;
 
117
 
 
118
        for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
 
119
                Elf_Addr v;
 
120
 
 
121
                /* This is where to make the change */
 
122
                location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr
 
123
                        + rel[i].r_offset;
 
124
                loc32 = (u32 *) location;
 
125
 
 
126
#ifdef CONFIG_SPARC64
 
127
                BUG_ON(((u64)location >> (u64)32) != (u64)0);
 
128
#endif /* CONFIG_SPARC64 */
 
129
 
 
130
                /* This is the symbol it is referring to.  Note that all
 
131
                   undefined symbols have been resolved.  */
 
132
                sym = (Elf_Sym *)sechdrs[symindex].sh_addr
 
133
                        + ELF_R_SYM(rel[i].r_info);
 
134
                v = sym->st_value + rel[i].r_addend;
 
135
 
 
136
                switch (ELF_R_TYPE(rel[i].r_info) & 0xff) {
 
137
#ifdef CONFIG_SPARC64
 
138
                case R_SPARC_64:
 
139
                        location[0] = v >> 56;
 
140
                        location[1] = v >> 48;
 
141
                        location[2] = v >> 40;
 
142
                        location[3] = v >> 32;
 
143
                        location[4] = v >> 24;
 
144
                        location[5] = v >> 16;
 
145
                        location[6] = v >>  8;
 
146
                        location[7] = v >>  0;
 
147
                        break;
 
148
 
 
149
                case R_SPARC_DISP32:
 
150
                        v -= (Elf_Addr) location;
 
151
                        *loc32 = v;
 
152
                        break;
 
153
 
 
154
                case R_SPARC_WDISP19:
 
155
                        v -= (Elf_Addr) location;
 
156
                        *loc32 = (*loc32 & ~0x7ffff) |
 
157
                                ((v >> 2) & 0x7ffff);
 
158
                        break;
 
159
 
 
160
                case R_SPARC_OLO10:
 
161
                        *loc32 = (*loc32 & ~0x1fff) |
 
162
                                (((v & 0x3ff) +
 
163
                                  (ELF_R_TYPE(rel[i].r_info) >> 8))
 
164
                                 & 0x1fff);
 
165
                        break;
 
166
#endif /* CONFIG_SPARC64 */
 
167
 
 
168
                case R_SPARC_32:
 
169
                case R_SPARC_UA32:
 
170
                        location[0] = v >> 24;
 
171
                        location[1] = v >> 16;
 
172
                        location[2] = v >>  8;
 
173
                        location[3] = v >>  0;
 
174
                        break;
 
175
 
 
176
                case R_SPARC_WDISP30:
 
177
                        v -= (Elf_Addr) location;
 
178
                        *loc32 = (*loc32 & ~0x3fffffff) |
 
179
                                ((v >> 2) & 0x3fffffff);
 
180
                        break;
 
181
 
 
182
                case R_SPARC_WDISP22:
 
183
                        v -= (Elf_Addr) location;
 
184
                        *loc32 = (*loc32 & ~0x3fffff) |
 
185
                                ((v >> 2) & 0x3fffff);
 
186
                        break;
 
187
 
 
188
                case R_SPARC_LO10:
 
189
                        *loc32 = (*loc32 & ~0x3ff) | (v & 0x3ff);
 
190
                        break;
 
191
 
 
192
                case R_SPARC_HI22:
 
193
                        *loc32 = (*loc32 & ~0x3fffff) |
 
194
                                ((v >> 10) & 0x3fffff);
 
195
                        break;
 
196
 
 
197
                default:
 
198
                        printk(KERN_ERR "module %s: Unknown relocation: %x\n",
 
199
                               me->name,
 
200
                               (int) (ELF_R_TYPE(rel[i].r_info) & 0xff));
 
201
                        return -ENOEXEC;
 
202
                }
 
203
        }
 
204
        return 0;
 
205
}
 
206
 
 
207
#ifdef CONFIG_SPARC64
 
208
static void do_patch_sections(const Elf_Ehdr *hdr,
 
209
                              const Elf_Shdr *sechdrs)
 
210
{
 
211
        const Elf_Shdr *s, *sun4v_1insn = NULL, *sun4v_2insn = NULL;
 
212
        char *secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
 
213
 
 
214
        for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) {
 
215
                if (!strcmp(".sun4v_1insn_patch", secstrings + s->sh_name))
 
216
                        sun4v_1insn = s;
 
217
                if (!strcmp(".sun4v_2insn_patch", secstrings + s->sh_name))
 
218
                        sun4v_2insn = s;
 
219
        }
 
220
 
 
221
        if (sun4v_1insn && tlb_type == hypervisor) {
 
222
                void *p = (void *) sun4v_1insn->sh_addr;
 
223
                sun4v_patch_1insn_range(p, p + sun4v_1insn->sh_size);
 
224
        }
 
225
        if (sun4v_2insn && tlb_type == hypervisor) {
 
226
                void *p = (void *) sun4v_2insn->sh_addr;
 
227
                sun4v_patch_2insn_range(p, p + sun4v_2insn->sh_size);
 
228
        }
 
229
}
 
230
 
 
231
int module_finalize(const Elf_Ehdr *hdr,
 
232
                    const Elf_Shdr *sechdrs,
 
233
                    struct module *me)
 
234
{
 
235
        /* make jump label nops */
 
236
        jump_label_apply_nops(me);
 
237
 
 
238
        do_patch_sections(hdr, sechdrs);
 
239
 
 
240
        /* Cheetah's I-cache is fully coherent.  */
 
241
        if (tlb_type == spitfire) {
 
242
                unsigned long va;
 
243
 
 
244
                flushw_all();
 
245
                for (va =  0; va < (PAGE_SIZE << 1); va += 32)
 
246
                        spitfire_put_icache_tag(va, 0x0);
 
247
                __asm__ __volatile__("flush %g6");
 
248
        }
 
249
 
 
250
        return 0;
 
251
}
 
252
#endif /* CONFIG_SPARC64 */