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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#include <asm/cacheflush.h>
20
21#include "entry.h"
22
23#ifdef CONFIG_SPARC64
24
25#include <linux/jump_label.h>
26
27static void *module_map(unsigned long size)
28{
29 if (PAGE_ALIGN(size) > MODULES_LEN)
30 return NULL;
31 return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END,
32 GFP_KERNEL, PAGE_KERNEL, -1,
33 __builtin_return_address(0));
34}
35#else
36static void *module_map(unsigned long size)
37{
38 return vmalloc(size);
39}
40#endif /* CONFIG_SPARC64 */
41
42void *module_alloc(unsigned long size)
43{
44 void *ret;
45
46 /* We handle the zero case fine, unlike vmalloc */
47 if (size == 0)
48 return NULL;
49
50 ret = module_map(size);
51 if (!ret)
52 ret = ERR_PTR(-ENOMEM);
53 else
54 memset(ret, 0, size);
55
56 return ret;
57}
58
59/* Make generic code ignore STT_REGISTER dummy undefined symbols. */
60int module_frob_arch_sections(Elf_Ehdr *hdr,
61 Elf_Shdr *sechdrs,
62 char *secstrings,
63 struct module *mod)
64{
65 unsigned int symidx;
66 Elf_Sym *sym;
67 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 = (Elf_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 if (ELF_ST_TYPE(sym[i].st_info) == STT_REGISTER)
82 sym[i].st_shndx = SHN_ABS;
83 }
84 }
85 return 0;
86}
87
88int apply_relocate_add(Elf_Shdr *sechdrs,
89 const char *strtab,
90 unsigned int symindex,
91 unsigned int relsec,
92 struct module *me)
93{
94 unsigned int i;
95 Elf_Rela *rel = (void *)sechdrs[relsec].sh_addr;
96 Elf_Sym *sym;
97 u8 *location;
98 u32 *loc32;
99
100 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
101 Elf_Addr v;
102
103 /* This is where to make the change */
104 location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr
105 + rel[i].r_offset;
106 loc32 = (u32 *) location;
107
108#ifdef CONFIG_SPARC64
109 BUG_ON(((u64)location >> (u64)32) != (u64)0);
110#endif /* CONFIG_SPARC64 */
111
112 /* This is the symbol it is referring to. Note that all
113 undefined symbols have been resolved. */
114 sym = (Elf_Sym *)sechdrs[symindex].sh_addr
115 + ELF_R_SYM(rel[i].r_info);
116 v = sym->st_value + rel[i].r_addend;
117
118 switch (ELF_R_TYPE(rel[i].r_info) & 0xff) {
119#ifdef CONFIG_SPARC64
120 case R_SPARC_64:
121 location[0] = v >> 56;
122 location[1] = v >> 48;
123 location[2] = v >> 40;
124 location[3] = v >> 32;
125 location[4] = v >> 24;
126 location[5] = v >> 16;
127 location[6] = v >> 8;
128 location[7] = v >> 0;
129 break;
130
131 case R_SPARC_DISP32:
132 v -= (Elf_Addr) location;
133 *loc32 = v;
134 break;
135
136 case R_SPARC_WDISP19:
137 v -= (Elf_Addr) location;
138 *loc32 = (*loc32 & ~0x7ffff) |
139 ((v >> 2) & 0x7ffff);
140 break;
141
142 case R_SPARC_OLO10:
143 *loc32 = (*loc32 & ~0x1fff) |
144 (((v & 0x3ff) +
145 (ELF_R_TYPE(rel[i].r_info) >> 8))
146 & 0x1fff);
147 break;
148#endif /* CONFIG_SPARC64 */
149
150 case R_SPARC_32:
151 case R_SPARC_UA32:
152 location[0] = v >> 24;
153 location[1] = v >> 16;
154 location[2] = v >> 8;
155 location[3] = v >> 0;
156 break;
157
158 case R_SPARC_WDISP30:
159 v -= (Elf_Addr) location;
160 *loc32 = (*loc32 & ~0x3fffffff) |
161 ((v >> 2) & 0x3fffffff);
162 break;
163
164 case R_SPARC_WDISP22:
165 v -= (Elf_Addr) location;
166 *loc32 = (*loc32 & ~0x3fffff) |
167 ((v >> 2) & 0x3fffff);
168 break;
169
170 case R_SPARC_LO10:
171 *loc32 = (*loc32 & ~0x3ff) | (v & 0x3ff);
172 break;
173
174 case R_SPARC_HI22:
175 *loc32 = (*loc32 & ~0x3fffff) |
176 ((v >> 10) & 0x3fffff);
177 break;
178
179 default:
180 printk(KERN_ERR "module %s: Unknown relocation: %x\n",
181 me->name,
182 (int) (ELF_R_TYPE(rel[i].r_info) & 0xff));
183 return -ENOEXEC;
184 }
185 }
186 return 0;
187}
188
189#ifdef CONFIG_SPARC64
190static void do_patch_sections(const Elf_Ehdr *hdr,
191 const Elf_Shdr *sechdrs)
192{
193 const Elf_Shdr *s, *sun4v_1insn = NULL, *sun4v_2insn = NULL;
194 char *secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
195
196 for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) {
197 if (!strcmp(".sun4v_1insn_patch", secstrings + s->sh_name))
198 sun4v_1insn = s;
199 if (!strcmp(".sun4v_2insn_patch", secstrings + s->sh_name))
200 sun4v_2insn = s;
201 }
202
203 if (sun4v_1insn && tlb_type == hypervisor) {
204 void *p = (void *) sun4v_1insn->sh_addr;
205 sun4v_patch_1insn_range(p, p + sun4v_1insn->sh_size);
206 }
207 if (sun4v_2insn && tlb_type == hypervisor) {
208 void *p = (void *) sun4v_2insn->sh_addr;
209 sun4v_patch_2insn_range(p, p + sun4v_2insn->sh_size);
210 }
211}
212
213int module_finalize(const Elf_Ehdr *hdr,
214 const Elf_Shdr *sechdrs,
215 struct module *me)
216{
217 /* make jump label nops */
218 jump_label_apply_nops(me);
219
220 do_patch_sections(hdr, sechdrs);
221
222 /* Cheetah's I-cache is fully coherent. */
223 if (tlb_type == spitfire) {
224 unsigned long va;
225
226 flushw_all();
227 for (va = 0; va < (PAGE_SIZE << 1); va += 32)
228 spitfire_put_icache_tag(va, 0x0);
229 __asm__ __volatile__("flush %g6");
230 }
231
232 return 0;
233}
234#endif /* CONFIG_SPARC64 */