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16#include <linux/module.h>
17#include <linux/moduleloader.h>
18#include <linux/elf.h>
19#include <linux/vmalloc.h>
20#include <linux/fs.h>
21#include <linux/string.h>
22#include <linux/kernel.h>
23#include <linux/cache.h>
24
25#undef DEBUG_RELOCATE
26
27void *module_alloc(unsigned long size)
28{
29 if (size == 0)
30 return NULL;
31 return vmalloc_exec(size);
32}
33
34void module_free(struct module *mod, void *module_region)
35{
36 vfree(module_region);
37}
38
39int module_frob_arch_sections(Elf32_Ehdr *hdr,
40 Elf32_Shdr *sechdrs,
41 char *secstrings,
42 struct module *mod)
43{
44 return 0;
45}
46
47static int
48decode_calln_opcode (unsigned char *location)
49{
50#ifdef __XTENSA_EB__
51 return (location[0] & 0xf0) == 0x50;
52#endif
53#ifdef __XTENSA_EL__
54 return (location[0] & 0xf) == 0x5;
55#endif
56}
57
58static int
59decode_l32r_opcode (unsigned char *location)
60{
61#ifdef __XTENSA_EB__
62 return (location[0] & 0xf0) == 0x10;
63#endif
64#ifdef __XTENSA_EL__
65 return (location[0] & 0xf) == 0x1;
66#endif
67}
68
69int apply_relocate(Elf32_Shdr *sechdrs,
70 const char *strtab,
71 unsigned int symindex,
72 unsigned int relsec,
73 struct module *mod)
74{
75 printk(KERN_ERR "module %s: REL RELOCATION unsupported\n",
76 mod->name);
77 return -ENOEXEC;
78
79}
80
81int apply_relocate_add(Elf32_Shdr *sechdrs,
82 const char *strtab,
83 unsigned int symindex,
84 unsigned int relsec,
85 struct module *mod)
86{
87 unsigned int i;
88 Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr;
89 Elf32_Sym *sym;
90 unsigned char *location;
91 uint32_t value;
92
93#ifdef DEBUG_RELOCATE
94 printk("Applying relocate section %u to %u\n", relsec,
95 sechdrs[relsec].sh_info);
96#endif
97 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {
98 location = (char *)sechdrs[sechdrs[relsec].sh_info].sh_addr
99 + rela[i].r_offset;
100 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
101 + ELF32_R_SYM(rela[i].r_info);
102 value = sym->st_value + rela[i].r_addend;
103
104 switch (ELF32_R_TYPE(rela[i].r_info)) {
105 case R_XTENSA_NONE:
106 case R_XTENSA_DIFF8:
107 case R_XTENSA_DIFF16:
108 case R_XTENSA_DIFF32:
109 case R_XTENSA_ASM_EXPAND:
110 break;
111
112 case R_XTENSA_32:
113 case R_XTENSA_PLT:
114 *(uint32_t *)location += value;
115 break;
116
117 case R_XTENSA_SLOT0_OP:
118 if (decode_calln_opcode(location)) {
119 value -= ((unsigned long)location & -4) + 4;
120 if ((value & 3) != 0 ||
121 ((value + (1 << 19)) >> 20) != 0) {
122 printk("%s: relocation out of range, "
123 "section %d reloc %d "
124 "sym '%s'\n",
125 mod->name, relsec, i,
126 strtab + sym->st_name);
127 return -ENOEXEC;
128 }
129 value = (signed int)value >> 2;
130#ifdef __XTENSA_EB__
131 location[0] = ((location[0] & ~0x3) |
132 ((value >> 16) & 0x3));
133 location[1] = (value >> 8) & 0xff;
134 location[2] = value & 0xff;
135#endif
136#ifdef __XTENSA_EL__
137 location[0] = ((location[0] & ~0xc0) |
138 ((value << 6) & 0xc0));
139 location[1] = (value >> 2) & 0xff;
140 location[2] = (value >> 10) & 0xff;
141#endif
142 } else if (decode_l32r_opcode(location)) {
143 value -= (((unsigned long)location + 3) & -4);
144 if ((value & 3) != 0 ||
145 (signed int)value >> 18 != -1) {
146 printk("%s: relocation out of range, "
147 "section %d reloc %d "
148 "sym '%s'\n",
149 mod->name, relsec, i,
150 strtab + sym->st_name);
151 return -ENOEXEC;
152 }
153 value = (signed int)value >> 2;
154
155#ifdef __XTENSA_EB__
156 location[1] = (value >> 8) & 0xff;
157 location[2] = value & 0xff;
158#endif
159#ifdef __XTENSA_EL__
160 location[1] = value & 0xff;
161 location[2] = (value >> 8) & 0xff;
162#endif
163 }
164
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174
175 break;
176
177 case R_XTENSA_SLOT1_OP:
178 case R_XTENSA_SLOT2_OP:
179 case R_XTENSA_SLOT3_OP:
180 case R_XTENSA_SLOT4_OP:
181 case R_XTENSA_SLOT5_OP:
182 case R_XTENSA_SLOT6_OP:
183 case R_XTENSA_SLOT7_OP:
184 case R_XTENSA_SLOT8_OP:
185 case R_XTENSA_SLOT9_OP:
186 case R_XTENSA_SLOT10_OP:
187 case R_XTENSA_SLOT11_OP:
188 case R_XTENSA_SLOT12_OP:
189 case R_XTENSA_SLOT13_OP:
190 case R_XTENSA_SLOT14_OP:
191 printk("%s: unexpected FLIX relocation: %u\n",
192 mod->name,
193 ELF32_R_TYPE(rela[i].r_info));
194 return -ENOEXEC;
195
196 case R_XTENSA_SLOT0_ALT:
197 case R_XTENSA_SLOT1_ALT:
198 case R_XTENSA_SLOT2_ALT:
199 case R_XTENSA_SLOT3_ALT:
200 case R_XTENSA_SLOT4_ALT:
201 case R_XTENSA_SLOT5_ALT:
202 case R_XTENSA_SLOT6_ALT:
203 case R_XTENSA_SLOT7_ALT:
204 case R_XTENSA_SLOT8_ALT:
205 case R_XTENSA_SLOT9_ALT:
206 case R_XTENSA_SLOT10_ALT:
207 case R_XTENSA_SLOT11_ALT:
208 case R_XTENSA_SLOT12_ALT:
209 case R_XTENSA_SLOT13_ALT:
210 case R_XTENSA_SLOT14_ALT:
211 printk("%s: unexpected ALT relocation: %u\n",
212 mod->name,
213 ELF32_R_TYPE(rela[i].r_info));
214 return -ENOEXEC;
215
216 default:
217 printk("%s: unexpected relocation: %u\n",
218 mod->name,
219 ELF32_R_TYPE(rela[i].r_info));
220 return -ENOEXEC;
221 }
222 }
223 return 0;
224}
225
226int module_finalize(const Elf_Ehdr *hdr,
227 const Elf_Shdr *sechdrs,
228 struct module *mod)
229{
230 return 0;
231}
232
233void module_arch_cleanup(struct module *mod)
234{
235}
236
