Commit | Line | Data |
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5a0015d6 | 1 | /* |
f30c2269 | 2 | * arch/xtensa/kernel/module.c |
5a0015d6 CZ |
3 | * |
4 | * Module support. | |
5 | * | |
6 | * This file is subject to the terms and conditions of the GNU General Public | |
7 | * License. See the file "COPYING" in the main directory of this archive | |
8 | * for more details. | |
9 | * | |
ff6fd469 | 10 | * Copyright (C) 2001 - 2006 Tensilica Inc. |
5a0015d6 CZ |
11 | * |
12 | * Chris Zankel <chris@zankel.net> | |
13 | * | |
14 | */ | |
15 | ||
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 | ||
ff6fd469 | 25 | #undef DEBUG_RELOCATE |
5a0015d6 | 26 | |
ff6fd469 CZ |
27 | static int |
28 | decode_calln_opcode (unsigned char *location) | |
29 | { | |
30 | #ifdef __XTENSA_EB__ | |
31 | return (location[0] & 0xf0) == 0x50; | |
32 | #endif | |
33 | #ifdef __XTENSA_EL__ | |
34 | return (location[0] & 0xf) == 0x5; | |
35 | #endif | |
36 | } | |
37 | ||
38 | static int | |
39 | decode_l32r_opcode (unsigned char *location) | |
40 | { | |
41 | #ifdef __XTENSA_EB__ | |
42 | return (location[0] & 0xf0) == 0x10; | |
43 | #endif | |
44 | #ifdef __XTENSA_EL__ | |
45 | return (location[0] & 0xf) == 0x1; | |
46 | #endif | |
5a0015d6 CZ |
47 | } |
48 | ||
5a0015d6 CZ |
49 | int apply_relocate_add(Elf32_Shdr *sechdrs, |
50 | const char *strtab, | |
51 | unsigned int symindex, | |
52 | unsigned int relsec, | |
ff6fd469 | 53 | struct module *mod) |
5a0015d6 | 54 | { |
ff6fd469 | 55 | unsigned int i; |
c4c4594b | 56 | Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr; |
ff6fd469 CZ |
57 | Elf32_Sym *sym; |
58 | unsigned char *location; | |
59 | uint32_t value; | |
60 | ||
61 | #ifdef DEBUG_RELOCATE | |
62 | printk("Applying relocate section %u to %u\n", relsec, | |
63 | sechdrs[relsec].sh_info); | |
64 | #endif | |
65 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) { | |
66 | location = (char *)sechdrs[sechdrs[relsec].sh_info].sh_addr | |
67 | + rela[i].r_offset; | |
68 | sym = (Elf32_Sym *)sechdrs[symindex].sh_addr | |
69 | + ELF32_R_SYM(rela[i].r_info); | |
70 | value = sym->st_value + rela[i].r_addend; | |
71 | ||
72 | switch (ELF32_R_TYPE(rela[i].r_info)) { | |
73 | case R_XTENSA_NONE: | |
74 | case R_XTENSA_DIFF8: | |
75 | case R_XTENSA_DIFF16: | |
76 | case R_XTENSA_DIFF32: | |
77 | case R_XTENSA_ASM_EXPAND: | |
78 | break; | |
79 | ||
80 | case R_XTENSA_32: | |
81 | case R_XTENSA_PLT: | |
82 | *(uint32_t *)location += value; | |
83 | break; | |
84 | ||
85 | case R_XTENSA_SLOT0_OP: | |
86 | if (decode_calln_opcode(location)) { | |
87 | value -= ((unsigned long)location & -4) + 4; | |
88 | if ((value & 3) != 0 || | |
89 | ((value + (1 << 19)) >> 20) != 0) { | |
90 | printk("%s: relocation out of range, " | |
91 | "section %d reloc %d " | |
92 | "sym '%s'\n", | |
93 | mod->name, relsec, i, | |
94 | strtab + sym->st_name); | |
95 | return -ENOEXEC; | |
96 | } | |
97 | value = (signed int)value >> 2; | |
98 | #ifdef __XTENSA_EB__ | |
99 | location[0] = ((location[0] & ~0x3) | | |
100 | ((value >> 16) & 0x3)); | |
101 | location[1] = (value >> 8) & 0xff; | |
102 | location[2] = value & 0xff; | |
103 | #endif | |
104 | #ifdef __XTENSA_EL__ | |
105 | location[0] = ((location[0] & ~0xc0) | | |
106 | ((value << 6) & 0xc0)); | |
107 | location[1] = (value >> 2) & 0xff; | |
108 | location[2] = (value >> 10) & 0xff; | |
109 | #endif | |
110 | } else if (decode_l32r_opcode(location)) { | |
111 | value -= (((unsigned long)location + 3) & -4); | |
112 | if ((value & 3) != 0 || | |
113 | (signed int)value >> 18 != -1) { | |
114 | printk("%s: relocation out of range, " | |
115 | "section %d reloc %d " | |
116 | "sym '%s'\n", | |
117 | mod->name, relsec, i, | |
118 | strtab + sym->st_name); | |
119 | return -ENOEXEC; | |
120 | } | |
121 | value = (signed int)value >> 2; | |
122 | ||
123 | #ifdef __XTENSA_EB__ | |
124 | location[1] = (value >> 8) & 0xff; | |
125 | location[2] = value & 0xff; | |
126 | #endif | |
127 | #ifdef __XTENSA_EL__ | |
128 | location[1] = value & 0xff; | |
129 | location[2] = (value >> 8) & 0xff; | |
130 | #endif | |
131 | } | |
132 | /* FIXME: Ignore any other opcodes. The Xtensa | |
133 | assembler currently assumes that the linker will | |
134 | always do relaxation and so all PC-relative | |
135 | operands need relocations. (The assembler also | |
136 | writes out the tentative PC-relative values, | |
137 | assuming no link-time relaxation, so it is usually | |
138 | safe to ignore the relocations.) If the | |
139 | assembler's "--no-link-relax" flag can be made to | |
140 | work, and if all kernel modules can be assembled | |
141 | with that flag, then unexpected relocations could | |
142 | be detected here. */ | |
143 | break; | |
144 | ||
145 | case R_XTENSA_SLOT1_OP: | |
146 | case R_XTENSA_SLOT2_OP: | |
147 | case R_XTENSA_SLOT3_OP: | |
148 | case R_XTENSA_SLOT4_OP: | |
149 | case R_XTENSA_SLOT5_OP: | |
150 | case R_XTENSA_SLOT6_OP: | |
151 | case R_XTENSA_SLOT7_OP: | |
152 | case R_XTENSA_SLOT8_OP: | |
153 | case R_XTENSA_SLOT9_OP: | |
154 | case R_XTENSA_SLOT10_OP: | |
155 | case R_XTENSA_SLOT11_OP: | |
156 | case R_XTENSA_SLOT12_OP: | |
157 | case R_XTENSA_SLOT13_OP: | |
158 | case R_XTENSA_SLOT14_OP: | |
159 | printk("%s: unexpected FLIX relocation: %u\n", | |
160 | mod->name, | |
161 | ELF32_R_TYPE(rela[i].r_info)); | |
162 | return -ENOEXEC; | |
163 | ||
164 | case R_XTENSA_SLOT0_ALT: | |
165 | case R_XTENSA_SLOT1_ALT: | |
166 | case R_XTENSA_SLOT2_ALT: | |
167 | case R_XTENSA_SLOT3_ALT: | |
168 | case R_XTENSA_SLOT4_ALT: | |
169 | case R_XTENSA_SLOT5_ALT: | |
170 | case R_XTENSA_SLOT6_ALT: | |
171 | case R_XTENSA_SLOT7_ALT: | |
172 | case R_XTENSA_SLOT8_ALT: | |
173 | case R_XTENSA_SLOT9_ALT: | |
174 | case R_XTENSA_SLOT10_ALT: | |
175 | case R_XTENSA_SLOT11_ALT: | |
176 | case R_XTENSA_SLOT12_ALT: | |
177 | case R_XTENSA_SLOT13_ALT: | |
178 | case R_XTENSA_SLOT14_ALT: | |
179 | printk("%s: unexpected ALT relocation: %u\n", | |
180 | mod->name, | |
181 | ELF32_R_TYPE(rela[i].r_info)); | |
182 | return -ENOEXEC; | |
183 | ||
184 | default: | |
185 | printk("%s: unexpected relocation: %u\n", | |
186 | mod->name, | |
187 | ELF32_R_TYPE(rela[i].r_info)); | |
188 | return -ENOEXEC; | |
189 | } | |
190 | } | |
191 | return 0; | |
5a0015d6 | 192 | } |