1 // SPDX-License-Identifier: GPL-2.0 !! 1 // SPDX-License-Identifier: GPL-2.0-or-later
2 // Copyright (C) 2018 Hangzhou C-SKY Microsyst !! 2 /* Kernel module help for Alpha.
>> 3 Copyright (C) 2002 Richard Henderson.
3 4
>> 5 */
4 #include <linux/moduleloader.h> 6 #include <linux/moduleloader.h>
5 #include <linux/elf.h> 7 #include <linux/elf.h>
6 #include <linux/mm.h> <<
7 #include <linux/vmalloc.h> 8 #include <linux/vmalloc.h>
8 #include <linux/slab.h> <<
9 #include <linux/fs.h> 9 #include <linux/fs.h>
10 #include <linux/string.h> 10 #include <linux/string.h>
11 #include <linux/kernel.h> 11 #include <linux/kernel.h>
12 #include <linux/spinlock.h> !! 12 #include <linux/slab.h>
13 13
14 #ifdef CONFIG_CPU_CK810 !! 14 #if 0
15 #define IS_BSR32(hi16, lo16) (((hi1 !! 15 #define DEBUGP printk
16 #define IS_JSRI32(hi16, lo16) ((hi16 !! 16 #else
17 !! 17 #define DEBUGP(fmt...)
18 #define CHANGE_JSRI_TO_LRW(addr) do { !! 18 #endif
19 *(uint16_t *)(addr) = (*(uint16_t *)(a <<
20 *((uint16_t *)(addr) + 1) = *((uint16_ <<
21 } while (0) <<
22 <<
23 #define SET_JSR32_R26(addr) do { <<
24 *(uint16_t *)(addr) = 0xE8Fa; <<
25 *((uint16_t *)(addr) + 1) = 0x0000; <<
26 } while (0) <<
27 19
28 static void jsri_2_lrw_jsr(uint32_t *location) !! 20 /* Allocate the GOT at the end of the core sections. */
>> 21
>> 22 struct got_entry {
>> 23 struct got_entry *next;
>> 24 Elf64_Sxword r_addend;
>> 25 int got_offset;
>> 26 };
>> 27
>> 28 static inline void
>> 29 process_reloc_for_got(Elf64_Rela *rela,
>> 30 struct got_entry *chains, Elf64_Xword *poffset)
29 { 31 {
30 uint16_t *location_tmp = (uint16_t *)l !! 32 unsigned long r_sym = ELF64_R_SYM (rela->r_info);
>> 33 unsigned long r_type = ELF64_R_TYPE (rela->r_info);
>> 34 Elf64_Sxword r_addend = rela->r_addend;
>> 35 struct got_entry *g;
31 36
32 if (IS_BSR32(*location_tmp, *(location !! 37 if (r_type != R_ALPHA_LITERAL)
33 return; 38 return;
34 39
35 if (IS_JSRI32(*location_tmp, *(locatio !! 40 for (g = chains + r_sym; g ; g = g->next)
36 /* jsri 0x... --> lrw r26, 0x !! 41 if (g->r_addend == r_addend) {
37 CHANGE_JSRI_TO_LRW(location); !! 42 if (g->got_offset == 0) {
38 /* lsli r0, r0 --> jsr r26 */ !! 43 g->got_offset = *poffset;
39 SET_JSR32_R26(location + 1); !! 44 *poffset += 8;
40 } !! 45 }
>> 46 goto found_entry;
>> 47 }
>> 48
>> 49 g = kmalloc (sizeof (*g), GFP_KERNEL);
>> 50 g->next = chains[r_sym].next;
>> 51 g->r_addend = r_addend;
>> 52 g->got_offset = *poffset;
>> 53 *poffset += 8;
>> 54 chains[r_sym].next = g;
>> 55
>> 56 found_entry:
>> 57 /* Trick: most of the ELF64_R_TYPE field is unused. There are
>> 58 42 valid relocation types, and a 32-bit field. Co-opt the
>> 59 bits above 256 to store the got offset for this reloc. */
>> 60 rela->r_info |= g->got_offset << 8;
41 } 61 }
42 #else !! 62
43 static inline void jsri_2_lrw_jsr(uint32_t *lo !! 63 int
>> 64 module_frob_arch_sections(Elf64_Ehdr *hdr, Elf64_Shdr *sechdrs,
>> 65 char *secstrings, struct module *me)
44 { 66 {
45 return; !! 67 struct got_entry *chains;
>> 68 Elf64_Rela *rela;
>> 69 Elf64_Shdr *esechdrs, *symtab, *s, *got;
>> 70 unsigned long nsyms, nrela, i;
>> 71
>> 72 esechdrs = sechdrs + hdr->e_shnum;
>> 73 symtab = got = NULL;
>> 74
>> 75 /* Find out how large the symbol table is. Allocate one got_entry
>> 76 head per symbol. Normally this will be enough, but not always.
>> 77 We'll chain different offsets for the symbol down each head. */
>> 78 for (s = sechdrs; s < esechdrs; ++s)
>> 79 if (s->sh_type == SHT_SYMTAB)
>> 80 symtab = s;
>> 81 else if (!strcmp(".got", secstrings + s->sh_name)) {
>> 82 got = s;
>> 83 me->arch.gotsecindex = s - sechdrs;
>> 84 }
>> 85
>> 86 if (!symtab) {
>> 87 printk(KERN_ERR "module %s: no symbol table\n", me->name);
>> 88 return -ENOEXEC;
>> 89 }
>> 90 if (!got) {
>> 91 printk(KERN_ERR "module %s: no got section\n", me->name);
>> 92 return -ENOEXEC;
>> 93 }
>> 94
>> 95 nsyms = symtab->sh_size / sizeof(Elf64_Sym);
>> 96 chains = kcalloc(nsyms, sizeof(struct got_entry), GFP_KERNEL);
>> 97 if (!chains) {
>> 98 printk(KERN_ERR
>> 99 "module %s: no memory for symbol chain buffer\n",
>> 100 me->name);
>> 101 return -ENOMEM;
>> 102 }
>> 103
>> 104 got->sh_size = 0;
>> 105 got->sh_addralign = 8;
>> 106 got->sh_type = SHT_NOBITS;
>> 107
>> 108 /* Examine all LITERAL relocations to find out what GOT entries
>> 109 are required. This sizes the GOT section as well. */
>> 110 for (s = sechdrs; s < esechdrs; ++s)
>> 111 if (s->sh_type == SHT_RELA) {
>> 112 nrela = s->sh_size / sizeof(Elf64_Rela);
>> 113 rela = (void *)hdr + s->sh_offset;
>> 114 for (i = 0; i < nrela; ++i)
>> 115 process_reloc_for_got(rela+i, chains,
>> 116 &got->sh_size);
>> 117 }
>> 118
>> 119 /* Free the memory we allocated. */
>> 120 for (i = 0; i < nsyms; ++i) {
>> 121 struct got_entry *g, *n;
>> 122 for (g = chains[i].next; g ; g = n) {
>> 123 n = g->next;
>> 124 kfree(g);
>> 125 }
>> 126 }
>> 127 kfree(chains);
>> 128
>> 129 return 0;
46 } 130 }
47 #endif <<
48 131
49 int apply_relocate_add(Elf32_Shdr *sechdrs, co !! 132 int
50 unsigned int symindex, unsigne !! 133 apply_relocate_add(Elf64_Shdr *sechdrs, const char *strtab,
>> 134 unsigned int symindex, unsigned int relsec,
>> 135 struct module *me)
51 { 136 {
52 unsigned int i; !! 137 Elf64_Rela *rela = (void *)sechdrs[relsec].sh_addr;
53 Elf32_Rela *rel = (void *) sechdr !! 138 unsigned long i, n = sechdrs[relsec].sh_size / sizeof(*rela);
54 Elf32_Sym *sym; !! 139 Elf64_Sym *symtab, *sym;
55 uint32_t *location; !! 140 void *base, *location;
56 short *temp; !! 141 unsigned long got, gp;
57 !! 142
58 for (i = 0; i < sechdrs[relsec].sh_siz !! 143 DEBUGP("Applying relocate section %u to %u\n", relsec,
59 /* This is where to make the c !! 144 sechdrs[relsec].sh_info);
60 location = (void *)sechdrs[sec !! 145
61 !! 146 base = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr;
62 sym = (Elf32_Sym *)sechdrs[sym !! 147 symtab = (Elf64_Sym *)sechdrs[symindex].sh_addr;
63 !! 148
64 !! 149 /* The small sections were sorted to the end of the segment.
65 switch (ELF32_R_TYPE(rel[i].r_ !! 150 The following should definitely cover them. */
66 case R_CSKY_32: !! 151 gp = (u64)me->core_layout.base + me->core_layout.size - 0x8000;
67 /* We add the value in !! 152 got = sechdrs[me->arch.gotsecindex].sh_addr;
68 *location = rel[i].r_a !! 153
69 break; !! 154 for (i = 0; i < n; i++) {
70 case R_CSKY_PC32: !! 155 unsigned long r_sym = ELF64_R_SYM (rela[i].r_info);
71 /* Add the value, subt !! 156 unsigned long r_type = ELF64_R_TYPE (rela[i].r_info);
72 *location = rel[i].r_a !! 157 unsigned long r_got_offset = r_type >> 8;
73 !! 158 unsigned long value, hi, lo;
74 break; !! 159 r_type &= 0xff;
75 case R_CSKY_PCRELJSR_IMM11BY2: !! 160
76 break; !! 161 /* This is where to make the change. */
77 case R_CSKY_PCRELJSR_IMM26BY2: !! 162 location = base + rela[i].r_offset;
78 jsri_2_lrw_jsr(locatio !! 163
79 break; !! 164 /* This is the symbol it is referring to. Note that all
80 case R_CSKY_ADDR_HI16: !! 165 unresolved symbols have been resolved. */
81 temp = ((short *)loca !! 166 sym = symtab + r_sym;
82 *temp = (short) !! 167 value = sym->st_value + rela[i].r_addend;
83 ((rel[i].r_add !! 168
84 break; !! 169 switch (r_type) {
85 case R_CSKY_ADDR_LO16: !! 170 case R_ALPHA_NONE:
86 temp = ((short *)loca !! 171 break;
87 *temp = (short) !! 172 case R_ALPHA_REFLONG:
88 ((rel[i].r_add !! 173 *(u32 *)location = value;
>> 174 break;
>> 175 case R_ALPHA_REFQUAD:
>> 176 /* BUG() can produce misaligned relocations. */
>> 177 ((u32 *)location)[0] = value;
>> 178 ((u32 *)location)[1] = value >> 32;
>> 179 break;
>> 180 case R_ALPHA_GPREL32:
>> 181 value -= gp;
>> 182 if ((int)value != value)
>> 183 goto reloc_overflow;
>> 184 *(u32 *)location = value;
>> 185 break;
>> 186 case R_ALPHA_LITERAL:
>> 187 hi = got + r_got_offset;
>> 188 lo = hi - gp;
>> 189 if ((short)lo != lo)
>> 190 goto reloc_overflow;
>> 191 *(u16 *)location = lo;
>> 192 *(u64 *)hi = value;
>> 193 break;
>> 194 case R_ALPHA_LITUSE:
>> 195 break;
>> 196 case R_ALPHA_GPDISP:
>> 197 value = gp - (u64)location;
>> 198 lo = (short)value;
>> 199 hi = (int)(value - lo);
>> 200 if (hi + lo != value)
>> 201 goto reloc_overflow;
>> 202 *(u16 *)location = hi >> 16;
>> 203 *(u16 *)(location + rela[i].r_addend) = lo;
>> 204 break;
>> 205 case R_ALPHA_BRSGP:
>> 206 /* BRSGP is only allowed to bind to local symbols.
>> 207 If the section is undef, this means that the
>> 208 value was resolved from somewhere else. */
>> 209 if (sym->st_shndx == SHN_UNDEF)
>> 210 goto reloc_overflow;
>> 211 if ((sym->st_other & STO_ALPHA_STD_GPLOAD) ==
>> 212 STO_ALPHA_STD_GPLOAD)
>> 213 /* Omit the prologue. */
>> 214 value += 8;
>> 215 fallthrough;
>> 216 case R_ALPHA_BRADDR:
>> 217 value -= (u64)location + 4;
>> 218 if (value & 3)
>> 219 goto reloc_overflow;
>> 220 value = (long)value >> 2;
>> 221 if (value + (1<<21) >= 1<<22)
>> 222 goto reloc_overflow;
>> 223 value &= 0x1fffff;
>> 224 value |= *(u32 *)location & ~0x1fffff;
>> 225 *(u32 *)location = value;
>> 226 break;
>> 227 case R_ALPHA_HINT:
>> 228 break;
>> 229 case R_ALPHA_SREL32:
>> 230 value -= (u64)location;
>> 231 if ((int)value != value)
>> 232 goto reloc_overflow;
>> 233 *(u32 *)location = value;
>> 234 break;
>> 235 case R_ALPHA_SREL64:
>> 236 value -= (u64)location;
>> 237 *(u64 *)location = value;
>> 238 break;
>> 239 case R_ALPHA_GPRELHIGH:
>> 240 value = (long)(value - gp + 0x8000) >> 16;
>> 241 if ((short) value != value)
>> 242 goto reloc_overflow;
>> 243 *(u16 *)location = value;
>> 244 break;
>> 245 case R_ALPHA_GPRELLOW:
>> 246 value -= gp;
>> 247 *(u16 *)location = value;
>> 248 break;
>> 249 case R_ALPHA_GPREL16:
>> 250 value -= gp;
>> 251 if ((short) value != value)
>> 252 goto reloc_overflow;
>> 253 *(u16 *)location = value;
89 break; 254 break;
90 default: 255 default:
91 pr_err("module %s: Unk !! 256 printk(KERN_ERR "module %s: Unknown relocation: %lu\n",
92 me->name, ELF3 !! 257 me->name, r_type);
>> 258 return -ENOEXEC;
>> 259 reloc_overflow:
>> 260 if (ELF64_ST_TYPE (sym->st_info) == STT_SECTION)
>> 261 printk(KERN_ERR
>> 262 "module %s: Relocation (type %lu) overflow vs section %d\n",
>> 263 me->name, r_type, sym->st_shndx);
>> 264 else
>> 265 printk(KERN_ERR
>> 266 "module %s: Relocation (type %lu) overflow vs %s\n",
>> 267 me->name, r_type, strtab + sym->st_name);
93 return -ENOEXEC; 268 return -ENOEXEC;
94 } 269 }
95 } 270 }
>> 271
96 return 0; 272 return 0;
97 } 273 }
98 274
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