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| 1 | /* Copyright (C) 1995-2022 Free Software Foundation, Inc. |
|---|---|
| 2 | |
| 3 | This file is part of the GNU C Library. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public License as |
| 7 | published by the Free Software Foundation; either version 2.1 of the |
| 8 | License, or (at your option) any later version. |
| 9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library; if not, see |
| 17 | <https://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #ifndef dl_machine_h |
| 20 | #define dl_machine_h |
| 21 | |
| 22 | #define ELF_MACHINE_NAME "microblaze" |
| 23 | |
| 24 | #include <sys/param.h> |
| 25 | #include <tls.h> |
| 26 | #include <dl-static-tls.h> |
| 27 | #include <dl-machine-rel.h> |
| 28 | |
| 29 | /* Return nonzero iff ELF header is compatible with the running host. */ |
| 30 | static inline int |
| 31 | elf_machine_matches_host (const Elf32_Ehdr *ehdr) |
| 32 | { |
| 33 | return (ehdr->e_machine == EM_MICROBLAZE); |
| 34 | } |
| 35 | |
| 36 | /* Return the link-time address of _DYNAMIC. Conveniently, this is the |
| 37 | first element of the GOT. This must be inlined in a function which |
| 38 | uses global data. */ |
| 39 | static inline Elf32_Addr |
| 40 | elf_machine_dynamic (void) |
| 41 | { |
| 42 | /* This produces a GOTOFF reloc that resolves to zero at link time, so in |
| 43 | fact just loads from the GOT register directly. By doing it without |
| 44 | an asm we can let the compiler choose any register. */ |
| 45 | |
| 46 | Elf32_Addr got_entry_0; |
| 47 | __asm__ __volatile__( |
| 48 | "lwi %0,r20,0" |
| 49 | :"=r"(got_entry_0) |
| 50 | ); |
| 51 | return got_entry_0; |
| 52 | } |
| 53 | |
| 54 | /* Return the run-time load address of the shared object. */ |
| 55 | static inline Elf32_Addr |
| 56 | elf_machine_load_address (void) |
| 57 | { |
| 58 | /* Compute the difference between the runtime address of _DYNAMIC as seen |
| 59 | by a GOTOFF reference, and the link-time address found in the special |
| 60 | unrelocated first GOT entry. */ |
| 61 | |
| 62 | Elf32_Addr dyn; |
| 63 | __asm__ __volatile__ ( |
| 64 | "addik %0,r20,_DYNAMIC@GOTOFF" |
| 65 | : "=r"(dyn) |
| 66 | ); |
| 67 | return dyn - elf_machine_dynamic (); |
| 68 | } |
| 69 | |
| 70 | /* Set up the loaded object described by L so its unrelocated PLT |
| 71 | entries will jump to the on-demand fixup code in dl-runtime.c. */ |
| 72 | |
| 73 | static inline int __attribute__ ((always_inline)) |
| 74 | elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[], |
| 75 | int lazy, int profile) |
| 76 | { |
| 77 | extern void _dl_runtime_resolve (Elf32_Word); |
| 78 | extern void _dl_runtime_profile (Elf32_Word); |
| 79 | |
| 80 | return lazy; |
| 81 | } |
| 82 | |
| 83 | /* The PLT uses Elf32_Rela relocs. */ |
| 84 | #define elf_machine_relplt elf_machine_rela |
| 85 | |
| 86 | /* Mask identifying addresses reserved for the user program, |
| 87 | where the dynamic linker should not map anything. */ |
| 88 | #define ELF_MACHINE_USER_ADDRESS_MASK 0x80000000UL |
| 89 | |
| 90 | /* Initial entry point code for the dynamic linker. |
| 91 | The C function `_dl_start' is the real entry point; |
| 92 | its return value is the user program's entry point. */ |
| 93 | |
| 94 | #define RTLD_START asm ("\ |
| 95 | .text\n\ |
| 96 | .globl _start\n\ |
| 97 | .type _start,@function\n\ |
| 98 | _start:\n\ |
| 99 | addk r5,r0,r1\n\ |
| 100 | addk r3,r0,r0\n\ |
| 101 | 1:\n\ |
| 102 | addik r5,r5,4\n\ |
| 103 | lw r4,r5,r0\n\ |
| 104 | bneid r4,1b\n\ |
| 105 | addik r3,r3,1\n\ |
| 106 | addik r3,r3,-1\n\ |
| 107 | addk r5,r0,r1\n\ |
| 108 | sw r3,r5,r0\n\ |
| 109 | addik r1,r1,-24\n\ |
| 110 | sw r15,r1,r0\n\ |
| 111 | brlid r15,_dl_start\n\ |
| 112 | nop\n\ |
| 113 | /* FALLTHRU. */\n\ |
| 114 | \n\ |
| 115 | .globl _dl_start_user\n\ |
| 116 | .type _dl_start_user,@function\n\ |
| 117 | _dl_start_user:\n\ |
| 118 | mfs r20,rpc\n\ |
| 119 | addik r20,r20,_GLOBAL_OFFSET_TABLE_+8\n\ |
| 120 | lwi r4,r20,_dl_skip_args@GOTOFF\n\ |
| 121 | lwi r5,r1,24\n\ |
| 122 | rsubk r5,r4,r5\n\ |
| 123 | addk r4,r4,r4\n\ |
| 124 | addk r4,r4,r4\n\ |
| 125 | addk r1,r1,r4\n\ |
| 126 | swi r5,r1,24\n\ |
| 127 | swi r3,r1,20\n\ |
| 128 | addk r6,r5,r0\n\ |
| 129 | addk r5,r5,r5\n\ |
| 130 | addk r5,r5,r5\n\ |
| 131 | addik r7,r1,28\n\ |
| 132 | addk r8,r7,r5\n\ |
| 133 | addik r8,r8,4\n\ |
| 134 | lwi r5,r20,_rtld_local@GOTOFF\n\ |
| 135 | brlid r15,_dl_init\n\ |
| 136 | nop\n\ |
| 137 | lwi r5,r1,24\n\ |
| 138 | lwi r3,r1,20\n\ |
| 139 | addk r4,r5,r5\n\ |
| 140 | addk r4,r4,r4\n\ |
| 141 | addik r6,r1,28\n\ |
| 142 | addk r7,r6,r4\n\ |
| 143 | addik r7,r7,4\n\ |
| 144 | addik r15,r20,_dl_fini@GOTOFF\n\ |
| 145 | addik r15,r15,-8\n\ |
| 146 | brad r3\n\ |
| 147 | addik r1,r1,24\n\ |
| 148 | nop\n\ |
| 149 | .size _dl_start_user, . - _dl_start_user\n\ |
| 150 | .previous"); |
| 151 | |
| 152 | /* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry or |
| 153 | TLS variable, so undefined references should not be allowed to |
| 154 | define the value. |
| 155 | ELF_RTYPE_CLASS_COPY iff TYPE should not be allowed to resolve to one |
| 156 | of the main executable's symbols, as for a COPY reloc. */ |
| 157 | #ifndef RTLD_BOOTSTRAP |
| 158 | # define elf_machine_type_class(type) \ |
| 159 | (((type) == R_MICROBLAZE_JUMP_SLOT \ |
| 160 | || (type) == R_MICROBLAZE_TLSDTPREL32 \ |
| 161 | || (type) == R_MICROBLAZE_TLSDTPMOD32 \ |
| 162 | || (type) == R_MICROBLAZE_TLSTPREL32) \ |
| 163 | * ELF_RTYPE_CLASS_PLT \ |
| 164 | | ((type) == R_MICROBLAZE_COPY) * ELF_RTYPE_CLASS_COPY) |
| 165 | #else |
| 166 | # define elf_machine_type_class(type) \ |
| 167 | (((type) == R_MICROBLAZE_JUMP_SLOT) * ELF_RTYPE_CLASS_PLT \ |
| 168 | | ((type) == R_MICROBLAZE_COPY) * ELF_RTYPE_CLASS_COPY) |
| 169 | #endif |
| 170 | |
| 171 | /* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */ |
| 172 | #define ELF_MACHINE_JMP_SLOT R_MICROBLAZE_JUMP_SLOT |
| 173 | |
| 174 | static inline Elf32_Addr |
| 175 | elf_machine_fixup_plt (struct link_map *map, lookup_t t, |
| 176 | const ElfW(Sym) *refsym, const ElfW(Sym) *sym, |
| 177 | const Elf32_Rela *reloc, |
| 178 | Elf32_Addr *reloc_addr, Elf32_Addr value) |
| 179 | { |
| 180 | return *reloc_addr = value; |
| 181 | } |
| 182 | |
| 183 | /* Return the final value of a plt relocation. Ignore the addend. */ |
| 184 | static inline Elf32_Addr |
| 185 | elf_machine_plt_value (struct link_map *map, const Elf32_Rela *reloc, |
| 186 | Elf32_Addr value) |
| 187 | { |
| 188 | return value; |
| 189 | } |
| 190 | |
| 191 | #endif /* !dl_machine_h. */ |
| 192 | |
| 193 | /* Names of the architecture-specific auditing callback functions. */ |
| 194 | #define ARCH_LA_PLTENTER microblaze_gnu_pltenter |
| 195 | #define ARCH_LA_PLTEXIT microblaze_gnu_pltexit |
| 196 | |
| 197 | #ifdef RESOLVE_MAP |
| 198 | |
| 199 | /* Perform the relocation specified by RELOC and SYM (which is fully resolved). |
| 200 | MAP is the object containing the reloc. */ |
| 201 | |
| 202 | /* Macro to put 32-bit relocation value into 2 words. */ |
| 203 | #define PUT_REL_64(rel_addr,val) \ |
| 204 | do { \ |
| 205 | ((unsigned short *)(rel_addr))[1] = (val) >> 16; \ |
| 206 | ((unsigned short *)(rel_addr))[3] = (val) & 0xffff; \ |
| 207 | } while (0) |
| 208 | |
| 209 | static inline void __attribute__ ((always_inline)) |
| 210 | elf_machine_rela (struct link_map *map, struct r_scope_elem *scope[], |
| 211 | const Elf32_Rela *reloc, const Elf32_Sym *sym, |
| 212 | const struct r_found_version *version, |
| 213 | void *const reloc_addr_arg, int skip_ifunc) |
| 214 | { |
| 215 | Elf32_Addr *const reloc_addr = reloc_addr_arg; |
| 216 | const int r_type = ELF32_R_TYPE (reloc->r_info); |
| 217 | |
| 218 | if (__builtin_expect (r_type == R_MICROBLAZE_64_PCREL, 0)) |
| 219 | PUT_REL_64 (reloc_addr, map->l_addr + reloc->r_addend); |
| 220 | else if (r_type == R_MICROBLAZE_REL) |
| 221 | *reloc_addr = map->l_addr + reloc->r_addend; |
| 222 | else |
| 223 | { |
| 224 | const Elf32_Sym *const refsym = sym; |
| 225 | struct link_map *sym_map = RESOLVE_MAP (map, scope, &sym, version, |
| 226 | r_type); |
| 227 | Elf32_Addr value = SYMBOL_ADDRESS (sym_map, sym, true); |
| 228 | |
| 229 | value += reloc->r_addend; |
| 230 | if (r_type == R_MICROBLAZE_GLOB_DAT |
| 231 | || r_type == R_MICROBLAZE_JUMP_SLOT |
| 232 | || r_type == R_MICROBLAZE_32) |
| 233 | { |
| 234 | *reloc_addr = value; |
| 235 | } |
| 236 | else if (r_type == R_MICROBLAZE_COPY) |
| 237 | { |
| 238 | if (sym != NULL && (sym->st_size > refsym->st_size |
| 239 | || (sym->st_size < refsym->st_size && GLRO (dl_verbose))) ) |
| 240 | { |
| 241 | const char *strtab; |
| 242 | |
| 243 | strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]); |
| 244 | _dl_error_printf ("\ |
| 245 | %s: Symbol `%s' has different size in shared object, consider re-linking\n", |
| 246 | RTLD_PROGNAME, strtab + refsym->st_name); |
| 247 | } |
| 248 | memcpy (reloc_addr_arg, (void *) value, |
| 249 | MIN (sym->st_size, refsym->st_size)); |
| 250 | } |
| 251 | else if (r_type == R_MICROBLAZE_NONE) |
| 252 | { |
| 253 | } |
| 254 | #if !defined RTLD_BOOTSTRAP |
| 255 | else if (r_type == R_MICROBLAZE_TLSDTPMOD32) |
| 256 | { |
| 257 | if (sym_map != NULL) |
| 258 | *reloc_addr = sym_map->l_tls_modid; |
| 259 | } |
| 260 | else if (r_type == R_MICROBLAZE_TLSDTPREL32) |
| 261 | { |
| 262 | if (sym != NULL) |
| 263 | *reloc_addr = sym->st_value + reloc->r_addend; |
| 264 | } |
| 265 | else if (r_type == R_MICROBLAZE_TLSTPREL32) |
| 266 | { |
| 267 | if (sym != NULL) |
| 268 | { |
| 269 | CHECK_STATIC_TLS (map, sym_map); |
| 270 | *reloc_addr = sym->st_value + sym_map->l_tls_offset + reloc->r_addend; |
| 271 | } |
| 272 | } |
| 273 | #endif |
| 274 | else |
| 275 | { |
| 276 | _dl_reloc_bad_type (map, r_type, 0); |
| 277 | } |
| 278 | } |
| 279 | } |
| 280 | |
| 281 | static inline void |
| 282 | elf_machine_rela_relative (Elf32_Addr l_addr, const Elf32_Rela *reloc, |
| 283 | void *const reloc_addr_arg) |
| 284 | { |
| 285 | Elf32_Addr *const reloc_addr = reloc_addr_arg; |
| 286 | PUT_REL_64 (reloc_addr, l_addr + reloc->r_addend); |
| 287 | } |
| 288 | |
| 289 | static inline void |
| 290 | elf_machine_lazy_rel (struct link_map *map, struct r_scope_elem *scope[], |
| 291 | Elf32_Addr l_addr, const Elf32_Rela *reloc, |
| 292 | int skip_ifunc) |
| 293 | { |
| 294 | Elf32_Addr *const reloc_addr = (void *) (l_addr + reloc->r_offset); |
| 295 | if (ELF32_R_TYPE (reloc->r_info) == R_MICROBLAZE_JUMP_SLOT) |
| 296 | *reloc_addr += l_addr; |
| 297 | else |
| 298 | _dl_reloc_bad_type (map, ELF32_R_TYPE (reloc->r_info), 1); |
| 299 | } |
| 300 | |
| 301 | #endif /* RESOLVE_MAP. */ |
| 302 |
Warning: This file is not a C or C++ file. It does not have highlighting.