297 lines
8.8 KiB
C
297 lines
8.8 KiB
C
/* Machine-dependent ELF dynamic relocation inline functions. OpenRISC version.
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Copyright (C) 2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef dl_machine_h
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#define dl_machine_h
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#define ELF_MACHINE_NAME "or1k"
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <tls.h>
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#include <dl-irel.h>
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#include <dl-static-tls.h>
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#include <dl-machine-rel.h>
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/* Return nonzero iff ELF header is compatible with the running host. */
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static inline int __attribute__ ((unused))
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elf_machine_matches_host (const Elf32_Ehdr *ehdr)
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{
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return ehdr->e_machine == EM_OPENRISC;
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}
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static inline Elf32_Addr *
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or1k_get_got (void)
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{
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Elf32_Addr *got;
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asm ("l.jal 0x8\n"
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" l.movhi %0, gotpchi(_GLOBAL_OFFSET_TABLE_-4)\n"
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"l.ori %0, %0, gotpclo(_GLOBAL_OFFSET_TABLE_+0)\n"
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"l.add %0, %0, r9\n"
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: "=r" (got) : : "r9");
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return got;
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}
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/* Return the link-time address of _DYNAMIC. Conveniently, this is the
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first element of the GOT. */
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static inline Elf32_Addr
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elf_machine_dynamic (void)
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{
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Elf32_Addr *got = or1k_get_got ();
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return *got;
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}
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/* Return the run-time load address of the shared object. */
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static inline Elf32_Addr
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elf_machine_load_address (void)
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{
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/* Compute the difference between the runtime address of _DYNAMIC as seen
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by a GOTOFF reference, and the link-time address found in the special
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unrelocated first GOT entry. */
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Elf32_Addr dyn;
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Elf32_Addr *got = or1k_get_got ();
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asm ("l.movhi %0, gotoffhi(_DYNAMIC);"
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"l.ori %0, %0, gotofflo(_DYNAMIC);"
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"l.add %0, %0, %1;"
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: "=&r"(dyn) : "r"(got));
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return dyn - *got;
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}
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/* Initial entry point code for the dynamic linker. The function _dl_start
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is the real entry point; it's return value is the user program's entry
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point.
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Code is really located in dl-start.S, just tell the linker that it
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exists. */
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#define RTLD_START asm (".globl _dl_start");
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/* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry or
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TLS variable, so undefined references should not be allowed to
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define the value.
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ELF_RTYPE_CLASS_NOCOPY iff TYPE should not be allowed to resolve to one
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of the main executable's symbols, as for a COPY reloc. */
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#define elf_machine_type_class(type) \
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(((type) == R_OR1K_JMP_SLOT \
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|| (type) == R_OR1K_TLS_DTPMOD \
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|| (type) == R_OR1K_TLS_DTPOFF \
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|| (type) == R_OR1K_TLS_TPOFF) * ELF_RTYPE_CLASS_PLT \
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| ((type) == R_OR1K_COPY) * ELF_RTYPE_CLASS_COPY)
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/* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */
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#define ELF_MACHINE_JMP_SLOT R_OR1K_JMP_SLOT
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#define ARCH_LA_PLTENTER or1k_gnu_pltenter
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#define ARCH_LA_PLTEXIT or1k_gnu_pltexit
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/* Set up the loaded object described by L so its unrelocated PLT
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entries will jump to the on-demand fixup code in dl-runtime.c. */
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static inline int __attribute__ ((unused, always_inline))
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elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[],
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int lazy, int profile)
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{
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ElfW(Addr) *pltgot;
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extern void _dl_runtime_resolve (ElfW(Word));
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extern void _dl_runtime_profile (ElfW(Word));
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if (l->l_info[DT_JMPREL] && lazy)
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{
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pltgot = (ElfW(Addr) *) D_PTR (l, l_info[DT_PLTGOT]);
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/* Fill in initial entrys of the plt */
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/* Register the link_map address in the plt at pltgot[1].
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This will also be used in the resolver for accessing the
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link_map structure. */
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pltgot[1] = (ElfW(Addr)) l;
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/* This function will get called to fix up the GOT entry and
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then jump to the resolved address. */
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pltgot[2] = (ElfW(Addr)) &_dl_runtime_resolve;
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}
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return lazy;
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}
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/* Mask identifying addresses reserved for the user program,
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where the dynamic linker should not map anything. */
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#define ELF_MACHINE_USER_ADDRESS_MASK 0xf8000000UL
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/* We define an initialization functions. This is called very early in
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_dl_sysdep_start. */
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#define DL_PLATFORM_INIT dl_platform_init ()
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static inline void __attribute__ ((unused))
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dl_platform_init (void)
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{
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if (GLRO(dl_platform) != NULL && *GLRO(dl_platform) == '\0')
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/* Avoid an empty string which would disturb us. */
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GLRO(dl_platform) = NULL;
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}
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static inline ElfW(Addr)
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elf_machine_fixup_plt (struct link_map *map, lookup_t t,
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const ElfW(Sym) *refsym, const ElfW(Sym) *sym,
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const ElfW(Rela) *reloc,
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ElfW(Addr) *reloc_addr, ElfW(Addr) value)
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{
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return *reloc_addr = value;
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}
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/* Return the final value of a plt relocation. */
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static inline Elf32_Addr
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elf_machine_plt_value (struct link_map *map, const Elf32_Rela *reloc,
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Elf32_Addr value)
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{
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return value + reloc->r_addend;
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}
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#endif /* !dl_machine_h */
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#ifdef RESOLVE_MAP
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/* Perform the relocation specified by RELOC and SYM (which is fully resolved).
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MAP is the object containing the reloc. */
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static inline void
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__attribute ((always_inline))
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elf_machine_rela (struct link_map *map, struct r_scope_elem *scope[],
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const ElfW(Rela) *reloc, const ElfW(Sym) *sym,
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const struct r_found_version *version,
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void *const reloc_addr_arg, int skip_ifunc)
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{
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Elf32_Addr *const reloc_addr = reloc_addr_arg;
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const unsigned int r_type = ELF32_R_TYPE (reloc->r_info);
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if (__glibc_unlikely (r_type == R_OR1K_NONE))
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return;
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else
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{
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const Elf32_Sym *const refsym = sym;
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struct link_map *sym_map = RESOLVE_MAP (map, scope, &sym, version,
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r_type);
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Elf32_Addr value = SYMBOL_ADDRESS (sym_map, sym, true);
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if (sym != NULL
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&& __glibc_unlikely (ELFW(ST_TYPE) (sym->st_info) == STT_GNU_IFUNC)
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&& __glibc_likely (sym->st_shndx != SHN_UNDEF)
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&& __glibc_likely (!skip_ifunc))
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value = elf_ifunc_invoke (value);
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switch (r_type)
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{
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case R_OR1K_COPY:
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if (sym == NULL)
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/* This can happen in trace mode if an object could not be
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found. */
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break;
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if (__glibc_unlikely (sym->st_size > refsym->st_size)
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|| (__glibc_unlikely (sym->st_size < refsym->st_size)
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&& GLRO(dl_verbose)))
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{
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const char *strtab;
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strtab = (const char *) D_PTR (map, l_info[DT_STRTAB]);
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_dl_error_printf ("\
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%s: Symbol `%s' has different size in shared object, consider re-linking\n",
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rtld_progname ?: "<program name unknown>",
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strtab + refsym->st_name);
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}
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memcpy (reloc_addr_arg, (void *) value,
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MIN (sym->st_size, refsym->st_size));
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break;
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case R_OR1K_32:
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/* Support relocations on mis-aligned offsets. */
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value += reloc->r_addend;
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memcpy (reloc_addr_arg, &value, 4);
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break;
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case R_OR1K_GLOB_DAT:
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case R_OR1K_JMP_SLOT:
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*reloc_addr = value + reloc->r_addend;
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break;
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case R_OR1K_TLS_DTPMOD:
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# ifdef RTLD_BOOTSTRAP
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/* During startup the dynamic linker is always the module
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with index 1. */
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*reloc_addr = 1;
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# else
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if (sym_map != NULL)
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*reloc_addr = sym_map->l_tls_modid;
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# endif
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break;
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case R_OR1K_TLS_DTPOFF:
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# ifndef RTLD_BOOTSTRAP
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*reloc_addr = (sym == NULL ? 0 : sym->st_value) + reloc->r_addend;
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# endif
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break;
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case R_OR1K_TLS_TPOFF:
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# ifdef RTLD_BOOTSTRAP
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*reloc_addr = sym->st_value + reloc->r_addend +
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map->l_tls_offset - TLS_TCB_SIZE;
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# else
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if (sym_map != NULL)
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{
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CHECK_STATIC_TLS (map, sym_map);
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*reloc_addr = sym->st_value + reloc->r_addend +
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sym_map->l_tls_offset - TLS_TCB_SIZE;
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}
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# endif
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break;
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default:
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_dl_reloc_bad_type (map, r_type, 0);
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break;
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}
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}
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}
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static inline void
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__attribute__ ((always_inline))
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elf_machine_rela_relative (Elf32_Addr l_addr, const Elf32_Rela *reloc,
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void *const reloc_addr_arg)
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{
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Elf32_Addr *const reloc_addr = reloc_addr_arg;
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*reloc_addr = l_addr + reloc->r_addend;
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}
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static inline void
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__attribute__ ((always_inline))
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elf_machine_lazy_rel (struct link_map *map, struct r_scope_elem *scope[],
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ElfW(Addr) l_addr, const ElfW(Rela) *reloc,
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int skip_ifunc)
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{
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Elf32_Addr *const reloc_addr = (void *) (l_addr + reloc->r_offset);
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const unsigned int r_type = ELF32_R_TYPE (reloc->r_info);
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if (__glibc_likely (r_type == R_OR1K_JMP_SLOT))
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*reloc_addr += l_addr;
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else if (__glibc_unlikely (r_type == R_OR1K_NONE))
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return;
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else
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_dl_reloc_bad_type (map, r_type, 1);
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}
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#endif /* RESOLVE_MAP */
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