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We stopped adding "Contributed by" or similar lines in sources in 2012 in favour of git logs and keeping the Contributors section of the glibc manual up to date. Removing these lines makes the license header a bit more consistent across files and also removes the possibility of error in attribution when license blocks or files are copied across since the contributed-by lines don't actually reflect reality in those cases. Move all "Contributed by" and similar lines (Written by, Test by, etc.) into a new file CONTRIBUTED-BY to retain record of these contributions. These contributors are also mentioned in manual/contrib.texi, so we just maintain this additional record as a courtesy to the earlier developers. The following scripts were used to filter a list of files to edit in place and to clean up the CONTRIBUTED-BY file respectively. These were not added to the glibc sources because they're not expected to be of any use in future given that this is a one time task: https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
513 lines
14 KiB
C
513 lines
14 KiB
C
/* PLT trampoline. MIPS version.
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Copyright (C) 1996-2021 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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/* FIXME: Profiling of shared libraries is not implemented yet. */
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#include <sysdep.h>
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#include <link.h>
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#include <elf.h>
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#include <ldsodefs.h>
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#include <dl-machine.h>
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#include <sysdep-cancel.h>
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/* Get link map for callers object containing STUB_PC. */
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static inline struct link_map *
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elf_machine_runtime_link_map (ElfW(Addr) gpreg, ElfW(Addr) stub_pc)
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{
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extern int _dl_mips_gnu_objects;
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/* got[1] is reserved to keep its link map address for the shared
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object generated by the gnu linker. If all are such objects, we
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can find the link map from current GPREG simply. If not so, get
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the link map for caller's object containing STUB_PC. */
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if (_dl_mips_gnu_objects)
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{
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ElfW(Addr) *got = elf_mips_got_from_gpreg (gpreg);
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ElfW(Word) g1;
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g1 = ((ElfW(Word) *) got)[1];
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if ((g1 & ELF_MIPS_GNU_GOT1_MASK) != 0)
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{
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struct link_map *l =
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(struct link_map *) (g1 & ~ELF_MIPS_GNU_GOT1_MASK);
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ElfW(Addr) base, limit;
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const ElfW(Phdr) *p = l->l_phdr;
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ElfW(Half) this, nent = l->l_phnum;
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/* For the common case of a stub being called from the containing
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object, STUB_PC will point to somewhere within the object that
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is described by the link map fetched via got[1]. Otherwise we
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have to scan all maps. */
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for (this = 0; this < nent; this++)
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{
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if (p[this].p_type == PT_LOAD)
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{
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base = p[this].p_vaddr + l->l_addr;
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limit = base + p[this].p_memsz;
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if (stub_pc >= base && stub_pc < limit)
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return l;
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}
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}
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}
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}
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struct link_map *l;
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Lmid_t nsid;
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for (nsid = 0; nsid < DL_NNS; ++nsid)
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for (l = GL(dl_ns)[nsid]._ns_loaded; l != NULL; l = l->l_next)
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{
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ElfW(Addr) base, limit;
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const ElfW(Phdr) *p = l->l_phdr;
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ElfW(Half) this, nent = l->l_phnum;
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for (this = 0; this < nent; ++this)
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{
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if (p[this].p_type == PT_LOAD)
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{
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base = p[this].p_vaddr + l->l_addr;
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limit = base + p[this].p_memsz;
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if (stub_pc >= base && stub_pc < limit)
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return l;
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}
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}
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}
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_dl_signal_error (0, NULL, NULL, "cannot find runtime link map");
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return NULL;
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}
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/* Define mips specific runtime resolver. The function __dl_runtime_resolve
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is called from assembler function _dl_runtime_resolve which converts
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special argument registers t7 ($15) and t8 ($24):
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t7 address to return to the caller of the function
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t8 index for this function symbol in .dynsym
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to usual c arguments.
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Other architectures call fixup from dl-runtime.c in
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_dl_runtime_resolve. MIPS instead calls __dl_runtime_resolve. We
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have to use our own version because of the way the got section is
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treated on MIPS (we've also got ELF_MACHINE_PLT defined). */
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/* The flag _dl_mips_gnu_objects is set if all dynamic objects are
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generated by the gnu linker. */
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int _dl_mips_gnu_objects = 1;
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/* This is called from assembly stubs below which the compiler can't see. */
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static ElfW(Addr)
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__dl_runtime_resolve (ElfW(Word), ElfW(Word), ElfW(Addr), ElfW(Addr))
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__attribute_used__;
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static ElfW(Addr)
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__dl_runtime_resolve (ElfW(Word) sym_index,
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ElfW(Word) return_address,
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ElfW(Addr) old_gpreg,
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ElfW(Addr) stub_pc)
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{
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struct link_map *l = elf_machine_runtime_link_map (old_gpreg, stub_pc);
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const ElfW(Sym) *const symtab
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= (const ElfW(Sym) *) D_PTR (l, l_info[DT_SYMTAB]);
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const char *strtab = (const void *) D_PTR (l, l_info[DT_STRTAB]);
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ElfW(Addr) *got
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= (ElfW(Addr) *) D_PTR (l, l_info[DT_PLTGOT]);
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const ElfW(Word) local_gotno
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= (const ElfW(Word)) l->l_info[DT_MIPS (LOCAL_GOTNO)]->d_un.d_val;
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const ElfW(Word) gotsym
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= (const ElfW(Word)) l->l_info[DT_MIPS (GOTSYM)]->d_un.d_val;
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const ElfW(Sym) *sym = &symtab[sym_index];
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struct link_map *sym_map;
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ElfW(Addr) value;
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/* FIXME: The symbol versioning stuff is not tested yet. */
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if (__builtin_expect (ELFW(ST_VISIBILITY) (sym->st_other), 0) == 0)
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{
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switch (l->l_info[VERSYMIDX (DT_VERSYM)] != NULL ? 1 : 0)
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{
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default:
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{
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const ElfW(Half) *vernum =
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(const void *) D_PTR (l, l_info[VERSYMIDX (DT_VERSYM)]);
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ElfW(Half) ndx = vernum[sym_index] & 0x7fff;
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const struct r_found_version *version = &l->l_versions[ndx];
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if (version->hash != 0)
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{
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/* We need to keep the scope around so do some locking. This is
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not necessary for objects which cannot be unloaded or when
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we are not using any threads (yet). */
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if (!RTLD_SINGLE_THREAD_P)
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THREAD_GSCOPE_SET_FLAG ();
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sym_map = _dl_lookup_symbol_x (strtab + sym->st_name, l,
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&sym, l->l_scope, version,
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ELF_RTYPE_CLASS_PLT, 0, 0);
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/* We are done with the global scope. */
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if (!RTLD_SINGLE_THREAD_P)
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THREAD_GSCOPE_RESET_FLAG ();
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break;
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}
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}
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/* Fall through. */
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case 0:
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{
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/* We need to keep the scope around so do some locking. This is
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not necessary for objects which cannot be unloaded or when
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we are not using any threads (yet). */
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int flags = DL_LOOKUP_ADD_DEPENDENCY;
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if (!RTLD_SINGLE_THREAD_P)
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{
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THREAD_GSCOPE_SET_FLAG ();
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flags |= DL_LOOKUP_GSCOPE_LOCK;
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}
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sym_map = _dl_lookup_symbol_x (strtab + sym->st_name, l, &sym,
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l->l_scope, 0, ELF_RTYPE_CLASS_PLT,
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flags, 0);
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/* We are done with the global scope. */
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if (!RTLD_SINGLE_THREAD_P)
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THREAD_GSCOPE_RESET_FLAG ();
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}
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}
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/* Currently value contains the base load address of the object
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that defines sym. Now add in the symbol offset. */
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value = SYMBOL_ADDRESS (sym_map, sym, true);
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}
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else
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/* We already found the symbol. The module (and therefore its load
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address) is also known. */
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value = SYMBOL_ADDRESS (l, sym, true);
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/* Apply the relocation with that value. */
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*(got + local_gotno + sym_index - gotsym) = value;
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return value;
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}
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#if _MIPS_SIM == _ABIO32
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#define ELF_DL_FRAME_SIZE 40
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#define ELF_DL_SAVE_ARG_REGS "\
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sw $15, 36($29)\n \
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sw $4, 16($29)\n \
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sw $5, 20($29)\n \
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sw $6, 24($29)\n \
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sw $7, 28($29)\n \
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"
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#define ELF_DL_RESTORE_ARG_REGS "\
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lw $31, 36($29)\n \
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lw $4, 16($29)\n \
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lw $5, 20($29)\n \
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lw $6, 24($29)\n \
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lw $7, 28($29)\n \
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"
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/* The PLT resolver should also save and restore $2 and $3, which are used
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as arguments to MIPS16 stub functions. */
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#define ELF_DL_PLT_FRAME_SIZE 48
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#define ELF_DL_PLT_SAVE_ARG_REGS \
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ELF_DL_SAVE_ARG_REGS "\
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sw $2, 40($29)\n \
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sw $3, 44($29)\n \
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"
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#define ELF_DL_PLT_RESTORE_ARG_REGS \
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ELF_DL_RESTORE_ARG_REGS "\
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lw $2, 40($29)\n \
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lw $3, 44($29)\n \
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"
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#define IFABIO32(X) X
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#define IFNEWABI(X)
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#else /* _MIPS_SIM == _ABIN32 || _MIPS_SIM == _ABI64 */
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#define ELF_DL_FRAME_SIZE 80
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#define ELF_DL_SAVE_ARG_REGS "\
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sd $15, 72($29)\n \
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sd $4, 8($29)\n \
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sd $5, 16($29)\n \
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sd $6, 24($29)\n \
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sd $7, 32($29)\n \
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sd $8, 40($29)\n \
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sd $9, 48($29)\n \
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sd $10, 56($29)\n \
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sd $11, 64($29)\n \
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"
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#define ELF_DL_RESTORE_ARG_REGS "\
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ld $31, 72($29)\n \
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ld $4, 8($29)\n \
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ld $5, 16($29)\n \
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ld $6, 24($29)\n \
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ld $7, 32($29)\n \
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ld $8, 40($29)\n \
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ld $9, 48($29)\n \
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ld $10, 56($29)\n \
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ld $11, 64($29)\n \
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"
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/* The PLT resolver should also save and restore $2 and $3, which are used
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as arguments to MIPS16 stub functions. */
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#define ELF_DL_PLT_FRAME_SIZE 96
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#define ELF_DL_PLT_SAVE_ARG_REGS \
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ELF_DL_SAVE_ARG_REGS "\
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sd $2, 80($29)\n \
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sd $3, 88($29)\n \
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"
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#define ELF_DL_PLT_RESTORE_ARG_REGS \
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ELF_DL_RESTORE_ARG_REGS "\
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ld $2, 80($29)\n \
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ld $3, 88($29)\n \
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"
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#define IFABIO32(X)
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#define IFNEWABI(X) X
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#endif
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#ifndef __mips16
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asm ("\n\
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.text\n\
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.align 2\n\
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.set nomips16\n\
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.globl _dl_runtime_resolve\n\
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.type _dl_runtime_resolve,@function\n\
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.ent _dl_runtime_resolve\n\
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_dl_runtime_resolve:\n\
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.frame $29, " STRINGXP(ELF_DL_FRAME_SIZE) ", $31\n\
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.set noreorder\n\
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# Save GP.\n\
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1: move $3, $28\n\
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# Save arguments and sp value in stack.\n\
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" STRINGXP(PTR_SUBIU) " $29, " STRINGXP(ELF_DL_FRAME_SIZE) "\n\
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# Modify t9 ($25) so as to point .cpload instruction.\n\
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" IFABIO32(STRINGXP(PTR_ADDIU) " $25, (2f-1b)\n") "\
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# Compute GP.\n\
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2: " STRINGXP(SETUP_GP) "\n\
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" STRINGXV(SETUP_GP64 (0, _dl_runtime_resolve)) "\n\
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.set reorder\n\
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# Save slot call pc.\n\
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move $2, $31\n\
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" IFABIO32(STRINGXP(CPRESTORE(32))) "\n\
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" ELF_DL_SAVE_ARG_REGS "\
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move $4, $24\n\
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move $5, $15\n\
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move $6, $3\n\
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move $7, $2\n\
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jal __dl_runtime_resolve\n\
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" ELF_DL_RESTORE_ARG_REGS "\
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" STRINGXP(RESTORE_GP64) "\n\
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" STRINGXP(PTR_ADDIU) " $29, " STRINGXP(ELF_DL_FRAME_SIZE) "\n\
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move $25, $2\n\
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jr $25\n\
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.end _dl_runtime_resolve\n\
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.previous\n\
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");
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/* Assembler veneer called from the PLT header code when using PLTs.
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Code in each PLT entry and the PLT header fills in the arguments to
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this function:
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- $15 (o32 t7, n32/n64 t3) - caller's return address
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- $24 (t8) - PLT entry index
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- $25 (t9) - address of _dl_runtime_pltresolve
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- o32 $28 (gp), n32/n64 $14 (t2) - address of .got.plt
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Different registers are used for .got.plt because the ABI was
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originally designed for o32, where gp was available (call
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clobbered). On n32/n64 gp is call saved.
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_dl_fixup needs:
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- $4 (a0) - link map address
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- $5 (a1) - .rel.plt offset (== PLT entry index * 8) */
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asm ("\n\
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.text\n\
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.align 2\n\
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.set nomips16\n\
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.globl _dl_runtime_pltresolve\n\
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.type _dl_runtime_pltresolve,@function\n\
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.ent _dl_runtime_pltresolve\n\
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_dl_runtime_pltresolve:\n\
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.frame $29, " STRINGXP(ELF_DL_PLT_FRAME_SIZE) ", $31\n\
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.set noreorder\n\
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# Save arguments and sp value in stack.\n\
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1: " STRINGXP(PTR_SUBIU) " $29, " STRINGXP(ELF_DL_PLT_FRAME_SIZE) "\n\
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" IFABIO32(STRINGXP(PTR_L) " $13, " STRINGXP(PTRSIZE) "($28)") "\n\
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" IFNEWABI(STRINGXP(PTR_L) " $13, " STRINGXP(PTRSIZE) "($14)") "\n\
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# Modify t9 ($25) so as to point .cpload instruction.\n\
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" IFABIO32(STRINGXP(PTR_ADDIU) " $25, (2f-1b)\n") "\
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# Compute GP.\n\
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2: " STRINGXP(SETUP_GP) "\n\
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" STRINGXV(SETUP_GP64 (0, _dl_runtime_pltresolve)) "\n\
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.set reorder\n\
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" IFABIO32(STRINGXP(CPRESTORE(32))) "\n\
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" ELF_DL_PLT_SAVE_ARG_REGS "\
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move $4, $13\n\
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sll $5, $24, " STRINGXP(PTRLOG) " + 1\n\
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jal _dl_fixup\n\
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move $25, $2\n\
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" ELF_DL_PLT_RESTORE_ARG_REGS "\
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" STRINGXP(RESTORE_GP64) "\n\
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" STRINGXP(PTR_ADDIU) " $29, " STRINGXP(ELF_DL_PLT_FRAME_SIZE) "\n\
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jr $25\n\
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.end _dl_runtime_pltresolve\n\
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.previous\n\
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");
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#elif _MIPS_SIM == _ABIO32 /* __mips16 */
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/* MIPS16 version, O32 only. */
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asm ("\n\
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.text\n\
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.align 2\n\
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.set mips16\n\
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.globl _dl_runtime_resolve\n\
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.type _dl_runtime_resolve,@function\n\
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.ent _dl_runtime_resolve\n\
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_dl_runtime_resolve:\n\
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.frame $29, " STRINGXP (ELF_DL_FRAME_SIZE) ", $31\n\
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# Save arguments and sp value in stack.\n\t"
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# if _MIPS_ISA >= _MIPS_ISA_MIPS32
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"save " STRINGXP (ELF_DL_FRAME_SIZE) ", $4-$7, $ra\n\t"
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# else
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"addiu $sp, -" STRINGXP (ELF_DL_FRAME_SIZE) "\n\
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sw $7, 32($sp)\n\
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sw $6, 28($sp)\n\
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sw $5, 24($sp)\n\
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sw $4, 20($sp)\n\t"
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# endif
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"# Preserve caller's $ra, for RESTORE instruction below.\n\
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move $5, $15\n\
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sw $5, 36($sp)\n\
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# Compute GP into $2.\n\
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li $2, %hi(_gp_disp)\n\
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addiu $3, $pc, %lo(_gp_disp)\n\
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sll $2, 16\n\
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addu $2, $3\n\
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lw $3, %got(__dl_runtime_resolve)($2)\n\
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move $4, $24\n\
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addiu $3, %lo(__dl_runtime_resolve)\n\
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move $7, $ra\n\
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move $6, $28\n\
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move $25, $3\n\
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jalr $3\n\t"
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# if _MIPS_ISA >= _MIPS_ISA_MIPS32
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"restore " STRINGXP(ELF_DL_FRAME_SIZE) ", $4-$7, $ra\n\t"
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# else
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"# Restore $ra, move placed further down to hide latency.\n\
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lw $4, 36($sp)\n\
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lw $5, 24($sp)\n\
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lw $6, 28($sp)\n\
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lw $7, 32($sp)\n\
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move $ra, $4\n\
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lw $4, 20($sp)\n\
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addiu $sp, " STRINGXP(ELF_DL_FRAME_SIZE) "\n\t"
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|
# endif
|
|
"move $25, $2\n\
|
|
jr $2\n\
|
|
.end _dl_runtime_resolve\n\
|
|
.previous\n\
|
|
");
|
|
|
|
asm ("\n\
|
|
.text\n\
|
|
.align 2\n\
|
|
.set mips16\n\
|
|
.globl _dl_runtime_pltresolve\n\
|
|
.type _dl_runtime_pltresolve,@function\n\
|
|
.ent _dl_runtime_pltresolve\n\
|
|
_dl_runtime_pltresolve:\n\
|
|
.frame $29, " STRINGXP(ELF_DL_PLT_FRAME_SIZE) ", $31\n\
|
|
# Save arguments and sp value in stack.\n\t"
|
|
# if _MIPS_ISA >= _MIPS_ISA_MIPS32
|
|
"save " STRINGXP(ELF_DL_PLT_FRAME_SIZE) ", $4-$7, $ra\n\t"
|
|
# else
|
|
"addiu $sp, -" STRINGXP(ELF_DL_PLT_FRAME_SIZE) "\n\
|
|
sw $7, 40($sp)\n\
|
|
sw $6, 36($sp)\n\
|
|
sw $5, 32($sp)\n\
|
|
sw $4, 28($sp)\n\t"
|
|
# endif
|
|
"# Preserve MIPS16 stub function arguments.\n\
|
|
sw $3, 20($sp)\n\
|
|
sw $2, 16($sp)\n\
|
|
# Preserve caller's $ra, for RESTORE instruction below.\n\
|
|
move $3, $15\n\
|
|
sw $3, 44($sp)\n\
|
|
# Compute GP into $2.\n\
|
|
li $2, %hi(_gp_disp)\n\
|
|
addiu $3, $pc, %lo(_gp_disp)\n\
|
|
sll $2, 16\n\
|
|
addu $2, $3\n\
|
|
# Save GP value in slot.\n\
|
|
sw $2, 24($sp)\n\
|
|
# Load _dl_fixup address.\n\
|
|
lw $6, %call16(_dl_fixup)($2)\n\
|
|
# Load link map address.\n\
|
|
move $3, $28\n\
|
|
lw $4, " STRINGXP (PTRSIZE) "($3)\n\
|
|
move $5, $24\n\
|
|
sll $5, " STRINGXP (PTRLOG) " + 1\n\
|
|
# Call _dl_fixup.\n\
|
|
move $25, $6\n\
|
|
jalr $6\n\
|
|
move $25, $2\n\
|
|
# Reload GP value into $28.\n\
|
|
lw $3, 24($sp)\n\
|
|
move $28, $3\n\
|
|
lw $3, 16($sp)\n\
|
|
move $15, $3\n\
|
|
lw $3, 20($sp)\n\t"
|
|
# if _MIPS_ISA >= _MIPS_ISA_MIPS32
|
|
"restore " STRINGXP (ELF_DL_PLT_FRAME_SIZE) ", $4-$7, $ra\n\t"
|
|
# else
|
|
"# Restore $ra, move placed further down to hide latency.\n\
|
|
lw $4, 44($sp)\n\
|
|
lw $5, 32($sp)\n\
|
|
lw $6, 36($sp)\n\
|
|
lw $7, 40($sp)\n\
|
|
move $ra, $4\n\
|
|
lw $4, 28($sp)\n\
|
|
addiu $sp, " STRINGXP (ELF_DL_PLT_FRAME_SIZE) "\n\t"
|
|
# endif
|
|
".set noreorder\n\
|
|
jr $2\n\
|
|
move $2, $15\n\
|
|
.set reorder\n\
|
|
.end _dl_runtime_pltresolve\n\
|
|
.previous\n\
|
|
");
|
|
|
|
#else /* __mips16 && _MIPS_SIM != _ABIO32 */
|
|
# error "MIPS16 support for N32/N64 not implemented"
|
|
|
|
#endif /* __mips16 */
|