577 lines
17 KiB
C
577 lines
17 KiB
C
/* Machine-dependent ELF dynamic relocation inline functions. MIPS version.
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Copyright (C) 1996, 1997, 1999, 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Kazumoto Kojima <kkojima@info.kanagawa-u.ac.jp>.
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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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#ifndef dl_machine_h
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#define dl_machine_h
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#define ELF_MACHINE_NAME "MIPS"
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#define ELF_MACHINE_NO_PLT
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#include <entry.h>
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#ifndef ENTRY_POINT
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#error ENTRY_POINT needs to be defined for MIPS.
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#endif
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#ifndef _RTLD_PROLOGUE
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# define _RTLD_PROLOGUE(entry) "\n\t.globl " #entry \
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"\n\t.ent " #entry \
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"\n\t" #entry ":\n\t"
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#endif
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#ifndef _RTLD_EPILOGUE
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# define _RTLD_EPILOGUE(entry) "\t.end " #entry "\n"
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#endif
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/* A reloc type used for ld.so cmdline arg lookups to reject PLT entries.
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This makes no sense on MIPS but we have to define this to R_MIPS_REL32
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to avoid the asserts in dl-lookup.c from blowing. */
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#define ELF_MACHINE_JMP_SLOT R_MIPS_REL32
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#define elf_machine_lookup_noplt_p(type) (1)
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#define elf_machine_lookup_noexec_p(type) (0)
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/* Translate a processor specific dynamic tag to the index
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in l_info array. */
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#define DT_MIPS(x) (DT_MIPS_##x - DT_LOPROC + DT_NUM)
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#if 0
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/* We may need 64k alignment. */
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#define ELF_MACHINE_ALIGN_MASK 0xffff
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#endif
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/*
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* MIPS libraries are usually linked to a non-zero base address. We
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* subtrace the base address from the address where we map the object
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* to. This results in more efficient address space usage.
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*/
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#if 0
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#define MAP_BASE_ADDR(l) ((l)->l_info[DT_MIPS(BASE_ADDRESS)] ? \
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(l)->l_info[DT_MIPS(BASE_ADDRESS)]->d_un.d_ptr : 0)
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#else
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#define MAP_BASE_ADDR(l) 0x5ffe0000
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#endif
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/* If there is a DT_MIPS_RLD_MAP entry in the dynamic section, fill it in
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with the run-time address of the r_debug structure */
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#define ELF_MACHINE_DEBUG_SETUP(l,r) \
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do { if ((l)->l_info[DT_MIPS (RLD_MAP)]) \
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*(ElfW(Addr) *)((l)->l_info[DT_MIPS (RLD_MAP)]->d_un.d_ptr) = \
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(ElfW(Addr)) (r); \
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} while (0)
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/* Return nonzero iff E_MACHINE is compatible with the running host. */
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static inline int __attribute__ ((unused))
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elf_machine_matches_host (ElfW(Half) e_machine)
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{
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switch (e_machine)
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{
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case EM_MIPS:
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case EM_MIPS_RS3_LE:
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return 1;
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default:
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return 0;
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}
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}
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static inline ElfW(Addr) *
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elf_mips_got_from_gpreg (ElfW(Addr) gpreg)
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{
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/* FIXME: the offset of gp from GOT may be system-dependent. */
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return (ElfW(Addr) *) (gpreg - 0x7ff0);
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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. This must be inlined in a function which
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uses global data. */
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static inline ElfW(Addr)
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elf_machine_dynamic (void)
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{
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register ElfW(Addr) gp __asm__ ("$28");
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return *elf_mips_got_from_gpreg (gp);
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}
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/* Return the run-time load address of the shared object. */
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static inline ElfW(Addr)
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elf_machine_load_address (void)
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{
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ElfW(Addr) addr;
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asm (" .set noreorder\n"
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" dla %0, here\n"
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" bltzal $0, here\n"
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" nop\n"
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"here: dsubu %0, $31, %0\n"
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" .set reorder\n"
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: "=r" (addr)
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: /* No inputs */
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: "$31");
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return addr;
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}
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/* The MSB of got[1] of a gnu object is set to identify gnu objects. */
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#define ELF_MIPS_GNU_GOT1_MASK 0x80000000
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/* Relocate GOT. */
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static inline void
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elf_machine_got_rel (struct link_map *map, int lazy)
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{
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ElfW(Addr) *got;
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ElfW(Sym) *sym;
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int i, n;
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const char *strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]);
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#define RESOLVE_GOTSYM(sym) \
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({ \
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const ElfW(Sym) *ref = sym; \
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ElfW(Addr) sym_loadaddr; \
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sym_loadaddr = _dl_lookup_symbol (strtab + sym->st_name, &ref, \
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map->l_scope, \
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map->l_name, R_MIPS_REL32);\
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(ref)? sym_loadaddr + ref->st_value: 0; \
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})
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got = (ElfW(Addr) *) D_PTR (map, l_info[DT_PLTGOT]);
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/* got[0] is reserved. got[1] is also reserved for the dynamic object
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generated by gnu ld. Skip these reserved entries from relocation. */
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i = (got[1] & ELF_MIPS_GNU_GOT1_MASK)? 2: 1;
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n = map->l_info[DT_MIPS (LOCAL_GOTNO)]->d_un.d_val;
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/* Add the run-time display to all local got entries. */
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while (i < n)
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got[i++] += map->l_addr;
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/* Handle global got entries. */
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got += n;
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sym = (ElfW(Sym) *) D_PTR (map, l_info[DT_SYMTAB]);
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sym += map->l_info[DT_MIPS (GOTSYM)]->d_un.d_val;
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i = (map->l_info[DT_MIPS (SYMTABNO)]->d_un.d_val
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- map->l_info[DT_MIPS (GOTSYM)]->d_un.d_val);
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while (i--)
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{
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if (sym->st_shndx == SHN_UNDEF)
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{
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if (ELFW(ST_TYPE) (sym->st_info) == STT_FUNC)
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{
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if (sym->st_value && lazy)
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*got = sym->st_value + map->l_addr;
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else
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*got = RESOLVE_GOTSYM (sym);
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}
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else /* if (*got == 0 || *got == QS) */
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*got = RESOLVE_GOTSYM (sym);
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}
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else if (sym->st_shndx == SHN_COMMON)
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*got = RESOLVE_GOTSYM (sym);
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else if (ELFW(ST_TYPE) (sym->st_info) == STT_FUNC
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&& *got != sym->st_value
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&& lazy)
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*got += map->l_addr;
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else if (ELFW(ST_TYPE) (sym->st_info) == STT_SECTION)
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{
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if (sym->st_other == 0)
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*got += map->l_addr;
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}
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else
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*got = RESOLVE_GOTSYM (sym);
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got++;
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sym++;
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}
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#undef RESOLVE_GOTSYM
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return;
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}
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/* Set up the loaded object described by L so its stub function
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will jump to the on-demand fixup code in dl-runtime.c. */
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static inline int
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elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
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{
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ElfW(Addr) *got;
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extern void _dl_runtime_resolve (ElfW(Word));
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extern int _dl_mips_gnu_objects;
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#ifdef RTLD_BOOTSTRAP
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{
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return lazy;
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}
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#endif
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if (lazy)
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{
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/* The GOT entries for functions have not yet been filled in.
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Their initial contents will arrange when called to put an
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offset into the .dynsym section in t8, the return address
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in t7 and then jump to _GLOBAL_OFFSET_TABLE[0]. */
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got = (ElfW(Addr) *) D_PTR (l, l_info[DT_PLTGOT]);
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/* This function will get called to fix up the GOT entry indicated by
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the register t8, and then jump to the resolved address. */
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got[0] = (ElfW(Addr)) &_dl_runtime_resolve;
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/* Store l to _GLOBAL_OFFSET_TABLE[1] for gnu object. The MSB
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of got[1] of a gnu object is set to identify gnu objects.
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Where we can store l for non gnu objects? XXX */
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if ((got[1] & ELF_MIPS_GNU_GOT1_MASK) != 0)
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got[1] = (ElfW(Addr)) ((unsigned) l | ELF_MIPS_GNU_GOT1_MASK);
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else
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_dl_mips_gnu_objects = 0;
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}
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/* Relocate global offset table. */
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elf_machine_got_rel (l, lazy);
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return lazy;
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}
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/* Get link_map for this object. */
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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 gnu linker. If all are such object, we can
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find link map from current GPREG simply. If not so, get link map
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for callers 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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return (struct link_map *) (g1 & ~ELF_MIPS_GNU_GOT1_MASK);
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}
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{
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struct link_map *l = _dl_loaded;
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struct link_map *ret = 0;
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ElfW(Addr) candidate = 0;
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while (l)
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{
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ElfW(Addr) base = 0;
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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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/* Get the base. */
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for (this = 0; this < nent; this++)
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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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break;
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}
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if (! base)
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{
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l = l->l_next;
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continue;
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}
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/* Find closest link base addr. */
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if ((base < stub_pc) && (candidate < base))
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{
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candidate = base;
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ret = l;
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}
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l = l->l_next;
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}
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if (candidate && ret && (candidate < stub_pc))
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return ret;
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else if (!candidate)
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return _dl_loaded;
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}
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_dl_signal_error (0, NULL, "cannot find runtime link map");
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return NULL;
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}
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/* Mips has no PLT but define elf_machine_relplt to be elf_machine_rel. */
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#define elf_machine_relplt elf_machine_rel
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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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#define ELF_MACHINE_RUNTIME_TRAMPOLINE \
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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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\
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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__ ((unused)); \
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\
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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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const ElfW(Addr) *got \
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= (const 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) *definer; \
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ElfW(Addr) loadbase; \
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ElfW(Addr) funcaddr; \
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\
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/* Look up the symbol's run-time value. */ \
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definer = &symtab[sym_index]; \
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\
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loadbase = _dl_lookup_symbol (strtab + definer->st_name, &definer, \
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l->l_scope, l->l_name, \
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R_MIPS_REL32); \
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\
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/* Apply the relocation with that value. */ \
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funcaddr = loadbase + definer->st_value; \
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*(got + local_gotno + sym_index - gotsym) = funcaddr; \
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\
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return funcaddr; \
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} \
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\
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asm ("\n \
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.text\n \
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.align 3\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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.set noreorder\n \
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# Save old GP to $3.\n \
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move $3,$28\n \
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# Modify t9 ($25) so as to point .cpload instruction.\n \
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daddu $25,2*8\n \
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# Compute GP.\n \
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.cpload $25\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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# Save arguments and sp value in stack.\n \
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dsubu $29, 10*8\n \
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.cprestore 8*8\n \
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sd $15, 9*8($29)\n \
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sd $4, 3*8($29)\n \
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sd $5, 4*8($29)\n \
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sd $6, 5*8($29)\n \
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sd $7, 6*8($29)\n \
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sd $16, 7*8($29)\n \
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move $16, $29\n \
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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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move $29, $16\n \
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ld $31, 9*8($29)\n \
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ld $4, 3*8($29)\n \
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ld $5, 4*8($29)\n \
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ld $6, 5*8($29)\n \
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ld $7, 6*8($29)\n \
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ld $16, 7*8($29)\n \
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daddu $29, 10*8\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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/* 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 0x80000000UL
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/* Initial entry point code for the dynamic linker.
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The C function `_dl_start' is the real entry point;
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its return value is the user program's entry point.
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Note how we have to be careful about two things:
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1) That we allocate a minimal stack of 24 bytes for
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every function call, the MIPS ABI states that even
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if all arguments are passed in registers the procedure
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called can use the 16 byte area pointed to by $sp
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when it is called to store away the arguments passed
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to it.
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2) That under Linux the entry is named __start
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and not just plain _start. */
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#define RTLD_START asm ("\
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.text\n\
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.align 3\n"\
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_RTLD_PROLOGUE (ENTRY_POINT)\
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" .globl _dl_start_user\n\
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.set noreorder\n\
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bltzal $0, 0f\n\
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nop\n\
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0: .cpload $31\n\
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.set reorder\n\
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# i386 ABI book says that the first entry of GOT holds\n\
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# the address of the dynamic structure. Though MIPS ABI\n\
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# doesn't say nothing about this, I emulate this here.\n\
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dla $4, _DYNAMIC\n\
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sd $4, -0x7ff0($28)\n\
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dsubu $29, 16\n\
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move $4, $29\n\
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jal _dl_start\n\
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daddiu $29, 16\n\
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# Get the value of label '_dl_start_user' in t9 ($25).\n\
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dla $25, _dl_start_user\n\
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_dl_start_user:\n\
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.set noreorder\n\
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.cpload $25\n\
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.set reorder\n\
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move $16, $28\n\
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# Save the user entry point address in saved register.\n\
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move $17, $2\n\
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# Store the highest stack address\n\
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sd $29, __libc_stack_end\n\
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# See if we were run as a command with the executable file\n\
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# name as an extra leading argument.\n\
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ld $2, _dl_skip_args\n\
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beq $2, $0, 1f\n\
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# Load the original argument count.\n\
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ld $4, 0($29)\n\
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# Subtract _dl_skip_args from it.\n\
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dsubu $4, $2\n\
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# Adjust the stack pointer to skip _dl_skip_args words.\n\
|
|
dsll $2,2\n\
|
|
daddu $29, $2\n\
|
|
# Save back the modified argument count.\n\
|
|
sd $4, 0($29)\n\
|
|
1: # Call _dl_init (struct link_map *main_map, int argc, char **argv, char **env) \n\
|
|
ld $4, _dl_loaded\n\
|
|
ld $5, 0($29)\n\
|
|
dla $6, 4($29)\n\
|
|
dla $7, 8($29)\n\
|
|
dsubu $29, 16\n\
|
|
# Call the function to run the initializers.\n\
|
|
jal _dl_init
|
|
daddiu $29, 16\n\
|
|
# Pass our finalizer function to the user in ra.\n\
|
|
dla $31, _dl_fini\n\
|
|
# Jump to the user entry point.\n\
|
|
1: # Call _dl_init (struct link_map *main_map, int argc, char **argv, char **env) \n\
|
|
lw $4, _dl_loaded\n\
|
|
lw $5, 0($29)\n\
|
|
la $6, 4($29)\n\
|
|
la $7, 8($29)\n\
|
|
subu $29, 16\n\
|
|
# Call the function to run the initializers.\n\
|
|
jal _dl_init
|
|
addiu $29, 16\n\
|
|
# Pass our finalizer function to the user in ra.\n\
|
|
dla $31, _dl_fini\n\
|
|
# Jump to the user entry point.\n\
|
|
move $25, $17\n\
|
|
ld $4, 0($29)\n\
|
|
ld $5, 1*8($29)\n\
|
|
ld $6, 2*8$29)\n\
|
|
ld $7, 3*8($29)\n\
|
|
jr $25\n"\
|
|
_RTLD_EPILOGUE(ENTRY_POINT) \
|
|
"\n.previous"\
|
|
);
|
|
|
|
|
|
/* The MIPS never uses Elfxx_Rela relocations. */
|
|
#define ELF_MACHINE_NO_RELA 1
|
|
|
|
#endif /* !dl_machine_h */
|
|
|
|
#ifdef RESOLVE
|
|
|
|
/* Perform the relocation specified by RELOC and SYM (which is fully resolved).
|
|
MAP is the object containing the reloc. */
|
|
|
|
static inline void
|
|
elf_machine_rel (struct link_map *map, const ElfW(Rel) *reloc,
|
|
const ElfW(Sym) *sym, const struct r_found_version *version,
|
|
ElfW(Addr) *const reloc_addr)
|
|
{
|
|
ElfW(Addr) loadbase;
|
|
ElfW(Addr) undo __attribute__ ((unused));
|
|
|
|
switch (ELFW(R_TYPE) (reloc->r_info))
|
|
{
|
|
case R_MIPS_REL32:
|
|
{
|
|
ElfW(Addr) undo = 0;
|
|
|
|
if (ELFW(ST_BIND) (sym->st_info) == STB_LOCAL
|
|
&& (ELFW(ST_TYPE) (sym->st_info) == STT_SECTION
|
|
|| ELFW(ST_TYPE) (sym->st_info) == STT_NOTYPE))
|
|
{
|
|
*reloc_addr += map->l_addr;
|
|
break;
|
|
}
|
|
#ifndef RTLD_BOOTSTRAP
|
|
/* This is defined in rtld.c, but nowhere in the static libc.a;
|
|
make the reference weak so static programs can still link. This
|
|
declaration cannot be done when compiling rtld.c (i.e. #ifdef
|
|
RTLD_BOOTSTRAP) because rtld.c contains the common defn for
|
|
_dl_rtld_map, which is incompatible with a weak decl in the same
|
|
file. */
|
|
weak_extern (_dl_rtld_map);
|
|
if (map == &_dl_rtld_map)
|
|
/* Undo the relocation done here during bootstrapping. Now we will
|
|
relocate it anew, possibly using a binding found in the user
|
|
program or a loaded library rather than the dynamic linker's
|
|
built-in definitions used while loading those libraries. */
|
|
undo = map->l_addr + sym->st_value;
|
|
#endif
|
|
loadbase = RESOLVE (&sym, version, 0);
|
|
*reloc_addr += (sym ? (loadbase + sym->st_value) : 0) - undo;
|
|
}
|
|
break;
|
|
case R_MIPS_NONE: /* Alright, Wilbur. */
|
|
break;
|
|
default:
|
|
_dl_reloc_bad_type (map, ELFW(R_TYPE) (reloc->r_info), 0);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static inline void
|
|
elf_machine_lazy_rel (struct link_map *map, ElfW(Addr) l_addr,
|
|
const ElfW(Rel) *reloc)
|
|
{
|
|
/* Do nothing. */
|
|
}
|
|
|
|
#endif /* RESOLVE */
|