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https://sourceware.org/git/glibc.git
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2000-02-12 Andreas Jaeger <aj@suse.de>
* sysdeps/mips/dl-machine.h (__start): Rewritten for 2.2 startup conventions. (elf_machine_rel): Use R_MIPS_REL32 for RESOLVE. (elf_machine_runtime_setup,elf_machine_got_rel): Move at end of file and make dependend on RESOLVE. (ELF_MACHINE_RUNTIME_TRAMPOLINE): Fix arguments to _dl_lookup_symbol. (RESOLVE_GOTSYM): Fix arguments to _dl_lookup_symbol.
This commit is contained in:
Andreas Jaeger
parent
e1b4ab28ae
commit
bab23124f0
@ -59,8 +59,13 @@
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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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* subtract 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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* FIXME: By the time when MAP_BASE_ADDR is called we don't have the
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* DYNAMIC section read. Until this is fixed make the assumption that
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* libraries have their base address at 0x5ffe0000. This needs to be
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* fixed before we can safely get rid of this MIPSism.
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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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@ -126,125 +131,8 @@ elf_machine_load_address (void)
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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 *) map->l_info[DT_STRTAB]->d_un.d_ptr;
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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) *) map->l_info[DT_PLTGOT]->d_un.d_ptr;
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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 = (void *) map->l_info[DT_SYMTAB]->d_un.d_ptr;
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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) *) l->l_info[DT_PLTGOT]->d_un.d_ptr;
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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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/* 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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@ -352,9 +240,8 @@ __dl_runtime_resolve (ElfW(Word) sym_index, \
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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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loadbase = _dl_lookup_symbol (strtab + definer->st_name, l, &definer, \
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l->l_scope, 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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@ -470,19 +357,33 @@ _dl_start_user:\n\
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addu $29, $2\n\
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# Save back the modified argument count.\n\
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sw $4, 0($29)\n\
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# Get _dl_default_scope[2] as argument in _dl_init_next call below.\n\
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1: la $2, _dl_default_scope\n\
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lw $4, 8($2)\n\
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1: subu $29, 16\n\
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2: # Push the searchlist of the main object as argument in\n\
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# the _dl_preinit_next and _dl_init_next calls below.\n\
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lw $4, _dl_main_searchlist\n\
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# First run the pre-initializers.\n\
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# Call _dl_preinit_next to return the address of an initializer\n\
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# function to run.\n\
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jal _dl_preinit_next
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move $28, $16\n\
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# Check for zero return, when out of initializers.\n\
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beq $2, $0, 4f\n\
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# Call the pre-initializer.\n\
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move $25, $2\n\
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jalr $25\n\
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move $28, $16\n
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# Loop to call _dl_preinit_next for the next initializer.\n\
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b 2b\n
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4: lw $4, _dl_main_searchlist\n\
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# Call _dl_init_next to return the address of an initializer\n\
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# function to run.\n\
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subu $29, 16\n\
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jal _dl_init_next\n\
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addiu $29, 16\n\
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move $28, $16\n\
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# Check for zero return, when out of initializers.\n\
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beq $2, $0, 2f\n\
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# Call the shared object initializer function.\n\
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move $25, $2\n\
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# XXX This looks broken ###.\n\
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lw $4, 0($29)\n\
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lw $5, 4($29)\n\
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lw $6, 8($29)\n\
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@ -490,8 +391,9 @@ _dl_start_user:\n\
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jalr $25\n\
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move $28, $16\n\
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# Loop to call _dl_init_next for the next initializer.\n\
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b 1b\n\
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2: # Clear the startup flag. Assumes 32 bit ints.\n\
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b 4b\n\
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2: addiu $29, 16\n\
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# Clear the startup flag. Assumes 32 bit ints.\n\
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sw $0, _dl_starting_up\n\
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# Pass our finalizer function to the user in ra.\n\
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la $31, _dl_fini\n\
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@ -552,7 +454,7 @@ elf_machine_rel (struct link_map *map, const ElfW(Rel) *reloc,
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built-in definitions used while loading those libraries. */
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undo = map->l_addr + sym->st_value;
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#endif
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loadbase = RESOLVE (&sym, version, 0);
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loadbase = RESOLVE (&sym, version, R_MIPS_REL32);
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*reloc_addr += (sym ? (loadbase + sym->st_value) : 0) - undo;
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}
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break;
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@ -571,4 +473,119 @@ elf_machine_lazy_rel (struct link_map *map,
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/* Do nothing. */
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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 *) map->l_info[DT_STRTAB]->d_un.d_ptr;
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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, map, \
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&ref, map->l_scope, \
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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) *) map->l_info[DT_PLTGOT]->d_un.d_ptr;
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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 = (void *) map->l_info[DT_SYMTAB]->d_un.d_ptr;
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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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# ifndef RTLD_BOOTSTRAP
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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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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) *) l->l_info[DT_PLTGOT]->d_un.d_ptr;
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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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# endif
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return lazy;
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}
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#endif /* RESOLVE */
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