* sysdeps/mips/dl-machine.h: Include sys/asm.h.
(elf_machine_matches_host): Prevent linking of o32 and n32 together. (elf_machine_dynamic): Document assumption on $gp. (STRINGXP, STRINGXV, STRINGV_): New macros. (elf_machine_load_address): Use them to stringize PTR_LA and PTR_SUBU. (ELF_DL_FRAME_SIZE, ELF_DL_SAVE_ARG_REGS, ELF_DL_RESTORE_ARG_REGS, IFABIO32): New macros used in... (_dl_runtime_resolve): Adjust it for all 3 ABIs. (__dl_runtime_resolve): Cast the symtab initializer to the right type. (RTLD_START): Use it. Adjust it for all 3 ABIs. (elf_machine_rel): Mark as always_inline in RTLD_BOOTSTRAP. Handle 64-bit R_MIPS_REL composite relocation and accept R_MIPS_64 relocations to shift addend size to 64 bits. Document assumption regarding local GOT entries. Document backward-compatibility departing from the ABI behavior in applying relocations that reference section symbols, no longer used. Support relocations to mis-aligned offsets. * sysdeps/mips/mips64/dl-machine.h: Deleted, obsolete.
This commit is contained in:
parent
d2e29db722
commit
0d5b725772
|
@ -32,6 +32,8 @@
|
|||
#error ENTRY_POINT needs to be defined for MIPS.
|
||||
#endif
|
||||
|
||||
#include <sys/asm.h>
|
||||
|
||||
/* The offset of gp from GOT might be system-dependent. It's set by
|
||||
ld. The same value is also */
|
||||
#define OFFSET_GP_GOT 0x7ff0
|
||||
|
@ -72,6 +74,13 @@ do { if ((l)->l_info[DT_MIPS (RLD_MAP)]) \
|
|||
static inline int __attribute_used__
|
||||
elf_machine_matches_host (const ElfW(Ehdr) *ehdr)
|
||||
{
|
||||
#if _MIPS_SIM == _MIPS_SIM_ABI32 || _MIPS_SIM == _MIPS_SIM_NABI32
|
||||
/* Don't link o32 and n32 together. */
|
||||
if (((ehdr->e_flags & EF_MIPS_ABI2) != 0)
|
||||
!= (_MIPS_SIM != _MIPS_SIM_ABI32))
|
||||
return 0;
|
||||
#endif
|
||||
|
||||
switch (ehdr->e_machine)
|
||||
{
|
||||
case EM_MIPS:
|
||||
|
@ -91,7 +100,7 @@ elf_mips_got_from_gpreg (ElfW(Addr) gpreg)
|
|||
|
||||
/* Return the link-time address of _DYNAMIC. Conveniently, this is the
|
||||
first element of the GOT. This must be inlined in a function which
|
||||
uses global data. */
|
||||
uses global data. We assume its $gp points to the primary GOT. */
|
||||
static inline ElfW(Addr)
|
||||
elf_machine_dynamic (void)
|
||||
{
|
||||
|
@ -99,6 +108,9 @@ elf_machine_dynamic (void)
|
|||
return *elf_mips_got_from_gpreg (gp);
|
||||
}
|
||||
|
||||
#define STRINGXP(X) __STRING(X)
|
||||
#define STRINGXV(X) STRINGV_(X)
|
||||
#define STRINGV_(...) # __VA_ARGS__
|
||||
|
||||
/* Return the run-time load address of the shared object. */
|
||||
static inline ElfW(Addr)
|
||||
|
@ -106,10 +118,10 @@ elf_machine_load_address (void)
|
|||
{
|
||||
ElfW(Addr) addr;
|
||||
asm (" .set noreorder\n"
|
||||
" la %0, here\n"
|
||||
" bltzal $0, here\n"
|
||||
" " STRINGXP (PTR_LA) " %0, 0f\n"
|
||||
" bltzal $0, 0f\n"
|
||||
" nop\n"
|
||||
"here: subu %0, $31, %0\n"
|
||||
"0: " STRINGXP (PTR_SUBU) " %0, $31, %0\n"
|
||||
" .set reorder\n"
|
||||
: "=r" (addr)
|
||||
: /* No inputs */
|
||||
|
@ -242,6 +254,55 @@ elf_machine_runtime_link_map (ElfW(Addr) gpreg, ElfW(Addr) stub_pc)
|
|||
return NULL;
|
||||
}
|
||||
|
||||
#if _MIPS_SIM == _MIPS_SIM_ABI32
|
||||
#define ELF_DL_FRAME_SIZE 40
|
||||
|
||||
#define ELF_DL_SAVE_ARG_REGS "\
|
||||
sw $15, 36($29)\n \
|
||||
sw $4, 16($29)\n \
|
||||
sw $5, 20($29)\n \
|
||||
sw $6, 24($29)\n \
|
||||
sw $7, 28($29)\n \
|
||||
"
|
||||
|
||||
#define ELF_DL_RESTORE_ARG_REGS "\
|
||||
lw $31, 36($29)\n \
|
||||
lw $4, 16($29)\n \
|
||||
lw $5, 20($29)\n \
|
||||
lw $6, 24($29)\n \
|
||||
lw $7, 28($29)\n \
|
||||
"
|
||||
|
||||
#define IFABIO32(X) X
|
||||
|
||||
#else /* _MIPS_SIM == _MIPS_SIM_NABI32 || _MIPS_SIM == _MIPS_SIM_ABI64 */
|
||||
|
||||
#define ELF_DL_FRAME_SIZE 64
|
||||
|
||||
#define ELF_DL_SAVE_ARG_REGS "\
|
||||
sd $15, 56($29)\n \
|
||||
sd $4, 8($29)\n \
|
||||
sd $5, 16($29)\n \
|
||||
sd $6, 24($29)\n \
|
||||
sd $7, 32($29)\n \
|
||||
sd $8, 40($29)\n \
|
||||
sd $9, 48($29)\n \
|
||||
"
|
||||
|
||||
#define ELF_DL_RESTORE_ARG_REGS "\
|
||||
ld $31, 56($29)\n \
|
||||
ld $4, 8($29)\n \
|
||||
ld $5, 16($29)\n \
|
||||
ld $6, 24($29)\n \
|
||||
ld $7, 32($29)\n \
|
||||
ld $8, 40($29)\n \
|
||||
ld $9, 48($29)\n \
|
||||
"
|
||||
|
||||
#define IFABIO32(X)
|
||||
|
||||
#endif
|
||||
|
||||
/* Define mips specific runtime resolver. The function __dl_runtime_resolve
|
||||
is called from assembler function _dl_runtime_resolve which converts
|
||||
special argument registers t7 ($15) and t8 ($24):
|
||||
|
@ -272,9 +333,8 @@ __dl_runtime_resolve (ElfW(Word) sym_index, \
|
|||
{ \
|
||||
struct link_map *l = elf_machine_runtime_link_map (old_gpreg, stub_pc); \
|
||||
const ElfW(Sym) *const symtab \
|
||||
= (const void *) D_PTR (l, l_info[DT_SYMTAB]); \
|
||||
const char *strtab \
|
||||
= (const void *) D_PTR (l, l_info[DT_STRTAB]); \
|
||||
= (const ElfW(Sym) *) D_PTR (l, l_info[DT_SYMTAB]); \
|
||||
const char *strtab = (const void *) D_PTR (l, l_info[DT_STRTAB]); \
|
||||
ElfW(Addr) *got \
|
||||
= (ElfW(Addr) *) D_PTR (l, l_info[DT_PLTGOT]); \
|
||||
const ElfW(Word) local_gotno \
|
||||
|
@ -333,36 +393,30 @@ asm ("\n \
|
|||
.type _dl_runtime_resolve,@function\n \
|
||||
.ent _dl_runtime_resolve\n \
|
||||
_dl_runtime_resolve:\n \
|
||||
.frame $29, 40, $31\n \
|
||||
.frame $29, " STRINGXP(ELF_DL_FRAME_SIZE) ", $31\n \
|
||||
.set noreorder\n \
|
||||
# Save GP.\n \
|
||||
move $3, $28\n \
|
||||
# Save arguments and sp value in stack.\n \
|
||||
" STRINGXP(PTR_SUBIU) " $29, " STRINGXP(ELF_DL_FRAME_SIZE) "\n \
|
||||
# Modify t9 ($25) so as to point .cpload instruction.\n \
|
||||
addu $25, 8\n \
|
||||
" IFABIO32(STRINGXP(PTR_ADDIU) " $25, 12\n") " \
|
||||
# Compute GP.\n \
|
||||
.cpload $25\n \
|
||||
" STRINGXP(SETUP_GP) "\n \
|
||||
" STRINGXV(SETUP_GP64 (0, _dl_runtime_resolve)) "\n \
|
||||
.set reorder\n \
|
||||
# Save slot call pc.\n \
|
||||
move $2, $31\n \
|
||||
# Save arguments and sp value in stack.\n \
|
||||
subu $29, 40\n \
|
||||
.cprestore 32\n \
|
||||
sw $15, 36($29)\n \
|
||||
sw $4, 16($29)\n \
|
||||
sw $5, 20($29)\n \
|
||||
sw $6, 24($29)\n \
|
||||
sw $7, 28($29)\n \
|
||||
" IFABIO32(STRINGXP(CPRESTORE(32))) "\n \
|
||||
" ELF_DL_SAVE_ARG_REGS " \
|
||||
move $4, $24\n \
|
||||
move $5, $15\n \
|
||||
move $6, $3\n \
|
||||
move $7, $2\n \
|
||||
jal __dl_runtime_resolve\n \
|
||||
lw $31, 36($29)\n \
|
||||
lw $4, 16($29)\n \
|
||||
lw $5, 20($29)\n \
|
||||
lw $6, 24($29)\n \
|
||||
lw $7, 28($29)\n \
|
||||
addu $29, 40\n \
|
||||
" ELF_DL_RESTORE_ARG_REGS " \
|
||||
" STRINGXP(RESTORE_GP64) "\n \
|
||||
" STRINGXP(PTR_ADDIU) " $29, " STRINGXP(ELF_DL_FRAME_SIZE) "\n \
|
||||
move $25, $2\n \
|
||||
jr $25\n \
|
||||
.end _dl_runtime_resolve\n \
|
||||
|
@ -374,7 +428,6 @@ _dl_runtime_resolve:\n \
|
|||
#define ELF_MACHINE_USER_ADDRESS_MASK 0x80000000UL
|
||||
|
||||
|
||||
|
||||
/* Initial entry point code for the dynamic linker.
|
||||
The C function `_dl_start' is the real entry point;
|
||||
its return value is the user program's entry point.
|
||||
|
@ -392,71 +445,71 @@ _dl_runtime_resolve:\n \
|
|||
|
||||
#define RTLD_START asm (\
|
||||
".text\n"\
|
||||
_RTLD_PROLOGUE(ENTRY_POINT)\
|
||||
".set noreorder\n\
|
||||
bltzal $0, 0f\n\
|
||||
nop\n\
|
||||
0: .cpload $31\n\
|
||||
.set reorder\n\
|
||||
_RTLD_PROLOGUE(ENTRY_POINT) "\
|
||||
" STRINGXV(SETUP_GPX($25)) "\n\
|
||||
" STRINGXV(SETUP_GPX64($18,$25)) "\n\
|
||||
# i386 ABI book says that the first entry of GOT holds\n\
|
||||
# the address of the dynamic structure. Though MIPS ABI\n\
|
||||
# doesn't say nothing about this, I emulate this here.\n\
|
||||
la $4, _DYNAMIC\n\
|
||||
" STRINGXP(PTR_LA) " $4, _DYNAMIC\n\
|
||||
# Subtract OFFSET_GP_GOT\n\
|
||||
sw $4, -0x7ff0($28)\n\
|
||||
" STRINGXP(PTR_S) " $4, -0x7ff0($28)\n\
|
||||
move $4, $29\n\
|
||||
subu $29, 16\n\
|
||||
" STRINGXP(PTR_SUBIU) " $29, 16\n\
|
||||
\n\
|
||||
la $8, coff\n\
|
||||
bltzal $8, coff\n\
|
||||
coff: subu $8, $31, $8\n\
|
||||
" STRINGXP(PTR_LA) " $8, .Lcoff\n\
|
||||
bltzal $8, .Lcoff\n\
|
||||
.Lcoff: " STRINGXP(PTR_SUBU) " $8, $31, $8\n\
|
||||
\n\
|
||||
la $25, _dl_start\n\
|
||||
addu $25, $8\n\
|
||||
" STRINGXP(PTR_LA) " $25, _dl_start\n\
|
||||
" STRINGXP(PTR_ADDU) " $25, $8\n\
|
||||
jalr $25\n\
|
||||
\n\
|
||||
addiu $29, 16\n\
|
||||
" STRINGXP(PTR_ADDIU) " $29, 16\n\
|
||||
# Get the value of label '_dl_start_user' in t9 ($25).\n\
|
||||
la $25, _dl_start_user\n\
|
||||
" STRINGXP(PTR_LA) " $25, _dl_start_user\n\
|
||||
.globl _dl_start_user\n\
|
||||
.type _dl_start_user,@function\n\
|
||||
.ent _dl_start_user\n\
|
||||
_dl_start_user:\n\
|
||||
.set noreorder\n\
|
||||
.cpload $25\n\
|
||||
.set reorder\n\
|
||||
" STRINGXP(SETUP_GP) "\n\
|
||||
" STRINGXV(SETUP_GP64($18,_dl_start_user)) "\n\
|
||||
move $16, $28\n\
|
||||
# Save the user entry point address in a saved register.\n\
|
||||
move $17, $2\n\
|
||||
# Store the highest stack address\n\
|
||||
sw $29, __libc_stack_end\n\
|
||||
" STRINGXP(PTR_S) " $29, __libc_stack_end\n\
|
||||
# See if we were run as a command with the executable file\n\
|
||||
# name as an extra leading argument.\n\
|
||||
lw $2, _dl_skip_args\n\
|
||||
beq $2, $0, 1f\n\
|
||||
# Load the original argument count.\n\
|
||||
lw $4, 0($29)\n\
|
||||
" STRINGXP(PTR_L) " $4, 0($29)\n\
|
||||
# Subtract _dl_skip_args from it.\n\
|
||||
subu $4, $2\n\
|
||||
# Adjust the stack pointer to skip _dl_skip_args words.\n\
|
||||
sll $2, 2\n\
|
||||
addu $29, $2\n\
|
||||
sll $2, " STRINGXP (PTRLOG) "\n\
|
||||
" STRINGXP(PTR_ADDU) " $29, $2\n\
|
||||
# Save back the modified argument count.\n\
|
||||
sw $4, 0($29)\n\
|
||||
" STRINGXP(PTR_S) " $4, 0($29)\n\
|
||||
1: # Call _dl_init (struct link_map *main_map, int argc, char **argv, char **env) \n\
|
||||
lw $4, _rtld_local\n\
|
||||
lw $5, 0($29)\n\
|
||||
la $6, 4($29)\n\
|
||||
sll $7, $5, 2\n\
|
||||
addu $7, $7, $6\n\
|
||||
addu $7, $7, 4\n\
|
||||
subu $29, 16\n\
|
||||
" STRINGXP(PTR_L) " $4, _rtld_local\n\
|
||||
" STRINGXP(PTR_L) /* or lw??? fixme */ " $5, 0($29)\n\
|
||||
" STRINGXP(PTR_LA) " $6, " STRINGXP (PTRSIZE) "($29)\n\
|
||||
sll $7, $5, " STRINGXP (PTRLOG) "\n\
|
||||
" STRINGXP(PTR_ADDU) " $7, $7, $6\n\
|
||||
" STRINGXP(PTR_ADDU) " $7, $7, " STRINGXP (PTRSIZE) " \n\
|
||||
" STRINGXP(PTR_SUBIU) " $29, 32\n\
|
||||
" STRINGXP(SAVE_GP(16)) "\n\
|
||||
# Call the function to run the initializers.\n\
|
||||
jal _dl_init_internal\n\
|
||||
addiu $29, 16\n\
|
||||
" STRINGXP(PTR_ADDIU) " $29, 32\n\
|
||||
# Pass our finalizer function to the user in $2 as per ELF ABI.\n\
|
||||
la $2, _dl_fini\n\
|
||||
" STRINGXP(PTR_LA) " $2, _dl_fini\n\
|
||||
# Jump to the user entry point.\n\
|
||||
move $25, $17\n\
|
||||
jr $25\n\t"\
|
||||
jr $25\n\
|
||||
.end _dl_start_user\n\t"\
|
||||
_RTLD_EPILOGUE(ENTRY_POINT)\
|
||||
".previous"\
|
||||
);
|
||||
|
@ -472,6 +525,9 @@ _dl_start_user:\n\
|
|||
MAP is the object containing the reloc. */
|
||||
|
||||
static inline void
|
||||
#ifdef RTLD_BOOTSTRAP
|
||||
__attribute__ ((always_inline))
|
||||
#endif
|
||||
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)
|
||||
|
@ -490,9 +546,19 @@ elf_machine_rel (struct link_map *map, const ElfW(Rel) *reloc,
|
|||
|
||||
switch (r_type)
|
||||
{
|
||||
#if _MIPS_SIM == _MIPS_SIM_ABI64
|
||||
case (R_MIPS_64 << 8) | R_MIPS_REL32:
|
||||
#else
|
||||
case R_MIPS_REL32:
|
||||
#endif
|
||||
{
|
||||
int symidx = ELFW(R_SYM) (reloc->r_info);
|
||||
ElfW(Addr) reloc_value;
|
||||
|
||||
/* Support relocations on mis-aligned offsets. Should we ever
|
||||
implement RELA, this should be replaced with an assignment
|
||||
from reloc->r_addend. */
|
||||
__builtin_memcpy (&reloc_value, reloc_addr, sizeof (reloc_value));
|
||||
|
||||
if (symidx)
|
||||
{
|
||||
|
@ -501,10 +567,25 @@ elf_machine_rel (struct link_map *map, const ElfW(Rel) *reloc,
|
|||
|
||||
if (symidx < gotsym)
|
||||
{
|
||||
/* This wouldn't work for a symbol imported from other
|
||||
libraries for which there's no GOT entry, but MIPS
|
||||
requires every symbol referenced in a dynamic
|
||||
relocation to have a GOT entry in the primary GOT,
|
||||
so we only get here for locally-defined symbols.
|
||||
For section symbols, we should *NOT* be adding
|
||||
sym->st_value (per the definition of the meaning of
|
||||
S in reloc expressions in the ELF64 MIPS ABI),
|
||||
since it should have already been added to
|
||||
reloc_value by the linker, but older versions of
|
||||
GNU ld didn't add it, and newer versions don't emit
|
||||
useless relocations to section symbols any more, so
|
||||
it is safe to keep on adding sym->st_value, even
|
||||
though it's not ABI compliant. Some day we should
|
||||
bite the bullet and stop doing this. */
|
||||
#ifndef RTLD_BOOTSTRAP
|
||||
if (map != &GL(dl_rtld_map))
|
||||
#endif
|
||||
*reloc_addr += sym->st_value + map->l_addr;
|
||||
reloc_value += sym->st_value + map->l_addr;
|
||||
}
|
||||
else
|
||||
{
|
||||
|
@ -515,7 +596,7 @@ elf_machine_rel (struct link_map *map, const ElfW(Rel) *reloc,
|
|||
= (const ElfW(Word))
|
||||
map->l_info[DT_MIPS (LOCAL_GOTNO)]->d_un.d_val;
|
||||
|
||||
*reloc_addr += got[symidx + local_gotno - gotsym];
|
||||
reloc_value += got[symidx + local_gotno - gotsym];
|
||||
#endif
|
||||
}
|
||||
}
|
||||
|
@ -523,11 +604,27 @@ elf_machine_rel (struct link_map *map, const ElfW(Rel) *reloc,
|
|||
#ifndef RTLD_BOOTSTRAP
|
||||
if (map != &GL(dl_rtld_map))
|
||||
#endif
|
||||
*reloc_addr += map->l_addr;
|
||||
reloc_value += map->l_addr;
|
||||
|
||||
__builtin_memcpy (reloc_addr, &reloc_value, sizeof (reloc_value));
|
||||
}
|
||||
break;
|
||||
case R_MIPS_NONE: /* Alright, Wilbur. */
|
||||
break;
|
||||
#if _MIPS_SIM == _MIPS_SIM_ABI64
|
||||
case R_MIPS_64:
|
||||
/* For full compliance with the ELF64 ABI, one must precede the
|
||||
_REL32/_64 pair of relocations with a _64 relocation, such
|
||||
that the in-place addend is read as a 64-bit value. IRIX
|
||||
didn't pick up on this requirement, so we treat the
|
||||
_REL32/_64 relocation as a 64-bit relocation even if it's by
|
||||
itself. For ABI compliance, we ignore such _64 dummy
|
||||
relocations. For RELA, this may be simply removed, since
|
||||
it's totally unnecessary. */
|
||||
if (ELFW(R_SYM) (reloc->r_info) == 0)
|
||||
break;
|
||||
/* Fall through. */
|
||||
#endif
|
||||
default:
|
||||
_dl_reloc_bad_type (map, r_type, 0);
|
||||
break;
|
||||
|
|
|
@ -1,594 +0,0 @@
|
|||
/* Machine-dependent ELF dynamic relocation inline functions. MIPS64 version.
|
||||
Copyright (C) 1996,1997,1999,2000,2001,2002 Free Software Foundation, Inc.
|
||||
This file is part of the GNU C Library.
|
||||
Contributed by Kazumoto Kojima <kkojima@info.kanagawa-u.ac.jp>.
|
||||
|
||||
The GNU C Library is free software; you can redistribute it and/or
|
||||
modify it under the terms of the GNU Lesser General Public
|
||||
License as published by the Free Software Foundation; either
|
||||
version 2.1 of the License, or (at your option) any later version.
|
||||
|
||||
The GNU C Library is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
Lesser General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Lesser General Public
|
||||
License along with the GNU C Library; if not, write to the Free
|
||||
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
||||
02111-1307 USA. */
|
||||
|
||||
#ifndef dl_machine_h
|
||||
#define dl_machine_h
|
||||
|
||||
#define ELF_MACHINE_NAME "MIPS"
|
||||
|
||||
#define ELF_MACHINE_NO_PLT
|
||||
|
||||
#include <entry.h>
|
||||
|
||||
#ifndef ENTRY_POINT
|
||||
#error ENTRY_POINT needs to be defined for MIPS.
|
||||
#endif
|
||||
|
||||
#ifndef _RTLD_PROLOGUE
|
||||
# define _RTLD_PROLOGUE(entry) "\n\t.globl " __STRING(entry) \
|
||||
"\n\t.ent " __STRING(entry) \
|
||||
"\n\t" __STRING(entry) ":\n\t"
|
||||
#endif
|
||||
|
||||
#ifndef _RTLD_EPILOGUE
|
||||
# define _RTLD_EPILOGUE(entry) "\t.end " __STRING(entry) "\n"
|
||||
#endif
|
||||
|
||||
/* A reloc type used for ld.so cmdline arg lookups to reject PLT entries.
|
||||
This makes no sense on MIPS but we have to define this to R_MIPS_REL32
|
||||
to avoid the asserts in dl-lookup.c from blowing. */
|
||||
#define ELF_MACHINE_JMP_SLOT R_MIPS_REL32
|
||||
#define elf_machine_type_class(type) ELF_RTYPE_CLASS_PLT
|
||||
|
||||
/* Translate a processor specific dynamic tag to the index
|
||||
in l_info array. */
|
||||
#define DT_MIPS(x) (DT_MIPS_##x - DT_LOPROC + DT_NUM)
|
||||
|
||||
#if 0
|
||||
/* We may need 64k alignment. */
|
||||
#define ELF_MACHINE_ALIGN_MASK 0xffff
|
||||
#endif
|
||||
|
||||
/*
|
||||
* MIPS libraries are usually linked to a non-zero base address. We
|
||||
* subtrace the base address from the address where we map the object
|
||||
* to. This results in more efficient address space usage.
|
||||
*/
|
||||
#if 0
|
||||
#define MAP_BASE_ADDR(l) ((l)->l_info[DT_MIPS(BASE_ADDRESS)] ? \
|
||||
(l)->l_info[DT_MIPS(BASE_ADDRESS)]->d_un.d_ptr : 0)
|
||||
#else
|
||||
#define MAP_BASE_ADDR(l) 0x5ffe0000
|
||||
#endif
|
||||
|
||||
/* If there is a DT_MIPS_RLD_MAP entry in the dynamic section, fill it in
|
||||
with the run-time address of the r_debug structure */
|
||||
#define ELF_MACHINE_DEBUG_SETUP(l,r) \
|
||||
do { if ((l)->l_info[DT_MIPS (RLD_MAP)]) \
|
||||
*(ElfW(Addr) *)((l)->l_info[DT_MIPS (RLD_MAP)]->d_un.d_ptr) = \
|
||||
(ElfW(Addr)) (r); \
|
||||
} while (0)
|
||||
|
||||
/* Return nonzero iff ELF header is compatible with the running host. */
|
||||
static inline int __attribute__ ((unused))
|
||||
elf_machine_matches_host (const ElfW(Ehdr) *ehdr)
|
||||
{
|
||||
switch (ehdr->e_machine)
|
||||
{
|
||||
case EM_MIPS:
|
||||
case EM_MIPS_RS3_LE:
|
||||
return 1;
|
||||
default:
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
static inline ElfW(Addr) *
|
||||
elf_mips_got_from_gpreg (ElfW(Addr) gpreg)
|
||||
{
|
||||
/* FIXME: the offset of gp from GOT may be system-dependent. */
|
||||
return (ElfW(Addr) *) (gpreg - 0x7ff0);
|
||||
}
|
||||
|
||||
/* Return the link-time address of _DYNAMIC. Conveniently, this is the
|
||||
first element of the GOT. This must be inlined in a function which
|
||||
uses global data. */
|
||||
static inline ElfW(Addr)
|
||||
elf_machine_dynamic (void)
|
||||
{
|
||||
register ElfW(Addr) gp __asm__ ("$28");
|
||||
|
||||
return *elf_mips_got_from_gpreg (gp);
|
||||
}
|
||||
|
||||
|
||||
/* Return the run-time load address of the shared object. */
|
||||
static inline ElfW(Addr)
|
||||
elf_machine_load_address (void)
|
||||
{
|
||||
ElfW(Addr) addr;
|
||||
asm (" .set noreorder\n"
|
||||
" dla %0, here\n"
|
||||
" bltzal $0, here\n"
|
||||
" nop\n"
|
||||
"here: dsubu %0, $31, %0\n"
|
||||
" .set reorder\n"
|
||||
: "=r" (addr)
|
||||
: /* No inputs */
|
||||
: "$31");
|
||||
return addr;
|
||||
}
|
||||
|
||||
/* The MSB of got[1] of a gnu object is set to identify gnu objects. */
|
||||
#define ELF_MIPS_GNU_GOT1_MASK 0x80000000
|
||||
|
||||
/* Relocate GOT. */
|
||||
static inline void
|
||||
elf_machine_got_rel (struct link_map *map, int lazy)
|
||||
{
|
||||
ElfW(Addr) *got;
|
||||
ElfW(Sym) *sym;
|
||||
int i, n;
|
||||
const char *strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]);
|
||||
|
||||
#define RESOLVE_GOTSYM(sym) \
|
||||
({ \
|
||||
const ElfW(Sym) *ref = sym; \
|
||||
ElfW(Addr) sym_loadaddr; \
|
||||
sym_loadaddr = _dl_lookup_symbol (strtab + sym->st_name, &ref, \
|
||||
map->l_scope, \
|
||||
map->l_name, R_MIPS_REL32);\
|
||||
(ref)? sym_loadaddr + ref->st_value: 0; \
|
||||
})
|
||||
|
||||
got = (ElfW(Addr) *) D_PTR (map, l_info[DT_PLTGOT]);
|
||||
|
||||
/* got[0] is reserved. got[1] is also reserved for the dynamic object
|
||||
generated by gnu ld. Skip these reserved entries from relocation. */
|
||||
i = (got[1] & ELF_MIPS_GNU_GOT1_MASK)? 2: 1;
|
||||
n = map->l_info[DT_MIPS (LOCAL_GOTNO)]->d_un.d_val;
|
||||
/* Add the run-time display to all local got entries. */
|
||||
while (i < n)
|
||||
got[i++] += map->l_addr;
|
||||
|
||||
/* Handle global got entries. */
|
||||
got += n;
|
||||
sym = (ElfW(Sym) *) D_PTR (map, l_info[DT_SYMTAB]);
|
||||
sym += map->l_info[DT_MIPS (GOTSYM)]->d_un.d_val;
|
||||
i = (map->l_info[DT_MIPS (SYMTABNO)]->d_un.d_val
|
||||
- map->l_info[DT_MIPS (GOTSYM)]->d_un.d_val);
|
||||
|
||||
while (i--)
|
||||
{
|
||||
if (sym->st_shndx == SHN_UNDEF)
|
||||
{
|
||||
if (ELFW(ST_TYPE) (sym->st_info) == STT_FUNC)
|
||||
{
|
||||
if (sym->st_value && lazy)
|
||||
*got = sym->st_value + map->l_addr;
|
||||
else
|
||||
*got = RESOLVE_GOTSYM (sym);
|
||||
}
|
||||
else /* if (*got == 0 || *got == QS) */
|
||||
*got = RESOLVE_GOTSYM (sym);
|
||||
}
|
||||
else if (sym->st_shndx == SHN_COMMON)
|
||||
*got = RESOLVE_GOTSYM (sym);
|
||||
else if (ELFW(ST_TYPE) (sym->st_info) == STT_FUNC
|
||||
&& *got != sym->st_value
|
||||
&& lazy)
|
||||
*got += map->l_addr;
|
||||
else if (ELFW(ST_TYPE) (sym->st_info) == STT_SECTION)
|
||||
{
|
||||
if (sym->st_other == 0)
|
||||
*got += map->l_addr;
|
||||
}
|
||||
else
|
||||
*got = RESOLVE_GOTSYM (sym);
|
||||
|
||||
got++;
|
||||
sym++;
|
||||
}
|
||||
|
||||
#undef RESOLVE_GOTSYM
|
||||
|
||||
return;
|
||||
}
|
||||
|
||||
/* Set up the loaded object described by L so its stub function
|
||||
will jump to the on-demand fixup code in dl-runtime.c. */
|
||||
|
||||
static inline int
|
||||
elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
|
||||
{
|
||||
ElfW(Addr) *got;
|
||||
extern void _dl_runtime_resolve (ElfW(Word));
|
||||
extern int _dl_mips_gnu_objects;
|
||||
|
||||
#ifdef RTLD_BOOTSTRAP
|
||||
{
|
||||
return lazy;
|
||||
}
|
||||
#endif
|
||||
if (lazy)
|
||||
{
|
||||
/* The GOT entries for functions have not yet been filled in.
|
||||
Their initial contents will arrange when called to put an
|
||||
offset into the .dynsym section in t8, the return address
|
||||
in t7 and then jump to _GLOBAL_OFFSET_TABLE[0]. */
|
||||
got = (ElfW(Addr) *) D_PTR (l, l_info[DT_PLTGOT]);
|
||||
|
||||
/* This function will get called to fix up the GOT entry indicated by
|
||||
the register t8, and then jump to the resolved address. */
|
||||
got[0] = (ElfW(Addr)) &_dl_runtime_resolve;
|
||||
|
||||
/* Store l to _GLOBAL_OFFSET_TABLE[1] for gnu object. The MSB
|
||||
of got[1] of a gnu object is set to identify gnu objects.
|
||||
Where we can store l for non gnu objects? XXX */
|
||||
if ((got[1] & ELF_MIPS_GNU_GOT1_MASK) != 0)
|
||||
got[1] = (ElfW(Addr)) ((unsigned) l | ELF_MIPS_GNU_GOT1_MASK);
|
||||
else
|
||||
_dl_mips_gnu_objects = 0;
|
||||
}
|
||||
|
||||
/* Relocate global offset table. */
|
||||
elf_machine_got_rel (l, lazy);
|
||||
|
||||
return lazy;
|
||||
}
|
||||
|
||||
/* Get link_map for this object. */
|
||||
static inline struct link_map *
|
||||
elf_machine_runtime_link_map (ElfW(Addr) gpreg, ElfW(Addr) stub_pc)
|
||||
{
|
||||
extern int _dl_mips_gnu_objects;
|
||||
|
||||
/* got[1] is reserved to keep its link map address for the shared
|
||||
object generated by the gnu linker. If all are such objects, we
|
||||
can find the link map from current GPREG simply. If not so, get
|
||||
the link map for caller's object containing STUB_PC. */
|
||||
|
||||
if (_dl_mips_gnu_objects)
|
||||
{
|
||||
ElfW(Addr) *got = elf_mips_got_from_gpreg (gpreg);
|
||||
ElfW(Word) g1;
|
||||
|
||||
g1 = ((ElfW(Word) *) got)[1];
|
||||
|
||||
if ((g1 & ELF_MIPS_GNU_GOT1_MASK) != 0)
|
||||
{
|
||||
struct link_map *l =
|
||||
(struct link_map *) (g1 & ~ELF_MIPS_GNU_GOT1_MASK);
|
||||
ElfW(Addr) base, limit;
|
||||
const ElfW(Phdr) *p = l->l_phdr;
|
||||
ElfW(Half) this, nent = l->l_phnum;
|
||||
|
||||
/* For the common case of a stub being called from the containing
|
||||
object, STUB_PC will point to somewhere within the object that
|
||||
is described by the link map fetched via got[1]. Otherwise we
|
||||
have to scan all maps. */
|
||||
for (this = 0; this < nent; this++)
|
||||
{
|
||||
if (p[this].p_type == PT_LOAD)
|
||||
{
|
||||
base = p[this].p_vaddr + l->l_addr;
|
||||
limit = base + p[this].p_memsz;
|
||||
if (stub_pc >= base && stub_pc < limit)
|
||||
return l;
|
||||
}
|
||||
this++;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
{
|
||||
struct link_map *l = GL(dl_loaded);
|
||||
|
||||
while (l)
|
||||
{
|
||||
ElfW(Addr) base, limit;
|
||||
const ElfW(Phdr) *p = l->l_phdr;
|
||||
ElfW(Half) this, nent = l->l_phnum;
|
||||
|
||||
for (this = 0; this < nent; this++)
|
||||
{
|
||||
if (p[this].p_type == PT_LOAD)
|
||||
{
|
||||
base = p[this].p_vaddr + l->l_addr;
|
||||
limit = base + p[this].p_memsz;
|
||||
if (stub_pc >= base && stub_pc < limit)
|
||||
return l;
|
||||
}
|
||||
}
|
||||
l = l->l_next;
|
||||
}
|
||||
}
|
||||
|
||||
_dl_signal_error (0, NULL, NULL, "cannot find runtime link map");
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* Mips has no PLT but define elf_machine_relplt to be elf_machine_rel. */
|
||||
#define elf_machine_relplt elf_machine_rel
|
||||
|
||||
/* Define mips specific runtime resolver. The function __dl_runtime_resolve
|
||||
is called from assembler function _dl_runtime_resolve which converts
|
||||
special argument registers t7 ($15) and t8 ($24):
|
||||
t7 address to return to the caller of the function
|
||||
t8 index for this function symbol in .dynsym
|
||||
to usual c arguments. */
|
||||
|
||||
#define ELF_MACHINE_RUNTIME_TRAMPOLINE \
|
||||
/* The flag _dl_mips_gnu_objects is set if all dynamic objects are \
|
||||
generated by the gnu linker. */ \
|
||||
int _dl_mips_gnu_objects = 1; \
|
||||
\
|
||||
/* This is called from assembly stubs below which the compiler can't see. */ \
|
||||
static ElfW(Addr) \
|
||||
__dl_runtime_resolve (ElfW(Word), ElfW(Word), ElfW(Addr), ElfW(Addr)) \
|
||||
__attribute__ ((unused)); \
|
||||
\
|
||||
static ElfW(Addr) \
|
||||
__dl_runtime_resolve (ElfW(Word) sym_index, \
|
||||
ElfW(Word) return_address, \
|
||||
ElfW(Addr) old_gpreg, \
|
||||
ElfW(Addr) stub_pc) \
|
||||
{ \
|
||||
struct link_map *l = elf_machine_runtime_link_map (old_gpreg, stub_pc); \
|
||||
const ElfW(Sym) *const symtab \
|
||||
= (const ElfW(Sym) *) D_PTR (l, l_info[DT_SYMTAB]); \
|
||||
const char *strtab = (const void *) D_PTR (l, l_info[DT_STRTAB]); \
|
||||
const ElfW(Addr) *got \
|
||||
= (const ElfW(Addr) *) D_PTR (l, l_info[DT_PLTGOT]); \
|
||||
const ElfW(Word) local_gotno \
|
||||
= (const ElfW(Word)) l->l_info[DT_MIPS (LOCAL_GOTNO)]->d_un.d_val; \
|
||||
const ElfW(Word) gotsym \
|
||||
= (const ElfW(Word)) l->l_info[DT_MIPS (GOTSYM)]->d_un.d_val; \
|
||||
const ElfW(Sym) *definer; \
|
||||
ElfW(Addr) loadbase; \
|
||||
ElfW(Addr) funcaddr; \
|
||||
\
|
||||
/* Look up the symbol's run-time value. */ \
|
||||
definer = &symtab[sym_index]; \
|
||||
\
|
||||
loadbase = _dl_lookup_symbol (strtab + definer->st_name, &definer, \
|
||||
l->l_scope, l->l_name, \
|
||||
R_MIPS_REL32); \
|
||||
\
|
||||
/* Apply the relocation with that value. */ \
|
||||
funcaddr = loadbase + definer->st_value; \
|
||||
*(got + local_gotno + sym_index - gotsym) = funcaddr; \
|
||||
\
|
||||
return funcaddr; \
|
||||
} \
|
||||
\
|
||||
asm ("\n \
|
||||
.text\n \
|
||||
.align 3\n \
|
||||
.globl _dl_runtime_resolve\n \
|
||||
.type _dl_runtime_resolve,@function\n \
|
||||
.ent _dl_runtime_resolve\n \
|
||||
_dl_runtime_resolve:\n \
|
||||
.set noreorder\n \
|
||||
# Save old GP to $3.\n \
|
||||
move $3,$28\n \
|
||||
# Modify t9 ($25) so as to point .cpload instruction.\n \
|
||||
daddu $25,2*8\n \
|
||||
# Compute GP.\n \
|
||||
.cpload $25\n \
|
||||
.set reorder\n \
|
||||
# Save slot call pc.\n \
|
||||
move $2, $31\n \
|
||||
# Save arguments and sp value in stack.\n \
|
||||
dsubu $29, 10*8\n \
|
||||
.cprestore 8*8\n \
|
||||
sd $15, 9*8($29)\n \
|
||||
sd $4, 3*8($29)\n \
|
||||
sd $5, 4*8($29)\n \
|
||||
sd $6, 5*8($29)\n \
|
||||
sd $7, 6*8($29)\n \
|
||||
sd $16, 7*8($29)\n \
|
||||
move $16, $29\n \
|
||||
move $4, $24\n \
|
||||
move $5, $15\n \
|
||||
move $6, $3\n \
|
||||
move $7, $2\n \
|
||||
jal __dl_runtime_resolve\n \
|
||||
move $29, $16\n \
|
||||
ld $31, 9*8($29)\n \
|
||||
ld $4, 3*8($29)\n \
|
||||
ld $5, 4*8($29)\n \
|
||||
ld $6, 5*8($29)\n \
|
||||
ld $7, 6*8($29)\n \
|
||||
ld $16, 7*8($29)\n \
|
||||
daddu $29, 10*8\n \
|
||||
move $25, $2\n \
|
||||
jr $25\n \
|
||||
.end _dl_runtime_resolve\n \
|
||||
.previous\n \
|
||||
");
|
||||
|
||||
/* Mask identifying addresses reserved for the user program,
|
||||
where the dynamic linker should not map anything. */
|
||||
#define ELF_MACHINE_USER_ADDRESS_MASK 0x80000000UL
|
||||
|
||||
|
||||
|
||||
/* Initial entry point code for the dynamic linker.
|
||||
The C function `_dl_start' is the real entry point;
|
||||
its return value is the user program's entry point.
|
||||
Note how we have to be careful about two things:
|
||||
|
||||
1) That we allocate a minimal stack of 24 bytes for
|
||||
every function call, the MIPS ABI states that even
|
||||
if all arguments are passed in registers the procedure
|
||||
called can use the 16 byte area pointed to by $sp
|
||||
when it is called to store away the arguments passed
|
||||
to it.
|
||||
|
||||
2) That under Linux the entry is named __start
|
||||
and not just plain _start. */
|
||||
|
||||
#define RTLD_START asm ("\
|
||||
.text\n\
|
||||
.align 3\n"\
|
||||
_RTLD_PROLOGUE (ENTRY_POINT)\
|
||||
" .globl _dl_start_user\n\
|
||||
.set noreorder\n\
|
||||
bltzal $0, 0f\n\
|
||||
nop\n\
|
||||
0: .cpload $31\n\
|
||||
.set reorder\n\
|
||||
# i386 ABI book says that the first entry of GOT holds\n\
|
||||
# the address of the dynamic structure. Though MIPS ABI\n\
|
||||
# doesn't say nothing about this, I emulate this here.\n\
|
||||
dla $4, _DYNAMIC\n\
|
||||
sd $4, -0x7ff0($28)\n\
|
||||
dsubu $29, 16\n\
|
||||
move $4, $29\n\
|
||||
jal _dl_start\n\
|
||||
daddiu $29, 16\n\
|
||||
# Get the value of label '_dl_start_user' in t9 ($25).\n\
|
||||
dla $25, _dl_start_user\n\
|
||||
_dl_start_user:\n\
|
||||
.set noreorder\n\
|
||||
.cpload $25\n\
|
||||
.set reorder\n\
|
||||
move $16, $28\n\
|
||||
# Save the user entry point address in saved register.\n\
|
||||
move $17, $2\n\
|
||||
# Store the highest stack address\n\
|
||||
sd $29, __libc_stack_end\n\
|
||||
# See if we were run as a command with the executable file\n\
|
||||
# name as an extra leading argument.\n\
|
||||
ld $2, _dl_skip_args\n\
|
||||
beq $2, $0, 1f\n\
|
||||
# Load the original argument count.\n\
|
||||
ld $4, 0($29)\n\
|
||||
# Subtract _dl_skip_args from it.\n\
|
||||
dsubu $4, $2\n\
|
||||
# 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, _rtld_local\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_internal\n\
|
||||
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, _rtld_local\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_internal\n\
|
||||
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)
|
||||
{
|
||||
const unsigned long int r_type = ELFW(R_TYPE) (reloc->r_info);
|
||||
ElfW(Addr) loadbase;
|
||||
ElfW(Addr) undo __attribute__ ((unused));
|
||||
|
||||
switch (r_type)
|
||||
{
|
||||
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. */
|
||||
# ifndef SHARED
|
||||
weak_extern (GL(dl_rtld_map));
|
||||
# endif
|
||||
if (map == &GL(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;
|
||||
#ifndef RTLD_BOOTSTRAP
|
||||
case R_MIPS_NONE: /* Alright, Wilbur. */
|
||||
break;
|
||||
#endif
|
||||
default:
|
||||
_dl_reloc_bad_type (map, r_type, 0);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
static inline void
|
||||
elf_machine_rel_relative (ElfW(Addr) l_addr, const ElfW(Rel) *reloc,
|
||||
ElfW(Addr) *const reloc_addr)
|
||||
{
|
||||
/* XXX Nothing to do. There is no relative relocation, right? */
|
||||
}
|
||||
|
||||
static inline void
|
||||
elf_machine_lazy_rel (struct link_map *map, ElfW(Addr) l_addr,
|
||||
const ElfW(Rel) *reloc)
|
||||
{
|
||||
/* Do nothing. */
|
||||
}
|
||||
|
||||
#endif /* RESOLVE */
|
Loading…
Reference in New Issue