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2005-05-09 Daniel Jacobowitz <dan@codesourcery.com>

Browse Source 
Mark Mitchell  <mark@codesourcery.com>

    	* sysdeps/arm/bits/link.h: New file.
	* sysdeps/arm/dl-trampoline.S: New file.
	* sysdeps/arm/dl-machine.h: Check RESOLVE_MAP instead of RESOLVE.
	(elf_machine_runtime_setup): Check dl_profile before calling
	_dl_name_match_p.
	(ELF_MACHINE_RUNTIME_TRAMPOLINE): Delete.
	(elf_machine_rel, elf_machine_rela): Use RESOLVE_MAP.
	(fix_bad_pc24): Use auto instead of static.
This commit is contained in:
Phil Blundell 2005-06-10 11:33:52 +00:00
parent efaef362b3
commit 849e84dde3
4 changed files with 301 additions and 123 deletions
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12
ChangeLog.arm
View File

@ -1,3 +1,15 @@
2005-05-09 Daniel Jacobowitz <dan@codesourcery.com>
Mark Mitchell <mark@codesourcery.com>
* sysdeps/arm/bits/link.h: New file.
* sysdeps/arm/dl-trampoline.S: New file.
* sysdeps/arm/dl-machine.h: Check RESOLVE_MAP instead of RESOLVE.
(elf_machine_runtime_setup): Check dl_profile before calling
_dl_name_match_p.
(ELF_MACHINE_RUNTIME_TRAMPOLINE): Delete.
(elf_machine_rel, elf_machine_rela): Use RESOLVE_MAP.
(fix_bad_pc24): Use auto instead of static.
2005-05-09 Daniel Jacobowitz <dan@codesourcery.com>
Mark Mitchell <mark@codesourcery.com>

66
sysdeps/arm/bits/link.h
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@ -0,0 +1,66 @@
/* Copyright (C) 2005 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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 _LINK_H
# error "Never include <bits/link.h> directly; use <link.h> instead."
#endif
/* Registers for entry into PLT on ARM. */
typedef struct La_arm_regs
{
uint32_t lr_reg[4];
uint32_t lr_sp;
uint32_t lr_lr;
/* Coprocessor registers used for argument passing. The data
stored here depends on the coprocessors available in the
system which are used for function calls in the current ABI.
VFP uses eight 64-bit registers, and iWMMXt uses ten. */
uint32_t lr_coproc[42];
} La_arm_regs;
/* Return values for calls from PLT on ARM. */
typedef struct La_arm_retval
{
/* Up to four integer registers can be used for a return value in
some ABIs (APCS complex long double). */
uint32_t lrv_reg[4];
/* Any coprocessor registers which might be used to return values
in the current ABI. */
uint32_t lrv_coproc[12];
} La_arm_retval;
__BEGIN_DECLS
extern Elf32_Addr la_arm_gnu_pltenter (Elf32_Sym *__sym, unsigned int __ndx,
uintptr_t *__refcook,
uintptr_t *__defcook,
La_arm_regs *__regs,
unsigned int *__flags,
const char *__symname,
long int *__framesizep);
extern unsigned int la_arm_gnu_pltexit (Elf32_Sym *__sym, unsigned int __ndx,
uintptr_t *__refcook,
uintptr_t *__defcook,
const La_arm_regs *__inregs,
La_arm_retval *__outregs,
const char *symname);
__END_DECLS

132
sysdeps/arm/dl-machine.h
View File

@ -110,7 +110,8 @@ elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
{
got[2] = (Elf32_Addr) &_dl_runtime_profile;
if (_dl_name_match_p (GLRO(dl_profile), l))
if (GLRO(dl_profile) != NULL
&& _dl_name_match_p (GLRO(dl_profile), l))
/* Say that we really want profiling and the timers are
started. */
GL(dl_profile_map) = l;
@ -129,119 +130,6 @@ elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
#define BX(x) "mov\tpc, " #x
#endif
#ifndef PROF
# define ELF_MACHINE_RUNTIME_TRAMPOLINE asm ("\
.text\n\
.globl _dl_runtime_resolve\n\
.type _dl_runtime_resolve, #function\n\
.align 2\n\
_dl_runtime_resolve:\n\
@ we get called with\n\
@ stack[0] contains the return address from this call\n\
@ ip contains &GOT[n+3] (pointer to function)\n\
@ lr points to &GOT[2]\n\
\n\
@ stack arguments\n\
stmdb sp!,{r0-r3}\n\
\n\
@ get pointer to linker struct\n\
ldr r0, [lr, #-4]\n\
\n\
@ prepare to call fixup()\n\
@ change &GOT[n+3] into 8*n NOTE: reloc are 8 bytes each\n\
sub r1, ip, lr\n\
sub r1, r1, #4\n\
add r1, r1, r1\n\
\n\
@ call fixup routine\n\
bl fixup\n\
\n\
@ save the return\n\
mov ip, r0\n\
\n\
@ get arguments and return address back\n\
ldmia sp!, {r0-r3,lr}\n\
\n\
@ jump to the newly found address\n\
" BX(ip) "\n\
\n\
.size _dl_runtime_resolve, .-_dl_runtime_resolve\n\
\n\
.globl _dl_runtime_profile\n\
.type _dl_runtime_profile, #function\n\
.align 2\n\
_dl_runtime_profile:\n\
@ stack arguments\n\
stmdb sp!, {r0-r3}\n\
\n\
@ get pointer to linker struct\n\
ldr r0, [lr, #-4]\n\
\n\
@ prepare to call fixup()\n\
@ change &GOT[n+3] into 8*n NOTE: reloc are 8 bytes each\n\
sub r1, ip, lr\n\
sub r1, r1, #4\n\
add r1, r1, r1\n\
\n\
@ call profiling fixup routine\n\
bl profile_fixup\n\
\n\
@ save the return\n\
mov ip, r0\n\
\n\
@ get arguments and return address back\n\
ldmia sp!, {r0-r3,lr}\n\
\n\
@ jump to the newly found address\n\
" BX(ip) "\n\
\n\
.size _dl_runtime_resolve, .-_dl_runtime_resolve\n\
.previous\n\
");
#else // PROF
# define ELF_MACHINE_RUNTIME_TRAMPOLINE asm ("\
.text\n\
.globl _dl_runtime_resolve\n\
.globl _dl_runtime_profile\n\
.type _dl_runtime_resolve, #function\n\
.type _dl_runtime_profile, #function\n\
.align 2\n\
_dl_runtime_resolve:\n\
_dl_runtime_profile:\n\
@ we get called with\n\
@ stack[0] contains the return address from this call\n\
@ ip contains &GOT[n+3] (pointer to function)\n\
@ lr points to &GOT[2]\n\
\n\
@ stack arguments\n\
stmdb sp!, {r0-r3}\n\
\n\
@ get pointer to linker struct\n\
ldr r0, [lr, #-4]\n\
\n\
@ prepare to call fixup()\n\
@ change &GOT[n+3] into 8*n NOTE: reloc are 8 bytes each\n\
sub r1, ip, lr\n\
sub r1, r1, #4\n\
add r1, r1, r1\n\
\n\
@ call profiling fixup routine\n\
bl fixup\n\
\n\
@ save the return\n\
mov ip, r0\n\
\n\
@ get arguments and return address back\n\
ldmia sp!, {r0-r3,lr}\n\
\n\
@ jump to the newly found address\n\
" BX(ip) "\n\
\n\
.size _dl_runtime_profile, .-_dl_runtime_profile\n\
.previous\n\
");
#endif //PROF
/* Mask identifying addresses reserved for the user program,
where the dynamic linker should not map anything. */
#define ELF_MACHINE_USER_ADDRESS_MASK 0xf8000000UL
@ -355,10 +243,10 @@ elf_machine_plt_value (struct link_map *map, const Elf32_Rel *reloc,
Prelinked libraries may use Elf32_Rela though. */
#define ELF_MACHINE_NO_RELA defined RTLD_BOOTSTRAP
#ifdef RESOLVE
#ifdef RESOLVE_MAP
/* Deal with an out-of-range PC24 reloc. */
static Elf32_Addr
auto Elf32_Addr
fix_bad_pc24 (Elf32_Addr *const reloc_addr, Elf32_Addr value)
{
static void *fix_page;
@ -425,9 +313,8 @@ elf_machine_rel (struct link_map *map, const Elf32_Rel *reloc,
#endif
{
const Elf32_Sym *const refsym = sym;
Elf32_Addr value = RESOLVE (&sym, version, r_type);
if (sym)
value += sym->st_value;
struct link_map *sym_map = RESOLVE_MAP (&sym, version, r_type);
Elf32_Addr value = sym_map == NULL ? 0 : sym_map->l_addr + sym->st_value;
switch (r_type)
{
@ -535,9 +422,8 @@ elf_machine_rela (struct link_map *map, const Elf32_Rela *reloc,
# ifndef RESOLVE_CONFLICT_FIND_MAP
const Elf32_Sym *const refsym = sym;
# endif
Elf32_Addr value = RESOLVE (&sym, version, r_type);
if (sym)
value += sym->st_value;
struct link_map *sym_map = RESOLVE_MAP (&sym, version, r_type);
Elf32_Addr value = sym_map == NULL ? 0 : sym_map->l_addr + sym->st_value;
switch (r_type)
{
@ -637,4 +523,4 @@ elf_machine_lazy_rel (struct link_map *map,
_dl_reloc_bad_type (map, r_type, 1);
}
#endif /* RESOLVE */
#endif /* RESOLVE_MAP */

214
sysdeps/arm/dl-trampoline.S Normal file
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@ -0,0 +1,214 @@
/* PLT trampolines. ARM version.
Copyright (C) 2005 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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. */
#include <sysdep.h>
#include <libc-symbols.h>
#if defined(__USE_BX__)
#define BX(x) bx x
#else
#define BX(x) mov pc, x
#endif
.text
.globl _dl_runtime_resolve
.type _dl_runtime_resolve, #function
cfi_startproc
.align 2
_dl_runtime_resolve:
cfi_adjust_cfa_offset (4)
cfi_rel_offset (lr, 0)
@ we get called with
@ stack[0] contains the return address from this call
@ ip contains &GOT[n+3] (pointer to function)
@ lr points to &GOT[2]
@ Save arguments. We save r4 to realign the stack.
stmdb sp!,{r0-r4}
cfi_adjust_cfa_offset (20)
cfi_rel_offset (r0, 0)
cfi_rel_offset (r1, 4)
cfi_rel_offset (r2, 8)
cfi_rel_offset (r3, 12)
@ get pointer to linker struct
ldr r0, [lr, #-4]
@ prepare to call _dl_fixup()
@ change &GOT[n+3] into 8*n NOTE: reloc are 8 bytes each
sub r1, ip, lr
sub r1, r1, #4
add r1, r1, r1
@ call fixup routine
bl _dl_fixup
@ save the return
mov ip, r0
@ get arguments and return address back. We restore r4
@ only to realign the stack.
ldmia sp!, {r0-r4,lr}
cfi_adjust_cfa_offset (-24)
@ jump to the newly found address
BX(ip)
cfi_endproc
.size _dl_runtime_resolve, .-_dl_runtime_resolve
.globl _dl_runtime_profile
.type _dl_runtime_profile, #function
cfi_startproc
.align 2
_dl_runtime_profile:
cfi_adjust_cfa_offset (4)
cfi_rel_offset (lr, 0)
@ we get called with
@ stack[0] contains the return address from this call
@ ip contains &GOT[n+3] (pointer to function)
@ lr points to &GOT[2]
@ Stack layout:
@ 212 - saved lr
@ 208 - framesize returned from pltenter
@ 16 - La_arm_regs
@ 8 - Saved two arguments to _dl_profile_fixup
@ 4 - Saved result of _dl_profile_fixup
@ 0 - outgoing argument to _dl_profile_fixup
@ For now, we only save the general purpose registers.
sub sp, sp, #196
cfi_adjust_cfa_offset (196)
stmia sp, {r0-r3}
cfi_rel_offset (r0, 0)
cfi_rel_offset (r1, 4)
cfi_rel_offset (r2, 8)
cfi_rel_offset (r3, 12)
sub sp, sp, #16
cfi_adjust_cfa_offset (16)
@ Save sp and lr.
add r0, sp, #216
str r0, [sp, #32]
ldr r2, [sp, #212]
str r2, [sp, #36]
@ get pointer to linker struct
ldr r0, [lr, #-4]
@ prepare to call _dl_profile_fixup()
@ change &GOT[n+3] into 8*n NOTE: reloc are 8 bytes each
sub r1, ip, lr
sub r1, r1, #4
add r1, r1, r1
@ Save these two arguments for pltexit.
add r3, sp, #8
stmia r3!, {r0,r1}
@ Set up extra args for _dl_profile_fixup.
@ r2 and r3 are already loaded.
add ip, sp, #208
str ip, [sp, #0]
@ call profiling fixup routine
bl _dl_profile_fixup
@ The address to call is now in r0.
@ Check whether we're wrapping this function.
ldr ip, [sp, #208]
cmp ip, #0
bge 1f
cfi_remember_state
@ save the return
mov ip, r0
@ get arguments and return address back
add sp, sp, #16
cfi_adjust_cfa_offset (-16)
ldmia sp, {r0-r3,sp,lr}
cfi_adjust_cfa_offset (-200)
@ jump to the newly found address
BX(ip)
cfi_restore_state
1:
@ The new frame size is in ip.
@ New stack layout:
@ 268 - saved r7
@ 264 - saved result of _dl_profile_fixup
@ 72 - La_arm_regs
@ 64 - Saved two arguments to _dl_profile_fixup
@ 0 - La_arm_retval
@ For now, we only save the general purpose registers.
@ Build the new frame.
str r7, [sp, #212]
cfi_rel_offset (r7, 212)
sub r7, sp, #56
cfi_def_cfa_register (r7)
cfi_adjust_cfa_offset (56)
sub sp, sp, ip
bic sp, sp, #7
@ Save the _dl_profile_fixup result around the call to memcpy.
str r0, [r7, #264]
@ Copy the stack arguments.
mov r0, sp
add r1, r7, #272
mov r2, ip
bl memcpy
@ Call the function.
add ip, r7, #72
ldmia ip, {r0-r3}
ldr ip, [r7, #264]
mov lr, pc
BX(ip)
stmia r7, {r0-r3}
@ Call pltexit.
add ip, r7, #64
ldmia ip, {r0,r1}
add r2, r7, #72
add r3, r7, #0
bl _dl_call_pltexit
@ Return to caller.
ldmia r7, {r0-r3}
mov sp, r7
cfi_def_cfa_register (sp)
ldr r7, [sp, #268]
ldr lr, [sp, #92]
add sp, sp, #272
cfi_adjust_cfa_offset (-272)
BX(lr)
cfi_endproc
.size _dl_runtime_resolve, .-_dl_runtime_resolve
.previous