577e4aa1ec
Use it instead of __THUMB_INTERWORK__. Make RETINSTR take only a condition and a register. * sysdeps/arm/dl-machine.h: Use __USE_BX__ instead of __THUMB_INTERWORK__. (_dl_start_user): Use BX. * sysdeps/arm/strlen.S: Use DO_RET. * sysdeps/unix/arm/brk.S, sysdeps/unix/arm/fork.S, sysdeps/unix/arm/sysdep.S, sysdeps/unix/arm/sysdep.h: Likewise. * sysdeps/unix/sysv/linux/arm/clone.S, sysdeps/unix/sysv/linux/arm/mmap.S, sysdeps/unix/sysv/linux/arm/mmap64.S, sysdeps/unix/sysv/linux/arm/socket.S, sysdeps/unix/sysv/linux/arm/sysdep.h, sysdeps/unix/sysv/linux/arm/vfork.S: Update uses of RETINSTR.
637 lines
18 KiB
C
637 lines
18 KiB
C
/* Machine-dependent ELF dynamic relocation inline functions. ARM version.
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Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
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Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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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 "ARM"
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#include <sys/param.h>
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#define VALID_ELF_ABIVERSION(ver) (ver == 0)
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#define VALID_ELF_OSABI(osabi) \
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(osabi == ELFOSABI_SYSV || osabi == ELFOSABI_ARM)
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#define VALID_ELF_HEADER(hdr,exp,size) \
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memcmp (hdr,exp,size-2) == 0 \
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&& VALID_ELF_OSABI (hdr[EI_OSABI]) \
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&& VALID_ELF_ABIVERSION (hdr[EI_ABIVERSION])
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#define CLEAR_CACHE(BEG,END) \
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{ \
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register unsigned long _beg __asm ("a1") = (unsigned long)(BEG); \
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register unsigned long _end __asm ("a2") = (unsigned long)(END); \
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register unsigned long _flg __asm ("a3") = 0; \
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__asm __volatile ("swi 0x9f0002 @ sys_cacheflush" \
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: /* no outputs */ \
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: /* no inputs */ \
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: "a1"); \
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}
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/* Return nonzero iff ELF header is compatible with the running host. */
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static inline int __attribute__ ((unused))
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elf_machine_matches_host (const Elf32_Ehdr *ehdr)
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{
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return ehdr->e_machine == EM_ARM;
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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 Elf32_Addr __attribute__ ((unused))
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elf_machine_dynamic (void)
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{
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register Elf32_Addr *got asm ("r10");
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return *got;
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}
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/* Return the run-time load address of the shared object. */
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static inline Elf32_Addr __attribute__ ((unused))
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elf_machine_load_address (void)
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{
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extern void __dl_start asm ("_dl_start");
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Elf32_Addr got_addr = (Elf32_Addr) &__dl_start;
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Elf32_Addr pcrel_addr;
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asm ("adr %0, _dl_start" : "=r" (pcrel_addr));
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return pcrel_addr - got_addr;
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}
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/* Set up the loaded object described by L so its unrelocated PLT
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entries will jump to the on-demand fixup code in dl-runtime.c. */
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static inline int __attribute__ ((unused))
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elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
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{
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Elf32_Addr *got;
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extern void _dl_runtime_resolve (Elf32_Word);
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extern void _dl_runtime_profile (Elf32_Word);
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if (l->l_info[DT_JMPREL] && lazy)
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{
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/* patb: this is different than i386 */
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/* The GOT entries for functions in the PLT have not yet been filled
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in. Their initial contents will arrange when called to push an
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index into the .got section, load ip with &_GLOBAL_OFFSET_TABLE_[3],
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and then jump to _GLOBAL_OFFSET_TABLE[2]. */
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got = (Elf32_Addr *) D_PTR (l, l_info[DT_PLTGOT]);
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/* If a library is prelinked but we have to relocate anyway,
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we have to be able to undo the prelinking of .got.plt.
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The prelinker saved us here address of .plt. */
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if (got[1])
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l->l_mach.plt = got[1] + l->l_addr;
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got[1] = (Elf32_Addr) l; /* Identify this shared object. */
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/* The got[2] entry contains the address of a function which gets
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called to get the address of a so far unresolved function and
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jump to it. The profiling extension of the dynamic linker allows
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to intercept the calls to collect information. In this case we
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don't store the address in the GOT so that all future calls also
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end in this function. */
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if (profile)
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{
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got[2] = (Elf32_Addr) &_dl_runtime_profile;
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if (_dl_name_match_p (GLRO(dl_profile), l))
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/* Say that we really want profiling and the timers are
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started. */
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GL(dl_profile_map) = l;
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}
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else
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/* This function will get called to fix up the GOT entry indicated by
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the offset on the stack, and then jump to the resolved address. */
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got[2] = (Elf32_Addr) &_dl_runtime_resolve;
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}
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return lazy;
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}
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#if defined(__USE_BX__)
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#define BX(x) "bx\t" #x
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#else
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#define BX(x) "mov\tpc, " #x
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#endif
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#ifndef PROF
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# define ELF_MACHINE_RUNTIME_TRAMPOLINE asm ("\
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.text\n\
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.globl _dl_runtime_resolve\n\
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.type _dl_runtime_resolve, #function\n\
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.align 2\n\
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_dl_runtime_resolve:\n\
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@ we get called with\n\
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@ stack[0] contains the return address from this call\n\
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@ ip contains &GOT[n+3] (pointer to function)\n\
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@ lr points to &GOT[2]\n\
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\n\
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@ stack arguments\n\
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stmdb sp!,{r0-r3}\n\
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\n\
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@ get pointer to linker struct\n\
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ldr r0, [lr, #-4]\n\
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\n\
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@ prepare to call fixup()\n\
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@ change &GOT[n+3] into 8*n NOTE: reloc are 8 bytes each\n\
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sub r1, ip, lr\n\
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sub r1, r1, #4\n\
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add r1, r1, r1\n\
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\n\
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@ call fixup routine\n\
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bl fixup\n\
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\n\
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@ save the return\n\
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mov ip, r0\n\
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\n\
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@ get arguments and return address back\n\
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ldmia sp!, {r0-r3,lr}\n\
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\n\
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@ jump to the newly found address\n\
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" BX(ip) "\n\
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\n\
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.size _dl_runtime_resolve, .-_dl_runtime_resolve\n\
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\n\
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.globl _dl_runtime_profile\n\
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.type _dl_runtime_profile, #function\n\
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.align 2\n\
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_dl_runtime_profile:\n\
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@ stack arguments\n\
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stmdb sp!, {r0-r3}\n\
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\n\
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@ get pointer to linker struct\n\
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ldr r0, [lr, #-4]\n\
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\n\
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@ prepare to call fixup()\n\
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@ change &GOT[n+3] into 8*n NOTE: reloc are 8 bytes each\n\
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sub r1, ip, lr\n\
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sub r1, r1, #4\n\
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add r1, r1, r1\n\
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\n\
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@ call profiling fixup routine\n\
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bl profile_fixup\n\
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\n\
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@ save the return\n\
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mov ip, r0\n\
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\n\
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@ get arguments and return address back\n\
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ldmia sp!, {r0-r3,lr}\n\
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\n\
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@ jump to the newly found address\n\
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" BX(ip) "\n\
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\n\
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.size _dl_runtime_resolve, .-_dl_runtime_resolve\n\
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.previous\n\
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");
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#else // PROF
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# define ELF_MACHINE_RUNTIME_TRAMPOLINE asm ("\
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.text\n\
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.globl _dl_runtime_resolve\n\
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.globl _dl_runtime_profile\n\
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.type _dl_runtime_resolve, #function\n\
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.type _dl_runtime_profile, #function\n\
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.align 2\n\
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_dl_runtime_resolve:\n\
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_dl_runtime_profile:\n\
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@ we get called with\n\
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@ stack[0] contains the return address from this call\n\
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@ ip contains &GOT[n+3] (pointer to function)\n\
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@ lr points to &GOT[2]\n\
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\n\
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@ stack arguments\n\
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stmdb sp!, {r0-r3}\n\
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\n\
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@ get pointer to linker struct\n\
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ldr r0, [lr, #-4]\n\
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\n\
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@ prepare to call fixup()\n\
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@ change &GOT[n+3] into 8*n NOTE: reloc are 8 bytes each\n\
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sub r1, ip, lr\n\
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sub r1, r1, #4\n\
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add r1, r1, r1\n\
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\n\
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@ call profiling fixup routine\n\
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bl fixup\n\
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\n\
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@ save the return\n\
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mov ip, r0\n\
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\n\
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@ get arguments and return address back\n\
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ldmia sp!, {r0-r3,lr}\n\
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\n\
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@ jump to the newly found address\n\
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" BX(ip) "\n\
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\n\
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.size _dl_runtime_profile, .-_dl_runtime_profile\n\
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.previous\n\
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");
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#endif //PROF
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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 0xf8000000UL
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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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#define RTLD_START asm ("\
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.text\n\
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.globl _start\n\
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.globl _dl_start_user\n\
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_start:\n\
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@ we are PIC code, so get global offset table\n\
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ldr sl, .L_GET_GOT\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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ldr r4, .L_SKIP_ARGS\n\
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@ at start time, all the args are on the stack\n\
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mov r0, sp\n\
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bl _dl_start\n\
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@ returns user entry point in r0\n\
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_dl_start_user:\n\
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add sl, pc, sl\n\
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.L_GOT_GOT:\n\
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ldr r4, [sl, r4]\n\
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@ get the original arg count\n\
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ldr r1, [sp]\n\
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@ save the entry point in another register\n\
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mov r6, r0\n\
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@ adjust the stack pointer to skip the extra args\n\
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add sp, sp, r4, lsl #2\n\
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@ subtract _dl_skip_args from original arg count\n\
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sub r1, r1, r4\n\
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@ get the argv address\n\
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add r2, sp, #4\n\
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@ store the new argc in the new stack location\n\
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str r1, [sp]\n\
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@ compute envp\n\
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add r3, r2, r1, lsl #2\n\
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add r3, r3, #4\n\
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\n\
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@ now we call _dl_init\n\
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ldr r0, .L_LOADED\n\
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ldr r0, [sl, r0]\n\
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@ call _dl_init\n\
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bl _dl_init_internal(PLT)\n\
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@ load the finalizer function\n\
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ldr r0, .L_FINI_PROC\n\
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add r0, sl, r0\n\
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@ jump to the user_s entry point\n\
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" BX(r6) "\n\
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.L_GET_GOT:\n\
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.word _GLOBAL_OFFSET_TABLE_ - .L_GOT_GOT - 4\n\
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.L_SKIP_ARGS:\n\
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.word _dl_skip_args(GOTOFF)\n\
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.L_FINI_PROC:\n\
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.word _dl_fini(GOTOFF)\n\
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.L_LOADED:\n\
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.word _rtld_local(GOTOFF)\n\
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.previous\n\
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");
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/* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry, so
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PLT entries should not be allowed to define the value.
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ELF_RTYPE_CLASS_NOCOPY iff TYPE should not be allowed to resolve to one
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of the main executable's symbols, as for a COPY reloc. */
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#define elf_machine_type_class(type) \
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((((type) == R_ARM_JUMP_SLOT) * ELF_RTYPE_CLASS_PLT) \
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| (((type) == R_ARM_COPY) * ELF_RTYPE_CLASS_COPY))
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/* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */
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#define ELF_MACHINE_JMP_SLOT R_ARM_JUMP_SLOT
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/* ARM never uses Elf32_Rela relocations for the dynamic linker.
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Prelinked libraries may use Elf32_Rela though. */
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#define ELF_MACHINE_PLT_REL 1
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/* We define an initialization functions. This is called very early in
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_dl_sysdep_start. */
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#define DL_PLATFORM_INIT dl_platform_init ()
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static inline void __attribute__ ((unused))
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dl_platform_init (void)
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{
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if (GLRO(dl_platform) != NULL && *GLRO(dl_platform) == '\0')
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/* Avoid an empty string which would disturb us. */
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GLRO(dl_platform) = NULL;
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}
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static inline Elf32_Addr
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elf_machine_fixup_plt (struct link_map *map, lookup_t t,
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const Elf32_Rel *reloc,
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Elf32_Addr *reloc_addr, Elf32_Addr value)
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{
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return *reloc_addr = value;
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}
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/* Return the final value of a plt relocation. */
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static inline Elf32_Addr
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elf_machine_plt_value (struct link_map *map, const Elf32_Rel *reloc,
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Elf32_Addr value)
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{
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return value;
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}
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#endif /* !dl_machine_h */
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#ifdef RESOLVE
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/* ARM never uses Elf32_Rela relocations for the dynamic linker.
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Prelinked libraries may use Elf32_Rela though. */
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# ifdef RTLD_BOOTSTRAP
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# define ELF_MACHINE_NO_RELA 1
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# endif
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/* Deal with an out-of-range PC24 reloc. */
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static Elf32_Addr
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fix_bad_pc24 (Elf32_Addr *const reloc_addr, Elf32_Addr value)
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{
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static void *fix_page;
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static unsigned int fix_offset;
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static size_t pagesize;
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Elf32_Word *fix_address;
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if (! fix_page)
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{
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if (! pagesize)
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pagesize = getpagesize ();
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fix_page = mmap (NULL, pagesize, PROT_READ | PROT_WRITE | PROT_EXEC,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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if (! fix_page)
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assert (! "could not map page for fixup");
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fix_offset = 0;
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}
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fix_address = (Elf32_Word *)(fix_page + fix_offset);
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fix_address[0] = 0xe51ff004; /* ldr pc, [pc, #-4] */
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fix_address[1] = value;
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fix_offset += 8;
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if (fix_offset >= pagesize)
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fix_page = NULL;
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return (Elf32_Addr)fix_address;
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}
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/* Perform the relocation specified by RELOC and SYM (which is fully resolved).
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MAP is the object containing the reloc. */
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static inline void
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elf_machine_rel (struct link_map *map, const Elf32_Rel *reloc,
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const Elf32_Sym *sym, const struct r_found_version *version,
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void *const reloc_addr_arg)
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|
{
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Elf32_Addr *const reloc_addr = reloc_addr_arg;
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const unsigned int r_type = ELF32_R_TYPE (reloc->r_info);
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#if !defined RTLD_BOOTSTRAP || !defined HAVE_Z_COMBRELOC
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if (__builtin_expect (r_type == R_ARM_RELATIVE, 0))
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{
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# if !defined RTLD_BOOTSTRAP && !defined HAVE_Z_COMBRELOC
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/* This is defined in rtld.c, but nowhere in the static libc.a;
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make the reference weak so static programs can still link.
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This declaration cannot be done when compiling rtld.c
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(i.e. #ifdef RTLD_BOOTSTRAP) because rtld.c contains the
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common defn for _dl_rtld_map, which is incompatible with a
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weak decl in the same file. */
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# ifndef SHARED
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weak_extern (_dl_rtld_map);
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# endif
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if (map != &GL(dl_rtld_map)) /* Already done in rtld itself. */
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# endif
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*reloc_addr += map->l_addr;
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}
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# ifndef RTLD_BOOTSTRAP
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else if (__builtin_expect (r_type == R_ARM_NONE, 0))
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return;
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# endif
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else
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#endif
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{
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const Elf32_Sym *const refsym = sym;
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Elf32_Addr value = RESOLVE (&sym, version, r_type);
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if (sym)
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value += sym->st_value;
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switch (r_type)
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{
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case R_ARM_COPY:
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if (sym == NULL)
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/* This can happen in trace mode if an object could not be
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found. */
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break;
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if (sym->st_size > refsym->st_size
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|| (GLRO(dl_verbose) && sym->st_size < refsym->st_size))
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{
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const char *strtab;
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strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]);
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_dl_error_printf ("\
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%s: Symbol `%s' has different size in shared object, consider re-linking\n",
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rtld_progname ?: "<program name unknown>",
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strtab + refsym->st_name);
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}
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memcpy (reloc_addr_arg, (void *) value,
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|
MIN (sym->st_size, refsym->st_size));
|
|
break;
|
|
case R_ARM_GLOB_DAT:
|
|
case R_ARM_JUMP_SLOT:
|
|
# ifdef RTLD_BOOTSTRAP
|
|
/* Fix weak undefined references. */
|
|
if (sym != NULL && sym->st_value == 0)
|
|
*reloc_addr = 0;
|
|
else
|
|
# endif
|
|
*reloc_addr = value;
|
|
break;
|
|
case R_ARM_ABS32:
|
|
{
|
|
# 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 (_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. */
|
|
value -= map->l_addr + refsym->st_value;
|
|
# endif
|
|
*reloc_addr += value;
|
|
break;
|
|
}
|
|
case R_ARM_PC24:
|
|
{
|
|
Elf32_Sword addend;
|
|
Elf32_Addr newvalue, topbits;
|
|
|
|
addend = *reloc_addr & 0x00ffffff;
|
|
if (addend & 0x00800000) addend |= 0xff000000;
|
|
|
|
newvalue = value - (Elf32_Addr)reloc_addr + (addend << 2);
|
|
topbits = newvalue & 0xfe000000;
|
|
if (topbits != 0xfe000000 && topbits != 0x00000000)
|
|
{
|
|
newvalue = fix_bad_pc24(reloc_addr, value)
|
|
- (Elf32_Addr)reloc_addr + (addend << 2);
|
|
topbits = newvalue & 0xfe000000;
|
|
if (topbits != 0xfe000000 && topbits != 0x00000000)
|
|
{
|
|
_dl_signal_error (0, map->l_name, NULL,
|
|
"R_ARM_PC24 relocation out of range");
|
|
}
|
|
}
|
|
newvalue >>= 2;
|
|
value = (*reloc_addr & 0xff000000) | (newvalue & 0x00ffffff);
|
|
*reloc_addr = value;
|
|
}
|
|
break;
|
|
default:
|
|
_dl_reloc_bad_type (map, r_type, 0);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
# ifndef RTLD_BOOTSTRAP
|
|
static inline void
|
|
elf_machine_rela (struct link_map *map, const Elf32_Rela *reloc,
|
|
const Elf32_Sym *sym, const struct r_found_version *version,
|
|
void *const reloc_addr_arg)
|
|
{
|
|
Elf32_Addr *const reloc_addr = reloc_addr_arg;
|
|
const unsigned int r_type = ELF32_R_TYPE (reloc->r_info);
|
|
|
|
if (__builtin_expect (r_type == R_ARM_RELATIVE, 0))
|
|
*reloc_addr = map->l_addr + reloc->r_addend;
|
|
else if (__builtin_expect (r_type == R_ARM_NONE, 0))
|
|
return;
|
|
else
|
|
{
|
|
# 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;
|
|
|
|
switch (r_type)
|
|
{
|
|
# ifndef RESOLVE_CONFLICT_FIND_MAP
|
|
/* Not needed for dl-conflict.c. */
|
|
case R_ARM_COPY:
|
|
if (sym == NULL)
|
|
/* This can happen in trace mode if an object could not be
|
|
found. */
|
|
break;
|
|
if (sym->st_size > refsym->st_size
|
|
|| (GLRO(dl_verbose) && sym->st_size < refsym->st_size))
|
|
{
|
|
const char *strtab;
|
|
|
|
strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]);
|
|
_dl_error_printf ("\
|
|
%s: Symbol `%s' has different size in shared object, consider re-linking\n",
|
|
rtld_progname ?: "<program name unknown>",
|
|
strtab + refsym->st_name);
|
|
}
|
|
memcpy (reloc_addr_arg, (void *) value,
|
|
MIN (sym->st_size, refsym->st_size));
|
|
break;
|
|
# endif /* !RESOLVE_CONFLICT_FIND_MAP */
|
|
case R_ARM_GLOB_DAT:
|
|
case R_ARM_JUMP_SLOT:
|
|
case R_ARM_ABS32:
|
|
*reloc_addr = value + reloc->r_addend;
|
|
break;
|
|
case R_ARM_PC24:
|
|
{
|
|
Elf32_Addr newvalue, topbits;
|
|
|
|
newvalue = value + reloc->r_addend - (Elf32_Addr)reloc_addr;
|
|
topbits = newvalue & 0xfe000000;
|
|
if (topbits != 0xfe000000 && topbits != 0x00000000)
|
|
{
|
|
newvalue = fix_bad_pc24(reloc_addr, value)
|
|
- (Elf32_Addr)reloc_addr + (reloc->r_addend << 2);
|
|
topbits = newvalue & 0xfe000000;
|
|
if (topbits != 0xfe000000 && topbits != 0x00000000)
|
|
{
|
|
_dl_signal_error (0, map->l_name, NULL,
|
|
"R_ARM_PC24 relocation out of range");
|
|
}
|
|
}
|
|
newvalue >>= 2;
|
|
value = (*reloc_addr & 0xff000000) | (newvalue & 0x00ffffff);
|
|
*reloc_addr = value;
|
|
}
|
|
break;
|
|
default:
|
|
_dl_reloc_bad_type (map, r_type, 0);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
# endif
|
|
|
|
static inline void
|
|
elf_machine_rel_relative (Elf32_Addr l_addr, const Elf32_Rel *reloc,
|
|
void *const reloc_addr_arg)
|
|
{
|
|
Elf32_Addr *const reloc_addr = reloc_addr_arg;
|
|
*reloc_addr += l_addr;
|
|
}
|
|
|
|
# ifndef RTLD_BOOTSTRAP
|
|
static inline void
|
|
elf_machine_rela_relative (Elf32_Addr l_addr, const Elf32_Rela *reloc,
|
|
void *const reloc_addr_arg)
|
|
{
|
|
Elf32_Addr *const reloc_addr = reloc_addr_arg;
|
|
*reloc_addr = l_addr + reloc->r_addend;
|
|
}
|
|
# endif
|
|
|
|
static inline void
|
|
elf_machine_lazy_rel (struct link_map *map,
|
|
Elf32_Addr l_addr, const Elf32_Rel *reloc)
|
|
{
|
|
Elf32_Addr *const reloc_addr = (void *) (l_addr + reloc->r_offset);
|
|
const unsigned int r_type = ELF32_R_TYPE (reloc->r_info);
|
|
/* Check for unexpected PLT reloc type. */
|
|
if (__builtin_expect (r_type == R_ARM_JUMP_SLOT, 1))
|
|
{
|
|
if (__builtin_expect (map->l_mach.plt, 0) == 0)
|
|
*reloc_addr += l_addr;
|
|
else
|
|
*reloc_addr = map->l_mach.plt;
|
|
}
|
|
else
|
|
_dl_reloc_bad_type (map, r_type, 1);
|
|
}
|
|
|
|
#endif /* RESOLVE */
|