32e6df3621
2001-12-11 Jakub Jelinek <jakub@redhat.com> * elf/Makefile (dl-routines): Add conflict. (rtld-ldscript-in, rtld-ldscript, rtld-parms): Remove. (ld.so): Add _begin local symbol. * elf/elf.h (DT_VALTAGIDX, DT_VALNUM, DT_ADDRTAGIDX, DT_ADDRNUM): Define. * elf/dl-deps.c (_dl_build_local_scope): New. (_dl_map_object_deps): If LD_TRACE_PRELINKING, compute local scopes of all libraries. * elf/do-rel.h (VALIDX): Define. (elf_dynamic_do_rel): If ELF_MACHINE_PLT_REL is defined, don't do lazy binding for RELA. If DT_GNU_PRELINKED, DT_RELACOUNT relocations can be skipped. * elf/dl-conflict.c: New file. * elf/dl-lookup.c (_dl_debug_bindings): New. (_dl_lookup_symbol): Use _dl_debug_bindings. Reference_name is always non-NULL. (_dl_lookup_symbol_skip): Likewise. (_dl_lookup_versioned_symbol): Likewise. (_dl_lookup_versioned_symbol_skip): Likewise. * elf/dl-runtime.c (PLTREL): If ELF_MACHINE_PLT_REL is defined, define to ElfW(Rel). * elf/dynamic-link.h (elf_get_dynamic_info): Record selected dynamic tags in the DT_VALRNGLO..DT_VALRNGHI and DT_ADDRRNGLO..DT_ADDRRNGHI ranges. Don't adjust address dynamic tags if l_addr is 0. * elf/rtld.c (_dl_trace_prelink, _dl_trace_prelink_map): New variables. (_dl_start): Skip ELF_DYNAMIC_RELOCATE if ld.so is prelinked. (VALIDX, ADDRIDX): Define. (_dl_start_final): Initialize _dl_rtld_map's l_map_start and l_map_end. (dl_main): Print library list for LD_TRACE_PRELINKING. If prelinking information can be used, skip relocating libraries and call _dl_resolve_conflicts instead. (process_envvars): Handle LD_TRACE_PRELINKING envvar. * elf/dl-load.c (_dl_map_object): Don't create fake libs if LD_TRACE_PRELINKING. * include/link.h (struct link_map) [l_info]: Add DT_VALNUM + DT_ADDRNUM. * sysdeps/generic/ldsodefs.h (_dl_trace_prelink_map): New declaration. (DL_DEBUG_PRELINK): Define. (_dl_resolve_conflicts): Add prototype. * sysdeps/alpha/dl-machine.h (elf_machine_runtime_setup): Reinitialize .plt for prelinked libraries where prelinking info cannot be used. (elf_machine_rela): If relocating R_ALPHA_JMP_SLOT in .gnu.conflict section, use RESOLVE_CONFLICT_FIND_MAP to find out reloc's link_map. * sysdeps/arm/bits/link.h: New file. * sysdeps/arm/dl-machine.h (elf_machine_runtime_setup): Save original content of .got[1]. (ELF_MACHINE_NO_RELA): Only define if RTLD_BOOTSTRAP. (ELF_MACHINE_PLT_REL): Define. (elf_machine_rela, elf_machine_rela_relative): New. (elf_machine_lazy_rel): Reinitialize R_ARM_JUMP_SLOT address instead of adjusting it if prelinked and prelinking cannot be used. * sysdeps/i386/bits/link.h: New file. * sysdeps/i386/dl-machine.h (elf_machine_runtime_setup): Save original content of .got[1]. (ELF_MACHINE_NO_RELA): Only define if RTLD_BOOTSTRAP. (ELF_MACHINE_PLT_REL): Define. (elf_machine_rela, elf_machine_rela_relative): New. (elf_machine_lazy_rel): Reinitialize R_386_JUMP_SLOT address instead of adjusting it if prelinked and prelinking cannot be used. * sysdeps/powerpc/dl-machine.h (elf_machine_rela): If relocating conflicts, skip finaladdr computation. Use RESOLVE_CONFLICT_FIND_MAP to find out map for R_PPC_JMP_SLOT relocs. * sysdeps/sparc/sparc32/dl-machine.h (VALIDX): Define. (OPCODE_BA): Define. (elf_machine_runtime_setup): Reinitialize .plt for prelinked libraries where prelinking info cannot be used. (sparc_fixup_plt): Renamed from elf_machine_fixup_plt. (elf_machine_fixup_plt): Call sparc_fixup_plt. (elf_machine_rela): Set value to 0 if relocating conflicts. Call sparc_fixup_plt for R_SPARC_JMP_SLOT. * sysdeps/sparc/sparc64/dl-machine.h (VALIDX): Define. (sparc64_fixup_plt): Fix a typo. (elf_machine_rela): Set value to 0 if relocating conflicts. Handle R_SPARC_JMP_SLOT relocs when relocating conflicts. (elf_machine_runtime_setup): Reinitialize .plt for prelinked libraries where prelinking info cannot be used. * sysdeps/sh/bits/link.h: New file. * sysdeps/sh/dl-machine.h (elf_machine_runtime_setup): Save original content of .got[1]. (elf_machine_lazy_rel): Reinitialize R_SH_JMP_SLOT address instead of adjusting it if prelinked and prelinking cannot be used. * sysdeps/s390/s390-32/bits/link.h: New file. * sysdeps/s390/s390-32/dl-machine.h (elf_machine_runtime_setup): Save original content of .got[1]. (elf_machine_lazy_rel): Reinitialize R_390_JMP_SLOT address instead of adjusting it if prelinked and prelinking cannot be used. * sysdeps/s390/s390-64/bits/link.h: New file. * sysdeps/s390/s390-64/dl-machine.h (elf_machine_runtime_setup): Save original content of .got[1]. (elf_machine_lazy_rel): Reinitialize R_390_JMP_SLOT address instead of adjusting it if prelinked and prelinking cannot be used. * sysdeps/x86_64/bits/link.h: New file. * sysdeps/x86_64/dl-machine.h (elf_machine_runtime_setup): Save original content of .got[1]. (elf_machine_lazy_rel): Reinitialize R_X86_64_JMP_SLOT address instead of adjusting it if prelinked and prelinking cannot be used.
414 lines
13 KiB
C
414 lines
13 KiB
C
/* Machine-dependent ELF dynamic relocation inline functions. PowerPC version.
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Copyright (C) 1995-2000, 2001 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 "powerpc"
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#include <assert.h>
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/* Return nonzero iff ELF header is compatible with the running host. */
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static inline int
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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_PPC;
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}
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/* Return the link-time address of _DYNAMIC, stored as
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the first value in the GOT. */
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static inline Elf32_Addr
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elf_machine_dynamic (void)
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{
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Elf32_Addr *got;
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asm (" bl _GLOBAL_OFFSET_TABLE_-4@local"
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: "=l"(got));
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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
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elf_machine_load_address (void)
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{
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unsigned int *got;
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unsigned int *branchaddr;
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/* This is much harder than you'd expect. Possibly I'm missing something.
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The 'obvious' way:
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Apparently, "bcl 20,31,$+4" is what should be used to load LR
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with the address of the next instruction.
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I think this is so that machines that do bl/blr pairing don't
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get confused.
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asm ("bcl 20,31,0f ;"
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"0: mflr 0 ;"
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"lis %0,0b@ha;"
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"addi %0,%0,0b@l;"
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"subf %0,%0,0"
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: "=b" (addr) : : "r0", "lr");
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doesn't work, because the linker doesn't have to (and in fact doesn't)
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update the @ha and @l references; the loader (which runs after this
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code) will do that.
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Instead, we use the following trick:
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The linker puts the _link-time_ address of _DYNAMIC at the first
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word in the GOT. We could branch to that address, if we wanted,
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by using an @local reloc; the linker works this out, so it's safe
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to use now. We can't, of course, actually branch there, because
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we'd cause an illegal instruction exception; so we need to compute
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the address ourselves. That gives us the following code: */
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/* Get address of the 'b _DYNAMIC@local'... */
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asm ("bl 0f ;"
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"b _DYNAMIC@local;"
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"0:"
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: "=l"(branchaddr));
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/* ... and the address of the GOT. */
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asm (" bl _GLOBAL_OFFSET_TABLE_-4@local"
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: "=l"(got));
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/* So now work out the difference between where the branch actually points,
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and the offset of that location in memory from the start of the file. */
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return ((Elf32_Addr)branchaddr - *got
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+ ((int)(*branchaddr << 6 & 0xffffff00) >> 6));
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}
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#define ELF_MACHINE_BEFORE_RTLD_RELOC(dynamic_info) /* nothing */
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/* The PLT uses Elf32_Rela relocs. */
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#define elf_machine_relplt elf_machine_rela
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/* This code is used in dl-runtime.c to call the `fixup' function
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and then redirect to the address it returns. It is called
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from code built in the PLT by elf_machine_runtime_setup. */
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#if !defined PROF
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#define ELF_MACHINE_RUNTIME_TRAMPOLINE asm ("\n\
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.section \".text\" \n\
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.align 2 \n\
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.globl _dl_runtime_resolve \n\
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.type _dl_runtime_resolve,@function \n\
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_dl_runtime_resolve: \n\
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# We need to save the registers used to pass parameters, and register 0,\n\
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# which is used by _mcount; the registers are saved in a stack frame.\n\
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stwu 1,-64(1) \n\
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stw 0,12(1) \n\
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stw 3,16(1) \n\
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stw 4,20(1) \n\
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# The code that calls this has put parameters for `fixup' in r12 and r11.\n\
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mr 3,12 \n\
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stw 5,24(1) \n\
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mr 4,11 \n\
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stw 6,28(1) \n\
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mflr 0 \n\
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# We also need to save some of the condition register fields.\n\
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stw 7,32(1) \n\
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stw 0,48(1) \n\
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stw 8,36(1) \n\
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mfcr 0 \n\
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stw 9,40(1) \n\
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stw 10,44(1) \n\
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stw 0,8(1) \n\
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bl fixup@local \n\
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# 'fixup' returns the address we want to branch to.\n\
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mtctr 3 \n\
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# Put the registers back...\n\
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lwz 0,48(1) \n\
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lwz 10,44(1) \n\
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lwz 9,40(1) \n\
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mtlr 0 \n\
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lwz 8,36(1) \n\
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lwz 0,8(1) \n\
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lwz 7,32(1) \n\
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lwz 6,28(1) \n\
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mtcrf 0xFF,0 \n\
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lwz 5,24(1) \n\
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lwz 4,20(1) \n\
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lwz 3,16(1) \n\
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lwz 0,12(1) \n\
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# ...unwind the stack frame, and jump to the PLT entry we updated.\n\
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addi 1,1,64 \n\
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bctr \n\
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.size _dl_runtime_resolve,.-_dl_runtime_resolve \n\
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\n\
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.align 2 \n\
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.globl _dl_prof_resolve \n\
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.type _dl_prof_resolve,@function \n\
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_dl_prof_resolve: \n\
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# We need to save the registers used to pass parameters, and register 0,\n\
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# which is used by _mcount; the registers are saved in a stack frame.\n\
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stwu 1,-64(1) \n\
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stw 0,12(1) \n\
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stw 3,16(1) \n\
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stw 4,20(1) \n\
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# The code that calls this has put parameters for `fixup' in r12 and r11.\n\
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mr 3,12 \n\
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stw 5,24(1) \n\
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mr 4,11 \n\
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stw 6,28(1) \n\
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mflr 5 \n\
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# We also need to save some of the condition register fields.\n\
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stw 7,32(1) \n\
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stw 5,48(1) \n\
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stw 8,36(1) \n\
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mfcr 0 \n\
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stw 9,40(1) \n\
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stw 10,44(1) \n\
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stw 0,8(1) \n\
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bl profile_fixup@local \n\
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# 'fixup' returns the address we want to branch to.\n\
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mtctr 3 \n\
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# Put the registers back...\n\
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lwz 0,48(1) \n\
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lwz 10,44(1) \n\
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lwz 9,40(1) \n\
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mtlr 0 \n\
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lwz 8,36(1) \n\
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lwz 0,8(1) \n\
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lwz 7,32(1) \n\
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lwz 6,28(1) \n\
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mtcrf 0xFF,0 \n\
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lwz 5,24(1) \n\
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lwz 4,20(1) \n\
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lwz 3,16(1) \n\
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lwz 0,12(1) \n\
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# ...unwind the stack frame, and jump to the PLT entry we updated.\n\
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addi 1,1,64 \n\
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bctr \n\
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.size _dl_prof_resolve,.-_dl_prof_resolve \n\
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# Undo '.section text'.\n\
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.previous \n\
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");
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#else
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# define ELF_MACHINE_RUNTIME_TRAMPOLINE asm ("\n\
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.section \".text\" \n\
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.align 2 \n\
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.globl _dl_runtime_resolve \n\
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.globl _dl_prof_resolve \n\
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.type _dl_runtime_resolve,@function \n\
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.type _dl_prof_resolve,@function \n\
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_dl_runtime_resolve: \n\
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_dl_prof_resolve: \n\
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# We need to save the registers used to pass parameters, and register 0,\n\
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# which is used by _mcount; the registers are saved in a stack frame.\n\
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stwu 1,-64(1) \n\
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stw 0,12(1) \n\
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stw 3,16(1) \n\
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stw 4,20(1) \n\
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# The code that calls this has put parameters for `fixup' in r12 and r11.\n\
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mr 3,12 \n\
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stw 5,24(1) \n\
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mr 4,11 \n\
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stw 6,28(1) \n\
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mflr 0 \n\
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# We also need to save some of the condition register fields.\n\
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stw 7,32(1) \n\
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stw 0,48(1) \n\
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stw 8,36(1) \n\
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mfcr 0 \n\
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stw 9,40(1) \n\
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stw 10,44(1) \n\
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stw 0,8(1) \n\
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bl fixup@local \n\
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# 'fixup' returns the address we want to branch to.\n\
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mtctr 3 \n\
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# Put the registers back...\n\
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lwz 0,48(1) \n\
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lwz 10,44(1) \n\
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lwz 9,40(1) \n\
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mtlr 0 \n\
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lwz 8,36(1) \n\
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lwz 0,8(1) \n\
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lwz 7,32(1) \n\
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lwz 6,28(1) \n\
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mtcrf 0xFF,0 \n\
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lwz 5,24(1) \n\
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lwz 4,20(1) \n\
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lwz 3,16(1) \n\
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lwz 0,12(1) \n\
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# ...unwind the stack frame, and jump to the PLT entry we updated.\n\
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addi 1,1,64 \n\
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bctr \n\
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.size _dl_runtime_resolve,.-_dl_runtime_resolve \n\
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");
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#endif
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/* The actual _start code is in dl-start.S. Use a really
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ugly bit of assembler to let dl-start.o see _dl_start. */
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#define RTLD_START asm (".globl _dl_start");
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/* Decide where a relocatable object should be loaded. */
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extern ElfW(Addr)
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__elf_preferred_address(struct link_map *loader, size_t maplength,
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ElfW(Addr) mapstartpref);
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#define ELF_PREFERRED_ADDRESS(loader, maplength, mapstartpref) \
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__elf_preferred_address (loader, maplength, mapstartpref)
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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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/* We never want to use a PLT entry as the destination of a
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reloc, when what is being relocated is a branch. This is
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partly for efficiency, but mostly so we avoid loops. */
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#define elf_machine_type_class(type) \
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((((type) == R_PPC_JMP_SLOT \
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|| (type) == R_PPC_REL24 \
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|| (type) == R_PPC_ADDR24) * ELF_RTYPE_CLASS_PLT) \
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| (((type) == R_PPC_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_PPC_JMP_SLOT
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/* The PowerPC never uses REL relocations. */
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#define ELF_MACHINE_NO_REL 1
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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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Also install a small trampoline to be used by entries that have
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been relocated to an address too far away for a single branch. */
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extern int __elf_machine_runtime_setup (struct link_map *map,
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int lazy, int profile);
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#define elf_machine_runtime_setup __elf_machine_runtime_setup
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static inline void
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elf_machine_lazy_rel (struct link_map *map,
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Elf32_Addr l_addr, const Elf32_Rela *reloc)
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{
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/* elf_machine_runtime_setup handles this. */
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}
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/* Change the PLT entry whose reloc is 'reloc' to call the actual routine. */
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extern Elf32_Addr __elf_machine_fixup_plt (struct link_map *map,
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const Elf32_Rela *reloc,
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Elf32_Addr *reloc_addr,
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Elf32_Addr finaladdr);
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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_Rela *reloc,
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Elf32_Addr *reloc_addr, Elf64_Addr finaladdr)
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{
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return __elf_machine_fixup_plt (map, reloc, reloc_addr, finaladdr);
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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_Rela *reloc,
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Elf32_Addr value)
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{
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return value + reloc->r_addend;
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}
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#endif /* dl_machine_h */
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#ifdef RESOLVE
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/* Do the actual processing of a reloc, once its target address
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has been determined. */
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extern void __process_machine_rela (struct link_map *map,
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const Elf32_Rela *reloc,
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const Elf32_Sym *sym,
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const Elf32_Sym *refsym,
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Elf32_Addr *const reloc_addr,
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Elf32_Addr finaladdr,
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int rinfo);
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/* Perform the relocation specified by RELOC and SYM (which is fully resolved).
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LOADADDR is the load address of the object; INFO is an array indexed
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by DT_* of the .dynamic section info. */
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inline void
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elf_machine_rela (struct link_map *map, const Elf32_Rela *reloc,
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const Elf32_Sym *sym, const struct r_found_version *version,
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Elf32_Addr *const reloc_addr)
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{
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const Elf32_Sym *const refsym = sym;
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Elf32_Word loadbase, finaladdr;
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const int rinfo = ELF32_R_TYPE (reloc->r_info);
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#ifndef RESOLVE_CONFLICT_FIND_MAP
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if (__builtin_expect (rinfo == R_PPC_NONE, 0))
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return;
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/* The condition on the next two lines is a hack around a bug in Solaris
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|
tools on Sparc. It's not clear whether it should really be here at all,
|
|
but if not the binutils need to be changed. */
|
|
if (rinfo == R_PPC_RELATIVE
|
|
|| (sym->st_shndx != SHN_UNDEF
|
|
&& ELF32_ST_BIND (sym->st_info) == STB_LOCAL))
|
|
{
|
|
/* Has already been relocated. */
|
|
loadbase = map->l_addr;
|
|
finaladdr = loadbase + reloc->r_addend;
|
|
}
|
|
else
|
|
{
|
|
loadbase = (Elf32_Word) (char *) (RESOLVE (&sym, version,
|
|
ELF32_R_TYPE(reloc->r_info)));
|
|
if (sym == NULL)
|
|
{
|
|
/* Weak symbol that wasn't actually defined anywhere. */
|
|
assert(loadbase == 0);
|
|
finaladdr = reloc->r_addend;
|
|
}
|
|
else
|
|
finaladdr = (loadbase + (Elf32_Word) (char *) sym->st_value
|
|
+ reloc->r_addend);
|
|
}
|
|
#else
|
|
finaladdr = reloc->r_addend;
|
|
if (rinfo == R_PPC_JMP_SLOT)
|
|
RESOLVE_CONFLICT_FIND_MAP (map, reloc_addr);
|
|
#endif
|
|
|
|
/* A small amount of code is duplicated here for speed. In libc,
|
|
more than 90% of the relocs are R_PPC_RELATIVE; in the X11 shared
|
|
libraries, 60% are R_PPC_RELATIVE, 24% are R_PPC_GLOB_DAT or
|
|
R_PPC_ADDR32, and 16% are R_PPC_JMP_SLOT (which this routine
|
|
wouldn't usually handle). As an bonus, doing this here allows
|
|
the switch statement in __process_machine_rela to work. */
|
|
if (rinfo == R_PPC_RELATIVE
|
|
|| rinfo == R_PPC_GLOB_DAT
|
|
|| rinfo == R_PPC_ADDR32)
|
|
{
|
|
*reloc_addr = finaladdr;
|
|
}
|
|
else
|
|
__process_machine_rela (map, reloc, sym, refsym,
|
|
reloc_addr, finaladdr, rinfo);
|
|
}
|
|
|
|
static inline void
|
|
elf_machine_rela_relative (Elf32_Addr l_addr, const Elf32_Rela *reloc,
|
|
Elf32_Addr *const reloc_addr)
|
|
{
|
|
*reloc_addr = l_addr + reloc->r_addend;
|
|
}
|
|
|
|
/* The SVR4 ABI specifies that the JMPREL relocs must be inside the
|
|
DT_RELA table. */
|
|
#define ELF_MACHINE_PLTREL_OVERLAP 1
|
|
|
|
#endif /* RESOLVE */
|