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2003-07-31 Alexandre Oliva <aoliva@redhat.com> * elf/dynamic-link.h (elf_machine_rel, elf_machine_rela, elf_machine_rel_relative, elf_machine_rela_relative): Don't assume reloc_addr is aligned. * sysdeps/alpha/dl-machine.h (elf_machine_rela, elf_machine_rela_relative): Adjust. * sysdeps/arm/dl-machine.h (elf_machine_rel, elf_machine_rela, elf_machine_rel_relative, elf_machine_rela_relative): Adjust. * sysdeps/cris/dl-machine.h (elf_machine_rela, elf_machine_rela_relative): Adjust. * sysdeps/hppa/dl-machine.h (elf_machine_rela, elf_machine_rela_relative): Adjust. * sysdeps/i386/dl-machine.h (elf_machine_rel, elf_machine_rela, elf_machine_rel_relative, elf_machine_rela_relative): Adjust. * sysdeps/ia64/dl-machine.h (elf_machine_rela, elf_machine_rela_relative): Adjust. * sysdeps/m68k/dl-machine.h (elf_machine_rela, elf_machine_rela_relative): Adjust. * sysdeps/mips/dl-machine.h (elf_machine_rela, elf_machine_rela_relative): Adjust. * sysdeps/powerpc/powerpc32/dl-machine.h (elf_machine_rela, elf_machine_rela_relative): Adjust. * sysdeps/powerpc/powerpc64/dl-machine.h (elf_machine_rela_relative, elf_machine_rela): Adjust. * sysdeps/s390/s390-32/dl-machine.h (elf_machine_rela, elf_machine_rela_relative): Adjust. * sysdeps/s390/s390-64/dl-machine.h (elf_machine_rela, elf_machine_rela_relative): * sysdeps/sh/dl-machine.h (elf_machine_rela, elf_machine_rela_relative): Adjust. * sysdeps/sparc/sparc32/dl-machine.h (elf_machine_rela, elf_machine_rela_relative): Adjust. * sysdeps/sparc/sparc64/dl-machine.h (elf_machine_rela, elf_machine_rela_relative): Adjust. * sysdeps/x86_64/dl-machine.h (elf_machine_rela, elf_machine_rela_relative): Adjust.
889 lines
29 KiB
C
889 lines
29 KiB
C
/* Machine-dependent ELF dynamic relocation inline functions.
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PowerPC64 version.
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Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003
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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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 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 "powerpc64"
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#include <assert.h>
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#include <sys/param.h>
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#include <dl-tls.h>
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/* Translate a processor specific dynamic tag to the index
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in l_info array. */
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#define DT_PPC64(x) (DT_PPC64_##x - DT_LOPROC + DT_NUM)
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/* A PowerPC64 function descriptor. The .plt (procedure linkage
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table) and .opd (official procedure descriptor) sections are
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arrays of these. */
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typedef struct
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{
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Elf64_Addr fd_func;
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Elf64_Addr fd_toc;
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Elf64_Addr fd_aux;
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} Elf64_FuncDesc;
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#define ELF_MULT_MACHINES_SUPPORTED
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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 Elf64_Ehdr *ehdr)
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{
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return ehdr->e_machine == EM_PPC64;
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}
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/* Return nonzero iff ELF header is compatible with the running host,
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but not this loader. */
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static inline int
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elf_host_tolerates_machine (const Elf64_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 nonzero iff ELF header is compatible with the running host,
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but not this loader. */
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static inline int
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elf_host_tolerates_class (const Elf64_Ehdr *ehdr)
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{
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return ehdr->e_ident[EI_CLASS] == ELFCLASS32;
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}
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/* Return the run-time load address of the shared object, assuming it
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was originally linked at zero. */
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static inline Elf64_Addr
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elf_machine_load_address (void) __attribute__ ((const));
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static inline Elf64_Addr
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elf_machine_load_address (void)
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{
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Elf64_Addr ret;
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/* The first entry in .got (and thus the first entry in .toc) is the
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link-time TOC_base, ie. r2. So the difference between that and
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the current r2 set by the kernel is how far the shared lib has
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moved. */
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asm ( " ld %0,-32768(2)\n"
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" subf %0,%0,2\n"
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: "=r" (ret));
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return ret;
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}
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/* Return the link-time address of _DYNAMIC. */
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static inline Elf64_Addr
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elf_machine_dynamic (void)
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{
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Elf64_Addr runtime_dynamic;
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/* It's easier to get the run-time address. */
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asm ( " addis %0,2,_DYNAMIC@toc@ha\n"
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" addi %0,%0,_DYNAMIC@toc@l\n"
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: "=b" (runtime_dynamic));
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/* Then subtract off the load address offset. */
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return runtime_dynamic - elf_machine_load_address() ;
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}
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#define ELF_MACHINE_BEFORE_RTLD_RELOC(dynamic_info) /* nothing */
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/* The PLT uses Elf64_Rela relocs. */
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#define elf_machine_relplt elf_machine_rela
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/* This code gets called via a .glink stub which loads PLT0. It is
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used in dl-runtime.c to call the `fixup' function and then redirect
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to the address `fixup' returns.
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Enter with r0 = plt reloc index,
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r2 = ld.so tocbase,
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r11 = ld.so link map. */
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#define TRAMPOLINE_TEMPLATE(tramp_name, fixup_name) \
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asm (".section \".text\"\n" \
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" .align 2\n" \
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" .globl ." #tramp_name "\n" \
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" .type ." #tramp_name ",@function\n" \
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" .section \".opd\",\"aw\"\n" \
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" .align 3\n" \
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" .globl " #tramp_name "\n" \
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" .size " #tramp_name ",24\n" \
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#tramp_name ":\n" \
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" .quad ." #tramp_name ",.TOC.@tocbase,0\n" \
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" .previous\n" \
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"." #tramp_name ":\n" \
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/* We need to save the registers used to pass parameters, ie. r3 thru \
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r10; the registers are saved in a stack frame. */ \
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" stdu 1,-128(1)\n" \
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" std 3,48(1)\n" \
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" mr 3,11\n" \
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" std 4,56(1)\n" \
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" sldi 4,0,1\n" \
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" std 5,64(1)\n" \
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" add 4,4,0\n" \
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" std 6,72(1)\n" \
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" sldi 4,4,3\n" \
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" std 7,80(1)\n" \
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" mflr 0\n" \
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" std 8,88(1)\n" \
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/* Store the LR in the LR Save area of the previous frame. */ \
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" std 0,128+16(1)\n" \
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" mfcr 0\n" \
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" std 9,96(1)\n" \
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" std 10,104(1)\n" \
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/* I'm almost certain we don't have to save cr... be safe. */ \
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" std 0,8(1)\n" \
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" bl ." #fixup_name "\n" \
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/* Put the registers back. */ \
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" ld 0,128+16(1)\n" \
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" ld 10,104(1)\n" \
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" ld 9,96(1)\n" \
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" ld 8,88(1)\n" \
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" ld 7,80(1)\n" \
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" mtlr 0\n" \
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" ld 0,8(1)\n" \
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" ld 6,72(1)\n" \
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" ld 5,64(1)\n" \
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" ld 4,56(1)\n" \
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" mtcrf 0xFF,0\n" \
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/* Load the target address, toc and static chain reg from the function \
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descriptor returned by fixup. */ \
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" ld 0,0(3)\n" \
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" ld 2,8(3)\n" \
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" mtctr 0\n" \
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" ld 11,16(3)\n" \
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" ld 3,48(1)\n" \
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/* Unwind the stack frame, and jump. */ \
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" addi 1,1,128\n" \
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" bctr\n" \
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".LT_" #tramp_name ":\n" \
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" .long 0\n" \
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" .byte 0x00,0x0c,0x24,0x40,0x00,0x00,0x00,0x00\n" \
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" .long .LT_" #tramp_name "-."#tramp_name "\n" \
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" .short .LT_" #tramp_name "_name_end-.LT_" #tramp_name "_name_start\n" \
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".LT_" #tramp_name "_name_start:\n" \
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" .ascii \"" #tramp_name "\"\n" \
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".LT_" #tramp_name "_name_end:\n" \
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" .align 2\n" \
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" .size ." #tramp_name ",. - ." #tramp_name "\n" \
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" .previous");
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#ifndef PROF
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#define ELF_MACHINE_RUNTIME_TRAMPOLINE \
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TRAMPOLINE_TEMPLATE (_dl_runtime_resolve, fixup); \
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TRAMPOLINE_TEMPLATE (_dl_profile_resolve, profile_fixup);
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#else
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#define ELF_MACHINE_RUNTIME_TRAMPOLINE \
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TRAMPOLINE_TEMPLATE (_dl_runtime_resolve, fixup); \
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void _dl_runtime_resolve (void); \
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strong_alias (_dl_runtime_resolve, _dl_profile_resolve);
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#endif
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/* Initial entry point code for the dynamic linker. The C function
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`_dl_start' is the real entry point; its return value is the user
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program's entry point. */
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#define RTLD_START \
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asm (".section \".text\"\n" \
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" .align 2\n" \
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" .globl ._start\n" \
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" .type ._start,@function\n" \
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" .section \".opd\",\"aw\"\n" \
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" .align 3\n" \
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" .globl _start\n" \
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" .size _start,24\n" \
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"_start:\n" \
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" .quad ._start,.TOC.@tocbase,0\n" \
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" .previous\n" \
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"._start:\n" \
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/* We start with the following on the stack, from top: \
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argc (4 bytes); \
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arguments for program (terminated by NULL); \
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environment variables (terminated by NULL); \
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arguments for the program loader. */ \
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" mr 3,1\n" \
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" li 4,0\n" \
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" stdu 4,-128(1)\n" \
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/* Call _dl_start with one parameter pointing at argc. */ \
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" bl ._dl_start\n" \
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" nop\n" \
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/* Transfer control to _dl_start_user! */ \
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" b ._dl_start_user\n" \
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".LT__start:\n" \
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" .long 0\n" \
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" .byte 0x00,0x0c,0x24,0x40,0x00,0x00,0x00,0x00\n" \
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" .long .LT__start-._start\n" \
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" .short .LT__start_name_end-.LT__start_name_start\n" \
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".LT__start_name_start:\n" \
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" .ascii \"_start\"\n" \
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".LT__start_name_end:\n" \
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" .align 2\n" \
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" .size ._start,.-._start\n" \
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" .globl _dl_start_user\n" \
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" .section \".opd\",\"aw\"\n" \
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"_dl_start_user:\n" \
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" .quad ._dl_start_user, .TOC.@tocbase, 0\n" \
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" .previous\n" \
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" .section \".toc\",\"aw\"\n" \
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".LC__dl_starting_up:\n" \
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" .tc _dl_starting_up_internal[TC],_dl_starting_up_internal\n" \
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".LC__rtld_global:\n" \
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" .tc _rtld_global[TC],_rtld_global\n" \
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".LC__dl_argc:\n" \
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" .tc _dl_argc[TC],_dl_argc\n" \
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".LC__dl_argv:\n" \
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" .tc _dl_argv_internal[TC],_dl_argv_internal\n" \
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".LC__dl_fini:\n" \
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" .tc _dl_fini[TC],_dl_fini\n" \
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" .previous\n" \
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" .globl ._dl_start_user\n" \
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" .type ._dl_start_user,@function\n" \
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/* Now, we do our main work of calling initialisation procedures. \
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The ELF ABI doesn't say anything about parameters for these, \
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so we just pass argc, argv, and the environment. \
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Changing these is strongly discouraged (not least because argc is \
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passed by value!). */ \
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"._dl_start_user:\n" \
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/* the address of _start in r30. */ \
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" mr 30,3\n" \
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/* &_dl_argc in 29, &_dl_argv in 27, and _dl_loaded in 28. */ \
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" ld 28,.LC__rtld_global@toc(2)\n" \
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" ld 29,.LC__dl_argc@toc(2)\n" \
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" ld 27,.LC__dl_argv@toc(2)\n" \
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/* _dl_init (_dl_loaded, _dl_argc, _dl_argv, _dl_argv+_dl_argc+1). */ \
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" ld 3,0(28)\n" \
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" lwa 4,0(29)\n" \
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" ld 5,0(27)\n" \
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" sldi 6,4,3\n" \
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" add 6,5,6\n" \
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" addi 6,6,8\n" \
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" bl ._dl_init\n" \
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" nop\n" \
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/* Now, to conform to the ELF ABI, we have to: \
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Pass argc (actually _dl_argc) in r3; */ \
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" lwa 3,0(29)\n" \
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/* Pass argv (actually _dl_argv) in r4; */ \
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" ld 4,0(27)\n" \
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/* Pass argv+argc+1 in r5; */ \
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" sldi 5,3,3\n" \
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" add 6,4,5\n" \
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" addi 5,6,8\n" \
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/* Pass the auxilary vector in r6. This is passed to us just after \
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_envp. */ \
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"2: ldu 0,8(6)\n" \
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" cmpdi 0,0\n" \
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" bne 2b\n" \
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" addi 6,6,8\n" \
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/* Pass a termination function pointer (in this case _dl_fini) in \
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r7. */ \
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" ld 7,.LC__dl_fini@toc(2)\n" \
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" ld 26,.LC__dl_starting_up@toc(2)\n" \
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/* Pass the stack pointer in r1 (so far so good), pointing to a NULL \
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value. This lets our startup code distinguish between a program \
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linked statically, which linux will call with argc on top of the \
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stack which will hopefully never be zero, and a dynamically linked \
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program which will always have a NULL on the top of the stack. \
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Take the opportunity to clear LR, so anyone who accidentally \
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returns from _start gets SEGV. Also clear the next few words of \
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the stack. */ \
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" li 31,0\n" \
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" std 31,0(1)\n" \
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" mtlr 31\n" \
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" std 31,8(1)\n" \
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" std 31,16(1)\n" \
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" std 31,24(1)\n" \
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/* Clear _dl_starting_up. */ \
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" stw 31,0(26)\n" \
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/* Now, call the start function descriptor at r30... */ \
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" .globl ._dl_main_dispatch\n" \
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"._dl_main_dispatch:\n" \
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" ld 0,0(30)\n" \
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" ld 2,8(30)\n" \
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" mtctr 0\n" \
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" ld 11,16(30)\n" \
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" bctr\n" \
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".LT__dl_start_user:\n" \
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" .long 0\n" \
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" .byte 0x00,0x0c,0x24,0x40,0x00,0x00,0x00,0x00\n" \
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" .long .LT__dl_start_user-._dl_start_user\n" \
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" .short .LT__dl_start_user_name_end-.LT__dl_start_user_name_start\n" \
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".LT__dl_start_user_name_start:\n" \
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" .ascii \"_dl_start_user\"\n" \
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".LT__dl_start_user_name_end:\n" \
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" .align 2\n" \
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" .size ._dl_start_user,.-._dl_start_user\n" \
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" .previous");
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/* Nonzero iff TYPE should not be allowed to resolve to one of
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the main executable's symbols, as for a COPY reloc. */
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#define elf_machine_lookup_noexec_p(type) ((type) == R_PPC64_COPY)
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/* Nonzero 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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#define elf_machine_lookup_noplt_p(type) ((type) == R_PPC64_JMP_SLOT)
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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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#if defined USE_TLS && (!defined RTLD_BOOTSTRAP || USE___THREAD)
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#define elf_machine_type_class(type) \
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/* This covers all the TLS relocs, though most won't appear. */ \
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(((((type) >= R_PPC64_DTPMOD64 && (type) <= R_PPC64_TPREL16_HIGHESTA) \
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|| (type) == R_PPC64_ADDR24) * ELF_RTYPE_CLASS_PLT) \
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| (((type) == R_PPC64_COPY) * ELF_RTYPE_CLASS_COPY))
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#else
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#define elf_machine_type_class(type) \
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((((type) == R_PPC64_ADDR24) * ELF_RTYPE_CLASS_PLT) \
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| (((type) == R_PPC64_COPY) * ELF_RTYPE_CLASS_COPY))
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#endif
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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_PPC64_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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/* Stuff for the PLT. */
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#define PLT_INITIAL_ENTRY_WORDS 3
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#define GLINK_INITIAL_ENTRY_WORDS 8
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#define PPC_DCBST(where) asm volatile ("dcbst 0,%0" : : "r"(where) : "memory")
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#define PPC_SYNC asm volatile ("sync" : : : "memory")
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#define PPC_ISYNC asm volatile ("sync; isync" : : : "memory")
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#define PPC_ICBI(where) asm volatile ("icbi 0,%0" : : "r"(where) : "memory")
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#define PPC_DIE asm volatile ("tweq 0,0")
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/* Use this when you've modified some code, but it won't be in the
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instruction fetch queue (or when it doesn't matter if it is). */
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#define MODIFIED_CODE_NOQUEUE(where) \
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do { PPC_DCBST(where); PPC_SYNC; PPC_ICBI(where); } while (0)
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/* Use this when it might be in the instruction queue. */
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#define MODIFIED_CODE(where) \
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do { PPC_DCBST(where); PPC_SYNC; PPC_ICBI(where); PPC_ISYNC; } while (0)
|
|
|
|
/* Set up the loaded object described by MAP so its unrelocated PLT
|
|
entries will jump to the on-demand fixup code in dl-runtime.c. */
|
|
static inline int
|
|
elf_machine_runtime_setup (struct link_map *map, int lazy, int profile)
|
|
{
|
|
if (map->l_info[DT_JMPREL])
|
|
{
|
|
Elf64_Word i;
|
|
Elf64_Word *glink = NULL;
|
|
Elf64_Xword *plt = (Elf64_Xword *) D_PTR (map, l_info[DT_PLTGOT]);
|
|
Elf64_Word num_plt_entries = (map->l_info[DT_PLTRELSZ]->d_un.d_val
|
|
/ sizeof (Elf64_Rela));
|
|
Elf64_Addr l_addr = map->l_addr;
|
|
Elf64_Dyn **info = map->l_info;
|
|
char *p;
|
|
|
|
extern void _dl_runtime_resolve (void);
|
|
extern void _dl_profile_resolve (void);
|
|
|
|
/* Relocate the DT_PPC64_GLINK entry in the _DYNAMIC section.
|
|
elf_get_dynamic_info takes care of the standard entries but
|
|
doesn't know exactly what to do with processor specific
|
|
entires. */
|
|
if (info[DT_PPC64(GLINK)] != NULL)
|
|
info[DT_PPC64(GLINK)]->d_un.d_ptr += l_addr;
|
|
|
|
if (lazy)
|
|
{
|
|
/* The function descriptor of the appropriate trampline
|
|
routine is used to set the 1st and 2nd doubleword of the
|
|
plt_reserve. */
|
|
Elf64_FuncDesc *resolve_fd;
|
|
Elf64_Word glink_offset;
|
|
/* the plt_reserve area is the 1st 3 doublewords of the PLT */
|
|
Elf64_FuncDesc *plt_reserve = (Elf64_FuncDesc *) plt;
|
|
Elf64_Word offset;
|
|
|
|
resolve_fd = (Elf64_FuncDesc *) (profile ? _dl_profile_resolve
|
|
: _dl_runtime_resolve);
|
|
if (profile && _dl_name_match_p (GL(dl_profile), map))
|
|
/* This is the object we are looking for. Say that we really
|
|
want profiling and the timers are started. */
|
|
GL(dl_profile_map) = map;
|
|
|
|
|
|
/* We need to stuff the address/TOC of _dl_runtime_resolve
|
|
into doublewords 0 and 1 of plt_reserve. Then we need to
|
|
stuff the map address into doubleword 2 of plt_reserve.
|
|
This allows the GLINK0 code to transfer control to the
|
|
correct trampoline which will transfer control to fixup
|
|
in dl-machine.c. */
|
|
plt_reserve->fd_func = resolve_fd->fd_func;
|
|
plt_reserve->fd_toc = resolve_fd->fd_toc;
|
|
plt_reserve->fd_aux = (Elf64_Addr) map;
|
|
#ifdef RTLD_BOOTSTRAP
|
|
/* When we're bootstrapping, the opd entry will not have
|
|
been relocated yet. */
|
|
plt_reserve->fd_func += l_addr;
|
|
plt_reserve->fd_toc += l_addr;
|
|
#endif
|
|
|
|
/* Set up the lazy PLT entries. */
|
|
glink = (Elf64_Word *) D_PTR (map, l_info[DT_PPC64(GLINK)]);
|
|
offset = PLT_INITIAL_ENTRY_WORDS;
|
|
glink_offset = GLINK_INITIAL_ENTRY_WORDS;
|
|
for (i = 0; i < num_plt_entries; i++)
|
|
{
|
|
|
|
plt[offset] = (Elf64_Xword) &glink[glink_offset];
|
|
offset += 3;
|
|
/* The first 32k entries of glink can set an index and
|
|
branch using two instructions; Past that point,
|
|
glink uses three instructions. */
|
|
if (i < 0x8000)
|
|
glink_offset += 2;
|
|
else
|
|
glink_offset += 3;
|
|
}
|
|
|
|
/* Now, we've modified data. We need to write the changes from
|
|
the data cache to a second-level unified cache, then make
|
|
sure that stale data in the instruction cache is removed.
|
|
(In a multiprocessor system, the effect is more complex.)
|
|
Most of the PLT shouldn't be in the instruction cache, but
|
|
there may be a little overlap at the start and the end.
|
|
|
|
Assumes that dcbst and icbi apply to lines of 16 bytes or
|
|
more. Current known line sizes are 16, 32, and 128 bytes. */
|
|
|
|
for (p = (char *) plt; p < (char *) &plt[offset]; p += 16)
|
|
PPC_DCBST (p);
|
|
PPC_SYNC;
|
|
}
|
|
}
|
|
return lazy;
|
|
}
|
|
|
|
/* Change the PLT entry whose reloc is 'reloc' to call the actual
|
|
routine. */
|
|
static inline Elf64_Addr
|
|
elf_machine_fixup_plt (struct link_map *map, lookup_t sym_map,
|
|
const Elf64_Rela *reloc,
|
|
Elf64_Addr *reloc_addr, Elf64_Addr finaladdr)
|
|
{
|
|
Elf64_FuncDesc *plt = (Elf64_FuncDesc *) reloc_addr;
|
|
Elf64_FuncDesc *rel = (Elf64_FuncDesc *) finaladdr;
|
|
Elf64_Addr offset = 0;
|
|
|
|
/* If sym_map is NULL, it's a weak undefined sym; Leave the plt zero. */
|
|
if (sym_map == NULL)
|
|
return 0;
|
|
|
|
/* If the opd entry is not yet relocated (because it's from a shared
|
|
object that hasn't been processed yet), then manually reloc it. */
|
|
if (map != sym_map && !sym_map->l_relocated
|
|
#if !defined RTLD_BOOTSTRAP && defined SHARED
|
|
/* Bootstrap map doesn't have l_relocated set for it. */
|
|
&& sym_map != &GL(dl_rtld_map)
|
|
#endif
|
|
)
|
|
offset = sym_map->l_addr;
|
|
|
|
/* For PPC64, fixup_plt copies the function descriptor from opd
|
|
over the corresponding PLT entry.
|
|
Initially, PLT Entry[i] is set up for lazy linking, or is zero.
|
|
For lazy linking, the fd_toc and fd_aux entries are irrelevant,
|
|
so for thread safety we write them before changing fd_func. */
|
|
|
|
plt->fd_aux = rel->fd_aux + offset;
|
|
plt->fd_toc = rel->fd_toc + offset;
|
|
PPC_DCBST (&plt->fd_aux);
|
|
PPC_DCBST (&plt->fd_toc);
|
|
PPC_SYNC;
|
|
|
|
plt->fd_func = rel->fd_func + offset;
|
|
PPC_DCBST (&plt->fd_func);
|
|
PPC_SYNC;
|
|
|
|
return finaladdr;
|
|
}
|
|
|
|
static inline void
|
|
elf_machine_plt_conflict (Elf64_Addr *reloc_addr, Elf64_Addr finaladdr)
|
|
{
|
|
Elf64_FuncDesc *plt = (Elf64_FuncDesc *) reloc_addr;
|
|
Elf64_FuncDesc *rel = (Elf64_FuncDesc *) finaladdr;
|
|
|
|
plt->fd_func = rel->fd_func;
|
|
plt->fd_aux = rel->fd_aux;
|
|
plt->fd_toc = rel->fd_toc;
|
|
PPC_DCBST (&plt->fd_func);
|
|
PPC_DCBST (&plt->fd_aux);
|
|
PPC_DCBST (&plt->fd_toc);
|
|
PPC_SYNC;
|
|
}
|
|
|
|
/* Return the final value of a plt relocation. */
|
|
static inline Elf64_Addr
|
|
elf_machine_plt_value (struct link_map *map, const Elf64_Rela *reloc,
|
|
Elf64_Addr value)
|
|
{
|
|
return value + reloc->r_addend;
|
|
}
|
|
|
|
#endif /* dl_machine_h */
|
|
|
|
#ifdef RESOLVE_MAP
|
|
|
|
#define PPC_LO(v) ((v) & 0xffff)
|
|
#define PPC_HI(v) (((v) >> 16) & 0xffff)
|
|
#define PPC_HA(v) PPC_HI ((v) + 0x8000)
|
|
#define PPC_HIGHER(v) (((v) >> 32) & 0xffff)
|
|
#define PPC_HIGHERA(v) PPC_HIGHER ((v) + 0x8000)
|
|
#define PPC_HIGHEST(v) (((v) >> 48) & 0xffff)
|
|
#define PPC_HIGHESTA(v) PPC_HIGHEST ((v) + 0x8000)
|
|
#define BIT_INSERT(var, val, mask) \
|
|
((var) = ((var) & ~(Elf64_Addr) (mask)) | ((val) & (mask)))
|
|
|
|
#define dont_expect(X) __builtin_expect ((X), 0)
|
|
|
|
extern void _dl_reloc_overflow (struct link_map *map,
|
|
const char *name,
|
|
Elf64_Addr *const reloc_addr,
|
|
const Elf64_Sym *refsym)
|
|
attribute_hidden;
|
|
|
|
static inline void
|
|
elf_machine_rela_relative (Elf64_Addr l_addr, const Elf64_Rela *reloc,
|
|
void *const reloc_addr_arg)
|
|
{
|
|
Elf64_Addr *const reloc_addr = reloc_addr_arg;
|
|
*reloc_addr = l_addr + reloc->r_addend;
|
|
}
|
|
|
|
#if defined USE_TLS && (!defined RTLD_BOOTSTRAP || USE___THREAD)
|
|
/* This computes the value used by TPREL* relocs. */
|
|
static Elf64_Addr __attribute__ ((const))
|
|
elf_machine_tprel (struct link_map *map,
|
|
struct link_map *sym_map,
|
|
const Elf64_Sym *sym,
|
|
const Elf64_Rela *reloc)
|
|
{
|
|
# ifndef RTLD_BOOTSTRAP
|
|
if (sym_map)
|
|
{
|
|
CHECK_STATIC_TLS (map, sym_map);
|
|
# endif
|
|
return TLS_TPREL_VALUE (sym_map, sym, reloc);
|
|
# ifndef RTLD_BOOTSTRAP
|
|
}
|
|
# endif
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/* Perform the relocation specified by RELOC and SYM (which is fully
|
|
resolved). MAP is the object containing the reloc. */
|
|
static inline void
|
|
elf_machine_rela (struct link_map *map,
|
|
const Elf64_Rela *reloc,
|
|
const Elf64_Sym *sym,
|
|
const struct r_found_version *version,
|
|
void *const reloc_addr_arg)
|
|
{
|
|
Elf64_Addr *const reloc_addr = reloc_addr_arg;
|
|
const int r_type = ELF64_R_TYPE (reloc->r_info);
|
|
#ifndef RTLD_BOOTSTRAP
|
|
const Elf64_Sym *const refsym = sym;
|
|
#endif
|
|
|
|
if (r_type == R_PPC64_RELATIVE)
|
|
{
|
|
*reloc_addr = map->l_addr + reloc->r_addend;
|
|
return;
|
|
}
|
|
|
|
if (__builtin_expect (r_type == R_PPC64_NONE, 0))
|
|
return;
|
|
|
|
/* We need SYM_MAP even in the absence of TLS, for elf_machine_fixup_plt. */
|
|
struct link_map *sym_map = RESOLVE_MAP (&sym, version, r_type);
|
|
Elf64_Addr value = ((sym_map == NULL ? 0 : sym_map->l_addr + sym->st_value)
|
|
+ reloc->r_addend);
|
|
|
|
/* For relocs that don't edit code, return.
|
|
For relocs that might edit instructions, break from the switch. */
|
|
switch (r_type)
|
|
{
|
|
case R_PPC64_ADDR64:
|
|
case R_PPC64_GLOB_DAT:
|
|
*reloc_addr = value;
|
|
return;
|
|
|
|
case R_PPC64_JMP_SLOT:
|
|
#ifdef RESOLVE_CONFLICT_FIND_MAP
|
|
elf_machine_plt_conflict (reloc_addr, value);
|
|
#else
|
|
elf_machine_fixup_plt (map, sym_map, reloc, reloc_addr, value);
|
|
#endif
|
|
return;
|
|
|
|
#if defined USE_TLS && (!defined RTLD_BOOTSTRAP || USE___THREAD)
|
|
case R_PPC64_DTPMOD64:
|
|
# ifdef RTLD_BOOTSTRAP
|
|
/* During startup the dynamic linker is always index 1. */
|
|
*reloc_addr = 1;
|
|
# else
|
|
/* Get the information from the link map returned by the
|
|
resolve function. */
|
|
if (sym_map != NULL)
|
|
*reloc_addr = sym_map->l_tls_modid;
|
|
# endif
|
|
return;
|
|
|
|
case R_PPC64_DTPREL64:
|
|
/* During relocation all TLS symbols are defined and used.
|
|
Therefore the offset is already correct. */
|
|
# ifndef RTLD_BOOTSTRAP
|
|
if (sym_map != NULL)
|
|
*reloc_addr = TLS_DTPREL_VALUE (sym, reloc);
|
|
# endif
|
|
return;
|
|
|
|
case R_PPC64_TPREL64:
|
|
*reloc_addr = elf_machine_tprel (map, sym_map, sym, reloc);
|
|
return;
|
|
|
|
case R_PPC64_TPREL16_LO_DS:
|
|
value = elf_machine_tprel (map, sym_map, sym, reloc);
|
|
if (dont_expect ((value & 3) != 0))
|
|
_dl_reloc_overflow (map, "R_PPC64_TPREL16_LO_DS", reloc_addr, refsym);
|
|
*(Elf64_Half *) reloc_addr = BIT_INSERT (*(Elf64_Half *) reloc_addr,
|
|
value, 0xfffc);
|
|
break;
|
|
|
|
case R_PPC64_TPREL16_DS:
|
|
value = elf_machine_tprel (map, sym_map, sym, reloc);
|
|
if (dont_expect ((value + 0x8000) >= 0x10000 || (value & 3) != 0))
|
|
_dl_reloc_overflow (map, "R_PPC64_TPREL16_DS", reloc_addr, refsym);
|
|
*(Elf64_Half *) reloc_addr = BIT_INSERT (*(Elf64_Half *) reloc_addr,
|
|
value, 0xfffc);
|
|
break;
|
|
|
|
case R_PPC64_TPREL16:
|
|
value = elf_machine_tprel (map, sym_map, sym, reloc);
|
|
if (dont_expect ((value + 0x8000) >= 0x10000))
|
|
_dl_reloc_overflow (map, "R_PPC64_TPREL16", reloc_addr, refsym);
|
|
*(Elf64_Half *) reloc_addr = PPC_LO (value);
|
|
break;
|
|
|
|
case R_PPC64_TPREL16_LO:
|
|
value = elf_machine_tprel (map, sym_map, sym, reloc);
|
|
*(Elf64_Half *) reloc_addr = PPC_LO (value);
|
|
break;
|
|
|
|
case R_PPC64_TPREL16_HI:
|
|
value = elf_machine_tprel (map, sym_map, sym, reloc);
|
|
*(Elf64_Half *) reloc_addr = PPC_HI (value);
|
|
break;
|
|
|
|
case R_PPC64_TPREL16_HA:
|
|
value = elf_machine_tprel (map, sym_map, sym, reloc);
|
|
*(Elf64_Half *) reloc_addr = PPC_HA (value);
|
|
break;
|
|
|
|
case R_PPC64_TPREL16_HIGHER:
|
|
value = elf_machine_tprel (map, sym_map, sym, reloc);
|
|
*(Elf64_Half *) reloc_addr = PPC_HIGHER (value);
|
|
break;
|
|
|
|
case R_PPC64_TPREL16_HIGHEST:
|
|
value = elf_machine_tprel (map, sym_map, sym, reloc);
|
|
*(Elf64_Half *) reloc_addr = PPC_HIGHEST (value);
|
|
break;
|
|
|
|
case R_PPC64_TPREL16_HIGHERA:
|
|
value = elf_machine_tprel (map, sym_map, sym, reloc);
|
|
*(Elf64_Half *) reloc_addr = PPC_HIGHERA (value);
|
|
break;
|
|
|
|
case R_PPC64_TPREL16_HIGHESTA:
|
|
value = elf_machine_tprel (map, sym_map, sym, reloc);
|
|
*(Elf64_Half *) reloc_addr = PPC_HIGHESTA (value);
|
|
break;
|
|
#endif /* USE_TLS etc. */
|
|
|
|
#ifndef RTLD_BOOTSTRAP /* None of the following appear in ld.so */
|
|
case R_PPC64_ADDR16_LO_DS:
|
|
if (dont_expect ((value & 3) != 0))
|
|
_dl_reloc_overflow (map, "R_PPC64_ADDR16_LO_DS", reloc_addr, refsym);
|
|
BIT_INSERT (*(Elf64_Half *) reloc_addr, value, 0xfffc);
|
|
break;
|
|
|
|
case R_PPC64_ADDR16_LO:
|
|
*(Elf64_Half *) reloc_addr = PPC_LO (value);
|
|
break;
|
|
|
|
case R_PPC64_ADDR16_HI:
|
|
*(Elf64_Half *) reloc_addr = PPC_HI (value);
|
|
break;
|
|
|
|
case R_PPC64_ADDR16_HA:
|
|
*(Elf64_Half *) reloc_addr = PPC_HA (value);
|
|
break;
|
|
|
|
case R_PPC64_ADDR30:
|
|
{
|
|
Elf64_Addr delta = value - (Elf64_Xword) reloc_addr;
|
|
if (dont_expect ((delta + 0x80000000) >= 0x10000000
|
|
|| (delta & 3) != 0))
|
|
_dl_reloc_overflow (map, "R_PPC64_ADDR30", reloc_addr, refsym);
|
|
BIT_INSERT (*(Elf64_Word *) reloc_addr, delta, 0xfffffffc);
|
|
}
|
|
break;
|
|
|
|
case R_PPC64_COPY:
|
|
if (dont_expect (sym == NULL))
|
|
/* This can happen in trace mode when an object could not be found. */
|
|
return;
|
|
if (dont_expect (sym->st_size > refsym->st_size
|
|
|| (GL(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",
|
|
_dl_argv[0] ?: "<program name unknown>",
|
|
strtab + refsym->st_name);
|
|
}
|
|
memcpy (reloc_addr_arg, (char *) value,
|
|
MIN (sym->st_size, refsym->st_size));
|
|
return;
|
|
|
|
case R_PPC64_UADDR64:
|
|
/* We are big-endian. */
|
|
((char *) reloc_addr_arg)[0] = (value >> 56) & 0xff;
|
|
((char *) reloc_addr_arg)[1] = (value >> 48) & 0xff;
|
|
((char *) reloc_addr_arg)[2] = (value >> 40) & 0xff;
|
|
((char *) reloc_addr_arg)[3] = (value >> 32) & 0xff;
|
|
((char *) reloc_addr_arg)[4] = (value >> 24) & 0xff;
|
|
((char *) reloc_addr_arg)[5] = (value >> 16) & 0xff;
|
|
((char *) reloc_addr_arg)[6] = (value >> 8) & 0xff;
|
|
((char *) reloc_addr_arg)[7] = (value >> 0) & 0xff;
|
|
return;
|
|
|
|
case R_PPC64_UADDR32:
|
|
/* We are big-endian. */
|
|
((char *) reloc_addr_arg)[0] = (value >> 24) & 0xff;
|
|
((char *) reloc_addr_arg)[1] = (value >> 16) & 0xff;
|
|
((char *) reloc_addr_arg)[2] = (value >> 8) & 0xff;
|
|
((char *) reloc_addr_arg)[3] = (value >> 0) & 0xff;
|
|
return;
|
|
|
|
case R_PPC64_ADDR32:
|
|
if (dont_expect ((value + 0x80000000) >= 0x10000000))
|
|
_dl_reloc_overflow (map, "R_PPC64_ADDR32", reloc_addr, refsym);
|
|
*(Elf64_Word *) reloc_addr = value;
|
|
return;
|
|
|
|
case R_PPC64_ADDR24:
|
|
if (dont_expect ((value + 0x2000000) >= 0x4000000 || (value & 3) != 0))
|
|
_dl_reloc_overflow (map, "R_PPC64_ADDR24", reloc_addr, refsym);
|
|
BIT_INSERT (*(Elf64_Word *) reloc_addr, value, 0x3fffffc);
|
|
break;
|
|
|
|
case R_PPC64_ADDR16:
|
|
if (dont_expect ((value + 0x8000) >= 0x10000))
|
|
_dl_reloc_overflow (map, "R_PPC64_ADDR16", reloc_addr, refsym);
|
|
*(Elf64_Half *) reloc_addr = value;
|
|
break;
|
|
|
|
case R_PPC64_UADDR16:
|
|
if (dont_expect ((value + 0x8000) >= 0x10000))
|
|
_dl_reloc_overflow (map, "R_PPC64_UADDR16", reloc_addr, refsym);
|
|
/* We are big-endian. */
|
|
((char *) reloc_addr_arg)[0] = (value >> 8) & 0xff;
|
|
((char *) reloc_addr_arg)[1] = (value >> 0) & 0xff;
|
|
break;
|
|
|
|
case R_PPC64_ADDR16_DS:
|
|
if (dont_expect ((value + 0x8000) >= 0x10000 || (value & 3) != 0))
|
|
_dl_reloc_overflow (map, "R_PPC64_ADDR16_DS", reloc_addr, refsym);
|
|
BIT_INSERT (*(Elf64_Half *) reloc_addr, value, 0xfffc);
|
|
break;
|
|
|
|
case R_PPC64_ADDR16_HIGHER:
|
|
*(Elf64_Half *) reloc_addr = PPC_HIGHER (value);
|
|
break;
|
|
|
|
case R_PPC64_ADDR16_HIGHEST:
|
|
*(Elf64_Half *) reloc_addr = PPC_HIGHEST (value);
|
|
break;
|
|
|
|
case R_PPC64_ADDR16_HIGHERA:
|
|
*(Elf64_Half *) reloc_addr = PPC_HIGHERA (value);
|
|
break;
|
|
|
|
case R_PPC64_ADDR16_HIGHESTA:
|
|
*(Elf64_Half *) reloc_addr = PPC_HIGHESTA (value);
|
|
break;
|
|
|
|
case R_PPC64_ADDR14:
|
|
case R_PPC64_ADDR14_BRTAKEN:
|
|
case R_PPC64_ADDR14_BRNTAKEN:
|
|
{
|
|
if (dont_expect ((value + 0x8000) >= 0x10000 || (value & 3) != 0))
|
|
_dl_reloc_overflow (map, "R_PPC64_ADDR14", reloc_addr, refsym);
|
|
Elf64_Word insn = *(Elf64_Word *) reloc_addr;
|
|
BIT_INSERT (insn, value, 0xfffc);
|
|
if (r_type != R_PPC64_ADDR14)
|
|
{
|
|
insn &= ~(1 << 21);
|
|
if (r_type == R_PPC64_ADDR14_BRTAKEN)
|
|
insn |= 1 << 21;
|
|
if ((insn & (0x14 << 21)) == (0x04 << 21))
|
|
insn |= 0x02 << 21;
|
|
else if ((insn & (0x14 << 21)) == (0x10 << 21))
|
|
insn |= 0x08 << 21;
|
|
}
|
|
*(Elf64_Word *) reloc_addr = insn;
|
|
}
|
|
break;
|
|
|
|
case R_PPC64_REL32:
|
|
*(Elf64_Word *) reloc_addr = value - (Elf64_Addr) reloc_addr;
|
|
return;
|
|
|
|
case R_PPC64_REL64:
|
|
*reloc_addr = value - (Elf64_Addr) reloc_addr;
|
|
return;
|
|
#endif /* !RTLD_BOOTSTRAP */
|
|
|
|
default:
|
|
_dl_reloc_bad_type (map, r_type, 0);
|
|
return;
|
|
}
|
|
MODIFIED_CODE_NOQUEUE (reloc_addr);
|
|
}
|
|
|
|
static inline void
|
|
elf_machine_lazy_rel (struct link_map *map,
|
|
Elf64_Addr l_addr, const Elf64_Rela *reloc)
|
|
{
|
|
/* elf_machine_runtime_setup handles this. */
|
|
}
|
|
|
|
#endif /* RESOLVE */
|