1023 lines
33 KiB
C
1023 lines
33 KiB
C
/* Machine-dependent ELF dynamic relocation inline functions.
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PowerPC64 version.
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Copyright 1995-2015 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
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not, see <http://www.gnu.org/licenses/>. */
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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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#include <sysdep.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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#if _CALL_ELF != 2
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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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#endif
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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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/* Verify that the binary matches our ABI version. */
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if ((ehdr->e_flags & EF_PPC64_ABI) != 0)
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{
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#if _CALL_ELF != 2
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if ((ehdr->e_flags & EF_PPC64_ABI) != 1)
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return 0;
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#else
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if ((ehdr->e_flags & EF_PPC64_ABI) != 2)
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return 0;
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#endif
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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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#ifdef HAVE_INLINED_SYSCALLS
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/* We do not need _dl_starting_up. */
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# define DL_STARTING_UP_DEF
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#else
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# define DL_STARTING_UP_DEF \
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".LC__dl_starting_up:\n" \
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" .tc __GI__dl_starting_up[TC],__GI__dl_starting_up\n"
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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 (".pushsection \".text\"\n" \
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" .align 2\n" \
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" " ENTRY_2(_start) "\n" \
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BODY_PREFIX "_start:\n" \
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" " LOCALENTRY(_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 " DOT_PREFIX "_dl_start\n" \
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" nop\n" \
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/* Transfer control to _dl_start_user! */ \
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" b " DOT_PREFIX "_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-" BODY_PREFIX "_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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" " END_2(_start) "\n" \
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" .pushsection \".toc\",\"aw\"\n" \
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DL_STARTING_UP_DEF \
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".LC__rtld_local:\n" \
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" .tc _rtld_local[TC],_rtld_local\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 __GI__dl_argv[TC],__GI__dl_argv\n" \
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".LC__dl_fini:\n" \
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" .tc _dl_fini[TC],_dl_fini\n" \
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" .popsection\n" \
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" " ENTRY_2(_dl_start_user) "\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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BODY_PREFIX "_dl_start_user:\n" \
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" " LOCALENTRY(_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_local@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 " DOT_PREFIX "_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 auxiliary 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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/* 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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/* 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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" " PPC64_LOAD_FUNCPTR(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-" BODY_PREFIX "_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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" " END_2(_dl_start_user) "\n" \
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" .popsection");
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/* ELF_RTYPE_CLASS_COPY iff TYPE should not be allowed to resolve to
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one of the main executable's symbols, as for a COPY reloc.
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To make function pointer comparisons work on most targets, the
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relevant ABI states that the address of a non-local function in a
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dynamically linked executable is the address of the PLT entry for
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that function. This is quite reasonable since using the real
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function address in a non-PIC executable would typically require
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dynamic relocations in .text, something to be avoided. For such
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functions, the linker emits a SHN_UNDEF symbol in the executable
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with value equal to the PLT entry address. Normally, SHN_UNDEF
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symbols have a value of zero, so this is a clue to ld.so that it
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should treat these symbols specially. For relocations not in
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ELF_RTYPE_CLASS_PLT (eg. those on function pointers), ld.so should
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use the value of the executable SHN_UNDEF symbol, ie. the PLT entry
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address. For relocations in ELF_RTYPE_CLASS_PLT (eg. the relocs in
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the PLT itself), ld.so should use the value of the corresponding
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defined symbol in the object that defines the function, ie. the
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real function address. This complicates ld.so in that there are
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now two possible values for a given symbol, and it gets even worse
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because protected symbols need yet another set of rules.
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On PowerPC64 we don't need any of this. The linker won't emit
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SHN_UNDEF symbols with non-zero values. ld.so can make all
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relocations behave "normally", ie. always use the real address
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like PLT relocations. So always set ELF_RTYPE_CLASS_PLT. */
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#if _CALL_ELF != 2
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#define elf_machine_type_class(type) \
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(ELF_RTYPE_CLASS_PLT | (((type) == R_PPC64_COPY) * ELF_RTYPE_CLASS_COPY))
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#else
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/* And now that you have read that large comment, you can disregard it
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all for ELFv2. ELFv2 does need the special SHN_UNDEF treatment. */
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#define IS_PPC64_TLS_RELOC(R) \
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(((R) >= R_PPC64_TLS && (R) <= R_PPC64_DTPREL16_HIGHESTA) \
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|| ((R) >= R_PPC64_TPREL16_HIGH && (R) <= R_PPC64_DTPREL16_HIGHA))
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#define elf_machine_type_class(type) \
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((((type) == R_PPC64_JMP_SLOT \
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|| (type) == R_PPC64_ADDR24 \
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|| IS_PPC64_TLS_RELOC (type)) * 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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#define ELF_MACHINE_NO_RELA 0
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/* Stuff for the PLT. */
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#if _CALL_ELF != 2
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#define PLT_INITIAL_ENTRY_WORDS 3
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#define PLT_ENTRY_WORDS 3
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#define GLINK_INITIAL_ENTRY_WORDS 8
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/* The first 32k entries of glink can set an index and branch using two
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instructions; past that point, glink uses three instructions. */
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#define GLINK_ENTRY_WORDS(I) (((I) < 0x8000)? 2 : 3)
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#else
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#define PLT_INITIAL_ENTRY_WORDS 2
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#define PLT_ENTRY_WORDS 1
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#define GLINK_INITIAL_ENTRY_WORDS 8
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#define GLINK_ENTRY_WORDS(I) 1
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#endif
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#define PPC_DCBST(where) asm volatile ("dcbst 0,%0" : : "r"(where) : "memory")
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#define PPC_DCBT(where) asm volatile ("dcbt 0,%0" : : "r"(where) : "memory")
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#define PPC_DCBF(where) asm volatile ("dcbf 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)
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/* Set up the loaded object described by MAP 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__ ((always_inline))
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elf_machine_runtime_setup (struct link_map *map, int lazy, int profile)
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{
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if (map->l_info[DT_JMPREL])
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{
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Elf64_Word i;
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Elf64_Word *glink = NULL;
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Elf64_Xword *plt = (Elf64_Xword *) D_PTR (map, l_info[DT_PLTGOT]);
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Elf64_Word num_plt_entries = (map->l_info[DT_PLTRELSZ]->d_un.d_val
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/ sizeof (Elf64_Rela));
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Elf64_Addr l_addr = map->l_addr;
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Elf64_Dyn **info = map->l_info;
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char *p;
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extern void _dl_runtime_resolve (void);
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extern void _dl_profile_resolve (void);
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/* Relocate the DT_PPC64_GLINK entry in the _DYNAMIC section.
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elf_get_dynamic_info takes care of the standard entries but
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doesn't know exactly what to do with processor specific
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entries. */
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if (info[DT_PPC64(GLINK)] != NULL)
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info[DT_PPC64(GLINK)]->d_un.d_ptr += l_addr;
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if (lazy)
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{
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Elf64_Word glink_offset;
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Elf64_Word offset;
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Elf64_Addr dlrr;
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dlrr = (Elf64_Addr) (profile ? _dl_profile_resolve
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: _dl_runtime_resolve);
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if (profile && GLRO(dl_profile) != NULL
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&& _dl_name_match_p (GLRO(dl_profile), map))
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/* This is the object we are looking for. Say that we really
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want profiling and the timers are started. */
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GL(dl_profile_map) = map;
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#if _CALL_ELF != 2
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/* We need to stuff the address/TOC of _dl_runtime_resolve
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into doublewords 0 and 1 of plt_reserve. Then we need to
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stuff the map address into doubleword 2 of plt_reserve.
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This allows the GLINK0 code to transfer control to the
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correct trampoline which will transfer control to fixup
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in dl-machine.c. */
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{
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/* The plt_reserve area is the 1st 3 doublewords of the PLT. */
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Elf64_FuncDesc *plt_reserve = (Elf64_FuncDesc *) plt;
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Elf64_FuncDesc *resolve_fd = (Elf64_FuncDesc *) dlrr;
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plt_reserve->fd_func = resolve_fd->fd_func;
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plt_reserve->fd_toc = resolve_fd->fd_toc;
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plt_reserve->fd_aux = (Elf64_Addr) map;
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#ifdef RTLD_BOOTSTRAP
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/* When we're bootstrapping, the opd entry will not have
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been relocated yet. */
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plt_reserve->fd_func += l_addr;
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plt_reserve->fd_toc += l_addr;
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#endif
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}
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#else
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/* When we don't have function descriptors, the first doubleword
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of the PLT holds the address of _dl_runtime_resolve, and the
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second doubleword holds the map address. */
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plt[0] = dlrr;
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plt[1] = (Elf64_Addr) map;
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#endif
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/* Set up the lazy PLT entries. */
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glink = (Elf64_Word *) D_PTR (map, l_info[DT_PPC64(GLINK)]);
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offset = PLT_INITIAL_ENTRY_WORDS;
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glink_offset = GLINK_INITIAL_ENTRY_WORDS;
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for (i = 0; i < num_plt_entries; i++)
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{
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plt[offset] = (Elf64_Xword) &glink[glink_offset];
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offset += PLT_ENTRY_WORDS;
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glink_offset += GLINK_ENTRY_WORDS (i);
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}
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/* Now, we've modified data. We need to write the changes from
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the data cache to a second-level unified cache, then make
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sure that stale data in the instruction cache is removed.
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|
(In a multiprocessor system, the effect is more complex.)
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Most of the PLT shouldn't be in the instruction cache, but
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there may be a little overlap at the start and the end.
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Assumes that dcbst and icbi apply to lines of 16 bytes or
|
|
more. Current known line sizes are 16, 32, and 128 bytes. */
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|
|
for (p = (char *) plt; p < (char *) &plt[offset]; p += 16)
|
|
PPC_DCBST (p);
|
|
PPC_SYNC;
|
|
}
|
|
}
|
|
return lazy;
|
|
}
|
|
|
|
#if _CALL_ELF == 2
|
|
/* If the PLT entry whose reloc is 'reloc' resolves to a function in
|
|
the same object, return the target function's local entry point
|
|
offset if usable. */
|
|
static inline Elf64_Addr __attribute__ ((always_inline))
|
|
ppc64_local_entry_offset (struct link_map *map, lookup_t sym_map,
|
|
const Elf64_Rela *reloc)
|
|
{
|
|
const Elf64_Sym *symtab;
|
|
const Elf64_Sym *sym;
|
|
|
|
/* If the target function is in a different object, we cannot
|
|
use the local entry point. */
|
|
if (sym_map != map)
|
|
return 0;
|
|
|
|
/* If the linker inserted multiple TOCs, we cannot use the
|
|
local entry point. */
|
|
if (map->l_info[DT_PPC64(OPT)]
|
|
&& (map->l_info[DT_PPC64(OPT)]->d_un.d_val & PPC64_OPT_MULTI_TOC))
|
|
return 0;
|
|
|
|
/* Otherwise, we can use the local entry point. Retrieve its offset
|
|
from the symbol's ELF st_other field. */
|
|
symtab = (const void *) D_PTR (map, l_info[DT_SYMTAB]);
|
|
sym = &symtab[ELFW(R_SYM) (reloc->r_info)];
|
|
|
|
/* If the target function is an ifunc then the local entry offset is
|
|
for the resolver, not the final destination. */
|
|
if (__builtin_expect (ELFW(ST_TYPE) (sym->st_info) == STT_GNU_IFUNC, 0))
|
|
return 0;
|
|
|
|
return PPC64_LOCAL_ENTRY_OFFSET (sym->st_other);
|
|
}
|
|
#endif
|
|
|
|
/* Change the PLT entry whose reloc is 'reloc' to call the actual
|
|
routine. */
|
|
static inline Elf64_Addr __attribute__ ((always_inline))
|
|
elf_machine_fixup_plt (struct link_map *map, lookup_t sym_map,
|
|
const Elf64_Rela *reloc,
|
|
Elf64_Addr *reloc_addr, Elf64_Addr finaladdr)
|
|
{
|
|
#if _CALL_ELF != 2
|
|
Elf64_FuncDesc *plt = (Elf64_FuncDesc *) reloc_addr;
|
|
Elf64_FuncDesc *rel = (Elf64_FuncDesc *) finaladdr;
|
|
Elf64_Addr offset = 0;
|
|
Elf64_FuncDesc zero_fd = {0, 0, 0};
|
|
|
|
PPC_DCBT (&plt->fd_aux);
|
|
PPC_DCBT (&plt->fd_func);
|
|
|
|
/* If sym_map is NULL, it's a weak undefined sym; Set the plt to
|
|
zero. finaladdr should be zero already in this case, but guard
|
|
against invalid plt relocations with non-zero addends. */
|
|
if (sym_map == NULL)
|
|
finaladdr = 0;
|
|
|
|
/* Don't die here if finaladdr is zero, die if this plt entry is
|
|
actually called. Makes a difference when LD_BIND_NOW=1.
|
|
finaladdr may be zero for a weak undefined symbol, or when an
|
|
ifunc resolver returns zero. */
|
|
if (finaladdr == 0)
|
|
rel = &zero_fd;
|
|
else
|
|
{
|
|
PPC_DCBT (&rel->fd_aux);
|
|
PPC_DCBT (&rel->fd_func);
|
|
}
|
|
|
|
/* 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 (finaladdr != 0 && 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_DCBF (&plt->fd_toc);
|
|
PPC_ISYNC;
|
|
|
|
plt->fd_func = rel->fd_func + offset;
|
|
PPC_DCBST (&plt->fd_func);
|
|
PPC_ISYNC;
|
|
#else
|
|
finaladdr += ppc64_local_entry_offset (map, sym_map, reloc);
|
|
*reloc_addr = finaladdr;
|
|
#endif
|
|
|
|
return finaladdr;
|
|
}
|
|
|
|
static inline void __attribute__ ((always_inline))
|
|
elf_machine_plt_conflict (struct link_map *map, lookup_t sym_map,
|
|
const Elf64_Rela *reloc,
|
|
Elf64_Addr *reloc_addr, Elf64_Addr finaladdr)
|
|
{
|
|
#if _CALL_ELF != 2
|
|
Elf64_FuncDesc *plt = (Elf64_FuncDesc *) reloc_addr;
|
|
Elf64_FuncDesc *rel = (Elf64_FuncDesc *) finaladdr;
|
|
Elf64_FuncDesc zero_fd = {0, 0, 0};
|
|
|
|
if (sym_map == NULL)
|
|
finaladdr = 0;
|
|
|
|
if (finaladdr == 0)
|
|
rel = &zero_fd;
|
|
|
|
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;
|
|
#else
|
|
finaladdr += ppc64_local_entry_offset (map, sym_map, reloc);
|
|
*reloc_addr = finaladdr;
|
|
#endif
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
|
|
|
|
/* Names of the architecture-specific auditing callback functions. */
|
|
#if _CALL_ELF != 2
|
|
#define ARCH_LA_PLTENTER ppc64_gnu_pltenter
|
|
#define ARCH_LA_PLTEXIT ppc64_gnu_pltexit
|
|
#else
|
|
#define ARCH_LA_PLTENTER ppc64v2_gnu_pltenter
|
|
#define ARCH_LA_PLTEXIT ppc64v2_gnu_pltexit
|
|
#endif
|
|
|
|
#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;
|
|
|
|
auto inline void __attribute__ ((always_inline))
|
|
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;
|
|
}
|
|
|
|
/* This computes the value used by TPREL* relocs. */
|
|
auto inline Elf64_Addr __attribute__ ((always_inline, 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;
|
|
}
|
|
|
|
/* Call function at address VALUE (an OPD entry) to resolve ifunc relocs. */
|
|
auto inline Elf64_Addr __attribute__ ((always_inline))
|
|
resolve_ifunc (Elf64_Addr value,
|
|
const struct link_map *map, const struct link_map *sym_map)
|
|
{
|
|
#if _CALL_ELF != 2
|
|
#ifndef RESOLVE_CONFLICT_FIND_MAP
|
|
/* The function we are calling may not yet have its opd entry relocated. */
|
|
Elf64_FuncDesc opd;
|
|
if (map != sym_map
|
|
# if !defined RTLD_BOOTSTRAP && defined SHARED
|
|
/* Bootstrap map doesn't have l_relocated set for it. */
|
|
&& sym_map != &GL(dl_rtld_map)
|
|
# endif
|
|
&& !sym_map->l_relocated)
|
|
{
|
|
Elf64_FuncDesc *func = (Elf64_FuncDesc *) value;
|
|
opd.fd_func = func->fd_func + sym_map->l_addr;
|
|
opd.fd_toc = func->fd_toc + sym_map->l_addr;
|
|
opd.fd_aux = func->fd_aux;
|
|
/* GCC 4.9+ eliminates the branch as dead code, force the odp set
|
|
dependency. */
|
|
asm ("" : "=r" (value) : "0" (&opd), "X" (opd));
|
|
}
|
|
#endif
|
|
#endif
|
|
return ((Elf64_Addr (*) (unsigned long int)) value) (GLRO(dl_hwcap));
|
|
}
|
|
|
|
/* Perform the relocation specified by RELOC and SYM (which is fully
|
|
resolved). MAP is the object containing the reloc. */
|
|
auto inline void __attribute__ ((always_inline))
|
|
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,
|
|
int skip_ifunc)
|
|
{
|
|
Elf64_Addr *const reloc_addr = reloc_addr_arg;
|
|
const int r_type = ELF64_R_TYPE (reloc->r_info);
|
|
const Elf64_Sym *const refsym = sym;
|
|
union unaligned
|
|
{
|
|
uint16_t u2;
|
|
uint32_t u4;
|
|
uint64_t u8;
|
|
} __attribute__ ((__packed__));
|
|
|
|
if (r_type == R_PPC64_RELATIVE)
|
|
{
|
|
*reloc_addr = map->l_addr + reloc->r_addend;
|
|
return;
|
|
}
|
|
|
|
if (__glibc_unlikely (r_type == R_PPC64_NONE))
|
|
return;
|
|
|
|
/* We need SYM_MAP even in the absence of TLS, for elf_machine_fixup_plt
|
|
and STT_GNU_IFUNC. */
|
|
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);
|
|
|
|
if (sym != NULL
|
|
&& __builtin_expect (ELFW(ST_TYPE) (sym->st_info) == STT_GNU_IFUNC, 0)
|
|
&& __builtin_expect (sym->st_shndx != SHN_UNDEF, 1)
|
|
&& __builtin_expect (!skip_ifunc, 1))
|
|
value = resolve_ifunc (value, map, sym_map);
|
|
|
|
/* 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_IRELATIVE:
|
|
if (__glibc_likely (!skip_ifunc))
|
|
value = resolve_ifunc (value, map, sym_map);
|
|
*reloc_addr = value;
|
|
return;
|
|
|
|
case R_PPC64_JMP_IREL:
|
|
if (__glibc_likely (!skip_ifunc))
|
|
value = resolve_ifunc (value, map, sym_map);
|
|
/* Fall thru */
|
|
case R_PPC64_JMP_SLOT:
|
|
#ifdef RESOLVE_CONFLICT_FIND_MAP
|
|
elf_machine_plt_conflict (map, sym_map, reloc, reloc_addr, value);
|
|
#else
|
|
elf_machine_fixup_plt (map, sym_map, reloc, reloc_addr, value);
|
|
#endif
|
|
return;
|
|
|
|
case R_PPC64_DTPMOD64:
|
|
if (map->l_info[DT_PPC64(OPT)]
|
|
&& (map->l_info[DT_PPC64(OPT)]->d_un.d_val & PPC64_OPT_TLS))
|
|
{
|
|
#ifdef RTLD_BOOTSTRAP
|
|
reloc_addr[0] = 0;
|
|
reloc_addr[1] = (sym_map->l_tls_offset - TLS_TP_OFFSET
|
|
+ TLS_DTV_OFFSET);
|
|
return;
|
|
#else
|
|
if (sym_map != NULL)
|
|
{
|
|
# ifndef SHARED
|
|
CHECK_STATIC_TLS (map, sym_map);
|
|
# else
|
|
if (TRY_STATIC_TLS (map, sym_map))
|
|
# endif
|
|
{
|
|
reloc_addr[0] = 0;
|
|
/* Set up for local dynamic. */
|
|
reloc_addr[1] = (sym_map->l_tls_offset - TLS_TP_OFFSET
|
|
+ TLS_DTV_OFFSET);
|
|
return;
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
#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:
|
|
if (map->l_info[DT_PPC64(OPT)]
|
|
&& (map->l_info[DT_PPC64(OPT)]->d_un.d_val & PPC64_OPT_TLS))
|
|
{
|
|
#ifdef RTLD_BOOTSTRAP
|
|
*reloc_addr = TLS_TPREL_VALUE (sym_map, sym, reloc);
|
|
return;
|
|
#else
|
|
if (sym_map != NULL)
|
|
{
|
|
/* This reloc is always preceded by R_PPC64_DTPMOD64. */
|
|
# ifndef SHARED
|
|
assert (HAVE_STATIC_TLS (map, sym_map));
|
|
# else
|
|
if (HAVE_STATIC_TLS (map, sym_map))
|
|
# endif
|
|
{
|
|
*reloc_addr = TLS_TPREL_VALUE (sym_map, sym, reloc);
|
|
return;
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
/* 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);
|
|
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);
|
|
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);
|
|
if (dont_expect (value + 0x80000000 >= 0x100000000LL))
|
|
_dl_reloc_overflow (map, "R_PPC64_TPREL16_HI", reloc_addr, refsym);
|
|
*(Elf64_Half *) reloc_addr = PPC_HI (value);
|
|
break;
|
|
|
|
case R_PPC64_TPREL16_HIGH:
|
|
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);
|
|
if (dont_expect (value + 0x80008000 >= 0x100000000LL))
|
|
_dl_reloc_overflow (map, "R_PPC64_TPREL16_HA", reloc_addr, refsym);
|
|
*(Elf64_Half *) reloc_addr = PPC_HA (value);
|
|
break;
|
|
|
|
case R_PPC64_TPREL16_HIGHA:
|
|
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;
|
|
|
|
#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:
|
|
if (dont_expect (value + 0x80000000 >= 0x100000000LL))
|
|
_dl_reloc_overflow (map, "R_PPC64_ADDR16_HI", reloc_addr, refsym);
|
|
case R_PPC64_ADDR16_HIGH:
|
|
*(Elf64_Half *) reloc_addr = PPC_HI (value);
|
|
break;
|
|
|
|
case R_PPC64_ADDR16_HA:
|
|
if (dont_expect (value + 0x80008000 >= 0x100000000LL))
|
|
_dl_reloc_overflow (map, "R_PPC64_ADDR16_HA", reloc_addr, refsym);
|
|
case R_PPC64_ADDR16_HIGHA:
|
|
*(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) >= 0x100000000LL
|
|
|| (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
|
|
|| (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, strtab + refsym->st_name);
|
|
}
|
|
memcpy (reloc_addr_arg, (char *) value,
|
|
MIN (sym->st_size, refsym->st_size));
|
|
return;
|
|
|
|
case R_PPC64_UADDR64:
|
|
((union unaligned *) reloc_addr)->u8 = value;
|
|
return;
|
|
|
|
case R_PPC64_UADDR32:
|
|
((union unaligned *) reloc_addr)->u4 = value;
|
|
return;
|
|
|
|
case R_PPC64_ADDR32:
|
|
if (dont_expect ((value + 0x80000000) >= 0x100000000LL))
|
|
_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);
|
|
((union unaligned *) reloc_addr)->u2 = value;
|
|
return;
|
|
|
|
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);
|
|
}
|
|
|
|
auto inline void __attribute__ ((always_inline))
|
|
elf_machine_lazy_rel (struct link_map *map,
|
|
Elf64_Addr l_addr, const Elf64_Rela *reloc,
|
|
int skip_ifunc)
|
|
{
|
|
/* elf_machine_runtime_setup handles this. */
|
|
}
|
|
|
|
|
|
#endif /* RESOLVE */
|