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afdca0f2a3
* sysdeps/sparc/sparc64/dl-machine.h: Likewise. * sysdeps/sparc/sparc32/dl-machine.h: Likewise. * sysdeps/s390/s390-64/dl-machine.h: Likewise. * sysdeps/s390/s390-32/dl-machine.h: Likewise. * sysdeps/powerpc/powerpc64/dl-machine.h: Likewise. * sysdeps/powerpc/powerpc32/dl-machine.c: Likewise. * sysdeps/m68k/dl-machine.h: Likewise. * sysdeps/ia64/dl-machine.h: Likewise. * sysdeps/arm/dl-machine.h: Likewise. * sysdeps/alpha/dl-machine.h: Likewise.
571 lines
17 KiB
C
571 lines
17 KiB
C
/* Machine-dependent ELF dynamic relocation inline functions. S390 Version.
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Copyright (C) 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
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Contributed by Carl Pederson & Martin Schwidefsky.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef dl_machine_h
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#define dl_machine_h
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#define ELF_MACHINE_NAME "s390"
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#include <sys/param.h>
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#include <string.h>
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#include <link.h>
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/* This is an older, now obsolete value. */
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#define EM_S390_OLD 0xA390
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/* Return nonzero iff ELF header is compatible with the running host. */
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static inline int
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elf_machine_matches_host (const Elf32_Ehdr *ehdr)
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{
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return (ehdr->e_machine == EM_S390 || ehdr->e_machine == EM_S390_OLD)
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&& ehdr->e_ident[EI_CLASS] == ELFCLASS32;
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}
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/* Return the link-time address of _DYNAMIC. Conveniently, this is the
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first element of the GOT. This must be inlined in a function which
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uses global data. */
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static inline Elf32_Addr
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elf_machine_dynamic (void)
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{
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register Elf32_Addr *got;
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asm( " bras %0,2f\n"
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"1: .long _GLOBAL_OFFSET_TABLE_-1b\n"
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"2: al %0,0(%0)"
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: "=&a" (got) : : "0" );
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return *got;
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}
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/* Return the run-time load address of the shared object. */
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static inline Elf32_Addr
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elf_machine_load_address (void)
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{
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Elf32_Addr addr;
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asm( " bras 1,2f\n"
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"1: .long _GLOBAL_OFFSET_TABLE_ - 1b\n"
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" .long _dl_start - 1b - 0x80000000\n"
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"2: l %0,4(1)\n"
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" ar %0,1\n"
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" al 1,0(1)\n"
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" sl %0,_dl_start@GOT12(1)"
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: "=&d" (addr) : : "1" );
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return addr;
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}
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/* Set up the loaded object described by L so its unrelocated PLT
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entries will jump to the on-demand fixup code in dl-runtime.c. */
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static inline int __attribute__ ((unused))
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elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
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{
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extern void _dl_runtime_resolve (Elf32_Word);
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extern void _dl_runtime_profile (Elf32_Word);
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if (l->l_info[DT_JMPREL] && lazy)
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{
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/* The GOT entries for functions in the PLT have not yet been filled
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in. Their initial contents will arrange when called to push an
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offset into the .rel.plt section, push _GLOBAL_OFFSET_TABLE_[1],
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and then jump to _GLOBAL_OFFSET_TABLE[2]. */
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Elf32_Addr *got;
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got = (Elf32_Addr *) D_PTR (l, l_info[DT_PLTGOT]);
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/* If a library is prelinked but we have to relocate anyway,
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we have to be able to undo the prelinking of .got.plt.
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The prelinker saved us here address of .plt + 0x2c. */
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if (got[1])
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{
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l->l_mach.plt = got[1] + l->l_addr;
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l->l_mach.gotplt = (Elf32_Addr) &got[3];
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}
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got[1] = (Elf32_Addr) l; /* Identify this shared object. */
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/* The got[2] entry contains the address of a function which gets
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called to get the address of a so far unresolved function and
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jump to it. The profiling extension of the dynamic linker allows
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to intercept the calls to collect information. In this case we
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don't store the address in the GOT so that all future calls also
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end in this function. */
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if (__builtin_expect (profile, 0))
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{
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got[2] = (Elf32_Addr) &_dl_runtime_profile;
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if (_dl_name_match_p (GLRO(dl_profile), l))
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/* 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) = l;
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}
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else
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/* This function will get called to fix up the GOT entry indicated by
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the offset on the stack, and then jump to the resolved address. */
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got[2] = (Elf32_Addr) &_dl_runtime_resolve;
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}
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return lazy;
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}
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/* This code is used in dl-runtime.c to call the `fixup' function
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and then redirect to the address it returns. */
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/* s390:
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Arguments are in register.
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r2 - r7 holds the original parameters for the function call, fixup
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and trampoline code use r0-r5 and r14-15. For the correct function
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call r2-r5 and r14-15 must be restored.
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Arguments from the PLT are stored at 24(r15) and 28(r15)
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and must be moved to r2 and r3 for the fixup call (see elf32-s390.c
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in the binutils for the PLT code).
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Fixup function address in r2.
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*/
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#ifndef PROF
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#define ELF_MACHINE_RUNTIME_TRAMPOLINE \
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asm ( "\
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.text\n\
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.globl _dl_runtime_resolve\n\
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.type _dl_runtime_resolve, @function\n\
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.align 16\n\
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" CFI_STARTPROC "\n\
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_dl_runtime_resolve:\n\
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# save registers\n\
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stm 2,5,32(15)\n\
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st 14,48(15)\n\
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lr 0,15\n\
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ahi 15,-96\n\
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" CFI_ADJUST_CFA_OFFSET(96)"\n\
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st 0,0(15)\n\
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# load args saved by PLT\n\
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lm 2,3,120(15)\n\
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basr 1,0\n\
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0: ahi 1,1f-0b\n\
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l 14,0(1)\n\
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bas 14,0(14,1) # call fixup\n\
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lr 1,2 # function addr returned in r2\n\
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# restore registers\n\
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ahi 15,96\n\
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" CFI_ADJUST_CFA_OFFSET(-96)" \n\
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l 14,48(15)\n\
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lm 2,5,32(15)\n\
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br 1\n\
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1: .long fixup-1b\n\
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" CFI_ENDPROC "\n\
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.size _dl_runtime_resolve, .-_dl_runtime_resolve\n\
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\n\
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.globl _dl_runtime_profile\n\
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.type _dl_runtime_profile, @function\n\
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.align 16\n\
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" CFI_STARTPROC "\n\
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_dl_runtime_profile:\n\
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# save registers\n\
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stm 2,5,32(15)\n\
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st 14,48(15)\n\
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lr 0,15\n\
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ahi 15,-96\n\
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" CFI_ADJUST_CFA_OFFSET(96)"\n\
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st 0,0(15)\n\
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# load args saved by PLT\n\
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lm 2,3,120(15)\n\
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# load return address as third parameter\n\
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lr 4,14\n\
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basr 1,0\n\
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0: ahi 1,1f-0b\n\
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l 14,0(1)\n\
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bas 14,0(14,1) # call fixup\n\
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lr 1,2 # function addr returned in r2\n\
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# restore registers\n\
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ahi 15,96\n\
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" CFI_ADJUST_CFA_OFFSET(-96)" \n\
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l 14,48(15)\n\
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lm 2,5,32(15)\n\
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br 1\n\
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1: .long profile_fixup-1b\n\
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" CFI_ENDPROC "\n\
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.size _dl_runtime_profile, .-_dl_runtime_profile\n\
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");
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#else
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#define ELF_MACHINE_RUNTIME_TRAMPOLINE \
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asm ( "\
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.text\n\
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.globl _dl_runtime_resolve\n\
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.globl _dl_runtime_profile\n\
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.type _dl_runtime_resolve, @function\n\
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.type _dl_runtime_profile, @function\n\
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.align 16\n\
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" CFI_STARTPROC "\n\
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_dl_runtime_resolve:\n\
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_dl_runtime_profile:\n\
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# save registers\n\
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stm 2,5,32(15)\n\
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st 14,48(15)\n\
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lr 0,15\n\
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ahi 15,-96\n\
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" CFI_ADJUST_CFA_OFFSET(96)"\n\
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st 0,0(15)\n\
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# load args saved by PLT\n\
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lm 2,3,120(15)\n\
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# load return address as third parameter\n\
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lr 4,14\n\
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basr 1,0\n\
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0: ahi 1,1f-0b\n\
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l 14,0(1)\n\
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bas 14,0(14,1) # call fixup\n\
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lr 1,2 # function addr returned in r2\n\
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# restore registers\n\
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ahi 15,96\n\
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" CFI_ADJUST_CFA_OFFSET(-96)" \n\
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l 14,48(15)\n\
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lm 2,5,32(15)\n\
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br 1\n\
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1: .long fixup-1b\n\
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" CFI_ENDPROC "\n\
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.size _dl_runtime_resolve, .-_dl_runtime_resolve\n\
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.size _dl_runtime_profile, .-_dl_runtime_profile\n\
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");
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#endif
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/* Mask identifying addresses reserved for the user program,
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where the dynamic linker should not map anything. */
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#define ELF_MACHINE_USER_ADDRESS_MASK 0xf8000000UL
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/* Initial entry point code for the dynamic linker.
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The C function `_dl_start' is the real entry point;
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its return value is the user program's entry point. */
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#define RTLD_START asm ("\n\
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.text\n\
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.align 4\n\
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.globl _start\n\
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.globl _dl_start_user\n\
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_start:\n\
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basr %r13,0\n\
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.L0: ahi %r13,.Llit-.L0\n\
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lr %r2,%r15\n\
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# Alloc stack frame\n\
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ahi %r15,-96\n\
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# Set the back chain to zero\n\
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xc 0(4,%r15),0(%r15)\n\
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# Call _dl_start with %r2 pointing to arg on stack\n\
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l %r14,.Ladr1-.Llit(%r13)\n\
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bas %r14,0(%r14,%r13) # call _dl_start\n\
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_dl_start_user:\n\
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# Save the user entry point address in %r8.\n\
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lr %r8,%r2\n\
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# Point %r12 at the GOT.\n\
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l %r12,.Ladr0-.Llit(%r13)\n\
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ar %r12,%r13\n\
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# See if we were run as a command with the executable file\n\
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# name as an extra leading argument.\n\
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l %r1,_dl_skip_args@GOT12(0,%r12)\n\
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l %r1,0(%r1) # load _dl_skip_args\n\
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# Get the original argument count.\n\
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l %r0,96(%r15)\n\
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# Subtract _dl_skip_args from it.\n\
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sr %r0,%r1\n\
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# Adjust the stack pointer to skip _dl_skip_args words.\n\
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sll %r1,2\n\
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ar %r15,%r1\n\
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# Set the back chain to zero again\n\
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xc 0(4,%r15),0(%r15)\n\
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# Store back the modified argument count.\n\
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st %r0,96(%r15)\n\
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# The special initializer gets called with the stack just\n\
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# as the application's entry point will see it; it can\n\
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# switch stacks if it moves these contents over.\n\
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" RTLD_START_SPECIAL_INIT "\n\
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# Call the function to run the initializers.\n\
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# Load the parameters:\n\
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# (%r2, %r3, %r4, %r5) = (_dl_loaded, argc, argv, envp)\n\
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l %r2,_rtld_local@GOT(%r12)\n\
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l %r2,0(%r2)\n\
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l %r3,96(%r15)\n\
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la %r4,100(%r15)\n\
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lr %r5,%r3\n\
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sll %r5,2\n\
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la %r5,104(%r5,%r15)\n\
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l %r1,.Ladr4-.Llit(%r13)\n\
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bas %r14,0(%r1,%r13)\n\
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# Pass our finalizer function to the user in %r14, as per ELF ABI.\n\
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l %r14,_dl_fini@GOT(%r12)\n\
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# Free stack frame\n\
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ahi %r15,96\n\
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# Jump to the user's entry point (saved in %r8).\n\
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br %r8\n\
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.Llit:\n\
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.Ladr0: .long _GLOBAL_OFFSET_TABLE_-.Llit\n\
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.Ladr1: .long _dl_start-.Llit\n\
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.Ladr4: .long _dl_init_internal@PLT-.Llit\n\
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");
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#ifndef RTLD_START_SPECIAL_INIT
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#define RTLD_START_SPECIAL_INIT /* nothing */
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#endif
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/* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry or
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TLS variable, so undefined references should not be allowed to
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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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#ifdef USE_TLS
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# define elf_machine_type_class(type) \
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((((type) == R_390_JMP_SLOT || (type) == R_390_TLS_DTPMOD \
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|| (type) == R_390_TLS_DTPOFF || (type) == R_390_TLS_TPOFF) \
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* ELF_RTYPE_CLASS_PLT) \
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| (((type) == R_390_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_390_JMP_SLOT) * ELF_RTYPE_CLASS_PLT) \
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| (((type) == R_390_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_390_JMP_SLOT
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/* The S390 never uses Elf32_Rel relocations. */
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#define ELF_MACHINE_NO_REL 1
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/* The S390 overlaps DT_RELA and DT_PLTREL. */
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#define ELF_MACHINE_PLTREL_OVERLAP 1
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/* We define an initialization functions. This is called very early in
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_dl_sysdep_start. */
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#define DL_PLATFORM_INIT dl_platform_init ()
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static inline void __attribute__ ((unused))
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dl_platform_init (void)
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{
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if (GLRO(dl_platform) != NULL && *GLRO(dl_platform) == '\0')
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/* Avoid an empty string which would disturb us. */
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GLRO(dl_platform) = NULL;
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}
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static inline Elf32_Addr
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elf_machine_fixup_plt (struct link_map *map, lookup_t t,
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const Elf32_Rela *reloc,
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Elf32_Addr *reloc_addr, Elf32_Addr value)
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{
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return *reloc_addr = value;
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}
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/* Return the final value of a plt relocation. */
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static inline Elf32_Addr
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elf_machine_plt_value (struct link_map *map, const Elf32_Rela *reloc,
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Elf32_Addr value)
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{
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return value;
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}
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#endif /* !dl_machine_h */
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#ifdef RESOLVE
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/* Perform the relocation specified by RELOC and SYM (which is fully resolved).
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MAP is the object containing the reloc. */
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static inline void
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elf_machine_rela (struct link_map *map, const Elf32_Rela *reloc,
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const Elf32_Sym *sym, const struct r_found_version *version,
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void *const reloc_addr_arg)
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{
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Elf32_Addr *const reloc_addr = reloc_addr_arg;
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const unsigned int r_type = ELF32_R_TYPE (reloc->r_info);
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#if !defined RTLD_BOOTSTRAP || !defined HAVE_Z_COMBRELOC
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if (__builtin_expect (r_type == R_390_RELATIVE, 0))
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{
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# if !defined RTLD_BOOTSTRAP && !defined HAVE_Z_COMBRELOC
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/* This is defined in rtld.c, but nowhere in the static libc.a;
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make the reference weak so static programs can still link.
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This declaration cannot be done when compiling rtld.c
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(i.e. #ifdef RTLD_BOOTSTRAP) because rtld.c contains the
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common defn for _dl_rtld_map, which is incompatible with a
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weak decl in the same file. */
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# ifndef SHARED
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weak_extern (GL(dl_rtld_map));
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# endif
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if (map != &GL(dl_rtld_map)) /* Already done in rtld itself. */
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# endif
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*reloc_addr = map->l_addr + reloc->r_addend;
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}
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else
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#endif
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if (__builtin_expect (r_type == R_390_NONE, 0))
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return;
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else
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{
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#ifndef RESOLVE_CONFLICT_FIND_MAP
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const Elf32_Sym *const refsym = sym;
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#endif
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#if defined USE_TLS && !defined RTLD_BOOTSTRAP
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struct link_map *sym_map = RESOLVE_MAP (&sym, version, r_type);
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Elf32_Addr value = sym == NULL ? 0 : sym_map->l_addr + sym->st_value;
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#else
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Elf32_Addr value = RESOLVE (&sym, version, r_type);
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# ifndef RTLD_BOOTSTRAP
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if (sym)
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# endif
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value += sym->st_value;
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#endif /* use TLS and !RTLD_BOOTSTRAP */
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switch (r_type)
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{
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case R_390_GLOB_DAT:
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case R_390_JMP_SLOT:
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*reloc_addr = value + reloc->r_addend;
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break;
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#if defined USE_TLS && (!defined RTLD_BOOTSTRAP || USE___THREAD) \
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&& !defined RESOLVE_CONFLICT_FIND_MAP
|
|
case R_390_TLS_DTPMOD:
|
|
# ifdef RTLD_BOOTSTRAP
|
|
/* During startup the dynamic linker is always the module
|
|
with index 1.
|
|
XXX If this relocation is necessary move before RESOLVE
|
|
call. */
|
|
*reloc_addr = 1;
|
|
# else
|
|
/* Get the information from the link map returned by the
|
|
resolv function. */
|
|
if (sym_map != NULL)
|
|
*reloc_addr = sym_map->l_tls_modid;
|
|
# endif
|
|
break;
|
|
case R_390_TLS_DTPOFF:
|
|
# ifndef RTLD_BOOTSTRAP
|
|
/* During relocation all TLS symbols are defined and used.
|
|
Therefore the offset is already correct. */
|
|
if (sym != NULL)
|
|
*reloc_addr = sym->st_value + reloc->r_addend;
|
|
# endif
|
|
break;
|
|
case R_390_TLS_TPOFF:
|
|
/* The offset is negative, forward from the thread pointer. */
|
|
# ifdef RTLD_BOOTSTRAP
|
|
*reloc_addr = sym->st_value + reloc->r_addend - map->l_tls_offset;
|
|
# else
|
|
/* We know the offset of the object the symbol is contained in.
|
|
It is a negative value which will be added to the
|
|
thread pointer. */
|
|
if (sym != NULL)
|
|
{
|
|
CHECK_STATIC_TLS (map, sym_map);
|
|
*reloc_addr = (sym->st_value + reloc->r_addend
|
|
- sym_map->l_tls_offset);
|
|
}
|
|
#endif
|
|
break;
|
|
#endif /* use TLS */
|
|
|
|
#ifndef RTLD_BOOTSTRAP
|
|
# ifndef RESOLVE_CONFLICT_FIND_MAP
|
|
/* Not needed in dl-conflict.c. */
|
|
case R_390_COPY:
|
|
if (sym == NULL)
|
|
/* This can happen in trace mode if an object could not be
|
|
found. */
|
|
break;
|
|
if (__builtin_expect (sym->st_size > refsym->st_size, 0)
|
|
|| (__builtin_expect (sym->st_size < refsym->st_size, 0)
|
|
&& __builtin_expect (GLRO(dl_verbose), 0)))
|
|
{
|
|
const char *strtab;
|
|
|
|
strtab = (const char *) D_PTR(map,l_info[DT_STRTAB]);
|
|
_dl_error_printf ("\
|
|
%s: Symbol `%s' has different size in shared object, consider re-linking\n",
|
|
rtld_progname ?: "<program name unknown>",
|
|
strtab + refsym->st_name);
|
|
}
|
|
memcpy (reloc_addr_arg, (void *) value,
|
|
MIN (sym->st_size, refsym->st_size));
|
|
break;
|
|
# endif
|
|
case R_390_32:
|
|
*reloc_addr = value + reloc->r_addend;
|
|
break;
|
|
case R_390_16:
|
|
*(unsigned short *) reloc_addr = value + reloc->r_addend;
|
|
break;
|
|
case R_390_8:
|
|
*(char *) reloc_addr = value + reloc->r_addend;
|
|
break;
|
|
# ifndef RESOLVE_CONFLICT_FIND_MAP
|
|
case R_390_PC32:
|
|
*reloc_addr = value + reloc->r_addend - (Elf32_Addr) reloc_addr;
|
|
break;
|
|
case R_390_PC16DBL:
|
|
case R_390_PLT16DBL:
|
|
*(unsigned short *) reloc_addr = (unsigned short)
|
|
((short) (value + reloc->r_addend - (Elf32_Addr) reloc_addr) >> 1);
|
|
break;
|
|
case R_390_PC16:
|
|
*(unsigned short *) reloc_addr =
|
|
value + reloc->r_addend - (Elf32_Addr) reloc_addr;
|
|
break;
|
|
case R_390_NONE:
|
|
break;
|
|
# endif
|
|
#endif
|
|
#if !defined(RTLD_BOOTSTRAP) || defined(_NDEBUG)
|
|
default:
|
|
/* We add these checks in the version to relocate ld.so only
|
|
if we are still debugging. */
|
|
_dl_reloc_bad_type (map, r_type, 0);
|
|
break;
|
|
#endif
|
|
}
|
|
}
|
|
}
|
|
|
|
static inline void
|
|
elf_machine_rela_relative (Elf32_Addr l_addr, const Elf32_Rela *reloc,
|
|
void *const reloc_addr_arg)
|
|
{
|
|
Elf32_Addr *const reloc_addr = reloc_addr_arg;
|
|
*reloc_addr = l_addr + reloc->r_addend;
|
|
}
|
|
|
|
static inline void
|
|
elf_machine_lazy_rel (struct link_map *map,
|
|
Elf32_Addr l_addr, const Elf32_Rela *reloc)
|
|
{
|
|
Elf32_Addr *const reloc_addr = (void *) (l_addr + reloc->r_offset);
|
|
const unsigned int r_type = ELF32_R_TYPE (reloc->r_info);
|
|
/* Check for unexpected PLT reloc type. */
|
|
if (__builtin_expect (r_type == R_390_JMP_SLOT, 1))
|
|
{
|
|
if (__builtin_expect (map->l_mach.plt, 0) == 0)
|
|
*reloc_addr += l_addr;
|
|
else
|
|
*reloc_addr =
|
|
map->l_mach.plt
|
|
+ (((Elf32_Addr) reloc_addr) - map->l_mach.gotplt) * 8;
|
|
}
|
|
else
|
|
_dl_reloc_bad_type (map, r_type, 1);
|
|
}
|
|
|
|
#endif /* RESOLVE */
|