520 lines
13 KiB
C
520 lines
13 KiB
C
/* Machine-dependent ELF dynamic relocation inline functions. SH version.
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Copyright (C) 1999, 2000 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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/* Only dummy. This doesn't work. */
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#define ELF_MACHINE_NAME "SH"
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#include <sys/param.h>
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#include <assert.h>
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/* Return nonzero iff ELF header is compatible with the running host. */
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static inline int __attribute__ ((unused))
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elf_machine_matches_host (const Elf32_Ehdr *ehdr)
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{
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return ehdr->e_machine == EM_SH;
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}
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/* Return the link-time address of _DYNAMIC. Conveniently, this is the
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first element of the GOT. This must be inlined in a function which
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uses global data. */
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static inline Elf32_Addr __attribute__ ((unused))
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elf_machine_dynamic (void)
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{
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register Elf32_Addr *got;
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asm ("mov r12,%0" :"=r" (got));
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return *got;
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}
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/* Return the run-time load address of the shared object. */
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static inline Elf32_Addr __attribute__ ((unused))
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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 ("mov.l .L1,r0
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mov.l .L3,r2
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add r12,r2
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mov.l @(r0,r12),r0
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bra .L2
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sub r0,r2
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.align 2
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.L1: .long _dl_start@GOT
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.L3: .long _dl_start@GOTOFF
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.L2: mov r2,%0"
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: "=r" (addr) : : "r0", "r1", "r2");
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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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Elf32_Addr *got;
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extern void _dl_runtime_resolve (Elf32_Word);
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extern void _dl_runtime_profile (Elf32_Word);
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if (l->l_info[DT_JMPREL] && lazy)
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{
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/* 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 load an
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offset into the .rela.plt section and _GLOBAL_OFFSET_TABLE_[1],
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and then jump to _GLOBAL_OFFSET_TABLE[2]. */
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got = (Elf32_Addr *) D_PTR (l, l_info[DT_PLTGOT]);
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got[1] = (Elf32_Addr) l; /* Identify this shared object. */
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/* The got[2] entry contains the address of a function which gets
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called to get the address of a so far unresolved function and
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jump to it. The profiling extension of the dynamic linker allows
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to intercept the calls to collect information. In this case we
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don't store the address in the GOT so that all future calls also
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end in this function. */
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if (profile)
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{
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got[2] = (Elf32_Addr) &_dl_runtime_profile;
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/* Say that we really want profiling and the timers are started. */
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_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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#define ELF_MACHINE_RUNTIME_FIXUP_ARGS int plt_type
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#ifdef SHARED
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#define FUN_ADDR "\
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mov.l 1f,r2
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mova 1f,r0
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bra 2f
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add r0,r2 ! Get GOT address in r2
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0: .align 2
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1: .long _GLOBAL_OFFSET_TABLE_
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2: mov.l 3f,r0
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add r2,r0"
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#define GOTJMP(x) #x "@GOTOFF"
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#else
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#define FUN_ADDR "\
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mov.l 3f,r0"
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#define GOTJMP(x) #x
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#endif
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#ifdef HAVE_FPU
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#define FGR_SAVE "\
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sts.l fpscr, @-r15
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mov #8,r3
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swap.w r3, r3
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lds r3, fpscr
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fmov.s fr11, @-r15
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fmov.s fr10, @-r15
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fmov.s fr9, @-r15
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fmov.s fr8, @-r15
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fmov.s fr7, @-r15
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fmov.s fr6, @-r15
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fmov.s fr5, @-r15
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fmov.s fr4, @-r15"
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#define FGR_LOAD "\
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fmov.s @r15+, fr4
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fmov.s @r15+, fr5
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fmov.s @r15+, fr6
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fmov.s @r15+, fr7
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fmov.s @r15+, fr8
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fmov.s @r15+, fr9
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fmov.s @r15+, fr10
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fmov.s @r15+, fr11
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lds.l @r15+, fpscr"
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#else
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#define FGR_SAVE ""
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#define FGR_LOAD ""
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#endif
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#ifndef PROF
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# define ELF_MACHINE_RUNTIME_TRAMPOLINE asm ("\
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.text
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.globl _dl_runtime_resolve
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.type _dl_runtime_resolve, @function
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.align 5
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_dl_runtime_resolve:
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mov.l r3,@-r15
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mov.l r4,@-r15
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mov.l r5,@-r15
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mov.l r6,@-r15
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mov.l r7,@-r15
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mov.l r12,@-r15
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movt r3 ! Save T flag.
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mov.l r3,@-r15
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" FGR_SAVE "
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sts.l pr,@-r15
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mov r0,r4 ! PLT type
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mov r2,r5 ! link map address
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" FUN_ADDR "
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jsr @r0 ! Call resolver.
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mov r1,r6 ! reloc offset
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lds.l @r15+,pr ! Get register content back.
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" FGR_LOAD "
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mov.l @r15+,r3
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shal r3 ! Lode T flag.
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mov.l @r15+,r12
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mov.l @r15+,r7
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mov.l @r15+,r6
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mov.l @r15+,r5
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mov.l @r15+,r4
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jmp @r0 ! Jump to function address.
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mov.l @r15+,r3
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.align 2
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3:
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.long " GOTJMP (fixup) "
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.size _dl_runtime_resolve, .-_dl_runtime_resolve
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.globl _dl_runtime_profile
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.type _dl_runtime_profile, @function
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.align 5
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_dl_runtime_profile:
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mov.l r3,@-r15
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mov.l r4,@-r15
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mov.l r5,@-r15
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mov.l r6,@-r15
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mov.l r7,@-r15
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mov.l r12,@-r15
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movt r3 ! Save T flag.
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mov.l r3,@-r15
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" FGR_SAVE "
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sts.l pr,@-r15
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mov r0,r4 ! PLT type
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mov r2,r5 ! link map address
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sts pr,r7 ! return address
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" FUN_ADDR "
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jsr @r0 ! Call resolver.
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mov r1,r6 ! reloc offset
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lds.l @r15+,pr ! Get register content back.
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" FGR_LOAD "
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mov.l @r15+,r3
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shal r3 ! Lode T flag.
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mov.l @r15+,r12
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mov.l @r15+,r7
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mov.l @r15+,r6
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mov.l @r15+,r5
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mov.l @r15+,r4
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jmp @r0 ! Jump to function address.
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mov.l @r15+,r3
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.align 2
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3:
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.long " GOTJMP (profile_fixup) "
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.size _dl_runtime_profile, .-_dl_runtime_profile
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.previous
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");
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#else
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# define ELF_MACHINE_RUNTIME_TRAMPOLINE asm ("\
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.text
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.globl _dl_runtime_resolve
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.globl _dl_runtime_profile
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.type _dl_runtime_resolve, @function
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.type _dl_runtime_profile, @function
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.align 5
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_dl_runtime_resolve:
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_dl_runtime_profile:
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mov.l r3,@-r15
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mov.l r4,@-r15
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mov.l r5,@-r15
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mov.l r6,@-r15
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mov.l r7,@-r15
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mov.l r12,@-r15
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movt r3 ! Save T flag.
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mov.l r3,@-r15
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" FGR_SAVE "
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sts.l pr,@-r15
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mov r0,r4 ! PLT type
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mov r2,r5 ! link map address
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sts pr,r7 ! return address
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" FUN_ADDR "
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jsr @r0 ! Call resolver.
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mov r1,r6 ! reloc offset
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lds.l @r15+,pr ! Get register content back.
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" FGR_LOAD "
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mov.l @r15+,r3
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shal r3 ! Lode T flag.
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mov.l @r15+,r12
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mov.l @r15+,r7
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mov.l @r15+,r6
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mov.l @r15+,r5
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mov.l @r15+,r4
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jmp @r0 ! Jump to function address.
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mov.l @r15+,r3
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.align 2
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3:
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.long " GOTJMP (fixup) "
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.size _dl_runtime_resolve, .-_dl_runtime_resolve
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.size _dl_runtime_profile, .-_dl_runtime_profile
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.previous
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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 0x80000000UL
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/* Initial entry point code for the dynamic linker.
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The C function `_dl_start' is the real entry point;
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its return value is the user program's entry point. */
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#define RTLD_START asm ("\
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.text\n\
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.globl _start\n\
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.globl _dl_start_user\n\
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_start:\n\
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mov r15,r4\n\
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mov.l .L_dl_start,r1\n\
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mova .L_dl_start,r0\n\
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add r1,r0\n\
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jsr @r0\n\
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nop\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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mov r0,r8\n\
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! Point r12 at the GOT.\n\
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mov.l 1f,r12\n\
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mova 1f,r0\n\
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bra 2f\n\
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add r0,r12\n\
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.align 2\n\
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1: .long _GLOBAL_OFFSET_TABLE_\n\
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2: ! Store the highest stack address\n\
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mov.l .L_stack_end,r0\n\
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mov.l @(r0,r12),r0\n\
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mov.l r15,@r0\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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mov.l .L_dl_skip_args,r0\n\
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mov.l @(r0,r12),r0\n\
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mov.l @r0,r0\n\
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! Get the original argument count.\n\
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mov.l @r15,r5\n\
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! Subtract _dl_skip_args from it.\n\
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sub r0,r5\n\
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! Adjust the stack pointer to skip _dl_skip_args words.\n\
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shll2 r0\n\
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add r0,r15\n\
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! Store back the modified argument count.\n\
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mov.l r5,@r15\n\
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! Compute argv address and envp.\n\
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mov r15,r6\n\
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add #4,r6\n\
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mov r5,r7\n\
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shll2 r7\n\
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add r15,r7\n\
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mov.l .L_dl_loaded,r0\n\
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mov.l @(r0,r12),r0\n\
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mov.l @r0,r4\n\
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! Call _dl_init.\n\
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mov.l .L_dl_init,r1\n\
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mova .L_dl_init,r0\n\
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add r1,r0\n\
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jsr @r0\n\
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nop\n\
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1: ! Clear the startup flag.\n\
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mov.l .L_dl_starting_up,r0\n\
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mov.l @(r0,r12),r0\n\
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mov #0,r2\n\
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mov.l r2,@r0\n\
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! Pass our finalizer function to the user in r4, as per ELF ABI.\n\
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mov.l .L_dl_fini,r0\n\
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mov.l @(r0,r12),r4\n\
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! Jump to the user's entry point.\n\
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jmp @r8\n\
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nop\n\
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.align 2\n\
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.L_dl_start:\n\
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.long _dl_start@PLT\n\
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.L_stack_end:\n\
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.long __libc_stack_end@GOT\n\
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.L_dl_skip_args:\n\
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.long _dl_skip_args@GOT\n\
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.L_dl_init:\n\
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.long _dl_init@PLT\n\
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.L_dl_loaded:\n\
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.long _dl_loaded@GOT\n\
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.L_dl_starting_up:\n\
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.long _dl_starting_up@GOT\n\
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.L_dl_fini:\n\
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.long _dl_fini@GOT\n\
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.previous\n\
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");
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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_SH_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_SH_JMP_SLOT)
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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_SH_JMP_SLOT
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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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extern const char *_dl_platform;
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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 (_dl_platform != NULL && *_dl_platform == '\0')
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/* Avoid an empty string which would disturb us. */
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_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 + reloc->r_addend;
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}
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#endif /* !dl_machine_h */
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#ifdef RESOLVE
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/* SH never uses Elf32_Rel relocations. */
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#define ELF_MACHINE_NO_REL 1
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extern char **_dl_argv;
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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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Elf32_Addr *const reloc_addr)
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{
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if (ELF32_R_TYPE (reloc->r_info) == R_SH_RELATIVE)
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{
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#ifndef RTLD_BOOTSTRAP
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if (map != &_dl_rtld_map) /* Already done in rtld itself. */
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#endif
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{
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if (reloc->r_addend)
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*reloc_addr = map->l_addr + reloc->r_addend;
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else
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*reloc_addr += map->l_addr;
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}
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}
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else if (ELF32_R_TYPE (reloc->r_info) != R_SH_NONE)
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{
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const Elf32_Sym *const refsym = sym;
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Elf32_Addr value = RESOLVE (&sym, version, ELF32_R_TYPE (reloc->r_info));
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if (sym)
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value += sym->st_value;
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value += reloc->r_addend;
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switch (ELF32_R_TYPE (reloc->r_info))
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{
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case R_SH_COPY:
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if (sym == NULL)
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/* This can happen in trace mode if an object could not be
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found. */
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break;
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if (sym->st_size > refsym->st_size
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|| (sym->st_size < refsym->st_size && _dl_verbose))
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{
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const char *strtab;
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strtab = (const char *) D_PTR (map, l_info[DT_STRTAB]);
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_dl_sysdep_error (_dl_argv[0] ?: "<program name unknown>",
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": Symbol `", strtab + refsym->st_name,
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"' has different size in shared object, "
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"consider re-linking\n", NULL);
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}
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memcpy (reloc_addr, (void *) value, MIN (sym->st_size,
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refsym->st_size));
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break;
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case R_SH_GLOB_DAT:
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case R_SH_JMP_SLOT:
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*reloc_addr = value;
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break;
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case R_SH_DIR32:
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{
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#ifndef RTLD_BOOTSTRAP
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/* This is defined in rtld.c, but nowhere in the static
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libc.a; make the reference weak so static programs can
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still link. This declaration cannot be done when
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compiling rtld.c (i.e. #ifdef RTLD_BOOTSTRAP) because
|
|
rtld.c contains the common defn for _dl_rtld_map, which
|
|
is incompatible with a weak decl in the same file. */
|
|
weak_extern (_dl_rtld_map);
|
|
if (map == &_dl_rtld_map)
|
|
/* Undo the relocation done here during bootstrapping.
|
|
Now we will relocate it anew, possibly using a
|
|
binding found in the user program or a loaded library
|
|
rather than the dynamic linker's built-in definitions
|
|
used while loading those libraries. */
|
|
value -= map->l_addr + refsym->st_value + reloc->r_addend;
|
|
#endif
|
|
*reloc_addr = value;
|
|
break;
|
|
}
|
|
case R_SH_REL32:
|
|
*reloc_addr = (value - (Elf32_Addr) reloc_addr);
|
|
break;
|
|
default:
|
|
_dl_reloc_bad_type (map, ELF32_R_TYPE (reloc->r_info), 0);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
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);
|
|
/* Check for unexpected PLT reloc type. */
|
|
if (ELF32_R_TYPE (reloc->r_info) == R_SH_JMP_SLOT)
|
|
*reloc_addr += l_addr;
|
|
else
|
|
_dl_reloc_bad_type (map, ELF32_R_TYPE (reloc->r_info), 1);
|
|
}
|
|
|
|
#endif /* RESOLVE */
|