466 lines
14 KiB
C
466 lines
14 KiB
C
/* Machine-dependent ELF dynamic relocation inline functions. SH version.
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Copyright (C) 1999-2013 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<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 "SH"
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#include <sys/param.h>
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#include <sysdep.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 1f,r0\n\
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mov.l 3f,r2\n\
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add r12,r2\n\
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mov.l @(r0,r12),r0\n\
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bra 2f\n\
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sub r0,r2\n\
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.align 2\n\
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1: .long _dl_start@GOT\n\
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3: .long _dl_start@GOTOFF\n\
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2: 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, always_inline))
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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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/* 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 + 36. */
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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 (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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if (GLRO(dl_profile) != NULL
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&& _dl_name_match_p (GLRO(dl_profile), l))
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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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#define ELF_MACHINE_RUNTIME_FIXUP_ARGS int plt_type
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#define ELF_MACHINE_RUNTIME_FIXUP_PARAMS plt_type
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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: ! 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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add #8,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: ! 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_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_internal@PLT\n\
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.L_dl_loaded:\n\
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.long _rtld_local@GOT\n\
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.L_dl_fini:\n\
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.long _dl_fini@GOT\n\
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.type __fpscr_values,@object\n\
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.global __fpscr_values\n\
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__fpscr_values:\n\
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.long 0\n\
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.long 0x80000\n\
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.weak __fpscr_values\n\
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.previous\n\
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");
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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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#define elf_machine_type_class(type) \
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((((type) == R_SH_JMP_SLOT || (type) == R_SH_TLS_DTPMOD32 \
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|| (type) == R_SH_TLS_DTPOFF32 || (type) == R_SH_TLS_TPOFF32) \
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* ELF_RTYPE_CLASS_PLT) \
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| (((type) == R_SH_COPY) * ELF_RTYPE_CLASS_COPY))
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/* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */
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#define ELF_MACHINE_JMP_SLOT R_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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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 + reloc->r_addend;
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}
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#define ARCH_LA_PLTENTER sh_gnu_pltenter
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#define ARCH_LA_PLTEXIT sh_gnu_pltexit
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#endif /* !dl_machine_h */
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/* SH never uses Elf32_Rel relocations. */
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#define ELF_MACHINE_NO_REL 1
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#ifdef RESOLVE_MAP
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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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auto inline void
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__attribute ((always_inline))
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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, int skip_ifunc)
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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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Elf32_Addr value;
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#define COPY_UNALIGNED_WORD(swp, twp, align) \
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{ \
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void *__s = (swp), *__t = (twp); \
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unsigned char *__s1 = __s, *__t1 = __t; \
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unsigned short *__s2 = __s, *__t2 = __t; \
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unsigned long *__s4 = __s, *__t4 = __t; \
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switch ((align)) \
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{ \
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case 0: \
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*__t4 = *__s4; \
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break; \
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case 2: \
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*__t2++ = *__s2++; \
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*__t2 = *__s2; \
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break; \
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default: \
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*__t1++ = *__s1++; \
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*__t1++ = *__s1++; \
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*__t1++ = *__s1++; \
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*__t1 = *__s1; \
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break; \
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} \
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}
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if (__builtin_expect (r_type == R_SH_RELATIVE, 0))
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{
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#ifndef RTLD_BOOTSTRAP
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if (map != &GL(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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value = map->l_addr + reloc->r_addend;
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else
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{
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COPY_UNALIGNED_WORD (reloc_addr_arg, &value,
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(int) reloc_addr_arg & 3);
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value += map->l_addr;
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}
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COPY_UNALIGNED_WORD (&value, reloc_addr_arg,
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(int) reloc_addr_arg & 3);
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}
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}
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#ifndef RTLD_BOOTSTRAP
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else if (__builtin_expect (r_type == R_SH_NONE, 0))
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return;
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#endif
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else
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{
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const Elf32_Sym *const refsym = sym;
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struct link_map *sym_map = RESOLVE_MAP (&sym, version, r_type);
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value = sym_map == NULL ? 0 : sym_map->l_addr + sym->st_value;
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value += reloc->r_addend;
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switch (r_type)
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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 && GLRO(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_error_printf ("\
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%s: Symbol `%s' has different size in shared object, consider re-linking\n",
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RTLD_PROGNAME, strtab + refsym->st_name);
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}
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memcpy (reloc_addr_arg, (void *) value,
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MIN (sym->st_size, 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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/* These addresses are always aligned. */
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*reloc_addr = value;
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break;
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/* XXX Remove TLS relocations which are not needed. */
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case R_SH_TLS_DTPMOD32:
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#ifdef RTLD_BOOTSTRAP
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/* During startup the dynamic linker is always the module
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with index 1.
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XXX If this relocation is necessary move before RESOLVE
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call. */
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*reloc_addr = 1;
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#else
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/* Get the information from the link map returned by the
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resolv function. */
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if (sym_map != NULL)
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*reloc_addr = sym_map->l_tls_modid;
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#endif
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break;
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case R_SH_TLS_DTPOFF32:
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#ifndef RTLD_BOOTSTRAP
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/* During relocation all TLS symbols are defined and used.
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Therefore the offset is already correct. */
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if (sym != NULL)
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*reloc_addr = sym->st_value;
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#endif
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break;
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case R_SH_TLS_TPOFF32:
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/* The offset is positive, afterward from the thread pointer. */
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#ifdef RTLD_BOOTSTRAP
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*reloc_addr = map->l_tls_offset + sym->st_value + reloc->r_addend;
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#else
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/* We know the offset of object the symbol is contained in.
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It is a positive value which will be added to the thread
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pointer. To get the variable position in the TLS block
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we add the offset from that of the TLS block. */
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if (sym != NULL)
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{
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CHECK_STATIC_TLS (map, sym_map);
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*reloc_addr = sym_map->l_tls_offset + sym->st_value
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+ reloc->r_addend;
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}
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#endif
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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
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rtld.c contains the common defn for _dl_rtld_map, which
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is incompatible with a weak decl in the same file. */
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# ifndef SHARED
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weak_extern (_dl_rtld_map);
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# endif
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if (map == &GL(dl_rtld_map))
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/* Undo the relocation done here during bootstrapping.
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Now we will relocate it anew, possibly using a
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binding found in the user program or a loaded library
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rather than the dynamic linker's built-in definitions
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used while loading those libraries. */
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value -= map->l_addr + refsym->st_value + reloc->r_addend;
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#endif
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COPY_UNALIGNED_WORD (&value, reloc_addr_arg,
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(int) reloc_addr_arg & 3);
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break;
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}
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case R_SH_REL32:
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value = (value - (Elf32_Addr) reloc_addr);
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COPY_UNALIGNED_WORD (&value, reloc_addr_arg,
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(int) reloc_addr_arg & 3);
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break;
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default:
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_dl_reloc_bad_type (map, r_type, 0);
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break;
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}
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}
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}
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auto inline void
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__attribute__ ((always_inline))
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elf_machine_rela_relative (Elf32_Addr l_addr, const Elf32_Rela *reloc,
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void *const reloc_addr_arg)
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{
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Elf32_Addr value;
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if (reloc->r_addend)
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value = l_addr + reloc->r_addend;
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else
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{
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COPY_UNALIGNED_WORD (reloc_addr_arg, &value, (int) reloc_addr_arg & 3);
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value += l_addr;
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}
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COPY_UNALIGNED_WORD (&value, reloc_addr_arg, (int) reloc_addr_arg & 3);
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#undef COPY_UNALIGNED_WORD
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}
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auto inline void
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__attribute__ ((always_inline))
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elf_machine_lazy_rel (struct link_map *map,
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Elf32_Addr l_addr, const Elf32_Rela *reloc,
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int skip_ifunc)
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{
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Elf32_Addr *const reloc_addr = (void *) (l_addr + reloc->r_offset);
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/* Check for unexpected PLT reloc type. */
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if (ELF32_R_TYPE (reloc->r_info) == R_SH_JMP_SLOT)
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{
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if (__builtin_expect (map->l_mach.plt, 0) == 0)
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*reloc_addr += l_addr;
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else
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*reloc_addr =
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map->l_mach.plt
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+ (((Elf32_Addr) reloc_addr) - map->l_mach.gotplt) * 7;
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}
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else
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_dl_reloc_bad_type (map, ELF32_R_TYPE (reloc->r_info), 1);
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}
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#endif /* RESOLVE_MAP */
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