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https://github.com/openharmony/third_party_elfutils.git
synced 2026-07-20 03:53:42 -04:00
Mark Wielaard
c1c1c06e30
The ARM EABI says that the zero bit of function symbol st_value indicates whether the symbol points to a THUMB or ARM function. Also the return value address in an unwind will contain the same extra bit to indicate whether to return to a regular ARM or THUMB function. Add a new ebl function to mask off such bits and turn a function value into a function address so that we get the actual value that a function symbol or return address points to. It isn't easily possible to reuse the existing ebl_resolve_sym_value for this purpose, so we end up with another hook that can be used from dwfl_module_getsym, handle_cfi and elflint. Signed-off-by: Mark Wielaard <mjw@redhat.com>
77 lines
2.2 KiB
C
77 lines
2.2 KiB
C
/* Initialization of Arm specific backend library.
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Copyright (C) 2002, 2005, 2009, 2013, 2014 Red Hat, Inc.
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This file is part of elfutils.
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Written by Ulrich Drepper <drepper@redhat.com>, 2002.
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This file is free software; you can redistribute it and/or modify
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it under the terms of either
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at
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your option) any later version
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at
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your option) any later version
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or both in parallel, as here.
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elfutils is distributed in the hope that it will be useful, but
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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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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see <http://www.gnu.org/licenses/>. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#define BACKEND arm_
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#define RELOC_PREFIX R_ARM_
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#include "libebl_CPU.h"
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/* This defines the common reloc hooks based on arm_reloc.def. */
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#include "common-reloc.c"
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const char *
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arm_init (elf, machine, eh, ehlen)
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Elf *elf __attribute__ ((unused));
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GElf_Half machine __attribute__ ((unused));
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Ebl *eh;
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size_t ehlen;
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{
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/* Check whether the Elf_BH object has a sufficent size. */
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if (ehlen < sizeof (Ebl))
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return NULL;
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/* We handle it. */
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eh->name = "ARM";
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arm_init_reloc (eh);
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HOOK (eh, segment_type_name);
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HOOK (eh, section_type_name);
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HOOK (eh, machine_flag_check);
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HOOK (eh, reloc_simple_type);
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HOOK (eh, register_info);
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HOOK (eh, core_note);
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HOOK (eh, auxv_info);
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HOOK (eh, check_object_attribute);
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HOOK (eh, return_value_location);
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HOOK (eh, abi_cfi);
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HOOK (eh, check_reloc_target_type);
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/* We only unwind the core integer registers. */
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eh->frame_nregs = 16;
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HOOK (eh, set_initial_registers_tid);
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/* Bit zero encodes whether an function address is THUMB or ARM. */
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eh->func_addr_mask = ~(GElf_Addr)1;
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return MODVERSION;
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}
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