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/* Target-dependent code for HP PA-RISC BSD's.
Copyright (C) 2004-2021 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "objfiles.h"
#include "target.h"
#include "value.h"
#include "elf/common.h"
#include "hppa-tdep.h"
#include "hppa-bsd-tdep.h"
#include "dwarf2/frame.h"
#include "solib-svr4.h"
static CORE_ADDR
hppabsd_find_global_pointer (struct gdbarch *gdbarch, struct value *function)
{
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
CORE_ADDR faddr = value_as_address (function);
struct obj_section *faddr_sec;
/* Is this a plabel? If so, dereference it to get the Global Pointer
value. */
if (faddr & 2)
{
gdb_byte buf[4];
if (target_read_memory ((faddr & ~3) + 4, buf, sizeof buf) == 0)
return extract_unsigned_integer (buf, sizeof buf, byte_order);
}
/* If the address is in the .plt section, then the real function
hasn't yet been fixed up by the linker so we cannot determine the
Global Pointer for that function. */
if (in_plt_section (faddr))
return 0;
faddr_sec = find_pc_section (faddr);
if (faddr_sec != NULL)
{
struct obj_section *sec;
ALL_OBJFILE_OSECTIONS (faddr_sec->objfile, sec)
{
if (strcmp (sec->the_bfd_section->name, ".dynamic") == 0)
break;
}
if (sec < faddr_sec->objfile->sections_end)
{
CORE_ADDR addr = sec->addr ();
CORE_ADDR endaddr = sec->endaddr ();
while (addr < endaddr)
{
gdb_byte buf[4];
LONGEST tag;
if (target_read_memory (addr, buf, sizeof buf) != 0)
break;
tag = extract_signed_integer (buf, sizeof buf, byte_order);
if (tag == DT_PLTGOT)
{
CORE_ADDR pltgot;
if (target_read_memory (addr + 4, buf, sizeof buf) != 0)
break;
/* The NetBSD/OpenBSD ld.so doesn't relocate DT_PLTGOT, so
we have to do it ourselves. */
pltgot = extract_unsigned_integer (buf, sizeof buf,
byte_order);
pltgot += sec->objfile->text_section_offset ();
return pltgot;
}
if (tag == DT_NULL)
break;
addr += 8;
}
}
}
return 0;
}
static void
hppabsd_dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum,
struct dwarf2_frame_state_reg *reg,
struct frame_info *this_frame)
{
if (regnum == HPPA_PCOQ_HEAD_REGNUM)
reg->how = DWARF2_FRAME_REG_RA;
else if (regnum == HPPA_SP_REGNUM)
reg->how = DWARF2_FRAME_REG_CFA;
}
void
hppabsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
/* OpenBSD and NetBSD have a 64-bit 'long double'. */
set_gdbarch_long_double_bit (gdbarch, 64);
set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double);
/* OpenBSD and NetBSD use ELF. */
tdep->is_elf = 1;
tdep->find_global_pointer = hppabsd_find_global_pointer;
tdep->in_solib_call_trampoline = hppa_in_solib_call_trampoline;
set_gdbarch_skip_trampoline_code (gdbarch, hppa_skip_trampoline_code);
/* OpenBSD and NetBSD use SVR4-style shared libraries. */
set_solib_svr4_fetch_link_map_offsets
(gdbarch, svr4_ilp32_fetch_link_map_offsets);
/* Hook in the DWARF CFI frame unwinder. */
dwarf2_frame_set_init_reg (gdbarch, hppabsd_dwarf2_frame_init_reg);
dwarf2_append_unwinders (gdbarch);
}
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