mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-21 04:42:53 +08:00
142 lines
3.9 KiB
C
142 lines
3.9 KiB
C
/* Target-dependent code for HP PA-RISC BSD's.
|
||
|
||
Copyright (C) 2004-2016 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 "hppabsd-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;
|
||
gdb_byte buf[4];
|
||
|
||
/* Is this a plabel? If so, dereference it to get the Global Pointer
|
||
value. */
|
||
if (faddr & 2)
|
||
{
|
||
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 = obj_section_addr (sec);
|
||
CORE_ADDR endaddr = obj_section_endaddr (sec);
|
||
|
||
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 += ANOFFSET (sec->objfile->section_offsets,
|
||
SECT_OFF_TEXT (sec->objfile));
|
||
|
||
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);
|
||
}
|