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- /* Target-dependent code for HP PA-RISC BSD's.
- Copyright (C) 2004-2022 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, 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)
- {
- hppa_gdbarch_tdep *tdep = (hppa_gdbarch_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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