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138 lines
3.8 KiB
C
138 lines
3.8 KiB
C
/* Target-dependent code for HP PA-RISC BSD's.
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Copyright (C) 2004-2023 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "objfiles.h"
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#include "target.h"
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#include "value.h"
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#include "elf/common.h"
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#include "hppa-tdep.h"
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#include "hppa-bsd-tdep.h"
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#include "dwarf2/frame.h"
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#include "solib-svr4.h"
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static CORE_ADDR
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hppabsd_find_global_pointer (struct gdbarch *gdbarch, struct value *function)
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{
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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CORE_ADDR faddr = value_as_address (function);
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struct obj_section *faddr_sec;
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/* Is this a plabel? If so, dereference it to get the Global Pointer
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value. */
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if (faddr & 2)
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{
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gdb_byte buf[4];
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if (target_read_memory ((faddr & ~3) + 4, buf, sizeof buf) == 0)
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return extract_unsigned_integer (buf, sizeof buf, byte_order);
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}
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/* If the address is in the .plt section, then the real function
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hasn't yet been fixed up by the linker so we cannot determine the
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Global Pointer for that function. */
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if (in_plt_section (faddr))
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return 0;
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faddr_sec = find_pc_section (faddr);
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if (faddr_sec != NULL)
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{
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for (struct obj_section *sec : faddr_sec->objfile->sections ())
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{
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if (strcmp (sec->the_bfd_section->name, ".dynamic") == 0)
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{
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CORE_ADDR addr = sec->addr ();
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CORE_ADDR endaddr = sec->endaddr ();
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while (addr < endaddr)
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{
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gdb_byte buf[4];
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LONGEST tag;
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if (target_read_memory (addr, buf, sizeof buf) != 0)
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break;
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tag = extract_signed_integer (buf, byte_order);
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if (tag == DT_PLTGOT)
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{
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CORE_ADDR pltgot;
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if (target_read_memory (addr + 4, buf, sizeof buf) != 0)
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break;
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/* The NetBSD/OpenBSD ld.so doesn't relocate
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DT_PLTGOT, so we have to do it ourselves. */
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pltgot = extract_unsigned_integer (buf, sizeof buf,
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byte_order);
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pltgot += sec->objfile->text_section_offset ();
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return pltgot;
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}
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if (tag == DT_NULL)
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break;
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addr += 8;
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}
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break;
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}
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}
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}
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return 0;
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}
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static void
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hppabsd_dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum,
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struct dwarf2_frame_state_reg *reg,
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frame_info_ptr this_frame)
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{
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if (regnum == HPPA_PCOQ_HEAD_REGNUM)
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reg->how = DWARF2_FRAME_REG_RA;
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else if (regnum == HPPA_SP_REGNUM)
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reg->how = DWARF2_FRAME_REG_CFA;
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}
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void
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hppabsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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hppa_gdbarch_tdep *tdep = gdbarch_tdep<hppa_gdbarch_tdep> (gdbarch);
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/* OpenBSD and NetBSD have a 64-bit 'long double'. */
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set_gdbarch_long_double_bit (gdbarch, 64);
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set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double);
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/* OpenBSD and NetBSD use ELF. */
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tdep->is_elf = 1;
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tdep->find_global_pointer = hppabsd_find_global_pointer;
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tdep->in_solib_call_trampoline = hppa_in_solib_call_trampoline;
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set_gdbarch_skip_trampoline_code (gdbarch, hppa_skip_trampoline_code);
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/* OpenBSD and NetBSD use SVR4-style shared libraries. */
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set_solib_svr4_fetch_link_map_offsets
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(gdbarch, svr4_ilp32_fetch_link_map_offsets);
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/* Hook in the DWARF CFI frame unwinder. */
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dwarf2_frame_set_init_reg (gdbarch, hppabsd_dwarf2_frame_init_reg);
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dwarf2_append_unwinders (gdbarch);
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}
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