| /* 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); |
| } |