/* Target-dependent code for HP PA-RISC BSD's. Copyright (C) 2004-2012 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 "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, NULL)) 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; } 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); }