diff options
Diffstat (limited to 'gdb/hppa-bsd-tdep.c')
| -rw-r--r-- | gdb/hppa-bsd-tdep.c | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/gdb/hppa-bsd-tdep.c b/gdb/hppa-bsd-tdep.c new file mode 100644 index 0000000..2c581c4 --- /dev/null +++ b/gdb/hppa-bsd-tdep.c @@ -0,0 +1,141 @@ +/* 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 "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; + 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); +} |