| 1 | /* Target-dependent code for HP PA-RISC BSD's. |
| 2 | |
| 3 | Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
| 4 | Free Software Foundation, Inc. |
| 5 | |
| 6 | This file is part of GDB. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 3 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 20 | |
| 21 | #include "defs.h" |
| 22 | #include "objfiles.h" |
| 23 | #include "target.h" |
| 24 | #include "value.h" |
| 25 | |
| 26 | #include "elf/common.h" |
| 27 | |
| 28 | #include "hppa-tdep.h" |
| 29 | #include "hppabsd-tdep.h" |
| 30 | #include "solib-svr4.h" |
| 31 | |
| 32 | static CORE_ADDR |
| 33 | hppabsd_find_global_pointer (struct gdbarch *gdbarch, struct value *function) |
| 34 | { |
| 35 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 36 | CORE_ADDR faddr = value_as_address (function); |
| 37 | struct obj_section *faddr_sec; |
| 38 | gdb_byte buf[4]; |
| 39 | |
| 40 | /* Is this a plabel? If so, dereference it to get the Global Pointer |
| 41 | value. */ |
| 42 | if (faddr & 2) |
| 43 | { |
| 44 | if (target_read_memory ((faddr & ~3) + 4, buf, sizeof buf) == 0) |
| 45 | return extract_unsigned_integer (buf, sizeof buf, byte_order); |
| 46 | } |
| 47 | |
| 48 | /* If the address is in the .plt section, then the real function |
| 49 | hasn't yet been fixed up by the linker so we cannot determine the |
| 50 | Global Pointer for that function. */ |
| 51 | if (in_plt_section (faddr, NULL)) |
| 52 | return 0; |
| 53 | |
| 54 | faddr_sec = find_pc_section (faddr); |
| 55 | if (faddr_sec != NULL) |
| 56 | { |
| 57 | struct obj_section *sec; |
| 58 | |
| 59 | ALL_OBJFILE_OSECTIONS (faddr_sec->objfile, sec) |
| 60 | { |
| 61 | if (strcmp (sec->the_bfd_section->name, ".dynamic") == 0) |
| 62 | break; |
| 63 | } |
| 64 | |
| 65 | if (sec < faddr_sec->objfile->sections_end) |
| 66 | { |
| 67 | CORE_ADDR addr = obj_section_addr (sec); |
| 68 | CORE_ADDR endaddr = obj_section_endaddr (sec); |
| 69 | |
| 70 | while (addr < endaddr) |
| 71 | { |
| 72 | gdb_byte buf[4]; |
| 73 | LONGEST tag; |
| 74 | |
| 75 | if (target_read_memory (addr, buf, sizeof buf) != 0) |
| 76 | break; |
| 77 | |
| 78 | tag = extract_signed_integer (buf, sizeof buf, byte_order); |
| 79 | if (tag == DT_PLTGOT) |
| 80 | { |
| 81 | CORE_ADDR pltgot; |
| 82 | |
| 83 | if (target_read_memory (addr + 4, buf, sizeof buf) != 0) |
| 84 | break; |
| 85 | |
| 86 | /* The NetBSD/OpenBSD ld.so doesn't relocate DT_PLTGOT, so |
| 87 | we have to do it ourselves. */ |
| 88 | pltgot = extract_unsigned_integer (buf, sizeof buf, |
| 89 | byte_order); |
| 90 | pltgot += ANOFFSET (sec->objfile->section_offsets, |
| 91 | SECT_OFF_TEXT (sec->objfile)); |
| 92 | |
| 93 | return pltgot; |
| 94 | } |
| 95 | |
| 96 | if (tag == DT_NULL) |
| 97 | break; |
| 98 | |
| 99 | addr += 8; |
| 100 | } |
| 101 | } |
| 102 | } |
| 103 | |
| 104 | return 0; |
| 105 | } |
| 106 | \f |
| 107 | |
| 108 | void |
| 109 | hppabsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 110 | { |
| 111 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 112 | |
| 113 | /* OpenBSD and NetBSD have a 64-bit 'long double'. */ |
| 114 | set_gdbarch_long_double_bit (gdbarch, 64); |
| 115 | set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double); |
| 116 | |
| 117 | /* OpenBSD and NetBSD use ELF. */ |
| 118 | tdep->is_elf = 1; |
| 119 | tdep->find_global_pointer = hppabsd_find_global_pointer; |
| 120 | tdep->in_solib_call_trampoline = hppa_in_solib_call_trampoline; |
| 121 | set_gdbarch_skip_trampoline_code (gdbarch, hppa_skip_trampoline_code); |
| 122 | |
| 123 | /* OpenBSD and NetBSD use SVR4-style shared libraries. */ |
| 124 | set_solib_svr4_fetch_link_map_offsets |
| 125 | (gdbarch, svr4_ilp32_fetch_link_map_offsets); |
| 126 | } |