| 1 | /* Target-dependent code for HP PA-RISC BSD's. |
| 2 | |
| 3 | Copyright (C) 2004, 2005, 2006, 2007 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include "arch-utils.h" |
| 22 | #include "gdbtypes.h" |
| 23 | #include "symtab.h" |
| 24 | #include "objfiles.h" |
| 25 | #include "osabi.h" |
| 26 | #include "regcache.h" |
| 27 | #include "regset.h" |
| 28 | #include "target.h" |
| 29 | #include "value.h" |
| 30 | |
| 31 | #include "gdb_assert.h" |
| 32 | #include "gdb_string.h" |
| 33 | |
| 34 | #include "elf/common.h" |
| 35 | |
| 36 | #include "hppa-tdep.h" |
| 37 | #include "solib-svr4.h" |
| 38 | |
| 39 | /* Core file support. */ |
| 40 | |
| 41 | /* Sizeof `struct reg' in <machine/reg.h>. */ |
| 42 | #define HPPABSD_SIZEOF_GREGS (34 * 4) |
| 43 | |
| 44 | /* Supply register REGNUM from the buffer specified by GREGS and LEN |
| 45 | in the general-purpose register set REGSET to register cache |
| 46 | REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ |
| 47 | |
| 48 | static void |
| 49 | hppabsd_supply_gregset (const struct regset *regset, struct regcache *regcache, |
| 50 | int regnum, const void *gregs, size_t len) |
| 51 | { |
| 52 | const gdb_byte *regs = gregs; |
| 53 | size_t offset; |
| 54 | int i; |
| 55 | |
| 56 | gdb_assert (len >= HPPABSD_SIZEOF_GREGS); |
| 57 | |
| 58 | for (i = HPPA_R1_REGNUM, offset = 4; i <= HPPA_R31_REGNUM; i++, offset += 4) |
| 59 | { |
| 60 | if (regnum == -1 || regnum == i) |
| 61 | regcache_raw_supply (regcache, i, regs + offset); |
| 62 | } |
| 63 | |
| 64 | if (regnum == -1 || regnum == HPPA_SAR_REGNUM) |
| 65 | regcache_raw_supply (regcache, HPPA_SAR_REGNUM, regs); |
| 66 | if (regnum == -1 || regnum == HPPA_PCOQ_HEAD_REGNUM) |
| 67 | regcache_raw_supply (regcache, HPPA_PCOQ_HEAD_REGNUM, regs + 32 * 4); |
| 68 | if (regnum == -1 || regnum == HPPA_PCOQ_TAIL_REGNUM) |
| 69 | regcache_raw_supply (regcache, HPPA_PCOQ_TAIL_REGNUM, regs + 33 * 4); |
| 70 | } |
| 71 | |
| 72 | /* OpenBSD/hppa register set. */ |
| 73 | |
| 74 | static struct regset hppabsd_gregset = |
| 75 | { |
| 76 | NULL, |
| 77 | hppabsd_supply_gregset |
| 78 | }; |
| 79 | |
| 80 | /* Return the appropriate register set for the core section identified |
| 81 | by SECT_NAME and SECT_SIZE. */ |
| 82 | |
| 83 | static const struct regset * |
| 84 | hppabsd_regset_from_core_section (struct gdbarch *gdbarch, |
| 85 | const char *sect_name, size_t sect_size) |
| 86 | { |
| 87 | if (strcmp (sect_name, ".reg") == 0 && sect_size >= HPPABSD_SIZEOF_GREGS) |
| 88 | return &hppabsd_gregset; |
| 89 | |
| 90 | return NULL; |
| 91 | } |
| 92 | \f |
| 93 | |
| 94 | CORE_ADDR |
| 95 | hppabsd_find_global_pointer (struct value *function) |
| 96 | { |
| 97 | CORE_ADDR faddr = value_as_address (function); |
| 98 | struct obj_section *faddr_sec; |
| 99 | gdb_byte buf[4]; |
| 100 | |
| 101 | /* Is this a plabel? If so, dereference it to get the Global Pointer |
| 102 | value. */ |
| 103 | if (faddr & 2) |
| 104 | { |
| 105 | if (target_read_memory ((faddr & ~3) + 4, buf, sizeof buf) == 0) |
| 106 | return extract_unsigned_integer (buf, sizeof buf); |
| 107 | } |
| 108 | |
| 109 | /* If the address is in the .plt section, then the real function |
| 110 | hasn't yet been fixed up by the linker so we cannot determine the |
| 111 | Global Pointer for that function. */ |
| 112 | if (in_plt_section (faddr, NULL)) |
| 113 | return 0; |
| 114 | |
| 115 | faddr_sec = find_pc_section (faddr); |
| 116 | if (faddr_sec != NULL) |
| 117 | { |
| 118 | struct obj_section *sec; |
| 119 | |
| 120 | ALL_OBJFILE_OSECTIONS (faddr_sec->objfile, sec) |
| 121 | { |
| 122 | if (strcmp (sec->the_bfd_section->name, ".dynamic") == 0) |
| 123 | break; |
| 124 | } |
| 125 | |
| 126 | if (sec < faddr_sec->objfile->sections_end) |
| 127 | { |
| 128 | CORE_ADDR addr = sec->addr; |
| 129 | |
| 130 | while (addr < sec->endaddr) |
| 131 | { |
| 132 | gdb_byte buf[4]; |
| 133 | LONGEST tag; |
| 134 | |
| 135 | if (target_read_memory (addr, buf, sizeof buf) != 0) |
| 136 | break; |
| 137 | |
| 138 | tag = extract_signed_integer (buf, sizeof buf); |
| 139 | if (tag == DT_PLTGOT) |
| 140 | { |
| 141 | CORE_ADDR pltgot; |
| 142 | |
| 143 | if (target_read_memory (addr + 4, buf, sizeof buf) != 0) |
| 144 | break; |
| 145 | |
| 146 | /* The OpenBSD ld.so doesn't relocate DT_PLTGOT, so |
| 147 | we have to do it ourselves. */ |
| 148 | pltgot = extract_unsigned_integer (buf, sizeof buf); |
| 149 | pltgot += ANOFFSET (sec->objfile->section_offsets, |
| 150 | SECT_OFF_TEXT (sec->objfile)); |
| 151 | return pltgot; |
| 152 | } |
| 153 | |
| 154 | if (tag == DT_NULL) |
| 155 | break; |
| 156 | |
| 157 | addr += 8; |
| 158 | } |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | return 0; |
| 163 | } |
| 164 | \f |
| 165 | |
| 166 | static void |
| 167 | hppabsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 168 | { |
| 169 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 170 | |
| 171 | /* OpenBSD and NetBSD have a 64-bit 'long double'. */ |
| 172 | set_gdbarch_long_double_bit (gdbarch, 64); |
| 173 | set_gdbarch_long_double_format (gdbarch, floatformats_ieee_double); |
| 174 | |
| 175 | /* Core file support. */ |
| 176 | set_gdbarch_regset_from_core_section |
| 177 | (gdbarch, hppabsd_regset_from_core_section); |
| 178 | |
| 179 | /* OpenBSD and NetBSD use ELF. */ |
| 180 | tdep->is_elf = 1; |
| 181 | tdep->find_global_pointer = hppabsd_find_global_pointer; |
| 182 | tdep->in_solib_call_trampoline = hppa_in_solib_call_trampoline; |
| 183 | set_gdbarch_skip_trampoline_code (gdbarch, hppa_skip_trampoline_code); |
| 184 | |
| 185 | /* OpenBSD and NetBSD use SVR4-style shared libraries. */ |
| 186 | set_solib_svr4_fetch_link_map_offsets |
| 187 | (gdbarch, svr4_ilp32_fetch_link_map_offsets); |
| 188 | } |
| 189 | \f |
| 190 | |
| 191 | /* OpenBSD uses uses the traditional NetBSD core file format, even for |
| 192 | ports that use ELF. */ |
| 193 | #define GDB_OSABI_NETBSD_CORE GDB_OSABI_OPENBSD_ELF |
| 194 | |
| 195 | static enum gdb_osabi |
| 196 | hppabsd_core_osabi_sniffer (bfd *abfd) |
| 197 | { |
| 198 | if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0) |
| 199 | return GDB_OSABI_NETBSD_CORE; |
| 200 | |
| 201 | return GDB_OSABI_UNKNOWN; |
| 202 | } |
| 203 | \f |
| 204 | |
| 205 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 206 | void _initialize_hppabsd_tdep (void); |
| 207 | |
| 208 | void |
| 209 | _initialize_hppabsd_tdep (void) |
| 210 | { |
| 211 | /* BFD doesn't set a flavour for NetBSD style a.out core files. */ |
| 212 | gdbarch_register_osabi_sniffer (bfd_arch_hppa, bfd_target_unknown_flavour, |
| 213 | hppabsd_core_osabi_sniffer); |
| 214 | |
| 215 | gdbarch_register_osabi (bfd_arch_hppa, 0, GDB_OSABI_NETBSD_ELF, |
| 216 | hppabsd_init_abi); |
| 217 | gdbarch_register_osabi (bfd_arch_hppa, 0, GDB_OSABI_OPENBSD_ELF, |
| 218 | hppabsd_init_abi); |
| 219 | } |