| 1 | /* Target-dependent code for OpenBSD/powerpc. |
| 2 | |
| 3 | Copyright 2004 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 2 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, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 20 | Boston, MA 02111-1307, USA. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "arch-utils.h" |
| 24 | #include "osabi.h" |
| 25 | #include "regcache.h" |
| 26 | #include "regset.h" |
| 27 | #include "gdb_assert.h" |
| 28 | |
| 29 | #include "gdb_string.h" |
| 30 | |
| 31 | #include "ppc-tdep.h" |
| 32 | #include "ppcobsd-tdep.h" |
| 33 | #include "solib-svr4.h" |
| 34 | |
| 35 | /* Register offsets from <machine/reg.h>. */ |
| 36 | struct ppc_reg_offsets ppcobsd_reg_offsets; |
| 37 | \f |
| 38 | |
| 39 | /* Core file support. */ |
| 40 | |
| 41 | /* Supply register REGNUM in the general-purpose register set REGSET |
| 42 | from the buffer specified by GREGS and LEN to register cache |
| 43 | REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ |
| 44 | |
| 45 | void |
| 46 | ppcobsd_supply_gregset (const struct regset *regset, |
| 47 | struct regcache *regcache, int regnum, |
| 48 | const void *gregs, size_t len) |
| 49 | { |
| 50 | /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating |
| 51 | point registers. Traditionally, GDB's register set has still |
| 52 | listed the floating point registers for such machines, so this |
| 53 | code is harmless. However, the new E500 port actually omits the |
| 54 | floating point registers entirely from the register set --- they |
| 55 | don't even have register numbers assigned to them. |
| 56 | |
| 57 | It's not clear to me how best to update this code, so this assert |
| 58 | will alert the first person to encounter the OpenBSD/E500 |
| 59 | combination to the problem. */ |
| 60 | gdb_assert (ppc_floating_point_unit_p (current_gdbarch)); |
| 61 | |
| 62 | ppc_supply_gregset (regset, regcache, regnum, gregs, len); |
| 63 | ppc_supply_fpregset (regset, regcache, regnum, gregs, len); |
| 64 | } |
| 65 | |
| 66 | /* Collect register REGNUM in the general-purpose register set |
| 67 | REGSET. from register cache REGCACHE into the buffer specified by |
| 68 | GREGS and LEN. If REGNUM is -1, do this for all registers in |
| 69 | REGSET. */ |
| 70 | |
| 71 | void |
| 72 | ppcobsd_collect_gregset (const struct regset *regset, |
| 73 | const struct regcache *regcache, int regnum, |
| 74 | void *gregs, size_t len) |
| 75 | { |
| 76 | /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating |
| 77 | point registers. Traditionally, GDB's register set has still |
| 78 | listed the floating point registers for such machines, so this |
| 79 | code is harmless. However, the new E500 port actually omits the |
| 80 | floating point registers entirely from the register set --- they |
| 81 | don't even have register numbers assigned to them. |
| 82 | |
| 83 | It's not clear to me how best to update this code, so this assert |
| 84 | will alert the first person to encounter the OpenBSD/E500 |
| 85 | combination to the problem. */ |
| 86 | gdb_assert (ppc_floating_point_unit_p (current_gdbarch)); |
| 87 | |
| 88 | ppc_collect_gregset (regset, regcache, regnum, gregs, len); |
| 89 | ppc_collect_fpregset (regset, regcache, regnum, gregs, len); |
| 90 | } |
| 91 | |
| 92 | /* OpenBS/powerpc register set. */ |
| 93 | |
| 94 | struct regset ppcobsd_gregset = |
| 95 | { |
| 96 | &ppcobsd_reg_offsets, |
| 97 | ppcobsd_supply_gregset |
| 98 | }; |
| 99 | |
| 100 | /* Return the appropriate register set for the core section identified |
| 101 | by SECT_NAME and SECT_SIZE. */ |
| 102 | |
| 103 | static const struct regset * |
| 104 | ppcobsd_regset_from_core_section (struct gdbarch *gdbarch, |
| 105 | const char *sect_name, size_t sect_size) |
| 106 | { |
| 107 | if (strcmp (sect_name, ".reg") == 0 && sect_size >= 412) |
| 108 | return &ppcobsd_gregset; |
| 109 | |
| 110 | return NULL; |
| 111 | } |
| 112 | \f |
| 113 | |
| 114 | static void |
| 115 | ppcobsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 116 | { |
| 117 | /* OpenBSD uses SVR4-style shared libraries. */ |
| 118 | set_solib_svr4_fetch_link_map_offsets |
| 119 | (gdbarch, svr4_ilp32_fetch_link_map_offsets); |
| 120 | |
| 121 | set_gdbarch_regset_from_core_section |
| 122 | (gdbarch, ppcobsd_regset_from_core_section); |
| 123 | } |
| 124 | \f |
| 125 | |
| 126 | /* OpenBSD uses uses the traditional NetBSD core file format, even for |
| 127 | ports that use ELF. */ |
| 128 | #define GDB_OSABI_NETBSD_CORE GDB_OSABI_OPENBSD_ELF |
| 129 | |
| 130 | static enum gdb_osabi |
| 131 | ppcobsd_core_osabi_sniffer (bfd *abfd) |
| 132 | { |
| 133 | if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0) |
| 134 | return GDB_OSABI_NETBSD_CORE; |
| 135 | |
| 136 | return GDB_OSABI_UNKNOWN; |
| 137 | } |
| 138 | \f |
| 139 | |
| 140 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 141 | void _initialize_ppcobsd_tdep (void); |
| 142 | |
| 143 | void |
| 144 | _initialize_ppcobsd_tdep (void) |
| 145 | { |
| 146 | /* BFD doesn't set a flavour for NetBSD style a.out core files. */ |
| 147 | gdbarch_register_osabi_sniffer (bfd_arch_powerpc, bfd_target_unknown_flavour, |
| 148 | ppcobsd_core_osabi_sniffer); |
| 149 | |
| 150 | gdbarch_register_osabi (bfd_arch_powerpc, 0, GDB_OSABI_OPENBSD_ELF, |
| 151 | ppcobsd_init_abi); |
| 152 | |
| 153 | /* Avoid initializing the register offsets again if they were |
| 154 | already initailized by ppcobsd-nat.c. */ |
| 155 | if (ppcobsd_reg_offsets.pc_offset == 0) |
| 156 | { |
| 157 | /* General-purpose registers. */ |
| 158 | ppcobsd_reg_offsets.r0_offset = 0; |
| 159 | ppcobsd_reg_offsets.pc_offset = 384; |
| 160 | ppcobsd_reg_offsets.ps_offset = 388; |
| 161 | ppcobsd_reg_offsets.cr_offset = 392; |
| 162 | ppcobsd_reg_offsets.lr_offset = 396; |
| 163 | ppcobsd_reg_offsets.ctr_offset = 400; |
| 164 | ppcobsd_reg_offsets.xer_offset = 404; |
| 165 | ppcobsd_reg_offsets.mq_offset = 408; |
| 166 | |
| 167 | /* Floating-point registers. */ |
| 168 | ppcobsd_reg_offsets.f0_offset = 128; |
| 169 | ppcobsd_reg_offsets.fpscr_offset = -1; |
| 170 | |
| 171 | /* AltiVec registers. */ |
| 172 | ppcobsd_reg_offsets.vr0_offset = 0; |
| 173 | ppcobsd_reg_offsets.vscr_offset = 512; |
| 174 | ppcobsd_reg_offsets.vrsave_offset = 520; |
| 175 | } |
| 176 | } |