| 1 | /* Target-dependent code for OpenBSD/powerpc. |
| 2 | |
| 3 | Copyright 2004, 2005 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 "floatformat.h" |
| 25 | #include "osabi.h" |
| 26 | #include "regcache.h" |
| 27 | #include "regset.h" |
| 28 | #include "trad-frame.h" |
| 29 | #include "tramp-frame.h" |
| 30 | |
| 31 | #include "gdb_assert.h" |
| 32 | #include "gdb_string.h" |
| 33 | |
| 34 | #include "ppc-tdep.h" |
| 35 | #include "ppcobsd-tdep.h" |
| 36 | #include "solib-svr4.h" |
| 37 | |
| 38 | /* Register offsets from <machine/reg.h>. */ |
| 39 | struct ppc_reg_offsets ppcobsd_reg_offsets; |
| 40 | \f |
| 41 | |
| 42 | /* Core file support. */ |
| 43 | |
| 44 | /* Supply register REGNUM in the general-purpose register set REGSET |
| 45 | from the buffer specified by GREGS and LEN to register cache |
| 46 | REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ |
| 47 | |
| 48 | void |
| 49 | ppcobsd_supply_gregset (const struct regset *regset, |
| 50 | struct regcache *regcache, int regnum, |
| 51 | const void *gregs, size_t len) |
| 52 | { |
| 53 | /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating |
| 54 | point registers. Traditionally, GDB's register set has still |
| 55 | listed the floating point registers for such machines, so this |
| 56 | code is harmless. However, the new E500 port actually omits the |
| 57 | floating point registers entirely from the register set --- they |
| 58 | don't even have register numbers assigned to them. |
| 59 | |
| 60 | It's not clear to me how best to update this code, so this assert |
| 61 | will alert the first person to encounter the OpenBSD/E500 |
| 62 | combination to the problem. */ |
| 63 | gdb_assert (ppc_floating_point_unit_p (current_gdbarch)); |
| 64 | |
| 65 | ppc_supply_gregset (regset, regcache, regnum, gregs, len); |
| 66 | ppc_supply_fpregset (regset, regcache, regnum, gregs, len); |
| 67 | } |
| 68 | |
| 69 | /* Collect register REGNUM in the general-purpose register set |
| 70 | REGSET. from register cache REGCACHE into the buffer specified by |
| 71 | GREGS and LEN. If REGNUM is -1, do this for all registers in |
| 72 | REGSET. */ |
| 73 | |
| 74 | void |
| 75 | ppcobsd_collect_gregset (const struct regset *regset, |
| 76 | const struct regcache *regcache, int regnum, |
| 77 | void *gregs, size_t len) |
| 78 | { |
| 79 | /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating |
| 80 | point registers. Traditionally, GDB's register set has still |
| 81 | listed the floating point registers for such machines, so this |
| 82 | code is harmless. However, the new E500 port actually omits the |
| 83 | floating point registers entirely from the register set --- they |
| 84 | don't even have register numbers assigned to them. |
| 85 | |
| 86 | It's not clear to me how best to update this code, so this assert |
| 87 | will alert the first person to encounter the OpenBSD/E500 |
| 88 | combination to the problem. */ |
| 89 | gdb_assert (ppc_floating_point_unit_p (current_gdbarch)); |
| 90 | |
| 91 | ppc_collect_gregset (regset, regcache, regnum, gregs, len); |
| 92 | ppc_collect_fpregset (regset, regcache, regnum, gregs, len); |
| 93 | } |
| 94 | |
| 95 | /* OpenBSD/powerpc register set. */ |
| 96 | |
| 97 | struct regset ppcobsd_gregset = |
| 98 | { |
| 99 | &ppcobsd_reg_offsets, |
| 100 | ppcobsd_supply_gregset |
| 101 | }; |
| 102 | |
| 103 | /* Return the appropriate register set for the core section identified |
| 104 | by SECT_NAME and SECT_SIZE. */ |
| 105 | |
| 106 | static const struct regset * |
| 107 | ppcobsd_regset_from_core_section (struct gdbarch *gdbarch, |
| 108 | const char *sect_name, size_t sect_size) |
| 109 | { |
| 110 | if (strcmp (sect_name, ".reg") == 0 && sect_size >= 412) |
| 111 | return &ppcobsd_gregset; |
| 112 | |
| 113 | return NULL; |
| 114 | } |
| 115 | \f |
| 116 | |
| 117 | /* Signal trampolines. */ |
| 118 | |
| 119 | static void |
| 120 | ppcobsd_sigtramp_cache_init (const struct tramp_frame *self, |
| 121 | struct frame_info *next_frame, |
| 122 | struct trad_frame_cache *this_cache, |
| 123 | CORE_ADDR func) |
| 124 | { |
| 125 | struct gdbarch *gdbarch = get_frame_arch (next_frame); |
| 126 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 127 | CORE_ADDR addr, base; |
| 128 | int i; |
| 129 | |
| 130 | base = frame_unwind_register_unsigned (next_frame, SP_REGNUM); |
| 131 | addr = base + 0x18 + 2 * tdep->wordsize; |
| 132 | for (i = 0; i < ppc_num_gprs; i++, addr += tdep->wordsize) |
| 133 | { |
| 134 | int regnum = i + tdep->ppc_gp0_regnum; |
| 135 | trad_frame_set_reg_addr (this_cache, regnum, addr); |
| 136 | } |
| 137 | trad_frame_set_reg_addr (this_cache, tdep->ppc_lr_regnum, addr); |
| 138 | addr += tdep->wordsize; |
| 139 | trad_frame_set_reg_addr (this_cache, tdep->ppc_cr_regnum, addr); |
| 140 | addr += tdep->wordsize; |
| 141 | trad_frame_set_reg_addr (this_cache, tdep->ppc_xer_regnum, addr); |
| 142 | addr += tdep->wordsize; |
| 143 | trad_frame_set_reg_addr (this_cache, tdep->ppc_ctr_regnum, addr); |
| 144 | addr += tdep->wordsize; |
| 145 | trad_frame_set_reg_addr (this_cache, PC_REGNUM, addr); /* SRR0? */ |
| 146 | addr += tdep->wordsize; |
| 147 | |
| 148 | /* Construct the frame ID using the function start. */ |
| 149 | trad_frame_set_id (this_cache, frame_id_build (base, func)); |
| 150 | } |
| 151 | |
| 152 | static const struct tramp_frame ppcobsd_sigtramp = |
| 153 | { |
| 154 | SIGTRAMP_FRAME, |
| 155 | 4, |
| 156 | { |
| 157 | { 0x3821fff0, -1 }, /* add r1,r1,-16 */ |
| 158 | { 0x4e800021, -1 }, /* blrl */ |
| 159 | { 0x38610018, -1 }, /* addi r3,r1,24 */ |
| 160 | { 0x38000067, -1 }, /* li r0,103 */ |
| 161 | { 0x44000002, -1 }, /* sc */ |
| 162 | { 0x38000001, -1 }, /* li r0,1 */ |
| 163 | { 0x44000002, -1 }, /* sc */ |
| 164 | { TRAMP_SENTINEL_INSN, -1 } |
| 165 | }, |
| 166 | ppcobsd_sigtramp_cache_init |
| 167 | }; |
| 168 | \f |
| 169 | |
| 170 | static void |
| 171 | ppcobsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 172 | { |
| 173 | /* OpenBSD doesn't support the 128-bit `long double' from the psABI. */ |
| 174 | set_gdbarch_long_double_bit (gdbarch, 64); |
| 175 | set_gdbarch_long_double_format (gdbarch, &floatformat_ieee_double_big); |
| 176 | |
| 177 | /* OpenBSD currently uses a broken GCC. */ |
| 178 | set_gdbarch_return_value (gdbarch, ppc_sysv_abi_broken_return_value); |
| 179 | |
| 180 | /* OpenBSD uses SVR4-style shared libraries. */ |
| 181 | set_solib_svr4_fetch_link_map_offsets |
| 182 | (gdbarch, svr4_ilp32_fetch_link_map_offsets); |
| 183 | |
| 184 | set_gdbarch_regset_from_core_section |
| 185 | (gdbarch, ppcobsd_regset_from_core_section); |
| 186 | |
| 187 | tramp_frame_prepend_unwinder (gdbarch, &ppcobsd_sigtramp); |
| 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 | ppcobsd_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_ppcobsd_tdep (void); |
| 207 | |
| 208 | void |
| 209 | _initialize_ppcobsd_tdep (void) |
| 210 | { |
| 211 | /* BFD doesn't set a flavour for NetBSD style a.out core files. */ |
| 212 | gdbarch_register_osabi_sniffer (bfd_arch_powerpc, bfd_target_unknown_flavour, |
| 213 | ppcobsd_core_osabi_sniffer); |
| 214 | |
| 215 | gdbarch_register_osabi (bfd_arch_rs6000, 0, GDB_OSABI_OPENBSD_ELF, |
| 216 | ppcobsd_init_abi); |
| 217 | gdbarch_register_osabi (bfd_arch_powerpc, 0, GDB_OSABI_OPENBSD_ELF, |
| 218 | ppcobsd_init_abi); |
| 219 | |
| 220 | /* Avoid initializing the register offsets again if they were |
| 221 | already initailized by ppcobsd-nat.c. */ |
| 222 | if (ppcobsd_reg_offsets.pc_offset == 0) |
| 223 | { |
| 224 | /* General-purpose registers. */ |
| 225 | ppcobsd_reg_offsets.r0_offset = 0; |
| 226 | ppcobsd_reg_offsets.pc_offset = 384; |
| 227 | ppcobsd_reg_offsets.ps_offset = 388; |
| 228 | ppcobsd_reg_offsets.cr_offset = 392; |
| 229 | ppcobsd_reg_offsets.lr_offset = 396; |
| 230 | ppcobsd_reg_offsets.ctr_offset = 400; |
| 231 | ppcobsd_reg_offsets.xer_offset = 404; |
| 232 | ppcobsd_reg_offsets.mq_offset = 408; |
| 233 | |
| 234 | /* Floating-point registers. */ |
| 235 | ppcobsd_reg_offsets.f0_offset = 128; |
| 236 | ppcobsd_reg_offsets.fpscr_offset = -1; |
| 237 | |
| 238 | /* AltiVec registers. */ |
| 239 | ppcobsd_reg_offsets.vr0_offset = 0; |
| 240 | ppcobsd_reg_offsets.vscr_offset = 512; |
| 241 | ppcobsd_reg_offsets.vrsave_offset = 520; |
| 242 | } |
| 243 | } |