| 1 | /* Target-dependent code for NetBSD/sparc64. |
| 2 | |
| 3 | Copyright 2002, 2003, 2004 Free Software Foundation, Inc. |
| 4 | Based on code contributed by Wasabi Systems, 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 2 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, write to the Free Software |
| 20 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 21 | Boston, MA 02111-1307, USA. */ |
| 22 | |
| 23 | #include "defs.h" |
| 24 | #include "frame.h" |
| 25 | #include "frame-unwind.h" |
| 26 | #include "gdbcore.h" |
| 27 | #include "osabi.h" |
| 28 | #include "regcache.h" |
| 29 | #include "symtab.h" |
| 30 | #include "solib-svr4.h" |
| 31 | #include "trad-frame.h" |
| 32 | |
| 33 | #include "gdb_assert.h" |
| 34 | #include "gdb_string.h" |
| 35 | |
| 36 | #include "sparc64-tdep.h" |
| 37 | #include "nbsd-tdep.h" |
| 38 | |
| 39 | /* From <machine/reg.h>. */ |
| 40 | const struct sparc_gregset sparc64nbsd_gregset = |
| 41 | { |
| 42 | 0 * 8, /* "tstate" */ |
| 43 | 1 * 8, /* %pc */ |
| 44 | 2 * 8, /* %npc */ |
| 45 | 3 * 8, /* %y */ |
| 46 | -1, /* %fprs */ |
| 47 | -1, |
| 48 | 5 * 8, /* %g1 */ |
| 49 | -1, /* %l0 */ |
| 50 | 4 /* sizeof (%y) */ |
| 51 | }; |
| 52 | |
| 53 | /* Size of `struct reg' and `struct fpreg'. */ |
| 54 | static const int sparc64nbsd_sizeof_struct_reg = 160; |
| 55 | static const int sparc64nbsd_sizeof_struct_fpreg = 272; |
| 56 | |
| 57 | static void |
| 58 | fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which, |
| 59 | CORE_ADDR ignore) |
| 60 | { |
| 61 | switch (which) |
| 62 | { |
| 63 | case 0: /* Integer registers */ |
| 64 | if (core_reg_size != sparc64nbsd_sizeof_struct_reg) |
| 65 | warning ("Wrong size register set in core file."); |
| 66 | else |
| 67 | sparc64_supply_gregset (&sparc64nbsd_gregset, current_regcache, |
| 68 | -1, core_reg_sect); |
| 69 | break; |
| 70 | |
| 71 | case 2: /* Floating pointer registers */ |
| 72 | if (core_reg_size != sparc64nbsd_sizeof_struct_fpreg) |
| 73 | warning ("Wrong size FP register set in core file."); |
| 74 | else |
| 75 | sparc64_supply_fpregset (current_regcache, -1, core_reg_sect); |
| 76 | break; |
| 77 | |
| 78 | default: |
| 79 | /* Don't know what kind of register request this is; just ignore it. */ |
| 80 | break; |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | static struct core_fns sparc64nbsd_core_fns = |
| 85 | { |
| 86 | bfd_target_elf_flavour, /* core_flavour */ |
| 87 | default_check_format, /* check_format */ |
| 88 | default_core_sniffer, /* core_sniffer */ |
| 89 | fetch_core_registers, /* core_read_registers */ |
| 90 | NULL |
| 91 | }; |
| 92 | \f |
| 93 | /* Signal trampolines. */ |
| 94 | |
| 95 | /* The following variables describe the location of an on-stack signal |
| 96 | trampoline. The current values correspond to the memory layout for |
| 97 | NetBSD 1.3 and up. These shouldn't be necessary for NetBSD 2.0 and |
| 98 | up, since NetBSD uses signal trampolines provided by libc now. */ |
| 99 | |
| 100 | static const CORE_ADDR sparc64nbsd_sigtramp_start = 0xffffffffffffdee4ULL; |
| 101 | static const CORE_ADDR sparc64nbsd_sigtramp_end = 0xffffffffffffe000ULL; |
| 102 | |
| 103 | static int |
| 104 | sparc64nbsd_pc_in_sigtramp (CORE_ADDR pc, char *name) |
| 105 | { |
| 106 | if (pc >= sparc64nbsd_sigtramp_start && pc < sparc64nbsd_sigtramp_end) |
| 107 | return 1; |
| 108 | |
| 109 | return nbsd_pc_in_sigtramp (pc, name); |
| 110 | } |
| 111 | |
| 112 | static struct sparc_frame_cache * |
| 113 | sparc64nbsd_sigcontext_frame_cache (struct frame_info *next_frame, |
| 114 | void **this_cache) |
| 115 | { |
| 116 | struct sparc_frame_cache *cache; |
| 117 | CORE_ADDR addr, sigcontext_addr, sp; |
| 118 | LONGEST fprs; |
| 119 | int regnum, delta; |
| 120 | |
| 121 | if (*this_cache) |
| 122 | return *this_cache; |
| 123 | |
| 124 | cache = sparc_frame_cache (next_frame, this_cache); |
| 125 | gdb_assert (cache == *this_cache); |
| 126 | |
| 127 | /* The registers are saved in bits and pieces scattered all over the |
| 128 | place. The code below records their location on the assumption |
| 129 | that the part of the signal trampoline that saves the state has |
| 130 | been executed. */ |
| 131 | |
| 132 | /* If we couldn't find the frame's function, we're probably dealing |
| 133 | with an on-stack signal trampoline. */ |
| 134 | if (cache->pc == 0) |
| 135 | { |
| 136 | cache->pc = sparc64nbsd_sigtramp_start; |
| 137 | |
| 138 | /* Since we couldn't find the frame's function, the cache was |
| 139 | initialized under the assumption that we're frameless. */ |
| 140 | cache->frameless_p = 0; |
| 141 | addr = frame_unwind_register_unsigned (next_frame, SPARC_FP_REGNUM); |
| 142 | cache->base = addr; |
| 143 | } |
| 144 | |
| 145 | cache->saved_regs = trad_frame_alloc_saved_regs (next_frame); |
| 146 | |
| 147 | /* We find the appropriate instance of `struct sigcontext' at a |
| 148 | fixed offset in the signal frame. */ |
| 149 | sigcontext_addr = cache->base + BIAS + 128 + 8; |
| 150 | |
| 151 | cache->saved_regs[SPARC_SP_REGNUM].addr = sigcontext_addr + 8; |
| 152 | cache->saved_regs[SPARC64_PC_REGNUM].addr = sigcontext_addr + 16; |
| 153 | cache->saved_regs[SPARC64_NPC_REGNUM].addr = sigcontext_addr + 24; |
| 154 | cache->saved_regs[SPARC64_STATE_REGNUM].addr = sigcontext_addr + 32; |
| 155 | cache->saved_regs[SPARC_G1_REGNUM].addr = sigcontext_addr + 40; |
| 156 | cache->saved_regs[SPARC_O0_REGNUM].addr = sigcontext_addr + 48; |
| 157 | |
| 158 | /* The remaining `global' registers and %y are saved in the `local' |
| 159 | registers. */ |
| 160 | delta = SPARC_L0_REGNUM - SPARC_G0_REGNUM; |
| 161 | for (regnum = SPARC_G2_REGNUM; regnum <= SPARC_G7_REGNUM; regnum++) |
| 162 | cache->saved_regs[regnum].realreg = regnum + delta; |
| 163 | cache->saved_regs[SPARC64_Y_REGNUM].realreg = SPARC_L1_REGNUM; |
| 164 | |
| 165 | /* The remaining `out' registers can be found in the current frame's |
| 166 | `in' registers. */ |
| 167 | delta = SPARC_I0_REGNUM - SPARC_O0_REGNUM; |
| 168 | for (regnum = SPARC_O1_REGNUM; regnum <= SPARC_O5_REGNUM; regnum++) |
| 169 | cache->saved_regs[regnum].realreg = regnum + delta; |
| 170 | cache->saved_regs[SPARC_O7_REGNUM].realreg = SPARC_I7_REGNUM; |
| 171 | |
| 172 | /* The `local' and `in' registers have been saved in the register |
| 173 | save area. */ |
| 174 | addr = cache->saved_regs[SPARC_SP_REGNUM].addr; |
| 175 | sp = get_frame_memory_unsigned (next_frame, addr, 8); |
| 176 | for (regnum = SPARC_L0_REGNUM, addr = sp + BIAS; |
| 177 | regnum <= SPARC_I7_REGNUM; regnum++, addr += 8) |
| 178 | cache->saved_regs[regnum].addr = addr; |
| 179 | |
| 180 | /* TODO: Handle the floating-point registers. */ |
| 181 | |
| 182 | return cache; |
| 183 | } |
| 184 | |
| 185 | static void |
| 186 | sparc64nbsd_sigcontext_frame_this_id (struct frame_info *next_frame, |
| 187 | void **this_cache, |
| 188 | struct frame_id *this_id) |
| 189 | { |
| 190 | struct sparc_frame_cache *cache = |
| 191 | sparc64nbsd_sigcontext_frame_cache (next_frame, this_cache); |
| 192 | |
| 193 | (*this_id) = frame_id_build (cache->base, cache->pc); |
| 194 | } |
| 195 | |
| 196 | static void |
| 197 | sparc64nbsd_sigcontext_frame_prev_register (struct frame_info *next_frame, |
| 198 | void **this_cache, |
| 199 | int regnum, int *optimizedp, |
| 200 | enum lval_type *lvalp, |
| 201 | CORE_ADDR *addrp, |
| 202 | int *realnump, void *valuep) |
| 203 | { |
| 204 | struct sparc_frame_cache *cache = |
| 205 | sparc64nbsd_sigcontext_frame_cache (next_frame, this_cache); |
| 206 | |
| 207 | trad_frame_prev_register (next_frame, cache->saved_regs, regnum, |
| 208 | optimizedp, lvalp, addrp, realnump, valuep); |
| 209 | } |
| 210 | |
| 211 | static const struct frame_unwind sparc64nbsd_sigcontext_frame_unwind = |
| 212 | { |
| 213 | SIGTRAMP_FRAME, |
| 214 | sparc64nbsd_sigcontext_frame_this_id, |
| 215 | sparc64nbsd_sigcontext_frame_prev_register |
| 216 | }; |
| 217 | |
| 218 | static const struct frame_unwind * |
| 219 | sparc64nbsd_sigtramp_frame_sniffer (struct frame_info *next_frame) |
| 220 | { |
| 221 | CORE_ADDR pc = frame_pc_unwind (next_frame); |
| 222 | char *name; |
| 223 | |
| 224 | find_pc_partial_function (pc, &name, NULL, NULL); |
| 225 | if (sparc64nbsd_pc_in_sigtramp (pc, name)) |
| 226 | { |
| 227 | if (name == NULL || strncmp (name, "__sigtramp_sigcontext", 21)) |
| 228 | return &sparc64nbsd_sigcontext_frame_unwind; |
| 229 | } |
| 230 | |
| 231 | return NULL; |
| 232 | } |
| 233 | \f |
| 234 | |
| 235 | static void |
| 236 | sparc64nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 237 | { |
| 238 | set_gdbarch_pc_in_sigtramp (gdbarch, sparc64nbsd_pc_in_sigtramp); |
| 239 | frame_unwind_append_sniffer (gdbarch, sparc64nbsd_sigtramp_frame_sniffer); |
| 240 | |
| 241 | sparc64_init_abi (info, gdbarch); |
| 242 | |
| 243 | set_solib_svr4_fetch_link_map_offsets |
| 244 | (gdbarch, nbsd_lp64_solib_svr4_fetch_link_map_offsets); |
| 245 | } |
| 246 | |
| 247 | \f |
| 248 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
| 249 | void _initialize_sparc64nbsd_tdep (void); |
| 250 | |
| 251 | void |
| 252 | _initialize_sparc64nbsd_tdep (void) |
| 253 | { |
| 254 | gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9, |
| 255 | GDB_OSABI_NETBSD_ELF, sparc64nbsd_init_abi); |
| 256 | |
| 257 | add_core_fns (&sparc64nbsd_core_fns); |
| 258 | } |