gdb/sparc64nbsd-tdep.c

   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 "regset.h"
  30 #include "symtab.h"
  31 #include "solib-svr4.h"
  32 #include "trad-frame.h"
  33
  34 #include "gdb_assert.h"
  35 #include "gdb_string.h"
  36
  37 #include "sparc64-tdep.h"
  38 #include "nbsd-tdep.h"
  39
  40 /* From <machine/reg.h>.  */
  41 const struct sparc_gregset sparc64nbsd_gregset =
  42 {
  43   0 * 8,                        /* "tstate" */
  44   1 * 8,                        /* %pc */
  45   2 * 8,                        /* %npc */
  46   3 * 8,                        /* %y */
  47   -1,                           /* %fprs */
  48   -1,
  49   5 * 8,                        /* %g1 */
  50   -1,                           /* %l0 */
  51   4                             /* sizeof (%y) */
  52 };
  53 \f
  54
  55 static void
  56 sparc64nbsd_supply_gregset (const struct regset *regset,
  57                             struct regcache *regcache,
  58                             int regnum, const void *gregs, size_t len)
  59 {
  60   sparc64_supply_gregset (regset->descr, regcache, regnum, gregs);
  61 }
  62
  63 static void
  64 sparc64nbsd_supply_fpregset (const struct regset *regset,
  65                              struct regcache *regcache,
  66                              int regnum, const void *fpregs, size_t len)
  67 {
  68   sparc64_supply_fpregset (regcache, regnum, fpregs);
  69 }
  70 \f
  71
  72 /* Signal trampolines.  */
  73
  74 /* The following variables describe the location of an on-stack signal
  75    trampoline.  The current values correspond to the memory layout for
  76    NetBSD 1.3 and up.  These shouldn't be necessary for NetBSD 2.0 and
  77    up, since NetBSD uses signal trampolines provided by libc now.  */
  78
  79 static const CORE_ADDR sparc64nbsd_sigtramp_start = 0xffffffffffffdee4ULL;
  80 static const CORE_ADDR sparc64nbsd_sigtramp_end = 0xffffffffffffe000ULL;
  81
  82 static int
  83 sparc64nbsd_pc_in_sigtramp (CORE_ADDR pc, char *name)
  84 {
  85   if (pc >= sparc64nbsd_sigtramp_start && pc < sparc64nbsd_sigtramp_end)
  86     return 1;
  87
  88   return nbsd_pc_in_sigtramp (pc, name);
  89 }
  90
  91 struct trad_frame_saved_reg *
  92 sparc64nbsd_sigcontext_saved_regs (CORE_ADDR sigcontext_addr,
  93                                    struct frame_info *next_frame)
  94 {
  95   struct trad_frame_saved_reg *saved_regs;
  96   CORE_ADDR addr, sp;
  97   int regnum, delta;
  98
  99   saved_regs = trad_frame_alloc_saved_regs (next_frame);
 100
 101   /* The registers are saved in bits and pieces scattered all over the
 102      place.  The code below records their location on the assumption
 103      that the part of the signal trampoline that saves the state has
 104      been executed.  */
 105
 106   saved_regs[SPARC_SP_REGNUM].addr = sigcontext_addr + 8;
 107   saved_regs[SPARC64_PC_REGNUM].addr = sigcontext_addr + 16;
 108   saved_regs[SPARC64_NPC_REGNUM].addr = sigcontext_addr + 24;
 109   saved_regs[SPARC64_STATE_REGNUM].addr = sigcontext_addr + 32;
 110   saved_regs[SPARC_G1_REGNUM].addr = sigcontext_addr + 40;
 111   saved_regs[SPARC_O0_REGNUM].addr = sigcontext_addr + 48;
 112
 113   /* The remaining `global' registers and %y are saved in the `local'
 114      registers.  */
 115   delta = SPARC_L0_REGNUM - SPARC_G0_REGNUM;
 116   for (regnum = SPARC_G2_REGNUM; regnum <= SPARC_G7_REGNUM; regnum++)
 117     saved_regs[regnum].realreg = regnum + delta;
 118   saved_regs[SPARC64_Y_REGNUM].realreg = SPARC_L1_REGNUM;
 119
 120   /* The remaining `out' registers can be found in the current frame's
 121      `in' registers.  */
 122   delta = SPARC_I0_REGNUM - SPARC_O0_REGNUM;
 123   for (regnum = SPARC_O1_REGNUM; regnum <= SPARC_O5_REGNUM; regnum++)
 124     saved_regs[regnum].realreg = regnum + delta;
 125   saved_regs[SPARC_O7_REGNUM].realreg = SPARC_I7_REGNUM;
 126
 127   /* The `local' and `in' registers have been saved in the register
 128      save area.  */
 129   addr = saved_regs[SPARC_SP_REGNUM].addr;
 130   sp = get_frame_memory_unsigned (next_frame, addr, 8);
 131   for (regnum = SPARC_L0_REGNUM, addr = sp + BIAS;
 132        regnum <= SPARC_I7_REGNUM; regnum++, addr += 8)
 133     saved_regs[regnum].addr = addr;
 134
 135   /* TODO: Handle the floating-point registers.  */
 136
 137   return saved_regs;
 138 }
 139
 140 static struct sparc_frame_cache *
 141 sparc64nbsd_sigcontext_frame_cache (struct frame_info *next_frame,
 142                                     void **this_cache)
 143 {
 144   struct sparc_frame_cache *cache;
 145   CORE_ADDR addr;
 146
 147   if (*this_cache)
 148     return *this_cache;
 149
 150   cache = sparc_frame_cache (next_frame, this_cache);
 151   gdb_assert (cache == *this_cache);
 152
 153   /* If we couldn't find the frame's function, we're probably dealing
 154      with an on-stack signal trampoline.  */
 155   if (cache->pc == 0)
 156     {
 157       cache->pc = sparc64nbsd_sigtramp_start;
 158
 159       /* Since we couldn't find the frame's function, the cache was
 160          initialized under the assumption that we're frameless.  */
 161       cache->frameless_p = 0;
 162       addr = frame_unwind_register_unsigned (next_frame, SPARC_FP_REGNUM);
 163       cache->base = addr;
 164     }
 165
 166   /* We find the appropriate instance of `struct sigcontext' at a
 167      fixed offset in the signal frame.  */
 168   addr = cache->base + BIAS + 128 + 8;
 169   cache->saved_regs = sparc64nbsd_sigcontext_saved_regs (addr, next_frame);
 170
 171   return cache;
 172 }
 173
 174 static void
 175 sparc64nbsd_sigcontext_frame_this_id (struct frame_info *next_frame,
 176                                       void **this_cache,
 177                                       struct frame_id *this_id)
 178 {
 179   struct sparc_frame_cache *cache =
 180     sparc64nbsd_sigcontext_frame_cache (next_frame, this_cache);
 181
 182   (*this_id) = frame_id_build (cache->base, cache->pc);
 183 }
 184
 185 static void
 186 sparc64nbsd_sigcontext_frame_prev_register (struct frame_info *next_frame,
 187                                             void **this_cache,
 188                                             int regnum, int *optimizedp,
 189                                             enum lval_type *lvalp,
 190                                             CORE_ADDR *addrp,
 191                                             int *realnump, void *valuep)
 192 {
 193   struct sparc_frame_cache *cache =
 194     sparc64nbsd_sigcontext_frame_cache (next_frame, this_cache);
 195
 196   trad_frame_prev_register (next_frame, cache->saved_regs, regnum,
 197                             optimizedp, lvalp, addrp, realnump, valuep);
 198 }
 199
 200 static const struct frame_unwind sparc64nbsd_sigcontext_frame_unwind =
 201 {
 202   SIGTRAMP_FRAME,
 203   sparc64nbsd_sigcontext_frame_this_id,
 204   sparc64nbsd_sigcontext_frame_prev_register
 205 };
 206
 207 static const struct frame_unwind *
 208 sparc64nbsd_sigtramp_frame_sniffer (struct frame_info *next_frame)
 209 {
 210   CORE_ADDR pc = frame_pc_unwind (next_frame);
 211   char *name;
 212
 213   find_pc_partial_function (pc, &name, NULL, NULL);
 214   if (sparc64nbsd_pc_in_sigtramp (pc, name))
 215     {
 216       if (name == NULL || strncmp (name, "__sigtramp_sigcontext", 21))
 217         return &sparc64nbsd_sigcontext_frame_unwind;
 218     }
 219
 220   return NULL;
 221 }
 222 \f
 223
 224 static void
 225 sparc64nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 226 {
 227   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 228
 229   tdep->gregset = XMALLOC (struct regset);
 230   tdep->gregset->descr = &sparc64nbsd_gregset;
 231   tdep->gregset->supply_regset = sparc64nbsd_supply_gregset;
 232   tdep->sizeof_gregset = 160;
 233
 234   tdep->fpregset = XMALLOC (struct regset);
 235   tdep->fpregset->supply_regset = sparc64nbsd_supply_fpregset;
 236   tdep->sizeof_fpregset = 272;
 237
 238   set_gdbarch_deprecated_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 }