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 "objfiles.h"
  32 #include "solib-svr4.h"
  33 #include "trad-frame.h"
  34
  35 #include "gdb_assert.h"
  36 #include "gdb_string.h"
  37
  38 #include "sparc64-tdep.h"
  39 #include "nbsd-tdep.h"
  40
  41 /* From <machine/reg.h>.  */
  42 const struct sparc_gregset sparc64nbsd_gregset =
  43 {
  44   0 * 8,                        /* "tstate" */
  45   1 * 8,                        /* %pc */
  46   2 * 8,                        /* %npc */
  47   3 * 8,                        /* %y */
  48   -1,                           /* %fprs */
  49   -1,
  50   5 * 8,                        /* %g1 */
  51   -1,                           /* %l0 */
  52   4                             /* sizeof (%y) */
  53 };
  54 \f
  55
  56 static void
  57 sparc64nbsd_supply_gregset (const struct regset *regset,
  58                             struct regcache *regcache,
  59                             int regnum, const void *gregs, size_t len)
  60 {
  61   sparc64_supply_gregset (&sparc64nbsd_gregset, regcache, regnum, gregs);
  62 }
  63
  64 static void
  65 sparc64nbsd_supply_fpregset (const struct regset *regset,
  66                              struct regcache *regcache,
  67                              int regnum, const void *fpregs, size_t len)
  68 {
  69   sparc64_supply_fpregset (regcache, regnum, fpregs);
  70 }
  71 \f
  72
  73 /* Signal trampolines.  */
  74
  75 /* The following variables describe the location of an on-stack signal
  76    trampoline.  The current values correspond to the memory layout for
  77    NetBSD 1.3 and up.  These shouldn't be necessary for NetBSD 2.0 and
  78    up, since NetBSD uses signal trampolines provided by libc now.  */
  79
  80 static const CORE_ADDR sparc64nbsd_sigtramp_start = 0xffffffffffffdee4ULL;
  81 static const CORE_ADDR sparc64nbsd_sigtramp_end = 0xffffffffffffe000ULL;
  82
  83 static int
  84 sparc64nbsd_pc_in_sigtramp (CORE_ADDR pc, char *name)
  85 {
  86   if (pc >= sparc64nbsd_sigtramp_start && pc < sparc64nbsd_sigtramp_end)
  87     return 1;
  88
  89   return nbsd_pc_in_sigtramp (pc, name);
  90 }
  91
  92 struct trad_frame_saved_reg *
  93 sparc64nbsd_sigcontext_saved_regs (CORE_ADDR sigcontext_addr,
  94                                    struct frame_info *next_frame)
  95 {
  96   struct trad_frame_saved_reg *saved_regs;
  97   CORE_ADDR addr, sp;
  98   int regnum, delta;
  99
 100   saved_regs = trad_frame_alloc_saved_regs (next_frame);
 101
 102   /* The registers are saved in bits and pieces scattered all over the
 103      place.  The code below records their location on the assumption
 104      that the part of the signal trampoline that saves the state has
 105      been executed.  */
 106
 107   saved_regs[SPARC_SP_REGNUM].addr = sigcontext_addr + 8;
 108   saved_regs[SPARC64_PC_REGNUM].addr = sigcontext_addr + 16;
 109   saved_regs[SPARC64_NPC_REGNUM].addr = sigcontext_addr + 24;
 110   saved_regs[SPARC64_STATE_REGNUM].addr = sigcontext_addr + 32;
 111   saved_regs[SPARC_G1_REGNUM].addr = sigcontext_addr + 40;
 112   saved_regs[SPARC_O0_REGNUM].addr = sigcontext_addr + 48;
 113
 114   /* The remaining `global' registers and %y are saved in the `local'
 115      registers.  */
 116   delta = SPARC_L0_REGNUM - SPARC_G0_REGNUM;
 117   for (regnum = SPARC_G2_REGNUM; regnum <= SPARC_G7_REGNUM; regnum++)
 118     saved_regs[regnum].realreg = regnum + delta;
 119   saved_regs[SPARC64_Y_REGNUM].realreg = SPARC_L1_REGNUM;
 120
 121   /* The remaining `out' registers can be found in the current frame's
 122      `in' registers.  */
 123   delta = SPARC_I0_REGNUM - SPARC_O0_REGNUM;
 124   for (regnum = SPARC_O1_REGNUM; regnum <= SPARC_O5_REGNUM; regnum++)
 125     saved_regs[regnum].realreg = regnum + delta;
 126   saved_regs[SPARC_O7_REGNUM].realreg = SPARC_I7_REGNUM;
 127
 128   /* The `local' and `in' registers have been saved in the register
 129      save area.  */
 130   addr = saved_regs[SPARC_SP_REGNUM].addr;
 131   sp = get_frame_memory_unsigned (next_frame, addr, 8);
 132   for (regnum = SPARC_L0_REGNUM, addr = sp + BIAS;
 133        regnum <= SPARC_I7_REGNUM; regnum++, addr += 8)
 134     saved_regs[regnum].addr = addr;
 135
 136   /* TODO: Handle the floating-point registers.  */
 137
 138   return saved_regs;
 139 }
 140
 141 static struct sparc_frame_cache *
 142 sparc64nbsd_sigcontext_frame_cache (struct frame_info *next_frame,
 143                                     void **this_cache)
 144 {
 145   struct sparc_frame_cache *cache;
 146   CORE_ADDR addr;
 147
 148   if (*this_cache)
 149     return *this_cache;
 150
 151   cache = sparc_frame_cache (next_frame, this_cache);
 152   gdb_assert (cache == *this_cache);
 153
 154   /* If we couldn't find the frame's function, we're probably dealing
 155      with an on-stack signal trampoline.  */
 156   if (cache->pc == 0)
 157     {
 158       cache->pc = sparc64nbsd_sigtramp_start;
 159
 160       /* Since we couldn't find the frame's function, the cache was
 161          initialized under the assumption that we're frameless.  */
 162       cache->frameless_p = 0;
 163       addr = frame_unwind_register_unsigned (next_frame, SPARC_FP_REGNUM);
 164       cache->base = addr;
 165     }
 166
 167   /* We find the appropriate instance of `struct sigcontext' at a
 168      fixed offset in the signal frame.  */
 169   addr = cache->base + BIAS + 128 + 8;
 170   cache->saved_regs = sparc64nbsd_sigcontext_saved_regs (addr, next_frame);
 171
 172   return cache;
 173 }
 174
 175 static void
 176 sparc64nbsd_sigcontext_frame_this_id (struct frame_info *next_frame,
 177                                       void **this_cache,
 178                                       struct frame_id *this_id)
 179 {
 180   struct sparc_frame_cache *cache =
 181     sparc64nbsd_sigcontext_frame_cache (next_frame, this_cache);
 182
 183   (*this_id) = frame_id_build (cache->base, cache->pc);
 184 }
 185
 186 static void
 187 sparc64nbsd_sigcontext_frame_prev_register (struct frame_info *next_frame,
 188                                             void **this_cache,
 189                                             int regnum, int *optimizedp,
 190                                             enum lval_type *lvalp,
 191                                             CORE_ADDR *addrp,
 192                                             int *realnump, void *valuep)
 193 {
 194   struct sparc_frame_cache *cache =
 195     sparc64nbsd_sigcontext_frame_cache (next_frame, this_cache);
 196
 197   trad_frame_get_prev_register (next_frame, cache->saved_regs, regnum,
 198                                 optimizedp, lvalp, addrp, realnump, valuep);
 199 }
 200
 201 static const struct frame_unwind sparc64nbsd_sigcontext_frame_unwind =
 202 {
 203   SIGTRAMP_FRAME,
 204   sparc64nbsd_sigcontext_frame_this_id,
 205   sparc64nbsd_sigcontext_frame_prev_register
 206 };
 207
 208 static const struct frame_unwind *
 209 sparc64nbsd_sigtramp_frame_sniffer (struct frame_info *next_frame)
 210 {
 211   CORE_ADDR pc = frame_pc_unwind (next_frame);
 212   char *name;
 213
 214   find_pc_partial_function (pc, &name, NULL, NULL);
 215   if (sparc64nbsd_pc_in_sigtramp (pc, name))
 216     {
 217       if (name == NULL || strncmp (name, "__sigtramp_sigcontext", 21))
 218         return &sparc64nbsd_sigcontext_frame_unwind;
 219     }
 220
 221   return NULL;
 222 }
 223 \f
 224
 225 static void
 226 sparc64nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 227 {
 228   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 229
 230   tdep->gregset = regset_alloc (gdbarch, sparc64nbsd_supply_gregset, NULL);
 231   tdep->sizeof_gregset = 160;
 232
 233   tdep->fpregset = regset_alloc (gdbarch, sparc64nbsd_supply_fpregset, NULL);
 234   tdep->sizeof_fpregset = 272;
 235
 236   frame_unwind_append_sniffer (gdbarch, sparc64nbsd_sigtramp_frame_sniffer);
 237
 238   sparc64_init_abi (info, gdbarch);
 239
 240   /* NetBSD/sparc64 has SVR4-style shared libraries...  */
 241   set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
 242   set_solib_svr4_fetch_link_map_offsets
 243     (gdbarch, svr4_lp64_fetch_link_map_offsets);
 244 }
 245
 246 \f
 247 /* Provide a prototype to silence -Wmissing-prototypes.  */
 248 void _initialize_sparc64nbsd_tdep (void);
 249
 250 void
 251 _initialize_sparc64nbsd_tdep (void)
 252 {
 253   gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
 254                           GDB_OSABI_NETBSD_ELF, sparc64nbsd_init_abi);
 255 }