gdb/sparc64-fbsd-tdep.c

   1 /* Target-dependent code for FreeBSD/sparc64.
   2
   3    Copyright (C) 2003-2017 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 3 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, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "frame.h"
  22 #include "frame-unwind.h"
  23 #include "gdbcore.h"
  24 #include "osabi.h"
  25 #include "regcache.h"
  26 #include "regset.h"
  27 #include "target.h"
  28 #include "trad-frame.h"
  29
  30 #include "sparc64-tdep.h"
  31 #include "fbsd-tdep.h"
  32 #include "solib-svr4.h"
  33
  34 /* From <machine/reg.h>.  */
  35 const struct sparc_gregmap sparc64fbsd_gregmap =
  36 {
  37   26 * 8,                       /* "tstate" */
  38   25 * 8,                       /* %pc */
  39   24 * 8,                       /* %npc */
  40   28 * 8,                       /* %y */
  41   16 * 8,                       /* %fprs */
  42   -1,
  43   1 * 8,                        /* %g1 */
  44   -1,                           /* %l0 */
  45   8                             /* sizeof (%y) */
  46 };
  47 \f
  48
  49 static void
  50 sparc64fbsd_supply_gregset (const struct regset *regset,
  51                             struct regcache *regcache,
  52                             int regnum, const void *gregs, size_t len)
  53 {
  54   sparc64_supply_gregset (&sparc64fbsd_gregmap, regcache, regnum, gregs);
  55 }
  56
  57 static void
  58 sparc64fbsd_collect_gregset (const struct regset *regset,
  59                              const struct regcache *regcache,
  60                              int regnum, void *gregs, size_t len)
  61 {
  62   sparc64_collect_gregset (&sparc64fbsd_gregmap, regcache, regnum, gregs);
  63 }
  64
  65 static void
  66 sparc64fbsd_supply_fpregset (const struct regset *regset,
  67                              struct regcache *regcache,
  68                              int regnum, const void *fpregs, size_t len)
  69 {
  70   sparc64_supply_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs);
  71 }
  72
  73 static void
  74 sparc64fbsd_collect_fpregset (const struct regset *regset,
  75                               const struct regcache *regcache,
  76                               int regnum, void *fpregs, size_t len)
  77 {
  78   sparc64_collect_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs);
  79 }
  80 \f
  81
  82 /* Signal trampolines.  */
  83
  84 static int
  85 sparc64fbsd_pc_in_sigtramp (CORE_ADDR pc, const char *name)
  86 {
  87   return (name && strcmp (name, "__sigtramp") == 0);
  88 }
  89
  90 static struct sparc_frame_cache *
  91 sparc64fbsd_sigtramp_frame_cache (struct frame_info *this_frame,
  92                                    void **this_cache)
  93 {
  94   struct sparc_frame_cache *cache;
  95   CORE_ADDR addr, mcontext_addr, sp;
  96   LONGEST fprs;
  97   int regnum;
  98
  99   if (*this_cache)
 100     return (struct sparc_frame_cache *) *this_cache;
 101
 102   cache = sparc_frame_cache (this_frame, this_cache);
 103   gdb_assert (cache == *this_cache);
 104
 105   cache->saved_regs = trad_frame_alloc_saved_regs (this_frame);
 106
 107   /* The third argument is a pointer to an instance of `ucontext_t',
 108      which has a member `uc_mcontext' that contains the saved
 109      registers.  */
 110   addr = get_frame_register_unsigned (this_frame, SPARC_O2_REGNUM);
 111   mcontext_addr = addr + 64;
 112
 113   /* The following registers travel in the `mc_local' slots of
 114      `mcontext_t'.  */
 115   addr = mcontext_addr + 16 * 8;
 116   cache->saved_regs[SPARC64_FPRS_REGNUM].addr = addr + 0 * 8;
 117   cache->saved_regs[SPARC64_FSR_REGNUM].addr = addr + 1 * 8;
 118
 119   /* The following registers travel in the `mc_in' slots of
 120      `mcontext_t'.  */
 121   addr = mcontext_addr + 24 * 8;
 122   cache->saved_regs[SPARC64_NPC_REGNUM].addr = addr + 0 * 8;
 123   cache->saved_regs[SPARC64_PC_REGNUM].addr = addr + 1 * 8;
 124   cache->saved_regs[SPARC64_STATE_REGNUM].addr = addr + 2 * 8;
 125   cache->saved_regs[SPARC64_Y_REGNUM].addr = addr + 4 * 8;
 126
 127   /* The `global' and `out' registers travel in the `mc_global' and
 128      `mc_out' slots of `mcontext_t', except for %g0.  Since %g0 is
 129      always zero, keep the identity encoding.  */
 130   for (regnum = SPARC_G1_REGNUM, addr = mcontext_addr + 8;
 131        regnum <= SPARC_O7_REGNUM; regnum++, addr += 8)
 132     cache->saved_regs[regnum].addr = addr;
 133
 134   /* The `local' and `in' registers have been saved in the register
 135      save area.  */
 136   addr = cache->saved_regs[SPARC_SP_REGNUM].addr;
 137   sp = get_frame_memory_unsigned (this_frame, addr, 8);
 138   for (regnum = SPARC_L0_REGNUM, addr = sp + BIAS;
 139        regnum <= SPARC_I7_REGNUM; regnum++, addr += 8)
 140     cache->saved_regs[regnum].addr = addr;
 141
 142   /* The floating-point registers are only saved if the FEF bit in
 143      %fprs has been set.  */
 144
 145 #define FPRS_FEF        (1 << 2)
 146
 147   addr = cache->saved_regs[SPARC64_FPRS_REGNUM].addr;
 148   fprs = get_frame_memory_unsigned (this_frame, addr, 8);
 149   if (fprs & FPRS_FEF)
 150     {
 151       for (regnum = SPARC_F0_REGNUM, addr = mcontext_addr + 32 * 8;
 152            regnum <= SPARC_F31_REGNUM; regnum++, addr += 4)
 153         cache->saved_regs[regnum].addr = addr;
 154
 155       for (regnum = SPARC64_F32_REGNUM;
 156            regnum <= SPARC64_F62_REGNUM; regnum++, addr += 8)
 157         cache->saved_regs[regnum].addr = addr;
 158     }
 159
 160   return cache;
 161 }
 162
 163 static void
 164 sparc64fbsd_sigtramp_frame_this_id (struct frame_info *this_frame,
 165                                     void **this_cache,
 166                                     struct frame_id *this_id)
 167 {
 168   struct sparc_frame_cache *cache =
 169     sparc64fbsd_sigtramp_frame_cache (this_frame, this_cache);
 170
 171   (*this_id) = frame_id_build (cache->base, cache->pc);
 172 }
 173
 174 static struct value *
 175 sparc64fbsd_sigtramp_frame_prev_register (struct frame_info *this_frame,
 176                                           void **this_cache, int regnum)
 177 {
 178   struct sparc_frame_cache *cache =
 179     sparc64fbsd_sigtramp_frame_cache (this_frame, this_cache);
 180
 181   return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum);
 182 }
 183
 184 static int
 185 sparc64fbsd_sigtramp_frame_sniffer (const struct frame_unwind *self,
 186                                     struct frame_info *this_frame,
 187                                     void **this_cache)
 188 {
 189   CORE_ADDR pc = get_frame_pc (this_frame);
 190   const char *name;
 191
 192   find_pc_partial_function (pc, &name, NULL, NULL);
 193   if (sparc64fbsd_pc_in_sigtramp (pc, name))
 194     return 1;
 195
 196   return 0;
 197 }
 198
 199 static const struct frame_unwind sparc64fbsd_sigtramp_frame_unwind =
 200 {
 201   SIGTRAMP_FRAME,
 202   default_frame_unwind_stop_reason,
 203   sparc64fbsd_sigtramp_frame_this_id,
 204   sparc64fbsd_sigtramp_frame_prev_register,
 205   NULL,
 206   sparc64fbsd_sigtramp_frame_sniffer
 207 };
 208 \f
 209
 210 static const struct regset sparc64fbsd_gregset =
 211   {
 212     NULL, sparc64fbsd_supply_gregset, sparc64fbsd_collect_gregset
 213   };
 214
 215 static const struct regset sparc64fbsd_fpregset =
 216   {
 217     NULL, sparc64fbsd_supply_fpregset, sparc64fbsd_collect_fpregset
 218   };
 219
 220 static void
 221 sparc64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 222 {
 223   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 224
 225   /* Generic FreeBSD support. */
 226   fbsd_init_abi (info, gdbarch);
 227
 228   tdep->gregset = &sparc64fbsd_gregset;
 229   tdep->sizeof_gregset = 256;
 230
 231   tdep->fpregset = &sparc64fbsd_fpregset;
 232   tdep->sizeof_fpregset = 272;
 233
 234   frame_unwind_append_unwinder (gdbarch, &sparc64fbsd_sigtramp_frame_unwind);
 235
 236   sparc64_init_abi (info, gdbarch);
 237
 238   /* FreeBSD/sparc64 has SVR4-style shared libraries.  */
 239   set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
 240   set_solib_svr4_fetch_link_map_offsets
 241     (gdbarch, svr4_lp64_fetch_link_map_offsets);
 242 }
 243
 244 void
 245 _initialize_sparc64fbsd_tdep (void)
 246 {
 247   gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
 248                           GDB_OSABI_FREEBSD, sparc64fbsd_init_abi);
 249 }