gdb/sparc64-fbsd-tdep.c

   1 /* Target-dependent code for FreeBSD/sparc64.
   2
   3    Copyright (C) 2003-2020 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 #include "gdbarch.h"
  34
  35 /* From <machine/reg.h>.  */
  36 const struct sparc_gregmap sparc64fbsd_gregmap =
  37 {
  38   26 * 8,                       /* "tstate" */
  39   25 * 8,                       /* %pc */
  40   24 * 8,                       /* %npc */
  41   28 * 8,                       /* %y */
  42   16 * 8,                       /* %fprs */
  43   -1,
  44   1 * 8,                        /* %g1 */
  45   -1,                           /* %l0 */
  46   8                             /* sizeof (%y) */
  47 };
  48 \f
  49
  50 static void
  51 sparc64fbsd_supply_gregset (const struct regset *regset,
  52                             struct regcache *regcache,
  53                             int regnum, const void *gregs, size_t len)
  54 {
  55   sparc64_supply_gregset (&sparc64fbsd_gregmap, regcache, regnum, gregs);
  56 }
  57
  58 static void
  59 sparc64fbsd_collect_gregset (const struct regset *regset,
  60                              const struct regcache *regcache,
  61                              int regnum, void *gregs, size_t len)
  62 {
  63   sparc64_collect_gregset (&sparc64fbsd_gregmap, regcache, regnum, gregs);
  64 }
  65
  66 static void
  67 sparc64fbsd_supply_fpregset (const struct regset *regset,
  68                              struct regcache *regcache,
  69                              int regnum, const void *fpregs, size_t len)
  70 {
  71   sparc64_supply_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs);
  72 }
  73
  74 static void
  75 sparc64fbsd_collect_fpregset (const struct regset *regset,
  76                               const struct regcache *regcache,
  77                               int regnum, void *fpregs, size_t len)
  78 {
  79   sparc64_collect_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs);
  80 }
  81 \f
  82
  83 /* Signal trampolines.  */
  84
  85 static int
  86 sparc64fbsd_pc_in_sigtramp (CORE_ADDR pc, const char *name)
  87 {
  88   return (name && strcmp (name, "__sigtramp") == 0);
  89 }
  90
  91 static struct sparc_frame_cache *
  92 sparc64fbsd_sigtramp_frame_cache (struct frame_info *this_frame,
  93                                    void **this_cache)
  94 {
  95   struct sparc_frame_cache *cache;
  96   CORE_ADDR addr, mcontext_addr, sp;
  97   LONGEST fprs;
  98   int regnum;
  99
 100   if (*this_cache)
 101     return (struct sparc_frame_cache *) *this_cache;
 102
 103   cache = sparc_frame_cache (this_frame, this_cache);
 104   gdb_assert (cache == *this_cache);
 105
 106   cache->saved_regs = trad_frame_alloc_saved_regs (this_frame);
 107
 108   /* The third argument is a pointer to an instance of `ucontext_t',
 109      which has a member `uc_mcontext' that contains the saved
 110      registers.  */
 111   addr = get_frame_register_unsigned (this_frame, SPARC_O2_REGNUM);
 112   mcontext_addr = addr + 64;
 113
 114   /* The following registers travel in the `mc_local' slots of
 115      `mcontext_t'.  */
 116   addr = mcontext_addr + 16 * 8;
 117   cache->saved_regs[SPARC64_FPRS_REGNUM].addr = addr + 0 * 8;
 118   cache->saved_regs[SPARC64_FSR_REGNUM].addr = addr + 1 * 8;
 119
 120   /* The following registers travel in the `mc_in' slots of
 121      `mcontext_t'.  */
 122   addr = mcontext_addr + 24 * 8;
 123   cache->saved_regs[SPARC64_NPC_REGNUM].addr = addr + 0 * 8;
 124   cache->saved_regs[SPARC64_PC_REGNUM].addr = addr + 1 * 8;
 125   cache->saved_regs[SPARC64_STATE_REGNUM].addr = addr + 2 * 8;
 126   cache->saved_regs[SPARC64_Y_REGNUM].addr = addr + 4 * 8;
 127
 128   /* The `global' and `out' registers travel in the `mc_global' and
 129      `mc_out' slots of `mcontext_t', except for %g0.  Since %g0 is
 130      always zero, keep the identity encoding.  */
 131   for (regnum = SPARC_G1_REGNUM, addr = mcontext_addr + 8;
 132        regnum <= SPARC_O7_REGNUM; regnum++, addr += 8)
 133     cache->saved_regs[regnum].addr = addr;
 134
 135   /* The `local' and `in' registers have been saved in the register
 136      save area.  */
 137   addr = cache->saved_regs[SPARC_SP_REGNUM].addr;
 138   sp = get_frame_memory_unsigned (this_frame, addr, 8);
 139   for (regnum = SPARC_L0_REGNUM, addr = sp + BIAS;
 140        regnum <= SPARC_I7_REGNUM; regnum++, addr += 8)
 141     cache->saved_regs[regnum].addr = addr;
 142
 143   /* The floating-point registers are only saved if the FEF bit in
 144      %fprs has been set.  */
 145
 146 #define FPRS_FEF        (1 << 2)
 147
 148   addr = cache->saved_regs[SPARC64_FPRS_REGNUM].addr;
 149   fprs = get_frame_memory_unsigned (this_frame, addr, 8);
 150   if (fprs & FPRS_FEF)
 151     {
 152       for (regnum = SPARC_F0_REGNUM, addr = mcontext_addr + 32 * 8;
 153            regnum <= SPARC_F31_REGNUM; regnum++, addr += 4)
 154         cache->saved_regs[regnum].addr = addr;
 155
 156       for (regnum = SPARC64_F32_REGNUM;
 157            regnum <= SPARC64_F62_REGNUM; regnum++, addr += 8)
 158         cache->saved_regs[regnum].addr = addr;
 159     }
 160
 161   return cache;
 162 }
 163
 164 static void
 165 sparc64fbsd_sigtramp_frame_this_id (struct frame_info *this_frame,
 166                                     void **this_cache,
 167                                     struct frame_id *this_id)
 168 {
 169   struct sparc_frame_cache *cache =
 170     sparc64fbsd_sigtramp_frame_cache (this_frame, this_cache);
 171
 172   (*this_id) = frame_id_build (cache->base, cache->pc);
 173 }
 174
 175 static struct value *
 176 sparc64fbsd_sigtramp_frame_prev_register (struct frame_info *this_frame,
 177                                           void **this_cache, int regnum)
 178 {
 179   struct sparc_frame_cache *cache =
 180     sparc64fbsd_sigtramp_frame_cache (this_frame, this_cache);
 181
 182   return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum);
 183 }
 184
 185 static int
 186 sparc64fbsd_sigtramp_frame_sniffer (const struct frame_unwind *self,
 187                                     struct frame_info *this_frame,
 188                                     void **this_cache)
 189 {
 190   CORE_ADDR pc = get_frame_pc (this_frame);
 191   const char *name;
 192
 193   find_pc_partial_function (pc, &name, NULL, NULL);
 194   if (sparc64fbsd_pc_in_sigtramp (pc, name))
 195     return 1;
 196
 197   return 0;
 198 }
 199
 200 static const struct frame_unwind sparc64fbsd_sigtramp_frame_unwind =
 201 {
 202   SIGTRAMP_FRAME,
 203   default_frame_unwind_stop_reason,
 204   sparc64fbsd_sigtramp_frame_this_id,
 205   sparc64fbsd_sigtramp_frame_prev_register,
 206   NULL,
 207   sparc64fbsd_sigtramp_frame_sniffer
 208 };
 209 \f
 210
 211 static const struct regset sparc64fbsd_gregset =
 212   {
 213     NULL, sparc64fbsd_supply_gregset, sparc64fbsd_collect_gregset
 214   };
 215
 216 static const struct regset sparc64fbsd_fpregset =
 217   {
 218     NULL, sparc64fbsd_supply_fpregset, sparc64fbsd_collect_fpregset
 219   };
 220
 221 static void
 222 sparc64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 223 {
 224   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 225
 226   /* Generic FreeBSD support. */
 227   fbsd_init_abi (info, gdbarch);
 228
 229   tdep->gregset = &sparc64fbsd_gregset;
 230   tdep->sizeof_gregset = 256;
 231
 232   tdep->fpregset = &sparc64fbsd_fpregset;
 233   tdep->sizeof_fpregset = 272;
 234
 235   frame_unwind_append_unwinder (gdbarch, &sparc64fbsd_sigtramp_frame_unwind);
 236
 237   sparc64_init_abi (info, gdbarch);
 238
 239   /* FreeBSD/sparc64 has SVR4-style shared libraries.  */
 240   set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
 241   set_solib_svr4_fetch_link_map_offsets
 242     (gdbarch, svr4_lp64_fetch_link_map_offsets);
 243 }
 244
 245 void _initialize_sparc64fbsd_tdep ();
 246 void
 247 _initialize_sparc64fbsd_tdep ()
 248 {
 249   gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
 250                           GDB_OSABI_FREEBSD, sparc64fbsd_init_abi);
 251 }