gdb/sparc64-sol2-tdep.c

   1 /* Target-dependent code for Solaris UltraSPARC.
   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 "gdbarch.h"
  24 #include "symtab.h"
  25 #include "objfiles.h"
  26 #include "osabi.h"
  27 #include "trad-frame.h"
  28 #include "regset.h"
  29
  30 #include "sol2-tdep.h"
  31 #include "sparc64-tdep.h"
  32 #include "solib-svr4.h"
  33
  34 /* From <sys/regset.h>.  */
  35 const struct sparc_gregmap sparc64_sol2_gregmap =
  36 {
  37   32 * 8,                       /* "tstate" */
  38   33 * 8,                       /* %pc */
  39   34 * 8,                       /* %npc */
  40   35 * 8,                       /* %y */
  41   -1,                           /* %wim */
  42   -1,                           /* %tbr */
  43   1 * 8,                        /* %g1 */
  44   16 * 8,                       /* %l0 */
  45   8                             /* sizeof (%y) */
  46 };
  47
  48 const struct sparc_fpregmap sparc64_sol2_fpregmap =
  49 {
  50   0 * 8,                        /* %f0 */
  51   33 * 8,                       /* %fsr */
  52 };
  53
  54 static void
  55 sparc64_sol2_supply_core_gregset (const struct regset *regset,
  56                                   struct regcache *regcache,
  57                                   int regnum, const void *gregs, size_t len)
  58 {
  59   sparc64_supply_gregset (&sparc64_sol2_gregmap, regcache, regnum, gregs);
  60 }
  61
  62 static void
  63 sparc64_sol2_collect_core_gregset (const struct regset *regset,
  64                                    const struct regcache *regcache,
  65                                    int regnum, void *gregs, size_t len)
  66 {
  67   sparc64_collect_gregset (&sparc64_sol2_gregmap, regcache, regnum, gregs);
  68 }
  69
  70 static void
  71 sparc64_sol2_supply_core_fpregset (const struct regset *regset,
  72                                    struct regcache *regcache,
  73                                    int regnum, const void *fpregs, size_t len)
  74 {
  75   sparc64_supply_fpregset (&sparc64_sol2_fpregmap, regcache, regnum, fpregs);
  76 }
  77
  78 static void
  79 sparc64_sol2_collect_core_fpregset (const struct regset *regset,
  80                                     const struct regcache *regcache,
  81                                     int regnum, void *fpregs, size_t len)
  82 {
  83   sparc64_collect_fpregset (&sparc64_sol2_fpregmap, regcache, regnum, fpregs);
  84 }
  85
  86 static const struct regset sparc64_sol2_gregset =
  87   {
  88     NULL,
  89     sparc64_sol2_supply_core_gregset,
  90     sparc64_sol2_collect_core_gregset
  91   };
  92
  93 static const struct regset sparc64_sol2_fpregset =
  94   {
  95     NULL,
  96     sparc64_sol2_supply_core_fpregset,
  97     sparc64_sol2_collect_core_fpregset
  98   };
  99 \f
 100
 101 static struct sparc_frame_cache *
 102 sparc64_sol2_sigtramp_frame_cache (struct frame_info *this_frame,
 103                                    void **this_cache)
 104 {
 105   struct sparc_frame_cache *cache;
 106   CORE_ADDR mcontext_addr, addr;
 107   int regnum;
 108
 109   if (*this_cache)
 110     return (struct sparc_frame_cache *) *this_cache;
 111
 112   cache = sparc_frame_cache (this_frame, this_cache);
 113   gdb_assert (cache == *this_cache);
 114
 115   cache->saved_regs = trad_frame_alloc_saved_regs (this_frame);
 116
 117   /* The third argument is a pointer to an instance of `ucontext_t',
 118      which has a member `uc_mcontext' that contains the saved
 119      registers.  */
 120   regnum =
 121     (cache->copied_regs_mask & 0x04) ? SPARC_I2_REGNUM : SPARC_O2_REGNUM;
 122   mcontext_addr = get_frame_register_unsigned (this_frame, regnum) + 64;
 123
 124   cache->saved_regs[SPARC64_CCR_REGNUM].addr = mcontext_addr + 0 * 8;
 125   cache->saved_regs[SPARC64_PC_REGNUM].addr = mcontext_addr + 1 * 8;
 126   cache->saved_regs[SPARC64_NPC_REGNUM].addr = mcontext_addr + 2 * 8;
 127   cache->saved_regs[SPARC64_Y_REGNUM].addr = mcontext_addr + 3 * 8;
 128   cache->saved_regs[SPARC64_ASI_REGNUM].addr = mcontext_addr + 19 * 8;
 129   cache->saved_regs[SPARC64_FPRS_REGNUM].addr = mcontext_addr + 20 * 8;
 130
 131   /* Since %g0 is always zero, keep the identity encoding.  */
 132   for (regnum = SPARC_G1_REGNUM, addr = mcontext_addr + 4 * 8;
 133        regnum <= SPARC_O7_REGNUM; regnum++, addr += 8)
 134     cache->saved_regs[regnum].addr = addr;
 135
 136   if (get_frame_memory_unsigned (this_frame, mcontext_addr + 21 * 8, 8))
 137     {
 138       /* The register windows haven't been flushed.  */
 139       for (regnum = SPARC_L0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++)
 140         trad_frame_set_unknown (cache->saved_regs, regnum);
 141     }
 142   else
 143     {
 144       CORE_ADDR sp;
 145
 146       addr = cache->saved_regs[SPARC_SP_REGNUM].addr;
 147       sp = get_frame_memory_unsigned (this_frame, addr, 8);
 148       for (regnum = SPARC_L0_REGNUM, addr = sp + BIAS;
 149            regnum <= SPARC_I7_REGNUM; regnum++, addr += 8)
 150         cache->saved_regs[regnum].addr = addr;
 151     }
 152
 153   return cache;
 154 }
 155
 156 static void
 157 sparc64_sol2_sigtramp_frame_this_id (struct frame_info *this_frame,
 158                                      void **this_cache,
 159                                      struct frame_id *this_id)
 160 {
 161   struct sparc_frame_cache *cache =
 162     sparc64_sol2_sigtramp_frame_cache (this_frame, this_cache);
 163
 164   (*this_id) = frame_id_build (cache->base, cache->pc);
 165 }
 166
 167 static struct value *
 168 sparc64_sol2_sigtramp_frame_prev_register (struct frame_info *this_frame,
 169                                            void **this_cache,
 170                                            int regnum)
 171 {
 172   struct sparc_frame_cache *cache =
 173     sparc64_sol2_sigtramp_frame_cache (this_frame, this_cache);
 174
 175   return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum);
 176 }
 177
 178 static int
 179 sparc64_sol2_sigtramp_frame_sniffer (const struct frame_unwind *self,
 180                                      struct frame_info *this_frame,
 181                                      void **this_cache)
 182 {
 183   return sol2_sigtramp_p (this_frame);
 184 }
 185
 186 static const struct frame_unwind sparc64_sol2_sigtramp_frame_unwind =
 187 {
 188   SIGTRAMP_FRAME,
 189   default_frame_unwind_stop_reason,
 190   sparc64_sol2_sigtramp_frame_this_id,
 191   sparc64_sol2_sigtramp_frame_prev_register,
 192   NULL,
 193   sparc64_sol2_sigtramp_frame_sniffer
 194 };
 195
 196 \f
 197
 198 static void
 199 sparc64_sol2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 200 {
 201   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 202
 203   tdep->gregset = &sparc64_sol2_gregset;
 204   tdep->sizeof_gregset = 304;
 205
 206   tdep->fpregset = &sparc64_sol2_fpregset;
 207   tdep->sizeof_fpregset = 544;
 208
 209   frame_unwind_append_unwinder (gdbarch, &sparc64_sol2_sigtramp_frame_unwind);
 210
 211   sparc64_init_abi (info, gdbarch);
 212
 213   sol2_init_abi (info, gdbarch);
 214
 215   /* Solaris has SVR4-style shared libraries...  */
 216   set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
 217   set_solib_svr4_fetch_link_map_offsets
 218     (gdbarch, svr4_lp64_fetch_link_map_offsets);
 219
 220   /* ...which means that we need some special handling when doing
 221      prologue analysis.  */
 222   tdep->plt_entry_size = 16;
 223
 224   /* Solaris has kernel-assisted single-stepping support.  */
 225   set_gdbarch_software_single_step (gdbarch, NULL);
 226 }
 227
 228 void _initialize_sparc64_sol2_tdep ();
 229 void
 230 _initialize_sparc64_sol2_tdep ()
 231 {
 232   gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
 233                           GDB_OSABI_SOLARIS, sparc64_sol2_init_abi);
 234 }