gdb/sparc-sol2-tdep.c

   1 /* Target-dependent code for Solaris SPARC.
   2
   3    Copyright (C) 2003-2024 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 "frame.h"
  21 #include "frame-unwind.h"
  22 #include "gdbcore.h"
  23 #include "symtab.h"
  24 #include "objfiles.h"
  25 #include "osabi.h"
  26 #include "regcache.h"
  27 #include "regset.h"
  28 #include "target.h"
  29 #include "trad-frame.h"
  30
  31 #include "sol2-tdep.h"
  32 #include "sparc-tdep.h"
  33 #include "solib-svr4.h"
  34
  35 /* From <sys/regset.h>.  */
  36 const struct sparc_gregmap sparc32_sol2_gregmap =
  37 {
  38   32 * 4,                       /* %psr */
  39   33 * 4,                       /* %pc */
  40   34 * 4,                       /* %npc */
  41   35 * 4,                       /* %y */
  42   36 * 4,                       /* %wim */
  43   37 * 4,                       /* %tbr */
  44   1 * 4,                        /* %g1 */
  45   16 * 4,                       /* %l0 */
  46 };
  47
  48 const struct sparc_fpregmap sparc32_sol2_fpregmap =
  49 {
  50   0 * 4,                        /* %f0 */
  51   33 * 4,                       /* %fsr */
  52 };
  53
  54 static void
  55 sparc32_sol2_supply_core_gregset (const struct regset *regset,
  56                                   struct regcache *regcache,
  57                                   int regnum, const void *gregs, size_t len)
  58 {
  59   sparc32_supply_gregset (&sparc32_sol2_gregmap, regcache, regnum, gregs);
  60 }
  61
  62 static void
  63 sparc32_sol2_collect_core_gregset (const struct regset *regset,
  64                                    const struct regcache *regcache,
  65                                    int regnum, void *gregs, size_t len)
  66 {
  67   sparc32_collect_gregset (&sparc32_sol2_gregmap, regcache, regnum, gregs);
  68 }
  69
  70 static void
  71 sparc32_sol2_supply_core_fpregset (const struct regset *regset,
  72                                    struct regcache *regcache,
  73                                    int regnum, const void *fpregs, size_t len)
  74 {
  75   sparc32_supply_fpregset (&sparc32_sol2_fpregmap, regcache, regnum, fpregs);
  76 }
  77
  78 static void
  79 sparc32_sol2_collect_core_fpregset (const struct regset *regset,
  80                                     const struct regcache *regcache,
  81                                     int regnum, void *fpregs, size_t len)
  82 {
  83   sparc32_collect_fpregset (&sparc32_sol2_fpregmap, regcache, regnum, fpregs);
  84 }
  85
  86 static const struct regset sparc32_sol2_gregset =
  87   {
  88     NULL,
  89     sparc32_sol2_supply_core_gregset,
  90     sparc32_sol2_collect_core_gregset
  91   };
  92
  93 static const struct regset sparc32_sol2_fpregset =
  94   {
  95     NULL,
  96     sparc32_sol2_supply_core_fpregset,
  97     sparc32_sol2_collect_core_fpregset
  98   };
  99 \f
 100
 101 static struct sparc_frame_cache *
 102 sparc32_sol2_sigtramp_frame_cache (const frame_info_ptr &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) + 40;
 123
 124   cache->saved_regs[SPARC32_PSR_REGNUM].set_addr (mcontext_addr + 0 * 4);
 125   cache->saved_regs[SPARC32_PC_REGNUM].set_addr (mcontext_addr + 1 * 4);
 126   cache->saved_regs[SPARC32_NPC_REGNUM].set_addr (mcontext_addr + 2 * 4);
 127   cache->saved_regs[SPARC32_Y_REGNUM].set_addr (mcontext_addr + 3 * 4);
 128
 129   /* Since %g0 is always zero, keep the identity encoding.  */
 130   for (regnum = SPARC_G1_REGNUM, addr = mcontext_addr + 4 * 4;
 131        regnum <= SPARC_O7_REGNUM; regnum++, addr += 4)
 132     cache->saved_regs[regnum].set_addr (addr);
 133
 134   if (get_frame_memory_unsigned (this_frame, mcontext_addr + 19 * 4, 4))
 135     {
 136       /* The register windows haven't been flushed.  */
 137       for (regnum = SPARC_L0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++)
 138         cache->saved_regs[regnum].set_unknown ();
 139     }
 140   else
 141     {
 142       addr = cache->saved_regs[SPARC_SP_REGNUM].addr ();
 143       addr = get_frame_memory_unsigned (this_frame, addr, 4);
 144       for (regnum = SPARC_L0_REGNUM;
 145            regnum <= SPARC_I7_REGNUM; regnum++, addr += 4)
 146         cache->saved_regs[regnum].set_addr (addr);
 147     }
 148
 149   return cache;
 150 }
 151
 152 static void
 153 sparc32_sol2_sigtramp_frame_this_id (const frame_info_ptr &this_frame,
 154                                      void **this_cache,
 155                                      struct frame_id *this_id)
 156 {
 157   struct sparc_frame_cache *cache =
 158     sparc32_sol2_sigtramp_frame_cache (this_frame, this_cache);
 159
 160   (*this_id) = frame_id_build (cache->base, cache->pc);
 161 }
 162
 163 static struct value *
 164 sparc32_sol2_sigtramp_frame_prev_register (const frame_info_ptr &this_frame,
 165                                            void **this_cache,
 166                                            int regnum)
 167 {
 168   struct sparc_frame_cache *cache =
 169     sparc32_sol2_sigtramp_frame_cache (this_frame, this_cache);
 170
 171   return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum);
 172 }
 173
 174 static int
 175 sparc32_sol2_sigtramp_frame_sniffer (const struct frame_unwind *self,
 176                                      const frame_info_ptr &this_frame,
 177                                      void **this_cache)
 178 {
 179   return sol2_sigtramp_p (this_frame);
 180 }
 181
 182 static const struct frame_unwind_legacy sparc32_sol2_sigtramp_frame_unwind (
 183   "sparc32 solaris sigtramp",
 184   SIGTRAMP_FRAME,
 185   FRAME_UNWIND_ARCH,
 186   default_frame_unwind_stop_reason,
 187   sparc32_sol2_sigtramp_frame_this_id,
 188   sparc32_sol2_sigtramp_frame_prev_register,
 189   NULL,
 190   sparc32_sol2_sigtramp_frame_sniffer
 191 );
 192
 193 \f
 194
 195 static void
 196 sparc32_sol2_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 197 {
 198   sparc_gdbarch_tdep *tdep = gdbarch_tdep<sparc_gdbarch_tdep> (gdbarch);
 199
 200   tdep->gregset = &sparc32_sol2_gregset;
 201   tdep->sizeof_gregset = 152;
 202
 203   tdep->fpregset = &sparc32_sol2_fpregset;
 204   tdep->sizeof_fpregset = 400;
 205
 206   sol2_init_abi (info, gdbarch);
 207
 208   /* Solaris has SVR4-style shared libraries...  */
 209   set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
 210   set_solib_svr4_fetch_link_map_offsets
 211     (gdbarch, svr4_ilp32_fetch_link_map_offsets);
 212
 213   /* ...which means that we need some special handling when doing
 214      prologue analysis.  */
 215   tdep->plt_entry_size = 12;
 216
 217   /* Solaris has kernel-assisted single-stepping support.  */
 218   set_gdbarch_software_single_step (gdbarch, NULL);
 219
 220   frame_unwind_append_unwinder (gdbarch, &sparc32_sol2_sigtramp_frame_unwind);
 221 }
 222
 223 void _initialize_sparc_sol2_tdep ();
 224 void
 225 _initialize_sparc_sol2_tdep ()
 226 {
 227   gdbarch_register_osabi (bfd_arch_sparc, 0,
 228                           GDB_OSABI_SOLARIS, sparc32_sol2_init_abi);
 229 }