gdb/sparc-sol2-tdep.c

   1 /* Target-dependent code for Solaris SPARC.
   2
   3    Copyright (C) 2003-2021 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 "symtab.h"
  25 #include "objfiles.h"
  26 #include "osabi.h"
  27 #include "regcache.h"
  28 #include "regset.h"
  29 #include "target.h"
  30 #include "trad-frame.h"
  31
  32 #include "sol2-tdep.h"
  33 #include "sparc-tdep.h"
  34 #include "solib-svr4.h"
  35
  36 /* From <sys/regset.h>.  */
  37 const struct sparc_gregmap sparc32_sol2_gregmap =
  38 {
  39   32 * 4,                       /* %psr */
  40   33 * 4,                       /* %pc */
  41   34 * 4,                       /* %npc */
  42   35 * 4,                       /* %y */
  43   36 * 4,                       /* %wim */
  44   37 * 4,                       /* %tbr */
  45   1 * 4,                        /* %g1 */
  46   16 * 4,                       /* %l0 */
  47 };
  48
  49 const struct sparc_fpregmap sparc32_sol2_fpregmap =
  50 {
  51   0 * 4,                        /* %f0 */
  52   33 * 4,                       /* %fsr */
  53 };
  54
  55 static void
  56 sparc32_sol2_supply_core_gregset (const struct regset *regset,
  57                                   struct regcache *regcache,
  58                                   int regnum, const void *gregs, size_t len)
  59 {
  60   sparc32_supply_gregset (&sparc32_sol2_gregmap, regcache, regnum, gregs);
  61 }
  62
  63 static void
  64 sparc32_sol2_collect_core_gregset (const struct regset *regset,
  65                                    const struct regcache *regcache,
  66                                    int regnum, void *gregs, size_t len)
  67 {
  68   sparc32_collect_gregset (&sparc32_sol2_gregmap, regcache, regnum, gregs);
  69 }
  70
  71 static void
  72 sparc32_sol2_supply_core_fpregset (const struct regset *regset,
  73                                    struct regcache *regcache,
  74                                    int regnum, const void *fpregs, size_t len)
  75 {
  76   sparc32_supply_fpregset (&sparc32_sol2_fpregmap, regcache, regnum, fpregs);
  77 }
  78
  79 static void
  80 sparc32_sol2_collect_core_fpregset (const struct regset *regset,
  81                                     const struct regcache *regcache,
  82                                     int regnum, void *fpregs, size_t len)
  83 {
  84   sparc32_collect_fpregset (&sparc32_sol2_fpregmap, regcache, regnum, fpregs);
  85 }
  86
  87 static const struct regset sparc32_sol2_gregset =
  88   {
  89     NULL,
  90     sparc32_sol2_supply_core_gregset,
  91     sparc32_sol2_collect_core_gregset
  92   };
  93
  94 static const struct regset sparc32_sol2_fpregset =
  95   {
  96     NULL,
  97     sparc32_sol2_supply_core_fpregset,
  98     sparc32_sol2_collect_core_fpregset
  99   };
 100 \f
 101
 102 static struct sparc_frame_cache *
 103 sparc32_sol2_sigtramp_frame_cache (struct frame_info *this_frame,
 104                                    void **this_cache)
 105 {
 106   struct sparc_frame_cache *cache;
 107   CORE_ADDR mcontext_addr, addr;
 108   int regnum;
 109
 110   if (*this_cache)
 111     return (struct sparc_frame_cache *) *this_cache;
 112
 113   cache = sparc_frame_cache (this_frame, this_cache);
 114   gdb_assert (cache == *this_cache);
 115
 116   cache->saved_regs = trad_frame_alloc_saved_regs (this_frame);
 117
 118   /* The third argument is a pointer to an instance of `ucontext_t',
 119      which has a member `uc_mcontext' that contains the saved
 120      registers.  */
 121   regnum =
 122     (cache->copied_regs_mask & 0x04) ? SPARC_I2_REGNUM : SPARC_O2_REGNUM;
 123   mcontext_addr = get_frame_register_unsigned (this_frame, regnum) + 40;
 124
 125   cache->saved_regs[SPARC32_PSR_REGNUM].addr = mcontext_addr + 0 * 4;
 126   cache->saved_regs[SPARC32_PC_REGNUM].addr = mcontext_addr + 1 * 4;
 127   cache->saved_regs[SPARC32_NPC_REGNUM].addr = mcontext_addr + 2 * 4;
 128   cache->saved_regs[SPARC32_Y_REGNUM].addr = mcontext_addr + 3 * 4;
 129
 130   /* Since %g0 is always zero, keep the identity encoding.  */
 131   for (regnum = SPARC_G1_REGNUM, addr = mcontext_addr + 4 * 4;
 132        regnum <= SPARC_O7_REGNUM; regnum++, addr += 4)
 133     cache->saved_regs[regnum].addr = addr;
 134
 135   if (get_frame_memory_unsigned (this_frame, mcontext_addr + 19 * 4, 4))
 136     {
 137       /* The register windows haven't been flushed.  */
 138       for (regnum = SPARC_L0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++)
 139         trad_frame_set_unknown (cache->saved_regs, regnum);
 140     }
 141   else
 142     {
 143       addr = cache->saved_regs[SPARC_SP_REGNUM].addr;
 144       addr = get_frame_memory_unsigned (this_frame, addr, 4);
 145       for (regnum = SPARC_L0_REGNUM;
 146            regnum <= SPARC_I7_REGNUM; regnum++, addr += 4)
 147         cache->saved_regs[regnum].addr = addr;
 148     }
 149
 150   return cache;
 151 }
 152
 153 static void
 154 sparc32_sol2_sigtramp_frame_this_id (struct frame_info *this_frame,
 155                                      void **this_cache,
 156                                      struct frame_id *this_id)
 157 {
 158   struct sparc_frame_cache *cache =
 159     sparc32_sol2_sigtramp_frame_cache (this_frame, this_cache);
 160
 161   (*this_id) = frame_id_build (cache->base, cache->pc);
 162 }
 163
 164 static struct value *
 165 sparc32_sol2_sigtramp_frame_prev_register (struct frame_info *this_frame,
 166                                            void **this_cache,
 167                                            int regnum)
 168 {
 169   struct sparc_frame_cache *cache =
 170     sparc32_sol2_sigtramp_frame_cache (this_frame, this_cache);
 171
 172   return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum);
 173 }
 174
 175 static int
 176 sparc32_sol2_sigtramp_frame_sniffer (const struct frame_unwind *self,
 177                                      struct frame_info *this_frame,
 178                                      void **this_cache)
 179 {
 180   return sol2_sigtramp_p (this_frame);
 181 }
 182
 183 static const struct frame_unwind sparc32_sol2_sigtramp_frame_unwind =
 184 {
 185   SIGTRAMP_FRAME,
 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   struct gdbarch_tdep *tdep = 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 }