gnu/dist/gdb6/gdb/sparc64fbsd-tdep.c

   1 /* Target-dependent code for FreeBSD/sparc64.
   2
   3    Copyright (C) 2003, 2004, 2005 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 2 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, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20    Boston, MA 02110-1301, USA.  */
  21
  22 #include "defs.h"
  23 #include "frame.h"
  24 #include "frame-unwind.h"
  25 #include "gdbcore.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 "gdb_assert.h"
  33 #include "gdb_string.h"
  34
  35 #include "sparc64-tdep.h"
  36 #include "solib-svr4.h"
  37
  38 /* From <machine/reg.h>.  */
  39 const struct sparc_gregset sparc64fbsd_gregset =
  40 {
  41   26 * 8,                       /* "tstate" */
  42   25 * 8,                       /* %pc */
  43   24 * 8,                       /* %npc */
  44   28 * 8,                       /* %y */
  45   16 * 8,                       /* %fprs */
  46   -1,
  47   1 * 8,                        /* %g1 */
  48   -1,                           /* %l0 */
  49   8                             /* sizeof (%y) */
  50 };
  51 \f
  52
  53 static void
  54 sparc64fbsd_supply_gregset (const struct regset *regset,
  55                             struct regcache *regcache,
  56                             int regnum, const void *gregs, size_t len)
  57 {
  58   sparc64_supply_gregset (&sparc64fbsd_gregset, regcache, regnum, gregs);
  59 }
  60
  61 static void
  62 sparc64fbsd_collect_gregset (const struct regset *regset,
  63                              const struct regcache *regcache,
  64                              int regnum, void *gregs, size_t len)
  65 {
  66   sparc64_collect_gregset (&sparc64fbsd_gregset, regcache, regnum, gregs);
  67 }
  68
  69 static void
  70 sparc64fbsd_supply_fpregset (const struct regset *regset,
  71                              struct regcache *regcache,
  72                              int regnum, const void *fpregs, size_t len)
  73 {
  74   sparc64_supply_fpregset (regcache, regnum, fpregs);
  75 }
  76
  77 static void
  78 sparc64fbsd_collect_fpregset (const struct regset *regset,
  79                               const struct regcache *regcache,
  80                               int regnum, void *fpregs, size_t len)
  81 {
  82   sparc64_collect_fpregset (regcache, regnum, fpregs);
  83 }
  84 \f
  85
  86 /* Signal trampolines.  */
  87
  88 static int
  89 sparc64fbsd_pc_in_sigtramp (CORE_ADDR pc, char *name)
  90 {
  91   return (name && strcmp (name, "__sigtramp") == 0);
  92 }
  93
  94 static struct sparc_frame_cache *
  95 sparc64fbsd_sigtramp_frame_cache (struct frame_info *next_frame,
  96                                    void **this_cache)
  97 {
  98   struct sparc_frame_cache *cache;
  99   CORE_ADDR addr, mcontext_addr, sp;
 100   LONGEST fprs;
 101   int regnum;
 102
 103   if (*this_cache)
 104     return *this_cache;
 105
 106   cache = sparc_frame_cache (next_frame, this_cache);
 107   gdb_assert (cache == *this_cache);
 108
 109   cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
 110
 111   /* The third argument is a pointer to an instance of `ucontext_t',
 112      which has a member `uc_mcontext' that contains the saved
 113      registers.  */
 114   addr = frame_unwind_register_unsigned (next_frame, SPARC_O2_REGNUM);
 115   mcontext_addr = addr + 64;
 116
 117   /* The following registers travel in the `mc_local' slots of
 118      `mcontext_t'.  */
 119   addr = mcontext_addr + 16 * 8;
 120   cache->saved_regs[SPARC64_FPRS_REGNUM].addr = addr + 0 * 8;
 121   cache->saved_regs[SPARC64_FSR_REGNUM].addr = addr + 1 * 8;
 122
 123   /* The following registers travel in the `mc_in' slots of
 124      `mcontext_t'.  */
 125   addr = mcontext_addr + 24 * 8;
 126   cache->saved_regs[SPARC64_NPC_REGNUM].addr = addr + 0 * 8;
 127   cache->saved_regs[SPARC64_PC_REGNUM].addr = addr + 1 * 8;
 128   cache->saved_regs[SPARC64_STATE_REGNUM].addr = addr + 2 * 8;
 129   cache->saved_regs[SPARC64_Y_REGNUM].addr = addr + 4 * 8;
 130
 131   /* The `global' and `out' registers travel in the `mc_global' and
 132      `mc_out' slots of `mcontext_t', except for %g0.  Since %g0 is
 133      always zero, keep the identity encoding.  */
 134   for (regnum = SPARC_G1_REGNUM, addr = mcontext_addr + 8;
 135        regnum <= SPARC_O7_REGNUM; regnum++, addr += 8)
 136     cache->saved_regs[regnum].addr = addr;
 137
 138   /* The `local' and `in' registers have been saved in the register
 139      save area.  */
 140   addr = cache->saved_regs[SPARC_SP_REGNUM].addr;
 141   sp = get_frame_memory_unsigned (next_frame, addr, 8);
 142   for (regnum = SPARC_L0_REGNUM, addr = sp + BIAS;
 143        regnum <= SPARC_I7_REGNUM; regnum++, addr += 8)
 144     cache->saved_regs[regnum].addr = addr;
 145
 146   /* The floating-point registers are only saved if the FEF bit in
 147      %fprs has been set.  */
 148
 149 #define FPRS_FEF        (1 << 2)
 150
 151   addr = cache->saved_regs[SPARC64_FPRS_REGNUM].addr;
 152   fprs = get_frame_memory_unsigned (next_frame, addr, 8);
 153   if (fprs & FPRS_FEF)
 154     {
 155       for (regnum = SPARC_F0_REGNUM, addr = mcontext_addr + 32 * 8;
 156            regnum <= SPARC_F31_REGNUM; regnum++, addr += 4)
 157         cache->saved_regs[regnum].addr = addr;
 158
 159       for (regnum = SPARC64_F32_REGNUM;
 160            regnum <= SPARC64_F62_REGNUM; regnum++, addr += 8)
 161         cache->saved_regs[regnum].addr = addr;
 162     }
 163
 164   return cache;
 165 }
 166
 167 static void
 168 sparc64fbsd_sigtramp_frame_this_id (struct frame_info *next_frame,
 169                                     void **this_cache,
 170                                     struct frame_id *this_id)
 171 {
 172   struct sparc_frame_cache *cache =
 173     sparc64fbsd_sigtramp_frame_cache (next_frame, this_cache);
 174
 175   (*this_id) = frame_id_build (cache->base, cache->pc);
 176 }
 177
 178 static void
 179 sparc64fbsd_sigtramp_frame_prev_register (struct frame_info *next_frame,
 180                                           void **this_cache,
 181                                           int regnum, int *optimizedp,
 182                                           enum lval_type *lvalp,
 183                                           CORE_ADDR *addrp,
 184                                           int *realnump, gdb_byte *valuep)
 185 {
 186   struct sparc_frame_cache *cache =
 187     sparc64fbsd_sigtramp_frame_cache (next_frame, this_cache);
 188
 189   trad_frame_get_prev_register (next_frame, cache->saved_regs, regnum,
 190                                 optimizedp, lvalp, addrp, realnump, valuep);
 191 }
 192
 193 static const struct frame_unwind sparc64fbsd_sigtramp_frame_unwind =
 194 {
 195   SIGTRAMP_FRAME,
 196   sparc64fbsd_sigtramp_frame_this_id,
 197   sparc64fbsd_sigtramp_frame_prev_register
 198 };
 199
 200 static const struct frame_unwind *
 201 sparc64fbsd_sigtramp_frame_sniffer (struct frame_info *next_frame)
 202 {
 203   CORE_ADDR pc = frame_pc_unwind (next_frame);
 204   char *name;
 205
 206   find_pc_partial_function (pc, &name, NULL, NULL);
 207   if (sparc64fbsd_pc_in_sigtramp (pc, name))
 208     return &sparc64fbsd_sigtramp_frame_unwind;
 209
 210   return NULL;
 211 }
 212 \f
 213
 214 static void
 215 sparc64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 216 {
 217   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 218
 219   tdep->gregset = regset_alloc (gdbarch, sparc64fbsd_supply_gregset,
 220                                 sparc64fbsd_collect_gregset);
 221   tdep->sizeof_gregset = 256;
 222
 223   tdep->fpregset = regset_alloc (gdbarch, sparc64fbsd_supply_fpregset,
 224                                  sparc64fbsd_collect_fpregset);
 225   tdep->sizeof_fpregset = 272;
 226
 227   frame_unwind_append_sniffer (gdbarch, sparc64fbsd_sigtramp_frame_sniffer);
 228
 229   sparc64_init_abi (info, gdbarch);
 230
 231   /* FreeBSD/sparc64 has SVR4-style shared libraries.  */
 232   set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
 233   set_solib_svr4_fetch_link_map_offsets
 234     (gdbarch, svr4_lp64_fetch_link_map_offsets);
 235 }
 236
 237 /* Provide a prototype to silence -Wmissing-prototypes.  */
 238 void _initialize_sparc64fbsd_tdep (void);
 239
 240 void
 241 _initialize_sparc64fbsd_tdep (void)
 242 {
 243   gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
 244                           GDB_OSABI_FREEBSD_ELF, sparc64fbsd_init_abi);
 245 }