gdb/sparc64-linux-tdep.c

   1 /* Target-dependent code for GNU/Linux UltraSPARC.
   2
   3    Copyright (C) 2003, 2004, 2005, 2007 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 "dwarf2-frame.h"
  26 #include "regset.h"
  27 #include "regcache.h"
  28 #include "gdbarch.h"
  29 #include "gdbcore.h"
  30 #include "osabi.h"
  31 #include "solib-svr4.h"
  32 #include "symtab.h"
  33 #include "trad-frame.h"
  34 #include "tramp-frame.h"
  35
  36 #include "sparc64-tdep.h"
  37
  38 /* Signal trampoline support.  */
  39
  40 static void sparc64_linux_sigframe_init (const struct tramp_frame *self,
  41                                          struct frame_info *next_frame,
  42                                          struct trad_frame_cache *this_cache,
  43                                          CORE_ADDR func);
  44
  45 /* See sparc-linux-tdep.c for details.  Note that 64-bit binaries only
  46    use RT signals.  */
  47
  48 static const struct tramp_frame sparc64_linux_rt_sigframe =
  49 {
  50   SIGTRAMP_FRAME,
  51   4,
  52   {
  53     { 0x82102065, -1 },         /* mov __NR_rt_sigreturn, %g1 */
  54     { 0x91d0206d, -1 },         /* ta  0x6d */
  55     { TRAMP_SENTINEL_INSN, -1 }
  56   },
  57   sparc64_linux_sigframe_init
  58 };
  59
  60 static void
  61 sparc64_linux_sigframe_init (const struct tramp_frame *self,
  62                              struct frame_info *next_frame,
  63                              struct trad_frame_cache *this_cache,
  64                              CORE_ADDR func)
  65 {
  66   CORE_ADDR base, addr, sp_addr;
  67   int regnum;
  68
  69   base = frame_unwind_register_unsigned (next_frame, SPARC_O1_REGNUM);
  70   base += 128;
  71
  72   /* Offsets from <bits/sigcontext.h>.  */
  73
  74   /* Since %g0 is always zero, keep the identity encoding.  */
  75   addr = base + 8;
  76   sp_addr = base + ((SPARC_SP_REGNUM - SPARC_G0_REGNUM) * 8);
  77   for (regnum = SPARC_G1_REGNUM; regnum <= SPARC_O7_REGNUM; regnum++)
  78     {
  79       trad_frame_set_reg_addr (this_cache, regnum, addr);
  80       addr += 8;
  81     }
  82
  83   trad_frame_set_reg_addr (this_cache, SPARC64_STATE_REGNUM, addr + 0);
  84   trad_frame_set_reg_addr (this_cache, SPARC64_PC_REGNUM, addr + 8);
  85   trad_frame_set_reg_addr (this_cache, SPARC64_NPC_REGNUM, addr + 16);
  86   trad_frame_set_reg_addr (this_cache, SPARC64_Y_REGNUM, addr + 24);
  87   trad_frame_set_reg_addr (this_cache, SPARC64_FPRS_REGNUM, addr + 28);
  88
  89   base = frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM);
  90   if (base & 1)
  91     base += BIAS;
  92
  93   addr = get_frame_memory_unsigned (next_frame, sp_addr, 8);
  94   if (addr & 1)
  95     addr += BIAS;
  96
  97   for (regnum = SPARC_L0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++)
  98     {
  99       trad_frame_set_reg_addr (this_cache, regnum, addr);
 100       addr += 8;
 101     }
 102   trad_frame_set_id (this_cache, frame_id_build (base, func));
 103 }
 104 \f
 105 /* Return the address of a system call's alternative return
 106    address.  */
 107
 108 static CORE_ADDR
 109 sparc64_linux_step_trap (unsigned long insn)
 110 {
 111   if (insn == 0x91d0206d)
 112     {
 113       ULONGEST sp;
 114
 115       regcache_cooked_read_unsigned (current_regcache,
 116                                      SPARC_SP_REGNUM, &sp);
 117       if (sp & 1)
 118         sp += BIAS;
 119
 120       /* The kernel puts the sigreturn registers on the stack,
 121          and this is where the signal unwinding state is take from
 122          when returning from a signal.
 123
 124          A siginfo_t sits 192 bytes from the base of the stack.  This
 125          siginfo_t is 128 bytes, and is followed by the sigreturn
 126          register save area.  The saved PC sits at a 136 byte offset
 127          into there.  */
 128
 129       return read_memory_unsigned_integer (sp + 192 + 128 + 136, 8);
 130     }
 131
 132   return 0;
 133 }
 134 \f
 135
 136 const struct sparc_gregset sparc64_linux_core_gregset =
 137 {
 138   32 * 8,                       /* %tstate */
 139   33 * 8,                       /* %tpc */
 140   34 * 8,                       /* %tnpc */
 141   35 * 8,                       /* %y */
 142   -1,                           /* %wim */
 143   -1,                           /* %tbr */
 144   1 * 8,                        /* %g1 */
 145   16 * 8,                       /* %l0 */
 146   8,                            /* y size */
 147 };
 148 \f
 149
 150 static void
 151 sparc64_linux_supply_core_gregset (const struct regset *regset,
 152                                    struct regcache *regcache,
 153                                    int regnum, const void *gregs, size_t len)
 154 {
 155   sparc64_supply_gregset (&sparc64_linux_core_gregset, regcache, regnum, gregs);
 156 }
 157
 158 static void
 159 sparc64_linux_collect_core_gregset (const struct regset *regset,
 160                                     const struct regcache *regcache,
 161                                     int regnum, void *gregs, size_t len)
 162 {
 163   sparc64_collect_gregset (&sparc64_linux_core_gregset, regcache, regnum, gregs);
 164 }
 165
 166 static void
 167 sparc64_linux_supply_core_fpregset (const struct regset *regset,
 168                                     struct regcache *regcache,
 169                                     int regnum, const void *fpregs, size_t len)
 170 {
 171   sparc64_supply_fpregset (regcache, regnum, fpregs);
 172 }
 173
 174 static void
 175 sparc64_linux_collect_core_fpregset (const struct regset *regset,
 176                                      const struct regcache *regcache,
 177                                      int regnum, void *fpregs, size_t len)
 178 {
 179   sparc64_collect_fpregset (regcache, regnum, fpregs);
 180 }
 181
 182 \f
 183
 184 static void
 185 sparc64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 186 {
 187   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 188
 189   tdep->gregset = regset_alloc (gdbarch, sparc64_linux_supply_core_gregset,
 190                                 sparc64_linux_collect_core_gregset);
 191   tdep->sizeof_gregset = 288;
 192
 193   tdep->fpregset = regset_alloc (gdbarch, sparc64_linux_supply_core_fpregset,
 194                                  sparc64_linux_collect_core_fpregset);
 195   tdep->sizeof_fpregset = 280;
 196
 197   tramp_frame_prepend_unwinder (gdbarch, &sparc64_linux_rt_sigframe);
 198
 199   /* Hook in the DWARF CFI frame unwinder.  */
 200   frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer);
 201
 202   sparc64_init_abi (info, gdbarch);
 203
 204   /* GNU/Linux has SVR4-style shared libraries...  */
 205   set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
 206   set_solib_svr4_fetch_link_map_offsets
 207     (gdbarch, svr4_lp64_fetch_link_map_offsets);
 208
 209   /* ...which means that we need some special handling when doing
 210      prologue analysis.  */
 211   tdep->plt_entry_size = 16;
 212
 213   /* Enable TLS support.  */
 214   set_gdbarch_fetch_tls_load_module_address (gdbarch,
 215                                              svr4_fetch_objfile_link_map);
 216
 217   /* Make sure we can single-step over signal return system calls.  */
 218   tdep->step_trap = sparc64_linux_step_trap;
 219 }
 220 \f
 221
 222 /* Provide a prototype to silence -Wmissing-prototypes.  */
 223 extern void _initialize_sparc64_linux_tdep (void);
 224
 225 void
 226 _initialize_sparc64_linux_tdep (void)
 227 {
 228   gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
 229                           GDB_OSABI_LINUX, sparc64_linux_init_abi);
 230 }