gdb/sparc64-linux-tdep.c

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