gdb/tilegx-linux-tdep.c

   1 /* Target-dependent code for GNU/Linux on Tilera TILE-Gx processors.
   2
   3    Copyright 2012-2013 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 "osabi.h"
  22 #include "linux-tdep.h"
  23 #include "glibc-tdep.h"
  24 #include "solib-svr4.h"
  25 #include "symtab.h"
  26 #include "regcache.h"
  27 #include "regset.h"
  28 #include "tramp-frame.h"
  29 #include "trad-frame.h"
  30 #include "tilegx-tdep.h"
  31
  32 /* Signal trampoline support.  */
  33
  34 static void
  35 tilegx_linux_sigframe_init (const struct tramp_frame *self,
  36                             struct frame_info *this_frame,
  37                             struct trad_frame_cache *this_cache,
  38                             CORE_ADDR func)
  39 {
  40   CORE_ADDR pc = get_frame_register_unsigned (this_frame, 64);
  41   CORE_ADDR sp = get_frame_register_unsigned (this_frame, 54);
  42
  43   /* Base address of register save area.  */
  44   CORE_ADDR base = sp
  45                    + 16    /* Skip ABI_SAVE_AREA.  */
  46                    + 128   /* Skip SIGINFO.  */
  47                    + 40;   /* Skip UCONTEXT.  */
  48
  49   /* Address of saved LR register (R56) which holds previous PC.  */
  50   CORE_ADDR prev_pc = base + 56 * 8;
  51
  52   int i;
  53
  54   for (i = 0; i < 56; i++)
  55     trad_frame_set_reg_addr (this_cache, i, base + i * 8);
  56
  57   trad_frame_set_reg_value (this_cache, 64,
  58                             get_frame_memory_unsigned (this_frame, prev_pc, 8));
  59
  60   /* Save a frame ID.  */
  61   trad_frame_set_id (this_cache, frame_id_build (base, func));
  62 }
  63
  64 static const struct tramp_frame tilegx_linux_rt_sigframe =
  65 {
  66   SIGTRAMP_FRAME,
  67   8,
  68   {
  69     { 0x00045fe551483000ULL, -1 }, /* { moveli r10, 139 } */
  70     { 0x286b180051485000ULL, -1 }, /* { swint1 } */
  71     { TRAMP_SENTINEL_INSN, -1 }
  72   },
  73   tilegx_linux_sigframe_init
  74 };
  75
  76 /* Supply raw registers from REGCACHE to REGS.  */
  77
  78 static void
  79 tilegx_linux_supply_regset (const struct regset *regset,
  80                             struct regcache *regcache,
  81                             int regnum, const void *regs, size_t len)
  82 {
  83   struct gdbarch *arch = get_regcache_arch (regcache);
  84   const char *ptr = regs;
  85   int i;
  86
  87   /* This logic must match that of struct pt_regs in "ptrace.h".  */
  88   for (i = 0; i < TILEGX_NUM_EASY_REGS + 1; i++, ptr += tilegx_reg_size)
  89     {
  90       int gri = (i < TILEGX_NUM_EASY_REGS) ? i : TILEGX_PC_REGNUM;
  91
  92       if (regnum == gri || regnum == -1)
  93         regcache_raw_supply (regcache, gri, ptr);
  94     }
  95 }
  96
  97 /* TILE-Gx Linux kernel register set.  */
  98 static struct regset tilegx_linux_regset =
  99 {
 100   NULL,
 101   tilegx_linux_supply_regset
 102 };
 103
 104 static const struct regset *
 105 tilegx_regset_from_core_section (struct gdbarch *gdbarch,
 106                                  const char *sect_name,
 107                                  size_t sect_size)
 108 {
 109   if (strcmp (sect_name, ".reg") == 0)
 110     return &tilegx_linux_regset;
 111
 112   return NULL;
 113 }
 114
 115 /* OS specific initialization of gdbarch.  */
 116
 117 static void
 118 tilegx_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 119 {
 120   int arch_size = gdbarch_addr_bit (gdbarch);
 121
 122   linux_init_abi (info, gdbarch);
 123
 124   tramp_frame_prepend_unwinder (gdbarch, &tilegx_linux_rt_sigframe);
 125
 126   set_gdbarch_regset_from_core_section (gdbarch,
 127                                         tilegx_regset_from_core_section);
 128
 129   /* GNU/Linux uses SVR4-style shared libraries.  */
 130   if (arch_size == 32)
 131     set_solib_svr4_fetch_link_map_offsets (gdbarch,
 132                                            svr4_ilp32_fetch_link_map_offsets);
 133   else
 134     set_solib_svr4_fetch_link_map_offsets (gdbarch,
 135                                            svr4_lp64_fetch_link_map_offsets);
 136
 137   /* Enable TLS support.  */
 138   set_gdbarch_fetch_tls_load_module_address (gdbarch,
 139                                              svr4_fetch_objfile_link_map);
 140
 141   /* Shared library handling.  */
 142   set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
 143   set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver);
 144
 145   set_gdbarch_get_siginfo_type (gdbarch, linux_get_siginfo_type);
 146 }
 147
 148 /* Provide a prototype to silence -Wmissing-prototypes.  */
 149 extern initialize_file_ftype _initialize_tilegx_linux_tdep;
 150
 151 void
 152 _initialize_tilegx_linux_tdep (void)
 153 {
 154   gdbarch_register_osabi (bfd_arch_tilegx, bfd_mach_tilegx, GDB_OSABI_LINUX,
 155                           tilegx_linux_init_abi);
 156 }