gdb/tilegx-linux-tdep.c

   1 /* Target-dependent code for GNU/Linux on Tilera TILE-Gx processors.
   2
   3    Copyright (C) 2012-2018 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 sp = get_frame_register_unsigned (this_frame, 54);
  41
  42   /* Base address of register save area.  */
  43   CORE_ADDR base = sp
  44                    + 16    /* Skip ABI_SAVE_AREA.  */
  45                    + 128   /* Skip SIGINFO.  */
  46                    + 40;   /* Skip UCONTEXT.  */
  47
  48   /* Address of saved LR register (R56) which holds previous PC.  */
  49   CORE_ADDR prev_pc = base + 56 * 8;
  50
  51   int i;
  52
  53   for (i = 0; i < 56; i++)
  54     trad_frame_set_reg_addr (this_cache, i, base + i * 8);
  55
  56   trad_frame_set_reg_value (this_cache, 64,
  57                             get_frame_memory_unsigned (this_frame, prev_pc, 8));
  58
  59   /* Save a frame ID.  */
  60   trad_frame_set_id (this_cache, frame_id_build (base, func));
  61 }
  62
  63 static const struct tramp_frame tilegx_linux_rt_sigframe =
  64 {
  65   SIGTRAMP_FRAME,
  66   8,
  67   {
  68     { 0x00045fe551483000ULL, -1 }, /* { moveli r10, 139 } */
  69     { 0x286b180051485000ULL, -1 }, /* { swint1 } */
  70     { TRAMP_SENTINEL_INSN, -1 }
  71   },
  72   tilegx_linux_sigframe_init
  73 };
  74
  75 /* Register map; must match struct pt_regs in "ptrace.h".  */
  76
  77 static const struct regcache_map_entry tilegx_linux_regmap[] =
  78   {
  79     { TILEGX_NUM_EASY_REGS, TILEGX_FIRST_EASY_REGNUM, 8 },
  80     { 1, TILEGX_PC_REGNUM, 8 },
  81     { 1, TILEGX_FAULTNUM_REGNUM, 8 },
  82     { 0 }
  83   };
  84
  85 #define TILEGX_LINUX_SIZEOF_GREGSET (64 * 8)
  86
  87 /* TILE-Gx Linux kernel register set.  */
  88
  89 static const struct regset tilegx_linux_regset =
  90 {
  91   tilegx_linux_regmap,
  92   regcache_supply_regset, regcache_collect_regset
  93 };
  94
  95
  96 static void
  97 tilegx_iterate_over_regset_sections (struct gdbarch *gdbarch,
  98                                      iterate_over_regset_sections_cb *cb,
  99                                      void *cb_data,
 100                                      const struct regcache *regcache)
 101 {
 102   cb (".reg", TILEGX_LINUX_SIZEOF_GREGSET, &tilegx_linux_regset,
 103       NULL, cb_data);
 104 }
 105
 106 /* OS specific initialization of gdbarch.  */
 107
 108 static void
 109 tilegx_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 110 {
 111   int arch_size = gdbarch_addr_bit (gdbarch);
 112
 113   linux_init_abi (info, gdbarch);
 114
 115   tramp_frame_prepend_unwinder (gdbarch, &tilegx_linux_rt_sigframe);
 116
 117   set_gdbarch_iterate_over_regset_sections
 118     (gdbarch, tilegx_iterate_over_regset_sections);
 119
 120   /* GNU/Linux uses SVR4-style shared libraries.  */
 121   if (arch_size == 32)
 122     set_solib_svr4_fetch_link_map_offsets (gdbarch,
 123                                            svr4_ilp32_fetch_link_map_offsets);
 124   else
 125     set_solib_svr4_fetch_link_map_offsets (gdbarch,
 126                                            svr4_lp64_fetch_link_map_offsets);
 127
 128   /* Enable TLS support.  */
 129   set_gdbarch_fetch_tls_load_module_address (gdbarch,
 130                                              svr4_fetch_objfile_link_map);
 131
 132   /* Shared library handling.  */
 133   set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
 134   set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver);
 135 }
 136
 137 void
 138 _initialize_tilegx_linux_tdep (void)
 139 {
 140   gdbarch_register_osabi (bfd_arch_tilegx, bfd_mach_tilegx, GDB_OSABI_LINUX,
 141                           tilegx_linux_init_abi);
 142 }