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      1 /* Target-dependent code for GNU/Linux on Tilera TILE-Gx processors.
      2 
      3    Copyright (C) 2012-2024 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 "osabi.h"
     21 #include "linux-tdep.h"
     22 #include "glibc-tdep.h"
     23 #include "solib-svr4.h"
     24 #include "symtab.h"
     25 #include "regcache.h"
     26 #include "regset.h"
     27 #include "tramp-frame.h"
     28 #include "trad-frame.h"
     29 #include "tilegx-tdep.h"
     30 #include "gdbarch.h"
     31 
     32 /* Signal trampoline support.  */
     33 
     34 static void
     35 tilegx_linux_sigframe_init (const struct tramp_frame *self,
     36 			    const frame_info_ptr &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, ULONGEST_MAX }, /* { moveli r10, 139 } */
     69     { 0x286b180051485000ULL, ULONGEST_MAX }, /* { swint1 } */
     70     { TRAMP_SENTINEL_INSN, ULONGEST_MAX }
     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_SIZEOF_GREGSET,
    103       &tilegx_linux_regset, 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, 0);
    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 					   linux_ilp32_fetch_link_map_offsets);
    124   else
    125     set_solib_svr4_fetch_link_map_offsets (gdbarch,
    126 					   linux_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 _initialize_tilegx_linux_tdep ();
    138 void
    139 _initialize_tilegx_linux_tdep ()
    140 {
    141   gdbarch_register_osabi (bfd_arch_tilegx, bfd_mach_tilegx, GDB_OSABI_LINUX,
    142 			  tilegx_linux_init_abi);
    143 }
    144