1 /* Target-dependent code for GNU/Linux on Tilera TILE-Gx processors. 2 3 Copyright (C) 2012-2017 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 /* Provide a prototype to silence -Wmissing-prototypes. */ 138 extern initialize_file_ftype _initialize_tilegx_linux_tdep; 139 140 void 141 _initialize_tilegx_linux_tdep (void) 142 { 143 gdbarch_register_osabi (bfd_arch_tilegx, bfd_mach_tilegx, GDB_OSABI_LINUX, 144 tilegx_linux_init_abi); 145 } 146