| 1 | /* Target-dependent code for GNU/Linux on Tilera TILE-Gx processors. |
| 2 | |
| 3 | Copyright (C) 2012-2020 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 | #include "gdbarch.h" |
| 32 | |
| 33 | /* Signal trampoline support. */ |
| 34 | |
| 35 | static void |
| 36 | tilegx_linux_sigframe_init (const struct tramp_frame *self, |
| 37 | struct frame_info *this_frame, |
| 38 | struct trad_frame_cache *this_cache, |
| 39 | CORE_ADDR func) |
| 40 | { |
| 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, ULONGEST_MAX }, /* { moveli r10, 139 } */ |
| 70 | { 0x286b180051485000ULL, ULONGEST_MAX }, /* { swint1 } */ |
| 71 | { TRAMP_SENTINEL_INSN, ULONGEST_MAX } |
| 72 | }, |
| 73 | tilegx_linux_sigframe_init |
| 74 | }; |
| 75 | |
| 76 | /* Register map; must match struct pt_regs in "ptrace.h". */ |
| 77 | |
| 78 | static const struct regcache_map_entry tilegx_linux_regmap[] = |
| 79 | { |
| 80 | { TILEGX_NUM_EASY_REGS, TILEGX_FIRST_EASY_REGNUM, 8 }, |
| 81 | { 1, TILEGX_PC_REGNUM, 8 }, |
| 82 | { 1, TILEGX_FAULTNUM_REGNUM, 8 }, |
| 83 | { 0 } |
| 84 | }; |
| 85 | |
| 86 | #define TILEGX_LINUX_SIZEOF_GREGSET (64 * 8) |
| 87 | |
| 88 | /* TILE-Gx Linux kernel register set. */ |
| 89 | |
| 90 | static const struct regset tilegx_linux_regset = |
| 91 | { |
| 92 | tilegx_linux_regmap, |
| 93 | regcache_supply_regset, regcache_collect_regset |
| 94 | }; |
| 95 | |
| 96 | |
| 97 | static void |
| 98 | tilegx_iterate_over_regset_sections (struct gdbarch *gdbarch, |
| 99 | iterate_over_regset_sections_cb *cb, |
| 100 | void *cb_data, |
| 101 | const struct regcache *regcache) |
| 102 | { |
| 103 | cb (".reg", TILEGX_LINUX_SIZEOF_GREGSET, TILEGX_LINUX_SIZEOF_GREGSET, |
| 104 | &tilegx_linux_regset, NULL, cb_data); |
| 105 | } |
| 106 | |
| 107 | /* OS specific initialization of gdbarch. */ |
| 108 | |
| 109 | static void |
| 110 | tilegx_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| 111 | { |
| 112 | int arch_size = gdbarch_addr_bit (gdbarch); |
| 113 | |
| 114 | linux_init_abi (info, gdbarch); |
| 115 | |
| 116 | tramp_frame_prepend_unwinder (gdbarch, &tilegx_linux_rt_sigframe); |
| 117 | |
| 118 | set_gdbarch_iterate_over_regset_sections |
| 119 | (gdbarch, tilegx_iterate_over_regset_sections); |
| 120 | |
| 121 | /* GNU/Linux uses SVR4-style shared libraries. */ |
| 122 | if (arch_size == 32) |
| 123 | set_solib_svr4_fetch_link_map_offsets (gdbarch, |
| 124 | svr4_ilp32_fetch_link_map_offsets); |
| 125 | else |
| 126 | set_solib_svr4_fetch_link_map_offsets (gdbarch, |
| 127 | svr4_lp64_fetch_link_map_offsets); |
| 128 | |
| 129 | /* Enable TLS support. */ |
| 130 | set_gdbarch_fetch_tls_load_module_address (gdbarch, |
| 131 | svr4_fetch_objfile_link_map); |
| 132 | |
| 133 | /* Shared library handling. */ |
| 134 | set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); |
| 135 | set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver); |
| 136 | } |
| 137 | |
| 138 | void |
| 139 | _initialize_tilegx_linux_tdep (void) |
| 140 | { |
| 141 | gdbarch_register_osabi (bfd_arch_tilegx, bfd_mach_tilegx, GDB_OSABI_LINUX, |
| 142 | tilegx_linux_init_abi); |
| 143 | } |