1 /* Target-dependent code for GNU/Linux Super-H. 2 3 Copyright (C) 2005-2017 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 23 #include "solib-svr4.h" 24 #include "symtab.h" 25 26 #include "trad-frame.h" 27 #include "tramp-frame.h" 28 29 #include "glibc-tdep.h" 30 #include "sh-tdep.h" 31 #include "linux-tdep.h" 32 33 #define REGSx16(base) \ 34 {(base), 0}, \ 35 {(base) + 1, 4}, \ 36 {(base) + 2, 8}, \ 37 {(base) + 3, 12}, \ 38 {(base) + 4, 16}, \ 39 {(base) + 5, 20}, \ 40 {(base) + 6, 24}, \ 41 {(base) + 7, 28}, \ 42 {(base) + 8, 32}, \ 43 {(base) + 9, 36}, \ 44 {(base) + 10, 40}, \ 45 {(base) + 11, 44}, \ 46 {(base) + 12, 48}, \ 47 {(base) + 13, 52}, \ 48 {(base) + 14, 56}, \ 49 {(base) + 15, 60} 50 51 /* Describe the contents of the .reg section of the core file. */ 52 53 static const struct sh_corefile_regmap gregs_table[] = 54 { 55 REGSx16 (R0_REGNUM), 56 {PC_REGNUM, 64}, 57 {PR_REGNUM, 68}, 58 {SR_REGNUM, 72}, 59 {GBR_REGNUM, 76}, 60 {MACH_REGNUM, 80}, 61 {MACL_REGNUM, 84}, 62 {-1 /* Terminator. */, 0} 63 }; 64 65 /* Describe the contents of the .reg2 section of the core file. */ 66 67 static const struct sh_corefile_regmap fpregs_table[] = 68 { 69 REGSx16 (FR0_REGNUM), 70 /* REGSx16 xfp_regs omitted. */ 71 {FPSCR_REGNUM, 128}, 72 {FPUL_REGNUM, 132}, 73 {-1 /* Terminator. */, 0} 74 }; 75 76 /* SH signal handler frame support. */ 77 78 static void 79 sh_linux_sigtramp_cache (struct frame_info *this_frame, 80 struct trad_frame_cache *this_cache, 81 CORE_ADDR func, int regs_offset) 82 { 83 int i; 84 struct gdbarch *gdbarch = get_frame_arch (this_frame); 85 CORE_ADDR base = get_frame_register_unsigned (this_frame, 86 gdbarch_sp_regnum (gdbarch)); 87 CORE_ADDR regs = base + regs_offset; 88 89 for (i = 0; i < 18; i++) 90 trad_frame_set_reg_addr (this_cache, i, regs + i * 4); 91 92 trad_frame_set_reg_addr (this_cache, SR_REGNUM, regs + 18 * 4); 93 trad_frame_set_reg_addr (this_cache, GBR_REGNUM, regs + 19 * 4); 94 trad_frame_set_reg_addr (this_cache, MACH_REGNUM, regs + 20 * 4); 95 trad_frame_set_reg_addr (this_cache, MACL_REGNUM, regs + 21 * 4); 96 97 /* Restore FP state if we have an FPU. */ 98 if (gdbarch_fp0_regnum (gdbarch) != -1) 99 { 100 CORE_ADDR fpregs = regs + 22 * 4; 101 for (i = FR0_REGNUM; i <= FP_LAST_REGNUM; i++) 102 trad_frame_set_reg_addr (this_cache, i, fpregs + i * 4); 103 trad_frame_set_reg_addr (this_cache, FPSCR_REGNUM, fpregs + 32 * 4); 104 trad_frame_set_reg_addr (this_cache, FPUL_REGNUM, fpregs + 33 * 4); 105 } 106 107 /* Save a frame ID. */ 108 trad_frame_set_id (this_cache, frame_id_build (base, func)); 109 } 110 111 /* Implement struct tramp_frame "init" callbacks for signal 112 trampolines on 32-bit SH. */ 113 114 static void 115 sh_linux_sigreturn_init (const struct tramp_frame *self, 116 struct frame_info *this_frame, 117 struct trad_frame_cache *this_cache, 118 CORE_ADDR func) 119 { 120 /* SH 32-bit sigframe: sigcontext at start of sigframe, 121 registers start after a single 'oldmask' word. */ 122 sh_linux_sigtramp_cache (this_frame, this_cache, func, 4); 123 } 124 125 static void 126 sh_linux_rt_sigreturn_init (const struct tramp_frame *self, 127 struct frame_info *this_frame, 128 struct trad_frame_cache *this_cache, 129 CORE_ADDR func) 130 { 131 /* SH 32-bit rt_sigframe: starts with a siginfo (128 bytes), then 132 we can find sigcontext embedded within a ucontext (offset 20 bytes). 133 Then registers start after a single 'oldmask' word. */ 134 sh_linux_sigtramp_cache (this_frame, this_cache, func, 135 128 /* sizeof (struct siginfo) */ 136 + 20 /* offsetof (struct ucontext, uc_mcontext) */ 137 + 4 /* oldmask word at start of sigcontext */); 138 } 139 140 /* Instruction patterns. */ 141 #define SH_MOVW 0x9305 142 #define SH_TRAP 0xc300 143 #define SH_OR_R0_R0 0x200b 144 145 /* SH sigreturn syscall numbers. */ 146 #define SH_NR_SIGRETURN 0x0077 147 #define SH_NR_RT_SIGRETURN 0x00ad 148 149 static struct tramp_frame sh_linux_sigreturn_tramp_frame = { 150 SIGTRAMP_FRAME, 151 2, 152 { 153 { SH_MOVW, 0xffff }, 154 { SH_TRAP, 0xff00 }, /* #imm argument part filtered out. */ 155 { SH_OR_R0_R0, 0xffff }, 156 { SH_OR_R0_R0, 0xffff }, 157 { SH_OR_R0_R0, 0xffff }, 158 { SH_OR_R0_R0, 0xffff }, 159 { SH_OR_R0_R0, 0xffff }, 160 { SH_NR_SIGRETURN, 0xffff }, 161 { TRAMP_SENTINEL_INSN } 162 }, 163 sh_linux_sigreturn_init 164 }; 165 166 static struct tramp_frame sh_linux_rt_sigreturn_tramp_frame = { 167 SIGTRAMP_FRAME, 168 2, 169 { 170 { SH_MOVW, 0xffff }, 171 { SH_TRAP, 0xff00 }, /* #imm argument part filtered out. */ 172 { SH_OR_R0_R0, 0xffff }, 173 { SH_OR_R0_R0, 0xffff }, 174 { SH_OR_R0_R0, 0xffff }, 175 { SH_OR_R0_R0, 0xffff }, 176 { SH_OR_R0_R0, 0xffff }, 177 { SH_NR_RT_SIGRETURN, 0xffff }, 178 { TRAMP_SENTINEL_INSN } 179 }, 180 sh_linux_rt_sigreturn_init 181 }; 182 183 static void 184 sh_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) 185 { 186 linux_init_abi (info, gdbarch); 187 188 /* GNU/Linux uses SVR4-style shared libraries. */ 189 set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); 190 set_solib_svr4_fetch_link_map_offsets 191 (gdbarch, svr4_ilp32_fetch_link_map_offsets); 192 set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver); 193 194 set_gdbarch_fetch_tls_load_module_address (gdbarch, 195 svr4_fetch_objfile_link_map); 196 197 /* Core files and signal handler frame unwinding are supported for 198 32-bit SH only, at present. */ 199 if (info.bfd_arch_info->mach != bfd_mach_sh5) 200 { 201 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); 202 203 /* Remember regset characteristics. The sizes should match 204 elf_gregset_t and elf_fpregset_t from Linux. */ 205 tdep->core_gregmap = (struct sh_corefile_regmap *)gregs_table; 206 tdep->sizeof_gregset = 92; 207 tdep->core_fpregmap = (struct sh_corefile_regmap *)fpregs_table; 208 tdep->sizeof_fpregset = 136; 209 210 tramp_frame_prepend_unwinder (gdbarch, &sh_linux_sigreturn_tramp_frame); 211 tramp_frame_prepend_unwinder (gdbarch, &sh_linux_rt_sigreturn_tramp_frame); 212 } 213 } 214 215 /* Provide a prototype to silence -Wmissing-prototypes. */ 216 extern void _initialize_sh_linux_tdep (void); 217 218 void 219 _initialize_sh_linux_tdep (void) 220 { 221 gdbarch_register_osabi (bfd_arch_sh, 0, GDB_OSABI_LINUX, sh_linux_init_abi); 222 } 223