| 1 | /* Target-dependent code for GNU/Linux Super-H. |
| 2 | |
| 3 | Copyright (C) 2005-2019 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 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 198 | |
| 199 | /* Remember regset characteristics. The sizes should match |
| 200 | elf_gregset_t and elf_fpregset_t from Linux. */ |
| 201 | tdep->core_gregmap = (struct sh_corefile_regmap *) gregs_table; |
| 202 | tdep->sizeof_gregset = 92; |
| 203 | tdep->core_fpregmap = (struct sh_corefile_regmap *) fpregs_table; |
| 204 | tdep->sizeof_fpregset = 136; |
| 205 | |
| 206 | tramp_frame_prepend_unwinder (gdbarch, &sh_linux_sigreturn_tramp_frame); |
| 207 | tramp_frame_prepend_unwinder (gdbarch, &sh_linux_rt_sigreturn_tramp_frame); |
| 208 | } |
| 209 | |
| 210 | void |
| 211 | _initialize_sh_linux_tdep (void) |
| 212 | { |
| 213 | gdbarch_register_osabi (bfd_arch_sh, 0, GDB_OSABI_LINUX, sh_linux_init_abi); |
| 214 | } |