1/* Target-dependent code for GNU/Linux Super-H. 2 3 Copyright (C) 2005-2023 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#include "gdbarch.h" 33 34#define REGSx16(base) \ 35 {(base), 0}, \ 36 {(base) + 1, 4}, \ 37 {(base) + 2, 8}, \ 38 {(base) + 3, 12}, \ 39 {(base) + 4, 16}, \ 40 {(base) + 5, 20}, \ 41 {(base) + 6, 24}, \ 42 {(base) + 7, 28}, \ 43 {(base) + 8, 32}, \ 44 {(base) + 9, 36}, \ 45 {(base) + 10, 40}, \ 46 {(base) + 11, 44}, \ 47 {(base) + 12, 48}, \ 48 {(base) + 13, 52}, \ 49 {(base) + 14, 56}, \ 50 {(base) + 15, 60} 51 52/* Describe the contents of the .reg section of the core file. */ 53 54static const struct sh_corefile_regmap gregs_table[] = 55{ 56 REGSx16 (R0_REGNUM), 57 {PC_REGNUM, 64}, 58 {PR_REGNUM, 68}, 59 {SR_REGNUM, 72}, 60 {GBR_REGNUM, 76}, 61 {MACH_REGNUM, 80}, 62 {MACL_REGNUM, 84}, 63 {-1 /* Terminator. */, 0} 64}; 65 66/* Describe the contents of the .reg2 section of the core file. */ 67 68static const struct sh_corefile_regmap fpregs_table[] = 69{ 70 REGSx16 (FR0_REGNUM), 71 /* REGSx16 xfp_regs omitted. */ 72 {FPSCR_REGNUM, 128}, 73 {FPUL_REGNUM, 132}, 74 {-1 /* Terminator. */, 0} 75}; 76 77/* SH signal handler frame support. */ 78 79static void 80sh_linux_sigtramp_cache (frame_info_ptr this_frame, 81 struct trad_frame_cache *this_cache, 82 CORE_ADDR func, int regs_offset) 83{ 84 int i; 85 struct gdbarch *gdbarch = get_frame_arch (this_frame); 86 CORE_ADDR base = get_frame_register_unsigned (this_frame, 87 gdbarch_sp_regnum (gdbarch)); 88 CORE_ADDR regs = base + regs_offset; 89 90 for (i = 0; i < 18; i++) 91 trad_frame_set_reg_addr (this_cache, i, regs + i * 4); 92 93 trad_frame_set_reg_addr (this_cache, SR_REGNUM, regs + 18 * 4); 94 trad_frame_set_reg_addr (this_cache, GBR_REGNUM, regs + 19 * 4); 95 trad_frame_set_reg_addr (this_cache, MACH_REGNUM, regs + 20 * 4); 96 trad_frame_set_reg_addr (this_cache, MACL_REGNUM, regs + 21 * 4); 97 98 /* Restore FP state if we have an FPU. */ 99 if (gdbarch_fp0_regnum (gdbarch) != -1) 100 { 101 CORE_ADDR fpregs = regs + 22 * 4; 102 for (i = FR0_REGNUM; i <= FP_LAST_REGNUM; i++) 103 trad_frame_set_reg_addr (this_cache, i, fpregs + i * 4); 104 trad_frame_set_reg_addr (this_cache, FPSCR_REGNUM, fpregs + 32 * 4); 105 trad_frame_set_reg_addr (this_cache, FPUL_REGNUM, fpregs + 33 * 4); 106 } 107 108 /* Save a frame ID. */ 109 trad_frame_set_id (this_cache, frame_id_build (base, func)); 110} 111 112/* Implement struct tramp_frame "init" callbacks for signal 113 trampolines on 32-bit SH. */ 114 115static void 116sh_linux_sigreturn_init (const struct tramp_frame *self, 117 frame_info_ptr this_frame, 118 struct trad_frame_cache *this_cache, 119 CORE_ADDR func) 120{ 121 /* SH 32-bit sigframe: sigcontext at start of sigframe, 122 registers start after a single 'oldmask' word. */ 123 sh_linux_sigtramp_cache (this_frame, this_cache, func, 4); 124} 125 126static void 127sh_linux_rt_sigreturn_init (const struct tramp_frame *self, 128 frame_info_ptr this_frame, 129 struct trad_frame_cache *this_cache, 130 CORE_ADDR func) 131{ 132 /* SH 32-bit rt_sigframe: starts with a siginfo (128 bytes), then 133 we can find sigcontext embedded within a ucontext (offset 20 bytes). 134 Then registers start after a single 'oldmask' word. */ 135 sh_linux_sigtramp_cache (this_frame, this_cache, func, 136 128 /* sizeof (struct siginfo) */ 137 + 20 /* offsetof (struct ucontext, uc_mcontext) */ 138 + 4 /* oldmask word at start of sigcontext */); 139} 140 141/* Instruction patterns. */ 142#define SH_MOVW 0x9305 143#define SH_TRAP 0xc300 144#define SH_OR_R0_R0 0x200b 145 146/* SH sigreturn syscall numbers. */ 147#define SH_NR_SIGRETURN 0x0077 148#define SH_NR_RT_SIGRETURN 0x00ad 149 150static struct tramp_frame sh_linux_sigreturn_tramp_frame = { 151 SIGTRAMP_FRAME, 152 2, 153 { 154 { SH_MOVW, 0xffff }, 155 { SH_TRAP, 0xff00 }, /* #imm argument part filtered out. */ 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_OR_R0_R0, 0xffff }, 161 { SH_NR_SIGRETURN, 0xffff }, 162 { TRAMP_SENTINEL_INSN } 163 }, 164 sh_linux_sigreturn_init 165}; 166 167static struct tramp_frame sh_linux_rt_sigreturn_tramp_frame = { 168 SIGTRAMP_FRAME, 169 2, 170 { 171 { SH_MOVW, 0xffff }, 172 { SH_TRAP, 0xff00 }, /* #imm argument part filtered out. */ 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_OR_R0_R0, 0xffff }, 178 { SH_NR_RT_SIGRETURN, 0xffff }, 179 { TRAMP_SENTINEL_INSN } 180 }, 181 sh_linux_rt_sigreturn_init 182}; 183 184static void 185sh_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) 186{ 187 linux_init_abi (info, gdbarch, 0); 188 189 /* GNU/Linux uses SVR4-style shared libraries. */ 190 set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); 191 set_solib_svr4_fetch_link_map_offsets 192 (gdbarch, linux_ilp32_fetch_link_map_offsets); 193 set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver); 194 195 set_gdbarch_fetch_tls_load_module_address (gdbarch, 196 svr4_fetch_objfile_link_map); 197 198 sh_gdbarch_tdep *tdep = gdbarch_tdep<sh_gdbarch_tdep> (gdbarch); 199 200 /* Remember regset characteristics. The sizes should match 201 elf_gregset_t and elf_fpregset_t from Linux. */ 202 tdep->core_gregmap = (struct sh_corefile_regmap *) gregs_table; 203 tdep->sizeof_gregset = 92; 204 tdep->core_fpregmap = (struct sh_corefile_regmap *) fpregs_table; 205 tdep->sizeof_fpregset = 136; 206 207 tramp_frame_prepend_unwinder (gdbarch, &sh_linux_sigreturn_tramp_frame); 208 tramp_frame_prepend_unwinder (gdbarch, &sh_linux_rt_sigreturn_tramp_frame); 209} 210 211void _initialize_sh_linux_tdep (); 212void 213_initialize_sh_linux_tdep () 214{ 215 gdbarch_register_osabi (bfd_arch_sh, 0, GDB_OSABI_LINUX, sh_linux_init_abi); 216} 217