| 1 | /* Native-dependent code for BSD Unix running on ARM's, for GDB. |
| 2 | |
| 3 | Copyright (C) 1988-2020 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 | /* We define this to get types like register_t. */ |
| 21 | #define _KERNTYPES |
| 22 | #include "defs.h" |
| 23 | #include "gdbcore.h" |
| 24 | #include "inferior.h" |
| 25 | #include "regcache.h" |
| 26 | #include "target.h" |
| 27 | #include <sys/types.h> |
| 28 | #include <sys/ptrace.h> |
| 29 | #include <sys/sysctl.h> |
| 30 | #include <machine/reg.h> |
| 31 | #include <machine/frame.h> |
| 32 | |
| 33 | #include "arm-tdep.h" |
| 34 | #include "arm-nbsd-tdep.h" |
| 35 | #include "aarch32-tdep.h" |
| 36 | #include "inf-ptrace.h" |
| 37 | #include "nbsd-nat.h" |
| 38 | |
| 39 | class arm_netbsd_nat_target final : public nbsd_nat_target |
| 40 | { |
| 41 | public: |
| 42 | /* Add our register access methods. */ |
| 43 | void fetch_registers (struct regcache *, int) override; |
| 44 | void store_registers (struct regcache *, int) override; |
| 45 | const struct target_desc *read_description () override; |
| 46 | }; |
| 47 | |
| 48 | static arm_netbsd_nat_target the_arm_netbsd_nat_target; |
| 49 | |
| 50 | static void |
| 51 | arm_supply_vfpregset (struct regcache *regcache, struct fpreg *fpregset) |
| 52 | { |
| 53 | struct gdbarch_tdep *tdep = gdbarch_tdep (regcache->arch ()); |
| 54 | if (tdep->vfp_register_count == 0) |
| 55 | return; |
| 56 | |
| 57 | struct vfpreg &vfp = fpregset->fpr_vfp; |
| 58 | for (int regno = 0; regno <= tdep->vfp_register_count; regno++) |
| 59 | regcache->raw_supply (regno + ARM_D0_REGNUM, (char *) &vfp.vfp_regs[regno]); |
| 60 | |
| 61 | regcache->raw_supply (ARM_FPSCR_REGNUM, (char *) &vfp.vfp_fpscr); |
| 62 | } |
| 63 | |
| 64 | static void |
| 65 | fetch_register (struct regcache *regcache, int regno) |
| 66 | { |
| 67 | struct reg inferior_registers; |
| 68 | int ret; |
| 69 | int lwp = regcache->ptid ().lwp (); |
| 70 | |
| 71 | ret = ptrace (PT_GETREGS, regcache->ptid ().pid (), |
| 72 | (PTRACE_TYPE_ARG3) &inferior_registers, lwp); |
| 73 | |
| 74 | if (ret < 0) |
| 75 | { |
| 76 | warning (_("unable to fetch general register")); |
| 77 | return; |
| 78 | } |
| 79 | arm_nbsd_supply_gregset (nullptr, regcache, regno, &inferior_registers, |
| 80 | sizeof (inferior_registers)); |
| 81 | } |
| 82 | |
| 83 | static void |
| 84 | fetch_fp_register (struct regcache *regcache, int regno) |
| 85 | { |
| 86 | struct fpreg inferior_fp_registers; |
| 87 | int lwp = regcache->ptid ().lwp (); |
| 88 | |
| 89 | int ret = ptrace (PT_GETFPREGS, regcache->ptid ().pid (), |
| 90 | (PTRACE_TYPE_ARG3) &inferior_fp_registers, lwp); |
| 91 | |
| 92 | struct vfpreg &vfp = inferior_fp_registers.fpr_vfp; |
| 93 | |
| 94 | if (ret < 0) |
| 95 | { |
| 96 | warning (_("unable to fetch floating-point register")); |
| 97 | return; |
| 98 | } |
| 99 | |
| 100 | struct gdbarch_tdep *tdep = gdbarch_tdep (regcache->arch ()); |
| 101 | if (regno == ARM_FPSCR_REGNUM && tdep->vfp_register_count != 0) |
| 102 | regcache->raw_supply (ARM_FPSCR_REGNUM, (char *) &vfp.vfp_fpscr); |
| 103 | else if (regno >= ARM_D0_REGNUM |
| 104 | && regno <= ARM_D0_REGNUM + tdep->vfp_register_count) |
| 105 | { |
| 106 | regcache->raw_supply (regno, |
| 107 | (char *) &vfp.vfp_regs[regno - ARM_D0_REGNUM]); |
| 108 | } |
| 109 | else |
| 110 | warning (_("Invalid register number.")); |
| 111 | } |
| 112 | |
| 113 | static void |
| 114 | fetch_fp_regs (struct regcache *regcache) |
| 115 | { |
| 116 | struct fpreg inferior_fp_registers; |
| 117 | int lwp = regcache->ptid ().lwp (); |
| 118 | int ret; |
| 119 | int regno; |
| 120 | |
| 121 | ret = ptrace (PT_GETFPREGS, regcache->ptid ().pid (), |
| 122 | (PTRACE_TYPE_ARG3) &inferior_fp_registers, lwp); |
| 123 | |
| 124 | if (ret < 0) |
| 125 | { |
| 126 | warning (_("unable to fetch general registers")); |
| 127 | return; |
| 128 | } |
| 129 | |
| 130 | arm_supply_vfpregset (regcache, &inferior_fp_registers); |
| 131 | } |
| 132 | |
| 133 | void |
| 134 | arm_netbsd_nat_target::fetch_registers (struct regcache *regcache, int regno) |
| 135 | { |
| 136 | if (regno >= 0) |
| 137 | { |
| 138 | if (regno < ARM_F0_REGNUM || regno > ARM_FPS_REGNUM) |
| 139 | fetch_register (regcache, regno); |
| 140 | else |
| 141 | fetch_fp_register (regcache, regno); |
| 142 | } |
| 143 | else |
| 144 | { |
| 145 | fetch_register (regcache, -1); |
| 146 | fetch_fp_regs (regcache); |
| 147 | } |
| 148 | } |
| 149 | |
| 150 | |
| 151 | static void |
| 152 | store_register (const struct regcache *regcache, int regno) |
| 153 | { |
| 154 | struct gdbarch *gdbarch = regcache->arch (); |
| 155 | struct reg inferior_registers; |
| 156 | int lwp = regcache->ptid ().lwp (); |
| 157 | int ret; |
| 158 | |
| 159 | ret = ptrace (PT_GETREGS, regcache->ptid ().pid (), |
| 160 | (PTRACE_TYPE_ARG3) &inferior_registers, lwp); |
| 161 | |
| 162 | if (ret < 0) |
| 163 | { |
| 164 | warning (_("unable to fetch general registers")); |
| 165 | return; |
| 166 | } |
| 167 | |
| 168 | switch (regno) |
| 169 | { |
| 170 | case ARM_SP_REGNUM: |
| 171 | regcache->raw_collect (ARM_SP_REGNUM, (char *) &inferior_registers.r_sp); |
| 172 | break; |
| 173 | |
| 174 | case ARM_LR_REGNUM: |
| 175 | regcache->raw_collect (ARM_LR_REGNUM, (char *) &inferior_registers.r_lr); |
| 176 | break; |
| 177 | |
| 178 | case ARM_PC_REGNUM: |
| 179 | if (arm_apcs_32) |
| 180 | regcache->raw_collect (ARM_PC_REGNUM, |
| 181 | (char *) &inferior_registers.r_pc); |
| 182 | else |
| 183 | { |
| 184 | unsigned pc_val; |
| 185 | |
| 186 | regcache->raw_collect (ARM_PC_REGNUM, (char *) &pc_val); |
| 187 | |
| 188 | pc_val = gdbarch_addr_bits_remove (gdbarch, pc_val); |
| 189 | inferior_registers.r_pc ^= gdbarch_addr_bits_remove |
| 190 | (gdbarch, inferior_registers.r_pc); |
| 191 | inferior_registers.r_pc |= pc_val; |
| 192 | } |
| 193 | break; |
| 194 | |
| 195 | case ARM_PS_REGNUM: |
| 196 | if (arm_apcs_32) |
| 197 | regcache->raw_collect (ARM_PS_REGNUM, |
| 198 | (char *) &inferior_registers.r_cpsr); |
| 199 | else |
| 200 | { |
| 201 | unsigned psr_val; |
| 202 | |
| 203 | regcache->raw_collect (ARM_PS_REGNUM, (char *) &psr_val); |
| 204 | |
| 205 | psr_val ^= gdbarch_addr_bits_remove (gdbarch, psr_val); |
| 206 | inferior_registers.r_pc = gdbarch_addr_bits_remove |
| 207 | (gdbarch, inferior_registers.r_pc); |
| 208 | inferior_registers.r_pc |= psr_val; |
| 209 | } |
| 210 | break; |
| 211 | |
| 212 | default: |
| 213 | regcache->raw_collect (regno, (char *) &inferior_registers.r[regno]); |
| 214 | break; |
| 215 | } |
| 216 | |
| 217 | ret = ptrace (PT_SETREGS, regcache->ptid ().pid (), |
| 218 | (PTRACE_TYPE_ARG3) &inferior_registers, lwp); |
| 219 | |
| 220 | if (ret < 0) |
| 221 | warning (_("unable to write register %d to inferior"), regno); |
| 222 | } |
| 223 | |
| 224 | static void |
| 225 | store_regs (const struct regcache *regcache) |
| 226 | { |
| 227 | struct gdbarch *gdbarch = regcache->arch (); |
| 228 | struct reg inferior_registers; |
| 229 | int lwp = regcache->ptid ().lwp (); |
| 230 | int ret; |
| 231 | int regno; |
| 232 | |
| 233 | |
| 234 | for (regno = ARM_A1_REGNUM; regno < ARM_SP_REGNUM; regno++) |
| 235 | regcache->raw_collect (regno, (char *) &inferior_registers.r[regno]); |
| 236 | |
| 237 | regcache->raw_collect (ARM_SP_REGNUM, (char *) &inferior_registers.r_sp); |
| 238 | regcache->raw_collect (ARM_LR_REGNUM, (char *) &inferior_registers.r_lr); |
| 239 | |
| 240 | if (arm_apcs_32) |
| 241 | { |
| 242 | regcache->raw_collect (ARM_PC_REGNUM, (char *) &inferior_registers.r_pc); |
| 243 | regcache->raw_collect (ARM_PS_REGNUM, |
| 244 | (char *) &inferior_registers.r_cpsr); |
| 245 | } |
| 246 | else |
| 247 | { |
| 248 | unsigned pc_val; |
| 249 | unsigned psr_val; |
| 250 | |
| 251 | regcache->raw_collect (ARM_PC_REGNUM, (char *) &pc_val); |
| 252 | regcache->raw_collect (ARM_PS_REGNUM, (char *) &psr_val); |
| 253 | |
| 254 | pc_val = gdbarch_addr_bits_remove (gdbarch, pc_val); |
| 255 | psr_val ^= gdbarch_addr_bits_remove (gdbarch, psr_val); |
| 256 | |
| 257 | inferior_registers.r_pc = pc_val | psr_val; |
| 258 | } |
| 259 | |
| 260 | ret = ptrace (PT_SETREGS, regcache->ptid ().pid (), |
| 261 | (PTRACE_TYPE_ARG3) &inferior_registers, lwp); |
| 262 | |
| 263 | if (ret < 0) |
| 264 | warning (_("unable to store general registers")); |
| 265 | } |
| 266 | |
| 267 | static void |
| 268 | store_fp_register (const struct regcache *regcache, int regno) |
| 269 | { |
| 270 | struct fpreg inferior_fp_registers; |
| 271 | int lwp = regcache->ptid ().lwp (); |
| 272 | int ret = ptrace (PT_GETFPREGS, regcache->ptid ().pid (), |
| 273 | (PTRACE_TYPE_ARG3) &inferior_fp_registers, lwp); |
| 274 | struct vfpreg &vfp = inferior_fp_registers.fpr_vfp; |
| 275 | |
| 276 | if (ret < 0) |
| 277 | { |
| 278 | warning (_("unable to fetch floating-point registers")); |
| 279 | return; |
| 280 | } |
| 281 | |
| 282 | struct gdbarch_tdep *tdep = gdbarch_tdep (regcache->arch ()); |
| 283 | if (regno == ARM_FPSCR_REGNUM && tdep->vfp_register_count != 0) |
| 284 | regcache->raw_collect (ARM_FPSCR_REGNUM, (char *) &vfp.vfp_fpscr); |
| 285 | else if (regno >= ARM_D0_REGNUM |
| 286 | && regno <= ARM_D0_REGNUM + tdep->vfp_register_count) |
| 287 | { |
| 288 | regcache->raw_collect (regno, |
| 289 | (char *) &vfp.vfp_regs[regno - ARM_D0_REGNUM]); |
| 290 | } |
| 291 | else |
| 292 | warning (_("Invalid register number.")); |
| 293 | |
| 294 | ret = ptrace (PT_SETFPREGS, regcache->ptid ().pid (), |
| 295 | (PTRACE_TYPE_ARG3) &inferior_fp_registers, lwp); |
| 296 | |
| 297 | if (ret < 0) |
| 298 | warning (_("unable to write register %d to inferior"), regno); |
| 299 | } |
| 300 | |
| 301 | static void |
| 302 | store_fp_regs (const struct regcache *regcache) |
| 303 | { |
| 304 | struct gdbarch_tdep *tdep = gdbarch_tdep (regcache->arch ()); |
| 305 | int lwp = regcache->ptid ().lwp (); |
| 306 | if (tdep->vfp_register_count == 0) |
| 307 | return; |
| 308 | |
| 309 | struct fpreg fpregs; |
| 310 | for (int regno = 0; regno <= tdep->vfp_register_count; regno++) |
| 311 | regcache->raw_collect |
| 312 | (regno + ARM_D0_REGNUM, (char *) &fpregs.fpr_vfp.vfp_regs[regno]); |
| 313 | |
| 314 | regcache->raw_collect (ARM_FPSCR_REGNUM, |
| 315 | (char *) &fpregs.fpr_vfp.vfp_fpscr); |
| 316 | |
| 317 | int ret = ptrace (PT_SETFPREGS, regcache->ptid ().pid (), |
| 318 | (PTRACE_TYPE_ARG3) &fpregs, lwp); |
| 319 | |
| 320 | if (ret < 0) |
| 321 | warning (_("unable to store floating-point registers")); |
| 322 | } |
| 323 | |
| 324 | void |
| 325 | arm_netbsd_nat_target::store_registers (struct regcache *regcache, int regno) |
| 326 | { |
| 327 | if (regno >= 0) |
| 328 | { |
| 329 | if (regno < ARM_F0_REGNUM || regno > ARM_FPS_REGNUM) |
| 330 | store_register (regcache, regno); |
| 331 | else |
| 332 | store_fp_register (regcache, regno); |
| 333 | } |
| 334 | else |
| 335 | { |
| 336 | store_regs (regcache); |
| 337 | store_fp_regs (regcache); |
| 338 | } |
| 339 | } |
| 340 | |
| 341 | const struct target_desc * |
| 342 | arm_netbsd_nat_target::read_description () |
| 343 | { |
| 344 | int flag; |
| 345 | size_t len = sizeof (flag); |
| 346 | |
| 347 | if (sysctlbyname("machdep.fpu_present", &flag, &len, NULL, 0) != 0 |
| 348 | || !flag) |
| 349 | return arm_read_description (ARM_FP_TYPE_NONE); |
| 350 | |
| 351 | len = sizeof(flag); |
| 352 | if (sysctlbyname("machdep.neon_present", &flag, &len, NULL, 0) == 0 && flag) |
| 353 | return aarch32_read_description (); |
| 354 | |
| 355 | return arm_read_description (ARM_FP_TYPE_VFPV3); |
| 356 | } |
| 357 | |
| 358 | void _initialize_arm_netbsd_nat (); |
| 359 | void |
| 360 | _initialize_arm_netbsd_nat () |
| 361 | { |
| 362 | add_inf_child_target (&the_arm_netbsd_nat_target); |
| 363 | } |