| 1 | /* Ravenscar PowerPC target support. |
| 2 | |
| 3 | Copyright (C) 2011-2015 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 "gdbcore.h" |
| 22 | #include "regcache.h" |
| 23 | #include "ppc-tdep.h" |
| 24 | #include "inferior.h" |
| 25 | #include "ravenscar-thread.h" |
| 26 | #include "ppc-ravenscar-thread.h" |
| 27 | |
| 28 | #define NO_OFFSET -1 |
| 29 | |
| 30 | /* See ppc-tdep.h for register numbers. */ |
| 31 | |
| 32 | static const int powerpc_context_offsets[] = |
| 33 | { |
| 34 | /* R0 - R32 */ |
| 35 | NO_OFFSET, 0, 4, NO_OFFSET, |
| 36 | NO_OFFSET, NO_OFFSET, NO_OFFSET, NO_OFFSET, |
| 37 | NO_OFFSET, NO_OFFSET, NO_OFFSET, NO_OFFSET, |
| 38 | NO_OFFSET, 8, 12, 16, |
| 39 | 20, 24, 28, 32, |
| 40 | 36, 40, 44, 48, |
| 41 | 52, 56, 60, 64, |
| 42 | 68, 72, 76, 80, |
| 43 | |
| 44 | /* F0 - F31 */ |
| 45 | NO_OFFSET, NO_OFFSET, NO_OFFSET, NO_OFFSET, |
| 46 | NO_OFFSET, NO_OFFSET, NO_OFFSET, NO_OFFSET, |
| 47 | NO_OFFSET, NO_OFFSET, NO_OFFSET, NO_OFFSET, |
| 48 | NO_OFFSET, NO_OFFSET, 96, 104, |
| 49 | 112, 120, 128, 136, |
| 50 | 144, 152, 160, 168, |
| 51 | 176, 184, 192, 200, |
| 52 | 208, 216, 224, 232, |
| 53 | |
| 54 | /* PC, MSR, CR, LR */ |
| 55 | 88, NO_OFFSET, 84, NO_OFFSET, |
| 56 | |
| 57 | /* CTR, XER, FPSCR */ |
| 58 | NO_OFFSET, NO_OFFSET, 240 |
| 59 | }; |
| 60 | |
| 61 | static const int e500_context_offsets[] = |
| 62 | { |
| 63 | /* R0 - R32 */ |
| 64 | NO_OFFSET, 4, 12, NO_OFFSET, |
| 65 | NO_OFFSET, NO_OFFSET, NO_OFFSET, NO_OFFSET, |
| 66 | NO_OFFSET, NO_OFFSET, NO_OFFSET, NO_OFFSET, |
| 67 | NO_OFFSET, 20, 28, 36, |
| 68 | 44, 52, 60, 68, |
| 69 | 76, 84, 92, 100, |
| 70 | 108, 116, 124, 132, |
| 71 | 140, 148, 156, 164, |
| 72 | |
| 73 | /* F0 - F31 */ |
| 74 | NO_OFFSET, NO_OFFSET, NO_OFFSET, NO_OFFSET, |
| 75 | NO_OFFSET, NO_OFFSET, NO_OFFSET, NO_OFFSET, |
| 76 | NO_OFFSET, NO_OFFSET, NO_OFFSET, NO_OFFSET, |
| 77 | NO_OFFSET, NO_OFFSET, NO_OFFSET, NO_OFFSET, |
| 78 | NO_OFFSET, NO_OFFSET, NO_OFFSET, NO_OFFSET, |
| 79 | NO_OFFSET, NO_OFFSET, NO_OFFSET, NO_OFFSET, |
| 80 | NO_OFFSET, NO_OFFSET, NO_OFFSET, NO_OFFSET, |
| 81 | NO_OFFSET, NO_OFFSET, NO_OFFSET, NO_OFFSET, |
| 82 | |
| 83 | /* PC, MSR, CR, LR */ |
| 84 | 172, NO_OFFSET, 168, NO_OFFSET, |
| 85 | |
| 86 | /* CTR, XER, FPSCR, MQ */ |
| 87 | NO_OFFSET, NO_OFFSET, NO_OFFSET, NO_OFFSET, |
| 88 | |
| 89 | /* Upper R0-R32. */ |
| 90 | NO_OFFSET, 0, 8, NO_OFFSET, |
| 91 | NO_OFFSET, NO_OFFSET, NO_OFFSET, NO_OFFSET, |
| 92 | NO_OFFSET, NO_OFFSET, NO_OFFSET, NO_OFFSET, |
| 93 | NO_OFFSET, 16, 24, 32, |
| 94 | 40, 48, 56, 64, |
| 95 | 72, 80, 88, 96, |
| 96 | 104, 112, 120, 128, |
| 97 | 136, 144, 152, 160, |
| 98 | |
| 99 | /* ACC, FSCR */ |
| 100 | NO_OFFSET, 176 |
| 101 | }; |
| 102 | |
| 103 | /* The register layout info. */ |
| 104 | |
| 105 | struct ravenscar_reg_info |
| 106 | { |
| 107 | /* A table providing the offset relative to the context structure |
| 108 | where each register is saved. */ |
| 109 | const int *context_offsets; |
| 110 | |
| 111 | /* The number of elements in the context_offsets table above. */ |
| 112 | int context_offsets_size; |
| 113 | }; |
| 114 | |
| 115 | /* supply register REGNUM, which has been saved on REGISTER_ADDR, to the |
| 116 | regcache. */ |
| 117 | |
| 118 | static void |
| 119 | supply_register_at_address (struct regcache *regcache, int regnum, |
| 120 | CORE_ADDR register_addr) |
| 121 | { |
| 122 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 123 | int buf_size = register_size (gdbarch, regnum); |
| 124 | gdb_byte *buf; |
| 125 | |
| 126 | buf = (gdb_byte *) alloca (buf_size); |
| 127 | read_memory (register_addr, buf, buf_size); |
| 128 | regcache_raw_supply (regcache, regnum, buf); |
| 129 | } |
| 130 | |
| 131 | /* Return true if, for a non-running thread, REGNUM has been saved on the |
| 132 | Thread_Descriptor. */ |
| 133 | |
| 134 | static int |
| 135 | register_in_thread_descriptor_p (const struct ravenscar_reg_info *reg_info, |
| 136 | int regnum) |
| 137 | { |
| 138 | return (regnum < reg_info->context_offsets_size |
| 139 | && reg_info->context_offsets[regnum] != NO_OFFSET); |
| 140 | } |
| 141 | |
| 142 | /* to_fetch_registers when inferior_ptid is different from the running |
| 143 | thread. */ |
| 144 | |
| 145 | static void |
| 146 | ppc_ravenscar_generic_fetch_registers |
| 147 | (const struct ravenscar_reg_info *reg_info, |
| 148 | struct regcache *regcache, int regnum) |
| 149 | { |
| 150 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 151 | const int sp_regnum = gdbarch_sp_regnum (gdbarch); |
| 152 | const int num_regs = gdbarch_num_regs (gdbarch); |
| 153 | int current_regnum; |
| 154 | CORE_ADDR current_address; |
| 155 | CORE_ADDR thread_descriptor_address; |
| 156 | |
| 157 | /* The tid is the thread_id field, which is a pointer to the thread. */ |
| 158 | thread_descriptor_address = (CORE_ADDR) ptid_get_tid (inferior_ptid); |
| 159 | |
| 160 | /* Read registers. */ |
| 161 | for (current_regnum = 0; current_regnum < num_regs; current_regnum++) |
| 162 | { |
| 163 | if (register_in_thread_descriptor_p (reg_info, current_regnum)) |
| 164 | { |
| 165 | current_address = thread_descriptor_address |
| 166 | + reg_info->context_offsets[current_regnum]; |
| 167 | supply_register_at_address (regcache, current_regnum, |
| 168 | current_address); |
| 169 | } |
| 170 | } |
| 171 | } |
| 172 | |
| 173 | /* to_prepare_to_store when inferior_ptid is different from the running |
| 174 | thread. */ |
| 175 | |
| 176 | static void |
| 177 | ppc_ravenscar_generic_prepare_to_store (struct regcache *regcache) |
| 178 | { |
| 179 | /* Nothing to do. */ |
| 180 | } |
| 181 | |
| 182 | /* to_store_registers when inferior_ptid is different from the running |
| 183 | thread. */ |
| 184 | |
| 185 | static void |
| 186 | ppc_ravenscar_generic_store_registers |
| 187 | (const struct ravenscar_reg_info *reg_info, |
| 188 | struct regcache *regcache, int regnum) |
| 189 | { |
| 190 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 191 | int buf_size = register_size (gdbarch, regnum); |
| 192 | gdb_byte buf[buf_size]; |
| 193 | ULONGEST register_address; |
| 194 | |
| 195 | if (register_in_thread_descriptor_p (reg_info, regnum)) |
| 196 | register_address |
| 197 | = ptid_get_tid (inferior_ptid) + reg_info->context_offsets [regnum]; |
| 198 | else |
| 199 | return; |
| 200 | |
| 201 | regcache_raw_collect (regcache, regnum, buf); |
| 202 | write_memory (register_address, |
| 203 | buf, |
| 204 | buf_size); |
| 205 | } |
| 206 | |
| 207 | /* The ravenscar_reg_info for most PowerPC targets. */ |
| 208 | |
| 209 | static const struct ravenscar_reg_info ppc_reg_info = |
| 210 | { |
| 211 | powerpc_context_offsets, |
| 212 | ARRAY_SIZE (powerpc_context_offsets), |
| 213 | }; |
| 214 | |
| 215 | /* Implement the to_fetch_registers ravenscar_arch_ops method |
| 216 | for most PowerPC targets. */ |
| 217 | |
| 218 | static void |
| 219 | ppc_ravenscar_powerpc_fetch_registers (struct regcache *regcache, int regnum) |
| 220 | { |
| 221 | ppc_ravenscar_generic_fetch_registers (&ppc_reg_info, regcache, regnum); |
| 222 | } |
| 223 | |
| 224 | /* Implement the to_store_registers ravenscar_arch_ops method |
| 225 | for most PowerPC targets. */ |
| 226 | |
| 227 | static void |
| 228 | ppc_ravenscar_powerpc_store_registers (struct regcache *regcache, int regnum) |
| 229 | { |
| 230 | ppc_ravenscar_generic_store_registers (&ppc_reg_info, regcache, regnum); |
| 231 | } |
| 232 | |
| 233 | /* The ravenscar_arch_ops vector for most PowerPC targets. */ |
| 234 | |
| 235 | static struct ravenscar_arch_ops ppc_ravenscar_powerpc_ops = |
| 236 | { |
| 237 | ppc_ravenscar_powerpc_fetch_registers, |
| 238 | ppc_ravenscar_powerpc_store_registers, |
| 239 | ppc_ravenscar_generic_prepare_to_store |
| 240 | }; |
| 241 | |
| 242 | /* Register ppc_ravenscar_powerpc_ops in GDBARCH. */ |
| 243 | |
| 244 | void |
| 245 | register_ppc_ravenscar_ops (struct gdbarch *gdbarch) |
| 246 | { |
| 247 | set_gdbarch_ravenscar_ops (gdbarch, &ppc_ravenscar_powerpc_ops); |
| 248 | } |
| 249 | |
| 250 | /* The ravenscar_reg_info for E500 targets. */ |
| 251 | |
| 252 | static const struct ravenscar_reg_info e500_reg_info = |
| 253 | { |
| 254 | e500_context_offsets, |
| 255 | ARRAY_SIZE (e500_context_offsets), |
| 256 | }; |
| 257 | |
| 258 | /* Implement the to_fetch_registers ravenscar_arch_ops method |
| 259 | for E500 targets. */ |
| 260 | |
| 261 | static void |
| 262 | ppc_ravenscar_e500_fetch_registers (struct regcache *regcache, int regnum) |
| 263 | { |
| 264 | ppc_ravenscar_generic_fetch_registers (&e500_reg_info, regcache, regnum); |
| 265 | } |
| 266 | |
| 267 | /* Implement the to_store_registers ravenscar_arch_ops method |
| 268 | for E500 targets. */ |
| 269 | |
| 270 | static void |
| 271 | ppc_ravenscar_e500_store_registers (struct regcache *regcache, int regnum) |
| 272 | { |
| 273 | ppc_ravenscar_generic_store_registers (&e500_reg_info, regcache, regnum); |
| 274 | } |
| 275 | |
| 276 | /* The ravenscar_arch_ops vector for E500 targets. */ |
| 277 | |
| 278 | static struct ravenscar_arch_ops ppc_ravenscar_e500_ops = |
| 279 | { |
| 280 | ppc_ravenscar_e500_fetch_registers, |
| 281 | ppc_ravenscar_e500_store_registers, |
| 282 | ppc_ravenscar_generic_prepare_to_store |
| 283 | }; |
| 284 | |
| 285 | /* Register ppc_ravenscar_e500_ops in GDBARCH. */ |
| 286 | |
| 287 | void |
| 288 | register_e500_ravenscar_ops (struct gdbarch *gdbarch) |
| 289 | { |
| 290 | set_gdbarch_ravenscar_ops (gdbarch, &ppc_ravenscar_e500_ops); |
| 291 | } |