| 1 | /* Low level interface to ptrace, for the remote server for GDB. |
| 2 | Copyright (C) 1995-2020 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GDB. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 3 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #include "server.h" |
| 20 | #include "linux-low.h" |
| 21 | |
| 22 | #include "nat/gdb_ptrace.h" |
| 23 | |
| 24 | #include "gdb_proc_service.h" |
| 25 | |
| 26 | /* The stack pointer is offset from the stack frame by a BIAS of 2047 |
| 27 | (0x7ff) for 64-bit code. BIAS is likely to be defined on SPARC |
| 28 | hosts, so undefine it first. */ |
| 29 | #undef BIAS |
| 30 | #define BIAS 2047 |
| 31 | |
| 32 | #ifdef HAVE_SYS_REG_H |
| 33 | #include <sys/reg.h> |
| 34 | #endif |
| 35 | |
| 36 | #define INSN_SIZE 4 |
| 37 | |
| 38 | #define SPARC_R_REGS_NUM 32 |
| 39 | #define SPARC_F_REGS_NUM 48 |
| 40 | #define SPARC_CONTROL_REGS_NUM 6 |
| 41 | |
| 42 | #define sparc_num_regs \ |
| 43 | (SPARC_R_REGS_NUM + SPARC_F_REGS_NUM + SPARC_CONTROL_REGS_NUM) |
| 44 | |
| 45 | /* Linux target op definitions for the SPARC architecture. */ |
| 46 | |
| 47 | class sparc_target : public linux_process_target |
| 48 | { |
| 49 | public: |
| 50 | |
| 51 | const regs_info *get_regs_info () override; |
| 52 | |
| 53 | const gdb_byte *sw_breakpoint_from_kind (int kind, int *size) override; |
| 54 | |
| 55 | protected: |
| 56 | |
| 57 | void low_arch_setup () override; |
| 58 | |
| 59 | bool low_cannot_fetch_register (int regno) override; |
| 60 | |
| 61 | bool low_cannot_store_register (int regno) override; |
| 62 | |
| 63 | bool low_supports_breakpoints () override; |
| 64 | |
| 65 | CORE_ADDR low_get_pc (regcache *regcache) override; |
| 66 | |
| 67 | /* No low_set_pc is needed. */ |
| 68 | |
| 69 | bool low_breakpoint_at (CORE_ADDR pc) override; |
| 70 | }; |
| 71 | |
| 72 | /* The singleton target ops object. */ |
| 73 | |
| 74 | static sparc_target the_sparc_target; |
| 75 | |
| 76 | bool |
| 77 | sparc_target::low_supports_breakpoints () |
| 78 | { |
| 79 | return true; |
| 80 | } |
| 81 | |
| 82 | CORE_ADDR |
| 83 | sparc_target::low_get_pc (regcache *regcache) |
| 84 | { |
| 85 | return linux_get_pc_64bit (regcache); |
| 86 | } |
| 87 | |
| 88 | /* Each offset is multiplied by 8, because of the register size. |
| 89 | These offsets apply to the buffer sent/filled by ptrace. |
| 90 | Additionally, the array elements order corresponds to the .dat file, and the |
| 91 | gdb's registers enumeration order. */ |
| 92 | |
| 93 | static int sparc_regmap[] = { |
| 94 | /* These offsets correspond to GET/SETREGSET. */ |
| 95 | -1, 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, /* g0 .. g7 */ |
| 96 | 7*8, 8*8, 9*8, 10*8, 11*8, 12*8, 13*8, 14*8, /* o0 .. o5, sp, o7 */ |
| 97 | -1, -1, -1, -1, -1, -1, -1, -1, /* l0 .. l7 */ |
| 98 | -1, -1, -1, -1, -1, -1, -1, -1, /* i0 .. i5, fp, i7 */ |
| 99 | |
| 100 | /* Floating point registers offsets correspond to GET/SETFPREGSET. */ |
| 101 | 0*4, 1*4, 2*4, 3*4, 4*4, 5*4, 6*4, 7*4, /* f0 .. f7 */ |
| 102 | 8*4, 9*4, 10*4, 11*4, 12*4, 13*4, 14*4, 15*4, /* f8 .. f15 */ |
| 103 | 16*4, 17*4, 18*4, 19*4, 20*4, 21*4, 22*4, 23*4, /* f16 .. f23 */ |
| 104 | 24*4, 25*4, 26*4, 27*4, 28*4, 29*4, 30*4, 31*4, /* f24 .. f31 */ |
| 105 | |
| 106 | /* F32 offset starts next to f31: 31*4+4 = 16 * 8. */ |
| 107 | 16*8, 17*8, 18*8, 19*8, 20*8, 21*8, 22*8, 23*8, /* f32 .. f46 */ |
| 108 | 24*8, 25*8, 26*8, 27*8, 28*8, 29*8, 30*8, 31*8, /* f48 .. f62 */ |
| 109 | |
| 110 | 17 *8, /* pc */ |
| 111 | 18 *8, /* npc */ |
| 112 | 16 *8, /* state */ |
| 113 | /* FSR offset also corresponds to GET/SETFPREGSET, ans is placed |
| 114 | next to f62. */ |
| 115 | 32 *8, /* fsr */ |
| 116 | -1, /* fprs */ |
| 117 | /* Y register is 32-bits length, but gdb takes care of that. */ |
| 118 | 19 *8, /* y */ |
| 119 | |
| 120 | }; |
| 121 | |
| 122 | |
| 123 | struct regs_range_t |
| 124 | { |
| 125 | int regno_start; |
| 126 | int regno_end; |
| 127 | }; |
| 128 | |
| 129 | static const struct regs_range_t gregs_ranges[] = { |
| 130 | { 0, 31 }, /* g0 .. i7 */ |
| 131 | { 80, 82 }, /* pc .. state */ |
| 132 | { 84, 85 } /* fprs .. y */ |
| 133 | }; |
| 134 | |
| 135 | #define N_GREGS_RANGES (sizeof (gregs_ranges) / sizeof (struct regs_range_t)) |
| 136 | |
| 137 | static const struct regs_range_t fpregs_ranges[] = { |
| 138 | { 32, 79 }, /* f0 .. f62 */ |
| 139 | { 83, 83 } /* fsr */ |
| 140 | }; |
| 141 | |
| 142 | #define N_FPREGS_RANGES (sizeof (fpregs_ranges) / sizeof (struct regs_range_t)) |
| 143 | |
| 144 | /* Defined in auto-generated file reg-sparc64.c. */ |
| 145 | void init_registers_sparc64 (void); |
| 146 | extern const struct target_desc *tdesc_sparc64; |
| 147 | |
| 148 | bool |
| 149 | sparc_target::low_cannot_store_register (int regno) |
| 150 | { |
| 151 | return (regno >= sparc_num_regs || sparc_regmap[regno] == -1); |
| 152 | } |
| 153 | |
| 154 | bool |
| 155 | sparc_target::low_cannot_fetch_register (int regno) |
| 156 | { |
| 157 | return (regno >= sparc_num_regs || sparc_regmap[regno] == -1); |
| 158 | } |
| 159 | |
| 160 | static void |
| 161 | sparc_fill_gregset_to_stack (struct regcache *regcache, const void *buf) |
| 162 | { |
| 163 | int i; |
| 164 | CORE_ADDR addr = 0; |
| 165 | unsigned char tmp_reg_buf[8]; |
| 166 | const int l0_regno = find_regno (regcache->tdesc, "l0"); |
| 167 | const int i7_regno = l0_regno + 15; |
| 168 | |
| 169 | /* These registers have to be stored in the stack. */ |
| 170 | memcpy (&addr, |
| 171 | ((char *) buf) + sparc_regmap[find_regno (regcache->tdesc, "sp")], |
| 172 | sizeof (addr)); |
| 173 | |
| 174 | addr += BIAS; |
| 175 | |
| 176 | for (i = l0_regno; i <= i7_regno; i++) |
| 177 | { |
| 178 | collect_register (regcache, i, tmp_reg_buf); |
| 179 | the_target->write_memory (addr, tmp_reg_buf, sizeof (tmp_reg_buf)); |
| 180 | addr += sizeof (tmp_reg_buf); |
| 181 | } |
| 182 | } |
| 183 | |
| 184 | static void |
| 185 | sparc_fill_gregset (struct regcache *regcache, void *buf) |
| 186 | { |
| 187 | int i; |
| 188 | int range; |
| 189 | |
| 190 | for (range = 0; range < N_GREGS_RANGES; range++) |
| 191 | for (i = gregs_ranges[range].regno_start; |
| 192 | i <= gregs_ranges[range].regno_end; i++) |
| 193 | if (sparc_regmap[i] != -1) |
| 194 | collect_register (regcache, i, ((char *) buf) + sparc_regmap[i]); |
| 195 | |
| 196 | sparc_fill_gregset_to_stack (regcache, buf); |
| 197 | } |
| 198 | |
| 199 | static void |
| 200 | sparc_fill_fpregset (struct regcache *regcache, void *buf) |
| 201 | { |
| 202 | int i; |
| 203 | int range; |
| 204 | |
| 205 | for (range = 0; range < N_FPREGS_RANGES; range++) |
| 206 | for (i = fpregs_ranges[range].regno_start; |
| 207 | i <= fpregs_ranges[range].regno_end; i++) |
| 208 | collect_register (regcache, i, ((char *) buf) + sparc_regmap[i]); |
| 209 | |
| 210 | } |
| 211 | |
| 212 | static void |
| 213 | sparc_store_gregset_from_stack (struct regcache *regcache, const void *buf) |
| 214 | { |
| 215 | int i; |
| 216 | CORE_ADDR addr = 0; |
| 217 | unsigned char tmp_reg_buf[8]; |
| 218 | const int l0_regno = find_regno (regcache->tdesc, "l0"); |
| 219 | const int i7_regno = l0_regno + 15; |
| 220 | |
| 221 | /* These registers have to be obtained from the stack. */ |
| 222 | memcpy (&addr, |
| 223 | ((char *) buf) + sparc_regmap[find_regno (regcache->tdesc, "sp")], |
| 224 | sizeof (addr)); |
| 225 | |
| 226 | addr += BIAS; |
| 227 | |
| 228 | for (i = l0_regno; i <= i7_regno; i++) |
| 229 | { |
| 230 | the_target->read_memory (addr, tmp_reg_buf, sizeof (tmp_reg_buf)); |
| 231 | supply_register (regcache, i, tmp_reg_buf); |
| 232 | addr += sizeof (tmp_reg_buf); |
| 233 | } |
| 234 | } |
| 235 | |
| 236 | static void |
| 237 | sparc_store_gregset (struct regcache *regcache, const void *buf) |
| 238 | { |
| 239 | int i; |
| 240 | char zerobuf[8]; |
| 241 | int range; |
| 242 | |
| 243 | memset (zerobuf, 0, sizeof (zerobuf)); |
| 244 | |
| 245 | for (range = 0; range < N_GREGS_RANGES; range++) |
| 246 | for (i = gregs_ranges[range].regno_start; |
| 247 | i <= gregs_ranges[range].regno_end; i++) |
| 248 | if (sparc_regmap[i] != -1) |
| 249 | supply_register (regcache, i, ((char *) buf) + sparc_regmap[i]); |
| 250 | else |
| 251 | supply_register (regcache, i, zerobuf); |
| 252 | |
| 253 | sparc_store_gregset_from_stack (regcache, buf); |
| 254 | } |
| 255 | |
| 256 | static void |
| 257 | sparc_store_fpregset (struct regcache *regcache, const void *buf) |
| 258 | { |
| 259 | int i; |
| 260 | int range; |
| 261 | |
| 262 | for (range = 0; range < N_FPREGS_RANGES; range++) |
| 263 | for (i = fpregs_ranges[range].regno_start; |
| 264 | i <= fpregs_ranges[range].regno_end; |
| 265 | i++) |
| 266 | supply_register (regcache, i, ((char *) buf) + sparc_regmap[i]); |
| 267 | } |
| 268 | |
| 269 | static const gdb_byte sparc_breakpoint[INSN_SIZE] = { |
| 270 | 0x91, 0xd0, 0x20, 0x01 |
| 271 | }; |
| 272 | #define sparc_breakpoint_len INSN_SIZE |
| 273 | |
| 274 | /* Implementation of target ops method "sw_breakpoint_from_kind". */ |
| 275 | |
| 276 | const gdb_byte * |
| 277 | sparc_target::sw_breakpoint_from_kind (int kind, int *size) |
| 278 | { |
| 279 | *size = sparc_breakpoint_len; |
| 280 | return sparc_breakpoint; |
| 281 | } |
| 282 | |
| 283 | bool |
| 284 | sparc_target::low_breakpoint_at (CORE_ADDR where) |
| 285 | { |
| 286 | unsigned char insn[INSN_SIZE]; |
| 287 | |
| 288 | read_memory (where, (unsigned char *) insn, sizeof (insn)); |
| 289 | |
| 290 | if (memcmp (sparc_breakpoint, insn, sizeof (insn)) == 0) |
| 291 | return true; |
| 292 | |
| 293 | /* If necessary, recognize more trap instructions here. GDB only |
| 294 | uses TRAP Always. */ |
| 295 | |
| 296 | return false; |
| 297 | } |
| 298 | |
| 299 | void |
| 300 | sparc_target::low_arch_setup () |
| 301 | { |
| 302 | current_process ()->tdesc = tdesc_sparc64; |
| 303 | } |
| 304 | |
| 305 | static struct regset_info sparc_regsets[] = { |
| 306 | { PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t), |
| 307 | GENERAL_REGS, |
| 308 | sparc_fill_gregset, sparc_store_gregset }, |
| 309 | { PTRACE_GETFPREGS, PTRACE_SETFPREGS, 0, sizeof (fpregset_t), |
| 310 | FP_REGS, |
| 311 | sparc_fill_fpregset, sparc_store_fpregset }, |
| 312 | NULL_REGSET |
| 313 | }; |
| 314 | |
| 315 | static struct regsets_info sparc_regsets_info = |
| 316 | { |
| 317 | sparc_regsets, /* regsets */ |
| 318 | 0, /* num_regsets */ |
| 319 | NULL, /* disabled_regsets */ |
| 320 | }; |
| 321 | |
| 322 | static struct usrregs_info sparc_usrregs_info = |
| 323 | { |
| 324 | sparc_num_regs, |
| 325 | /* No regmap needs to be provided since this impl. doesn't use |
| 326 | USRREGS. */ |
| 327 | NULL |
| 328 | }; |
| 329 | |
| 330 | static struct regs_info myregs_info = |
| 331 | { |
| 332 | NULL, /* regset_bitmap */ |
| 333 | &sparc_usrregs_info, |
| 334 | &sparc_regsets_info |
| 335 | }; |
| 336 | |
| 337 | const regs_info * |
| 338 | sparc_target::get_regs_info () |
| 339 | { |
| 340 | return &myregs_info; |
| 341 | } |
| 342 | |
| 343 | struct linux_target_ops the_low_target = { |
| 344 | NULL, NULL |
| 345 | }; |
| 346 | |
| 347 | /* The linux target ops object. */ |
| 348 | |
| 349 | linux_process_target *the_linux_target = &the_sparc_target; |
| 350 | |
| 351 | void |
| 352 | initialize_low_arch (void) |
| 353 | { |
| 354 | /* Initialize the Linux target descriptions. */ |
| 355 | init_registers_sparc64 (); |
| 356 | |
| 357 | initialize_regsets_info (&sparc_regsets_info); |
| 358 | } |