| 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 | /* Each offset is multiplied by 8, because of the register size. |
| 46 | These offsets apply to the buffer sent/filled by ptrace. |
| 47 | Additionally, the array elements order corresponds to the .dat file, and the |
| 48 | gdb's registers enumeration order. */ |
| 49 | |
| 50 | static int sparc_regmap[] = { |
| 51 | /* These offsets correspond to GET/SETREGSET. */ |
| 52 | -1, 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, /* g0 .. g7 */ |
| 53 | 7*8, 8*8, 9*8, 10*8, 11*8, 12*8, 13*8, 14*8, /* o0 .. o5, sp, o7 */ |
| 54 | -1, -1, -1, -1, -1, -1, -1, -1, /* l0 .. l7 */ |
| 55 | -1, -1, -1, -1, -1, -1, -1, -1, /* i0 .. i5, fp, i7 */ |
| 56 | |
| 57 | /* Floating point registers offsets correspond to GET/SETFPREGSET. */ |
| 58 | 0*4, 1*4, 2*4, 3*4, 4*4, 5*4, 6*4, 7*4, /* f0 .. f7 */ |
| 59 | 8*4, 9*4, 10*4, 11*4, 12*4, 13*4, 14*4, 15*4, /* f8 .. f15 */ |
| 60 | 16*4, 17*4, 18*4, 19*4, 20*4, 21*4, 22*4, 23*4, /* f16 .. f23 */ |
| 61 | 24*4, 25*4, 26*4, 27*4, 28*4, 29*4, 30*4, 31*4, /* f24 .. f31 */ |
| 62 | |
| 63 | /* F32 offset starts next to f31: 31*4+4 = 16 * 8. */ |
| 64 | 16*8, 17*8, 18*8, 19*8, 20*8, 21*8, 22*8, 23*8, /* f32 .. f46 */ |
| 65 | 24*8, 25*8, 26*8, 27*8, 28*8, 29*8, 30*8, 31*8, /* f48 .. f62 */ |
| 66 | |
| 67 | 17 *8, /* pc */ |
| 68 | 18 *8, /* npc */ |
| 69 | 16 *8, /* state */ |
| 70 | /* FSR offset also corresponds to GET/SETFPREGSET, ans is placed |
| 71 | next to f62. */ |
| 72 | 32 *8, /* fsr */ |
| 73 | -1, /* fprs */ |
| 74 | /* Y register is 32-bits length, but gdb takes care of that. */ |
| 75 | 19 *8, /* y */ |
| 76 | |
| 77 | }; |
| 78 | |
| 79 | |
| 80 | struct regs_range_t |
| 81 | { |
| 82 | int regno_start; |
| 83 | int regno_end; |
| 84 | }; |
| 85 | |
| 86 | static const struct regs_range_t gregs_ranges[] = { |
| 87 | { 0, 31 }, /* g0 .. i7 */ |
| 88 | { 80, 82 }, /* pc .. state */ |
| 89 | { 84, 85 } /* fprs .. y */ |
| 90 | }; |
| 91 | |
| 92 | #define N_GREGS_RANGES (sizeof (gregs_ranges) / sizeof (struct regs_range_t)) |
| 93 | |
| 94 | static const struct regs_range_t fpregs_ranges[] = { |
| 95 | { 32, 79 }, /* f0 .. f62 */ |
| 96 | { 83, 83 } /* fsr */ |
| 97 | }; |
| 98 | |
| 99 | #define N_FPREGS_RANGES (sizeof (fpregs_ranges) / sizeof (struct regs_range_t)) |
| 100 | |
| 101 | /* Defined in auto-generated file reg-sparc64.c. */ |
| 102 | void init_registers_sparc64 (void); |
| 103 | extern const struct target_desc *tdesc_sparc64; |
| 104 | |
| 105 | static int |
| 106 | sparc_cannot_store_register (int regno) |
| 107 | { |
| 108 | return (regno >= sparc_num_regs || sparc_regmap[regno] == -1); |
| 109 | } |
| 110 | |
| 111 | static int |
| 112 | sparc_cannot_fetch_register (int regno) |
| 113 | { |
| 114 | return (regno >= sparc_num_regs || sparc_regmap[regno] == -1); |
| 115 | } |
| 116 | |
| 117 | static void |
| 118 | sparc_fill_gregset_to_stack (struct regcache *regcache, const void *buf) |
| 119 | { |
| 120 | int i; |
| 121 | CORE_ADDR addr = 0; |
| 122 | unsigned char tmp_reg_buf[8]; |
| 123 | const int l0_regno = find_regno (regcache->tdesc, "l0"); |
| 124 | const int i7_regno = l0_regno + 15; |
| 125 | |
| 126 | /* These registers have to be stored in the stack. */ |
| 127 | memcpy (&addr, |
| 128 | ((char *) buf) + sparc_regmap[find_regno (regcache->tdesc, "sp")], |
| 129 | sizeof (addr)); |
| 130 | |
| 131 | addr += BIAS; |
| 132 | |
| 133 | for (i = l0_regno; i <= i7_regno; i++) |
| 134 | { |
| 135 | collect_register (regcache, i, tmp_reg_buf); |
| 136 | the_target->write_memory (addr, tmp_reg_buf, sizeof (tmp_reg_buf)); |
| 137 | addr += sizeof (tmp_reg_buf); |
| 138 | } |
| 139 | } |
| 140 | |
| 141 | static void |
| 142 | sparc_fill_gregset (struct regcache *regcache, void *buf) |
| 143 | { |
| 144 | int i; |
| 145 | int range; |
| 146 | |
| 147 | for (range = 0; range < N_GREGS_RANGES; range++) |
| 148 | for (i = gregs_ranges[range].regno_start; |
| 149 | i <= gregs_ranges[range].regno_end; i++) |
| 150 | if (sparc_regmap[i] != -1) |
| 151 | collect_register (regcache, i, ((char *) buf) + sparc_regmap[i]); |
| 152 | |
| 153 | sparc_fill_gregset_to_stack (regcache, buf); |
| 154 | } |
| 155 | |
| 156 | static void |
| 157 | sparc_fill_fpregset (struct regcache *regcache, void *buf) |
| 158 | { |
| 159 | int i; |
| 160 | int range; |
| 161 | |
| 162 | for (range = 0; range < N_FPREGS_RANGES; range++) |
| 163 | for (i = fpregs_ranges[range].regno_start; |
| 164 | i <= fpregs_ranges[range].regno_end; i++) |
| 165 | collect_register (regcache, i, ((char *) buf) + sparc_regmap[i]); |
| 166 | |
| 167 | } |
| 168 | |
| 169 | static void |
| 170 | sparc_store_gregset_from_stack (struct regcache *regcache, const void *buf) |
| 171 | { |
| 172 | int i; |
| 173 | CORE_ADDR addr = 0; |
| 174 | unsigned char tmp_reg_buf[8]; |
| 175 | const int l0_regno = find_regno (regcache->tdesc, "l0"); |
| 176 | const int i7_regno = l0_regno + 15; |
| 177 | |
| 178 | /* These registers have to be obtained from the stack. */ |
| 179 | memcpy (&addr, |
| 180 | ((char *) buf) + sparc_regmap[find_regno (regcache->tdesc, "sp")], |
| 181 | sizeof (addr)); |
| 182 | |
| 183 | addr += BIAS; |
| 184 | |
| 185 | for (i = l0_regno; i <= i7_regno; i++) |
| 186 | { |
| 187 | the_target->read_memory (addr, tmp_reg_buf, sizeof (tmp_reg_buf)); |
| 188 | supply_register (regcache, i, tmp_reg_buf); |
| 189 | addr += sizeof (tmp_reg_buf); |
| 190 | } |
| 191 | } |
| 192 | |
| 193 | static void |
| 194 | sparc_store_gregset (struct regcache *regcache, const void *buf) |
| 195 | { |
| 196 | int i; |
| 197 | char zerobuf[8]; |
| 198 | int range; |
| 199 | |
| 200 | memset (zerobuf, 0, sizeof (zerobuf)); |
| 201 | |
| 202 | for (range = 0; range < N_GREGS_RANGES; range++) |
| 203 | for (i = gregs_ranges[range].regno_start; |
| 204 | i <= gregs_ranges[range].regno_end; i++) |
| 205 | if (sparc_regmap[i] != -1) |
| 206 | supply_register (regcache, i, ((char *) buf) + sparc_regmap[i]); |
| 207 | else |
| 208 | supply_register (regcache, i, zerobuf); |
| 209 | |
| 210 | sparc_store_gregset_from_stack (regcache, buf); |
| 211 | } |
| 212 | |
| 213 | static void |
| 214 | sparc_store_fpregset (struct regcache *regcache, const void *buf) |
| 215 | { |
| 216 | int i; |
| 217 | int range; |
| 218 | |
| 219 | for (range = 0; range < N_FPREGS_RANGES; range++) |
| 220 | for (i = fpregs_ranges[range].regno_start; |
| 221 | i <= fpregs_ranges[range].regno_end; |
| 222 | i++) |
| 223 | supply_register (regcache, i, ((char *) buf) + sparc_regmap[i]); |
| 224 | } |
| 225 | |
| 226 | static const gdb_byte sparc_breakpoint[INSN_SIZE] = { |
| 227 | 0x91, 0xd0, 0x20, 0x01 |
| 228 | }; |
| 229 | #define sparc_breakpoint_len INSN_SIZE |
| 230 | |
| 231 | /* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */ |
| 232 | |
| 233 | static const unsigned char * |
| 234 | sparc_sw_breakpoint_from_kind (int kind, int *size) |
| 235 | { |
| 236 | *size = sparc_breakpoint_len; |
| 237 | return sparc_breakpoint; |
| 238 | } |
| 239 | |
| 240 | static int |
| 241 | sparc_breakpoint_at (CORE_ADDR where) |
| 242 | { |
| 243 | unsigned char insn[INSN_SIZE]; |
| 244 | |
| 245 | the_target->read_memory (where, (unsigned char *) insn, sizeof (insn)); |
| 246 | |
| 247 | if (memcmp (sparc_breakpoint, insn, sizeof (insn)) == 0) |
| 248 | return 1; |
| 249 | |
| 250 | /* If necessary, recognize more trap instructions here. GDB only |
| 251 | uses TRAP Always. */ |
| 252 | |
| 253 | return 0; |
| 254 | } |
| 255 | |
| 256 | static void |
| 257 | sparc_arch_setup (void) |
| 258 | { |
| 259 | current_process ()->tdesc = tdesc_sparc64; |
| 260 | } |
| 261 | |
| 262 | static struct regset_info sparc_regsets[] = { |
| 263 | { PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t), |
| 264 | GENERAL_REGS, |
| 265 | sparc_fill_gregset, sparc_store_gregset }, |
| 266 | { PTRACE_GETFPREGS, PTRACE_SETFPREGS, 0, sizeof (fpregset_t), |
| 267 | FP_REGS, |
| 268 | sparc_fill_fpregset, sparc_store_fpregset }, |
| 269 | NULL_REGSET |
| 270 | }; |
| 271 | |
| 272 | static struct regsets_info sparc_regsets_info = |
| 273 | { |
| 274 | sparc_regsets, /* regsets */ |
| 275 | 0, /* num_regsets */ |
| 276 | NULL, /* disabled_regsets */ |
| 277 | }; |
| 278 | |
| 279 | static struct usrregs_info sparc_usrregs_info = |
| 280 | { |
| 281 | sparc_num_regs, |
| 282 | /* No regmap needs to be provided since this impl. doesn't use |
| 283 | USRREGS. */ |
| 284 | NULL |
| 285 | }; |
| 286 | |
| 287 | static struct regs_info regs_info = |
| 288 | { |
| 289 | NULL, /* regset_bitmap */ |
| 290 | &sparc_usrregs_info, |
| 291 | &sparc_regsets_info |
| 292 | }; |
| 293 | |
| 294 | static const struct regs_info * |
| 295 | sparc_regs_info (void) |
| 296 | { |
| 297 | return ®s_info; |
| 298 | } |
| 299 | |
| 300 | struct linux_target_ops the_low_target = { |
| 301 | sparc_arch_setup, |
| 302 | sparc_regs_info, |
| 303 | sparc_cannot_fetch_register, |
| 304 | sparc_cannot_store_register, |
| 305 | NULL, /* fetch_register */ |
| 306 | linux_get_pc_64bit, |
| 307 | /* No sparc_set_pc is needed. */ |
| 308 | NULL, |
| 309 | NULL, /* breakpoint_kind_from_pc */ |
| 310 | sparc_sw_breakpoint_from_kind, |
| 311 | NULL, /* get_next_pcs */ |
| 312 | 0, |
| 313 | sparc_breakpoint_at, |
| 314 | NULL, /* supports_z_point_type */ |
| 315 | NULL, NULL, NULL, NULL, |
| 316 | NULL, NULL |
| 317 | }; |
| 318 | |
| 319 | void |
| 320 | initialize_low_arch (void) |
| 321 | { |
| 322 | /* Initialize the Linux target descriptions. */ |
| 323 | init_registers_sparc64 (); |
| 324 | |
| 325 | initialize_regsets_info (&sparc_regsets_info); |
| 326 | } |