| 1 | /* GNU/Linux S/390 specific low level interface, for the remote server |
| 2 | for GDB. |
| 3 | Copyright (C) 2001, 2002, 2005, 2006, 2007, 2008, 2009, 2010, 2011 |
| 4 | Free Software Foundation, Inc. |
| 5 | |
| 6 | This file is part of GDB. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 3 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 20 | |
| 21 | /* This file is used for both 31-bit and 64-bit S/390 systems. */ |
| 22 | |
| 23 | #include "server.h" |
| 24 | #include "linux-low.h" |
| 25 | #include "elf/common.h" |
| 26 | |
| 27 | #include <asm/ptrace.h> |
| 28 | #include <sys/ptrace.h> |
| 29 | #include <sys/uio.h> |
| 30 | #include <elf.h> |
| 31 | |
| 32 | #ifndef HWCAP_S390_HIGH_GPRS |
| 33 | #define HWCAP_S390_HIGH_GPRS 512 |
| 34 | #endif |
| 35 | |
| 36 | #ifndef PTRACE_GETREGSET |
| 37 | #define PTRACE_GETREGSET 0x4204 |
| 38 | #endif |
| 39 | |
| 40 | #ifndef PTRACE_SETREGSET |
| 41 | #define PTRACE_SETREGSET 0x4205 |
| 42 | #endif |
| 43 | |
| 44 | /* Defined in auto-generated file s390-linux32.c. */ |
| 45 | void init_registers_s390_linux32 (void); |
| 46 | /* Defined in auto-generated file s390-linux32v1.c. */ |
| 47 | void init_registers_s390_linux32v1 (void); |
| 48 | /* Defined in auto-generated file s390-linux32v2.c. */ |
| 49 | void init_registers_s390_linux32v2 (void); |
| 50 | /* Defined in auto-generated file s390-linux64.c. */ |
| 51 | void init_registers_s390_linux64 (void); |
| 52 | /* Defined in auto-generated file s390-linux64v1.c. */ |
| 53 | void init_registers_s390_linux64v1 (void); |
| 54 | /* Defined in auto-generated file s390-linux64v2.c. */ |
| 55 | void init_registers_s390_linux64v2 (void); |
| 56 | /* Defined in auto-generated file s390x-linux64.c. */ |
| 57 | void init_registers_s390x_linux64 (void); |
| 58 | /* Defined in auto-generated file s390x-linux64v1.c. */ |
| 59 | void init_registers_s390x_linux64v1 (void); |
| 60 | /* Defined in auto-generated file s390x-linux64v2.c. */ |
| 61 | void init_registers_s390x_linux64v2 (void); |
| 62 | |
| 63 | #define s390_num_regs 52 |
| 64 | |
| 65 | static int s390_regmap[] = { |
| 66 | PT_PSWMASK, PT_PSWADDR, |
| 67 | |
| 68 | PT_GPR0, PT_GPR1, PT_GPR2, PT_GPR3, |
| 69 | PT_GPR4, PT_GPR5, PT_GPR6, PT_GPR7, |
| 70 | PT_GPR8, PT_GPR9, PT_GPR10, PT_GPR11, |
| 71 | PT_GPR12, PT_GPR13, PT_GPR14, PT_GPR15, |
| 72 | |
| 73 | PT_ACR0, PT_ACR1, PT_ACR2, PT_ACR3, |
| 74 | PT_ACR4, PT_ACR5, PT_ACR6, PT_ACR7, |
| 75 | PT_ACR8, PT_ACR9, PT_ACR10, PT_ACR11, |
| 76 | PT_ACR12, PT_ACR13, PT_ACR14, PT_ACR15, |
| 77 | |
| 78 | PT_FPC, |
| 79 | |
| 80 | #ifndef __s390x__ |
| 81 | PT_FPR0_HI, PT_FPR1_HI, PT_FPR2_HI, PT_FPR3_HI, |
| 82 | PT_FPR4_HI, PT_FPR5_HI, PT_FPR6_HI, PT_FPR7_HI, |
| 83 | PT_FPR8_HI, PT_FPR9_HI, PT_FPR10_HI, PT_FPR11_HI, |
| 84 | PT_FPR12_HI, PT_FPR13_HI, PT_FPR14_HI, PT_FPR15_HI, |
| 85 | #else |
| 86 | PT_FPR0, PT_FPR1, PT_FPR2, PT_FPR3, |
| 87 | PT_FPR4, PT_FPR5, PT_FPR6, PT_FPR7, |
| 88 | PT_FPR8, PT_FPR9, PT_FPR10, PT_FPR11, |
| 89 | PT_FPR12, PT_FPR13, PT_FPR14, PT_FPR15, |
| 90 | #endif |
| 91 | |
| 92 | PT_ORIGGPR2, |
| 93 | }; |
| 94 | |
| 95 | #ifdef __s390x__ |
| 96 | #define s390_num_regs_3264 68 |
| 97 | |
| 98 | static int s390_regmap_3264[] = { |
| 99 | PT_PSWMASK, PT_PSWADDR, |
| 100 | |
| 101 | PT_GPR0, PT_GPR0, PT_GPR1, PT_GPR1, |
| 102 | PT_GPR2, PT_GPR2, PT_GPR3, PT_GPR3, |
| 103 | PT_GPR4, PT_GPR4, PT_GPR5, PT_GPR5, |
| 104 | PT_GPR6, PT_GPR6, PT_GPR7, PT_GPR7, |
| 105 | PT_GPR8, PT_GPR8, PT_GPR9, PT_GPR9, |
| 106 | PT_GPR10, PT_GPR10, PT_GPR11, PT_GPR11, |
| 107 | PT_GPR12, PT_GPR12, PT_GPR13, PT_GPR13, |
| 108 | PT_GPR14, PT_GPR14, PT_GPR15, PT_GPR15, |
| 109 | |
| 110 | PT_ACR0, PT_ACR1, PT_ACR2, PT_ACR3, |
| 111 | PT_ACR4, PT_ACR5, PT_ACR6, PT_ACR7, |
| 112 | PT_ACR8, PT_ACR9, PT_ACR10, PT_ACR11, |
| 113 | PT_ACR12, PT_ACR13, PT_ACR14, PT_ACR15, |
| 114 | |
| 115 | PT_FPC, |
| 116 | |
| 117 | PT_FPR0, PT_FPR1, PT_FPR2, PT_FPR3, |
| 118 | PT_FPR4, PT_FPR5, PT_FPR6, PT_FPR7, |
| 119 | PT_FPR8, PT_FPR9, PT_FPR10, PT_FPR11, |
| 120 | PT_FPR12, PT_FPR13, PT_FPR14, PT_FPR15, |
| 121 | |
| 122 | PT_ORIGGPR2, |
| 123 | }; |
| 124 | #endif |
| 125 | |
| 126 | |
| 127 | static int |
| 128 | s390_cannot_fetch_register (int regno) |
| 129 | { |
| 130 | return 0; |
| 131 | } |
| 132 | |
| 133 | static int |
| 134 | s390_cannot_store_register (int regno) |
| 135 | { |
| 136 | return 0; |
| 137 | } |
| 138 | |
| 139 | static void |
| 140 | s390_collect_ptrace_register (struct regcache *regcache, int regno, char *buf) |
| 141 | { |
| 142 | int size = register_size (regno); |
| 143 | if (size < sizeof (long)) |
| 144 | { |
| 145 | int regaddr = the_low_target.regmap[regno]; |
| 146 | |
| 147 | memset (buf, 0, sizeof (long)); |
| 148 | |
| 149 | if ((regno ^ 1) < the_low_target.num_regs |
| 150 | && the_low_target.regmap[regno ^ 1] == regaddr) |
| 151 | { |
| 152 | collect_register (regcache, regno & ~1, buf); |
| 153 | collect_register (regcache, (regno & ~1) + 1, |
| 154 | buf + sizeof (long) - size); |
| 155 | } |
| 156 | else if (regaddr == PT_PSWMASK) |
| 157 | { |
| 158 | /* Convert 4-byte PSW mask to 8 bytes by clearing bit 12 and copying |
| 159 | the basic addressing mode bit from the PSW address. */ |
| 160 | char *addr = alloca (register_size (regno ^ 1)); |
| 161 | collect_register (regcache, regno, buf); |
| 162 | collect_register (regcache, regno ^ 1, addr); |
| 163 | buf[1] &= ~0x8; |
| 164 | buf[size] |= (addr[0] & 0x80); |
| 165 | } |
| 166 | else if (regaddr == PT_PSWADDR) |
| 167 | { |
| 168 | /* Convert 4-byte PSW address to 8 bytes by clearing the addressing |
| 169 | mode bit (which gets copied to the PSW mask instead). */ |
| 170 | collect_register (regcache, regno, buf + sizeof (long) - size); |
| 171 | buf[sizeof (long) - size] &= ~0x80; |
| 172 | } |
| 173 | else if ((regaddr >= PT_GPR0 && regaddr <= PT_GPR15) |
| 174 | || regaddr == PT_ORIGGPR2) |
| 175 | collect_register (regcache, regno, buf + sizeof (long) - size); |
| 176 | else |
| 177 | collect_register (regcache, regno, buf); |
| 178 | } |
| 179 | else |
| 180 | collect_register (regcache, regno, buf); |
| 181 | } |
| 182 | |
| 183 | static void |
| 184 | s390_supply_ptrace_register (struct regcache *regcache, |
| 185 | int regno, const char *buf) |
| 186 | { |
| 187 | int size = register_size (regno); |
| 188 | if (size < sizeof (long)) |
| 189 | { |
| 190 | int regaddr = the_low_target.regmap[regno]; |
| 191 | |
| 192 | if ((regno ^ 1) < the_low_target.num_regs |
| 193 | && the_low_target.regmap[regno ^ 1] == regaddr) |
| 194 | { |
| 195 | supply_register (regcache, regno & ~1, buf); |
| 196 | supply_register (regcache, (regno & ~1) + 1, |
| 197 | buf + sizeof (long) - size); |
| 198 | } |
| 199 | else if (regaddr == PT_PSWMASK) |
| 200 | { |
| 201 | /* Convert 8-byte PSW mask to 4 bytes by setting bit 12 and copying |
| 202 | the basic addressing mode into the PSW address. */ |
| 203 | char *mask = alloca (size); |
| 204 | char *addr = alloca (register_size (regno ^ 1)); |
| 205 | memcpy (mask, buf, size); |
| 206 | mask[1] |= 0x8; |
| 207 | supply_register (regcache, regno, mask); |
| 208 | |
| 209 | collect_register (regcache, regno ^ 1, addr); |
| 210 | addr[0] &= ~0x80; |
| 211 | addr[0] |= (buf[size] & 0x80); |
| 212 | supply_register (regcache, regno ^ 1, addr); |
| 213 | } |
| 214 | else if (regaddr == PT_PSWADDR) |
| 215 | { |
| 216 | /* Convert 8-byte PSW address to 4 bytes by truncating, but |
| 217 | keeping the addressing mode bit (which was set from the mask). */ |
| 218 | char *addr = alloca (size); |
| 219 | char amode; |
| 220 | collect_register (regcache, regno, addr); |
| 221 | amode = addr[0] & 0x80; |
| 222 | memcpy (addr, buf + sizeof (long) - size, size); |
| 223 | addr[0] &= ~0x80; |
| 224 | addr[0] |= amode; |
| 225 | supply_register (regcache, regno, addr); |
| 226 | } |
| 227 | else if ((regaddr >= PT_GPR0 && regaddr <= PT_GPR15) |
| 228 | || regaddr == PT_ORIGGPR2) |
| 229 | supply_register (regcache, regno, buf + sizeof (long) - size); |
| 230 | else |
| 231 | supply_register (regcache, regno, buf); |
| 232 | } |
| 233 | else |
| 234 | supply_register (regcache, regno, buf); |
| 235 | } |
| 236 | |
| 237 | /* Provide only a fill function for the general register set. ps_lgetregs |
| 238 | will use this for NPTL support. */ |
| 239 | |
| 240 | static void s390_fill_gregset (struct regcache *regcache, void *buf) |
| 241 | { |
| 242 | int i; |
| 243 | |
| 244 | for (i = 0; i < the_low_target.num_regs; i++) |
| 245 | { |
| 246 | if (the_low_target.regmap[i] < PT_PSWMASK |
| 247 | || the_low_target.regmap[i] > PT_ACR15) |
| 248 | continue; |
| 249 | |
| 250 | s390_collect_ptrace_register (regcache, i, (char *) buf |
| 251 | + the_low_target.regmap[i]); |
| 252 | } |
| 253 | } |
| 254 | |
| 255 | /* Fill and store functions for extended register sets. */ |
| 256 | |
| 257 | static void |
| 258 | s390_fill_last_break (struct regcache *regcache, void *buf) |
| 259 | { |
| 260 | /* Last break address is read-only. */ |
| 261 | } |
| 262 | |
| 263 | static void |
| 264 | s390_store_last_break (struct regcache *regcache, const void *buf) |
| 265 | { |
| 266 | supply_register_by_name (regcache, "last_break", |
| 267 | (const char *)buf + 8 - register_size (0)); |
| 268 | } |
| 269 | |
| 270 | static void |
| 271 | s390_fill_system_call (struct regcache *regcache, void *buf) |
| 272 | { |
| 273 | collect_register_by_name (regcache, "system_call", buf); |
| 274 | } |
| 275 | |
| 276 | static void |
| 277 | s390_store_system_call (struct regcache *regcache, const void *buf) |
| 278 | { |
| 279 | supply_register_by_name (regcache, "system_call", buf); |
| 280 | } |
| 281 | |
| 282 | struct regset_info target_regsets[] = { |
| 283 | { 0, 0, 0, 0, GENERAL_REGS, s390_fill_gregset, NULL }, |
| 284 | /* Last break address is read-only; do not attempt PTRACE_SETREGSET. */ |
| 285 | { PTRACE_GETREGSET, PTRACE_GETREGSET, NT_S390_LAST_BREAK, 0, |
| 286 | EXTENDED_REGS, s390_fill_last_break, s390_store_last_break }, |
| 287 | { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_S390_SYSTEM_CALL, 0, |
| 288 | EXTENDED_REGS, s390_fill_system_call, s390_store_system_call }, |
| 289 | { 0, 0, 0, -1, -1, NULL, NULL } |
| 290 | }; |
| 291 | |
| 292 | |
| 293 | static const unsigned char s390_breakpoint[] = { 0, 1 }; |
| 294 | #define s390_breakpoint_len 2 |
| 295 | |
| 296 | static CORE_ADDR |
| 297 | s390_get_pc (struct regcache *regcache) |
| 298 | { |
| 299 | if (register_size (0) == 4) |
| 300 | { |
| 301 | unsigned int pswa; |
| 302 | collect_register_by_name (regcache, "pswa", &pswa); |
| 303 | return pswa & 0x7fffffff; |
| 304 | } |
| 305 | else |
| 306 | { |
| 307 | unsigned long pc; |
| 308 | collect_register_by_name (regcache, "pswa", &pc); |
| 309 | return pc; |
| 310 | } |
| 311 | } |
| 312 | |
| 313 | static void |
| 314 | s390_set_pc (struct regcache *regcache, CORE_ADDR newpc) |
| 315 | { |
| 316 | if (register_size (0) == 4) |
| 317 | { |
| 318 | unsigned int pswa; |
| 319 | collect_register_by_name (regcache, "pswa", &pswa); |
| 320 | pswa = (pswa & 0x80000000) | (newpc & 0x7fffffff); |
| 321 | supply_register_by_name (regcache, "pswa", &pswa); |
| 322 | } |
| 323 | else |
| 324 | { |
| 325 | unsigned long pc = newpc; |
| 326 | supply_register_by_name (regcache, "pswa", &pc); |
| 327 | } |
| 328 | } |
| 329 | |
| 330 | #ifdef __s390x__ |
| 331 | static unsigned long |
| 332 | s390_get_hwcap (void) |
| 333 | { |
| 334 | int wordsize = register_size (0); |
| 335 | unsigned char *data = alloca (2 * wordsize); |
| 336 | int offset = 0; |
| 337 | |
| 338 | while ((*the_target->read_auxv) (offset, data, 2 * wordsize) == 2 * wordsize) |
| 339 | { |
| 340 | if (wordsize == 4) |
| 341 | { |
| 342 | unsigned int *data_p = (unsigned int *)data; |
| 343 | if (data_p[0] == AT_HWCAP) |
| 344 | return data_p[1]; |
| 345 | } |
| 346 | else |
| 347 | { |
| 348 | unsigned long *data_p = (unsigned long *)data; |
| 349 | if (data_p[0] == AT_HWCAP) |
| 350 | return data_p[1]; |
| 351 | } |
| 352 | |
| 353 | offset += 2 * wordsize; |
| 354 | } |
| 355 | |
| 356 | return 0; |
| 357 | } |
| 358 | #endif |
| 359 | |
| 360 | static int |
| 361 | s390_check_regset (int pid, int regset, int regsize) |
| 362 | { |
| 363 | gdb_byte *buf = alloca (regsize); |
| 364 | struct iovec iov; |
| 365 | |
| 366 | iov.iov_base = buf; |
| 367 | iov.iov_len = regsize; |
| 368 | |
| 369 | if (ptrace (PTRACE_GETREGSET, pid, (long) regset, (long) &iov) < 0) |
| 370 | return 0; |
| 371 | else |
| 372 | return 1; |
| 373 | } |
| 374 | |
| 375 | static void |
| 376 | s390_arch_setup (void) |
| 377 | { |
| 378 | struct regset_info *regset; |
| 379 | |
| 380 | /* Check whether the kernel supports extra register sets. */ |
| 381 | int pid = pid_of (get_thread_lwp (current_inferior)); |
| 382 | int have_regset_last_break |
| 383 | = s390_check_regset (pid, NT_S390_LAST_BREAK, 8); |
| 384 | int have_regset_system_call |
| 385 | = s390_check_regset (pid, NT_S390_SYSTEM_CALL, 4); |
| 386 | |
| 387 | /* Update target_regsets according to available register sets. */ |
| 388 | for (regset = target_regsets; regset->fill_function != NULL; regset++) |
| 389 | if (regset->get_request == PTRACE_GETREGSET) |
| 390 | switch (regset->nt_type) |
| 391 | { |
| 392 | case NT_S390_LAST_BREAK: |
| 393 | regset->size = have_regset_last_break? 8 : 0; |
| 394 | break; |
| 395 | case NT_S390_SYSTEM_CALL: |
| 396 | regset->size = have_regset_system_call? 4 : 0; |
| 397 | break; |
| 398 | default: |
| 399 | break; |
| 400 | } |
| 401 | |
| 402 | /* Assume 31-bit inferior process. */ |
| 403 | if (have_regset_system_call) |
| 404 | init_registers_s390_linux32v2 (); |
| 405 | else if (have_regset_last_break) |
| 406 | init_registers_s390_linux32v1 (); |
| 407 | else |
| 408 | init_registers_s390_linux32 (); |
| 409 | |
| 410 | the_low_target.num_regs = s390_num_regs; |
| 411 | the_low_target.regmap = s390_regmap; |
| 412 | |
| 413 | /* On a 64-bit host, check the low bit of the (31-bit) PSWM |
| 414 | -- if this is one, we actually have a 64-bit inferior. */ |
| 415 | #ifdef __s390x__ |
| 416 | { |
| 417 | unsigned int pswm; |
| 418 | struct regcache *regcache = new_register_cache (); |
| 419 | fetch_inferior_registers (regcache, find_regno ("pswm")); |
| 420 | collect_register_by_name (regcache, "pswm", &pswm); |
| 421 | free_register_cache (regcache); |
| 422 | |
| 423 | if (pswm & 1) |
| 424 | { |
| 425 | if (have_regset_system_call) |
| 426 | init_registers_s390x_linux64v2 (); |
| 427 | else if (have_regset_last_break) |
| 428 | init_registers_s390x_linux64v1 (); |
| 429 | else |
| 430 | init_registers_s390x_linux64 (); |
| 431 | } |
| 432 | |
| 433 | /* For a 31-bit inferior, check whether the kernel supports |
| 434 | using the full 64-bit GPRs. */ |
| 435 | else if (s390_get_hwcap () & HWCAP_S390_HIGH_GPRS) |
| 436 | { |
| 437 | if (have_regset_system_call) |
| 438 | init_registers_s390_linux64v2 (); |
| 439 | else if (have_regset_last_break) |
| 440 | init_registers_s390_linux64v1 (); |
| 441 | else |
| 442 | init_registers_s390_linux64 (); |
| 443 | |
| 444 | the_low_target.num_regs = s390_num_regs_3264; |
| 445 | the_low_target.regmap = s390_regmap_3264; |
| 446 | } |
| 447 | } |
| 448 | #endif |
| 449 | } |
| 450 | |
| 451 | |
| 452 | static int |
| 453 | s390_breakpoint_at (CORE_ADDR pc) |
| 454 | { |
| 455 | unsigned char c[s390_breakpoint_len]; |
| 456 | read_inferior_memory (pc, c, s390_breakpoint_len); |
| 457 | return memcmp (c, s390_breakpoint, s390_breakpoint_len) == 0; |
| 458 | } |
| 459 | |
| 460 | |
| 461 | struct linux_target_ops the_low_target = { |
| 462 | s390_arch_setup, |
| 463 | s390_num_regs, |
| 464 | s390_regmap, |
| 465 | s390_cannot_fetch_register, |
| 466 | s390_cannot_store_register, |
| 467 | s390_get_pc, |
| 468 | s390_set_pc, |
| 469 | s390_breakpoint, |
| 470 | s390_breakpoint_len, |
| 471 | NULL, |
| 472 | s390_breakpoint_len, |
| 473 | s390_breakpoint_at, |
| 474 | NULL, |
| 475 | NULL, |
| 476 | NULL, |
| 477 | NULL, |
| 478 | s390_collect_ptrace_register, |
| 479 | s390_supply_ptrace_register, |
| 480 | }; |