| 1 | /* Cell SPU GNU/Linux multi-architecture debugging support. |
| 2 | Copyright (C) 2009-2017 Free Software Foundation, Inc. |
| 3 | |
| 4 | Contributed by Ulrich Weigand <uweigand@de.ibm.com>. |
| 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 | #include "defs.h" |
| 22 | #include "gdbcore.h" |
| 23 | #include "gdbcmd.h" |
| 24 | #include "arch-utils.h" |
| 25 | #include "observer.h" |
| 26 | #include "inferior.h" |
| 27 | #include "regcache.h" |
| 28 | #include "symfile.h" |
| 29 | #include "objfiles.h" |
| 30 | #include "solib.h" |
| 31 | #include "solist.h" |
| 32 | |
| 33 | #include "ppc-tdep.h" |
| 34 | #include "ppc-linux-tdep.h" |
| 35 | #include "spu-tdep.h" |
| 36 | |
| 37 | /* This module's target vector. */ |
| 38 | static struct target_ops spu_ops; |
| 39 | |
| 40 | /* Number of SPE objects loaded into the current inferior. */ |
| 41 | static int spu_nr_solib; |
| 42 | |
| 43 | /* Stand-alone SPE executable? */ |
| 44 | #define spu_standalone_p() \ |
| 45 | (symfile_objfile && symfile_objfile->obfd \ |
| 46 | && bfd_get_arch (symfile_objfile->obfd) == bfd_arch_spu) |
| 47 | |
| 48 | /* PPU side system calls. */ |
| 49 | #define INSTR_SC 0x44000002 |
| 50 | #define NR_spu_run 0x0116 |
| 51 | |
| 52 | /* If the PPU thread is currently stopped on a spu_run system call, |
| 53 | return to FD and ADDR the file handle and NPC parameter address |
| 54 | used with the system call. Return non-zero if successful. */ |
| 55 | static int |
| 56 | parse_spufs_run (ptid_t ptid, int *fd, CORE_ADDR *addr) |
| 57 | { |
| 58 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
| 59 | struct cleanup *old_chain; |
| 60 | struct gdbarch_tdep *tdep; |
| 61 | struct regcache *regcache; |
| 62 | gdb_byte buf[4]; |
| 63 | ULONGEST regval; |
| 64 | |
| 65 | /* If we're not on PPU, there's nothing to detect. */ |
| 66 | if (gdbarch_bfd_arch_info (target_gdbarch ())->arch != bfd_arch_powerpc) |
| 67 | return 0; |
| 68 | |
| 69 | /* If we're called too early (e.g. after fork), we cannot |
| 70 | access the inferior yet. */ |
| 71 | if (find_inferior_ptid (ptid) == NULL) |
| 72 | return 0; |
| 73 | |
| 74 | /* Get PPU-side registers. */ |
| 75 | regcache = get_thread_arch_regcache (ptid, target_gdbarch ()); |
| 76 | tdep = gdbarch_tdep (target_gdbarch ()); |
| 77 | |
| 78 | /* Fetch instruction preceding current NIP. */ |
| 79 | { |
| 80 | scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid); |
| 81 | inferior_ptid = ptid; |
| 82 | regval = target_read_memory (regcache_read_pc (regcache) - 4, buf, 4); |
| 83 | } |
| 84 | if (regval != 0) |
| 85 | return 0; |
| 86 | /* It should be a "sc" instruction. */ |
| 87 | if (extract_unsigned_integer (buf, 4, byte_order) != INSTR_SC) |
| 88 | return 0; |
| 89 | /* System call number should be NR_spu_run. */ |
| 90 | regcache_cooked_read_unsigned (regcache, tdep->ppc_gp0_regnum, ®val); |
| 91 | if (regval != NR_spu_run) |
| 92 | return 0; |
| 93 | |
| 94 | /* Register 3 contains fd, register 4 the NPC param pointer. */ |
| 95 | regcache_cooked_read_unsigned (regcache, PPC_ORIG_R3_REGNUM, ®val); |
| 96 | *fd = (int) regval; |
| 97 | regcache_cooked_read_unsigned (regcache, tdep->ppc_gp0_regnum + 4, ®val); |
| 98 | *addr = (CORE_ADDR) regval; |
| 99 | return 1; |
| 100 | } |
| 101 | |
| 102 | /* Find gdbarch for SPU context SPUFS_FD. */ |
| 103 | static struct gdbarch * |
| 104 | spu_gdbarch (int spufs_fd) |
| 105 | { |
| 106 | struct gdbarch_info info; |
| 107 | gdbarch_info_init (&info); |
| 108 | info.bfd_arch_info = bfd_lookup_arch (bfd_arch_spu, bfd_mach_spu); |
| 109 | info.byte_order = BFD_ENDIAN_BIG; |
| 110 | info.osabi = GDB_OSABI_LINUX; |
| 111 | info.id = &spufs_fd; |
| 112 | return gdbarch_find_by_info (info); |
| 113 | } |
| 114 | |
| 115 | /* Override the to_thread_architecture routine. */ |
| 116 | static struct gdbarch * |
| 117 | spu_thread_architecture (struct target_ops *ops, ptid_t ptid) |
| 118 | { |
| 119 | int spufs_fd; |
| 120 | CORE_ADDR spufs_addr; |
| 121 | |
| 122 | if (parse_spufs_run (ptid, &spufs_fd, &spufs_addr)) |
| 123 | return spu_gdbarch (spufs_fd); |
| 124 | |
| 125 | return target_gdbarch (); |
| 126 | } |
| 127 | |
| 128 | /* Override the to_region_ok_for_hw_watchpoint routine. */ |
| 129 | static int |
| 130 | spu_region_ok_for_hw_watchpoint (struct target_ops *self, |
| 131 | CORE_ADDR addr, int len) |
| 132 | { |
| 133 | struct target_ops *ops_beneath = find_target_beneath (self); |
| 134 | |
| 135 | /* We cannot watch SPU local store. */ |
| 136 | if (SPUADDR_SPU (addr) != -1) |
| 137 | return 0; |
| 138 | |
| 139 | return ops_beneath->to_region_ok_for_hw_watchpoint (ops_beneath, addr, len); |
| 140 | } |
| 141 | |
| 142 | /* Override the to_fetch_registers routine. */ |
| 143 | static void |
| 144 | spu_fetch_registers (struct target_ops *ops, |
| 145 | struct regcache *regcache, int regno) |
| 146 | { |
| 147 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 148 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
| 149 | struct target_ops *ops_beneath = find_target_beneath (ops); |
| 150 | int spufs_fd; |
| 151 | CORE_ADDR spufs_addr; |
| 152 | |
| 153 | /* Since we use functions that rely on inferior_ptid, we need to set and |
| 154 | restore it. */ |
| 155 | scoped_restore save_ptid |
| 156 | = make_scoped_restore (&inferior_ptid, regcache_get_ptid (regcache)); |
| 157 | |
| 158 | /* This version applies only if we're currently in spu_run. */ |
| 159 | if (gdbarch_bfd_arch_info (gdbarch)->arch != bfd_arch_spu) |
| 160 | { |
| 161 | ops_beneath->to_fetch_registers (ops_beneath, regcache, regno); |
| 162 | return; |
| 163 | } |
| 164 | |
| 165 | /* We must be stopped on a spu_run system call. */ |
| 166 | if (!parse_spufs_run (inferior_ptid, &spufs_fd, &spufs_addr)) |
| 167 | return; |
| 168 | |
| 169 | /* The ID register holds the spufs file handle. */ |
| 170 | if (regno == -1 || regno == SPU_ID_REGNUM) |
| 171 | { |
| 172 | gdb_byte buf[4]; |
| 173 | store_unsigned_integer (buf, 4, byte_order, spufs_fd); |
| 174 | regcache_raw_supply (regcache, SPU_ID_REGNUM, buf); |
| 175 | } |
| 176 | |
| 177 | /* The NPC register is found in PPC memory at SPUFS_ADDR. */ |
| 178 | if (regno == -1 || regno == SPU_PC_REGNUM) |
| 179 | { |
| 180 | gdb_byte buf[4]; |
| 181 | |
| 182 | if (target_read (ops_beneath, TARGET_OBJECT_MEMORY, NULL, |
| 183 | buf, spufs_addr, sizeof buf) == sizeof buf) |
| 184 | regcache_raw_supply (regcache, SPU_PC_REGNUM, buf); |
| 185 | } |
| 186 | |
| 187 | /* The GPRs are found in the "regs" spufs file. */ |
| 188 | if (regno == -1 || (regno >= 0 && regno < SPU_NUM_GPRS)) |
| 189 | { |
| 190 | gdb_byte buf[16 * SPU_NUM_GPRS]; |
| 191 | char annex[32]; |
| 192 | int i; |
| 193 | |
| 194 | xsnprintf (annex, sizeof annex, "%d/regs", spufs_fd); |
| 195 | if (target_read (ops_beneath, TARGET_OBJECT_SPU, annex, |
| 196 | buf, 0, sizeof buf) == sizeof buf) |
| 197 | for (i = 0; i < SPU_NUM_GPRS; i++) |
| 198 | regcache_raw_supply (regcache, i, buf + i*16); |
| 199 | } |
| 200 | } |
| 201 | |
| 202 | /* Override the to_store_registers routine. */ |
| 203 | static void |
| 204 | spu_store_registers (struct target_ops *ops, |
| 205 | struct regcache *regcache, int regno) |
| 206 | { |
| 207 | struct gdbarch *gdbarch = get_regcache_arch (regcache); |
| 208 | struct target_ops *ops_beneath = find_target_beneath (ops); |
| 209 | int spufs_fd; |
| 210 | CORE_ADDR spufs_addr; |
| 211 | |
| 212 | /* Since we use functions that rely on inferior_ptid, we need to set and |
| 213 | restore it. */ |
| 214 | scoped_restore save_ptid |
| 215 | = make_scoped_restore (&inferior_ptid, regcache_get_ptid (regcache)); |
| 216 | |
| 217 | /* This version applies only if we're currently in spu_run. */ |
| 218 | if (gdbarch_bfd_arch_info (gdbarch)->arch != bfd_arch_spu) |
| 219 | { |
| 220 | ops_beneath->to_store_registers (ops_beneath, regcache, regno); |
| 221 | return; |
| 222 | } |
| 223 | |
| 224 | /* We must be stopped on a spu_run system call. */ |
| 225 | if (!parse_spufs_run (inferior_ptid, &spufs_fd, &spufs_addr)) |
| 226 | return; |
| 227 | |
| 228 | /* The NPC register is found in PPC memory at SPUFS_ADDR. */ |
| 229 | if (regno == -1 || regno == SPU_PC_REGNUM) |
| 230 | { |
| 231 | gdb_byte buf[4]; |
| 232 | regcache_raw_collect (regcache, SPU_PC_REGNUM, buf); |
| 233 | |
| 234 | target_write (ops_beneath, TARGET_OBJECT_MEMORY, NULL, |
| 235 | buf, spufs_addr, sizeof buf); |
| 236 | } |
| 237 | |
| 238 | /* The GPRs are found in the "regs" spufs file. */ |
| 239 | if (regno == -1 || (regno >= 0 && regno < SPU_NUM_GPRS)) |
| 240 | { |
| 241 | gdb_byte buf[16 * SPU_NUM_GPRS]; |
| 242 | char annex[32]; |
| 243 | int i; |
| 244 | |
| 245 | for (i = 0; i < SPU_NUM_GPRS; i++) |
| 246 | regcache_raw_collect (regcache, i, buf + i*16); |
| 247 | |
| 248 | xsnprintf (annex, sizeof annex, "%d/regs", spufs_fd); |
| 249 | target_write (ops_beneath, TARGET_OBJECT_SPU, annex, |
| 250 | buf, 0, sizeof buf); |
| 251 | } |
| 252 | } |
| 253 | |
| 254 | /* Override the to_xfer_partial routine. */ |
| 255 | static enum target_xfer_status |
| 256 | spu_xfer_partial (struct target_ops *ops, enum target_object object, |
| 257 | const char *annex, gdb_byte *readbuf, |
| 258 | const gdb_byte *writebuf, ULONGEST offset, ULONGEST len, |
| 259 | ULONGEST *xfered_len) |
| 260 | { |
| 261 | struct target_ops *ops_beneath = find_target_beneath (ops); |
| 262 | |
| 263 | /* Use the "mem" spufs file to access SPU local store. */ |
| 264 | if (object == TARGET_OBJECT_MEMORY) |
| 265 | { |
| 266 | int fd = SPUADDR_SPU (offset); |
| 267 | CORE_ADDR addr = SPUADDR_ADDR (offset); |
| 268 | char mem_annex[32], lslr_annex[32]; |
| 269 | gdb_byte buf[32]; |
| 270 | ULONGEST lslr; |
| 271 | enum target_xfer_status ret; |
| 272 | |
| 273 | if (fd >= 0) |
| 274 | { |
| 275 | xsnprintf (mem_annex, sizeof mem_annex, "%d/mem", fd); |
| 276 | ret = ops_beneath->to_xfer_partial (ops_beneath, TARGET_OBJECT_SPU, |
| 277 | mem_annex, readbuf, writebuf, |
| 278 | addr, len, xfered_len); |
| 279 | if (ret == TARGET_XFER_OK) |
| 280 | return ret; |
| 281 | |
| 282 | /* SPU local store access wraps the address around at the |
| 283 | local store limit. We emulate this here. To avoid needing |
| 284 | an extra access to retrieve the LSLR, we only do that after |
| 285 | trying the original address first, and getting end-of-file. */ |
| 286 | xsnprintf (lslr_annex, sizeof lslr_annex, "%d/lslr", fd); |
| 287 | memset (buf, 0, sizeof buf); |
| 288 | if (ops_beneath->to_xfer_partial (ops_beneath, TARGET_OBJECT_SPU, |
| 289 | lslr_annex, buf, NULL, |
| 290 | 0, sizeof buf, xfered_len) |
| 291 | != TARGET_XFER_OK) |
| 292 | return ret; |
| 293 | |
| 294 | lslr = strtoulst ((char *) buf, NULL, 16); |
| 295 | return ops_beneath->to_xfer_partial (ops_beneath, TARGET_OBJECT_SPU, |
| 296 | mem_annex, readbuf, writebuf, |
| 297 | addr & lslr, len, xfered_len); |
| 298 | } |
| 299 | } |
| 300 | |
| 301 | return ops_beneath->to_xfer_partial (ops_beneath, object, annex, |
| 302 | readbuf, writebuf, offset, len, xfered_len); |
| 303 | } |
| 304 | |
| 305 | /* Override the to_search_memory routine. */ |
| 306 | static int |
| 307 | spu_search_memory (struct target_ops* ops, |
| 308 | CORE_ADDR start_addr, ULONGEST search_space_len, |
| 309 | const gdb_byte *pattern, ULONGEST pattern_len, |
| 310 | CORE_ADDR *found_addrp) |
| 311 | { |
| 312 | struct target_ops *ops_beneath = find_target_beneath (ops); |
| 313 | |
| 314 | /* For SPU local store, always fall back to the simple method. */ |
| 315 | if (SPUADDR_SPU (start_addr) >= 0) |
| 316 | return simple_search_memory (ops, |
| 317 | start_addr, search_space_len, |
| 318 | pattern, pattern_len, found_addrp); |
| 319 | |
| 320 | return ops_beneath->to_search_memory (ops_beneath, |
| 321 | start_addr, search_space_len, |
| 322 | pattern, pattern_len, found_addrp); |
| 323 | } |
| 324 | |
| 325 | |
| 326 | /* Push and pop the SPU multi-architecture support target. */ |
| 327 | |
| 328 | static void |
| 329 | spu_multiarch_activate (void) |
| 330 | { |
| 331 | /* If GDB was configured without SPU architecture support, |
| 332 | we cannot install SPU multi-architecture support either. */ |
| 333 | if (spu_gdbarch (-1) == NULL) |
| 334 | return; |
| 335 | |
| 336 | push_target (&spu_ops); |
| 337 | |
| 338 | /* Make sure the thread architecture is re-evaluated. */ |
| 339 | registers_changed (); |
| 340 | } |
| 341 | |
| 342 | static void |
| 343 | spu_multiarch_deactivate (void) |
| 344 | { |
| 345 | unpush_target (&spu_ops); |
| 346 | |
| 347 | /* Make sure the thread architecture is re-evaluated. */ |
| 348 | registers_changed (); |
| 349 | } |
| 350 | |
| 351 | static void |
| 352 | spu_multiarch_inferior_created (struct target_ops *ops, int from_tty) |
| 353 | { |
| 354 | if (spu_standalone_p ()) |
| 355 | spu_multiarch_activate (); |
| 356 | } |
| 357 | |
| 358 | static void |
| 359 | spu_multiarch_solib_loaded (struct so_list *so) |
| 360 | { |
| 361 | if (!spu_standalone_p ()) |
| 362 | if (so->abfd && bfd_get_arch (so->abfd) == bfd_arch_spu) |
| 363 | if (spu_nr_solib++ == 0) |
| 364 | spu_multiarch_activate (); |
| 365 | } |
| 366 | |
| 367 | static void |
| 368 | spu_multiarch_solib_unloaded (struct so_list *so) |
| 369 | { |
| 370 | if (!spu_standalone_p ()) |
| 371 | if (so->abfd && bfd_get_arch (so->abfd) == bfd_arch_spu) |
| 372 | if (--spu_nr_solib == 0) |
| 373 | spu_multiarch_deactivate (); |
| 374 | } |
| 375 | |
| 376 | static void |
| 377 | spu_mourn_inferior (struct target_ops *ops) |
| 378 | { |
| 379 | struct target_ops *ops_beneath = find_target_beneath (ops); |
| 380 | |
| 381 | ops_beneath->to_mourn_inferior (ops_beneath); |
| 382 | spu_multiarch_deactivate (); |
| 383 | } |
| 384 | |
| 385 | |
| 386 | /* Initialize the SPU multi-architecture support target. */ |
| 387 | |
| 388 | static void |
| 389 | init_spu_ops (void) |
| 390 | { |
| 391 | spu_ops.to_shortname = "spu"; |
| 392 | spu_ops.to_longname = "SPU multi-architecture support."; |
| 393 | spu_ops.to_doc = "SPU multi-architecture support."; |
| 394 | spu_ops.to_mourn_inferior = spu_mourn_inferior; |
| 395 | spu_ops.to_fetch_registers = spu_fetch_registers; |
| 396 | spu_ops.to_store_registers = spu_store_registers; |
| 397 | spu_ops.to_xfer_partial = spu_xfer_partial; |
| 398 | spu_ops.to_search_memory = spu_search_memory; |
| 399 | spu_ops.to_region_ok_for_hw_watchpoint = spu_region_ok_for_hw_watchpoint; |
| 400 | spu_ops.to_thread_architecture = spu_thread_architecture; |
| 401 | spu_ops.to_stratum = arch_stratum; |
| 402 | spu_ops.to_magic = OPS_MAGIC; |
| 403 | } |
| 404 | |
| 405 | /* -Wmissing-prototypes */ |
| 406 | extern initialize_file_ftype _initialize_spu_multiarch; |
| 407 | |
| 408 | void |
| 409 | _initialize_spu_multiarch (void) |
| 410 | { |
| 411 | /* Install ourselves on the target stack. */ |
| 412 | init_spu_ops (); |
| 413 | complete_target_initialization (&spu_ops); |
| 414 | |
| 415 | /* Install observers to watch for SPU objects. */ |
| 416 | observer_attach_inferior_created (spu_multiarch_inferior_created); |
| 417 | observer_attach_solib_loaded (spu_multiarch_solib_loaded); |
| 418 | observer_attach_solib_unloaded (spu_multiarch_solib_unloaded); |
| 419 | } |
| 420 | |