| 1 | /* PPC GNU/Linux native support. |
| 2 | |
| 3 | Copyright (C) 1988-2020 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 "frame.h" |
| 22 | #include "inferior.h" |
| 23 | #include "gdbthread.h" |
| 24 | #include "gdbcore.h" |
| 25 | #include "regcache.h" |
| 26 | #include "regset.h" |
| 27 | #include "target.h" |
| 28 | #include "linux-nat.h" |
| 29 | #include <sys/types.h> |
| 30 | #include <signal.h> |
| 31 | #include <sys/user.h> |
| 32 | #include <sys/ioctl.h> |
| 33 | #include <sys/uio.h> |
| 34 | #include "gdbsupport/gdb_wait.h" |
| 35 | #include <fcntl.h> |
| 36 | #include <sys/procfs.h> |
| 37 | #include "nat/gdb_ptrace.h" |
| 38 | #include "nat/linux-ptrace.h" |
| 39 | #include "inf-ptrace.h" |
| 40 | #include <algorithm> |
| 41 | #include <unordered_map> |
| 42 | #include <list> |
| 43 | |
| 44 | /* Prototypes for supply_gregset etc. */ |
| 45 | #include "gregset.h" |
| 46 | #include "ppc-tdep.h" |
| 47 | #include "ppc-linux-tdep.h" |
| 48 | |
| 49 | /* Required when using the AUXV. */ |
| 50 | #include "elf/common.h" |
| 51 | #include "auxv.h" |
| 52 | |
| 53 | #include "arch/ppc-linux-common.h" |
| 54 | #include "arch/ppc-linux-tdesc.h" |
| 55 | #include "nat/ppc-linux.h" |
| 56 | #include "linux-tdep.h" |
| 57 | |
| 58 | /* Similarly for the hardware watchpoint support. These requests are used |
| 59 | when the PowerPC HWDEBUG ptrace interface is not available. */ |
| 60 | #ifndef PTRACE_GET_DEBUGREG |
| 61 | #define PTRACE_GET_DEBUGREG 25 |
| 62 | #endif |
| 63 | #ifndef PTRACE_SET_DEBUGREG |
| 64 | #define PTRACE_SET_DEBUGREG 26 |
| 65 | #endif |
| 66 | #ifndef PTRACE_GETSIGINFO |
| 67 | #define PTRACE_GETSIGINFO 0x4202 |
| 68 | #endif |
| 69 | |
| 70 | /* These requests are used when the PowerPC HWDEBUG ptrace interface is |
| 71 | available. It exposes the debug facilities of PowerPC processors, as well |
| 72 | as additional features of BookE processors, such as ranged breakpoints and |
| 73 | watchpoints and hardware-accelerated condition evaluation. */ |
| 74 | #ifndef PPC_PTRACE_GETHWDBGINFO |
| 75 | |
| 76 | /* Not having PPC_PTRACE_GETHWDBGINFO defined means that the PowerPC HWDEBUG |
| 77 | ptrace interface is not present in ptrace.h, so we'll have to pretty much |
| 78 | include it all here so that the code at least compiles on older systems. */ |
| 79 | #define PPC_PTRACE_GETHWDBGINFO 0x89 |
| 80 | #define PPC_PTRACE_SETHWDEBUG 0x88 |
| 81 | #define PPC_PTRACE_DELHWDEBUG 0x87 |
| 82 | |
| 83 | struct ppc_debug_info |
| 84 | { |
| 85 | uint32_t version; /* Only version 1 exists to date. */ |
| 86 | uint32_t num_instruction_bps; |
| 87 | uint32_t num_data_bps; |
| 88 | uint32_t num_condition_regs; |
| 89 | uint32_t data_bp_alignment; |
| 90 | uint32_t sizeof_condition; /* size of the DVC register. */ |
| 91 | uint64_t features; |
| 92 | }; |
| 93 | |
| 94 | /* Features will have bits indicating whether there is support for: */ |
| 95 | #define PPC_DEBUG_FEATURE_INSN_BP_RANGE 0x1 |
| 96 | #define PPC_DEBUG_FEATURE_INSN_BP_MASK 0x2 |
| 97 | #define PPC_DEBUG_FEATURE_DATA_BP_RANGE 0x4 |
| 98 | #define PPC_DEBUG_FEATURE_DATA_BP_MASK 0x8 |
| 99 | |
| 100 | struct ppc_hw_breakpoint |
| 101 | { |
| 102 | uint32_t version; /* currently, version must be 1 */ |
| 103 | uint32_t trigger_type; /* only some combinations allowed */ |
| 104 | uint32_t addr_mode; /* address match mode */ |
| 105 | uint32_t condition_mode; /* break/watchpoint condition flags */ |
| 106 | uint64_t addr; /* break/watchpoint address */ |
| 107 | uint64_t addr2; /* range end or mask */ |
| 108 | uint64_t condition_value; /* contents of the DVC register */ |
| 109 | }; |
| 110 | |
| 111 | /* Trigger type. */ |
| 112 | #define PPC_BREAKPOINT_TRIGGER_EXECUTE 0x1 |
| 113 | #define PPC_BREAKPOINT_TRIGGER_READ 0x2 |
| 114 | #define PPC_BREAKPOINT_TRIGGER_WRITE 0x4 |
| 115 | #define PPC_BREAKPOINT_TRIGGER_RW 0x6 |
| 116 | |
| 117 | /* Address mode. */ |
| 118 | #define PPC_BREAKPOINT_MODE_EXACT 0x0 |
| 119 | #define PPC_BREAKPOINT_MODE_RANGE_INCLUSIVE 0x1 |
| 120 | #define PPC_BREAKPOINT_MODE_RANGE_EXCLUSIVE 0x2 |
| 121 | #define PPC_BREAKPOINT_MODE_MASK 0x3 |
| 122 | |
| 123 | /* Condition mode. */ |
| 124 | #define PPC_BREAKPOINT_CONDITION_NONE 0x0 |
| 125 | #define PPC_BREAKPOINT_CONDITION_AND 0x1 |
| 126 | #define PPC_BREAKPOINT_CONDITION_EXACT 0x1 |
| 127 | #define PPC_BREAKPOINT_CONDITION_OR 0x2 |
| 128 | #define PPC_BREAKPOINT_CONDITION_AND_OR 0x3 |
| 129 | #define PPC_BREAKPOINT_CONDITION_BE_ALL 0x00ff0000 |
| 130 | #define PPC_BREAKPOINT_CONDITION_BE_SHIFT 16 |
| 131 | #define PPC_BREAKPOINT_CONDITION_BE(n) \ |
| 132 | (1<<((n)+PPC_BREAKPOINT_CONDITION_BE_SHIFT)) |
| 133 | #endif /* PPC_PTRACE_GETHWDBGINFO */ |
| 134 | |
| 135 | /* Feature defined on Linux kernel v3.9: DAWR interface, that enables wider |
| 136 | watchpoint (up to 512 bytes). */ |
| 137 | #ifndef PPC_DEBUG_FEATURE_DATA_BP_DAWR |
| 138 | #define PPC_DEBUG_FEATURE_DATA_BP_DAWR 0x10 |
| 139 | #endif /* PPC_DEBUG_FEATURE_DATA_BP_DAWR */ |
| 140 | |
| 141 | /* The version of the PowerPC HWDEBUG kernel interface that we will use, if |
| 142 | available. */ |
| 143 | #define PPC_DEBUG_CURRENT_VERSION 1 |
| 144 | |
| 145 | /* Similarly for the general-purpose (gp0 -- gp31) |
| 146 | and floating-point registers (fp0 -- fp31). */ |
| 147 | #ifndef PTRACE_GETREGS |
| 148 | #define PTRACE_GETREGS 12 |
| 149 | #endif |
| 150 | #ifndef PTRACE_SETREGS |
| 151 | #define PTRACE_SETREGS 13 |
| 152 | #endif |
| 153 | #ifndef PTRACE_GETFPREGS |
| 154 | #define PTRACE_GETFPREGS 14 |
| 155 | #endif |
| 156 | #ifndef PTRACE_SETFPREGS |
| 157 | #define PTRACE_SETFPREGS 15 |
| 158 | #endif |
| 159 | |
| 160 | /* This oddity is because the Linux kernel defines elf_vrregset_t as |
| 161 | an array of 33 16 bytes long elements. I.e. it leaves out vrsave. |
| 162 | However the PTRACE_GETVRREGS and PTRACE_SETVRREGS requests return |
| 163 | the vrsave as an extra 4 bytes at the end. I opted for creating a |
| 164 | flat array of chars, so that it is easier to manipulate for gdb. |
| 165 | |
| 166 | There are 32 vector registers 16 bytes longs, plus a VSCR register |
| 167 | which is only 4 bytes long, but is fetched as a 16 bytes |
| 168 | quantity. Up to here we have the elf_vrregset_t structure. |
| 169 | Appended to this there is space for the VRSAVE register: 4 bytes. |
| 170 | Even though this vrsave register is not included in the regset |
| 171 | typedef, it is handled by the ptrace requests. |
| 172 | |
| 173 | The layout is like this (where x is the actual value of the vscr reg): */ |
| 174 | |
| 175 | /* *INDENT-OFF* */ |
| 176 | /* |
| 177 | Big-Endian: |
| 178 | |.|.|.|.|.....|.|.|.|.||.|.|.|x||.| |
| 179 | <-------> <-------><-------><-> |
| 180 | VR0 VR31 VSCR VRSAVE |
| 181 | Little-Endian: |
| 182 | |.|.|.|.|.....|.|.|.|.||X|.|.|.||.| |
| 183 | <-------> <-------><-------><-> |
| 184 | VR0 VR31 VSCR VRSAVE |
| 185 | */ |
| 186 | /* *INDENT-ON* */ |
| 187 | |
| 188 | typedef char gdb_vrregset_t[PPC_LINUX_SIZEOF_VRREGSET]; |
| 189 | |
| 190 | /* This is the layout of the POWER7 VSX registers and the way they overlap |
| 191 | with the existing FPR and VMX registers. |
| 192 | |
| 193 | VSR doubleword 0 VSR doubleword 1 |
| 194 | ---------------------------------------------------------------- |
| 195 | VSR[0] | FPR[0] | | |
| 196 | ---------------------------------------------------------------- |
| 197 | VSR[1] | FPR[1] | | |
| 198 | ---------------------------------------------------------------- |
| 199 | | ... | | |
| 200 | | ... | | |
| 201 | ---------------------------------------------------------------- |
| 202 | VSR[30] | FPR[30] | | |
| 203 | ---------------------------------------------------------------- |
| 204 | VSR[31] | FPR[31] | | |
| 205 | ---------------------------------------------------------------- |
| 206 | VSR[32] | VR[0] | |
| 207 | ---------------------------------------------------------------- |
| 208 | VSR[33] | VR[1] | |
| 209 | ---------------------------------------------------------------- |
| 210 | | ... | |
| 211 | | ... | |
| 212 | ---------------------------------------------------------------- |
| 213 | VSR[62] | VR[30] | |
| 214 | ---------------------------------------------------------------- |
| 215 | VSR[63] | VR[31] | |
| 216 | ---------------------------------------------------------------- |
| 217 | |
| 218 | VSX has 64 128bit registers. The first 32 registers overlap with |
| 219 | the FP registers (doubleword 0) and hence extend them with additional |
| 220 | 64 bits (doubleword 1). The other 32 regs overlap with the VMX |
| 221 | registers. */ |
| 222 | typedef char gdb_vsxregset_t[PPC_LINUX_SIZEOF_VSXREGSET]; |
| 223 | |
| 224 | /* On PPC processors that support the Signal Processing Extension |
| 225 | (SPE) APU, the general-purpose registers are 64 bits long. |
| 226 | However, the ordinary Linux kernel PTRACE_PEEKUSER / PTRACE_POKEUSER |
| 227 | ptrace calls only access the lower half of each register, to allow |
| 228 | them to behave the same way they do on non-SPE systems. There's a |
| 229 | separate pair of calls, PTRACE_GETEVRREGS / PTRACE_SETEVRREGS, that |
| 230 | read and write the top halves of all the general-purpose registers |
| 231 | at once, along with some SPE-specific registers. |
| 232 | |
| 233 | GDB itself continues to claim the general-purpose registers are 32 |
| 234 | bits long. It has unnamed raw registers that hold the upper halves |
| 235 | of the gprs, and the full 64-bit SIMD views of the registers, |
| 236 | 'ev0' -- 'ev31', are pseudo-registers that splice the top and |
| 237 | bottom halves together. |
| 238 | |
| 239 | This is the structure filled in by PTRACE_GETEVRREGS and written to |
| 240 | the inferior's registers by PTRACE_SETEVRREGS. */ |
| 241 | struct gdb_evrregset_t |
| 242 | { |
| 243 | unsigned long evr[32]; |
| 244 | unsigned long long acc; |
| 245 | unsigned long spefscr; |
| 246 | }; |
| 247 | |
| 248 | /* Non-zero if our kernel may support the PTRACE_GETVSXREGS and |
| 249 | PTRACE_SETVSXREGS requests, for reading and writing the VSX |
| 250 | POWER7 registers 0 through 31. Zero if we've tried one of them and |
| 251 | gotten an error. Note that VSX registers 32 through 63 overlap |
| 252 | with VR registers 0 through 31. */ |
| 253 | int have_ptrace_getsetvsxregs = 1; |
| 254 | |
| 255 | /* Non-zero if our kernel may support the PTRACE_GETVRREGS and |
| 256 | PTRACE_SETVRREGS requests, for reading and writing the Altivec |
| 257 | registers. Zero if we've tried one of them and gotten an |
| 258 | error. */ |
| 259 | int have_ptrace_getvrregs = 1; |
| 260 | |
| 261 | /* Non-zero if our kernel may support the PTRACE_GETEVRREGS and |
| 262 | PTRACE_SETEVRREGS requests, for reading and writing the SPE |
| 263 | registers. Zero if we've tried one of them and gotten an |
| 264 | error. */ |
| 265 | int have_ptrace_getsetevrregs = 1; |
| 266 | |
| 267 | /* Non-zero if our kernel may support the PTRACE_GETREGS and |
| 268 | PTRACE_SETREGS requests, for reading and writing the |
| 269 | general-purpose registers. Zero if we've tried one of |
| 270 | them and gotten an error. */ |
| 271 | int have_ptrace_getsetregs = 1; |
| 272 | |
| 273 | /* Non-zero if our kernel may support the PTRACE_GETFPREGS and |
| 274 | PTRACE_SETFPREGS requests, for reading and writing the |
| 275 | floating-pointers registers. Zero if we've tried one of |
| 276 | them and gotten an error. */ |
| 277 | int have_ptrace_getsetfpregs = 1; |
| 278 | |
| 279 | /* Private arch info associated with each thread lwp_info object, used |
| 280 | for debug register handling. */ |
| 281 | |
| 282 | struct arch_lwp_info |
| 283 | { |
| 284 | /* When true, indicates that the debug registers installed in the |
| 285 | thread no longer correspond to the watchpoints and breakpoints |
| 286 | requested by GDB. */ |
| 287 | bool debug_regs_stale; |
| 288 | |
| 289 | /* We need a back-reference to the PTID of the thread so that we can |
| 290 | cleanup the debug register state of the thread in |
| 291 | low_delete_thread. */ |
| 292 | ptid_t lwp_ptid; |
| 293 | }; |
| 294 | |
| 295 | /* Class used to detect which set of ptrace requests that |
| 296 | ppc_linux_nat_target will use to install and remove hardware |
| 297 | breakpoints and watchpoints. |
| 298 | |
| 299 | The interface is only detected once, testing the ptrace calls. The |
| 300 | result can indicate that no interface is available. |
| 301 | |
| 302 | The Linux kernel provides two different sets of ptrace requests to |
| 303 | handle hardware watchpoints and breakpoints for Power: |
| 304 | |
| 305 | - PPC_PTRACE_GETHWDBGINFO, PPC_PTRACE_SETHWDEBUG, and |
| 306 | PPC_PTRACE_DELHWDEBUG. |
| 307 | |
| 308 | Or |
| 309 | |
| 310 | - PTRACE_SET_DEBUGREG and PTRACE_GET_DEBUGREG |
| 311 | |
| 312 | The first set is the more flexible one and allows setting watchpoints |
| 313 | with a variable watched region length and, for BookE processors, |
| 314 | multiple types of debug registers (e.g. hardware breakpoints and |
| 315 | hardware-assisted conditions for watchpoints). The second one only |
| 316 | allows setting one debug register, a watchpoint, so we only use it if |
| 317 | the first one is not available. */ |
| 318 | |
| 319 | class ppc_linux_dreg_interface |
| 320 | { |
| 321 | public: |
| 322 | |
| 323 | ppc_linux_dreg_interface () |
| 324 | : m_interface (), m_hwdebug_info () |
| 325 | { |
| 326 | }; |
| 327 | |
| 328 | DISABLE_COPY_AND_ASSIGN (ppc_linux_dreg_interface); |
| 329 | |
| 330 | /* One and only one of these three functions returns true, indicating |
| 331 | whether the corresponding interface is the one we detected. The |
| 332 | interface must already have been detected as a precontidion. */ |
| 333 | |
| 334 | bool hwdebug_p () |
| 335 | { |
| 336 | gdb_assert (detected_p ()); |
| 337 | return *m_interface == HWDEBUG; |
| 338 | } |
| 339 | |
| 340 | bool debugreg_p () |
| 341 | { |
| 342 | gdb_assert (detected_p ()); |
| 343 | return *m_interface == DEBUGREG; |
| 344 | } |
| 345 | |
| 346 | bool unavailable_p () |
| 347 | { |
| 348 | gdb_assert (detected_p ()); |
| 349 | return *m_interface == UNAVAILABLE; |
| 350 | } |
| 351 | |
| 352 | /* Returns the debug register capabilities of the target. Should only |
| 353 | be called if the interface is HWDEBUG. */ |
| 354 | const struct ppc_debug_info &hwdebug_info () |
| 355 | { |
| 356 | gdb_assert (hwdebug_p ()); |
| 357 | |
| 358 | return m_hwdebug_info; |
| 359 | } |
| 360 | |
| 361 | /* Returns true if the interface has already been detected. This is |
| 362 | useful for cases when we know there is no work to be done if the |
| 363 | interface hasn't been detected yet. */ |
| 364 | bool detected_p () |
| 365 | { |
| 366 | return m_interface.has_value (); |
| 367 | } |
| 368 | |
| 369 | /* Detect the available interface, if any, if it hasn't been detected |
| 370 | before, using PTID for the necessary ptrace calls. */ |
| 371 | |
| 372 | void detect (const ptid_t &ptid) |
| 373 | { |
| 374 | if (m_interface.has_value ()) |
| 375 | return; |
| 376 | |
| 377 | gdb_assert (ptid.lwp_p ()); |
| 378 | |
| 379 | bool no_features = false; |
| 380 | |
| 381 | if (ptrace (PPC_PTRACE_GETHWDBGINFO, ptid.lwp (), 0, &m_hwdebug_info) |
| 382 | != -1) |
| 383 | { |
| 384 | /* If there are no advertised features, we don't use the |
| 385 | HWDEBUG interface and try the DEBUGREG interface instead. |
| 386 | It shouldn't be necessary to do this, however, when the |
| 387 | kernel is configured without CONFIG_HW_BREAKPOINTS (selected |
| 388 | by CONFIG_PERF_EVENTS), there is a bug that causes |
| 389 | watchpoints installed with the HWDEBUG interface not to |
| 390 | trigger. When this is the case, features will be zero, |
| 391 | which we use as an indicator to fall back to the DEBUGREG |
| 392 | interface. */ |
| 393 | if (m_hwdebug_info.features != 0) |
| 394 | { |
| 395 | m_interface.emplace (HWDEBUG); |
| 396 | return; |
| 397 | } |
| 398 | else |
| 399 | no_features = true; |
| 400 | } |
| 401 | |
| 402 | /* EIO indicates that the request is invalid, so we try DEBUGREG |
| 403 | next. Technically, it can also indicate other failures, but we |
| 404 | can't differentiate those. |
| 405 | |
| 406 | Other errors could happen for various reasons. We could get an |
| 407 | ESRCH if the traced thread was killed by a signal. Trying to |
| 408 | detect the interface with another thread in the future would be |
| 409 | complicated, as callers would have to handle an "unknown |
| 410 | interface" case. It's also unclear if raising an exception |
| 411 | here would be safe. |
| 412 | |
| 413 | Other errors, such as ENODEV, could be more permanent and cause |
| 414 | a failure for any thread. |
| 415 | |
| 416 | For simplicity, with all errors other than EIO, we set the |
| 417 | interface to UNAVAILABLE and don't try DEBUGREG. If DEBUGREG |
| 418 | fails too, we'll also set the interface to UNAVAILABLE. It's |
| 419 | unlikely that trying the DEBUGREG interface with this same thread |
| 420 | would work, for errors other than EIO. This means that these |
| 421 | errors will cause hardware watchpoints and breakpoints to become |
| 422 | unavailable throughout a GDB session. */ |
| 423 | |
| 424 | if (no_features || errno == EIO) |
| 425 | { |
| 426 | unsigned long wp; |
| 427 | |
| 428 | if (ptrace (PTRACE_GET_DEBUGREG, ptid.lwp (), 0, &wp) != -1) |
| 429 | { |
| 430 | m_interface.emplace (DEBUGREG); |
| 431 | return; |
| 432 | } |
| 433 | } |
| 434 | |
| 435 | if (errno != EIO) |
| 436 | warning (_("Error when detecting the debug register interface. " |
| 437 | "Debug registers will be unavailable.")); |
| 438 | |
| 439 | m_interface.emplace (UNAVAILABLE); |
| 440 | return; |
| 441 | } |
| 442 | |
| 443 | private: |
| 444 | |
| 445 | /* HWDEBUG represents the set of calls PPC_PTRACE_GETHWDBGINFO, |
| 446 | PPC_PTRACE_SETHWDEBUG and PPC_PTRACE_DELHWDEBUG. |
| 447 | |
| 448 | DEBUGREG represents the set of calls PTRACE_SET_DEBUGREG and |
| 449 | PTRACE_GET_DEBUGREG. |
| 450 | |
| 451 | UNAVAILABLE can indicate that the kernel doesn't support any of the |
| 452 | two sets of requests or that there was an error when we tried to |
| 453 | detect wich interface is available. */ |
| 454 | |
| 455 | enum debug_reg_interface |
| 456 | { |
| 457 | UNAVAILABLE, |
| 458 | HWDEBUG, |
| 459 | DEBUGREG |
| 460 | }; |
| 461 | |
| 462 | /* The interface option. Initialized if has_value () returns true. */ |
| 463 | gdb::optional<enum debug_reg_interface> m_interface; |
| 464 | |
| 465 | /* The info returned by the kernel with PPC_PTRACE_GETHWDBGINFO. Only |
| 466 | valid if we determined that the interface is HWDEBUG. */ |
| 467 | struct ppc_debug_info m_hwdebug_info; |
| 468 | }; |
| 469 | |
| 470 | /* Per-process information. This includes the hardware watchpoints and |
| 471 | breakpoints that GDB requested to this target. */ |
| 472 | |
| 473 | struct ppc_linux_process_info |
| 474 | { |
| 475 | /* The list of hardware watchpoints and breakpoints that GDB requested |
| 476 | for this process. |
| 477 | |
| 478 | Only used when the interface is HWDEBUG. */ |
| 479 | std::list<struct ppc_hw_breakpoint> requested_hw_bps; |
| 480 | |
| 481 | /* The watchpoint value that GDB requested for this process. |
| 482 | |
| 483 | Only used when the interface is DEBUGREG. */ |
| 484 | gdb::optional<long> requested_wp_val; |
| 485 | }; |
| 486 | |
| 487 | struct ppc_linux_nat_target final : public linux_nat_target |
| 488 | { |
| 489 | /* Add our register access methods. */ |
| 490 | void fetch_registers (struct regcache *, int) override; |
| 491 | void store_registers (struct regcache *, int) override; |
| 492 | |
| 493 | /* Add our breakpoint/watchpoint methods. */ |
| 494 | int can_use_hw_breakpoint (enum bptype, int, int) override; |
| 495 | |
| 496 | int insert_hw_breakpoint (struct gdbarch *, struct bp_target_info *) |
| 497 | override; |
| 498 | |
| 499 | int remove_hw_breakpoint (struct gdbarch *, struct bp_target_info *) |
| 500 | override; |
| 501 | |
| 502 | int region_ok_for_hw_watchpoint (CORE_ADDR, int) override; |
| 503 | |
| 504 | int insert_watchpoint (CORE_ADDR, int, enum target_hw_bp_type, |
| 505 | struct expression *) override; |
| 506 | |
| 507 | int remove_watchpoint (CORE_ADDR, int, enum target_hw_bp_type, |
| 508 | struct expression *) override; |
| 509 | |
| 510 | int insert_mask_watchpoint (CORE_ADDR, CORE_ADDR, enum target_hw_bp_type) |
| 511 | override; |
| 512 | |
| 513 | int remove_mask_watchpoint (CORE_ADDR, CORE_ADDR, enum target_hw_bp_type) |
| 514 | override; |
| 515 | |
| 516 | bool watchpoint_addr_within_range (CORE_ADDR, CORE_ADDR, int) override; |
| 517 | |
| 518 | bool can_accel_watchpoint_condition (CORE_ADDR, int, int, struct expression *) |
| 519 | override; |
| 520 | |
| 521 | int masked_watch_num_registers (CORE_ADDR, CORE_ADDR) override; |
| 522 | |
| 523 | int ranged_break_num_registers () override; |
| 524 | |
| 525 | const struct target_desc *read_description () override; |
| 526 | |
| 527 | int auxv_parse (gdb_byte **readptr, |
| 528 | gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp) |
| 529 | override; |
| 530 | |
| 531 | /* Override linux_nat_target low methods. */ |
| 532 | bool low_stopped_by_watchpoint () override; |
| 533 | |
| 534 | bool low_stopped_data_address (CORE_ADDR *) override; |
| 535 | |
| 536 | void low_new_thread (struct lwp_info *lp) override; |
| 537 | |
| 538 | void low_delete_thread (arch_lwp_info *) override; |
| 539 | |
| 540 | void low_new_fork (struct lwp_info *, pid_t) override; |
| 541 | |
| 542 | void low_new_clone (struct lwp_info *, pid_t) override; |
| 543 | |
| 544 | void low_forget_process (pid_t pid) override; |
| 545 | |
| 546 | void low_prepare_to_resume (struct lwp_info *) override; |
| 547 | |
| 548 | private: |
| 549 | |
| 550 | void copy_thread_dreg_state (const ptid_t &parent_ptid, |
| 551 | const ptid_t &child_ptid); |
| 552 | |
| 553 | void mark_thread_stale (struct lwp_info *lp); |
| 554 | |
| 555 | void mark_debug_registers_changed (pid_t pid); |
| 556 | |
| 557 | void register_hw_breakpoint (pid_t pid, |
| 558 | const struct ppc_hw_breakpoint &bp); |
| 559 | |
| 560 | void clear_hw_breakpoint (pid_t pid, |
| 561 | const struct ppc_hw_breakpoint &a); |
| 562 | |
| 563 | void register_wp (pid_t pid, long wp_value); |
| 564 | |
| 565 | void clear_wp (pid_t pid); |
| 566 | |
| 567 | bool can_use_watchpoint_cond_accel (void); |
| 568 | |
| 569 | void calculate_dvc (CORE_ADDR addr, int len, |
| 570 | CORE_ADDR data_value, |
| 571 | uint32_t *condition_mode, |
| 572 | uint64_t *condition_value); |
| 573 | |
| 574 | int check_condition (CORE_ADDR watch_addr, |
| 575 | struct expression *cond, |
| 576 | CORE_ADDR *data_value, int *len); |
| 577 | |
| 578 | int num_memory_accesses (const std::vector<value_ref_ptr> &chain); |
| 579 | |
| 580 | int get_trigger_type (enum target_hw_bp_type type); |
| 581 | |
| 582 | void create_watchpoint_request (struct ppc_hw_breakpoint *p, |
| 583 | CORE_ADDR addr, |
| 584 | int len, |
| 585 | enum target_hw_bp_type type, |
| 586 | struct expression *cond, |
| 587 | int insert); |
| 588 | |
| 589 | bool hwdebug_point_cmp (const struct ppc_hw_breakpoint &a, |
| 590 | const struct ppc_hw_breakpoint &b); |
| 591 | |
| 592 | void init_arch_lwp_info (struct lwp_info *lp); |
| 593 | |
| 594 | arch_lwp_info *get_arch_lwp_info (struct lwp_info *lp); |
| 595 | |
| 596 | /* The ptrace interface we'll use to install hardware watchpoints and |
| 597 | breakpoints (debug registers). */ |
| 598 | ppc_linux_dreg_interface m_dreg_interface; |
| 599 | |
| 600 | /* A map from pids to structs containing info specific to each |
| 601 | process. */ |
| 602 | std::unordered_map<pid_t, ppc_linux_process_info> m_process_info; |
| 603 | |
| 604 | /* Callable object to hash ptids by their lwp number. */ |
| 605 | struct ptid_hash |
| 606 | { |
| 607 | std::size_t operator() (const ptid_t &ptid) const |
| 608 | { |
| 609 | return std::hash<long>{} (ptid.lwp ()); |
| 610 | } |
| 611 | }; |
| 612 | |
| 613 | /* A map from ptid_t objects to a list of pairs of slots and hardware |
| 614 | breakpoint objects. This keeps track of which hardware breakpoints |
| 615 | and watchpoints were last installed in each slot of each thread. |
| 616 | |
| 617 | Only used when the interface is HWDEBUG. */ |
| 618 | std::unordered_map <ptid_t, |
| 619 | std::list<std::pair<long, ppc_hw_breakpoint>>, |
| 620 | ptid_hash> m_installed_hw_bps; |
| 621 | }; |
| 622 | |
| 623 | static ppc_linux_nat_target the_ppc_linux_nat_target; |
| 624 | |
| 625 | /* *INDENT-OFF* */ |
| 626 | /* registers layout, as presented by the ptrace interface: |
| 627 | PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5, PT_R6, PT_R7, |
| 628 | PT_R8, PT_R9, PT_R10, PT_R11, PT_R12, PT_R13, PT_R14, PT_R15, |
| 629 | PT_R16, PT_R17, PT_R18, PT_R19, PT_R20, PT_R21, PT_R22, PT_R23, |
| 630 | PT_R24, PT_R25, PT_R26, PT_R27, PT_R28, PT_R29, PT_R30, PT_R31, |
| 631 | PT_FPR0, PT_FPR0 + 2, PT_FPR0 + 4, PT_FPR0 + 6, |
| 632 | PT_FPR0 + 8, PT_FPR0 + 10, PT_FPR0 + 12, PT_FPR0 + 14, |
| 633 | PT_FPR0 + 16, PT_FPR0 + 18, PT_FPR0 + 20, PT_FPR0 + 22, |
| 634 | PT_FPR0 + 24, PT_FPR0 + 26, PT_FPR0 + 28, PT_FPR0 + 30, |
| 635 | PT_FPR0 + 32, PT_FPR0 + 34, PT_FPR0 + 36, PT_FPR0 + 38, |
| 636 | PT_FPR0 + 40, PT_FPR0 + 42, PT_FPR0 + 44, PT_FPR0 + 46, |
| 637 | PT_FPR0 + 48, PT_FPR0 + 50, PT_FPR0 + 52, PT_FPR0 + 54, |
| 638 | PT_FPR0 + 56, PT_FPR0 + 58, PT_FPR0 + 60, PT_FPR0 + 62, |
| 639 | PT_NIP, PT_MSR, PT_CCR, PT_LNK, PT_CTR, PT_XER, PT_MQ */ |
| 640 | /* *INDENT_ON * */ |
| 641 | |
| 642 | static int |
| 643 | ppc_register_u_addr (struct gdbarch *gdbarch, int regno) |
| 644 | { |
| 645 | int u_addr = -1; |
| 646 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 647 | /* NOTE: cagney/2003-11-25: This is the word size used by the ptrace |
| 648 | interface, and not the wordsize of the program's ABI. */ |
| 649 | int wordsize = sizeof (long); |
| 650 | |
| 651 | /* General purpose registers occupy 1 slot each in the buffer. */ |
| 652 | if (regno >= tdep->ppc_gp0_regnum |
| 653 | && regno < tdep->ppc_gp0_regnum + ppc_num_gprs) |
| 654 | u_addr = ((regno - tdep->ppc_gp0_regnum + PT_R0) * wordsize); |
| 655 | |
| 656 | /* Floating point regs: eight bytes each in both 32- and 64-bit |
| 657 | ptrace interfaces. Thus, two slots each in 32-bit interface, one |
| 658 | slot each in 64-bit interface. */ |
| 659 | if (tdep->ppc_fp0_regnum >= 0 |
| 660 | && regno >= tdep->ppc_fp0_regnum |
| 661 | && regno < tdep->ppc_fp0_regnum + ppc_num_fprs) |
| 662 | u_addr = (PT_FPR0 * wordsize) + ((regno - tdep->ppc_fp0_regnum) * 8); |
| 663 | |
| 664 | /* UISA special purpose registers: 1 slot each. */ |
| 665 | if (regno == gdbarch_pc_regnum (gdbarch)) |
| 666 | u_addr = PT_NIP * wordsize; |
| 667 | if (regno == tdep->ppc_lr_regnum) |
| 668 | u_addr = PT_LNK * wordsize; |
| 669 | if (regno == tdep->ppc_cr_regnum) |
| 670 | u_addr = PT_CCR * wordsize; |
| 671 | if (regno == tdep->ppc_xer_regnum) |
| 672 | u_addr = PT_XER * wordsize; |
| 673 | if (regno == tdep->ppc_ctr_regnum) |
| 674 | u_addr = PT_CTR * wordsize; |
| 675 | #ifdef PT_MQ |
| 676 | if (regno == tdep->ppc_mq_regnum) |
| 677 | u_addr = PT_MQ * wordsize; |
| 678 | #endif |
| 679 | if (regno == tdep->ppc_ps_regnum) |
| 680 | u_addr = PT_MSR * wordsize; |
| 681 | if (regno == PPC_ORIG_R3_REGNUM) |
| 682 | u_addr = PT_ORIG_R3 * wordsize; |
| 683 | if (regno == PPC_TRAP_REGNUM) |
| 684 | u_addr = PT_TRAP * wordsize; |
| 685 | if (tdep->ppc_fpscr_regnum >= 0 |
| 686 | && regno == tdep->ppc_fpscr_regnum) |
| 687 | { |
| 688 | /* NOTE: cagney/2005-02-08: On some 64-bit GNU/Linux systems the |
| 689 | kernel headers incorrectly contained the 32-bit definition of |
| 690 | PT_FPSCR. For the 32-bit definition, floating-point |
| 691 | registers occupy two 32-bit "slots", and the FPSCR lives in |
| 692 | the second half of such a slot-pair (hence +1). For 64-bit, |
| 693 | the FPSCR instead occupies the full 64-bit 2-word-slot and |
| 694 | hence no adjustment is necessary. Hack around this. */ |
| 695 | if (wordsize == 8 && PT_FPSCR == (48 + 32 + 1)) |
| 696 | u_addr = (48 + 32) * wordsize; |
| 697 | /* If the FPSCR is 64-bit wide, we need to fetch the whole 64-bit |
| 698 | slot and not just its second word. The PT_FPSCR supplied when |
| 699 | GDB is compiled as a 32-bit app doesn't reflect this. */ |
| 700 | else if (wordsize == 4 && register_size (gdbarch, regno) == 8 |
| 701 | && PT_FPSCR == (48 + 2*32 + 1)) |
| 702 | u_addr = (48 + 2*32) * wordsize; |
| 703 | else |
| 704 | u_addr = PT_FPSCR * wordsize; |
| 705 | } |
| 706 | return u_addr; |
| 707 | } |
| 708 | |
| 709 | /* The Linux kernel ptrace interface for POWER7 VSX registers uses the |
| 710 | registers set mechanism, as opposed to the interface for all the |
| 711 | other registers, that stores/fetches each register individually. */ |
| 712 | static void |
| 713 | fetch_vsx_registers (struct regcache *regcache, int tid, int regno) |
| 714 | { |
| 715 | int ret; |
| 716 | gdb_vsxregset_t regs; |
| 717 | const struct regset *vsxregset = ppc_linux_vsxregset (); |
| 718 | |
| 719 | ret = ptrace (PTRACE_GETVSXREGS, tid, 0, ®s); |
| 720 | if (ret < 0) |
| 721 | { |
| 722 | if (errno == EIO) |
| 723 | { |
| 724 | have_ptrace_getsetvsxregs = 0; |
| 725 | return; |
| 726 | } |
| 727 | perror_with_name (_("Unable to fetch VSX registers")); |
| 728 | } |
| 729 | |
| 730 | vsxregset->supply_regset (vsxregset, regcache, regno, ®s, |
| 731 | PPC_LINUX_SIZEOF_VSXREGSET); |
| 732 | } |
| 733 | |
| 734 | /* The Linux kernel ptrace interface for AltiVec registers uses the |
| 735 | registers set mechanism, as opposed to the interface for all the |
| 736 | other registers, that stores/fetches each register individually. */ |
| 737 | static void |
| 738 | fetch_altivec_registers (struct regcache *regcache, int tid, |
| 739 | int regno) |
| 740 | { |
| 741 | int ret; |
| 742 | gdb_vrregset_t regs; |
| 743 | struct gdbarch *gdbarch = regcache->arch (); |
| 744 | const struct regset *vrregset = ppc_linux_vrregset (gdbarch); |
| 745 | |
| 746 | ret = ptrace (PTRACE_GETVRREGS, tid, 0, ®s); |
| 747 | if (ret < 0) |
| 748 | { |
| 749 | if (errno == EIO) |
| 750 | { |
| 751 | have_ptrace_getvrregs = 0; |
| 752 | return; |
| 753 | } |
| 754 | perror_with_name (_("Unable to fetch AltiVec registers")); |
| 755 | } |
| 756 | |
| 757 | vrregset->supply_regset (vrregset, regcache, regno, ®s, |
| 758 | PPC_LINUX_SIZEOF_VRREGSET); |
| 759 | } |
| 760 | |
| 761 | /* Fetch the top 32 bits of TID's general-purpose registers and the |
| 762 | SPE-specific registers, and place the results in EVRREGSET. If we |
| 763 | don't support PTRACE_GETEVRREGS, then just fill EVRREGSET with |
| 764 | zeros. |
| 765 | |
| 766 | All the logic to deal with whether or not the PTRACE_GETEVRREGS and |
| 767 | PTRACE_SETEVRREGS requests are supported is isolated here, and in |
| 768 | set_spe_registers. */ |
| 769 | static void |
| 770 | get_spe_registers (int tid, struct gdb_evrregset_t *evrregset) |
| 771 | { |
| 772 | if (have_ptrace_getsetevrregs) |
| 773 | { |
| 774 | if (ptrace (PTRACE_GETEVRREGS, tid, 0, evrregset) >= 0) |
| 775 | return; |
| 776 | else |
| 777 | { |
| 778 | /* EIO means that the PTRACE_GETEVRREGS request isn't supported; |
| 779 | we just return zeros. */ |
| 780 | if (errno == EIO) |
| 781 | have_ptrace_getsetevrregs = 0; |
| 782 | else |
| 783 | /* Anything else needs to be reported. */ |
| 784 | perror_with_name (_("Unable to fetch SPE registers")); |
| 785 | } |
| 786 | } |
| 787 | |
| 788 | memset (evrregset, 0, sizeof (*evrregset)); |
| 789 | } |
| 790 | |
| 791 | /* Supply values from TID for SPE-specific raw registers: the upper |
| 792 | halves of the GPRs, the accumulator, and the spefscr. REGNO must |
| 793 | be the number of an upper half register, acc, spefscr, or -1 to |
| 794 | supply the values of all registers. */ |
| 795 | static void |
| 796 | fetch_spe_register (struct regcache *regcache, int tid, int regno) |
| 797 | { |
| 798 | struct gdbarch *gdbarch = regcache->arch (); |
| 799 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 800 | struct gdb_evrregset_t evrregs; |
| 801 | |
| 802 | gdb_assert (sizeof (evrregs.evr[0]) |
| 803 | == register_size (gdbarch, tdep->ppc_ev0_upper_regnum)); |
| 804 | gdb_assert (sizeof (evrregs.acc) |
| 805 | == register_size (gdbarch, tdep->ppc_acc_regnum)); |
| 806 | gdb_assert (sizeof (evrregs.spefscr) |
| 807 | == register_size (gdbarch, tdep->ppc_spefscr_regnum)); |
| 808 | |
| 809 | get_spe_registers (tid, &evrregs); |
| 810 | |
| 811 | if (regno == -1) |
| 812 | { |
| 813 | int i; |
| 814 | |
| 815 | for (i = 0; i < ppc_num_gprs; i++) |
| 816 | regcache->raw_supply (tdep->ppc_ev0_upper_regnum + i, &evrregs.evr[i]); |
| 817 | } |
| 818 | else if (tdep->ppc_ev0_upper_regnum <= regno |
| 819 | && regno < tdep->ppc_ev0_upper_regnum + ppc_num_gprs) |
| 820 | regcache->raw_supply (regno, |
| 821 | &evrregs.evr[regno - tdep->ppc_ev0_upper_regnum]); |
| 822 | |
| 823 | if (regno == -1 |
| 824 | || regno == tdep->ppc_acc_regnum) |
| 825 | regcache->raw_supply (tdep->ppc_acc_regnum, &evrregs.acc); |
| 826 | |
| 827 | if (regno == -1 |
| 828 | || regno == tdep->ppc_spefscr_regnum) |
| 829 | regcache->raw_supply (tdep->ppc_spefscr_regnum, &evrregs.spefscr); |
| 830 | } |
| 831 | |
| 832 | /* Use ptrace to fetch all registers from the register set with note |
| 833 | type REGSET_ID, size REGSIZE, and layout described by REGSET, from |
| 834 | process/thread TID and supply their values to REGCACHE. If ptrace |
| 835 | returns ENODATA to indicate the regset is unavailable, mark the |
| 836 | registers as unavailable in REGCACHE. */ |
| 837 | |
| 838 | static void |
| 839 | fetch_regset (struct regcache *regcache, int tid, |
| 840 | int regset_id, int regsetsize, const struct regset *regset) |
| 841 | { |
| 842 | void *buf = alloca (regsetsize); |
| 843 | struct iovec iov; |
| 844 | |
| 845 | iov.iov_base = buf; |
| 846 | iov.iov_len = regsetsize; |
| 847 | |
| 848 | if (ptrace (PTRACE_GETREGSET, tid, regset_id, &iov) < 0) |
| 849 | { |
| 850 | if (errno == ENODATA) |
| 851 | regset->supply_regset (regset, regcache, -1, NULL, regsetsize); |
| 852 | else |
| 853 | perror_with_name (_("Couldn't get register set")); |
| 854 | } |
| 855 | else |
| 856 | regset->supply_regset (regset, regcache, -1, buf, regsetsize); |
| 857 | } |
| 858 | |
| 859 | /* Use ptrace to store register REGNUM of the regset with note type |
| 860 | REGSET_ID, size REGSETSIZE, and layout described by REGSET, from |
| 861 | REGCACHE back to process/thread TID. If REGNUM is -1 all registers |
| 862 | in the set are collected and stored. */ |
| 863 | |
| 864 | static void |
| 865 | store_regset (const struct regcache *regcache, int tid, int regnum, |
| 866 | int regset_id, int regsetsize, const struct regset *regset) |
| 867 | { |
| 868 | void *buf = alloca (regsetsize); |
| 869 | struct iovec iov; |
| 870 | |
| 871 | iov.iov_base = buf; |
| 872 | iov.iov_len = regsetsize; |
| 873 | |
| 874 | /* Make sure that the buffer that will be stored has up to date values |
| 875 | for the registers that won't be collected. */ |
| 876 | if (ptrace (PTRACE_GETREGSET, tid, regset_id, &iov) < 0) |
| 877 | perror_with_name (_("Couldn't get register set")); |
| 878 | |
| 879 | regset->collect_regset (regset, regcache, regnum, buf, regsetsize); |
| 880 | |
| 881 | if (ptrace (PTRACE_SETREGSET, tid, regset_id, &iov) < 0) |
| 882 | perror_with_name (_("Couldn't set register set")); |
| 883 | } |
| 884 | |
| 885 | /* Check whether the kernel provides a register set with number |
| 886 | REGSET_ID of size REGSETSIZE for process/thread TID. */ |
| 887 | |
| 888 | static bool |
| 889 | check_regset (int tid, int regset_id, int regsetsize) |
| 890 | { |
| 891 | void *buf = alloca (regsetsize); |
| 892 | struct iovec iov; |
| 893 | |
| 894 | iov.iov_base = buf; |
| 895 | iov.iov_len = regsetsize; |
| 896 | |
| 897 | if (ptrace (PTRACE_GETREGSET, tid, regset_id, &iov) >= 0 |
| 898 | || errno == ENODATA) |
| 899 | return true; |
| 900 | else |
| 901 | return false; |
| 902 | } |
| 903 | |
| 904 | static void |
| 905 | fetch_register (struct regcache *regcache, int tid, int regno) |
| 906 | { |
| 907 | struct gdbarch *gdbarch = regcache->arch (); |
| 908 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 909 | /* This isn't really an address. But ptrace thinks of it as one. */ |
| 910 | CORE_ADDR regaddr = ppc_register_u_addr (gdbarch, regno); |
| 911 | int bytes_transferred; |
| 912 | gdb_byte buf[PPC_MAX_REGISTER_SIZE]; |
| 913 | |
| 914 | if (altivec_register_p (gdbarch, regno)) |
| 915 | { |
| 916 | /* If this is the first time through, or if it is not the first |
| 917 | time through, and we have confirmed that there is kernel |
| 918 | support for such a ptrace request, then go and fetch the |
| 919 | register. */ |
| 920 | if (have_ptrace_getvrregs) |
| 921 | { |
| 922 | fetch_altivec_registers (regcache, tid, regno); |
| 923 | return; |
| 924 | } |
| 925 | /* If we have discovered that there is no ptrace support for |
| 926 | AltiVec registers, fall through and return zeroes, because |
| 927 | regaddr will be -1 in this case. */ |
| 928 | } |
| 929 | else if (vsx_register_p (gdbarch, regno)) |
| 930 | { |
| 931 | if (have_ptrace_getsetvsxregs) |
| 932 | { |
| 933 | fetch_vsx_registers (regcache, tid, regno); |
| 934 | return; |
| 935 | } |
| 936 | } |
| 937 | else if (spe_register_p (gdbarch, regno)) |
| 938 | { |
| 939 | fetch_spe_register (regcache, tid, regno); |
| 940 | return; |
| 941 | } |
| 942 | else if (regno == PPC_DSCR_REGNUM) |
| 943 | { |
| 944 | gdb_assert (tdep->ppc_dscr_regnum != -1); |
| 945 | |
| 946 | fetch_regset (regcache, tid, NT_PPC_DSCR, |
| 947 | PPC_LINUX_SIZEOF_DSCRREGSET, |
| 948 | &ppc32_linux_dscrregset); |
| 949 | return; |
| 950 | } |
| 951 | else if (regno == PPC_PPR_REGNUM) |
| 952 | { |
| 953 | gdb_assert (tdep->ppc_ppr_regnum != -1); |
| 954 | |
| 955 | fetch_regset (regcache, tid, NT_PPC_PPR, |
| 956 | PPC_LINUX_SIZEOF_PPRREGSET, |
| 957 | &ppc32_linux_pprregset); |
| 958 | return; |
| 959 | } |
| 960 | else if (regno == PPC_TAR_REGNUM) |
| 961 | { |
| 962 | gdb_assert (tdep->ppc_tar_regnum != -1); |
| 963 | |
| 964 | fetch_regset (regcache, tid, NT_PPC_TAR, |
| 965 | PPC_LINUX_SIZEOF_TARREGSET, |
| 966 | &ppc32_linux_tarregset); |
| 967 | return; |
| 968 | } |
| 969 | else if (PPC_IS_EBB_REGNUM (regno)) |
| 970 | { |
| 971 | gdb_assert (tdep->have_ebb); |
| 972 | |
| 973 | fetch_regset (regcache, tid, NT_PPC_EBB, |
| 974 | PPC_LINUX_SIZEOF_EBBREGSET, |
| 975 | &ppc32_linux_ebbregset); |
| 976 | return; |
| 977 | } |
| 978 | else if (PPC_IS_PMU_REGNUM (regno)) |
| 979 | { |
| 980 | gdb_assert (tdep->ppc_mmcr0_regnum != -1); |
| 981 | |
| 982 | fetch_regset (regcache, tid, NT_PPC_PMU, |
| 983 | PPC_LINUX_SIZEOF_PMUREGSET, |
| 984 | &ppc32_linux_pmuregset); |
| 985 | return; |
| 986 | } |
| 987 | else if (PPC_IS_TMSPR_REGNUM (regno)) |
| 988 | { |
| 989 | gdb_assert (tdep->have_htm_spr); |
| 990 | |
| 991 | fetch_regset (regcache, tid, NT_PPC_TM_SPR, |
| 992 | PPC_LINUX_SIZEOF_TM_SPRREGSET, |
| 993 | &ppc32_linux_tm_sprregset); |
| 994 | return; |
| 995 | } |
| 996 | else if (PPC_IS_CKPTGP_REGNUM (regno)) |
| 997 | { |
| 998 | gdb_assert (tdep->have_htm_core); |
| 999 | |
| 1000 | const struct regset *cgprregset = ppc_linux_cgprregset (gdbarch); |
| 1001 | fetch_regset (regcache, tid, NT_PPC_TM_CGPR, |
| 1002 | (tdep->wordsize == 4? |
| 1003 | PPC32_LINUX_SIZEOF_CGPRREGSET |
| 1004 | : PPC64_LINUX_SIZEOF_CGPRREGSET), |
| 1005 | cgprregset); |
| 1006 | return; |
| 1007 | } |
| 1008 | else if (PPC_IS_CKPTFP_REGNUM (regno)) |
| 1009 | { |
| 1010 | gdb_assert (tdep->have_htm_fpu); |
| 1011 | |
| 1012 | fetch_regset (regcache, tid, NT_PPC_TM_CFPR, |
| 1013 | PPC_LINUX_SIZEOF_CFPRREGSET, |
| 1014 | &ppc32_linux_cfprregset); |
| 1015 | return; |
| 1016 | } |
| 1017 | else if (PPC_IS_CKPTVMX_REGNUM (regno)) |
| 1018 | { |
| 1019 | gdb_assert (tdep->have_htm_altivec); |
| 1020 | |
| 1021 | const struct regset *cvmxregset = ppc_linux_cvmxregset (gdbarch); |
| 1022 | fetch_regset (regcache, tid, NT_PPC_TM_CVMX, |
| 1023 | PPC_LINUX_SIZEOF_CVMXREGSET, |
| 1024 | cvmxregset); |
| 1025 | return; |
| 1026 | } |
| 1027 | else if (PPC_IS_CKPTVSX_REGNUM (regno)) |
| 1028 | { |
| 1029 | gdb_assert (tdep->have_htm_vsx); |
| 1030 | |
| 1031 | fetch_regset (regcache, tid, NT_PPC_TM_CVSX, |
| 1032 | PPC_LINUX_SIZEOF_CVSXREGSET, |
| 1033 | &ppc32_linux_cvsxregset); |
| 1034 | return; |
| 1035 | } |
| 1036 | else if (regno == PPC_CPPR_REGNUM) |
| 1037 | { |
| 1038 | gdb_assert (tdep->ppc_cppr_regnum != -1); |
| 1039 | |
| 1040 | fetch_regset (regcache, tid, NT_PPC_TM_CPPR, |
| 1041 | PPC_LINUX_SIZEOF_CPPRREGSET, |
| 1042 | &ppc32_linux_cpprregset); |
| 1043 | return; |
| 1044 | } |
| 1045 | else if (regno == PPC_CDSCR_REGNUM) |
| 1046 | { |
| 1047 | gdb_assert (tdep->ppc_cdscr_regnum != -1); |
| 1048 | |
| 1049 | fetch_regset (regcache, tid, NT_PPC_TM_CDSCR, |
| 1050 | PPC_LINUX_SIZEOF_CDSCRREGSET, |
| 1051 | &ppc32_linux_cdscrregset); |
| 1052 | return; |
| 1053 | } |
| 1054 | else if (regno == PPC_CTAR_REGNUM) |
| 1055 | { |
| 1056 | gdb_assert (tdep->ppc_ctar_regnum != -1); |
| 1057 | |
| 1058 | fetch_regset (regcache, tid, NT_PPC_TM_CTAR, |
| 1059 | PPC_LINUX_SIZEOF_CTARREGSET, |
| 1060 | &ppc32_linux_ctarregset); |
| 1061 | return; |
| 1062 | } |
| 1063 | |
| 1064 | if (regaddr == -1) |
| 1065 | { |
| 1066 | memset (buf, '\0', register_size (gdbarch, regno)); /* Supply zeroes */ |
| 1067 | regcache->raw_supply (regno, buf); |
| 1068 | return; |
| 1069 | } |
| 1070 | |
| 1071 | /* Read the raw register using sizeof(long) sized chunks. On a |
| 1072 | 32-bit platform, 64-bit floating-point registers will require two |
| 1073 | transfers. */ |
| 1074 | for (bytes_transferred = 0; |
| 1075 | bytes_transferred < register_size (gdbarch, regno); |
| 1076 | bytes_transferred += sizeof (long)) |
| 1077 | { |
| 1078 | long l; |
| 1079 | |
| 1080 | errno = 0; |
| 1081 | l = ptrace (PTRACE_PEEKUSER, tid, (PTRACE_TYPE_ARG3) regaddr, 0); |
| 1082 | regaddr += sizeof (long); |
| 1083 | if (errno != 0) |
| 1084 | { |
| 1085 | char message[128]; |
| 1086 | xsnprintf (message, sizeof (message), "reading register %s (#%d)", |
| 1087 | gdbarch_register_name (gdbarch, regno), regno); |
| 1088 | perror_with_name (message); |
| 1089 | } |
| 1090 | memcpy (&buf[bytes_transferred], &l, sizeof (l)); |
| 1091 | } |
| 1092 | |
| 1093 | /* Now supply the register. Keep in mind that the regcache's idea |
| 1094 | of the register's size may not be a multiple of sizeof |
| 1095 | (long). */ |
| 1096 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_LITTLE) |
| 1097 | { |
| 1098 | /* Little-endian values are always found at the left end of the |
| 1099 | bytes transferred. */ |
| 1100 | regcache->raw_supply (regno, buf); |
| 1101 | } |
| 1102 | else if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) |
| 1103 | { |
| 1104 | /* Big-endian values are found at the right end of the bytes |
| 1105 | transferred. */ |
| 1106 | size_t padding = (bytes_transferred - register_size (gdbarch, regno)); |
| 1107 | regcache->raw_supply (regno, buf + padding); |
| 1108 | } |
| 1109 | else |
| 1110 | internal_error (__FILE__, __LINE__, |
| 1111 | _("fetch_register: unexpected byte order: %d"), |
| 1112 | gdbarch_byte_order (gdbarch)); |
| 1113 | } |
| 1114 | |
| 1115 | /* This function actually issues the request to ptrace, telling |
| 1116 | it to get all general-purpose registers and put them into the |
| 1117 | specified regset. |
| 1118 | |
| 1119 | If the ptrace request does not exist, this function returns 0 |
| 1120 | and properly sets the have_ptrace_* flag. If the request fails, |
| 1121 | this function calls perror_with_name. Otherwise, if the request |
| 1122 | succeeds, then the regcache gets filled and 1 is returned. */ |
| 1123 | static int |
| 1124 | fetch_all_gp_regs (struct regcache *regcache, int tid) |
| 1125 | { |
| 1126 | gdb_gregset_t gregset; |
| 1127 | |
| 1128 | if (ptrace (PTRACE_GETREGS, tid, 0, (void *) &gregset) < 0) |
| 1129 | { |
| 1130 | if (errno == EIO) |
| 1131 | { |
| 1132 | have_ptrace_getsetregs = 0; |
| 1133 | return 0; |
| 1134 | } |
| 1135 | perror_with_name (_("Couldn't get general-purpose registers.")); |
| 1136 | } |
| 1137 | |
| 1138 | supply_gregset (regcache, (const gdb_gregset_t *) &gregset); |
| 1139 | |
| 1140 | return 1; |
| 1141 | } |
| 1142 | |
| 1143 | /* This is a wrapper for the fetch_all_gp_regs function. It is |
| 1144 | responsible for verifying if this target has the ptrace request |
| 1145 | that can be used to fetch all general-purpose registers at one |
| 1146 | shot. If it doesn't, then we should fetch them using the |
| 1147 | old-fashioned way, which is to iterate over the registers and |
| 1148 | request them one by one. */ |
| 1149 | static void |
| 1150 | fetch_gp_regs (struct regcache *regcache, int tid) |
| 1151 | { |
| 1152 | struct gdbarch *gdbarch = regcache->arch (); |
| 1153 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 1154 | int i; |
| 1155 | |
| 1156 | if (have_ptrace_getsetregs) |
| 1157 | if (fetch_all_gp_regs (regcache, tid)) |
| 1158 | return; |
| 1159 | |
| 1160 | /* If we've hit this point, it doesn't really matter which |
| 1161 | architecture we are using. We just need to read the |
| 1162 | registers in the "old-fashioned way". */ |
| 1163 | for (i = 0; i < ppc_num_gprs; i++) |
| 1164 | fetch_register (regcache, tid, tdep->ppc_gp0_regnum + i); |
| 1165 | } |
| 1166 | |
| 1167 | /* This function actually issues the request to ptrace, telling |
| 1168 | it to get all floating-point registers and put them into the |
| 1169 | specified regset. |
| 1170 | |
| 1171 | If the ptrace request does not exist, this function returns 0 |
| 1172 | and properly sets the have_ptrace_* flag. If the request fails, |
| 1173 | this function calls perror_with_name. Otherwise, if the request |
| 1174 | succeeds, then the regcache gets filled and 1 is returned. */ |
| 1175 | static int |
| 1176 | fetch_all_fp_regs (struct regcache *regcache, int tid) |
| 1177 | { |
| 1178 | gdb_fpregset_t fpregs; |
| 1179 | |
| 1180 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (void *) &fpregs) < 0) |
| 1181 | { |
| 1182 | if (errno == EIO) |
| 1183 | { |
| 1184 | have_ptrace_getsetfpregs = 0; |
| 1185 | return 0; |
| 1186 | } |
| 1187 | perror_with_name (_("Couldn't get floating-point registers.")); |
| 1188 | } |
| 1189 | |
| 1190 | supply_fpregset (regcache, (const gdb_fpregset_t *) &fpregs); |
| 1191 | |
| 1192 | return 1; |
| 1193 | } |
| 1194 | |
| 1195 | /* This is a wrapper for the fetch_all_fp_regs function. It is |
| 1196 | responsible for verifying if this target has the ptrace request |
| 1197 | that can be used to fetch all floating-point registers at one |
| 1198 | shot. If it doesn't, then we should fetch them using the |
| 1199 | old-fashioned way, which is to iterate over the registers and |
| 1200 | request them one by one. */ |
| 1201 | static void |
| 1202 | fetch_fp_regs (struct regcache *regcache, int tid) |
| 1203 | { |
| 1204 | struct gdbarch *gdbarch = regcache->arch (); |
| 1205 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 1206 | int i; |
| 1207 | |
| 1208 | if (have_ptrace_getsetfpregs) |
| 1209 | if (fetch_all_fp_regs (regcache, tid)) |
| 1210 | return; |
| 1211 | |
| 1212 | /* If we've hit this point, it doesn't really matter which |
| 1213 | architecture we are using. We just need to read the |
| 1214 | registers in the "old-fashioned way". */ |
| 1215 | for (i = 0; i < ppc_num_fprs; i++) |
| 1216 | fetch_register (regcache, tid, tdep->ppc_fp0_regnum + i); |
| 1217 | } |
| 1218 | |
| 1219 | static void |
| 1220 | fetch_ppc_registers (struct regcache *regcache, int tid) |
| 1221 | { |
| 1222 | struct gdbarch *gdbarch = regcache->arch (); |
| 1223 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 1224 | |
| 1225 | fetch_gp_regs (regcache, tid); |
| 1226 | if (tdep->ppc_fp0_regnum >= 0) |
| 1227 | fetch_fp_regs (regcache, tid); |
| 1228 | fetch_register (regcache, tid, gdbarch_pc_regnum (gdbarch)); |
| 1229 | if (tdep->ppc_ps_regnum != -1) |
| 1230 | fetch_register (regcache, tid, tdep->ppc_ps_regnum); |
| 1231 | if (tdep->ppc_cr_regnum != -1) |
| 1232 | fetch_register (regcache, tid, tdep->ppc_cr_regnum); |
| 1233 | if (tdep->ppc_lr_regnum != -1) |
| 1234 | fetch_register (regcache, tid, tdep->ppc_lr_regnum); |
| 1235 | if (tdep->ppc_ctr_regnum != -1) |
| 1236 | fetch_register (regcache, tid, tdep->ppc_ctr_regnum); |
| 1237 | if (tdep->ppc_xer_regnum != -1) |
| 1238 | fetch_register (regcache, tid, tdep->ppc_xer_regnum); |
| 1239 | if (tdep->ppc_mq_regnum != -1) |
| 1240 | fetch_register (regcache, tid, tdep->ppc_mq_regnum); |
| 1241 | if (ppc_linux_trap_reg_p (gdbarch)) |
| 1242 | { |
| 1243 | fetch_register (regcache, tid, PPC_ORIG_R3_REGNUM); |
| 1244 | fetch_register (regcache, tid, PPC_TRAP_REGNUM); |
| 1245 | } |
| 1246 | if (tdep->ppc_fpscr_regnum != -1) |
| 1247 | fetch_register (regcache, tid, tdep->ppc_fpscr_regnum); |
| 1248 | if (have_ptrace_getvrregs) |
| 1249 | if (tdep->ppc_vr0_regnum != -1 && tdep->ppc_vrsave_regnum != -1) |
| 1250 | fetch_altivec_registers (regcache, tid, -1); |
| 1251 | if (have_ptrace_getsetvsxregs) |
| 1252 | if (tdep->ppc_vsr0_upper_regnum != -1) |
| 1253 | fetch_vsx_registers (regcache, tid, -1); |
| 1254 | if (tdep->ppc_ev0_upper_regnum >= 0) |
| 1255 | fetch_spe_register (regcache, tid, -1); |
| 1256 | if (tdep->ppc_ppr_regnum != -1) |
| 1257 | fetch_regset (regcache, tid, NT_PPC_PPR, |
| 1258 | PPC_LINUX_SIZEOF_PPRREGSET, |
| 1259 | &ppc32_linux_pprregset); |
| 1260 | if (tdep->ppc_dscr_regnum != -1) |
| 1261 | fetch_regset (regcache, tid, NT_PPC_DSCR, |
| 1262 | PPC_LINUX_SIZEOF_DSCRREGSET, |
| 1263 | &ppc32_linux_dscrregset); |
| 1264 | if (tdep->ppc_tar_regnum != -1) |
| 1265 | fetch_regset (regcache, tid, NT_PPC_TAR, |
| 1266 | PPC_LINUX_SIZEOF_TARREGSET, |
| 1267 | &ppc32_linux_tarregset); |
| 1268 | if (tdep->have_ebb) |
| 1269 | fetch_regset (regcache, tid, NT_PPC_EBB, |
| 1270 | PPC_LINUX_SIZEOF_EBBREGSET, |
| 1271 | &ppc32_linux_ebbregset); |
| 1272 | if (tdep->ppc_mmcr0_regnum != -1) |
| 1273 | fetch_regset (regcache, tid, NT_PPC_PMU, |
| 1274 | PPC_LINUX_SIZEOF_PMUREGSET, |
| 1275 | &ppc32_linux_pmuregset); |
| 1276 | if (tdep->have_htm_spr) |
| 1277 | fetch_regset (regcache, tid, NT_PPC_TM_SPR, |
| 1278 | PPC_LINUX_SIZEOF_TM_SPRREGSET, |
| 1279 | &ppc32_linux_tm_sprregset); |
| 1280 | if (tdep->have_htm_core) |
| 1281 | { |
| 1282 | const struct regset *cgprregset = ppc_linux_cgprregset (gdbarch); |
| 1283 | fetch_regset (regcache, tid, NT_PPC_TM_CGPR, |
| 1284 | (tdep->wordsize == 4? |
| 1285 | PPC32_LINUX_SIZEOF_CGPRREGSET |
| 1286 | : PPC64_LINUX_SIZEOF_CGPRREGSET), |
| 1287 | cgprregset); |
| 1288 | } |
| 1289 | if (tdep->have_htm_fpu) |
| 1290 | fetch_regset (regcache, tid, NT_PPC_TM_CFPR, |
| 1291 | PPC_LINUX_SIZEOF_CFPRREGSET, |
| 1292 | &ppc32_linux_cfprregset); |
| 1293 | if (tdep->have_htm_altivec) |
| 1294 | { |
| 1295 | const struct regset *cvmxregset = ppc_linux_cvmxregset (gdbarch); |
| 1296 | fetch_regset (regcache, tid, NT_PPC_TM_CVMX, |
| 1297 | PPC_LINUX_SIZEOF_CVMXREGSET, |
| 1298 | cvmxregset); |
| 1299 | } |
| 1300 | if (tdep->have_htm_vsx) |
| 1301 | fetch_regset (regcache, tid, NT_PPC_TM_CVSX, |
| 1302 | PPC_LINUX_SIZEOF_CVSXREGSET, |
| 1303 | &ppc32_linux_cvsxregset); |
| 1304 | if (tdep->ppc_cppr_regnum != -1) |
| 1305 | fetch_regset (regcache, tid, NT_PPC_TM_CPPR, |
| 1306 | PPC_LINUX_SIZEOF_CPPRREGSET, |
| 1307 | &ppc32_linux_cpprregset); |
| 1308 | if (tdep->ppc_cdscr_regnum != -1) |
| 1309 | fetch_regset (regcache, tid, NT_PPC_TM_CDSCR, |
| 1310 | PPC_LINUX_SIZEOF_CDSCRREGSET, |
| 1311 | &ppc32_linux_cdscrregset); |
| 1312 | if (tdep->ppc_ctar_regnum != -1) |
| 1313 | fetch_regset (regcache, tid, NT_PPC_TM_CTAR, |
| 1314 | PPC_LINUX_SIZEOF_CTARREGSET, |
| 1315 | &ppc32_linux_ctarregset); |
| 1316 | } |
| 1317 | |
| 1318 | /* Fetch registers from the child process. Fetch all registers if |
| 1319 | regno == -1, otherwise fetch all general registers or all floating |
| 1320 | point registers depending upon the value of regno. */ |
| 1321 | void |
| 1322 | ppc_linux_nat_target::fetch_registers (struct regcache *regcache, int regno) |
| 1323 | { |
| 1324 | pid_t tid = get_ptrace_pid (regcache->ptid ()); |
| 1325 | |
| 1326 | if (regno == -1) |
| 1327 | fetch_ppc_registers (regcache, tid); |
| 1328 | else |
| 1329 | fetch_register (regcache, tid, regno); |
| 1330 | } |
| 1331 | |
| 1332 | static void |
| 1333 | store_vsx_registers (const struct regcache *regcache, int tid, int regno) |
| 1334 | { |
| 1335 | int ret; |
| 1336 | gdb_vsxregset_t regs; |
| 1337 | const struct regset *vsxregset = ppc_linux_vsxregset (); |
| 1338 | |
| 1339 | ret = ptrace (PTRACE_GETVSXREGS, tid, 0, ®s); |
| 1340 | if (ret < 0) |
| 1341 | { |
| 1342 | if (errno == EIO) |
| 1343 | { |
| 1344 | have_ptrace_getsetvsxregs = 0; |
| 1345 | return; |
| 1346 | } |
| 1347 | perror_with_name (_("Unable to fetch VSX registers")); |
| 1348 | } |
| 1349 | |
| 1350 | vsxregset->collect_regset (vsxregset, regcache, regno, ®s, |
| 1351 | PPC_LINUX_SIZEOF_VSXREGSET); |
| 1352 | |
| 1353 | ret = ptrace (PTRACE_SETVSXREGS, tid, 0, ®s); |
| 1354 | if (ret < 0) |
| 1355 | perror_with_name (_("Unable to store VSX registers")); |
| 1356 | } |
| 1357 | |
| 1358 | static void |
| 1359 | store_altivec_registers (const struct regcache *regcache, int tid, |
| 1360 | int regno) |
| 1361 | { |
| 1362 | int ret; |
| 1363 | gdb_vrregset_t regs; |
| 1364 | struct gdbarch *gdbarch = regcache->arch (); |
| 1365 | const struct regset *vrregset = ppc_linux_vrregset (gdbarch); |
| 1366 | |
| 1367 | ret = ptrace (PTRACE_GETVRREGS, tid, 0, ®s); |
| 1368 | if (ret < 0) |
| 1369 | { |
| 1370 | if (errno == EIO) |
| 1371 | { |
| 1372 | have_ptrace_getvrregs = 0; |
| 1373 | return; |
| 1374 | } |
| 1375 | perror_with_name (_("Unable to fetch AltiVec registers")); |
| 1376 | } |
| 1377 | |
| 1378 | vrregset->collect_regset (vrregset, regcache, regno, ®s, |
| 1379 | PPC_LINUX_SIZEOF_VRREGSET); |
| 1380 | |
| 1381 | ret = ptrace (PTRACE_SETVRREGS, tid, 0, ®s); |
| 1382 | if (ret < 0) |
| 1383 | perror_with_name (_("Unable to store AltiVec registers")); |
| 1384 | } |
| 1385 | |
| 1386 | /* Assuming TID refers to an SPE process, set the top halves of TID's |
| 1387 | general-purpose registers and its SPE-specific registers to the |
| 1388 | values in EVRREGSET. If we don't support PTRACE_SETEVRREGS, do |
| 1389 | nothing. |
| 1390 | |
| 1391 | All the logic to deal with whether or not the PTRACE_GETEVRREGS and |
| 1392 | PTRACE_SETEVRREGS requests are supported is isolated here, and in |
| 1393 | get_spe_registers. */ |
| 1394 | static void |
| 1395 | set_spe_registers (int tid, struct gdb_evrregset_t *evrregset) |
| 1396 | { |
| 1397 | if (have_ptrace_getsetevrregs) |
| 1398 | { |
| 1399 | if (ptrace (PTRACE_SETEVRREGS, tid, 0, evrregset) >= 0) |
| 1400 | return; |
| 1401 | else |
| 1402 | { |
| 1403 | /* EIO means that the PTRACE_SETEVRREGS request isn't |
| 1404 | supported; we fail silently, and don't try the call |
| 1405 | again. */ |
| 1406 | if (errno == EIO) |
| 1407 | have_ptrace_getsetevrregs = 0; |
| 1408 | else |
| 1409 | /* Anything else needs to be reported. */ |
| 1410 | perror_with_name (_("Unable to set SPE registers")); |
| 1411 | } |
| 1412 | } |
| 1413 | } |
| 1414 | |
| 1415 | /* Write GDB's value for the SPE-specific raw register REGNO to TID. |
| 1416 | If REGNO is -1, write the values of all the SPE-specific |
| 1417 | registers. */ |
| 1418 | static void |
| 1419 | store_spe_register (const struct regcache *regcache, int tid, int regno) |
| 1420 | { |
| 1421 | struct gdbarch *gdbarch = regcache->arch (); |
| 1422 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 1423 | struct gdb_evrregset_t evrregs; |
| 1424 | |
| 1425 | gdb_assert (sizeof (evrregs.evr[0]) |
| 1426 | == register_size (gdbarch, tdep->ppc_ev0_upper_regnum)); |
| 1427 | gdb_assert (sizeof (evrregs.acc) |
| 1428 | == register_size (gdbarch, tdep->ppc_acc_regnum)); |
| 1429 | gdb_assert (sizeof (evrregs.spefscr) |
| 1430 | == register_size (gdbarch, tdep->ppc_spefscr_regnum)); |
| 1431 | |
| 1432 | if (regno == -1) |
| 1433 | /* Since we're going to write out every register, the code below |
| 1434 | should store to every field of evrregs; if that doesn't happen, |
| 1435 | make it obvious by initializing it with suspicious values. */ |
| 1436 | memset (&evrregs, 42, sizeof (evrregs)); |
| 1437 | else |
| 1438 | /* We can only read and write the entire EVR register set at a |
| 1439 | time, so to write just a single register, we do a |
| 1440 | read-modify-write maneuver. */ |
| 1441 | get_spe_registers (tid, &evrregs); |
| 1442 | |
| 1443 | if (regno == -1) |
| 1444 | { |
| 1445 | int i; |
| 1446 | |
| 1447 | for (i = 0; i < ppc_num_gprs; i++) |
| 1448 | regcache->raw_collect (tdep->ppc_ev0_upper_regnum + i, |
| 1449 | &evrregs.evr[i]); |
| 1450 | } |
| 1451 | else if (tdep->ppc_ev0_upper_regnum <= regno |
| 1452 | && regno < tdep->ppc_ev0_upper_regnum + ppc_num_gprs) |
| 1453 | regcache->raw_collect (regno, |
| 1454 | &evrregs.evr[regno - tdep->ppc_ev0_upper_regnum]); |
| 1455 | |
| 1456 | if (regno == -1 |
| 1457 | || regno == tdep->ppc_acc_regnum) |
| 1458 | regcache->raw_collect (tdep->ppc_acc_regnum, |
| 1459 | &evrregs.acc); |
| 1460 | |
| 1461 | if (regno == -1 |
| 1462 | || regno == tdep->ppc_spefscr_regnum) |
| 1463 | regcache->raw_collect (tdep->ppc_spefscr_regnum, |
| 1464 | &evrregs.spefscr); |
| 1465 | |
| 1466 | /* Write back the modified register set. */ |
| 1467 | set_spe_registers (tid, &evrregs); |
| 1468 | } |
| 1469 | |
| 1470 | static void |
| 1471 | store_register (const struct regcache *regcache, int tid, int regno) |
| 1472 | { |
| 1473 | struct gdbarch *gdbarch = regcache->arch (); |
| 1474 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 1475 | /* This isn't really an address. But ptrace thinks of it as one. */ |
| 1476 | CORE_ADDR regaddr = ppc_register_u_addr (gdbarch, regno); |
| 1477 | int i; |
| 1478 | size_t bytes_to_transfer; |
| 1479 | gdb_byte buf[PPC_MAX_REGISTER_SIZE]; |
| 1480 | |
| 1481 | if (altivec_register_p (gdbarch, regno)) |
| 1482 | { |
| 1483 | store_altivec_registers (regcache, tid, regno); |
| 1484 | return; |
| 1485 | } |
| 1486 | else if (vsx_register_p (gdbarch, regno)) |
| 1487 | { |
| 1488 | store_vsx_registers (regcache, tid, regno); |
| 1489 | return; |
| 1490 | } |
| 1491 | else if (spe_register_p (gdbarch, regno)) |
| 1492 | { |
| 1493 | store_spe_register (regcache, tid, regno); |
| 1494 | return; |
| 1495 | } |
| 1496 | else if (regno == PPC_DSCR_REGNUM) |
| 1497 | { |
| 1498 | gdb_assert (tdep->ppc_dscr_regnum != -1); |
| 1499 | |
| 1500 | store_regset (regcache, tid, regno, NT_PPC_DSCR, |
| 1501 | PPC_LINUX_SIZEOF_DSCRREGSET, |
| 1502 | &ppc32_linux_dscrregset); |
| 1503 | return; |
| 1504 | } |
| 1505 | else if (regno == PPC_PPR_REGNUM) |
| 1506 | { |
| 1507 | gdb_assert (tdep->ppc_ppr_regnum != -1); |
| 1508 | |
| 1509 | store_regset (regcache, tid, regno, NT_PPC_PPR, |
| 1510 | PPC_LINUX_SIZEOF_PPRREGSET, |
| 1511 | &ppc32_linux_pprregset); |
| 1512 | return; |
| 1513 | } |
| 1514 | else if (regno == PPC_TAR_REGNUM) |
| 1515 | { |
| 1516 | gdb_assert (tdep->ppc_tar_regnum != -1); |
| 1517 | |
| 1518 | store_regset (regcache, tid, regno, NT_PPC_TAR, |
| 1519 | PPC_LINUX_SIZEOF_TARREGSET, |
| 1520 | &ppc32_linux_tarregset); |
| 1521 | return; |
| 1522 | } |
| 1523 | else if (PPC_IS_EBB_REGNUM (regno)) |
| 1524 | { |
| 1525 | gdb_assert (tdep->have_ebb); |
| 1526 | |
| 1527 | store_regset (regcache, tid, regno, NT_PPC_EBB, |
| 1528 | PPC_LINUX_SIZEOF_EBBREGSET, |
| 1529 | &ppc32_linux_ebbregset); |
| 1530 | return; |
| 1531 | } |
| 1532 | else if (PPC_IS_PMU_REGNUM (regno)) |
| 1533 | { |
| 1534 | gdb_assert (tdep->ppc_mmcr0_regnum != -1); |
| 1535 | |
| 1536 | store_regset (regcache, tid, regno, NT_PPC_PMU, |
| 1537 | PPC_LINUX_SIZEOF_PMUREGSET, |
| 1538 | &ppc32_linux_pmuregset); |
| 1539 | return; |
| 1540 | } |
| 1541 | else if (PPC_IS_TMSPR_REGNUM (regno)) |
| 1542 | { |
| 1543 | gdb_assert (tdep->have_htm_spr); |
| 1544 | |
| 1545 | store_regset (regcache, tid, regno, NT_PPC_TM_SPR, |
| 1546 | PPC_LINUX_SIZEOF_TM_SPRREGSET, |
| 1547 | &ppc32_linux_tm_sprregset); |
| 1548 | return; |
| 1549 | } |
| 1550 | else if (PPC_IS_CKPTGP_REGNUM (regno)) |
| 1551 | { |
| 1552 | gdb_assert (tdep->have_htm_core); |
| 1553 | |
| 1554 | const struct regset *cgprregset = ppc_linux_cgprregset (gdbarch); |
| 1555 | store_regset (regcache, tid, regno, NT_PPC_TM_CGPR, |
| 1556 | (tdep->wordsize == 4? |
| 1557 | PPC32_LINUX_SIZEOF_CGPRREGSET |
| 1558 | : PPC64_LINUX_SIZEOF_CGPRREGSET), |
| 1559 | cgprregset); |
| 1560 | return; |
| 1561 | } |
| 1562 | else if (PPC_IS_CKPTFP_REGNUM (regno)) |
| 1563 | { |
| 1564 | gdb_assert (tdep->have_htm_fpu); |
| 1565 | |
| 1566 | store_regset (regcache, tid, regno, NT_PPC_TM_CFPR, |
| 1567 | PPC_LINUX_SIZEOF_CFPRREGSET, |
| 1568 | &ppc32_linux_cfprregset); |
| 1569 | return; |
| 1570 | } |
| 1571 | else if (PPC_IS_CKPTVMX_REGNUM (regno)) |
| 1572 | { |
| 1573 | gdb_assert (tdep->have_htm_altivec); |
| 1574 | |
| 1575 | const struct regset *cvmxregset = ppc_linux_cvmxregset (gdbarch); |
| 1576 | store_regset (regcache, tid, regno, NT_PPC_TM_CVMX, |
| 1577 | PPC_LINUX_SIZEOF_CVMXREGSET, |
| 1578 | cvmxregset); |
| 1579 | return; |
| 1580 | } |
| 1581 | else if (PPC_IS_CKPTVSX_REGNUM (regno)) |
| 1582 | { |
| 1583 | gdb_assert (tdep->have_htm_vsx); |
| 1584 | |
| 1585 | store_regset (regcache, tid, regno, NT_PPC_TM_CVSX, |
| 1586 | PPC_LINUX_SIZEOF_CVSXREGSET, |
| 1587 | &ppc32_linux_cvsxregset); |
| 1588 | return; |
| 1589 | } |
| 1590 | else if (regno == PPC_CPPR_REGNUM) |
| 1591 | { |
| 1592 | gdb_assert (tdep->ppc_cppr_regnum != -1); |
| 1593 | |
| 1594 | store_regset (regcache, tid, regno, NT_PPC_TM_CPPR, |
| 1595 | PPC_LINUX_SIZEOF_CPPRREGSET, |
| 1596 | &ppc32_linux_cpprregset); |
| 1597 | return; |
| 1598 | } |
| 1599 | else if (regno == PPC_CDSCR_REGNUM) |
| 1600 | { |
| 1601 | gdb_assert (tdep->ppc_cdscr_regnum != -1); |
| 1602 | |
| 1603 | store_regset (regcache, tid, regno, NT_PPC_TM_CDSCR, |
| 1604 | PPC_LINUX_SIZEOF_CDSCRREGSET, |
| 1605 | &ppc32_linux_cdscrregset); |
| 1606 | return; |
| 1607 | } |
| 1608 | else if (regno == PPC_CTAR_REGNUM) |
| 1609 | { |
| 1610 | gdb_assert (tdep->ppc_ctar_regnum != -1); |
| 1611 | |
| 1612 | store_regset (regcache, tid, regno, NT_PPC_TM_CTAR, |
| 1613 | PPC_LINUX_SIZEOF_CTARREGSET, |
| 1614 | &ppc32_linux_ctarregset); |
| 1615 | return; |
| 1616 | } |
| 1617 | |
| 1618 | if (regaddr == -1) |
| 1619 | return; |
| 1620 | |
| 1621 | /* First collect the register. Keep in mind that the regcache's |
| 1622 | idea of the register's size may not be a multiple of sizeof |
| 1623 | (long). */ |
| 1624 | memset (buf, 0, sizeof buf); |
| 1625 | bytes_to_transfer = align_up (register_size (gdbarch, regno), sizeof (long)); |
| 1626 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_LITTLE) |
| 1627 | { |
| 1628 | /* Little-endian values always sit at the left end of the buffer. */ |
| 1629 | regcache->raw_collect (regno, buf); |
| 1630 | } |
| 1631 | else if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_BIG) |
| 1632 | { |
| 1633 | /* Big-endian values sit at the right end of the buffer. */ |
| 1634 | size_t padding = (bytes_to_transfer - register_size (gdbarch, regno)); |
| 1635 | regcache->raw_collect (regno, buf + padding); |
| 1636 | } |
| 1637 | |
| 1638 | for (i = 0; i < bytes_to_transfer; i += sizeof (long)) |
| 1639 | { |
| 1640 | long l; |
| 1641 | |
| 1642 | memcpy (&l, &buf[i], sizeof (l)); |
| 1643 | errno = 0; |
| 1644 | ptrace (PTRACE_POKEUSER, tid, (PTRACE_TYPE_ARG3) regaddr, l); |
| 1645 | regaddr += sizeof (long); |
| 1646 | |
| 1647 | if (errno == EIO |
| 1648 | && (regno == tdep->ppc_fpscr_regnum |
| 1649 | || regno == PPC_ORIG_R3_REGNUM |
| 1650 | || regno == PPC_TRAP_REGNUM)) |
| 1651 | { |
| 1652 | /* Some older kernel versions don't allow fpscr, orig_r3 |
| 1653 | or trap to be written. */ |
| 1654 | continue; |
| 1655 | } |
| 1656 | |
| 1657 | if (errno != 0) |
| 1658 | { |
| 1659 | char message[128]; |
| 1660 | xsnprintf (message, sizeof (message), "writing register %s (#%d)", |
| 1661 | gdbarch_register_name (gdbarch, regno), regno); |
| 1662 | perror_with_name (message); |
| 1663 | } |
| 1664 | } |
| 1665 | } |
| 1666 | |
| 1667 | /* This function actually issues the request to ptrace, telling |
| 1668 | it to store all general-purpose registers present in the specified |
| 1669 | regset. |
| 1670 | |
| 1671 | If the ptrace request does not exist, this function returns 0 |
| 1672 | and properly sets the have_ptrace_* flag. If the request fails, |
| 1673 | this function calls perror_with_name. Otherwise, if the request |
| 1674 | succeeds, then the regcache is stored and 1 is returned. */ |
| 1675 | static int |
| 1676 | store_all_gp_regs (const struct regcache *regcache, int tid, int regno) |
| 1677 | { |
| 1678 | gdb_gregset_t gregset; |
| 1679 | |
| 1680 | if (ptrace (PTRACE_GETREGS, tid, 0, (void *) &gregset) < 0) |
| 1681 | { |
| 1682 | if (errno == EIO) |
| 1683 | { |
| 1684 | have_ptrace_getsetregs = 0; |
| 1685 | return 0; |
| 1686 | } |
| 1687 | perror_with_name (_("Couldn't get general-purpose registers.")); |
| 1688 | } |
| 1689 | |
| 1690 | fill_gregset (regcache, &gregset, regno); |
| 1691 | |
| 1692 | if (ptrace (PTRACE_SETREGS, tid, 0, (void *) &gregset) < 0) |
| 1693 | { |
| 1694 | if (errno == EIO) |
| 1695 | { |
| 1696 | have_ptrace_getsetregs = 0; |
| 1697 | return 0; |
| 1698 | } |
| 1699 | perror_with_name (_("Couldn't set general-purpose registers.")); |
| 1700 | } |
| 1701 | |
| 1702 | return 1; |
| 1703 | } |
| 1704 | |
| 1705 | /* This is a wrapper for the store_all_gp_regs function. It is |
| 1706 | responsible for verifying if this target has the ptrace request |
| 1707 | that can be used to store all general-purpose registers at one |
| 1708 | shot. If it doesn't, then we should store them using the |
| 1709 | old-fashioned way, which is to iterate over the registers and |
| 1710 | store them one by one. */ |
| 1711 | static void |
| 1712 | store_gp_regs (const struct regcache *regcache, int tid, int regno) |
| 1713 | { |
| 1714 | struct gdbarch *gdbarch = regcache->arch (); |
| 1715 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 1716 | int i; |
| 1717 | |
| 1718 | if (have_ptrace_getsetregs) |
| 1719 | if (store_all_gp_regs (regcache, tid, regno)) |
| 1720 | return; |
| 1721 | |
| 1722 | /* If we hit this point, it doesn't really matter which |
| 1723 | architecture we are using. We just need to store the |
| 1724 | registers in the "old-fashioned way". */ |
| 1725 | for (i = 0; i < ppc_num_gprs; i++) |
| 1726 | store_register (regcache, tid, tdep->ppc_gp0_regnum + i); |
| 1727 | } |
| 1728 | |
| 1729 | /* This function actually issues the request to ptrace, telling |
| 1730 | it to store all floating-point registers present in the specified |
| 1731 | regset. |
| 1732 | |
| 1733 | If the ptrace request does not exist, this function returns 0 |
| 1734 | and properly sets the have_ptrace_* flag. If the request fails, |
| 1735 | this function calls perror_with_name. Otherwise, if the request |
| 1736 | succeeds, then the regcache is stored and 1 is returned. */ |
| 1737 | static int |
| 1738 | store_all_fp_regs (const struct regcache *regcache, int tid, int regno) |
| 1739 | { |
| 1740 | gdb_fpregset_t fpregs; |
| 1741 | |
| 1742 | if (ptrace (PTRACE_GETFPREGS, tid, 0, (void *) &fpregs) < 0) |
| 1743 | { |
| 1744 | if (errno == EIO) |
| 1745 | { |
| 1746 | have_ptrace_getsetfpregs = 0; |
| 1747 | return 0; |
| 1748 | } |
| 1749 | perror_with_name (_("Couldn't get floating-point registers.")); |
| 1750 | } |
| 1751 | |
| 1752 | fill_fpregset (regcache, &fpregs, regno); |
| 1753 | |
| 1754 | if (ptrace (PTRACE_SETFPREGS, tid, 0, (void *) &fpregs) < 0) |
| 1755 | { |
| 1756 | if (errno == EIO) |
| 1757 | { |
| 1758 | have_ptrace_getsetfpregs = 0; |
| 1759 | return 0; |
| 1760 | } |
| 1761 | perror_with_name (_("Couldn't set floating-point registers.")); |
| 1762 | } |
| 1763 | |
| 1764 | return 1; |
| 1765 | } |
| 1766 | |
| 1767 | /* This is a wrapper for the store_all_fp_regs function. It is |
| 1768 | responsible for verifying if this target has the ptrace request |
| 1769 | that can be used to store all floating-point registers at one |
| 1770 | shot. If it doesn't, then we should store them using the |
| 1771 | old-fashioned way, which is to iterate over the registers and |
| 1772 | store them one by one. */ |
| 1773 | static void |
| 1774 | store_fp_regs (const struct regcache *regcache, int tid, int regno) |
| 1775 | { |
| 1776 | struct gdbarch *gdbarch = regcache->arch (); |
| 1777 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 1778 | int i; |
| 1779 | |
| 1780 | if (have_ptrace_getsetfpregs) |
| 1781 | if (store_all_fp_regs (regcache, tid, regno)) |
| 1782 | return; |
| 1783 | |
| 1784 | /* If we hit this point, it doesn't really matter which |
| 1785 | architecture we are using. We just need to store the |
| 1786 | registers in the "old-fashioned way". */ |
| 1787 | for (i = 0; i < ppc_num_fprs; i++) |
| 1788 | store_register (regcache, tid, tdep->ppc_fp0_regnum + i); |
| 1789 | } |
| 1790 | |
| 1791 | static void |
| 1792 | store_ppc_registers (const struct regcache *regcache, int tid) |
| 1793 | { |
| 1794 | struct gdbarch *gdbarch = regcache->arch (); |
| 1795 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| 1796 | |
| 1797 | store_gp_regs (regcache, tid, -1); |
| 1798 | if (tdep->ppc_fp0_regnum >= 0) |
| 1799 | store_fp_regs (regcache, tid, -1); |
| 1800 | store_register (regcache, tid, gdbarch_pc_regnum (gdbarch)); |
| 1801 | if (tdep->ppc_ps_regnum != -1) |
| 1802 | store_register (regcache, tid, tdep->ppc_ps_regnum); |
| 1803 | if (tdep->ppc_cr_regnum != -1) |
| 1804 | store_register (regcache, tid, tdep->ppc_cr_regnum); |
| 1805 | if (tdep->ppc_lr_regnum != -1) |
| 1806 | store_register (regcache, tid, tdep->ppc_lr_regnum); |
| 1807 | if (tdep->ppc_ctr_regnum != -1) |
| 1808 | store_register (regcache, tid, tdep->ppc_ctr_regnum); |
| 1809 | if (tdep->ppc_xer_regnum != -1) |
| 1810 | store_register (regcache, tid, tdep->ppc_xer_regnum); |
| 1811 | if (tdep->ppc_mq_regnum != -1) |
| 1812 | store_register (regcache, tid, tdep->ppc_mq_regnum); |
| 1813 | if (tdep->ppc_fpscr_regnum != -1) |
| 1814 | store_register (regcache, tid, tdep->ppc_fpscr_regnum); |
| 1815 | if (ppc_linux_trap_reg_p (gdbarch)) |
| 1816 | { |
| 1817 | store_register (regcache, tid, PPC_ORIG_R3_REGNUM); |
| 1818 | store_register (regcache, tid, PPC_TRAP_REGNUM); |
| 1819 | } |
| 1820 | if (have_ptrace_getvrregs) |
| 1821 | if (tdep->ppc_vr0_regnum != -1 && tdep->ppc_vrsave_regnum != -1) |
| 1822 | store_altivec_registers (regcache, tid, -1); |
| 1823 | if (have_ptrace_getsetvsxregs) |
| 1824 | if (tdep->ppc_vsr0_upper_regnum != -1) |
| 1825 | store_vsx_registers (regcache, tid, -1); |
| 1826 | if (tdep->ppc_ev0_upper_regnum >= 0) |
| 1827 | store_spe_register (regcache, tid, -1); |
| 1828 | if (tdep->ppc_ppr_regnum != -1) |
| 1829 | store_regset (regcache, tid, -1, NT_PPC_PPR, |
| 1830 | PPC_LINUX_SIZEOF_PPRREGSET, |
| 1831 | &ppc32_linux_pprregset); |
| 1832 | if (tdep->ppc_dscr_regnum != -1) |
| 1833 | store_regset (regcache, tid, -1, NT_PPC_DSCR, |
| 1834 | PPC_LINUX_SIZEOF_DSCRREGSET, |
| 1835 | &ppc32_linux_dscrregset); |
| 1836 | if (tdep->ppc_tar_regnum != -1) |
| 1837 | store_regset (regcache, tid, -1, NT_PPC_TAR, |
| 1838 | PPC_LINUX_SIZEOF_TARREGSET, |
| 1839 | &ppc32_linux_tarregset); |
| 1840 | |
| 1841 | if (tdep->ppc_mmcr0_regnum != -1) |
| 1842 | store_regset (regcache, tid, -1, NT_PPC_PMU, |
| 1843 | PPC_LINUX_SIZEOF_PMUREGSET, |
| 1844 | &ppc32_linux_pmuregset); |
| 1845 | |
| 1846 | if (tdep->have_htm_spr) |
| 1847 | store_regset (regcache, tid, -1, NT_PPC_TM_SPR, |
| 1848 | PPC_LINUX_SIZEOF_TM_SPRREGSET, |
| 1849 | &ppc32_linux_tm_sprregset); |
| 1850 | |
| 1851 | /* Because the EBB and checkpointed HTM registers can be |
| 1852 | unavailable, attempts to store them here would cause this |
| 1853 | function to fail most of the time, so we ignore them. */ |
| 1854 | } |
| 1855 | |
| 1856 | void |
| 1857 | ppc_linux_nat_target::store_registers (struct regcache *regcache, int regno) |
| 1858 | { |
| 1859 | pid_t tid = get_ptrace_pid (regcache->ptid ()); |
| 1860 | |
| 1861 | if (regno >= 0) |
| 1862 | store_register (regcache, tid, regno); |
| 1863 | else |
| 1864 | store_ppc_registers (regcache, tid); |
| 1865 | } |
| 1866 | |
| 1867 | /* Functions for transferring registers between a gregset_t or fpregset_t |
| 1868 | (see sys/ucontext.h) and gdb's regcache. The word size is that used |
| 1869 | by the ptrace interface, not the current program's ABI. Eg. if a |
| 1870 | powerpc64-linux gdb is being used to debug a powerpc32-linux app, we |
| 1871 | read or write 64-bit gregsets. This is to suit the host libthread_db. */ |
| 1872 | |
| 1873 | void |
| 1874 | supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp) |
| 1875 | { |
| 1876 | const struct regset *regset = ppc_linux_gregset (sizeof (long)); |
| 1877 | |
| 1878 | ppc_supply_gregset (regset, regcache, -1, gregsetp, sizeof (*gregsetp)); |
| 1879 | } |
| 1880 | |
| 1881 | void |
| 1882 | fill_gregset (const struct regcache *regcache, |
| 1883 | gdb_gregset_t *gregsetp, int regno) |
| 1884 | { |
| 1885 | const struct regset *regset = ppc_linux_gregset (sizeof (long)); |
| 1886 | |
| 1887 | if (regno == -1) |
| 1888 | memset (gregsetp, 0, sizeof (*gregsetp)); |
| 1889 | ppc_collect_gregset (regset, regcache, regno, gregsetp, sizeof (*gregsetp)); |
| 1890 | } |
| 1891 | |
| 1892 | void |
| 1893 | supply_fpregset (struct regcache *regcache, const gdb_fpregset_t * fpregsetp) |
| 1894 | { |
| 1895 | const struct regset *regset = ppc_linux_fpregset (); |
| 1896 | |
| 1897 | ppc_supply_fpregset (regset, regcache, -1, |
| 1898 | fpregsetp, sizeof (*fpregsetp)); |
| 1899 | } |
| 1900 | |
| 1901 | void |
| 1902 | fill_fpregset (const struct regcache *regcache, |
| 1903 | gdb_fpregset_t *fpregsetp, int regno) |
| 1904 | { |
| 1905 | const struct regset *regset = ppc_linux_fpregset (); |
| 1906 | |
| 1907 | ppc_collect_fpregset (regset, regcache, regno, |
| 1908 | fpregsetp, sizeof (*fpregsetp)); |
| 1909 | } |
| 1910 | |
| 1911 | int |
| 1912 | ppc_linux_nat_target::auxv_parse (gdb_byte **readptr, |
| 1913 | gdb_byte *endptr, CORE_ADDR *typep, |
| 1914 | CORE_ADDR *valp) |
| 1915 | { |
| 1916 | int tid = inferior_ptid.lwp (); |
| 1917 | if (tid == 0) |
| 1918 | tid = inferior_ptid.pid (); |
| 1919 | |
| 1920 | int sizeof_auxv_field = ppc_linux_target_wordsize (tid); |
| 1921 | |
| 1922 | enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ()); |
| 1923 | gdb_byte *ptr = *readptr; |
| 1924 | |
| 1925 | if (endptr == ptr) |
| 1926 | return 0; |
| 1927 | |
| 1928 | if (endptr - ptr < sizeof_auxv_field * 2) |
| 1929 | return -1; |
| 1930 | |
| 1931 | *typep = extract_unsigned_integer (ptr, sizeof_auxv_field, byte_order); |
| 1932 | ptr += sizeof_auxv_field; |
| 1933 | *valp = extract_unsigned_integer (ptr, sizeof_auxv_field, byte_order); |
| 1934 | ptr += sizeof_auxv_field; |
| 1935 | |
| 1936 | *readptr = ptr; |
| 1937 | return 1; |
| 1938 | } |
| 1939 | |
| 1940 | const struct target_desc * |
| 1941 | ppc_linux_nat_target::read_description () |
| 1942 | { |
| 1943 | int tid = inferior_ptid.lwp (); |
| 1944 | if (tid == 0) |
| 1945 | tid = inferior_ptid.pid (); |
| 1946 | |
| 1947 | if (have_ptrace_getsetevrregs) |
| 1948 | { |
| 1949 | struct gdb_evrregset_t evrregset; |
| 1950 | |
| 1951 | if (ptrace (PTRACE_GETEVRREGS, tid, 0, &evrregset) >= 0) |
| 1952 | return tdesc_powerpc_e500l; |
| 1953 | |
| 1954 | /* EIO means that the PTRACE_GETEVRREGS request isn't supported. |
| 1955 | Anything else needs to be reported. */ |
| 1956 | else if (errno != EIO) |
| 1957 | perror_with_name (_("Unable to fetch SPE registers")); |
| 1958 | } |
| 1959 | |
| 1960 | struct ppc_linux_features features = ppc_linux_no_features; |
| 1961 | |
| 1962 | features.wordsize = ppc_linux_target_wordsize (tid); |
| 1963 | |
| 1964 | CORE_ADDR hwcap = linux_get_hwcap (current_top_target ()); |
| 1965 | CORE_ADDR hwcap2 = linux_get_hwcap2 (current_top_target ()); |
| 1966 | |
| 1967 | if (have_ptrace_getsetvsxregs |
| 1968 | && (hwcap & PPC_FEATURE_HAS_VSX)) |
| 1969 | { |
| 1970 | gdb_vsxregset_t vsxregset; |
| 1971 | |
| 1972 | if (ptrace (PTRACE_GETVSXREGS, tid, 0, &vsxregset) >= 0) |
| 1973 | features.vsx = true; |
| 1974 | |
| 1975 | /* EIO means that the PTRACE_GETVSXREGS request isn't supported. |
| 1976 | Anything else needs to be reported. */ |
| 1977 | else if (errno != EIO) |
| 1978 | perror_with_name (_("Unable to fetch VSX registers")); |
| 1979 | } |
| 1980 | |
| 1981 | if (have_ptrace_getvrregs |
| 1982 | && (hwcap & PPC_FEATURE_HAS_ALTIVEC)) |
| 1983 | { |
| 1984 | gdb_vrregset_t vrregset; |
| 1985 | |
| 1986 | if (ptrace (PTRACE_GETVRREGS, tid, 0, &vrregset) >= 0) |
| 1987 | features.altivec = true; |
| 1988 | |
| 1989 | /* EIO means that the PTRACE_GETVRREGS request isn't supported. |
| 1990 | Anything else needs to be reported. */ |
| 1991 | else if (errno != EIO) |
| 1992 | perror_with_name (_("Unable to fetch AltiVec registers")); |
| 1993 | } |
| 1994 | |
| 1995 | features.isa205 = ppc_linux_has_isa205 (hwcap); |
| 1996 | |
| 1997 | if ((hwcap2 & PPC_FEATURE2_DSCR) |
| 1998 | && check_regset (tid, NT_PPC_PPR, PPC_LINUX_SIZEOF_PPRREGSET) |
| 1999 | && check_regset (tid, NT_PPC_DSCR, PPC_LINUX_SIZEOF_DSCRREGSET)) |
| 2000 | { |
| 2001 | features.ppr_dscr = true; |
| 2002 | if ((hwcap2 & PPC_FEATURE2_ARCH_2_07) |
| 2003 | && (hwcap2 & PPC_FEATURE2_TAR) |
| 2004 | && (hwcap2 & PPC_FEATURE2_EBB) |
| 2005 | && check_regset (tid, NT_PPC_TAR, PPC_LINUX_SIZEOF_TARREGSET) |
| 2006 | && check_regset (tid, NT_PPC_EBB, PPC_LINUX_SIZEOF_EBBREGSET) |
| 2007 | && check_regset (tid, NT_PPC_PMU, PPC_LINUX_SIZEOF_PMUREGSET)) |
| 2008 | { |
| 2009 | features.isa207 = true; |
| 2010 | if ((hwcap2 & PPC_FEATURE2_HTM) |
| 2011 | && check_regset (tid, NT_PPC_TM_SPR, |
| 2012 | PPC_LINUX_SIZEOF_TM_SPRREGSET)) |
| 2013 | features.htm = true; |
| 2014 | } |
| 2015 | } |
| 2016 | |
| 2017 | return ppc_linux_match_description (features); |
| 2018 | } |
| 2019 | |
| 2020 | /* Routines for installing hardware watchpoints and breakpoints. When |
| 2021 | GDB requests a hardware watchpoint or breakpoint to be installed, we |
| 2022 | register the request for the pid of inferior_ptid in a map with one |
| 2023 | entry per process. We then issue a stop request to all the threads of |
| 2024 | this process, and mark a per-thread flag indicating that their debug |
| 2025 | registers should be updated. Right before they are next resumed, we |
| 2026 | remove all previously installed debug registers and install all the |
| 2027 | ones GDB requested. We then update a map with one entry per thread |
| 2028 | that keeps track of what debug registers were last installed in each |
| 2029 | thread. |
| 2030 | |
| 2031 | We use this second map to remove installed registers before installing |
| 2032 | the ones requested by GDB, and to copy the debug register state after |
| 2033 | a thread clones or forks, since depending on the kernel configuration, |
| 2034 | debug registers can be inherited. */ |
| 2035 | |
| 2036 | /* Check if we support and have enough resources to install a hardware |
| 2037 | watchpoint or breakpoint. See the description in target.h. */ |
| 2038 | |
| 2039 | int |
| 2040 | ppc_linux_nat_target::can_use_hw_breakpoint (enum bptype type, int cnt, |
| 2041 | int ot) |
| 2042 | { |
| 2043 | int total_hw_wp, total_hw_bp; |
| 2044 | |
| 2045 | m_dreg_interface.detect (inferior_ptid); |
| 2046 | |
| 2047 | if (m_dreg_interface.unavailable_p ()) |
| 2048 | return 0; |
| 2049 | |
| 2050 | if (m_dreg_interface.hwdebug_p ()) |
| 2051 | { |
| 2052 | /* When PowerPC HWDEBUG ptrace interface is available, the number of |
| 2053 | available hardware watchpoints and breakpoints is stored at the |
| 2054 | hwdebug_info struct. */ |
| 2055 | total_hw_bp = m_dreg_interface.hwdebug_info ().num_instruction_bps; |
| 2056 | total_hw_wp = m_dreg_interface.hwdebug_info ().num_data_bps; |
| 2057 | } |
| 2058 | else |
| 2059 | { |
| 2060 | gdb_assert (m_dreg_interface.debugreg_p ()); |
| 2061 | |
| 2062 | /* With the DEBUGREG ptrace interface, we should consider having 1 |
| 2063 | hardware watchpoint and no hardware breakpoints. */ |
| 2064 | total_hw_bp = 0; |
| 2065 | total_hw_wp = 1; |
| 2066 | } |
| 2067 | |
| 2068 | if (type == bp_hardware_watchpoint || type == bp_read_watchpoint |
| 2069 | || type == bp_access_watchpoint || type == bp_watchpoint) |
| 2070 | { |
| 2071 | if (total_hw_wp == 0) |
| 2072 | return 0; |
| 2073 | else if (cnt + ot > total_hw_wp) |
| 2074 | return -1; |
| 2075 | else |
| 2076 | return 1; |
| 2077 | } |
| 2078 | else if (type == bp_hardware_breakpoint) |
| 2079 | { |
| 2080 | if (total_hw_bp == 0) |
| 2081 | return 0; |
| 2082 | else if (cnt > total_hw_bp) |
| 2083 | return -1; |
| 2084 | else |
| 2085 | return 1; |
| 2086 | } |
| 2087 | |
| 2088 | return 0; |
| 2089 | } |
| 2090 | |
| 2091 | /* Returns 1 if we can watch LEN bytes at address ADDR, 0 otherwise. */ |
| 2092 | |
| 2093 | int |
| 2094 | ppc_linux_nat_target::region_ok_for_hw_watchpoint (CORE_ADDR addr, int len) |
| 2095 | { |
| 2096 | /* Handle sub-8-byte quantities. */ |
| 2097 | if (len <= 0) |
| 2098 | return 0; |
| 2099 | |
| 2100 | m_dreg_interface.detect (inferior_ptid); |
| 2101 | |
| 2102 | if (m_dreg_interface.unavailable_p ()) |
| 2103 | return 0; |
| 2104 | |
| 2105 | /* The PowerPC HWDEBUG ptrace interface tells if there are alignment |
| 2106 | restrictions for watchpoints in the processors. In that case, we use that |
| 2107 | information to determine the hardcoded watchable region for |
| 2108 | watchpoints. */ |
| 2109 | if (m_dreg_interface.hwdebug_p ()) |
| 2110 | { |
| 2111 | int region_size; |
| 2112 | const struct ppc_debug_info &hwdebug_info = (m_dreg_interface |
| 2113 | .hwdebug_info ()); |
| 2114 | |
| 2115 | /* Embedded DAC-based processors, like the PowerPC 440 have ranged |
| 2116 | watchpoints and can watch any access within an arbitrary memory |
| 2117 | region. This is useful to watch arrays and structs, for instance. It |
| 2118 | takes two hardware watchpoints though. */ |
| 2119 | if (len > 1 |
| 2120 | && hwdebug_info.features & PPC_DEBUG_FEATURE_DATA_BP_RANGE |
| 2121 | && linux_get_hwcap (current_top_target ()) & PPC_FEATURE_BOOKE) |
| 2122 | return 2; |
| 2123 | /* Check if the processor provides DAWR interface. */ |
| 2124 | if (hwdebug_info.features & PPC_DEBUG_FEATURE_DATA_BP_DAWR) |
| 2125 | /* DAWR interface allows to watch up to 512 byte wide ranges which |
| 2126 | can't cross a 512 byte boundary. */ |
| 2127 | region_size = 512; |
| 2128 | else |
| 2129 | region_size = hwdebug_info.data_bp_alignment; |
| 2130 | /* Server processors provide one hardware watchpoint and addr+len should |
| 2131 | fall in the watchable region provided by the ptrace interface. */ |
| 2132 | if (region_size |
| 2133 | && (addr + len > (addr & ~(region_size - 1)) + region_size)) |
| 2134 | return 0; |
| 2135 | } |
| 2136 | /* addr+len must fall in the 8 byte watchable region for DABR-based |
| 2137 | processors (i.e., server processors). Without the new PowerPC HWDEBUG |
| 2138 | ptrace interface, DAC-based processors (i.e., embedded processors) will |
| 2139 | use addresses aligned to 4-bytes due to the way the read/write flags are |
| 2140 | passed in the old ptrace interface. */ |
| 2141 | else |
| 2142 | { |
| 2143 | gdb_assert (m_dreg_interface.debugreg_p ()); |
| 2144 | |
| 2145 | if (((linux_get_hwcap (current_top_target ()) & PPC_FEATURE_BOOKE) |
| 2146 | && (addr + len) > (addr & ~3) + 4) |
| 2147 | || (addr + len) > (addr & ~7) + 8) |
| 2148 | return 0; |
| 2149 | } |
| 2150 | |
| 2151 | return 1; |
| 2152 | } |
| 2153 | |
| 2154 | /* This function compares two ppc_hw_breakpoint structs |
| 2155 | field-by-field. */ |
| 2156 | |
| 2157 | bool |
| 2158 | ppc_linux_nat_target::hwdebug_point_cmp (const struct ppc_hw_breakpoint &a, |
| 2159 | const struct ppc_hw_breakpoint &b) |
| 2160 | { |
| 2161 | return (a.trigger_type == b.trigger_type |
| 2162 | && a.addr_mode == b.addr_mode |
| 2163 | && a.condition_mode == b.condition_mode |
| 2164 | && a.addr == b.addr |
| 2165 | && a.addr2 == b.addr2 |
| 2166 | && a.condition_value == b.condition_value); |
| 2167 | } |
| 2168 | |
| 2169 | /* Return the number of registers needed for a ranged breakpoint. */ |
| 2170 | |
| 2171 | int |
| 2172 | ppc_linux_nat_target::ranged_break_num_registers () |
| 2173 | { |
| 2174 | m_dreg_interface.detect (inferior_ptid); |
| 2175 | |
| 2176 | return ((m_dreg_interface.hwdebug_p () |
| 2177 | && (m_dreg_interface.hwdebug_info ().features |
| 2178 | & PPC_DEBUG_FEATURE_INSN_BP_RANGE))? |
| 2179 | 2 : -1); |
| 2180 | } |
| 2181 | |
| 2182 | /* Register the hardware breakpoint described by BP_TGT, to be inserted |
| 2183 | when the threads of inferior_ptid are resumed. Returns 0 for success, |
| 2184 | or -1 if the HWDEBUG interface that we need for hardware breakpoints |
| 2185 | is not available. */ |
| 2186 | |
| 2187 | int |
| 2188 | ppc_linux_nat_target::insert_hw_breakpoint (struct gdbarch *gdbarch, |
| 2189 | struct bp_target_info *bp_tgt) |
| 2190 | { |
| 2191 | struct ppc_hw_breakpoint p; |
| 2192 | |
| 2193 | m_dreg_interface.detect (inferior_ptid); |
| 2194 | |
| 2195 | if (!m_dreg_interface.hwdebug_p ()) |
| 2196 | return -1; |
| 2197 | |
| 2198 | p.version = PPC_DEBUG_CURRENT_VERSION; |
| 2199 | p.trigger_type = PPC_BREAKPOINT_TRIGGER_EXECUTE; |
| 2200 | p.condition_mode = PPC_BREAKPOINT_CONDITION_NONE; |
| 2201 | p.addr = (uint64_t) (bp_tgt->placed_address = bp_tgt->reqstd_address); |
| 2202 | p.condition_value = 0; |
| 2203 | |
| 2204 | if (bp_tgt->length) |
| 2205 | { |
| 2206 | p.addr_mode = PPC_BREAKPOINT_MODE_RANGE_INCLUSIVE; |
| 2207 | |
| 2208 | /* The breakpoint will trigger if the address of the instruction is |
| 2209 | within the defined range, as follows: p.addr <= address < p.addr2. */ |
| 2210 | p.addr2 = (uint64_t) bp_tgt->placed_address + bp_tgt->length; |
| 2211 | } |
| 2212 | else |
| 2213 | { |
| 2214 | p.addr_mode = PPC_BREAKPOINT_MODE_EXACT; |
| 2215 | p.addr2 = 0; |
| 2216 | } |
| 2217 | |
| 2218 | register_hw_breakpoint (inferior_ptid.pid (), p); |
| 2219 | |
| 2220 | return 0; |
| 2221 | } |
| 2222 | |
| 2223 | /* Clear a registration for the hardware breakpoint given by type BP_TGT. |
| 2224 | It will be removed from the threads of inferior_ptid when they are |
| 2225 | next resumed. Returns 0 for success, or -1 if the HWDEBUG interface |
| 2226 | that we need for hardware breakpoints is not available. */ |
| 2227 | |
| 2228 | int |
| 2229 | ppc_linux_nat_target::remove_hw_breakpoint (struct gdbarch *gdbarch, |
| 2230 | struct bp_target_info *bp_tgt) |
| 2231 | { |
| 2232 | struct ppc_hw_breakpoint p; |
| 2233 | |
| 2234 | m_dreg_interface.detect (inferior_ptid); |
| 2235 | |
| 2236 | if (!m_dreg_interface.hwdebug_p ()) |
| 2237 | return -1; |
| 2238 | |
| 2239 | p.version = PPC_DEBUG_CURRENT_VERSION; |
| 2240 | p.trigger_type = PPC_BREAKPOINT_TRIGGER_EXECUTE; |
| 2241 | p.condition_mode = PPC_BREAKPOINT_CONDITION_NONE; |
| 2242 | p.addr = (uint64_t) bp_tgt->placed_address; |
| 2243 | p.condition_value = 0; |
| 2244 | |
| 2245 | if (bp_tgt->length) |
| 2246 | { |
| 2247 | p.addr_mode = PPC_BREAKPOINT_MODE_RANGE_INCLUSIVE; |
| 2248 | |
| 2249 | /* The breakpoint will trigger if the address of the instruction is within |
| 2250 | the defined range, as follows: p.addr <= address < p.addr2. */ |
| 2251 | p.addr2 = (uint64_t) bp_tgt->placed_address + bp_tgt->length; |
| 2252 | } |
| 2253 | else |
| 2254 | { |
| 2255 | p.addr_mode = PPC_BREAKPOINT_MODE_EXACT; |
| 2256 | p.addr2 = 0; |
| 2257 | } |
| 2258 | |
| 2259 | clear_hw_breakpoint (inferior_ptid.pid (), p); |
| 2260 | |
| 2261 | return 0; |
| 2262 | } |
| 2263 | |
| 2264 | /* Return the trigger value to set in a ppc_hw_breakpoint object for a |
| 2265 | given hardware watchpoint TYPE. We assume type is not hw_execute. */ |
| 2266 | |
| 2267 | int |
| 2268 | ppc_linux_nat_target::get_trigger_type (enum target_hw_bp_type type) |
| 2269 | { |
| 2270 | int t; |
| 2271 | |
| 2272 | if (type == hw_read) |
| 2273 | t = PPC_BREAKPOINT_TRIGGER_READ; |
| 2274 | else if (type == hw_write) |
| 2275 | t = PPC_BREAKPOINT_TRIGGER_WRITE; |
| 2276 | else |
| 2277 | t = PPC_BREAKPOINT_TRIGGER_READ | PPC_BREAKPOINT_TRIGGER_WRITE; |
| 2278 | |
| 2279 | return t; |
| 2280 | } |
| 2281 | |
| 2282 | /* Register a new masked watchpoint at ADDR using the mask MASK, to be |
| 2283 | inserted when the threads of inferior_ptid are resumed. RW may be |
| 2284 | hw_read for a read watchpoint, hw_write for a write watchpoint or |
| 2285 | hw_access for an access watchpoint. */ |
| 2286 | |
| 2287 | int |
| 2288 | ppc_linux_nat_target::insert_mask_watchpoint (CORE_ADDR addr, CORE_ADDR mask, |
| 2289 | target_hw_bp_type rw) |
| 2290 | { |
| 2291 | struct ppc_hw_breakpoint p; |
| 2292 | |
| 2293 | gdb_assert (m_dreg_interface.hwdebug_p ()); |
| 2294 | |
| 2295 | p.version = PPC_DEBUG_CURRENT_VERSION; |
| 2296 | p.trigger_type = get_trigger_type (rw); |
| 2297 | p.addr_mode = PPC_BREAKPOINT_MODE_MASK; |
| 2298 | p.condition_mode = PPC_BREAKPOINT_CONDITION_NONE; |
| 2299 | p.addr = addr; |
| 2300 | p.addr2 = mask; |
| 2301 | p.condition_value = 0; |
| 2302 | |
| 2303 | register_hw_breakpoint (inferior_ptid.pid (), p); |
| 2304 | |
| 2305 | return 0; |
| 2306 | } |
| 2307 | |
| 2308 | /* Clear a registration for a masked watchpoint at ADDR with the mask |
| 2309 | MASK. It will be removed from the threads of inferior_ptid when they |
| 2310 | are next resumed. RW may be hw_read for a read watchpoint, hw_write |
| 2311 | for a write watchpoint or hw_access for an access watchpoint. */ |
| 2312 | |
| 2313 | int |
| 2314 | ppc_linux_nat_target::remove_mask_watchpoint (CORE_ADDR addr, CORE_ADDR mask, |
| 2315 | target_hw_bp_type rw) |
| 2316 | { |
| 2317 | struct ppc_hw_breakpoint p; |
| 2318 | |
| 2319 | gdb_assert (m_dreg_interface.hwdebug_p ()); |
| 2320 | |
| 2321 | p.version = PPC_DEBUG_CURRENT_VERSION; |
| 2322 | p.trigger_type = get_trigger_type (rw); |
| 2323 | p.addr_mode = PPC_BREAKPOINT_MODE_MASK; |
| 2324 | p.condition_mode = PPC_BREAKPOINT_CONDITION_NONE; |
| 2325 | p.addr = addr; |
| 2326 | p.addr2 = mask; |
| 2327 | p.condition_value = 0; |
| 2328 | |
| 2329 | clear_hw_breakpoint (inferior_ptid.pid (), p); |
| 2330 | |
| 2331 | return 0; |
| 2332 | } |
| 2333 | |
| 2334 | /* Check whether we have at least one free DVC register for the threads |
| 2335 | of the pid of inferior_ptid. */ |
| 2336 | |
| 2337 | bool |
| 2338 | ppc_linux_nat_target::can_use_watchpoint_cond_accel (void) |
| 2339 | { |
| 2340 | m_dreg_interface.detect (inferior_ptid); |
| 2341 | |
| 2342 | if (!m_dreg_interface.hwdebug_p ()) |
| 2343 | return false; |
| 2344 | |
| 2345 | int cnt = m_dreg_interface.hwdebug_info ().num_condition_regs; |
| 2346 | |
| 2347 | if (cnt == 0) |
| 2348 | return false; |
| 2349 | |
| 2350 | auto process_it = m_process_info.find (inferior_ptid.pid ()); |
| 2351 | |
| 2352 | /* No breakpoints or watchpoints have been requested for this process, |
| 2353 | we have at least one free DVC register. */ |
| 2354 | if (process_it == m_process_info.end ()) |
| 2355 | return true; |
| 2356 | |
| 2357 | for (const ppc_hw_breakpoint &bp : process_it->second.requested_hw_bps) |
| 2358 | if (bp.condition_mode != PPC_BREAKPOINT_CONDITION_NONE) |
| 2359 | cnt--; |
| 2360 | |
| 2361 | if (cnt <= 0) |
| 2362 | return false; |
| 2363 | |
| 2364 | return true; |
| 2365 | } |
| 2366 | |
| 2367 | /* Calculate the enable bits and the contents of the Data Value Compare |
| 2368 | debug register present in BookE processors. |
| 2369 | |
| 2370 | ADDR is the address to be watched, LEN is the length of watched data |
| 2371 | and DATA_VALUE is the value which will trigger the watchpoint. |
| 2372 | On exit, CONDITION_MODE will hold the enable bits for the DVC, and |
| 2373 | CONDITION_VALUE will hold the value which should be put in the |
| 2374 | DVC register. */ |
| 2375 | |
| 2376 | void |
| 2377 | ppc_linux_nat_target::calculate_dvc (CORE_ADDR addr, int len, |
| 2378 | CORE_ADDR data_value, |
| 2379 | uint32_t *condition_mode, |
| 2380 | uint64_t *condition_value) |
| 2381 | { |
| 2382 | const struct ppc_debug_info &hwdebug_info = (m_dreg_interface. |
| 2383 | hwdebug_info ()); |
| 2384 | |
| 2385 | int i, num_byte_enable, align_offset, num_bytes_off_dvc, |
| 2386 | rightmost_enabled_byte; |
| 2387 | CORE_ADDR addr_end_data, addr_end_dvc; |
| 2388 | |
| 2389 | /* The DVC register compares bytes within fixed-length windows which |
| 2390 | are word-aligned, with length equal to that of the DVC register. |
| 2391 | We need to calculate where our watch region is relative to that |
| 2392 | window and enable comparison of the bytes which fall within it. */ |
| 2393 | |
| 2394 | align_offset = addr % hwdebug_info.sizeof_condition; |
| 2395 | addr_end_data = addr + len; |
| 2396 | addr_end_dvc = (addr - align_offset |
| 2397 | + hwdebug_info.sizeof_condition); |
| 2398 | num_bytes_off_dvc = (addr_end_data > addr_end_dvc)? |
| 2399 | addr_end_data - addr_end_dvc : 0; |
| 2400 | num_byte_enable = len - num_bytes_off_dvc; |
| 2401 | /* Here, bytes are numbered from right to left. */ |
| 2402 | rightmost_enabled_byte = (addr_end_data < addr_end_dvc)? |
| 2403 | addr_end_dvc - addr_end_data : 0; |
| 2404 | |
| 2405 | *condition_mode = PPC_BREAKPOINT_CONDITION_AND; |
| 2406 | for (i = 0; i < num_byte_enable; i++) |
| 2407 | *condition_mode |
| 2408 | |= PPC_BREAKPOINT_CONDITION_BE (i + rightmost_enabled_byte); |
| 2409 | |
| 2410 | /* Now we need to match the position within the DVC of the comparison |
| 2411 | value with where the watch region is relative to the window |
| 2412 | (i.e., the ALIGN_OFFSET). */ |
| 2413 | |
| 2414 | *condition_value = ((uint64_t) data_value >> num_bytes_off_dvc * 8 |
| 2415 | << rightmost_enabled_byte * 8); |
| 2416 | } |
| 2417 | |
| 2418 | /* Return the number of memory locations that need to be accessed to |
| 2419 | evaluate the expression which generated the given value chain. |
| 2420 | Returns -1 if there's any register access involved, or if there are |
| 2421 | other kinds of values which are not acceptable in a condition |
| 2422 | expression (e.g., lval_computed or lval_internalvar). */ |
| 2423 | |
| 2424 | int |
| 2425 | ppc_linux_nat_target::num_memory_accesses (const std::vector<value_ref_ptr> |
| 2426 | &chain) |
| 2427 | { |
| 2428 | int found_memory_cnt = 0; |
| 2429 | |
| 2430 | /* The idea here is that evaluating an expression generates a series |
| 2431 | of values, one holding the value of every subexpression. (The |
| 2432 | expression a*b+c has five subexpressions: a, b, a*b, c, and |
| 2433 | a*b+c.) GDB's values hold almost enough information to establish |
| 2434 | the criteria given above --- they identify memory lvalues, |
| 2435 | register lvalues, computed values, etcetera. So we can evaluate |
| 2436 | the expression, and then scan the chain of values that leaves |
| 2437 | behind to determine the memory locations involved in the evaluation |
| 2438 | of an expression. |
| 2439 | |
| 2440 | However, I don't think that the values returned by inferior |
| 2441 | function calls are special in any way. So this function may not |
| 2442 | notice that an expression contains an inferior function call. |
| 2443 | FIXME. */ |
| 2444 | |
| 2445 | for (const value_ref_ptr &iter : chain) |
| 2446 | { |
| 2447 | struct value *v = iter.get (); |
| 2448 | |
| 2449 | /* Constants and values from the history are fine. */ |
| 2450 | if (VALUE_LVAL (v) == not_lval || deprecated_value_modifiable (v) == 0) |
| 2451 | continue; |
| 2452 | else if (VALUE_LVAL (v) == lval_memory) |
| 2453 | { |
| 2454 | /* A lazy memory lvalue is one that GDB never needed to fetch; |
| 2455 | we either just used its address (e.g., `a' in `a.b') or |
| 2456 | we never needed it at all (e.g., `a' in `a,b'). */ |
| 2457 | if (!value_lazy (v)) |
| 2458 | found_memory_cnt++; |
| 2459 | } |
| 2460 | /* Other kinds of values are not fine. */ |
| 2461 | else |
| 2462 | return -1; |
| 2463 | } |
| 2464 | |
| 2465 | return found_memory_cnt; |
| 2466 | } |
| 2467 | |
| 2468 | /* Verifies whether the expression COND can be implemented using the |
| 2469 | DVC (Data Value Compare) register in BookE processors. The expression |
| 2470 | must test the watch value for equality with a constant expression. |
| 2471 | If the function returns 1, DATA_VALUE will contain the constant against |
| 2472 | which the watch value should be compared and LEN will contain the size |
| 2473 | of the constant. */ |
| 2474 | |
| 2475 | int |
| 2476 | ppc_linux_nat_target::check_condition (CORE_ADDR watch_addr, |
| 2477 | struct expression *cond, |
| 2478 | CORE_ADDR *data_value, int *len) |
| 2479 | { |
| 2480 | int pc = 1, num_accesses_left, num_accesses_right; |
| 2481 | struct value *left_val, *right_val; |
| 2482 | std::vector<value_ref_ptr> left_chain, right_chain; |
| 2483 | |
| 2484 | if (cond->elts[0].opcode != BINOP_EQUAL) |
| 2485 | return 0; |
| 2486 | |
| 2487 | fetch_subexp_value (cond, &pc, &left_val, NULL, &left_chain, 0); |
| 2488 | num_accesses_left = num_memory_accesses (left_chain); |
| 2489 | |
| 2490 | if (left_val == NULL || num_accesses_left < 0) |
| 2491 | return 0; |
| 2492 | |
| 2493 | fetch_subexp_value (cond, &pc, &right_val, NULL, &right_chain, 0); |
| 2494 | num_accesses_right = num_memory_accesses (right_chain); |
| 2495 | |
| 2496 | if (right_val == NULL || num_accesses_right < 0) |
| 2497 | return 0; |
| 2498 | |
| 2499 | if (num_accesses_left == 1 && num_accesses_right == 0 |
| 2500 | && VALUE_LVAL (left_val) == lval_memory |
| 2501 | && value_address (left_val) == watch_addr) |
| 2502 | { |
| 2503 | *data_value = value_as_long (right_val); |
| 2504 | |
| 2505 | /* DATA_VALUE is the constant in RIGHT_VAL, but actually has |
| 2506 | the same type as the memory region referenced by LEFT_VAL. */ |
| 2507 | *len = TYPE_LENGTH (check_typedef (value_type (left_val))); |
| 2508 | } |
| 2509 | else if (num_accesses_left == 0 && num_accesses_right == 1 |
| 2510 | && VALUE_LVAL (right_val) == lval_memory |
| 2511 | && value_address (right_val) == watch_addr) |
| 2512 | { |
| 2513 | *data_value = value_as_long (left_val); |
| 2514 | |
| 2515 | /* DATA_VALUE is the constant in LEFT_VAL, but actually has |
| 2516 | the same type as the memory region referenced by RIGHT_VAL. */ |
| 2517 | *len = TYPE_LENGTH (check_typedef (value_type (right_val))); |
| 2518 | } |
| 2519 | else |
| 2520 | return 0; |
| 2521 | |
| 2522 | return 1; |
| 2523 | } |
| 2524 | |
| 2525 | /* Return true if the target is capable of using hardware to evaluate the |
| 2526 | condition expression, thus only triggering the watchpoint when it is |
| 2527 | true. */ |
| 2528 | |
| 2529 | bool |
| 2530 | ppc_linux_nat_target::can_accel_watchpoint_condition (CORE_ADDR addr, |
| 2531 | int len, int rw, |
| 2532 | struct expression *cond) |
| 2533 | { |
| 2534 | CORE_ADDR data_value; |
| 2535 | |
| 2536 | m_dreg_interface.detect (inferior_ptid); |
| 2537 | |
| 2538 | return (m_dreg_interface.hwdebug_p () |
| 2539 | && (m_dreg_interface.hwdebug_info ().num_condition_regs > 0) |
| 2540 | && check_condition (addr, cond, &data_value, &len)); |
| 2541 | } |
| 2542 | |
| 2543 | /* Set up P with the parameters necessary to request a watchpoint covering |
| 2544 | LEN bytes starting at ADDR and if possible with condition expression COND |
| 2545 | evaluated by hardware. INSERT tells if we are creating a request for |
| 2546 | inserting or removing the watchpoint. */ |
| 2547 | |
| 2548 | void |
| 2549 | ppc_linux_nat_target::create_watchpoint_request (struct ppc_hw_breakpoint *p, |
| 2550 | CORE_ADDR addr, int len, |
| 2551 | enum target_hw_bp_type type, |
| 2552 | struct expression *cond, |
| 2553 | int insert) |
| 2554 | { |
| 2555 | const struct ppc_debug_info &hwdebug_info = (m_dreg_interface |
| 2556 | .hwdebug_info ()); |
| 2557 | |
| 2558 | if (len == 1 |
| 2559 | || !(hwdebug_info.features & PPC_DEBUG_FEATURE_DATA_BP_RANGE)) |
| 2560 | { |
| 2561 | int use_condition; |
| 2562 | CORE_ADDR data_value; |
| 2563 | |
| 2564 | use_condition = (insert? can_use_watchpoint_cond_accel () |
| 2565 | : hwdebug_info.num_condition_regs > 0); |
| 2566 | if (cond && use_condition && check_condition (addr, cond, |
| 2567 | &data_value, &len)) |
| 2568 | calculate_dvc (addr, len, data_value, &p->condition_mode, |
| 2569 | &p->condition_value); |
| 2570 | else |
| 2571 | { |
| 2572 | p->condition_mode = PPC_BREAKPOINT_CONDITION_NONE; |
| 2573 | p->condition_value = 0; |
| 2574 | } |
| 2575 | |
| 2576 | p->addr_mode = PPC_BREAKPOINT_MODE_EXACT; |
| 2577 | p->addr2 = 0; |
| 2578 | } |
| 2579 | else |
| 2580 | { |
| 2581 | p->addr_mode = PPC_BREAKPOINT_MODE_RANGE_INCLUSIVE; |
| 2582 | p->condition_mode = PPC_BREAKPOINT_CONDITION_NONE; |
| 2583 | p->condition_value = 0; |
| 2584 | |
| 2585 | /* The watchpoint will trigger if the address of the memory access is |
| 2586 | within the defined range, as follows: p->addr <= address < p->addr2. |
| 2587 | |
| 2588 | Note that the above sentence just documents how ptrace interprets |
| 2589 | its arguments; the watchpoint is set to watch the range defined by |
| 2590 | the user _inclusively_, as specified by the user interface. */ |
| 2591 | p->addr2 = (uint64_t) addr + len; |
| 2592 | } |
| 2593 | |
| 2594 | p->version = PPC_DEBUG_CURRENT_VERSION; |
| 2595 | p->trigger_type = get_trigger_type (type); |
| 2596 | p->addr = (uint64_t) addr; |
| 2597 | } |
| 2598 | |
| 2599 | /* Register a watchpoint, to be inserted when the threads of the group of |
| 2600 | inferior_ptid are next resumed. Returns 0 on success, and -1 if there |
| 2601 | is no ptrace interface available to install the watchpoint. */ |
| 2602 | |
| 2603 | int |
| 2604 | ppc_linux_nat_target::insert_watchpoint (CORE_ADDR addr, int len, |
| 2605 | enum target_hw_bp_type type, |
| 2606 | struct expression *cond) |
| 2607 | { |
| 2608 | m_dreg_interface.detect (inferior_ptid); |
| 2609 | |
| 2610 | if (m_dreg_interface.unavailable_p ()) |
| 2611 | return -1; |
| 2612 | |
| 2613 | if (m_dreg_interface.hwdebug_p ()) |
| 2614 | { |
| 2615 | struct ppc_hw_breakpoint p; |
| 2616 | |
| 2617 | create_watchpoint_request (&p, addr, len, type, cond, 1); |
| 2618 | |
| 2619 | register_hw_breakpoint (inferior_ptid.pid (), p); |
| 2620 | } |
| 2621 | else |
| 2622 | { |
| 2623 | gdb_assert (m_dreg_interface.debugreg_p ()); |
| 2624 | |
| 2625 | long wp_value; |
| 2626 | long read_mode, write_mode; |
| 2627 | |
| 2628 | if (linux_get_hwcap (current_top_target ()) & PPC_FEATURE_BOOKE) |
| 2629 | { |
| 2630 | /* PowerPC 440 requires only the read/write flags to be passed |
| 2631 | to the kernel. */ |
| 2632 | read_mode = 1; |
| 2633 | write_mode = 2; |
| 2634 | } |
| 2635 | else |
| 2636 | { |
| 2637 | /* PowerPC 970 and other DABR-based processors are required to pass |
| 2638 | the Breakpoint Translation bit together with the flags. */ |
| 2639 | read_mode = 5; |
| 2640 | write_mode = 6; |
| 2641 | } |
| 2642 | |
| 2643 | wp_value = addr & ~(read_mode | write_mode); |
| 2644 | switch (type) |
| 2645 | { |
| 2646 | case hw_read: |
| 2647 | /* Set read and translate bits. */ |
| 2648 | wp_value |= read_mode; |
| 2649 | break; |
| 2650 | case hw_write: |
| 2651 | /* Set write and translate bits. */ |
| 2652 | wp_value |= write_mode; |
| 2653 | break; |
| 2654 | case hw_access: |
| 2655 | /* Set read, write and translate bits. */ |
| 2656 | wp_value |= read_mode | write_mode; |
| 2657 | break; |
| 2658 | } |
| 2659 | |
| 2660 | register_wp (inferior_ptid.pid (), wp_value); |
| 2661 | } |
| 2662 | |
| 2663 | return 0; |
| 2664 | } |
| 2665 | |
| 2666 | /* Clear a registration for a hardware watchpoint. It will be removed |
| 2667 | from the threads of the group of inferior_ptid when they are next |
| 2668 | resumed. */ |
| 2669 | |
| 2670 | int |
| 2671 | ppc_linux_nat_target::remove_watchpoint (CORE_ADDR addr, int len, |
| 2672 | enum target_hw_bp_type type, |
| 2673 | struct expression *cond) |
| 2674 | { |
| 2675 | gdb_assert (!m_dreg_interface.unavailable_p ()); |
| 2676 | |
| 2677 | if (m_dreg_interface.hwdebug_p ()) |
| 2678 | { |
| 2679 | struct ppc_hw_breakpoint p; |
| 2680 | |
| 2681 | create_watchpoint_request (&p, addr, len, type, cond, 0); |
| 2682 | |
| 2683 | clear_hw_breakpoint (inferior_ptid.pid (), p); |
| 2684 | } |
| 2685 | else |
| 2686 | { |
| 2687 | gdb_assert (m_dreg_interface.debugreg_p ()); |
| 2688 | |
| 2689 | clear_wp (inferior_ptid.pid ()); |
| 2690 | } |
| 2691 | |
| 2692 | return 0; |
| 2693 | } |
| 2694 | |
| 2695 | /* Clean up the per-process info associated with PID. When using the |
| 2696 | HWDEBUG interface, we also erase the per-thread state of installed |
| 2697 | debug registers for all the threads that belong to the group of PID. |
| 2698 | |
| 2699 | Usually the thread state is cleaned up by low_delete_thread. We also |
| 2700 | do it here because low_new_thread is not called for the initial LWP, |
| 2701 | so low_delete_thread won't be able to clean up this state. */ |
| 2702 | |
| 2703 | void |
| 2704 | ppc_linux_nat_target::low_forget_process (pid_t pid) |
| 2705 | { |
| 2706 | if ((!m_dreg_interface.detected_p ()) |
| 2707 | || (m_dreg_interface.unavailable_p ())) |
| 2708 | return; |
| 2709 | |
| 2710 | ptid_t pid_ptid (pid, 0, 0); |
| 2711 | |
| 2712 | m_process_info.erase (pid); |
| 2713 | |
| 2714 | if (m_dreg_interface.hwdebug_p ()) |
| 2715 | { |
| 2716 | for (auto it = m_installed_hw_bps.begin (); |
| 2717 | it != m_installed_hw_bps.end ();) |
| 2718 | { |
| 2719 | if (it->first.matches (pid_ptid)) |
| 2720 | it = m_installed_hw_bps.erase (it); |
| 2721 | else |
| 2722 | it++; |
| 2723 | } |
| 2724 | } |
| 2725 | } |
| 2726 | |
| 2727 | /* Copy the per-process state associated with the pid of PARENT to the |
| 2728 | sate of CHILD_PID. GDB expects that a forked process will have the |
| 2729 | same hardware breakpoints and watchpoints as the parent. |
| 2730 | |
| 2731 | If we're using the HWDEBUG interface, also copy the thread debug |
| 2732 | register state for the ptid of PARENT to the state for CHILD_PID. |
| 2733 | |
| 2734 | Like for clone events, we assume the kernel will copy the debug |
| 2735 | registers from the parent thread to the child. The |
| 2736 | low_prepare_to_resume function is made to work even if it doesn't. |
| 2737 | |
| 2738 | We copy the thread state here and not in low_new_thread since we don't |
| 2739 | have the pid of the parent in low_new_thread. Even if we did, |
| 2740 | low_new_thread might not be called immediately after the fork event is |
| 2741 | detected. For instance, with the checkpointing system (see |
| 2742 | linux-fork.c), the thread won't be added until GDB decides to switch |
| 2743 | to a new checkpointed process. At that point, the debug register |
| 2744 | state of the parent thread is unlikely to correspond to the state it |
| 2745 | had at the point when it forked. */ |
| 2746 | |
| 2747 | void |
| 2748 | ppc_linux_nat_target::low_new_fork (struct lwp_info *parent, |
| 2749 | pid_t child_pid) |
| 2750 | { |
| 2751 | if ((!m_dreg_interface.detected_p ()) |
| 2752 | || (m_dreg_interface.unavailable_p ())) |
| 2753 | return; |
| 2754 | |
| 2755 | auto process_it = m_process_info.find (parent->ptid.pid ()); |
| 2756 | |
| 2757 | if (process_it != m_process_info.end ()) |
| 2758 | m_process_info[child_pid] = m_process_info[parent->ptid.pid ()]; |
| 2759 | |
| 2760 | if (m_dreg_interface.hwdebug_p ()) |
| 2761 | { |
| 2762 | ptid_t child_ptid (child_pid, child_pid, 0); |
| 2763 | |
| 2764 | copy_thread_dreg_state (parent->ptid, child_ptid); |
| 2765 | } |
| 2766 | } |
| 2767 | |
| 2768 | /* Copy the thread debug register state from the PARENT thread to the the |
| 2769 | state for CHILD_LWP, if we're using the HWDEBUG interface. We assume |
| 2770 | the kernel copies the debug registers from one thread to another after |
| 2771 | a clone event. The low_prepare_to_resume function is made to work |
| 2772 | even if it doesn't. */ |
| 2773 | |
| 2774 | void |
| 2775 | ppc_linux_nat_target::low_new_clone (struct lwp_info *parent, |
| 2776 | pid_t child_lwp) |
| 2777 | { |
| 2778 | if ((!m_dreg_interface.detected_p ()) |
| 2779 | || (m_dreg_interface.unavailable_p ())) |
| 2780 | return; |
| 2781 | |
| 2782 | if (m_dreg_interface.hwdebug_p ()) |
| 2783 | { |
| 2784 | ptid_t child_ptid (parent->ptid.pid (), child_lwp, 0); |
| 2785 | |
| 2786 | copy_thread_dreg_state (parent->ptid, child_ptid); |
| 2787 | } |
| 2788 | } |
| 2789 | |
| 2790 | /* Initialize the arch-specific thread state for LP so that it contains |
| 2791 | the ptid for lp, so that we can use it in low_delete_thread. Mark the |
| 2792 | new thread LP as stale so that we update its debug registers before |
| 2793 | resuming it. This is not called for the initial thread. */ |
| 2794 | |
| 2795 | void |
| 2796 | ppc_linux_nat_target::low_new_thread (struct lwp_info *lp) |
| 2797 | { |
| 2798 | init_arch_lwp_info (lp); |
| 2799 | |
| 2800 | mark_thread_stale (lp); |
| 2801 | } |
| 2802 | |
| 2803 | /* Delete the per-thread debug register stale flag. */ |
| 2804 | |
| 2805 | void |
| 2806 | ppc_linux_nat_target::low_delete_thread (struct arch_lwp_info |
| 2807 | *lp_arch_info) |
| 2808 | { |
| 2809 | if (lp_arch_info != NULL) |
| 2810 | { |
| 2811 | if (m_dreg_interface.detected_p () |
| 2812 | && m_dreg_interface.hwdebug_p ()) |
| 2813 | m_installed_hw_bps.erase (lp_arch_info->lwp_ptid); |
| 2814 | |
| 2815 | xfree (lp_arch_info); |
| 2816 | } |
| 2817 | } |
| 2818 | |
| 2819 | /* Install or delete debug registers in thread LP so that it matches what |
| 2820 | GDB requested before it is resumed. */ |
| 2821 | |
| 2822 | void |
| 2823 | ppc_linux_nat_target::low_prepare_to_resume (struct lwp_info *lp) |
| 2824 | { |
| 2825 | if ((!m_dreg_interface.detected_p ()) |
| 2826 | || (m_dreg_interface.unavailable_p ())) |
| 2827 | return; |
| 2828 | |
| 2829 | /* We have to re-install or clear the debug registers if we set the |
| 2830 | stale flag. |
| 2831 | |
| 2832 | In addition, some kernels configurations can disable a hardware |
| 2833 | watchpoint after it is hit. Usually, GDB will remove and re-install |
| 2834 | a hardware watchpoint when the thread stops if "breakpoint |
| 2835 | always-inserted" is off, or to single-step a watchpoint. But so |
| 2836 | that we don't rely on this behavior, if we stop due to a hardware |
| 2837 | breakpoint or watchpoint, we also refresh our debug registers. */ |
| 2838 | |
| 2839 | arch_lwp_info *lp_arch_info = get_arch_lwp_info (lp); |
| 2840 | |
| 2841 | bool stale_dregs = (lp->stop_reason == TARGET_STOPPED_BY_WATCHPOINT |
| 2842 | || lp->stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT |
| 2843 | || lp_arch_info->debug_regs_stale); |
| 2844 | |
| 2845 | if (!stale_dregs) |
| 2846 | return; |
| 2847 | |
| 2848 | gdb_assert (lp->ptid.lwp_p ()); |
| 2849 | |
| 2850 | auto process_it = m_process_info.find (lp->ptid.pid ()); |
| 2851 | |
| 2852 | if (m_dreg_interface.hwdebug_p ()) |
| 2853 | { |
| 2854 | /* First, delete any hardware watchpoint or breakpoint installed in |
| 2855 | the inferior and update the thread state. */ |
| 2856 | auto installed_it = m_installed_hw_bps.find (lp->ptid); |
| 2857 | |
| 2858 | if (installed_it != m_installed_hw_bps.end ()) |
| 2859 | { |
| 2860 | auto &bp_list = installed_it->second; |
| 2861 | |
| 2862 | for (auto bp_it = bp_list.begin (); bp_it != bp_list.end ();) |
| 2863 | { |
| 2864 | /* We ignore ENOENT to account for various possible kernel |
| 2865 | behaviors, e.g. the kernel might or might not copy debug |
| 2866 | registers across forks and clones, and we always copy |
| 2867 | the debug register state when fork and clone events are |
| 2868 | detected. */ |
| 2869 | if (ptrace (PPC_PTRACE_DELHWDEBUG, lp->ptid.lwp (), 0, |
| 2870 | bp_it->first) == -1) |
| 2871 | if (errno != ENOENT) |
| 2872 | perror_with_name (_("Error deleting hardware " |
| 2873 | "breakpoint or watchpoint")); |
| 2874 | |
| 2875 | /* We erase the entries one at a time after successfuly |
| 2876 | removing the corresponding slot form the thread so that |
| 2877 | if we throw an exception above in a future iteration the |
| 2878 | map remains consistent. */ |
| 2879 | bp_it = bp_list.erase (bp_it); |
| 2880 | } |
| 2881 | |
| 2882 | gdb_assert (bp_list.empty ()); |
| 2883 | } |
| 2884 | |
| 2885 | /* Now we install all the requested hardware breakpoints and |
| 2886 | watchpoints and update the thread state. */ |
| 2887 | |
| 2888 | if (process_it != m_process_info.end ()) |
| 2889 | { |
| 2890 | auto &bp_list = m_installed_hw_bps[lp->ptid]; |
| 2891 | |
| 2892 | for (ppc_hw_breakpoint bp |
| 2893 | : process_it->second.requested_hw_bps) |
| 2894 | { |
| 2895 | long slot = ptrace (PPC_PTRACE_SETHWDEBUG, lp->ptid.lwp (), |
| 2896 | 0, &bp); |
| 2897 | |
| 2898 | if (slot < 0) |
| 2899 | perror_with_name (_("Error setting hardware " |
| 2900 | "breakpoint or watchpoint")); |
| 2901 | |
| 2902 | /* Keep track of which slots we installed in this |
| 2903 | thread. */ |
| 2904 | bp_list.emplace (bp_list.begin (), slot, bp); |
| 2905 | } |
| 2906 | } |
| 2907 | } |
| 2908 | else |
| 2909 | { |
| 2910 | gdb_assert (m_dreg_interface.debugreg_p ()); |
| 2911 | |
| 2912 | /* Passing 0 to PTRACE_SET_DEBUGREG will clear the |
| 2913 | watchpoint. */ |
| 2914 | long wp = 0; |
| 2915 | |
| 2916 | /* GDB requested a watchpoint to be installed. */ |
| 2917 | if (process_it != m_process_info.end () |
| 2918 | && process_it->second.requested_wp_val.has_value ()) |
| 2919 | wp = *(process_it->second.requested_wp_val); |
| 2920 | |
| 2921 | long ret = ptrace (PTRACE_SET_DEBUGREG, lp->ptid.lwp (), |
| 2922 | 0, wp); |
| 2923 | |
| 2924 | if (ret == -1) |
| 2925 | perror_with_name (_("Error setting hardware watchpoint")); |
| 2926 | } |
| 2927 | |
| 2928 | lp_arch_info->debug_regs_stale = false; |
| 2929 | } |
| 2930 | |
| 2931 | /* Return true if INFERIOR_PTID is known to have been stopped by a |
| 2932 | hardware watchpoint, false otherwise. If true is returned, write the |
| 2933 | address that the kernel reported as causing the SIGTRAP in ADDR_P. */ |
| 2934 | |
| 2935 | bool |
| 2936 | ppc_linux_nat_target::low_stopped_data_address (CORE_ADDR *addr_p) |
| 2937 | { |
| 2938 | siginfo_t siginfo; |
| 2939 | |
| 2940 | if (!linux_nat_get_siginfo (inferior_ptid, &siginfo)) |
| 2941 | return false; |
| 2942 | |
| 2943 | if (siginfo.si_signo != SIGTRAP |
| 2944 | || (siginfo.si_code & 0xffff) != 0x0004 /* TRAP_HWBKPT */) |
| 2945 | return false; |
| 2946 | |
| 2947 | gdb_assert (!m_dreg_interface.unavailable_p ()); |
| 2948 | |
| 2949 | /* Check if this signal corresponds to a hardware breakpoint. We only |
| 2950 | need to check this if we're using the HWDEBUG interface, since the |
| 2951 | DEBUGREG interface only allows setting one hardware watchpoint. */ |
| 2952 | if (m_dreg_interface.hwdebug_p ()) |
| 2953 | { |
| 2954 | /* The index (or slot) of the *point is passed in the si_errno |
| 2955 | field. Currently, this is only the case if the kernel was |
| 2956 | configured with CONFIG_PPC_ADV_DEBUG_REGS. If not, we assume |
| 2957 | the kernel will set si_errno to a value that doesn't correspond |
| 2958 | to any real slot. */ |
| 2959 | int slot = siginfo.si_errno; |
| 2960 | |
| 2961 | auto installed_it = m_installed_hw_bps.find (inferior_ptid); |
| 2962 | |
| 2963 | /* We must have installed slots for the thread if it got a |
| 2964 | TRAP_HWBKPT signal. */ |
| 2965 | gdb_assert (installed_it != m_installed_hw_bps.end ()); |
| 2966 | |
| 2967 | for (const auto & slot_bp_pair : installed_it->second) |
| 2968 | if (slot_bp_pair.first == slot |
| 2969 | && (slot_bp_pair.second.trigger_type |
| 2970 | == PPC_BREAKPOINT_TRIGGER_EXECUTE)) |
| 2971 | return false; |
| 2972 | } |
| 2973 | |
| 2974 | *addr_p = (CORE_ADDR) (uintptr_t) siginfo.si_addr; |
| 2975 | return true; |
| 2976 | } |
| 2977 | |
| 2978 | /* Return true if INFERIOR_PTID is known to have been stopped by a |
| 2979 | hardware watchpoint, false otherwise. */ |
| 2980 | |
| 2981 | bool |
| 2982 | ppc_linux_nat_target::low_stopped_by_watchpoint () |
| 2983 | { |
| 2984 | CORE_ADDR addr; |
| 2985 | return low_stopped_data_address (&addr); |
| 2986 | } |
| 2987 | |
| 2988 | bool |
| 2989 | ppc_linux_nat_target::watchpoint_addr_within_range (CORE_ADDR addr, |
| 2990 | CORE_ADDR start, |
| 2991 | int length) |
| 2992 | { |
| 2993 | gdb_assert (!m_dreg_interface.unavailable_p ()); |
| 2994 | |
| 2995 | int mask; |
| 2996 | |
| 2997 | if (m_dreg_interface.hwdebug_p () |
| 2998 | && linux_get_hwcap (current_top_target ()) & PPC_FEATURE_BOOKE) |
| 2999 | return start <= addr && start + length >= addr; |
| 3000 | else if (linux_get_hwcap (current_top_target ()) & PPC_FEATURE_BOOKE) |
| 3001 | mask = 3; |
| 3002 | else |
| 3003 | mask = 7; |
| 3004 | |
| 3005 | addr &= ~mask; |
| 3006 | |
| 3007 | /* Check whether [start, start+length-1] intersects [addr, addr+mask]. */ |
| 3008 | return start <= addr + mask && start + length - 1 >= addr; |
| 3009 | } |
| 3010 | |
| 3011 | /* Return the number of registers needed for a masked hardware watchpoint. */ |
| 3012 | |
| 3013 | int |
| 3014 | ppc_linux_nat_target::masked_watch_num_registers (CORE_ADDR addr, |
| 3015 | CORE_ADDR mask) |
| 3016 | { |
| 3017 | m_dreg_interface.detect (inferior_ptid); |
| 3018 | |
| 3019 | if (!m_dreg_interface.hwdebug_p () |
| 3020 | || (m_dreg_interface.hwdebug_info ().features |
| 3021 | & PPC_DEBUG_FEATURE_DATA_BP_MASK) == 0) |
| 3022 | return -1; |
| 3023 | else if ((mask & 0xC0000000) != 0xC0000000) |
| 3024 | { |
| 3025 | warning (_("The given mask covers kernel address space " |
| 3026 | "and cannot be used.\n")); |
| 3027 | |
| 3028 | return -2; |
| 3029 | } |
| 3030 | else |
| 3031 | return 2; |
| 3032 | } |
| 3033 | |
| 3034 | /* Copy the per-thread debug register state, if any, from thread |
| 3035 | PARENT_PTID to thread CHILD_PTID, if the debug register being used is |
| 3036 | HWDEBUG. */ |
| 3037 | |
| 3038 | void |
| 3039 | ppc_linux_nat_target::copy_thread_dreg_state (const ptid_t &parent_ptid, |
| 3040 | const ptid_t &child_ptid) |
| 3041 | { |
| 3042 | gdb_assert (m_dreg_interface.hwdebug_p ()); |
| 3043 | |
| 3044 | auto installed_it = m_installed_hw_bps.find (parent_ptid); |
| 3045 | |
| 3046 | if (installed_it != m_installed_hw_bps.end ()) |
| 3047 | m_installed_hw_bps[child_ptid] = m_installed_hw_bps[parent_ptid]; |
| 3048 | } |
| 3049 | |
| 3050 | /* Mark the debug register stale flag for the new thread, if we have |
| 3051 | already detected which debug register interface we use. */ |
| 3052 | |
| 3053 | void |
| 3054 | ppc_linux_nat_target::mark_thread_stale (struct lwp_info *lp) |
| 3055 | { |
| 3056 | if ((!m_dreg_interface.detected_p ()) |
| 3057 | || (m_dreg_interface.unavailable_p ())) |
| 3058 | return; |
| 3059 | |
| 3060 | arch_lwp_info *lp_arch_info = get_arch_lwp_info (lp); |
| 3061 | |
| 3062 | lp_arch_info->debug_regs_stale = true; |
| 3063 | } |
| 3064 | |
| 3065 | /* Mark all the threads of the group of PID as stale with respect to |
| 3066 | debug registers and issue a stop request to each such thread that |
| 3067 | isn't already stopped. */ |
| 3068 | |
| 3069 | void |
| 3070 | ppc_linux_nat_target::mark_debug_registers_changed (pid_t pid) |
| 3071 | { |
| 3072 | /* We do this in two passes to make sure all threads are marked even if |
| 3073 | we get an exception when stopping one of them. */ |
| 3074 | |
| 3075 | iterate_over_lwps (ptid_t (pid), |
| 3076 | [this] (struct lwp_info *lp) -> int { |
| 3077 | this->mark_thread_stale (lp); |
| 3078 | return 0; |
| 3079 | }); |
| 3080 | |
| 3081 | iterate_over_lwps (ptid_t (pid), |
| 3082 | [] (struct lwp_info *lp) -> int { |
| 3083 | if (!lwp_is_stopped (lp)) |
| 3084 | linux_stop_lwp (lp); |
| 3085 | return 0; |
| 3086 | }); |
| 3087 | } |
| 3088 | |
| 3089 | /* Register a hardware breakpoint or watchpoint BP for the pid PID, then |
| 3090 | mark the stale flag for all threads of the group of PID, and issue a |
| 3091 | stop request for them. The breakpoint or watchpoint will be installed |
| 3092 | the next time each thread is resumed. Should only be used if the |
| 3093 | debug register interface is HWDEBUG. */ |
| 3094 | |
| 3095 | void |
| 3096 | ppc_linux_nat_target::register_hw_breakpoint (pid_t pid, |
| 3097 | const struct |
| 3098 | ppc_hw_breakpoint &bp) |
| 3099 | { |
| 3100 | gdb_assert (m_dreg_interface.hwdebug_p ()); |
| 3101 | |
| 3102 | m_process_info[pid].requested_hw_bps.push_back (bp); |
| 3103 | |
| 3104 | mark_debug_registers_changed (pid); |
| 3105 | } |
| 3106 | |
| 3107 | /* Clear a registration for a hardware breakpoint or watchpoint BP for |
| 3108 | the pid PID, then mark the stale flag for all threads of the group of |
| 3109 | PID, and issue a stop request for them. The breakpoint or watchpoint |
| 3110 | will be removed the next time each thread is resumed. Should only be |
| 3111 | used if the debug register interface is HWDEBUG. */ |
| 3112 | |
| 3113 | void |
| 3114 | ppc_linux_nat_target::clear_hw_breakpoint (pid_t pid, |
| 3115 | const struct ppc_hw_breakpoint &bp) |
| 3116 | { |
| 3117 | gdb_assert (m_dreg_interface.hwdebug_p ()); |
| 3118 | |
| 3119 | auto process_it = m_process_info.find (pid); |
| 3120 | |
| 3121 | gdb_assert (process_it != m_process_info.end ()); |
| 3122 | |
| 3123 | auto bp_it = std::find_if (process_it->second.requested_hw_bps.begin (), |
| 3124 | process_it->second.requested_hw_bps.end (), |
| 3125 | [&bp, this] |
| 3126 | (const struct ppc_hw_breakpoint &curr) |
| 3127 | { return hwdebug_point_cmp (bp, curr); } |
| 3128 | ); |
| 3129 | |
| 3130 | /* If GDB is removing a watchpoint, it must have been inserted. */ |
| 3131 | gdb_assert (bp_it != process_it->second.requested_hw_bps.end ()); |
| 3132 | |
| 3133 | process_it->second.requested_hw_bps.erase (bp_it); |
| 3134 | |
| 3135 | mark_debug_registers_changed (pid); |
| 3136 | } |
| 3137 | |
| 3138 | /* Register the hardware watchpoint value WP_VALUE for the pid PID, |
| 3139 | then mark the stale flag for all threads of the group of PID, and |
| 3140 | issue a stop request for them. The breakpoint or watchpoint will be |
| 3141 | installed the next time each thread is resumed. Should only be used |
| 3142 | if the debug register interface is DEBUGREG. */ |
| 3143 | |
| 3144 | void |
| 3145 | ppc_linux_nat_target::register_wp (pid_t pid, long wp_value) |
| 3146 | { |
| 3147 | gdb_assert (m_dreg_interface.debugreg_p ()); |
| 3148 | |
| 3149 | /* Our other functions should have told GDB that we only have one |
| 3150 | hardware watchpoint with this interface. */ |
| 3151 | gdb_assert (!m_process_info[pid].requested_wp_val.has_value ()); |
| 3152 | |
| 3153 | m_process_info[pid].requested_wp_val.emplace (wp_value); |
| 3154 | |
| 3155 | mark_debug_registers_changed (pid); |
| 3156 | } |
| 3157 | |
| 3158 | /* Clear the hardware watchpoint registration for the pid PID, then mark |
| 3159 | the stale flag for all threads of the group of PID, and issue a stop |
| 3160 | request for them. The breakpoint or watchpoint will be installed the |
| 3161 | next time each thread is resumed. Should only be used if the debug |
| 3162 | register interface is DEBUGREG. */ |
| 3163 | |
| 3164 | void |
| 3165 | ppc_linux_nat_target::clear_wp (pid_t pid) |
| 3166 | { |
| 3167 | gdb_assert (m_dreg_interface.debugreg_p ()); |
| 3168 | |
| 3169 | auto process_it = m_process_info.find (pid); |
| 3170 | |
| 3171 | gdb_assert (process_it != m_process_info.end ()); |
| 3172 | gdb_assert (process_it->second.requested_wp_val.has_value ()); |
| 3173 | |
| 3174 | process_it->second.requested_wp_val.reset (); |
| 3175 | |
| 3176 | mark_debug_registers_changed (pid); |
| 3177 | } |
| 3178 | |
| 3179 | /* Initialize the arch-specific thread state for LWP, if it not already |
| 3180 | created. */ |
| 3181 | |
| 3182 | void |
| 3183 | ppc_linux_nat_target::init_arch_lwp_info (struct lwp_info *lp) |
| 3184 | { |
| 3185 | if (lwp_arch_private_info (lp) == NULL) |
| 3186 | { |
| 3187 | lwp_set_arch_private_info (lp, XCNEW (struct arch_lwp_info)); |
| 3188 | lwp_arch_private_info (lp)->debug_regs_stale = false; |
| 3189 | lwp_arch_private_info (lp)->lwp_ptid = lp->ptid; |
| 3190 | } |
| 3191 | } |
| 3192 | |
| 3193 | /* Get the arch-specific thread state for LWP, creating it if |
| 3194 | necessary. */ |
| 3195 | |
| 3196 | arch_lwp_info * |
| 3197 | ppc_linux_nat_target::get_arch_lwp_info (struct lwp_info *lp) |
| 3198 | { |
| 3199 | init_arch_lwp_info (lp); |
| 3200 | |
| 3201 | return lwp_arch_private_info (lp); |
| 3202 | } |
| 3203 | |
| 3204 | void _initialize_ppc_linux_nat (); |
| 3205 | void |
| 3206 | _initialize_ppc_linux_nat () |
| 3207 | { |
| 3208 | linux_target = &the_ppc_linux_nat_target; |
| 3209 | |
| 3210 | /* Register the target. */ |
| 3211 | add_inf_child_target (linux_target); |
| 3212 | } |