gdb/gdbserver/linux-low.h

   1 /* Internal interfaces for the GNU/Linux specific target code for gdbserver.
   2    Copyright (C) 2002, 2004-2005, 2007-2012 Free Software Foundation,
   3    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 #ifdef HAVE_THREAD_DB_H
  21 #include <thread_db.h>
  22 #endif
  23 #include <signal.h>
  24
  25 #include "gdb_proc_service.h"
  26
  27 #ifdef HAVE_LINUX_REGSETS
  28 typedef void (*regset_fill_func) (struct regcache *, void *);
  29 typedef void (*regset_store_func) (struct regcache *, const void *);
  30 enum regset_type {
  31   GENERAL_REGS,
  32   FP_REGS,
  33   EXTENDED_REGS,
  34 };
  35
  36 struct regset_info
  37 {
  38   int get_request, set_request;
  39   /* If NT_TYPE isn't 0, it will be passed to ptrace as the 3rd
  40      argument and the 4th argument should be "const struct iovec *".  */
  41   int nt_type;
  42   int size;
  43   enum regset_type type;
  44   regset_fill_func fill_function;
  45   regset_store_func store_function;
  46 };
  47 extern struct regset_info target_regsets[];
  48 #endif
  49
  50 struct process_info_private
  51 {
  52   /* Arch-specific additions.  */
  53   struct arch_process_info *arch_private;
  54
  55   /* libthread_db-specific additions.  Not NULL if this process has loaded
  56      thread_db, and it is active.  */
  57   struct thread_db *thread_db;
  58
  59   /* &_r_debug.  0 if not yet determined.  -1 if no PT_DYNAMIC in Phdrs.  */
  60   CORE_ADDR r_debug;
  61 };
  62
  63 struct lwp_info;
  64
  65 struct linux_target_ops
  66 {
  67   /* Architecture-specific setup.  */
  68   void (*arch_setup) (void);
  69
  70   int num_regs;
  71   int *regmap;
  72
  73   /* Regset support bitmap: 1 for registers that are transferred as a part
  74      of a regset, 0 for ones that need to be handled individually.  This
  75      can be NULL if all registers are transferred with regsets or regsets
  76      are not supported.  */
  77   unsigned char *regset_bitmap;
  78   int (*cannot_fetch_register) (int);
  79
  80   /* Returns 0 if we can store the register, 1 if we can not
  81      store the register, and 2 if failure to store the register
  82      is acceptable.  */
  83   int (*cannot_store_register) (int);
  84
  85   /* Hook to fetch a register in some non-standard way.  Used for
  86      example by backends that have read-only registers with hardcoded
  87      values (e.g., IA64's gr0/fr0/fr1).  Returns true if register
  88      REGNO was supplied, false if not, and we should fallback to the
  89      standard ptrace methods.  */
  90   int (*fetch_register) (struct regcache *regcache, int regno);
  91
  92   CORE_ADDR (*get_pc) (struct regcache *regcache);
  93   void (*set_pc) (struct regcache *regcache, CORE_ADDR newpc);
  94   const unsigned char *breakpoint;
  95   int breakpoint_len;
  96   CORE_ADDR (*breakpoint_reinsert_addr) (void);
  97
  98   int decr_pc_after_break;
  99   int (*breakpoint_at) (CORE_ADDR pc);
 100
 101   /* Breakpoint and watchpoint related functions.  See target.h for
 102      comments.  */
 103   int (*insert_point) (char type, CORE_ADDR addr, int len);
 104   int (*remove_point) (char type, CORE_ADDR addr, int len);
 105   int (*stopped_by_watchpoint) (void);
 106   CORE_ADDR (*stopped_data_address) (void);
 107
 108   /* Hooks to reformat register data for PEEKUSR/POKEUSR (in particular
 109      for registers smaller than an xfer unit).  */
 110   void (*collect_ptrace_register) (struct regcache *regcache,
 111                                    int regno, char *buf);
 112   void (*supply_ptrace_register) (struct regcache *regcache,
 113                                   int regno, const char *buf);
 114
 115   /* Hook to convert from target format to ptrace format and back.
 116      Returns true if any conversion was done; false otherwise.
 117      If DIRECTION is 1, then copy from INF to NATIVE.
 118      If DIRECTION is 0, copy from NATIVE to INF.  */
 119   int (*siginfo_fixup) (siginfo_t *native, void *inf, int direction);
 120
 121   /* Hook to call when a new process is created or attached to.
 122      If extra per-process architecture-specific data is needed,
 123      allocate it here.  */
 124   struct arch_process_info * (*new_process) (void);
 125
 126   /* Hook to call when a new thread is detected.
 127      If extra per-thread architecture-specific data is needed,
 128      allocate it here.  */
 129   struct arch_lwp_info * (*new_thread) (void);
 130
 131   /* Hook to call prior to resuming a thread.  */
 132   void (*prepare_to_resume) (struct lwp_info *);
 133
 134   /* Hook to support target specific qSupported.  */
 135   void (*process_qsupported) (const char *);
 136
 137   /* Returns true if the low target supports tracepoints.  */
 138   int (*supports_tracepoints) (void);
 139
 140   /* Fill ADDRP with the thread area address of LWPID.  Returns 0 on
 141      success, -1 on failure.  */
 142   int (*get_thread_area) (int lwpid, CORE_ADDR *addrp);
 143
 144   /* Install a fast tracepoint jump pad.  See target.h for
 145      comments.  */
 146   int (*install_fast_tracepoint_jump_pad) (CORE_ADDR tpoint, CORE_ADDR tpaddr,
 147                                            CORE_ADDR collector,
 148                                            CORE_ADDR lockaddr,
 149                                            ULONGEST orig_size,
 150                                            CORE_ADDR *jump_entry,
 151                                            CORE_ADDR *trampoline,
 152                                            ULONGEST *trampoline_size,
 153                                            unsigned char *jjump_pad_insn,
 154                                            ULONGEST *jjump_pad_insn_size,
 155                                            CORE_ADDR *adjusted_insn_addr,
 156                                            CORE_ADDR *adjusted_insn_addr_end,
 157                                            char *err);
 158
 159   /* Return the bytecode operations vector for the current inferior.
 160      Returns NULL if bytecode compilation is not supported.  */
 161   struct emit_ops *(*emit_ops) (void);
 162
 163   /* Return the minimum length of an instruction that can be safely overwritten
 164      for use as a fast tracepoint.  */
 165   int (*get_min_fast_tracepoint_insn_len) (void);
 166
 167 };
 168
 169 extern struct linux_target_ops the_low_target;
 170
 171 #define ptid_of(proc) ((proc)->head.id)
 172 #define pid_of(proc) ptid_get_pid ((proc)->head.id)
 173 #define lwpid_of(proc) ptid_get_lwp ((proc)->head.id)
 174
 175 #define get_lwp(inf) ((struct lwp_info *)(inf))
 176 #define get_thread_lwp(thr) (get_lwp (inferior_target_data (thr)))
 177 #define get_lwp_thread(proc) ((struct thread_info *)                    \
 178                               find_inferior_id (&all_threads,           \
 179                                                 get_lwp (proc)->head.id))
 180
 181 struct lwp_info
 182 {
 183   struct inferior_list_entry head;
 184
 185   /* If this flag is set, the next SIGSTOP will be ignored (the
 186      process will be immediately resumed).  This means that either we
 187      sent the SIGSTOP to it ourselves and got some other pending event
 188      (so the SIGSTOP is still pending), or that we stopped the
 189      inferior implicitly via PTRACE_ATTACH and have not waited for it
 190      yet.  */
 191   int stop_expected;
 192
 193   /* When this is true, we shall not try to resume this thread, even
 194      if last_resume_kind isn't resume_stop.  */
 195   int suspended;
 196
 197   /* If this flag is set, the lwp is known to be stopped right now (stop
 198      event already received in a wait()).  */
 199   int stopped;
 200
 201   /* If this flag is set, the lwp is known to be dead already (exit
 202      event already received in a wait(), and is cached in
 203      status_pending).  */
 204   int dead;
 205
 206   /* When stopped is set, the last wait status recorded for this lwp.  */
 207   int last_status;
 208
 209   /* When stopped is set, this is where the lwp stopped, with
 210      decr_pc_after_break already accounted for.  */
 211   CORE_ADDR stop_pc;
 212
 213   /* If this flag is set, STATUS_PENDING is a waitstatus that has not yet
 214      been reported.  */
 215   int status_pending_p;
 216   int status_pending;
 217
 218   /* STOPPED_BY_WATCHPOINT is non-zero if this LWP stopped with a data
 219      watchpoint trap.  */
 220   int stopped_by_watchpoint;
 221
 222   /* On architectures where it is possible to know the data address of
 223      a triggered watchpoint, STOPPED_DATA_ADDRESS is non-zero, and
 224      contains such data address.  Only valid if STOPPED_BY_WATCHPOINT
 225      is true.  */
 226   CORE_ADDR stopped_data_address;
 227
 228   /* If this is non-zero, it is a breakpoint to be reinserted at our next
 229      stop (SIGTRAP stops only).  */
 230   CORE_ADDR bp_reinsert;
 231
 232   /* If this flag is set, the last continue operation at the ptrace
 233      level on this process was a single-step.  */
 234   int stepping;
 235
 236   /* If this flag is set, we need to set the event request flags the
 237      next time we see this LWP stop.  */
 238   int must_set_ptrace_flags;
 239
 240   /* If this is non-zero, it points to a chain of signals which need to
 241      be delivered to this process.  */
 242   struct pending_signals *pending_signals;
 243
 244   /* A link used when resuming.  It is initialized from the resume request,
 245      and then processed and cleared in linux_resume_one_lwp.  */
 246   struct thread_resume *resume;
 247
 248   /* True if it is known that this lwp is presently collecting a fast
 249      tracepoint (it is in the jump pad or in some code that will
 250      return to the jump pad.  Normally, we won't care about this, but
 251      we will if a signal arrives to this lwp while it is
 252      collecting.  */
 253   int collecting_fast_tracepoint;
 254
 255   /* If this is non-zero, it points to a chain of signals which need
 256      to be reported to GDB.  These were deferred because the thread
 257      was doing a fast tracepoint collect when they arrived.  */
 258   struct pending_signals *pending_signals_to_report;
 259
 260   /* When collecting_fast_tracepoint is first found to be 1, we insert
 261      a exit-jump-pad-quickly breakpoint.  This is it.  */
 262   struct breakpoint *exit_jump_pad_bkpt;
 263
 264   /* True if the LWP was seen stop at an internal breakpoint and needs
 265      stepping over later when it is resumed.  */
 266   int need_step_over;
 267
 268   int thread_known;
 269 #ifdef HAVE_THREAD_DB_H
 270   /* The thread handle, used for e.g. TLS access.  Only valid if
 271      THREAD_KNOWN is set.  */
 272   td_thrhandle_t th;
 273 #endif
 274
 275   /* Arch-specific additions.  */
 276   struct arch_lwp_info *arch_private;
 277 };
 278
 279 extern struct inferior_list all_lwps;
 280
 281 int linux_pid_exe_is_elf_64_file (int pid);
 282
 283 void linux_attach_lwp (unsigned long pid);
 284 struct lwp_info *find_lwp_pid (ptid_t ptid);
 285 void linux_stop_lwp (struct lwp_info *lwp);
 286
 287 /* From thread-db.c  */
 288 int thread_db_init (int use_events);
 289 void thread_db_detach (struct process_info *);
 290 void thread_db_mourn (struct process_info *);
 291 int thread_db_handle_monitor_command (char *);
 292 int thread_db_get_tls_address (struct thread_info *thread, CORE_ADDR offset,
 293                                CORE_ADDR load_module, CORE_ADDR *address);
 294 int thread_db_look_up_one_symbol (const char *name, CORE_ADDR *addrp);