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   CORE_ADDR (*get_pc) (struct regcache *regcache);
  85   void (*set_pc) (struct regcache *regcache, CORE_ADDR newpc);
  86   const unsigned char *breakpoint;
  87   int breakpoint_len;
  88   CORE_ADDR (*breakpoint_reinsert_addr) (void);
  89
  90   int decr_pc_after_break;
  91   int (*breakpoint_at) (CORE_ADDR pc);
  92
  93   /* Breakpoint and watchpoint related functions.  See target.h for
  94      comments.  */
  95   int (*insert_point) (char type, CORE_ADDR addr, int len);
  96   int (*remove_point) (char type, CORE_ADDR addr, int len);
  97   int (*stopped_by_watchpoint) (void);
  98   CORE_ADDR (*stopped_data_address) (void);
  99
 100   /* Hooks to reformat register data for PEEKUSR/POKEUSR (in particular
 101      for registers smaller than an xfer unit).  */
 102   void (*collect_ptrace_register) (struct regcache *regcache,
 103                                    int regno, char *buf);
 104   void (*supply_ptrace_register) (struct regcache *regcache,
 105                                   int regno, const char *buf);
 106
 107   /* Hook to convert from target format to ptrace format and back.
 108      Returns true if any conversion was done; false otherwise.
 109      If DIRECTION is 1, then copy from INF to NATIVE.
 110      If DIRECTION is 0, copy from NATIVE to INF.  */
 111   int (*siginfo_fixup) (siginfo_t *native, void *inf, int direction);
 112
 113   /* Hook to call when a new process is created or attached to.
 114      If extra per-process architecture-specific data is needed,
 115      allocate it here.  */
 116   struct arch_process_info * (*new_process) (void);
 117
 118   /* Hook to call when a new thread is detected.
 119      If extra per-thread architecture-specific data is needed,
 120      allocate it here.  */
 121   struct arch_lwp_info * (*new_thread) (void);
 122
 123   /* Hook to call prior to resuming a thread.  */
 124   void (*prepare_to_resume) (struct lwp_info *);
 125
 126   /* Hook to support target specific qSupported.  */
 127   void (*process_qsupported) (const char *);
 128
 129   /* Returns true if the low target supports tracepoints.  */
 130   int (*supports_tracepoints) (void);
 131
 132   /* Fill ADDRP with the thread area address of LWPID.  Returns 0 on
 133      success, -1 on failure.  */
 134   int (*get_thread_area) (int lwpid, CORE_ADDR *addrp);
 135
 136   /* Install a fast tracepoint jump pad.  See target.h for
 137      comments.  */
 138   int (*install_fast_tracepoint_jump_pad) (CORE_ADDR tpoint, CORE_ADDR tpaddr,
 139                                            CORE_ADDR collector,
 140                                            CORE_ADDR lockaddr,
 141                                            ULONGEST orig_size,
 142                                            CORE_ADDR *jump_entry,
 143                                            CORE_ADDR *trampoline,
 144                                            ULONGEST *trampoline_size,
 145                                            unsigned char *jjump_pad_insn,
 146                                            ULONGEST *jjump_pad_insn_size,
 147                                            CORE_ADDR *adjusted_insn_addr,
 148                                            CORE_ADDR *adjusted_insn_addr_end,
 149                                            char *err);
 150
 151   /* Return the bytecode operations vector for the current inferior.
 152      Returns NULL if bytecode compilation is not supported.  */
 153   struct emit_ops *(*emit_ops) (void);
 154
 155   /* Return the minimum length of an instruction that can be safely overwritten
 156      for use as a fast tracepoint.  */
 157   int (*get_min_fast_tracepoint_insn_len) (void);
 158
 159 };
 160
 161 extern struct linux_target_ops the_low_target;
 162
 163 #define ptid_of(proc) ((proc)->head.id)
 164 #define pid_of(proc) ptid_get_pid ((proc)->head.id)
 165 #define lwpid_of(proc) ptid_get_lwp ((proc)->head.id)
 166
 167 #define get_lwp(inf) ((struct lwp_info *)(inf))
 168 #define get_thread_lwp(thr) (get_lwp (inferior_target_data (thr)))
 169 #define get_lwp_thread(proc) ((struct thread_info *)                    \
 170                               find_inferior_id (&all_threads,           \
 171                                                 get_lwp (proc)->head.id))
 172
 173 struct lwp_info
 174 {
 175   struct inferior_list_entry head;
 176
 177   /* If this flag is set, the next SIGSTOP will be ignored (the
 178      process will be immediately resumed).  This means that either we
 179      sent the SIGSTOP to it ourselves and got some other pending event
 180      (so the SIGSTOP is still pending), or that we stopped the
 181      inferior implicitly via PTRACE_ATTACH and have not waited for it
 182      yet.  */
 183   int stop_expected;
 184
 185   /* When this is true, we shall not try to resume this thread, even
 186      if last_resume_kind isn't resume_stop.  */
 187   int suspended;
 188
 189   /* If this flag is set, the lwp is known to be stopped right now (stop
 190      event already received in a wait()).  */
 191   int stopped;
 192
 193   /* If this flag is set, the lwp is known to be dead already (exit
 194      event already received in a wait(), and is cached in
 195      status_pending).  */
 196   int dead;
 197
 198   /* When stopped is set, the last wait status recorded for this lwp.  */
 199   int last_status;
 200
 201   /* When stopped is set, this is where the lwp stopped, with
 202      decr_pc_after_break already accounted for.  */
 203   CORE_ADDR stop_pc;
 204
 205   /* If this flag is set, STATUS_PENDING is a waitstatus that has not yet
 206      been reported.  */
 207   int status_pending_p;
 208   int status_pending;
 209
 210   /* STOPPED_BY_WATCHPOINT is non-zero if this LWP stopped with a data
 211      watchpoint trap.  */
 212   int stopped_by_watchpoint;
 213
 214   /* On architectures where it is possible to know the data address of
 215      a triggered watchpoint, STOPPED_DATA_ADDRESS is non-zero, and
 216      contains such data address.  Only valid if STOPPED_BY_WATCHPOINT
 217      is true.  */
 218   CORE_ADDR stopped_data_address;
 219
 220   /* If this is non-zero, it is a breakpoint to be reinserted at our next
 221      stop (SIGTRAP stops only).  */
 222   CORE_ADDR bp_reinsert;
 223
 224   /* If this flag is set, the last continue operation at the ptrace
 225      level on this process was a single-step.  */
 226   int stepping;
 227
 228   /* If this flag is set, we need to set the event request flags the
 229      next time we see this LWP stop.  */
 230   int must_set_ptrace_flags;
 231
 232   /* If this is non-zero, it points to a chain of signals which need to
 233      be delivered to this process.  */
 234   struct pending_signals *pending_signals;
 235
 236   /* A link used when resuming.  It is initialized from the resume request,
 237      and then processed and cleared in linux_resume_one_lwp.  */
 238   struct thread_resume *resume;
 239
 240   /* True if it is known that this lwp is presently collecting a fast
 241      tracepoint (it is in the jump pad or in some code that will
 242      return to the jump pad.  Normally, we won't care about this, but
 243      we will if a signal arrives to this lwp while it is
 244      collecting.  */
 245   int collecting_fast_tracepoint;
 246
 247   /* If this is non-zero, it points to a chain of signals which need
 248      to be reported to GDB.  These were deferred because the thread
 249      was doing a fast tracepoint collect when they arrived.  */
 250   struct pending_signals *pending_signals_to_report;
 251
 252   /* When collecting_fast_tracepoint is first found to be 1, we insert
 253      a exit-jump-pad-quickly breakpoint.  This is it.  */
 254   struct breakpoint *exit_jump_pad_bkpt;
 255
 256   /* True if the LWP was seen stop at an internal breakpoint and needs
 257      stepping over later when it is resumed.  */
 258   int need_step_over;
 259
 260   int thread_known;
 261 #ifdef HAVE_THREAD_DB_H
 262   /* The thread handle, used for e.g. TLS access.  Only valid if
 263      THREAD_KNOWN is set.  */
 264   td_thrhandle_t th;
 265 #endif
 266
 267   /* Arch-specific additions.  */
 268   struct arch_lwp_info *arch_private;
 269 };
 270
 271 extern struct inferior_list all_lwps;
 272
 273 int linux_pid_exe_is_elf_64_file (int pid);
 274
 275 void linux_attach_lwp (unsigned long pid);
 276 struct lwp_info *find_lwp_pid (ptid_t ptid);
 277 void linux_stop_lwp (struct lwp_info *lwp);
 278
 279 /* From thread-db.c  */
 280 int thread_db_init (int use_events);
 281 void thread_db_detach (struct process_info *);
 282 void thread_db_mourn (struct process_info *);
 283 int thread_db_handle_monitor_command (char *);
 284 int thread_db_get_tls_address (struct thread_info *thread, CORE_ADDR offset,
 285                                CORE_ADDR load_module, CORE_ADDR *address);
 286 int thread_db_look_up_one_symbol (const char *name, CORE_ADDR *addrp);