gdb/gdbserver/linux-low.h

   1 /* Internal interfaces for the GNU/Linux specific target code for gdbserver.
   2    Copyright (C) 2002, 2004, 2005, 2007, 2008, 2009, 2010
   3    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 #ifdef HAVE_THREAD_DB_H
  21 #include <thread_db.h>
  22 #endif
  23
  24 #include "gdb_proc_service.h"
  25
  26 #ifdef HAVE_LINUX_REGSETS
  27 typedef void (*regset_fill_func) (struct regcache *, void *);
  28 typedef void (*regset_store_func) (struct regcache *, const void *);
  29 enum regset_type {
  30   GENERAL_REGS,
  31   FP_REGS,
  32   EXTENDED_REGS,
  33 };
  34
  35 struct regset_info
  36 {
  37   int get_request, set_request;
  38   /* If NT_TYPE isn't 0, it will be passed to ptrace as the 3rd
  39      argument and the 4th argument should be "const struct iovec *".  */
  40   int nt_type;
  41   int size;
  42   enum regset_type type;
  43   regset_fill_func fill_function;
  44   regset_store_func store_function;
  45 };
  46 extern struct regset_info target_regsets[];
  47 #endif
  48
  49 struct siginfo;
  50
  51 struct process_info_private
  52 {
  53   /* Arch-specific additions.  */
  54   struct arch_process_info *arch_private;
  55
  56   /* libthread_db-specific additions.  Not NULL if this process has loaded
  57      thread_db, and it is active.  */
  58   struct thread_db *thread_db;
  59 };
  60
  61 struct lwp_info;
  62
  63 struct linux_target_ops
  64 {
  65   /* Architecture-specific setup.  */
  66   void (*arch_setup) (void);
  67
  68   int num_regs;
  69   int *regmap;
  70   int (*cannot_fetch_register) (int);
  71
  72   /* Returns 0 if we can store the register, 1 if we can not
  73      store the register, and 2 if failure to store the register
  74      is acceptable.  */
  75   int (*cannot_store_register) (int);
  76   CORE_ADDR (*get_pc) (struct regcache *regcache);
  77   void (*set_pc) (struct regcache *regcache, CORE_ADDR newpc);
  78   const unsigned char *breakpoint;
  79   int breakpoint_len;
  80   CORE_ADDR (*breakpoint_reinsert_addr) (void);
  81
  82   int decr_pc_after_break;
  83   int (*breakpoint_at) (CORE_ADDR pc);
  84
  85   /* Breakpoint and watchpoint related functions.  See target.h for
  86      comments.  */
  87   int (*insert_point) (char type, CORE_ADDR addr, int len);
  88   int (*remove_point) (char type, CORE_ADDR addr, int len);
  89   int (*stopped_by_watchpoint) (void);
  90   CORE_ADDR (*stopped_data_address) (void);
  91
  92   /* Hooks to reformat register data for PEEKUSR/POKEUSR (in particular
  93      for registers smaller than an xfer unit).  */
  94   void (*collect_ptrace_register) (struct regcache *regcache,
  95                                    int regno, char *buf);
  96   void (*supply_ptrace_register) (struct regcache *regcache,
  97                                   int regno, const char *buf);
  98
  99   /* Hook to convert from target format to ptrace format and back.
 100      Returns true if any conversion was done; false otherwise.
 101      If DIRECTION is 1, then copy from INF to NATIVE.
 102      If DIRECTION is 0, copy from NATIVE to INF.  */
 103   int (*siginfo_fixup) (struct siginfo *native, void *inf, int direction);
 104
 105   /* Hook to call when a new process is created or attached to.
 106      If extra per-process architecture-specific data is needed,
 107      allocate it here.  */
 108   struct arch_process_info * (*new_process) (void);
 109
 110   /* Hook to call when a new thread is detected.
 111      If extra per-thread architecture-specific data is needed,
 112      allocate it here.  */
 113   struct arch_lwp_info * (*new_thread) (void);
 114
 115   /* Hook to call prior to resuming a thread.  */
 116   void (*prepare_to_resume) (struct lwp_info *);
 117
 118   /* Hook to support target specific qSupported.  */
 119   void (*process_qsupported) (const char *);
 120
 121   /* Returns true if the low target supports tracepoints.  */
 122   int (*supports_tracepoints) (void);
 123
 124   /* Fill ADDRP with the thread area address of LWPID.  Returns 0 on
 125      success, -1 on failure.  */
 126   int (*get_thread_area) (int lwpid, CORE_ADDR *addrp);
 127
 128   /* Install a fast tracepoint jump pad.  See target.h for
 129      comments.  */
 130   int (*install_fast_tracepoint_jump_pad) (CORE_ADDR tpoint, CORE_ADDR tpaddr,
 131                                            CORE_ADDR collector,
 132                                            CORE_ADDR lockaddr,
 133                                            ULONGEST orig_size,
 134                                            CORE_ADDR *jump_entry,
 135                                            unsigned char *jjump_pad_insn,
 136                                            ULONGEST *jjump_pad_insn_size,
 137                                            CORE_ADDR *adjusted_insn_addr,
 138                                            CORE_ADDR *adjusted_insn_addr_end);
 139
 140   /* Return the bytecode operations vector for the current inferior.
 141      Returns NULL if bytecode compilation is not supported.  */
 142   struct emit_ops *(*emit_ops) (void);
 143 };
 144
 145 extern struct linux_target_ops the_low_target;
 146
 147 #define ptid_of(proc) ((proc)->head.id)
 148 #define pid_of(proc) ptid_get_pid ((proc)->head.id)
 149 #define lwpid_of(proc) ptid_get_lwp ((proc)->head.id)
 150
 151 #define get_lwp(inf) ((struct lwp_info *)(inf))
 152 #define get_thread_lwp(thr) (get_lwp (inferior_target_data (thr)))
 153 #define get_lwp_thread(proc) ((struct thread_info *)                    \
 154                               find_inferior_id (&all_threads,           \
 155                                                 get_lwp (proc)->head.id))
 156
 157 struct lwp_info
 158 {
 159   struct inferior_list_entry head;
 160
 161   /* If this flag is set, the next SIGSTOP will be ignored (the
 162      process will be immediately resumed).  This means that either we
 163      sent the SIGSTOP to it ourselves and got some other pending event
 164      (so the SIGSTOP is still pending), or that we stopped the
 165      inferior implicitly via PTRACE_ATTACH and have not waited for it
 166      yet.  */
 167   int stop_expected;
 168
 169   /* When this is true, we shall not try to resume this thread, even
 170      if last_resume_kind isn't resume_stop.  */
 171   int suspended;
 172
 173   /* If this flag is set, the lwp is known to be stopped right now (stop
 174      event already received in a wait()).  */
 175   int stopped;
 176
 177   /* If this flag is set, the lwp is known to be dead already (exit
 178      event already received in a wait(), and is cached in
 179      status_pending).  */
 180   int dead;
 181
 182   /* When stopped is set, the last wait status recorded for this lwp.  */
 183   int last_status;
 184
 185   /* When stopped is set, this is where the lwp stopped, with
 186      decr_pc_after_break already accounted for.  */
 187   CORE_ADDR stop_pc;
 188
 189   /* If this flag is set, STATUS_PENDING is a waitstatus that has not yet
 190      been reported.  */
 191   int status_pending_p;
 192   int status_pending;
 193
 194   /* STOPPED_BY_WATCHPOINT is non-zero if this LWP stopped with a data
 195      watchpoint trap.  */
 196   int stopped_by_watchpoint;
 197
 198   /* On architectures where it is possible to know the data address of
 199      a triggered watchpoint, STOPPED_DATA_ADDRESS is non-zero, and
 200      contains such data address.  Only valid if STOPPED_BY_WATCHPOINT
 201      is true.  */
 202   CORE_ADDR stopped_data_address;
 203
 204   /* If this is non-zero, it is a breakpoint to be reinserted at our next
 205      stop (SIGTRAP stops only).  */
 206   CORE_ADDR bp_reinsert;
 207
 208   /* If this flag is set, the last continue operation at the ptrace
 209      level on this process was a single-step.  */
 210   int stepping;
 211
 212   /* If this flag is set, we need to set the event request flags the
 213      next time we see this LWP stop.  */
 214   int must_set_ptrace_flags;
 215
 216   /* If this is non-zero, it points to a chain of signals which need to
 217      be delivered to this process.  */
 218   struct pending_signals *pending_signals;
 219
 220   /* A link used when resuming.  It is initialized from the resume request,
 221      and then processed and cleared in linux_resume_one_lwp.  */
 222   struct thread_resume *resume;
 223
 224   /* True if it is known that this lwp is presently collecting a fast
 225      tracepoint (it is in the jump pad or in some code that will
 226      return to the jump pad.  Normally, we won't care about this, but
 227      we will if a signal arrives to this lwp while it is
 228      collecting.  */
 229   int collecting_fast_tracepoint;
 230
 231   /* If this is non-zero, it points to a chain of signals which need
 232      to be reported to GDB.  These were deferred because the thread
 233      was doing a fast tracepoint collect when they arrived.  */
 234   struct pending_signals *pending_signals_to_report;
 235
 236   /* When collecting_fast_tracepoint is first found to be 1, we insert
 237      a exit-jump-pad-quickly breakpoint.  This is it.  */
 238   struct breakpoint *exit_jump_pad_bkpt;
 239
 240   /* True if the LWP was seen stop at an internal breakpoint and needs
 241      stepping over later when it is resumed.  */
 242   int need_step_over;
 243
 244   int thread_known;
 245 #ifdef HAVE_THREAD_DB_H
 246   /* The thread handle, used for e.g. TLS access.  Only valid if
 247      THREAD_KNOWN is set.  */
 248   td_thrhandle_t th;
 249 #endif
 250
 251   /* Arch-specific additions.  */
 252   struct arch_lwp_info *arch_private;
 253 };
 254
 255 extern struct inferior_list all_lwps;
 256
 257 char *linux_child_pid_to_exec_file (int pid);
 258 int elf_64_file_p (const char *file);
 259
 260 void linux_attach_lwp (unsigned long pid);
 261 struct lwp_info *find_lwp_pid (ptid_t ptid);
 262
 263 /* From thread-db.c  */
 264 int thread_db_init (int use_events);
 265 void thread_db_detach (struct process_info *);
 266 void thread_db_mourn (struct process_info *);
 267 int thread_db_handle_monitor_command (char *);
 268 int thread_db_get_tls_address (struct thread_info *thread, CORE_ADDR offset,
 269                                CORE_ADDR load_module, CORE_ADDR *address);
 270 int thread_db_look_up_one_symbol (const char *name, CORE_ADDR *addrp);