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
 141 extern struct linux_target_ops the_low_target;
 142
 143 #define ptid_of(proc) ((proc)->head.id)
 144 #define pid_of(proc) ptid_get_pid ((proc)->head.id)
 145 #define lwpid_of(proc) ptid_get_lwp ((proc)->head.id)
 146
 147 #define get_lwp(inf) ((struct lwp_info *)(inf))
 148 #define get_thread_lwp(thr) (get_lwp (inferior_target_data (thr)))
 149 #define get_lwp_thread(proc) ((struct thread_info *)                    \
 150                               find_inferior_id (&all_threads,           \
 151                                                 get_lwp (proc)->head.id))
 152
 153 struct lwp_info
 154 {
 155   struct inferior_list_entry head;
 156
 157   /* If this flag is set, the next SIGSTOP will be ignored (the
 158      process will be immediately resumed).  This means that either we
 159      sent the SIGSTOP to it ourselves and got some other pending event
 160      (so the SIGSTOP is still pending), or that we stopped the
 161      inferior implicitly via PTRACE_ATTACH and have not waited for it
 162      yet.  */
 163   int stop_expected;
 164
 165   /* When this is true, we shall not try to resume this thread, even
 166      if last_resume_kind isn't resume_stop.  */
 167   int suspended;
 168
 169   /* If this flag is set, the lwp is known to be stopped right now (stop
 170      event already received in a wait()).  */
 171   int stopped;
 172
 173   /* If this flag is set, the lwp is known to be dead already (exit
 174      event already received in a wait(), and is cached in
 175      status_pending).  */
 176   int dead;
 177
 178   /* When stopped is set, the last wait status recorded for this lwp.  */
 179   int last_status;
 180
 181   /* When stopped is set, this is where the lwp stopped, with
 182      decr_pc_after_break already accounted for.  */
 183   CORE_ADDR stop_pc;
 184
 185   /* If this flag is set, STATUS_PENDING is a waitstatus that has not yet
 186      been reported.  */
 187   int status_pending_p;
 188   int status_pending;
 189
 190   /* STOPPED_BY_WATCHPOINT is non-zero if this LWP stopped with a data
 191      watchpoint trap.  */
 192   int stopped_by_watchpoint;
 193
 194   /* On architectures where it is possible to know the data address of
 195      a triggered watchpoint, STOPPED_DATA_ADDRESS is non-zero, and
 196      contains such data address.  Only valid if STOPPED_BY_WATCHPOINT
 197      is true.  */
 198   CORE_ADDR stopped_data_address;
 199
 200   /* If this is non-zero, it is a breakpoint to be reinserted at our next
 201      stop (SIGTRAP stops only).  */
 202   CORE_ADDR bp_reinsert;
 203
 204   /* If this flag is set, the last continue operation at the ptrace
 205      level on this process was a single-step.  */
 206   int stepping;
 207
 208   /* If this flag is set, we need to set the event request flags the
 209      next time we see this LWP stop.  */
 210   int must_set_ptrace_flags;
 211
 212   /* If this is non-zero, it points to a chain of signals which need to
 213      be delivered to this process.  */
 214   struct pending_signals *pending_signals;
 215
 216   /* A link used when resuming.  It is initialized from the resume request,
 217      and then processed and cleared in linux_resume_one_lwp.  */
 218   struct thread_resume *resume;
 219
 220   /* True if it is known that this lwp is presently collecting a fast
 221      tracepoint (it is in the jump pad or in some code that will
 222      return to the jump pad.  Normally, we won't care about this, but
 223      we will if a signal arrives to this lwp while it is
 224      collecting.  */
 225   int collecting_fast_tracepoint;
 226
 227   /* If this is non-zero, it points to a chain of signals which need
 228      to be reported to GDB.  These were deferred because the thread
 229      was doing a fast tracepoint collect when they arrived.  */
 230   struct pending_signals *pending_signals_to_report;
 231
 232   /* When collecting_fast_tracepoint is first found to be 1, we insert
 233      a exit-jump-pad-quickly breakpoint.  This is it.  */
 234   struct breakpoint *exit_jump_pad_bkpt;
 235
 236   /* True if the LWP was seen stop at an internal breakpoint and needs
 237      stepping over later when it is resumed.  */
 238   int need_step_over;
 239
 240   int thread_known;
 241 #ifdef HAVE_THREAD_DB_H
 242   /* The thread handle, used for e.g. TLS access.  Only valid if
 243      THREAD_KNOWN is set.  */
 244   td_thrhandle_t th;
 245 #endif
 246
 247   /* Arch-specific additions.  */
 248   struct arch_lwp_info *arch_private;
 249 };
 250
 251 extern struct inferior_list all_lwps;
 252
 253 char *linux_child_pid_to_exec_file (int pid);
 254 int elf_64_file_p (const char *file);
 255
 256 void linux_attach_lwp (unsigned long pid);
 257 struct lwp_info *find_lwp_pid (ptid_t ptid);
 258 int linux_get_thread_area (int lwpid, CORE_ADDR *area);
 259
 260 /* From thread-db.c  */
 261 int thread_db_init (int use_events);
 262 void thread_db_detach (struct process_info *);
 263 void thread_db_mourn (struct process_info *);
 264 int thread_db_handle_monitor_command (char *);
 265 int thread_db_get_tls_address (struct thread_info *thread, CORE_ADDR offset,
 266                                CORE_ADDR load_module, CORE_ADDR *address);
 267 int thread_db_look_up_one_symbol (const char *name, CORE_ADDR *addrp);