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