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
 125 extern struct linux_target_ops the_low_target;
 126
 127 #define ptid_of(proc) ((proc)->head.id)
 128 #define pid_of(proc) ptid_get_pid ((proc)->head.id)
 129 #define lwpid_of(proc) ptid_get_lwp ((proc)->head.id)
 130
 131 #define get_lwp(inf) ((struct lwp_info *)(inf))
 132 #define get_thread_lwp(thr) (get_lwp (inferior_target_data (thr)))
 133 #define get_lwp_thread(proc) ((struct thread_info *)                    \
 134                               find_inferior_id (&all_threads,           \
 135                                                 get_lwp (proc)->head.id))
 136
 137 struct lwp_info
 138 {
 139   struct inferior_list_entry head;
 140
 141   /* If this flag is set, the next SIGSTOP will be ignored (the
 142      process will be immediately resumed).  This means that either we
 143      sent the SIGSTOP to it ourselves and got some other pending event
 144      (so the SIGSTOP is still pending), or that we stopped the
 145      inferior implicitly via PTRACE_ATTACH and have not waited for it
 146      yet.  */
 147   int stop_expected;
 148
 149   /* When this is true, we shall not try to resume this thread, even
 150      if last_resume_kind isn't resume_stop.  */
 151   int suspended;
 152
 153   /* If this flag is set, the lwp is known to be stopped right now (stop
 154      event already received in a wait()).  */
 155   int stopped;
 156
 157   /* If this flag is set, the lwp is known to be dead already (exit
 158      event already received in a wait(), and is cached in
 159      status_pending).  */
 160   int dead;
 161
 162   /* When stopped is set, the last wait status recorded for this lwp.  */
 163   int last_status;
 164
 165   /* When stopped is set, this is where the lwp stopped, with
 166      decr_pc_after_break already accounted for.  */
 167   CORE_ADDR stop_pc;
 168
 169   /* If this flag is set, STATUS_PENDING is a waitstatus that has not yet
 170      been reported.  */
 171   int status_pending_p;
 172   int status_pending;
 173
 174   /* STOPPED_BY_WATCHPOINT is non-zero if this LWP stopped with a data
 175      watchpoint trap.  */
 176   int stopped_by_watchpoint;
 177
 178   /* On architectures where it is possible to know the data address of
 179      a triggered watchpoint, STOPPED_DATA_ADDRESS is non-zero, and
 180      contains such data address.  Only valid if STOPPED_BY_WATCHPOINT
 181      is true.  */
 182   CORE_ADDR stopped_data_address;
 183
 184   /* If this is non-zero, it is a breakpoint to be reinserted at our next
 185      stop (SIGTRAP stops only).  */
 186   CORE_ADDR bp_reinsert;
 187
 188   /* If this flag is set, the last continue operation at the ptrace
 189      level on this process was a single-step.  */
 190   int stepping;
 191
 192   /* If this flag is set, we need to set the event request flags the
 193      next time we see this LWP stop.  */
 194   int must_set_ptrace_flags;
 195
 196   /* If this is non-zero, it points to a chain of signals which need to
 197      be delivered to this process.  */
 198   struct pending_signals *pending_signals;
 199
 200   /* A link used when resuming.  It is initialized from the resume request,
 201      and then processed and cleared in linux_resume_one_lwp.  */
 202   struct thread_resume *resume;
 203
 204   /* The last resume GDB requested on this thread.  */
 205   enum resume_kind last_resume_kind;
 206
 207   /* True if the LWP was seen stop at an internal breakpoint and needs
 208      stepping over later when it is resumed.  */
 209   int need_step_over;
 210
 211   int thread_known;
 212 #ifdef HAVE_THREAD_DB_H
 213   /* The thread handle, used for e.g. TLS access.  Only valid if
 214      THREAD_KNOWN is set.  */
 215   td_thrhandle_t th;
 216 #endif
 217
 218   /* Arch-specific additions.  */
 219   struct arch_lwp_info *arch_private;
 220 };
 221
 222 extern struct inferior_list all_lwps;
 223
 224 char *linux_child_pid_to_exec_file (int pid);
 225 int elf_64_file_p (const char *file);
 226
 227 void linux_attach_lwp (unsigned long pid);
 228 struct lwp_info *find_lwp_pid (ptid_t ptid);
 229
 230 /* From thread-db.c  */
 231 int thread_db_init (int use_events);
 232 void thread_db_free (struct process_info *, int detaching);
 233 int thread_db_handle_monitor_command (char *);
 234 int thread_db_get_tls_address (struct thread_info *thread, CORE_ADDR offset,
 235                                CORE_ADDR load_module, CORE_ADDR *address);