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
   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) (void *);
  28 typedef void (*regset_store_func) (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   int size;
  39   enum regset_type type;
  40   regset_fill_func fill_function;
  41   regset_store_func store_function;
  42 };
  43 extern struct regset_info target_regsets[];
  44 #endif
  45
  46 struct siginfo;
  47
  48 struct process_info_private
  49 {
  50   /* True if this process has loaded thread_db, and it is active.  */
  51   int thread_db_active;
  52
  53   /* Structure that identifies the child process for the
  54      <proc_service.h> interface.  */
  55   struct ps_prochandle proc_handle;
  56
  57   /* Connection to the libthread_db library.  */
  58   td_thragent_t *thread_agent;
  59
  60   /* Arch-specific additions.  */
  61   struct arch_process_info *arch_private;
  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) (void);
  80   void (*set_pc) (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) (int regno, char *buf);
  98   void (*supply_ptrace_register) (int regno, const char *buf);
  99
 100   /* Hook to convert from target format to ptrace format and back.
 101      Returns true if any conversion was done; false otherwise.
 102      If DIRECTION is 1, then copy from INF to NATIVE.
 103      If DIRECTION is 0, copy from NATIVE to INF.  */
 104   int (*siginfo_fixup) (struct siginfo *native, void *inf, int direction);
 105
 106   /* Hook to call when a new process is created or attached to.
 107      If extra per-process architecture-specific data is needed,
 108      allocate it here.  */
 109   struct arch_process_info * (*new_process) (void);
 110
 111   /* Hook to call when a new thread is detected.
 112      If extra per-thread architecture-specific data is needed,
 113      allocate it here.  */
 114   struct arch_lwp_info * (*new_thread) (void);
 115
 116   /* Hook to call prior to resuming a thread.  */
 117   void (*prepare_to_resume) (struct lwp_info *);
 118 };
 119
 120 extern struct linux_target_ops the_low_target;
 121
 122 #define ptid_of(proc) ((proc)->head.id)
 123 #define pid_of(proc) ptid_get_pid ((proc)->head.id)
 124 #define lwpid_of(proc) ptid_get_lwp ((proc)->head.id)
 125
 126 #define get_lwp(inf) ((struct lwp_info *)(inf))
 127 #define get_thread_lwp(thr) (get_lwp (inferior_target_data (thr)))
 128 #define get_lwp_thread(proc) ((struct thread_info *)                    \
 129                               find_inferior_id (&all_threads,           \
 130                                                 get_lwp (proc)->head.id))
 131
 132 struct lwp_info
 133 {
 134   struct inferior_list_entry head;
 135
 136   /* If this flag is set, the next SIGSTOP will be ignored (the
 137      process will be immediately resumed).  This means that either we
 138      sent the SIGSTOP to it ourselves and got some other pending event
 139      (so the SIGSTOP is still pending), or that we stopped the
 140      inferior implicitly via PTRACE_ATTACH and have not waited for it
 141      yet.  */
 142   int stop_expected;
 143
 144   /* True if this thread was suspended (with vCont;t).  */
 145   int suspended;
 146
 147   /* If this flag is set, the lwp is known to be stopped right now (stop
 148      event already received in a wait()).  */
 149   int stopped;
 150
 151   /* If this flag is set, the lwp is known to be dead already (exit
 152      event already received in a wait(), and is cached in
 153      status_pending).  */
 154   int dead;
 155
 156   /* When stopped is set, the last wait status recorded for this lwp.  */
 157   int last_status;
 158
 159   /* If this flag is set, STATUS_PENDING is a waitstatus that has not yet
 160      been reported.  */
 161   int status_pending_p;
 162   int status_pending;
 163
 164   /* If this flag is set, the pending status is a (GDB-placed) breakpoint.  */
 165   int pending_is_breakpoint;
 166   CORE_ADDR pending_stop_pc;
 167
 168   /* If this is non-zero, it is a breakpoint to be reinserted at our next
 169      stop (SIGTRAP stops only).  */
 170   CORE_ADDR bp_reinsert;
 171
 172   /* If this flag is set, the last continue operation on this process
 173      was a single-step.  */
 174   int stepping;
 175
 176   /* If this flag is set, we need to set the event request flags the
 177      next time we see this LWP stop.  */
 178   int must_set_ptrace_flags;
 179
 180   /* If this is non-zero, it points to a chain of signals which need to
 181      be delivered to this process.  */
 182   struct pending_signals *pending_signals;
 183
 184   /* A link used when resuming.  It is initialized from the resume request,
 185      and then processed and cleared in linux_resume_one_lwp.  */
 186
 187   struct thread_resume *resume;
 188
 189   int thread_known;
 190 #ifdef HAVE_THREAD_DB_H
 191   /* The thread handle, used for e.g. TLS access.  Only valid if
 192      THREAD_KNOWN is set.  */
 193   td_thrhandle_t th;
 194 #endif
 195
 196   /* Arch-specific additions.  */
 197   struct arch_lwp_info *arch_private;
 198 };
 199
 200 extern struct inferior_list all_lwps;
 201
 202 char *linux_child_pid_to_exec_file (int pid);
 203 int elf_64_file_p (const char *file);
 204
 205 void linux_attach_lwp (unsigned long pid);
 206
 207 int thread_db_init (int use_events);
 208 int thread_db_get_tls_address (struct thread_info *thread, CORE_ADDR offset,
 209                                CORE_ADDR load_module, CORE_ADDR *address);
 210
 211 struct lwp_info *find_lwp_pid (ptid_t ptid);