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
  61 struct linux_target_ops
  62 {
  63   /* Architecture-specific setup.  */
  64   void (*arch_setup) (void);
  65
  66   int num_regs;
  67   int *regmap;
  68   int (*cannot_fetch_register) (int);
  69
  70   /* Returns 0 if we can store the register, 1 if we can not
  71      store the register, and 2 if failure to store the register
  72      is acceptable.  */
  73   int (*cannot_store_register) (int);
  74   CORE_ADDR (*get_pc) (void);
  75   void (*set_pc) (CORE_ADDR newpc);
  76   const unsigned char *breakpoint;
  77   int breakpoint_len;
  78   CORE_ADDR (*breakpoint_reinsert_addr) (void);
  79
  80   int decr_pc_after_break;
  81   int (*breakpoint_at) (CORE_ADDR pc);
  82
  83   /* Breakpoint and watchpoint related functions.  See target.h for
  84      comments.  */
  85   int (*insert_point) (char type, CORE_ADDR addr, int len);
  86   int (*remove_point) (char type, CORE_ADDR addr, int len);
  87   int (*stopped_by_watchpoint) (void);
  88   CORE_ADDR (*stopped_data_address) (void);
  89
  90   /* Hooks to reformat register data for PEEKUSR/POKEUSR (in particular
  91      for registers smaller than an xfer unit).  */
  92   void (*collect_ptrace_register) (int regno, char *buf);
  93   void (*supply_ptrace_register) (int regno, const char *buf);
  94
  95   /* Hook to convert from target format to ptrace format and back.
  96      Returns true if any conversion was done; false otherwise.
  97      If DIRECTION is 1, then copy from INF to NATIVE.
  98      If DIRECTION is 0, copy from NATIVE to INF.  */
  99   int (*siginfo_fixup) (struct siginfo *native, void *inf, int direction);
 100 };
 101
 102 extern struct linux_target_ops the_low_target;
 103
 104 #define pid_of(proc) ptid_get_pid ((proc)->head.id)
 105 #define lwpid_of(proc) ptid_get_lwp ((proc)->head.id)
 106
 107 #define get_lwp(inf) ((struct lwp_info *)(inf))
 108 #define get_thread_lwp(thr) (get_lwp (inferior_target_data (thr)))
 109 #define get_lwp_thread(proc) ((struct thread_info *)                    \
 110                               find_inferior_id (&all_threads,           \
 111                                                 get_lwp (proc)->head.id))
 112
 113 struct lwp_info
 114 {
 115   struct inferior_list_entry head;
 116
 117   /* If this flag is set, the next SIGSTOP will be ignored (the
 118      process will be immediately resumed).  This means that either we
 119      sent the SIGSTOP to it ourselves and got some other pending event
 120      (so the SIGSTOP is still pending), or that we stopped the
 121      inferior implicitly via PTRACE_ATTACH and have not waited for it
 122      yet.  */
 123   int stop_expected;
 124
 125   /* True if this thread was suspended (with vCont;t).  */
 126   int suspended;
 127
 128   /* If this flag is set, the lwp is known to be stopped right now (stop
 129      event already received in a wait()).  */
 130   int stopped;
 131
 132   /* If this flag is set, the lwp is known to be dead already (exit
 133      event already received in a wait(), and is cached in
 134      status_pending).  */
 135   int dead;
 136
 137   /* When stopped is set, the last wait status recorded for this lwp.  */
 138   int last_status;
 139
 140   /* If this flag is set, STATUS_PENDING is a waitstatus that has not yet
 141      been reported.  */
 142   int status_pending_p;
 143   int status_pending;
 144
 145   /* If this flag is set, the pending status is a (GDB-placed) breakpoint.  */
 146   int pending_is_breakpoint;
 147   CORE_ADDR pending_stop_pc;
 148
 149   /* If this is non-zero, it is a breakpoint to be reinserted at our next
 150      stop (SIGTRAP stops only).  */
 151   CORE_ADDR bp_reinsert;
 152
 153   /* If this flag is set, the last continue operation on this process
 154      was a single-step.  */
 155   int stepping;
 156
 157   /* If this flag is set, we need to set the event request flags the
 158      next time we see this LWP stop.  */
 159   int must_set_ptrace_flags;
 160
 161   /* If this is non-zero, it points to a chain of signals which need to
 162      be delivered to this process.  */
 163   struct pending_signals *pending_signals;
 164
 165   /* A link used when resuming.  It is initialized from the resume request,
 166      and then processed and cleared in linux_resume_one_lwp.  */
 167
 168   struct thread_resume *resume;
 169
 170   int thread_known;
 171 #ifdef HAVE_THREAD_DB_H
 172   /* The thread handle, used for e.g. TLS access.  Only valid if
 173      THREAD_KNOWN is set.  */
 174   td_thrhandle_t th;
 175 #endif
 176 };
 177
 178 extern struct inferior_list all_lwps;
 179
 180 char *linux_child_pid_to_exec_file (int pid);
 181 int elf_64_file_p (const char *file);
 182
 183 void linux_attach_lwp (unsigned long pid);
 184
 185 int thread_db_init (int use_events);
 186 int thread_db_get_tls_address (struct thread_info *thread, CORE_ADDR offset,
 187                                CORE_ADDR load_module, CORE_ADDR *address);
 188
 189 struct lwp_info *find_lwp_pid (ptid_t ptid);