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 process_info_private
  47 {
  48   /* True if this process has loaded thread_db, and it is active.  */
  49   int thread_db_active;
  50
  51   /* Structure that identifies the child process for the
  52      <proc_service.h> interface.  */
  53   struct ps_prochandle proc_handle;
  54
  55   /* Connection to the libthread_db library.  */
  56   td_thragent_t *thread_agent;
  57 };
  58
  59 struct linux_target_ops
  60 {
  61   /* Architecture-specific setup.  */
  62   void (*arch_setup) (void);
  63
  64   int num_regs;
  65   int *regmap;
  66   int (*cannot_fetch_register) (int);
  67
  68   /* Returns 0 if we can store the register, 1 if we can not
  69      store the register, and 2 if failure to store the register
  70      is acceptable.  */
  71   int (*cannot_store_register) (int);
  72   CORE_ADDR (*get_pc) (void);
  73   void (*set_pc) (CORE_ADDR newpc);
  74   const unsigned char *breakpoint;
  75   int breakpoint_len;
  76   CORE_ADDR (*breakpoint_reinsert_addr) (void);
  77
  78
  79   int decr_pc_after_break;
  80   int (*breakpoint_at) (CORE_ADDR pc);
  81
  82   /* Watchpoint related functions.  See target.h for comments.  */
  83   int (*insert_watchpoint) (char type, CORE_ADDR addr, int len);
  84   int (*remove_watchpoint) (char type, CORE_ADDR addr, int len);
  85   int (*stopped_by_watchpoint) (void);
  86   CORE_ADDR (*stopped_data_address) (void);
  87
  88   /* Hooks to reformat register data for PEEKUSR/POKEUSR (in particular
  89      for registers smaller than an xfer unit).  */
  90   void (*collect_ptrace_register) (int regno, char *buf);
  91   void (*supply_ptrace_register) (int regno, const char *buf);
  92 };
  93
  94 extern struct linux_target_ops the_low_target;
  95
  96 #define pid_of(proc) ptid_get_pid ((proc)->head.id)
  97 #define lwpid_of(proc) ptid_get_lwp ((proc)->head.id)
  98
  99 #define get_lwp(inf) ((struct lwp_info *)(inf))
 100 #define get_thread_lwp(thr) (get_lwp (inferior_target_data (thr)))
 101 #define get_lwp_thread(proc) ((struct thread_info *)                    \
 102                               find_inferior_id (&all_threads,           \
 103                                                 get_lwp (proc)->head.id))
 104
 105 struct lwp_info
 106 {
 107   struct inferior_list_entry head;
 108
 109   /* If this flag is set, the next SIGSTOP will be ignored (the
 110      process will be immediately resumed).  This means that either we
 111      sent the SIGSTOP to it ourselves and got some other pending event
 112      (so the SIGSTOP is still pending), or that we stopped the
 113      inferior implicitly via PTRACE_ATTACH and have not waited for it
 114      yet.  */
 115   int stop_expected;
 116
 117   /* True if this thread was suspended (with vCont;t).  */
 118   int suspended;
 119
 120   /* If this flag is set, the lwp is known to be stopped right now (stop
 121      event already received in a wait()).  */
 122   int stopped;
 123
 124   /* If this flag is set, the lwp is known to be dead already (exit
 125      event already received in a wait(), and is cached in
 126      status_pending).  */
 127   int dead;
 128
 129   /* When stopped is set, the last wait status recorded for this lwp.  */
 130   int last_status;
 131
 132   /* If this flag is set, STATUS_PENDING is a waitstatus that has not yet
 133      been reported.  */
 134   int status_pending_p;
 135   int status_pending;
 136
 137   /* If this flag is set, the pending status is a (GDB-placed) breakpoint.  */
 138   int pending_is_breakpoint;
 139   CORE_ADDR pending_stop_pc;
 140
 141   /* If this is non-zero, it is a breakpoint to be reinserted at our next
 142      stop (SIGTRAP stops only).  */
 143   CORE_ADDR bp_reinsert;
 144
 145   /* If this flag is set, the last continue operation on this process
 146      was a single-step.  */
 147   int stepping;
 148
 149   /* If this flag is set, we need to set the event request flags the
 150      next time we see this LWP stop.  */
 151   int must_set_ptrace_flags;
 152
 153   /* If this is non-zero, it points to a chain of signals which need to
 154      be delivered to this process.  */
 155   struct pending_signals *pending_signals;
 156
 157   /* A link used when resuming.  It is initialized from the resume request,
 158      and then processed and cleared in linux_resume_one_lwp.  */
 159
 160   struct thread_resume *resume;
 161
 162   int thread_known;
 163 #ifdef HAVE_THREAD_DB_H
 164   /* The thread handle, used for e.g. TLS access.  Only valid if
 165      THREAD_KNOWN is set.  */
 166   td_thrhandle_t th;
 167 #endif
 168 };
 169
 170 extern struct inferior_list all_lwps;
 171
 172 void linux_attach_lwp (unsigned long pid);
 173
 174 int thread_db_init (int use_events);
 175 int thread_db_get_tls_address (struct thread_info *thread, CORE_ADDR offset,
 176                                CORE_ADDR load_module, CORE_ADDR *address);
 177
 178 struct lwp_info *find_lwp_pid (ptid_t ptid);