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 #ifdef HAVE_LINUX_REGSETS
  25 typedef void (*regset_fill_func) (void *);
  26 typedef void (*regset_store_func) (const void *);
  27 enum regset_type {
  28   GENERAL_REGS,
  29   FP_REGS,
  30   EXTENDED_REGS,
  31 };
  32
  33 struct regset_info
  34 {
  35   int get_request, set_request;
  36   int size;
  37   enum regset_type type;
  38   regset_fill_func fill_function;
  39   regset_store_func store_function;
  40 };
  41 extern struct regset_info target_regsets[];
  42 #endif
  43
  44 struct linux_target_ops
  45 {
  46   /* Architecture-specific setup.  */
  47   void (*arch_setup) (void);
  48
  49   int num_regs;
  50   int *regmap;
  51   int (*cannot_fetch_register) (int);
  52
  53   /* Returns 0 if we can store the register, 1 if we can not
  54      store the register, and 2 if failure to store the register
  55      is acceptable.  */
  56   int (*cannot_store_register) (int);
  57   CORE_ADDR (*get_pc) (void);
  58   void (*set_pc) (CORE_ADDR newpc);
  59   const unsigned char *breakpoint;
  60   int breakpoint_len;
  61   CORE_ADDR (*breakpoint_reinsert_addr) (void);
  62
  63
  64   int decr_pc_after_break;
  65   int (*breakpoint_at) (CORE_ADDR pc);
  66
  67   /* Watchpoint related functions.  See target.h for comments.  */
  68   int (*insert_watchpoint) (char type, CORE_ADDR addr, int len);
  69   int (*remove_watchpoint) (char type, CORE_ADDR addr, int len);
  70   int (*stopped_by_watchpoint) (void);
  71   CORE_ADDR (*stopped_data_address) (void);
  72
  73   /* Hooks to reformat register data for PEEKUSR/POKEUSR (in particular
  74      for registers smaller than an xfer unit).  */
  75   void (*collect_ptrace_register) (int regno, char *buf);
  76   void (*supply_ptrace_register) (int regno, const char *buf);
  77 };
  78
  79 extern struct linux_target_ops the_low_target;
  80
  81 #define pid_of(proc) ((proc)->head.id)
  82 #define lwpid_of(proc) ((proc)->head.id)
  83
  84 #define get_lwp(inf) ((struct lwp_info *)(inf))
  85 #define get_thread_lwp(thr) (get_lwp (inferior_target_data (thr)))
  86 #define get_lwp_thread(proc) ((struct thread_info *)                    \
  87                               find_inferior_id (&all_threads,           \
  88                                                 lwpid_of (get_lwp (proc))))
  89
  90 struct lwp_info
  91 {
  92   struct inferior_list_entry head;
  93
  94   /* If this flag is set, the next SIGSTOP will be ignored (the
  95      process will be immediately resumed).  This means that either we
  96      sent the SIGSTOP to it ourselves and got some other pending event
  97      (so the SIGSTOP is still pending), or that we stopped the
  98      inferior implicitly via PTRACE_ATTACH and have not waited for it
  99      yet.  */
 100   int stop_expected;
 101
 102   /* True if this thread was suspended (with vCont;t).  */
 103   int suspended;
 104
 105   /* If this flag is set, the lwp is known to be stopped right now (stop
 106      event already received in a wait()).  */
 107   int stopped;
 108
 109   /* When stopped is set, the last wait status recorded for this lwp.  */
 110   int last_status;
 111
 112   /* If this flag is set, STATUS_PENDING is a waitstatus that has not yet
 113      been reported.  */
 114   int status_pending_p;
 115   int status_pending;
 116
 117   /* If this flag is set, the pending status is a (GDB-placed) breakpoint.  */
 118   int pending_is_breakpoint;
 119   CORE_ADDR pending_stop_pc;
 120
 121   /* If this is non-zero, it is a breakpoint to be reinserted at our next
 122      stop (SIGTRAP stops only).  */
 123   CORE_ADDR bp_reinsert;
 124
 125   /* If this flag is set, the last continue operation on this process
 126      was a single-step.  */
 127   int stepping;
 128
 129   /* If this is non-zero, it points to a chain of signals which need to
 130      be delivered to this process.  */
 131   struct pending_signals *pending_signals;
 132
 133   /* A link used when resuming.  It is initialized from the resume request,
 134      and then processed and cleared in linux_resume_one_lwp.  */
 135
 136   struct thread_resume *resume;
 137
 138   int thread_known;
 139 #ifdef HAVE_THREAD_DB_H
 140   /* The thread handle, used for e.g. TLS access.  Only valid if
 141      THREAD_KNOWN is set.  */
 142   td_thrhandle_t th;
 143 #endif
 144 };
 145
 146 extern struct inferior_list all_lwps;
 147
 148 void linux_attach_lwp (unsigned long pid);
 149
 150 int thread_db_init (int use_events);
 151 int thread_db_get_tls_address (struct thread_info *thread, CORE_ADDR offset,
 152                                CORE_ADDR load_module, CORE_ADDR *address);