gdb/gdbserver/linux-low.h

   1 /* Internal interfaces for the GNU/Linux specific target code for gdbserver.
   2    Copyright (C) 2002, 2004, 2005, 2007 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #ifdef HAVE_THREAD_DB_H
  20 #include <thread_db.h>
  21 #endif
  22
  23 #ifdef HAVE_LINUX_REGSETS
  24 typedef void (*regset_fill_func) (void *);
  25 typedef void (*regset_store_func) (const void *);
  26 enum regset_type {
  27   GENERAL_REGS,
  28   FP_REGS,
  29   EXTENDED_REGS,
  30 };
  31
  32 struct regset_info
  33 {
  34   int get_request, set_request;
  35   int size;
  36   enum regset_type type;
  37   regset_fill_func fill_function;
  38   regset_store_func store_function;
  39 };
  40 extern struct regset_info target_regsets[];
  41 #endif
  42
  43 struct linux_target_ops
  44 {
  45   int num_regs;
  46   int *regmap;
  47   int (*cannot_fetch_register) (int);
  48
  49   /* Returns 0 if we can store the register, 1 if we can not
  50      store the register, and 2 if failure to store the register
  51      is acceptable.  */
  52   int (*cannot_store_register) (int);
  53   CORE_ADDR (*get_pc) (void);
  54   void (*set_pc) (CORE_ADDR newpc);
  55   const unsigned char *breakpoint;
  56   int breakpoint_len;
  57   CORE_ADDR (*breakpoint_reinsert_addr) (void);
  58
  59
  60   int decr_pc_after_break;
  61   int (*breakpoint_at) (CORE_ADDR pc);
  62
  63   /* Watchpoint related functions.  See target.h for comments.  */
  64   int (*insert_watchpoint) (char type, CORE_ADDR addr, int len);
  65   int (*remove_watchpoint) (char type, CORE_ADDR addr, int len);
  66   int (*stopped_by_watchpoint) (void);
  67   CORE_ADDR (*stopped_data_address) (void);
  68
  69   /* Whether to left-pad registers for PEEKUSR/POKEUSR if they are smaller
  70      than an xfer unit.  */
  71   int left_pad_xfer;
  72
  73   /* What string to report to GDB when it asks for the architecture,
  74      or NULL not to answer.  */
  75   const char *arch_string;
  76 };
  77
  78 extern struct linux_target_ops the_low_target;
  79
  80 #define get_process(inf) ((struct process_info *)(inf))
  81 #define get_thread_process(thr) (get_process (inferior_target_data (thr)))
  82 #define get_process_thread(proc) ((struct thread_info *) \
  83                                   find_inferior_id (&all_threads, \
  84                                   get_process (proc)->lwpid))
  85
  86 struct process_info
  87 {
  88   struct inferior_list_entry head;
  89   unsigned long lwpid;
  90
  91   /* If this flag is set, the next SIGSTOP will be ignored (the
  92      process will be immediately resumed).  This means that either we
  93      sent the SIGSTOP to it ourselves and got some other pending event
  94      (so the SIGSTOP is still pending), or that we stopped the
  95      inferior implicitly via PTRACE_ATTACH and have not waited for it
  96      yet.  */
  97   int stop_expected;
  98
  99   /* If this flag is set, the process is known to be stopped right now (stop
 100      event already received in a wait()).  */
 101   int stopped;
 102
 103   /* When stopped is set, the last wait status recorded for this process.  */
 104   int last_status;
 105
 106   /* If this flag is set, STATUS_PENDING is a waitstatus that has not yet
 107      been reported.  */
 108   int status_pending_p;
 109   int status_pending;
 110
 111   /* If this flag is set, the pending status is a (GDB-placed) breakpoint.  */
 112   int pending_is_breakpoint;
 113   CORE_ADDR pending_stop_pc;
 114
 115   /* If this is non-zero, it is a breakpoint to be reinserted at our next
 116      stop (SIGTRAP stops only).  */
 117   CORE_ADDR bp_reinsert;
 118
 119   /* If this flag is set, the last continue operation on this process
 120      was a single-step.  */
 121   int stepping;
 122
 123   /* If this is non-zero, it points to a chain of signals which need to
 124      be delivered to this process.  */
 125   struct pending_signals *pending_signals;
 126
 127   /* A link used when resuming.  It is initialized from the resume request,
 128      and then processed and cleared in linux_resume_one_process.  */
 129
 130   struct thread_resume *resume;
 131
 132   int thread_known;
 133   unsigned long tid;
 134 #ifdef HAVE_THREAD_DB_H
 135   /* The thread handle, used for e.g. TLS access.  Only valid if
 136      THREAD_KNOWN is set.  */
 137   td_thrhandle_t th;
 138 #endif
 139 };
 140
 141 extern struct inferior_list all_processes;
 142
 143 void linux_attach_lwp (unsigned long pid);
 144
 145 int thread_db_init (int use_events);
 146 int thread_db_get_tls_address (struct thread_info *thread, CORE_ADDR offset,
 147                                CORE_ADDR load_module, CORE_ADDR *address);