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)->tid))
  85
  86 struct process_info
  87 {
  88   struct inferior_list_entry head;
  89   int thread_known;
  90   unsigned long lwpid;
  91   unsigned long tid;
  92
  93   /* If this flag is set, the next SIGSTOP will be ignored (the
  94      process will be immediately resumed).  This means that either we
  95      sent the SIGSTOP to it ourselves and got some other pending event
  96      (so the SIGSTOP is still pending), or that we stopped the
  97      inferior implicitly via PTRACE_ATTACH and have not waited for it
  98      yet.  */
  99   int stop_expected;
 100
 101   /* If this flag is set, the process is known to be stopped right now (stop
 102      event already received in a wait()).  */
 103   int stopped;
 104
 105   /* When stopped is set, the last wait status recorded for this process.  */
 106   int last_status;
 107
 108   /* If this flag is set, we have sent a SIGSTOP to this process and are
 109      waiting for it to stop.  */
 110   int sigstop_sent;
 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_process.  */
 135
 136   struct thread_resume *resume;
 137
 138 #ifdef HAVE_THREAD_DB_H
 139   /* The thread handle, used for e.g. TLS access.  */
 140   td_thrhandle_t th;
 141 #endif
 142 };
 143
 144 extern struct inferior_list all_processes;
 145
 146 void linux_attach_lwp (unsigned long pid, unsigned long tid);
 147
 148 int thread_db_init (void);
 149 int thread_db_get_tls_address (struct thread_info *thread, CORE_ADDR offset,
 150                                CORE_ADDR load_module, CORE_ADDR *address);