gnu/dist/gdb6/gdb/gdbserver/linux-low.h

   1 /* Internal interfaces for the GNU/Linux specific target code for gdbserver.
   2    Copyright (C) 2002, 2004, 2005 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 2 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, write to the Free Software
  18    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  19    Boston, MA 02110-1301, USA.  */
  20
  21 #ifdef HAVE_LINUX_REGSETS
  22 typedef void (*regset_fill_func) (void *);
  23 typedef void (*regset_store_func) (const void *);
  24 enum regset_type {
  25   GENERAL_REGS,
  26   FP_REGS,
  27   EXTENDED_REGS,
  28 };
  29
  30 struct regset_info
  31 {
  32   int get_request, set_request;
  33   int size;
  34   enum regset_type type;
  35   regset_fill_func fill_function;
  36   regset_store_func store_function;
  37 };
  38 extern struct regset_info target_regsets[];
  39 #endif
  40
  41 struct linux_target_ops
  42 {
  43   int num_regs;
  44   int *regmap;
  45   int (*cannot_fetch_register) (int);
  46
  47   /* Returns 0 if we can store the register, 1 if we can not
  48      store the register, and 2 if failure to store the register
  49      is acceptable.  */
  50   int (*cannot_store_register) (int);
  51   CORE_ADDR (*get_pc) (void);
  52   void (*set_pc) (CORE_ADDR newpc);
  53   const unsigned char *breakpoint;
  54   int breakpoint_len;
  55   CORE_ADDR (*breakpoint_reinsert_addr) (void);
  56
  57
  58   int decr_pc_after_break;
  59   int (*breakpoint_at) (CORE_ADDR pc);
  60
  61   /* Watchpoint related functions.  See target.h for comments.  */
  62   int (*insert_watchpoint) (char type, CORE_ADDR addr, int len);
  63   int (*remove_watchpoint) (char type, CORE_ADDR addr, int len);
  64   int (*stopped_by_watchpoint) (void);
  65   CORE_ADDR (*stopped_data_address) (void);
  66
  67   /* Whether to left-pad registers for PEEKUSR/POKEUSR if they are smaller
  68      than an xfer unit.  */
  69   int left_pad_xfer;
  70 };
  71
  72 extern struct linux_target_ops the_low_target;
  73
  74 #define get_process(inf) ((struct process_info *)(inf))
  75 #define get_thread_process(thr) (get_process (inferior_target_data (thr)))
  76 #define get_process_thread(proc) ((struct thread_info *) \
  77                                   find_inferior_id (&all_threads, \
  78                                   get_process (proc)->tid))
  79
  80 struct process_info
  81 {
  82   struct inferior_list_entry head;
  83   int thread_known;
  84   unsigned long lwpid;
  85   unsigned long tid;
  86
  87   /* If this flag is set, the next SIGSTOP will be ignored (the process will
  88      be immediately resumed).  */
  89   int stop_expected;
  90
  91   /* If this flag is set, the process is known to be stopped right now (stop
  92      event already received in a wait()).  */
  93   int stopped;
  94
  95   /* If this flag is set, we have sent a SIGSTOP to this process and are
  96      waiting for it to stop.  */
  97   int sigstop_sent;
  98
  99   /* If this flag is set, STATUS_PENDING is a waitstatus that has not yet
 100      been reported.  */
 101   int status_pending_p;
 102   int status_pending;
 103
 104   /* If this flag is set, the pending status is a (GDB-placed) breakpoint.  */
 105   int pending_is_breakpoint;
 106   CORE_ADDR pending_stop_pc;
 107
 108   /* If this is non-zero, it is a breakpoint to be reinserted at our next
 109      stop (SIGTRAP stops only).  */
 110   CORE_ADDR bp_reinsert;
 111
 112   /* If this flag is set, the last continue operation on this process
 113      was a single-step.  */
 114   int stepping;
 115
 116   /* If this is non-zero, it points to a chain of signals which need to
 117      be delivered to this process.  */
 118   struct pending_signals *pending_signals;
 119
 120   /* A link used when resuming.  It is initialized from the resume request,
 121      and then processed and cleared in linux_resume_one_process.  */
 122
 123   struct thread_resume *resume;
 124 };
 125
 126 extern struct inferior_list all_processes;
 127
 128 void linux_attach_lwp (unsigned long pid, unsigned long tid);
 129
 130 int thread_db_init (void);