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 siginfo;
  47
  48 struct process_info_private
  49 {
  50   /* True if this process has loaded thread_db, and it is active.  */
  51   int thread_db_active;
  52
  53   /* Structure that identifies the child process for the
  54      <proc_service.h> interface.  */
  55   struct ps_prochandle proc_handle;
  56
  57   /* Connection to the libthread_db library.  */
  58   td_thragent_t *thread_agent;
  59 };
  60
  61 struct linux_target_ops
  62 {
  63   /* Architecture-specific setup.  */
  64   void (*arch_setup) (void);
  65
  66   int num_regs;
  67   int *regmap;
  68   int (*cannot_fetch_register) (int);
  69
  70   /* Returns 0 if we can store the register, 1 if we can not
  71      store the register, and 2 if failure to store the register
  72      is acceptable.  */
  73   int (*cannot_store_register) (int);
  74   CORE_ADDR (*get_pc) (void);
  75   void (*set_pc) (CORE_ADDR newpc);
  76   const unsigned char *breakpoint;
  77   int breakpoint_len;
  78   CORE_ADDR (*breakpoint_reinsert_addr) (void);
  79
  80   int decr_pc_after_break;
  81   int (*breakpoint_at) (CORE_ADDR pc);
  82
  83   /* Watchpoint related functions.  See target.h for comments.  */
  84   int (*insert_watchpoint) (char type, CORE_ADDR addr, int len);
  85   int (*remove_watchpoint) (char type, CORE_ADDR addr, int len);
  86   int (*stopped_by_watchpoint) (void);
  87   CORE_ADDR (*stopped_data_address) (void);
  88
  89   /* Hooks to reformat register data for PEEKUSR/POKEUSR (in particular
  90      for registers smaller than an xfer unit).  */
  91   void (*collect_ptrace_register) (int regno, char *buf);
  92   void (*supply_ptrace_register) (int regno, const char *buf);
  93
  94   /* Hook to convert from target format to ptrace format and back.
  95      Returns true if any conversion was done; false otherwise.
  96      If DIRECTION is 1, then copy from INF to NATIVE.
  97      If DIRECTION is 0, copy from NATIVE to INF.  */
  98   int (*siginfo_fixup) (struct siginfo *native, void *inf, int direction);
  99 };
 100
 101 extern struct linux_target_ops the_low_target;
 102
 103 #define pid_of(proc) ptid_get_pid ((proc)->head.id)
 104 #define lwpid_of(proc) ptid_get_lwp ((proc)->head.id)
 105
 106 #define get_lwp(inf) ((struct lwp_info *)(inf))
 107 #define get_thread_lwp(thr) (get_lwp (inferior_target_data (thr)))
 108 #define get_lwp_thread(proc) ((struct thread_info *)                    \
 109                               find_inferior_id (&all_threads,           \
 110                                                 get_lwp (proc)->head.id))
 111
 112 struct lwp_info
 113 {
 114   struct inferior_list_entry head;
 115
 116   /* If this flag is set, the next SIGSTOP will be ignored (the
 117      process will be immediately resumed).  This means that either we
 118      sent the SIGSTOP to it ourselves and got some other pending event
 119      (so the SIGSTOP is still pending), or that we stopped the
 120      inferior implicitly via PTRACE_ATTACH and have not waited for it
 121      yet.  */
 122   int stop_expected;
 123
 124   /* True if this thread was suspended (with vCont;t).  */
 125   int suspended;
 126
 127   /* If this flag is set, the lwp is known to be stopped right now (stop
 128      event already received in a wait()).  */
 129   int stopped;
 130
 131   /* If this flag is set, the lwp is known to be dead already (exit
 132      event already received in a wait(), and is cached in
 133      status_pending).  */
 134   int dead;
 135
 136   /* When stopped is set, the last wait status recorded for this lwp.  */
 137   int last_status;
 138
 139   /* If this flag is set, STATUS_PENDING is a waitstatus that has not yet
 140      been reported.  */
 141   int status_pending_p;
 142   int status_pending;
 143
 144   /* If this flag is set, the pending status is a (GDB-placed) breakpoint.  */
 145   int pending_is_breakpoint;
 146   CORE_ADDR pending_stop_pc;
 147
 148   /* If this is non-zero, it is a breakpoint to be reinserted at our next
 149      stop (SIGTRAP stops only).  */
 150   CORE_ADDR bp_reinsert;
 151
 152   /* If this flag is set, the last continue operation on this process
 153      was a single-step.  */
 154   int stepping;
 155
 156   /* If this flag is set, we need to set the event request flags the
 157      next time we see this LWP stop.  */
 158   int must_set_ptrace_flags;
 159
 160   /* If this is non-zero, it points to a chain of signals which need to
 161      be delivered to this process.  */
 162   struct pending_signals *pending_signals;
 163
 164   /* A link used when resuming.  It is initialized from the resume request,
 165      and then processed and cleared in linux_resume_one_lwp.  */
 166
 167   struct thread_resume *resume;
 168
 169   int thread_known;
 170 #ifdef HAVE_THREAD_DB_H
 171   /* The thread handle, used for e.g. TLS access.  Only valid if
 172      THREAD_KNOWN is set.  */
 173   td_thrhandle_t th;
 174 #endif
 175 };
 176
 177 extern struct inferior_list all_lwps;
 178
 179 char *linux_child_pid_to_exec_file (int pid);
 180 int elf_64_file_p (const char *file);
 181
 182 void linux_attach_lwp (unsigned long pid);
 183
 184 int thread_db_init (int use_events);
 185 int thread_db_get_tls_address (struct thread_info *thread, CORE_ADDR offset,
 186                                CORE_ADDR load_module, CORE_ADDR *address);
 187
 188 struct lwp_info *find_lwp_pid (ptid_t ptid);