gdb/nat/linux-nat.h

   1 /* Code for native debugging support for GNU/Linux (LWP layer).
   2
   3    Copyright (C) 2000-2017 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 #ifndef LINUX_NAT_H
  21 #define LINUX_NAT_H
  22
  23 #include "target/waitstatus.h"
  24
  25 struct lwp_info;
  26 struct arch_lwp_info;
  27
  28 /* This is the kernel's hard limit.  Not to be confused with SIGRTMIN.  */
  29 #ifndef __SIGRTMIN
  30 #define __SIGRTMIN 32
  31 #endif
  32
  33 /* Unlike other extended result codes, WSTOPSIG (status) on
  34    PTRACE_O_TRACESYSGOOD syscall events doesn't return SIGTRAP, but
  35    instead SIGTRAP with bit 7 set.  */
  36 #define SYSCALL_SIGTRAP (SIGTRAP | 0x80)
  37
  38 /* Return the ptid of the current lightweight process.  With NPTL
  39    threads and LWPs map 1:1, so this is equivalent to returning the
  40    ptid of the current thread.  This function must be provided by
  41    the client. */
  42
  43 extern ptid_t current_lwp_ptid (void);
  44
  45 /* Function type for the CALLBACK argument of iterate_over_lwps.  */
  46 typedef int (iterate_over_lwps_ftype) (struct lwp_info *lwp, void *arg);
  47
  48 /* Iterate over all LWPs.  Calls CALLBACK with its second argument set
  49    to DATA for every LWP in the list.  If CALLBACK returns nonzero for
  50    a particular LWP, return a pointer to the structure describing that
  51    LWP immediately.  Otherwise return NULL.  This function must be
  52    provided by the client.  */
  53
  54 extern struct lwp_info *iterate_over_lwps (ptid_t filter,
  55                                            iterate_over_lwps_ftype callback,
  56                                            void *data);
  57
  58 /* Return the ptid of LWP.  */
  59
  60 extern ptid_t ptid_of_lwp (struct lwp_info *lwp);
  61
  62 /* Set the architecture-specific data of LWP.  This function must be
  63    provided by the client. */
  64
  65 extern void lwp_set_arch_private_info (struct lwp_info *lwp,
  66                                        struct arch_lwp_info *info);
  67
  68 /* Return the architecture-specific data of LWP.  This function must
  69    be provided by the client. */
  70
  71 extern struct arch_lwp_info *lwp_arch_private_info (struct lwp_info *lwp);
  72
  73 /* Return nonzero if LWP is stopped, zero otherwise.  This function
  74    must be provided by the client.  */
  75
  76 extern int lwp_is_stopped (struct lwp_info *lwp);
  77
  78 /* Return the reason the LWP last stopped.  This function must be
  79    provided by the client.  */
  80
  81 extern enum target_stop_reason lwp_stop_reason (struct lwp_info *lwp);
  82
  83 /* Cause LWP to stop.  This function must be provided by the
  84    client.  */
  85
  86 extern void linux_stop_lwp (struct lwp_info *lwp);
  87
  88 /* Return nonzero if we are single-stepping this LWP at the ptrace
  89    level.  */
  90
  91 extern int lwp_is_stepping (struct lwp_info *lwp);
  92
  93 #endif /* LINUX_NAT_H */