gdb/gnu-nat.h

   1 /* Common things used by the various *gnu-nat.c files
   2    Copyright (C) 1995-2020 Free Software Foundation, Inc.
   3
   4    Written by Miles Bader <miles@gnu.ai.mit.edu>
   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 #ifndef GNU_NAT_H
  20 #define GNU_NAT_H
  21
  22 #include "defs.h"
  23
  24 /* Work around conflict between Mach's 'thread_info' function, and GDB's
  25    'thread_info' class.  Make the former available as 'mach_thread_info'.  */
  26 #define thread_info mach_thread_info
  27 /* Mach headers are not yet ready for C++ compilation.  */
  28 extern "C"
  29 {
  30 #include <mach.h>
  31 }
  32 #undef thread_info
  33 /* Divert 'mach_thread_info' to the original Mach 'thread_info' function.  */
  34 extern __typeof__ (mach_thread_info) mach_thread_info asm ("thread_info");
  35
  36 #include <unistd.h>
  37
  38 #include "inf-child.h"
  39
  40 struct inf;
  41
  42 extern struct inf *gnu_current_inf;
  43
  44 /* Converts a GDB pid to a struct proc.  */
  45 struct proc *inf_tid_to_thread (struct inf *inf, int tid);
  46
  47 typedef void (inf_threads_ftype) (struct proc *thread, void *arg);
  48
  49 /* Call F for every thread in inferior INF, passing ARG as second parameter.  */
  50 void inf_threads (struct inf *inf, inf_threads_ftype *f, void *arg);
  51
  52 /* Makes sure that INF's thread list is synced with the actual process.  */
  53 int inf_update_procs (struct inf *inf);
  54
  55 /* A proc is either a thread, or the task (there can only be one task proc
  56    because it always has the same TID, PROC_TID_TASK).  */
  57 struct proc
  58   {
  59     thread_t port;              /* The task or thread port.  */
  60     int tid;                    /* The GDB pid (actually a thread id).  */
  61     int num;                    /* An id number for threads, to print.  */
  62
  63     mach_port_t saved_exc_port; /* The task/thread's real exception port.  */
  64     mach_port_t exc_port;       /* Our replacement, which for.  */
  65
  66     int sc;                     /* Desired suspend count.   */
  67     int cur_sc;                 /* Implemented suspend count.  */
  68     int run_sc;                 /* Default sc when the program is running.  */
  69     int pause_sc;               /* Default sc when gdb has control.  */
  70     int resume_sc;              /* Sc resulting from the last resume.  */
  71     int detach_sc;              /* SC to leave around when detaching
  72                                    from program.  */
  73
  74     thread_state_data_t state;  /* Registers, &c.  */
  75     int state_valid:1;          /* True if STATE is up to date.  */
  76     int state_changed:1;
  77
  78     int aborted:1;              /* True if thread_abort has been called.  */
  79     int dead:1;                 /* We happen to know it's actually dead.  */
  80
  81     /* Bit mask of registers fetched by gdb.  This is used when we re-fetch
  82        STATE after aborting the thread, to detect that gdb may have out-of-date
  83        information.  */
  84     unsigned long fetched_regs;
  85
  86     struct inf *inf;            /* Where we come from.  */
  87
  88     struct proc *next;
  89   };
  90
  91 /* The task has a thread entry with this TID.  */
  92 #define PROC_TID_TASK   (-1)
  93
  94 #define proc_is_task(proc) ((proc)->tid == PROC_TID_TASK)
  95 #define proc_is_thread(proc) ((proc)->tid != PROC_TID_TASK)
  96
  97 extern int __proc_pid (struct proc *proc);
  98
  99 /* Return printable description of proc.  */
 100 extern char *proc_string (struct proc *proc);
 101
 102 #define proc_debug(_proc, msg, args...) \
 103   do { struct proc *__proc = (_proc); \
 104        debug ("{proc %d/%d %s}: " msg, \
 105               __proc_pid (__proc), __proc->tid, \
 106               host_address_to_string (__proc) , ##args); } while (0)
 107
 108 extern bool gnu_debug_flag;
 109
 110 #define debug(msg, args...) \
 111  do { if (gnu_debug_flag) \
 112         fprintf_unfiltered (gdb_stdlog, "%s:%d: " msg "\r\n", \
 113                             __FILE__ , __LINE__ , ##args); } while (0)
 114
 115 /* A prototype generic GNU/Hurd target.  The client can override it
 116    with local methods.  */
 117
 118 struct gnu_nat_target : public inf_child_target
 119 {
 120   void attach (const char *, int) override;
 121   bool attach_no_wait () override
 122   { return true; }
 123
 124   void detach (inferior *, int) override;
 125   void resume (ptid_t, int, enum gdb_signal) override;
 126
 127   ptid_t wait (ptid_t, struct target_waitstatus *, int) override;
 128   enum target_xfer_status xfer_partial (enum target_object object,
 129                                         const char *annex,
 130                                         gdb_byte *readbuf,
 131                                         const gdb_byte *writebuf,
 132                                         ULONGEST offset, ULONGEST len,
 133                                         ULONGEST *xfered_len) override;
 134
 135   int find_memory_regions (find_memory_region_ftype func, void *data)
 136     override;
 137   void kill () override;
 138
 139   void create_inferior (const char *, const std::string &,
 140                         char **, int) override;
 141   void mourn_inferior () override;
 142   bool thread_alive (ptid_t ptid) override;
 143   std::string pid_to_str (ptid_t) override;
 144   void stop (ptid_t) override;
 145
 146   void inf_validate_procs (struct inf *inf);
 147   void inf_suspend (struct inf *inf);
 148   void inf_set_traced (struct inf *inf, int on);
 149   void steal_exc_port (struct proc *proc, mach_port_t name);
 150
 151   /* Make sure that the state field in PROC is up to date, and return a
 152      pointer to it, or 0 if something is wrong.  If WILL_MODIFY is true,
 153      makes sure that the thread is stopped and aborted first, and sets
 154      the state_changed field in PROC to true.  */
 155   thread_state_t proc_get_state (struct proc *proc, int will_modify);
 156
 157 private:
 158   void inf_clear_wait (struct inf *inf);
 159   void inf_cleanup (struct inf *inf);
 160   void inf_startup (struct inf *inf, int pid);
 161   int inf_update_suspends (struct inf *inf);
 162   void inf_set_pid (struct inf *inf, pid_t pid);
 163   void inf_steal_exc_ports (struct inf *inf);
 164   void inf_validate_procinfo (struct inf *inf);
 165   void inf_validate_task_sc (struct inf *inf);
 166   void inf_restore_exc_ports (struct inf *inf);
 167   void inf_set_threads_resume_sc (struct inf *inf,
 168                                 struct proc *run_thread,
 169                                 int run_others);
 170   int inf_set_threads_resume_sc_for_signal_thread (struct inf *inf);
 171   void inf_resume (struct inf *inf);
 172   void inf_set_step_thread (struct inf *inf, struct proc *proc);
 173   void inf_detach (struct inf *inf);
 174   void inf_attach (struct inf *inf, int pid);
 175   void inf_signal (struct inf *inf, enum gdb_signal sig);
 176   void inf_continue (struct inf *inf);
 177
 178   struct proc *make_proc (struct inf *inf, mach_port_t port, int tid);
 179   void proc_abort (struct proc *proc, int force);
 180   struct proc *_proc_free (struct proc *proc);
 181   int proc_update_sc (struct proc *proc);
 182   kern_return_t proc_get_exception_port (struct proc *proc, mach_port_t * port);
 183   kern_return_t proc_set_exception_port (struct proc *proc, mach_port_t port);
 184   mach_port_t _proc_get_exc_port (struct proc *proc);
 185   void proc_steal_exc_port (struct proc *proc, mach_port_t exc_port);
 186   void proc_restore_exc_port (struct proc *proc);
 187   int proc_trace (struct proc *proc, int set);
 188 };
 189
 190 /* The final/concrete instance.  */
 191 extern gnu_nat_target *gnu_target;
 192
 193 #endif /* GNU_NAT_H */