gdb/x86-nat.h

   1 /* Native-dependent code for x86 (i386 and x86-64).
   2
   3    Low level functions to implement Oeprating System specific
   4    code to manipulate x86 debug registers.
   5
   6    Copyright (C) 2009-2019 Free Software Foundation, Inc.
   7
   8    This file is part of GDB.
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  22
  23 #ifndef X86_NAT_H
  24 #define X86_NAT_H 1
  25
  26 #include "breakpoint.h"
  27 #include "nat/x86-dregs.h"
  28 #include "target.h"
  29
  30 /* Hardware-assisted breakpoints and watchpoints.  */
  31
  32 /* Use this function to set x86_dr_low debug_register_length field
  33    rather than setting it directly to check that the length is only
  34    set once.  It also enables the 'maint set/show show-debug-regs'
  35    command.  */
  36
  37 extern void x86_set_debug_register_length (int len);
  38
  39 /* Use this function to reset the x86-nat.c debug register state.  */
  40
  41 extern void x86_cleanup_dregs (void);
  42
  43 /* Called whenever GDB is no longer debugging process PID.  It deletes
  44    data structures that keep track of debug register state.  */
  45
  46 extern void x86_forget_process (pid_t pid);
  47
  48 /* Helper functions used by x86_nat_target below.  See their
  49    definitions.  */
  50
  51 extern int x86_can_use_hw_breakpoint (enum bptype type, int cnt, int othertype);
  52 extern int x86_region_ok_for_hw_watchpoint (CORE_ADDR addr, int len);
  53 extern int x86_stopped_by_watchpoint ();
  54 extern int x86_stopped_data_address (CORE_ADDR *addr_p);
  55 extern int x86_insert_watchpoint (CORE_ADDR addr, int len,
  56                            enum target_hw_bp_type type,
  57                            struct expression *cond);
  58 extern int x86_remove_watchpoint (CORE_ADDR addr, int len,
  59                            enum target_hw_bp_type type,
  60                            struct expression *cond);
  61 extern int x86_insert_hw_breakpoint (struct gdbarch *gdbarch,
  62                               struct bp_target_info *bp_tgt);
  63 extern int x86_remove_hw_breakpoint (struct gdbarch *gdbarch,
  64                                      struct bp_target_info *bp_tgt);
  65 extern int x86_stopped_by_hw_breakpoint ();
  66
  67 /* Convenience template mixin used to add x86 watchpoints support to a
  68    target.  */
  69
  70 template <typename BaseTarget>
  71 struct x86_nat_target : public BaseTarget
  72 {
  73   /* Hook in the x86 hardware watchpoints/breakpoints support.  */
  74
  75   int can_use_hw_breakpoint (enum bptype type, int cnt, int othertype) override
  76   { return x86_can_use_hw_breakpoint (type, cnt, othertype); }
  77
  78   int region_ok_for_hw_watchpoint (CORE_ADDR addr, int len) override
  79   { return x86_region_ok_for_hw_watchpoint (addr, len); }
  80
  81   int insert_watchpoint (CORE_ADDR addr, int len,
  82                          enum target_hw_bp_type type,
  83                          struct expression *cond) override
  84   { return x86_insert_watchpoint (addr, len, type, cond); }
  85
  86   int remove_watchpoint (CORE_ADDR addr, int len,
  87                          enum target_hw_bp_type type,
  88                          struct expression *cond) override
  89   { return x86_remove_watchpoint (addr, len, type, cond); }
  90
  91   int insert_hw_breakpoint (struct gdbarch *gdbarch,
  92                             struct bp_target_info *bp_tgt) override
  93   { return x86_insert_hw_breakpoint (gdbarch, bp_tgt); }
  94
  95   int remove_hw_breakpoint (struct gdbarch *gdbarch,
  96                             struct bp_target_info *bp_tgt) override
  97   { return x86_remove_hw_breakpoint (gdbarch, bp_tgt); }
  98
  99   bool stopped_by_watchpoint () override
 100   { return x86_stopped_by_watchpoint (); }
 101
 102   bool stopped_data_address (CORE_ADDR *addr_p) override
 103   { return x86_stopped_data_address (addr_p); }
 104
 105   /* A target must provide an implementation of the
 106      "supports_stopped_by_hw_breakpoint" target method before this
 107      callback will be used.  */
 108   bool stopped_by_hw_breakpoint () override
 109   { return x86_stopped_by_hw_breakpoint (); }
 110 };
 111
 112 #endif /* X86_NAT_H */