gdb/x86-nat.h

   1 /* Native-dependent code for x86 (i386 and x86-64).
   2
   3    Low level functions to implement Operating System specific
   4    code to manipulate x86 debug registers.
   5
   6    Copyright (C) 2009-2022 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 /* Return the debug register state for process PID.  If no existing
  44    state is found for this process, return nullptr.  */
  45
  46 struct x86_debug_reg_state *x86_lookup_debug_reg_state (pid_t pid);
  47
  48 /* Called whenever GDB is no longer debugging process PID.  It deletes
  49    data structures that keep track of debug register state.  */
  50
  51 extern void x86_forget_process (pid_t pid);
  52
  53 /* Helper functions used by x86_nat_target below.  See their
  54    definitions.  */
  55
  56 extern int x86_can_use_hw_breakpoint (enum bptype type, int cnt, int othertype);
  57 extern int x86_region_ok_for_hw_watchpoint (CORE_ADDR addr, int len);
  58 extern int x86_stopped_by_watchpoint ();
  59 extern int x86_stopped_data_address (CORE_ADDR *addr_p);
  60 extern int x86_insert_watchpoint (CORE_ADDR addr, int len,
  61                            enum target_hw_bp_type type,
  62                            struct expression *cond);
  63 extern int x86_remove_watchpoint (CORE_ADDR addr, int len,
  64                            enum target_hw_bp_type type,
  65                            struct expression *cond);
  66 extern int x86_insert_hw_breakpoint (struct gdbarch *gdbarch,
  67                               struct bp_target_info *bp_tgt);
  68 extern int x86_remove_hw_breakpoint (struct gdbarch *gdbarch,
  69                                      struct bp_target_info *bp_tgt);
  70 extern int x86_stopped_by_hw_breakpoint ();
  71
  72 /* Convenience template mixin used to add x86 watchpoints support to a
  73    target.  */
  74
  75 template <typename BaseTarget>
  76 struct x86_nat_target : public BaseTarget
  77 {
  78   /* Hook in the x86 hardware watchpoints/breakpoints support.  */
  79
  80   int can_use_hw_breakpoint (enum bptype type, int cnt, int othertype) override
  81   { return x86_can_use_hw_breakpoint (type, cnt, othertype); }
  82
  83   int region_ok_for_hw_watchpoint (CORE_ADDR addr, int len) override
  84   { return x86_region_ok_for_hw_watchpoint (addr, len); }
  85
  86   int insert_watchpoint (CORE_ADDR addr, int len,
  87                          enum target_hw_bp_type type,
  88                          struct expression *cond) override
  89   { return x86_insert_watchpoint (addr, len, type, cond); }
  90
  91   int remove_watchpoint (CORE_ADDR addr, int len,
  92                          enum target_hw_bp_type type,
  93                          struct expression *cond) override
  94   { return x86_remove_watchpoint (addr, len, type, cond); }
  95
  96   int insert_hw_breakpoint (struct gdbarch *gdbarch,
  97                             struct bp_target_info *bp_tgt) override
  98   { return x86_insert_hw_breakpoint (gdbarch, bp_tgt); }
  99
 100   int remove_hw_breakpoint (struct gdbarch *gdbarch,
 101                             struct bp_target_info *bp_tgt) override
 102   { return x86_remove_hw_breakpoint (gdbarch, bp_tgt); }
 103
 104   bool stopped_by_watchpoint () override
 105   { return x86_stopped_by_watchpoint (); }
 106
 107   bool stopped_data_address (CORE_ADDR *addr_p) override
 108   { return x86_stopped_data_address (addr_p); }
 109
 110   /* A target must provide an implementation of the
 111      "supports_stopped_by_hw_breakpoint" target method before this
 112      callback will be used.  */
 113   bool stopped_by_hw_breakpoint () override
 114   { return x86_stopped_by_hw_breakpoint (); }
 115 };
 116
 117 #endif /* X86_NAT_H */