gdb/nat/mips-linux-watch.h

   1 /* Copyright (C) 2009-2019 Free Software Foundation, Inc.
   2
   3    This file is part of GDB.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 #ifndef MIPS_LINUX_WATCH_H
  19 #define MIPS_LINUX_WATCH_H 1
  20
  21 #include <asm/ptrace.h>
  22 #include "break-common.h"
  23
  24 #define MAX_DEBUG_REGISTER 8
  25
  26 /* If macro PTRACE_GET_WATCH_REGS is not defined, kernel header doesn't
  27    have hardware watchpoint-related structures.  Define them below.  */
  28
  29 #ifndef PTRACE_GET_WATCH_REGS
  30 #  define PTRACE_GET_WATCH_REGS 0xd0
  31 #  define PTRACE_SET_WATCH_REGS 0xd1
  32
  33 enum pt_watch_style {
  34   pt_watch_style_mips32,
  35   pt_watch_style_mips64
  36 };
  37
  38 /* A value of zero in a watchlo indicates that it is available.  */
  39
  40 struct mips32_watch_regs
  41 {
  42   uint32_t watchlo[MAX_DEBUG_REGISTER];
  43   /* Lower 16 bits of watchhi.  */
  44   uint16_t watchhi[MAX_DEBUG_REGISTER];
  45   /* Valid mask and I R W bits.
  46    * bit 0 -- 1 if W bit is usable.
  47    * bit 1 -- 1 if R bit is usable.
  48    * bit 2 -- 1 if I bit is usable.
  49    * bits 3 - 11 -- Valid watchhi mask bits.
  50    */
  51   uint16_t watch_masks[MAX_DEBUG_REGISTER];
  52   /* The number of valid watch register pairs.  */
  53   uint32_t num_valid;
  54   /* There is confusion across gcc versions about structure alignment,
  55      so we force 8 byte alignment for these structures so they match
  56      the kernel even if it was build with a different gcc version.  */
  57 } __attribute__ ((aligned (8)));
  58
  59 struct mips64_watch_regs
  60 {
  61   uint64_t watchlo[MAX_DEBUG_REGISTER];
  62   uint16_t watchhi[MAX_DEBUG_REGISTER];
  63   uint16_t watch_masks[MAX_DEBUG_REGISTER];
  64   uint32_t num_valid;
  65 } __attribute__ ((aligned (8)));
  66
  67 struct pt_watch_regs
  68 {
  69   enum pt_watch_style style;
  70   union
  71   {
  72     struct mips32_watch_regs mips32;
  73     struct mips64_watch_regs mips64;
  74   };
  75 };
  76
  77 #endif /* !PTRACE_GET_WATCH_REGS */
  78
  79 #define W_BIT 0
  80 #define R_BIT 1
  81 #define I_BIT 2
  82
  83 #define W_MASK (1 << W_BIT)
  84 #define R_MASK (1 << R_BIT)
  85 #define I_MASK (1 << I_BIT)
  86
  87 #define IRW_MASK (I_MASK | R_MASK | W_MASK)
  88
  89 /* We keep list of all watchpoints we should install and calculate the
  90    watch register values each time the list changes.  This allows for
  91    easy sharing of watch registers for more than one watchpoint.  */
  92
  93 struct mips_watchpoint
  94 {
  95   CORE_ADDR addr;
  96   int len;
  97   enum target_hw_bp_type type;
  98   struct mips_watchpoint *next;
  99 };
 100
 101 uint32_t mips_linux_watch_get_num_valid (struct pt_watch_regs *regs);
 102 uint32_t mips_linux_watch_get_irw_mask (struct pt_watch_regs *regs, int n);
 103 CORE_ADDR mips_linux_watch_get_watchlo (struct pt_watch_regs *regs, int n);
 104 void mips_linux_watch_set_watchlo (struct pt_watch_regs *regs, int n,
 105                                    CORE_ADDR value);
 106 uint32_t mips_linux_watch_get_watchhi (struct pt_watch_regs *regs, int n);
 107 void mips_linux_watch_set_watchhi (struct pt_watch_regs *regs, int n,
 108                                    uint16_t value);
 109 int mips_linux_watch_try_one_watch (struct pt_watch_regs *regs,
 110                                     CORE_ADDR addr, int len, uint32_t irw);
 111 void mips_linux_watch_populate_regs (struct mips_watchpoint *current_watches,
 112                                      struct pt_watch_regs *regs);
 113 uint32_t mips_linux_watch_type_to_irw (enum target_hw_bp_type type);
 114
 115 int mips_linux_read_watch_registers (long lwpid,
 116                                      struct pt_watch_regs *watch_readback,
 117                                      int *watch_readback_valid, int force);
 118 #endif