programs/winedbg/be_cpu.h

   1 /*
   2  * Debugger CPU backend definitions
   3  *
   4  * Copyright 2004 Eric Pouech
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library 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 GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 enum be_cpu_addr {be_cpu_addr_pc, be_cpu_addr_stack, be_cpu_addr_frame};
  22 enum be_xpoint_type {be_xpoint_break, be_xpoint_watch_exec, be_xpoint_watch_read,
  23                      be_xpoint_watch_write};
  24 struct backend_cpu
  25 {
  26     /* ------------------------------------------------------------------------------
  27      * address manipulation
  28      * ------------------------------------------------------------------------------ */
  29     /* Linearizes an address. Only CPUs with segmented address model need this.
  30      * Otherwise, implementation is straigthforward (be_cpu_linearize will do)
  31      */
  32     void*               (*linearize)(HANDLE hThread, const ADDRESS*);
  33     /* Fills in an ADDRESS structure from a segment & an offset. CPUs without
  34      * segment address model should use 0 as seg. Required method to fill
  35      * in an ADDRESS (except an linear one).
  36      * Non segmented CPU shall use be_cpu_build_addr
  37      */
  38     unsigned            (*build_addr)(HANDLE hThread, const CONTEXT* ctx,
  39                                       ADDRESS* addr, unsigned seg,
  40                                       unsigned long offset);
  41     /* Retrieves in addr an address related to the context (program counter, stack
  42      * pointer, frame pointer)
  43      */
  44     unsigned            (*get_addr)(HANDLE hThread, const CONTEXT* ctx,
  45                                     enum be_cpu_addr, ADDRESS* addr);
  46     /* -------------------------------------------------------------------------------
  47      * context manipulation
  48      * ------------------------------------------------------------------------------- */
  49     /* Enables/disables CPU single step mode (depending on enable) */
  50     void                (*single_step)(CONTEXT* ctx, unsigned enable);
  51     /* Dumps out the content of the context */
  52     void                (*print_context)(HANDLE hThread, const CONTEXT* ctx);
  53     /* Prints information about segments. Non segmented CPU should leave this
  54      * function empty
  55      */
  56     void                (*print_segment_info)(HANDLE hThread, const CONTEXT* ctx);
  57     /* Do the initialization so that the debugger has internal variables linked
  58      * to the context's registers
  59      */
  60     const struct dbg_internal_var*
  61                         (*init_registers)(CONTEXT* ctx);
  62     /* -------------------------------------------------------------------------------
  63      * code inspection
  64      * -------------------------------------------------------------------------------*/
  65     /* Check whether the instruction at addr is an insn to step over
  66      * (like function call, interruption...)
  67      */
  68     unsigned            (*is_step_over_insn)(const void* addr);
  69     /* Check whether instruction at 'addr' is the return from a function call */
  70     unsigned            (*is_function_return)(const void* addr);
  71     /* Check whether instruction at 'addr' is the CPU break instruction. On i386,
  72      * it's INT3 (0xCC)
  73      */
  74     unsigned            (*is_break_insn)(const void*);
  75     /* Check whether instruciton at 'addr' is a function call */
  76     unsigned            (*is_function_call)(const void* insn, ADDRESS* callee);
  77     /* Ask for dissasembling one instruction. If display is true, assembly code
  78      * will be printed. In all cases, 'addr' is advanced at next instruction
  79      */
  80     void                (*disasm_one_insn)(ADDRESS* addr, int display);
  81     /* -------------------------------------------------------------------------------
  82      * break points / watchpoints handling
  83      * -------------------------------------------------------------------------------*/
  84     /* Inserts an Xpoint in the CPU context and/or debuggee address space */
  85     unsigned            (*insert_Xpoint)(HANDLE hProcess, CONTEXT* ctx,
  86                                          enum be_xpoint_type type, void* addr,
  87                                          unsigned long* val, unsigned size);
  88     /* Removes an Xpoint in the CPU context and/or debuggee address space */
  89     unsigned            (*remove_Xpoint)(HANDLE hProcess, CONTEXT* ctx,
  90                                          enum be_xpoint_type type, void* addr,
  91                                          unsigned long val, unsigned size);
  92     /* Checks whether a given watchpoint has been triggered */
  93     unsigned            (*is_watchpoint_set)(const CONTEXT* ctx, unsigned idx);
  94     /* Clears the watchpoint indicator */
  95     void                (*clear_watchpoint)(CONTEXT* ctx, unsigned idx);
  96     /* After a break instruction is executed, in the corresponding exception handler,
  97      * some CPUs report the address of the insn after the break insn, some others
  98      * report the address of the break insn itself.
  99      * This function lets adjust the context PC to reflect this behavior.
 100      */
 101     int                 (*adjust_pc_for_break)(CONTEXT* ctx, BOOL way);
 102     /* -------------------------------------------------------------------------------
 103      * basic type read/write
 104      * -------------------------------------------------------------------------------*/
 105     /* Reads an integer from memory and stores it inside a long long int */
 106     int                 (*fetch_integer)(const struct dbg_lvalue* lvalue, unsigned size, unsigned is_signed, long long int*);
 107     /* Reads a real from memory and stores it inside a long double */
 108     int                 (*fetch_float)(const struct dbg_lvalue* lvalue, unsigned size, long double*);
 109 };
 110
 111 extern struct backend_cpu*      be_cpu;
 112
 113 /* some handy functions for non segmented CPUs */
 114 void*    be_cpu_linearize(HANDLE hThread, const ADDRESS*);
 115 unsigned be_cpu_build_addr(HANDLE hThread, const CONTEXT* ctx, ADDRESS* addr,
 116                            unsigned seg, unsigned long offset);