winedbg: Cleanup the process_io usage.

programs/winedbg/be_alpha.c

@@ -82,7 +82,7 @@ static void be_alpha_disasm_one_insn(ADDRESS* addr, int display)
     dbg_printf("Disasm NIY\n");
 }
 
-static unsigned be_alpha_insert_Xpoint(HANDLE hProcess, struct be_process_io* pio,
+static unsigned be_alpha_insert_Xpoint(HANDLE hProcess, const struct be_process_io* pio,
                                        CONTEXT* ctx, enum be_xpoint_type type,
                                        void* addr, unsigned long* val, unsigned size)
 {
@@ -104,9 +104,9 @@ static unsigned be_alpha_insert_Xpoint(HANDLE hProcess, struct be_process_io* pi
     return 1;
 }
 
-static unsigned be_alpha_remove_Xpoint(HANDLE hProcess, CONTEXT* ctx, 
-                                     enum be_xpoint_type type, void* addr, 
-                                     unsigned long val, unsigned size)
+static unsigned be_alpha_remove_Xpoint(HANDLE hProcess, const struct be_process_io* pio,
+                                       CONTEXT* ctx, enum be_xpoint_type type, 
+                                       void* addr, unsigned long val, unsigned size)
 {
     dbg_printf("not done\n");
     return FALSE;

programs/winedbg/be_cpu.h

@@ -82,11 +82,11 @@ struct backend_cpu
      * break points / watchpoints handling 
      * -------------------------------------------------------------------------------*/
     /* Inserts an Xpoint in the CPU context and/or debuggee address space */
-    unsigned            (*insert_Xpoint)(HANDLE hProcess, struct be_process_io* pio,
+    unsigned            (*insert_Xpoint)(HANDLE hProcess, const struct be_process_io* pio,
                                          CONTEXT* ctx, enum be_xpoint_type type,
                                          void* addr, unsigned long* val, unsigned size);
     /* Removes an Xpoint in the CPU context and/or debuggee address space */
-    unsigned            (*remove_Xpoint)(HANDLE hProcess, struct be_process_io* pio,
+    unsigned            (*remove_Xpoint)(HANDLE hProcess, const struct be_process_io* pio,
                                          CONTEXT* ctx, enum be_xpoint_type type,
                                          void* addr, unsigned long val, unsigned size);
     /* Checks whether a given watchpoint has been triggered */

programs/winedbg/be_i386.c

@@ -392,7 +392,7 @@ static inline int be_i386_get_unused_DR(CONTEXT* ctx, unsigned long** r)
     return -1;
 }
 
-static unsigned be_i386_insert_Xpoint(HANDLE hProcess, struct be_process_io* pio, 
+static unsigned be_i386_insert_Xpoint(HANDLE hProcess, const struct be_process_io* pio, 
                                       CONTEXT* ctx, enum be_xpoint_type type, 
                                       void* addr, unsigned long* val, unsigned size)
 {
@@ -443,7 +443,7 @@ static unsigned be_i386_insert_Xpoint(HANDLE hProcess, struct be_process_io* pio
     return 1;
 }
 
-static unsigned be_i386_remove_Xpoint(HANDLE hProcess, struct be_process_io* pio,
+static unsigned be_i386_remove_Xpoint(HANDLE hProcess, const struct be_process_io* pio,
                                       CONTEXT* ctx, enum be_xpoint_type type, 
                                       void* addr, unsigned long val, unsigned size)
 {

programs/winedbg/be_ppc.c

@@ -95,7 +95,7 @@ static void be_ppc_disasm_one_insn(ADDRESS* addr, int display)
     dbg_printf("Disasm NIY\n");
 }
 
-static unsigned be_ppc_insert_Xpoint(HANDLE hProcess, struct be_process_io* pio,
+static unsigned be_ppc_insert_Xpoint(HANDLE hProcess, const struct be_process_io* pio,
                                      CONTEXT* ctx, enum be_xpoint_type type,
                                      void* addr, unsigned long* val, unsigned size)
 {
@@ -117,7 +117,7 @@ static unsigned be_ppc_insert_Xpoint(HANDLE hProcess, struct be_process_io* pio,
     return 1;
 }
 
-static unsigned be_ppc_remove_Xpoint(HANDLE hProcess, struct be_process_io* pio,
+static unsigned be_ppc_remove_Xpoint(HANDLE hProcess, const struct be_process_io* pio,
                                      CONTEXT* ctx, enum be_xpoint_type type,
                                      void* addr, unsigned long val, unsigned size)
 {

programs/winedbg/debugger.h

@@ -201,7 +201,7 @@ struct dbg_process
 {
     HANDLE			handle;
     DWORD			pid;
-    struct be_process_io*       process_io;
+    const struct be_process_io* process_io;
     const char*			imageName;
     struct dbg_thread*  	threads;
     unsigned			continue_on_first_exception;
@@ -417,13 +417,13 @@ extern BOOL             gdb_remote(unsigned int);
 static inline BOOL dbg_read_memory(const void* addr, void* buffer, size_t len)
 {
     DWORD rlen;
-    return ReadProcessMemory(dbg_curr_process->handle, addr, buffer, len, &rlen) && len == rlen;
+    return dbg_curr_process->process_io->read(dbg_curr_process->handle, addr, buffer, len, &rlen) && len == rlen;
 }
 
 static inline BOOL dbg_write_memory(void* addr, const void* buffer, size_t len)
 {
     DWORD wlen;
-    return WriteProcessMemory(dbg_curr_process->handle, addr, buffer, len, &wlen) && len == wlen;
+    return dbg_curr_process->process_io->write(dbg_curr_process->handle, addr, buffer, len, &wlen) && len == wlen;
 }
 
 static inline void* dbg_heap_realloc(void* buffer, size_t size)