winedbg: Store for context variables only the offsets of each register (instead of the address of the register in dbg_context).

programs/winedbg/be_alpha.c

@@ -54,12 +54,6 @@ static struct dbg_internal_var be_alpha_ctx[] =
     {0,                 NULL,           0,                                      dbg_itype_none}
 };
 
-static const struct dbg_internal_var* be_alpha_init_registers(CONTEXT* ctx)
-{
-    dbg_printf("not done\n");
-    return be_alpha_ctx;
-}
-
 static unsigned be_alpha_is_step_over_insn(const void* insn)
 {
     dbg_printf("not done\n");
@@ -159,7 +153,7 @@ struct backend_cpu be_alpha =
     be_alpha_single_step,
     be_alpha_print_context,
     be_alpha_print_segment_info,
-    be_alpha_init_registers,
+    be_alpha_ctx,
     be_alpha_is_step_over_insn,
     be_alpha_is_function_return,
     be_alpha_is_break_insn,

programs/winedbg/be_cpu.h

@@ -59,11 +59,9 @@ struct backend_cpu
      * function empty
      */
     void                (*print_segment_info)(HANDLE hThread, const CONTEXT* ctx);
-    /* Do the initialization so that the debugger has internal variables linked
+    /* all the CONTEXT's relative variables, bound to this CPU */
-     * to the context's registers
+    const struct dbg_internal_var* context_vars;
-     */
+
-    const struct dbg_internal_var*
-                        (*init_registers)(CONTEXT* ctx);
     /* -------------------------------------------------------------------------------
      * code inspection 
      * -------------------------------------------------------------------------------*/

programs/winedbg/be_i386.c

@@ -290,15 +290,6 @@ static struct dbg_internal_var be_i386_ctx[] =
     {0,                 NULL,           0,                                      dbg_itype_none}
 };
 
-static const struct dbg_internal_var* be_i386_init_registers(CONTEXT* ctx)
-{
-    struct dbg_internal_var*    div;
-
-    for (div = be_i386_ctx; div->name; div++) 
-        div->pval = (DWORD_PTR*)((char*)ctx + (DWORD)div->pval);
-    return be_i386_ctx;
-}
-
 static unsigned be_i386_is_step_over_insn(const void* insn)
 {
     BYTE	ch;
@@ -754,7 +745,7 @@ struct backend_cpu be_i386 =
     be_i386_single_step,
     be_i386_print_context,
     be_i386_print_segment_info,
-    be_i386_init_registers,
+    be_i386_ctx,
     be_i386_is_step_over_insn,
     be_i386_is_function_return,
     be_i386_is_break_insn,

programs/winedbg/be_ppc.c

@@ -67,12 +67,6 @@ static struct dbg_internal_var be_ppc_ctx[] =
     {0,                 NULL,           0,                                      dbg_itype_none}
 };
 
-static const struct dbg_internal_var* be_ppc_init_registers(CONTEXT* ctx)
-{
-    dbg_printf("not done\n");
-    return be_ppc_ctx;
-}
-
 static unsigned be_ppc_is_step_over_insn(const void* insn)
 {
     dbg_printf("not done\n");
@@ -183,7 +177,7 @@ struct backend_cpu be_ppc =
     be_ppc_single_step,
     be_ppc_print_context,
     be_ppc_print_segment_info,
-    be_ppc_init_registers,
+    be_ppc_ctx,
     be_ppc_is_step_over_insn,
     be_ppc_is_function_return,
     be_ppc_is_break_insn,

programs/winedbg/be_x86_64.c

@@ -153,15 +153,6 @@ static struct dbg_internal_var be_x86_64_ctx[] =
     {0,                 NULL,           0,                                          dbg_itype_none}
 };
 
-static const struct dbg_internal_var* be_x86_64_init_registers(CONTEXT* ctx)
-{
-    struct dbg_internal_var*    div;
-
-    for (div = be_x86_64_ctx; div->name; div++)
-        div->pval = (DWORD_PTR*)((char*)ctx + (DWORD_PTR)div->pval);
-    return be_x86_64_ctx;
-}
-
 #define	f_mod(b)	((b)>>6)
 #define	f_reg(b)	(((b)>>3)&0x7)
 #define	f_rm(b)		((b)&0x7)
@@ -561,7 +552,7 @@ struct backend_cpu be_x86_64 =
     be_x86_64_single_step,
     be_x86_64_print_context,
     be_x86_64_print_segment_info,
-    be_x86_64_init_registers,
+    be_x86_64_ctx,
     be_x86_64_is_step_over_insn,
     be_x86_64_is_function_return,
     be_x86_64_is_break_insn,

programs/winedbg/debugger.h

@@ -488,7 +488,6 @@ static inline void* dbg_heap_realloc(void* buffer, size_t size)
 }
 
 extern struct dbg_internal_var          dbg_internal_vars[];
-extern const struct dbg_internal_var*   dbg_context_vars;
 
 #define  DBG_IVARNAME(_var)	dbg_internal_var_##_var
 #define  DBG_IVARSTRUCT(_var)	dbg_internal_vars[DBG_IVARNAME(_var)]

programs/winedbg/memory.c

@@ -690,7 +690,7 @@ BOOL memory_get_register(DWORD regno, DWORD_PTR** value, char* buffer, int len)
         return FALSE;
     }
 
-    for (div = dbg_context_vars; div->name; div++)
+    for (div = be_cpu->context_vars; div->name; div++)
     {
         if (div->val == regno)
         {
@@ -703,7 +703,7 @@ BOOL memory_get_register(DWORD regno, DWORD_PTR** value, char* buffer, int len)
                 }
             }
             else
-                *value = div->pval;
+                *value = (DWORD_PTR*)((char*)&dbg_context + (DWORD_PTR)div->pval);
 
             if (buffer) lstrcpynA(buffer, div->name, len);
             return TRUE;

programs/winedbg/winedbg.c

@@ -96,7 +96,6 @@ BOOL    	        dbg_interactiveP = FALSE;
 static struct dbg_process*      dbg_process_list = NULL;
 
 struct dbg_internal_var         dbg_internal_vars[DBG_IV_LAST];
-const struct dbg_internal_var*  dbg_context_vars;
 static HANDLE                   dbg_houtput;
 
 static void dbg_outputA(const char* buffer, int len)
@@ -208,8 +207,7 @@ static	unsigned dbg_load_internal_vars(void)
         }
     }
     RegCloseKey(hkey);
-    /* set up the debug variables for the CPU context */
+
-    dbg_context_vars = be_cpu->init_registers(&dbg_context);
     return TRUE;
 }
 
@@ -245,9 +243,16 @@ const struct dbg_internal_var* dbg_get_internal_var(const char* name)
     {
 	if (!strcmp(div->name, name)) return div;
     }
-    for (div = dbg_context_vars; div->name; div++)
+    for (div = be_cpu->context_vars; div->name; div++)
     {
-	if (!strcasecmp(div->name, name)) return div;
+	if (!strcasecmp(div->name, name))
+        {
+            struct dbg_internal_var*    ret = (void*)lexeme_alloc_size(sizeof(*ret));
+            /* relocate register's field against current context */
+            *ret = *div;
+            ret->pval = (DWORD_PTR*)((char*)&dbg_context + (DWORD_PTR)div->pval);
+            return ret;
+        }
     }
 
     return NULL;