Added functions to portably manipulate process context

include/platform/context.h

@@ -2,10 +2,25 @@
 
 struct process_context_t;
 
-void *initialize_context(void *task_entry);
+/**
+ * @brief Allocates a new process context and initializes it with the given 
+ * program counter.
+ * 
+ * @param task_entry 
+ * @return void* 
+ */
+void *initialize_context(void *pc);
 
 void destroy_context(void *ctx);
 
 void save_context(struct process_context_t *context);
 
 void load_context(struct process_context_t *context);
+
+void set_context_pc(struct process_context_t *context, void *pc);
+
+void set_context_stack(struct process_context_t *context, void *stack);
+
+void set_context_flags(struct process_context_t *context, unsigned long flags);
+
+void set_context_return(struct process_context_t *context, unsigned long value);

src/x86/context.c

@@ -43,3 +43,23 @@ void save_context(struct process_context_t *context)
 {
     store_active_context(context, sizeof(*context));
 }
+
+void set_context_pc(struct process_context_t *context, void *pc)
+{
+    context->eip = pc;
+}
+
+void set_context_stack(struct process_context_t *context, void *stack)
+{
+    context->esp = stack;
+}
+
+void set_context_flags(struct process_context_t *context, unsigned long flags)
+{
+    context->flags = flags;
+}
+
+void set_context_return(struct process_context_t *context, unsigned long value)
+{
+    context->eax = value;
+}