fixed crashes, mapping, and corrected return address in switch

src/elf.c

@@ -62,7 +62,9 @@ void load_elf(elf_header* elf_start)
     }
 
     // Map the kernel 1:1 in memory
-    page_region(pgdir, 0x0, &_kernel_end);
+    //page_region(pgdir, 0x0, &_kernel_end);
+    for(int i=0;i<7;i++)
+        pgdir[i]=kernel_page_directory[i];
 
     // Allocate two more pages for stack
     page_map(pgdir, highest_vpage + 0x1000);

src/idt.c

@@ -48,7 +48,13 @@ void default_handler(trapframe reg)
 {
     settf(&reg);
     if(reg.trap<32)
-	reg.eip+=2;
+    {
+        serial_writestring("exception from address: ");
+        serial_hexword(reg.eip);
+        serial_writestring("\n");
+	//reg.eip+=2;
+
+    }
     if(handlers[reg.trap]!=NULL)
     {
 	handlers[reg.trap](reg.err);

src/switch.asm

@@ -2,6 +2,9 @@ global context_switch
 context_switch:
         mov eax, [esp+4]
         mov edx, [esp+8]
+        
+        mov ecx, [esp]
+        mov [edx+20], ecx
 
         push ebp
         push ebx