user mode: fix segments

Makefile

@@ -39,5 +39,5 @@ clean:
 
 run: myos.iso
 	@echo "  QEMU"
-	@qemu-system-i386 -drive file=$<,index=2,media=cdrom -monitor stdio -no-reboot -s -S #-d int
+	@qemu-system-i386 -drive file=$<,index=2,media=cdrom -monitor stdio -no-reboot #-s -S #-d int
 

idt.cpp

@@ -62,10 +62,22 @@ struct StubEntry
 
         asm volatile(R"(
             pusha
+            mov %%ds, %%ax
+            push %%ax
+            mov $0x10, %%ax
+            mov %%ax, %%ds
+            mov %%ax, %%es
+            mov %%ax, %%fs
+            mov %%ax, %%gs
             push %0
             cld
             call interruptGeneralHandler
             pop %%eax
+            pop %%ax
+            mov %%ax, %%ds
+            mov %%ax, %%es
+            mov %%ax, %%fs
+            mov %%ax, %%gs
             popa
             add $0x4, %%esp
             iret

idt.hpp

@@ -7,6 +7,7 @@
 struct Registers
 {
     std::uint32_t inum;
+    std::uint32_t ds;
     std::uint32_t edi, esi, ebp, esp, ebx, edx, ecx, eax;
     std::uint32_t error;
     std::uint32_t eip, cs, eflags;