x86_64: properly set kernel data segments on syscall/interrupt entry

kernel-src/arch/x86-64/isr.asm

@@ -41,6 +41,11 @@ isr_%+ i:
 	mov rdi,cr2
 	push rdi
 
+	; set up kernel segments
+	mov rdi, 0x10
+	mov ds, rdi
+	mov es, rdi
+
 	; save ctx pointer and interrupt vector number
 	mov rdi, i
 	mov rsi, rsp

kernel-src/arch/x86-64/syscall.asm

@@ -211,6 +211,10 @@ arch_syscall_entry:
 	mov rbx, cr2
 	push rbx
 
+	mov rbx, 0x10
+	mov es, rbx
+	mov ds, rbx
+
 	; prepare arguments for the functions
 	push r9
 	mov r9, r8