it all broke. im just going to rewrite it all

Makefile

@@ -27,7 +27,7 @@ kernel.elf: obj/kernel/entry.o ${CO_FILES} ${AO_FILES}
 	i386-elf-ld -o $@ -Ttext 0x1000 $^
 
 run: clean os-image.bin
-	qemu-system-x86_64 -hdd os-image.bin
+	qemu-system-x86_64 -hdd os-image.bin -d int
 
 debug: clean os-image.bin kernel.elf
 	qemu-system-x86_64 -s -S -hdd os-image.bin &

src/boot/protected/gdt.asm

@@ -14,12 +14,12 @@ gdt_code:
 
 ; GDT for data segment
 gdt_data:
-    dw 0xffff
+    dw 0xffff ; segment length
-    dw 0x0
+    dw 0x0 ; segment base
-    db 0x0
+    db 0x0 ; segment base
-    db 10010010b
+    db 10010010b ; flags
-    db 11001111b
+    db 11001111b ; flags + segment length
-    db 0x0
+    db 0x0 ; segment base
 
 gdt_end:
 

src/kernel/platform/interrupts/int.c

@@ -1,8 +1,14 @@
 #include "int.h"
 #include "../../print.h"
 
-void exception_handler() {
+int count = 0;
+
+void exception_handler(registers_t r) {
     print_str("I");
+    count++;
+    if (count > 4) {
+        __asm__ __volatile__("cli; hlt");
+    }  
 }
 
 void idt_set_descriptor(u8 vector, void* isr, u8 flags) {

src/kernel/platform/interrupts/int.h

@@ -21,8 +21,15 @@ typedef struct {
 
 static idtr_t idtr;
 
+typedef struct {
+   u32 ds; /* Data segment selector */
+   u32 edi, esi, ebp, esp, ebx, edx, ecx, eax; /* Pushed by pusha. */
+   u32 int_no, err_code; /* Interrupt number and error code (if applicable) */
+   u32 eip, cs, eflags, useresp, ss; /* Pushed by the processor automatically */
+} registers_t;
+
 __attribute__((noreturn))
-void exception_handler(void);
+void exception_handler(registers_t r);
 
 void idt_set_descriptor(u8 vector, void* isr, u8 flags);
 

src/kernel/platform/interrupts/int_lowlevel.asm

@@ -1,16 +1,64 @@
 %macro isr_err_stub 1
 isr_stub_%+%1:
-    call exception_handler
+    push byte %1 ; Push interrupt no to stack
-    iret 
+
+    ; 1. Save CPU state
+	pusha ; Pushes edi,esi,ebp,esp,ebx,edx,ecx,eax
+	mov ax, ds ; Lower 16-bits of eax = ds.
+	push eax ; save the data segment descriptor
+	mov ax, 0x10  ; kernel data segment descriptor
+	mov ds, ax
+	mov es, ax
+	mov fs, ax
+	mov gs, ax
+	
+    ; 2. Call C handler
+	call exception_handler
+	
+    ; 3. Restore state
+	pop eax 
+	mov ds, ax
+	mov es, ax
+	mov fs, ax
+	mov gs, ax
+	popa
+	add esp, 8 ; Cleans up the pushed error code and pushed ISR number
+	sti
+	iret ; pops 5 things at once: CS, EIP, EFLAGS, SS, and ESP
 %endmacro
 ; if writing for 64-bit, use iretq instead
 %macro isr_no_err_stub 1
 isr_stub_%+%1:
-    call exception_handler
+    push byte 0  ; No error occured
-    iret
+    push byte %1 ; Push interrupt no to stack
+    
+    ; 1. Save CPU state
+	pusha ; Pushes edi,esi,ebp,esp,ebx,edx,ecx,eax
+	mov ax, ds ; Lower 16-bits of eax = ds.
+	push eax ; save the data segment descriptor
+	mov ax, 0x10  ; kernel data segment descriptor
+	mov ds, ax
+	mov es, ax
+	mov fs, ax
+	mov gs, ax
+	
+    ; 2. Call C handler
+	call exception_handler
+	
+    ; 3. Restore state
+	pop eax 
+	mov ds, ax
+	mov es, ax
+	mov fs, ax
+	mov gs, ax
+	popa
+	add esp, 8 ; Cleans up the pushed error code and pushed ISR number
+	sti
+	iret ; pops 5 things at once: CS, EIP, EFLAGS, SS, and ESP
 %endmacro
 
 extern exception_handler
+
 isr_no_err_stub 0
 isr_no_err_stub 1
 isr_no_err_stub 2