[SOLVED] Interrupt handlers not working

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warriorjacq9
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[SOLVED] Interrupt handlers not working

Post by warriorjacq9 »

I am making an operating system following the OSDev tutorials, but my ISRs aren't being called. Instead, Qemu triple faults. Here is my idt.c:

Code: Select all

#include <kernel/idt.h>
#include <stdio.h>
#include <string.h>

__attribute__((aligned(0x10))) 
static idt_entry_t idt[256];
static idtr_t idtr;

unsigned char *exceptions[] = 
{
    "Division by Zero",
    "Debug",
    "Non Maskable Interrupt",
    "Breakpoint",
    "Into Detected Overflow",
    "Out of Bounds",
    "Invalid Opcode",
    "No Coprocessor",
    "Double Fault",
    "Coprocessor Segment Overrun",
    "Bad TSS",
    "Segment Not Present",
    "Stack Fault",
    "General Protection Fault",
    "Page Fault",
    "Unknown Interrupt",
    "Coprocessor Fault",
    "Alignment Check",
    "Machine Check",
    "Reserved",
    "Reserved",
    "Reserved",
    "Reserved",
    "Reserved",
    "Reserved",
    "Reserved",
    "Reserved",
    "Reserved",
    "Reserved",
    "Reserved",
    "Reserved",
    "Reserved",
};

void exception_handler(registers_t *r)
{
    if (r->err_code < 32)
    {
        printf("%s exception. System halted", exceptions[r->err_code]);
        __asm__ volatile ("cli; hlt");
    }
}

void idt_set_descriptor(uint8_t vector, void* isr, uint8_t flags)
{
    idt[vector].isr_low        = (uint32_t)isr & 0xFFFF;
    idt[vector].kernel_cs      = 0x00; // this value can be whatever offset your kernel code selector is in your GDT
    idt[vector].attributes     = flags;
    idt[vector].isr_high       = (uint32_t)isr >> 16;
    idt[vector].reserved       = 0;
}

static bool vectors[IDT_MAX_DESCRIPTORS];

extern void* isr_stub_table[];

void idt_init()
{
    idtr.base = (uintptr_t)&idt[0];
    idtr.limit = (uint16_t)sizeof(idt_entry_t) * IDT_MAX_DESCRIPTORS - 1;

    memset(&idt, 0, sizeof(idt_entry_t) * 256);

    for (uint8_t vector = 0; vector < 32; vector++) {
        idt_set_descriptor(vector, isr_stub_table[vector], 0x8E);
        vectors[vector] = true;
    }

    __asm__ volatile ("lidt %0" : : "m"(idtr)); // load the new IDT
    __asm__ volatile ("sti"); // set the interrupt flag
}
My isr.S:

Code: Select all

.global _isr0
.global _isr1
.global _isr2
.global _isr3
.global _isr4
.global _isr5
.global _isr6
.global _isr7
.global _isr8
.global _isr9
.global _isr10
.global _isr11
.global _isr12
.global _isr13
.global _isr14
.global _isr15
.global _isr16
.global _isr17
.global _isr18
.global _isr19
.global _isr20
.global _isr21
.global _isr22
.global _isr23
.global _isr24
.global _isr25
.global _isr26
.global _isr27
.global _isr28
.global _isr29
.global _isr30
.global _isr31

_isr0: // Divide by Zero
    cli
    push 0
    push 0
    jmp isr_common_stub
_isr1: // Debug
    cli
    push 0
    push 1
    jmp isr_common_stub
_isr2: // Non Maskable Interrupt
    cli
    push 0
    push 2
    jmp isr_common_stub
_isr3: // Breakpoint
    cli
    push 0
    push 3
    jmp isr_common_stub
_isr4: // Into Detected Overflow
    cli
    push 0
    push 4
    jmp isr_common_stub
_isr5: // Out of Bounds
    cli
    push 0
    push 5
    jmp isr_common_stub
_isr6: // Invalid Opcode
    cli
    push 0
    push 6
    jmp isr_common_stub
_isr7: // No Coprocessor
    cli
    push 0
    push 7
    jmp isr_common_stub
_isr8: // Double Fault
    cli
    push 8
    jmp isr_common_stub
_isr9: // Coprocessor Segment Overrun
    cli
    push 0
    push 9
    jmp isr_common_stub
_isr10: // Bad TSS
    cli
    push 10
    jmp isr_common_stub
_isr11: // Segment Not Present
    cli
    push 11
    jmp isr_common_stub
_isr12: // Stack Fault
    cli
    push 12
    jmp isr_common_stub
_isr13: // General Protection
    cli
    push 13
    jmp isr_common_stub
_isr14: // Page Fault
    cli
    push 14
    jmp isr_common_stub
_isr15: // Unknown Interrupt
    cli
    push 0
    push 15
    jmp isr_common_stub
_isr16: // Coprocessor Fault
    cli
    push 0
    push 16
    jmp isr_common_stub
_isr17: // Alignment Check
    cli
    push 0
    push 17
    jmp isr_common_stub
_isr18: // Machine Check
    cli
    push 0
    push 18
    jmp isr_common_stub
_isr19: // Reserved
    cli
    push 0
    push 19
    jmp isr_common_stub
_isr20: // Reserved
    cli
    push 0
    push 20
    jmp isr_common_stub
_isr21: // Reserved
    cli
    push 0
    push 21
    jmp isr_common_stub
_isr22: // Reserved
    cli
    push 0
    push 22
    jmp isr_common_stub
_isr23: // Reserved
    cli
    push 0
    push 23
    jmp isr_common_stub
_isr24: // Reserved
    cli
    push 0
    push 24
    jmp isr_common_stub
_isr25: // Reserved
    cli
    push 0
    push 25
    jmp isr_common_stub
_isr26: // Reserved
    cli
    push 0
    push 26
    jmp isr_common_stub
_isr27: // Reserved
    cli
    push 0
    push 27
    jmp isr_common_stub
_isr28: // Reserved
    cli
    push 0
    push 28
    jmp isr_common_stub
_isr29: // Reserved
    cli
    push 0
    push 29
    jmp isr_common_stub
_isr30: // Reserved
    cli
    push 0
    push 30
    jmp isr_common_stub
_isr31: // Reserved
    cli
    push 0
    push 31
    jmp isr_common_stub

.extern exception_handler

isr_common_stub:
    pusha
    push %ds
    push %es
    push %fs
    push %gs
    mov %ax, 0x10
    mov %ds, %ax
    mov %es, %ax
    mov %fs, %ax
    mov %gs, %ax
    mov %eax, %esp
    push %eax
    mov %eax, exception_handler
    call %eax
    pop %eax
    pop %gs
    pop %fs
    pop %es
    pop %ds
    popa
    add %esp, 8
    iret


.section .data
.macro isr_labelX number
    .long _isr\number
.endm

.altmacro
.global isr_stub_table
isr_stub_table:
.set i,0
.rept 32
    isr_labelX %i
    .set i, i+1
.endr
My kernel main function:

Code: Select all

#include <stdio.h>

#include <kernel/tty.h>
#include <kernel/idt.h>

void kernel_main(void) {
	terminal_initialize();

	idt_init();

	//printf("Hello, kernel World!");
	__asm__ volatile("div %0" :: "r"(0)); // Test the ISRs
}
Qemu log (with -d int)

Code: Select all

DR6=ffff0ff0 DR7=00000400
CCS=00000080 CCD=00000001 CCO=LOGICB  
EFER=0000000000000000
SMM: after RSM
EAX=00000001 EBX=00000000 ECX=02000000 EDX=02000628
ESI=0000000b EDI=02000000 EBP=000f2c72 ESP=00006d98
EIP=000ebaef EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
CS =0008 00000000 ffffffff 00c09b00 DPL=0 CS32 [-RA]
SS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
FS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
GS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy
GDT=     000f6280 00000037
IDT=     000f62be 00000000
CR0=00000011 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000000 CCD=00000000 CCO=EFLAGS  
EFER=0000000000000000
SMM: enter
EAX=000000b5 EBX=000f7bfc ECX=00001234 EDX=00006dff
ESI=00006d3c EDI=07fbedc5 EBP=00006cfc ESP=00006cfc
EIP=00007bfb EFL=00000006 [-----P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =db80 000db800 ffffffff 008f9300
CS =f000 000f0000 ffffffff 008f9b00
SS =0000 00000000 ffffffff 008f9300
DS =0000 00000000 ffffffff 008f9300
FS =0000 00000000 ffffffff 008f9300
GS =0000 00000000 ffffffff 008f9300
LDT=0000 00000000 0000ffff 00008200
TR =0000 00000000 0000ffff 00008b00
GDT=     00000000 00000000
IDT=     00000000 000003ff
CR0=00000010 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000004 CCD=00006cfc CCO=EFLAGS  
EFER=0000000000000000
SMM: after RSM
EAX=000000b5 EBX=000f7bfc ECX=00001234 EDX=00006dff
ESI=00006d3c EDI=07fbedc5 EBP=00006cfc ESP=00006cfc
EIP=000f7bfc EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
CS =0008 00000000 ffffffff 00c09b00 DPL=0 CS32 [-RA]
SS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
FS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
GS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy
GDT=     000f6280 00000037
IDT=     000f62be 00000000
CR0=00000011 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000000 CCD=00000000 CCO=EFLAGS  
EFER=0000000000000000
SMM: enter
EAX=000000b5 EBX=00007c16 ECX=00005678 EDX=07fabb00
ESI=000ea600 EDI=07fbedc5 EBP=00006cfc ESP=00006cfc
EIP=000f7c15 EFL=00000016 [----AP-] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
CS =0008 00000000 ffffffff 00c09b00 DPL=0 CS32 [-RA]
SS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
FS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
GS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy
GDT=     000f6280 00000037
IDT=     000f62be 00000000
CR0=00000011 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000014 CCD=00006ce8 CCO=EFLAGS  
EFER=0000000000000000
SMM: after RSM
EAX=000000b5 EBX=00007c16 ECX=00005678 EDX=07fabb00
ESI=000ea600 EDI=07fbedc5 EBP=00006cfc ESP=00006cfc
EIP=00007c16 EFL=00000006 [-----P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =db80 000db800 ffffffff 00809300
CS =f000 000f0000 ffffffff 00809b00
SS =0000 00000000 ffffffff 00809300
DS =0000 00000000 ffffffff 00809300
FS =0000 00000000 ffffffff 00809300
GS =0000 00000000 ffffffff 00809300
LDT=0000 00000000 0000ffff 00008200
TR =0000 00000000 0000ffff 00008b00
GDT=     00000000 00000000
IDT=     00000000 000003ff
CR0=00000010 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000004 CCD=00000001 CCO=EFLAGS  
EFER=0000000000000000
SMM: enter
EAX=000000b5 EBX=000f7bfc ECX=00001234 EDX=00006aff
ESI=00006a22 EDI=07fbedc5 EBP=000069e2 ESP=000069e2
EIP=00007bfb EFL=00000006 [-----P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =db80 000db800 ffffffff 008f9300
CS =f000 000f0000 ffffffff 008f9b00
SS =0000 00000000 ffffffff 008f9300
DS =0000 00000000 ffffffff 008f9300
FS =0000 00000000 ffffffff 008f9300
GS =ca00 000ca000 ffffffff 008f9300
LDT=0000 00000000 0000ffff 00008200
TR =0000 00000000 0000ffff 00008b00
GDT=     00000000 00000000
IDT=     00000000 000003ff
CR0=00000010 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000004 CCD=000069e2 CCO=EFLAGS  
EFER=0000000000000000
SMM: after RSM
EAX=000000b5 EBX=000f7bfc ECX=00001234 EDX=00006aff
ESI=00006a22 EDI=07fbedc5 EBP=000069e2 ESP=000069e2
EIP=000f7bfc EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
CS =0008 00000000 ffffffff 00c09b00 DPL=0 CS32 [-RA]
SS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
FS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
GS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy
GDT=     000f6280 00000037
IDT=     000f62be 00000000
CR0=00000011 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000000 CCD=00000000 CCO=EFLAGS  
EFER=0000000000000000
SMM: enter
EAX=000000b5 EBX=00007c16 ECX=00005678 EDX=00000005
ESI=00000000 EDI=07fbedc5 EBP=000069e2 ESP=000069e2
EIP=000f7c15 EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
CS =0008 00000000 ffffffff 00c09b00 DPL=0 CS32 [-RA]
SS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
FS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
GS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy
GDT=     000f6280 00000037
IDT=     000f62be 00000000
CR0=00000011 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000000 CCD=000069ce CCO=EFLAGS  
EFER=0000000000000000
SMM: after RSM
EAX=000000b5 EBX=00007c16 ECX=00005678 EDX=00000005
ESI=00000000 EDI=07fbedc5 EBP=000069e2 ESP=000069e2
EIP=00007c16 EFL=00000006 [-----P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =db80 000db800 ffffffff 00809300
CS =f000 000f0000 ffffffff 00809b00
SS =0000 00000000 ffffffff 00809300
DS =0000 00000000 ffffffff 00809300
FS =0000 00000000 ffffffff 00809300
GS =ca00 000ca000 ffffffff 00809300
LDT=0000 00000000 0000ffff 00008200
TR =0000 00000000 0000ffff 00008b00
GDT=     00000000 00000000
IDT=     00000000 000003ff
CR0=00000010 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000004 CCD=00000001 CCO=EFLAGS  
EFER=0000000000000000
SMM: enter
EAX=000000b5 EBX=000f7bfc ECX=00001234 EDX=00006aff
ESI=00006a1c EDI=07fbedc5 EBP=000069dc ESP=000069dc
EIP=00007bfb EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =db80 000db800 ffffffff 00809300
CS =f000 000f0000 ffffffff 00809b00
SS =0000 00000000 ffffffff 00809300
DS =0000 00000000 ffffffff 00809300
FS =0000 00000000 ffffffff 00809300
GS =ca00 000ca000 ffffffff 00809300
LDT=0000 00000000 0000ffff 00008200
TR =0000 00000000 0000ffff 00008b00
GDT=     00000000 00000000
IDT=     00000000 000003ff
CR0=00000010 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000000 CCD=000069dc CCO=EFLAGS  
EFER=0000000000000000
SMM: after RSM
EAX=000000b5 EBX=000f7bfc ECX=00001234 EDX=00006aff
ESI=00006a1c EDI=07fbedc5 EBP=000069dc ESP=000069dc
EIP=000f7bfc EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
CS =0008 00000000 ffffffff 00c09b00 DPL=0 CS32 [-RA]
SS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
FS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
GS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy
GDT=     000f6280 00000037
IDT=     000f62be 00000000
CR0=00000011 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000000 CCD=00000000 CCO=EFLAGS  
EFER=0000000000000000
SMM: enter
EAX=000000b5 EBX=00007c16 ECX=00005678 EDX=00000003
ESI=07f8cb00 EDI=07fbedc5 EBP=000069dc ESP=000069dc
EIP=000f7c15 EFL=00000012 [----A--] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
CS =0008 00000000 ffffffff 00c09b00 DPL=0 CS32 [-RA]
SS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
FS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
GS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy
GDT=     000f6280 00000037
IDT=     000f62be 00000000
CR0=00000011 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000010 CCD=000069c8 CCO=EFLAGS  
EFER=0000000000000000
SMM: after RSM
EAX=000000b5 EBX=00007c16 ECX=00005678 EDX=00000003
ESI=07f8cb00 EDI=07fbedc5 EBP=000069dc ESP=000069dc
EIP=00007c16 EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =db80 000db800 ffffffff 00809300
CS =f000 000f0000 ffffffff 00809b00
SS =0000 00000000 ffffffff 00809300
DS =0000 00000000 ffffffff 00809300
FS =0000 00000000 ffffffff 00809300
GS =ca00 000ca000 ffffffff 00809300
LDT=0000 00000000 0000ffff 00008200
TR =0000 00000000 0000ffff 00008b00
GDT=     00000000 00000000
IDT=     00000000 000003ff
CR0=00000010 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000000 CCD=00000001 CCO=EFLAGS  
EFER=0000000000000000
SMM: enter
EAX=000000b5 EBX=000f7bfc ECX=00001234 EDX=00006aff
ESI=00006a22 EDI=07fbedc5 EBP=000069e2 ESP=000069e2
EIP=00007bfb EFL=00000006 [-----P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =db80 000db800 ffffffff 00809300
CS =f000 000f0000 ffffffff 00809b00
SS =0000 00000000 ffffffff 00809300
DS =0000 00000000 ffffffff 00809300
FS =0000 00000000 ffffffff 00809300
GS =ca00 000ca000 ffffffff 00809300
LDT=0000 00000000 0000ffff 00008200
TR =0000 00000000 0000ffff 00008b00
GDT=     00000000 00000000
IDT=     00000000 000003ff
CR0=00000010 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000004 CCD=000069e2 CCO=EFLAGS  
EFER=0000000000000000
SMM: after RSM
EAX=000000b5 EBX=000f7bfc ECX=00001234 EDX=00006aff
ESI=00006a22 EDI=07fbedc5 EBP=000069e2 ESP=000069e2
EIP=000f7bfc EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
CS =0008 00000000 ffffffff 00c09b00 DPL=0 CS32 [-RA]
SS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
FS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
GS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy
GDT=     000f6280 00000037
IDT=     000f62be 00000000
CR0=00000011 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000000 CCD=00000000 CCO=EFLAGS  
EFER=0000000000000000
SMM: enter
EAX=000000b5 EBX=00007c16 ECX=00005678 EDX=00000005
ESI=00000000 EDI=07fbedc5 EBP=000069e2 ESP=000069e2
EIP=000f7c15 EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
CS =0008 00000000 ffffffff 00c09b00 DPL=0 CS32 [-RA]
SS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
FS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
GS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy
GDT=     000f6280 00000037
IDT=     000f62be 00000000
CR0=00000011 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000000 CCD=000069ce CCO=EFLAGS  
EFER=0000000000000000
SMM: after RSM
EAX=000000b5 EBX=00007c16 ECX=00005678 EDX=00000005
ESI=00000000 EDI=07fbedc5 EBP=000069e2 ESP=000069e2
EIP=00007c16 EFL=00000006 [-----P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =db80 000db800 ffffffff 00809300
CS =f000 000f0000 ffffffff 00809b00
SS =0000 00000000 ffffffff 00809300
DS =0000 00000000 ffffffff 00809300
FS =0000 00000000 ffffffff 00809300
GS =ca00 000ca000 ffffffff 00809300
LDT=0000 00000000 0000ffff 00008200
TR =0000 00000000 0000ffff 00008b00
GDT=     00000000 00000000
IDT=     00000000 000003ff
CR0=00000010 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000004 CCD=00000001 CCO=EFLAGS  
EFER=0000000000000000
SMM: enter
EAX=000000b5 EBX=000f7bfc ECX=00001234 EDX=00006aff
ESI=00006a1c EDI=07fbedc5 EBP=000069dc ESP=000069dc
EIP=00007bfb EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =db80 000db800 ffffffff 00809300
CS =f000 000f0000 ffffffff 00809b00
SS =0000 00000000 ffffffff 00809300
DS =0000 00000000 ffffffff 00809300
FS =0000 00000000 ffffffff 00809300
GS =ca00 000ca000 ffffffff 00809300
LDT=0000 00000000 0000ffff 00008200
TR =0000 00000000 0000ffff 00008b00
GDT=     00000000 00000000
IDT=     00000000 000003ff
CR0=00000010 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000000 CCD=000069dc CCO=EFLAGS  
EFER=0000000000000000
SMM: after RSM
EAX=000000b5 EBX=000f7bfc ECX=00001234 EDX=00006aff
ESI=00006a1c EDI=07fbedc5 EBP=000069dc ESP=000069dc
EIP=000f7bfc EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
CS =0008 00000000 ffffffff 00c09b00 DPL=0 CS32 [-RA]
SS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
FS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
GS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy
GDT=     000f6280 00000037
IDT=     000f62be 00000000
CR0=00000011 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000000 CCD=00000000 CCO=EFLAGS  
EFER=0000000000000000
SMM: enter
EAX=000000b5 EBX=00007c16 ECX=00005678 EDX=00000003
ESI=07eccb00 EDI=07fbedc5 EBP=000069dc ESP=000069dc
EIP=000f7c15 EFL=00000012 [----A--] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
CS =0008 00000000 ffffffff 00c09b00 DPL=0 CS32 [-RA]
SS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
FS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
GS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy
GDT=     000f6280 00000037
IDT=     000f62be 00000000
CR0=00000011 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000010 CCD=000069c8 CCO=EFLAGS  
EFER=0000000000000000
SMM: after RSM
EAX=000000b5 EBX=00007c16 ECX=00005678 EDX=00000003
ESI=07eccb00 EDI=07fbedc5 EBP=000069dc ESP=000069dc
EIP=00007c16 EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =db80 000db800 ffffffff 00809300
CS =f000 000f0000 ffffffff 00809b00
SS =0000 00000000 ffffffff 00809300
DS =0000 00000000 ffffffff 00809300
FS =0000 00000000 ffffffff 00809300
GS =ca00 000ca000 ffffffff 00809300
LDT=0000 00000000 0000ffff 00008200
TR =0000 00000000 0000ffff 00008b00
GDT=     00000000 00000000
IDT=     00000000 000003ff
CR0=00000010 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000000 CCD=00000001 CCO=EFLAGS  
EFER=0000000000000000
check_exception old: 0xffffffff new 0x0
     0: v=00 e=0000 i=0 cpl=0 IP=0010:c01016d2 pc=c01016d2 SP=0018:c010d870 env->regs[R_EAX]=00000000
EAX=00000000 EBX=00010000 ECX=00008e00 EDX=0000c010
ESI=0010e000 EDI=00108438 EBP=c010d878 ESP=c010d870
EIP=c01016d2 EFL=00000246 [---Z-P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0018 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
CS =0010 00000000 ffffffff 00cf9a00 DPL=0 CS32 [-R-]
SS =0018 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
DS =0018 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
FS =0018 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
GS =0018 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy
GDT=     000010b0 00000020
IDT=     c0109080 000007ff
CR0=80010011 CR2=00000000 CR3=00107000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000020 CCD=00000000 CCO=CLR     
EFER=0000000000000000
check_exception old: 0x0 new 0xd
     1: v=08 e=0000 i=0 cpl=0 IP=0010:c01016d2 pc=c01016d2 SP=0018:c010d870 env->regs[R_EAX]=00000000
EAX=00000000 EBX=00010000 ECX=00008e00 EDX=0000c010
ESI=0010e000 EDI=00108438 EBP=c010d878 ESP=c010d870
EIP=c01016d2 EFL=00000246 [---Z-P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0018 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
CS =0010 00000000 ffffffff 00cf9a00 DPL=0 CS32 [-R-]
SS =0018 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
DS =0018 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
FS =0018 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
GS =0018 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy
GDT=     000010b0 00000020
IDT=     c0109080 000007ff
CR0=80010011 CR2=00000000 CR3=00107000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000020 CCD=00000000 CCO=CLR     
EFER=0000000000000000
check_exception old: 0x8 new 0xd
Checking the Qemu debug and the disassembly, the fault did happen because of the div instruction, here in the disassembly:

Code: Select all

c01016c0 <kernel_main>:
c01016c0:	55                  	 	push   %ebp
c01016c1:	89 e5                		mov    %esp,%ebp
c01016c3:	83 ec 08             		sub    $0x8,%esp
c01016c6:	e8 b5 fa ff ff       	call   c0101180 <terminal_initialize>
c01016cb:	e8 70 ff ff ff       	call   c0101640 <idt_init>
c01016d0:	31 c0                	xor    %eax,%eax
c01016d2:	f7 f0               ==>	div    %eax
c01016d4:	c9                   		leave  
c01016d5:	c3                   		ret    
c01016d6:	66 90                	xchg   %ax,%ax
c01016d8:	66 90                	xchg   %ax,%ax
c01016da:	66 90                	xchg   %ax,%ax
c01016dc:	66 90                	xchg   %ax,%ax
c01016de:	66 90                	xchg   %ax,%ax
Why aren't the ISRs taking over?

EDIT: Here is my linker.ld, if it helps:

Code: Select all

ENTRY (_start)

SECTIONS
{
	. = 0x00100000;

	_kernel_start = .;
	.multiboot.data : {
		*(.multiboot.data)
	}

	.multiboot.text : {
		*(.multiboot.text)
	}

	. += 0xC0000000;

	.text ALIGN (4K) : AT (ADDR (.text) - 0xC0000000)
	{
		*(.text)
	}
	.rodata ALIGN (4K) : AT (ADDR (.rodata) - 0xC0000000)
	{
		*(.rodata)
	}
	.data ALIGN (4K) : AT (ADDR (.data) - 0xC0000000)
	{
		*(.data)
	}
	.bss ALIGN (4K) : AT (ADDR (.bss) - 0xC0000000)
	{
		*(COMMON)
		*(.bss)
		*(.bootstrap_stack)
	}

	_kernel_end = .;
}
Last edited by warriorjacq9 on Wed Aug 07, 2024 2:39 pm, edited 5 times in total.
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Octocontrabass
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Posts: 5418
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Re: Interrupt handlers not working

Post by Octocontrabass »

warriorjacq9 wrote: ↑Tue Aug 06, 2024 1:35 pm

Code: Select all

    idt[vector].kernel_cs      = 0x00; // this value can be whatever offset your kernel code selector is in your GDT
Where is your kernel code selector in your GDT?
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warriorjacq9
Posts: 4
Joined: Tue Aug 06, 2024 1:25 pm
Libera.chat IRC: warriorjacq9

Re: Interrupt handlers not working

Post by warriorjacq9 »

I currently do not have a GDT. I was trying to get interrupts working before implementing one. My kernel is at 0xC0100000 if that helps
Last edited by warriorjacq9 on Wed Aug 07, 2024 10:39 am, edited 1 time in total.
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nullplan
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Posts: 1733
Joined: Wed Aug 30, 2017 8:24 am

Re: Interrupt handlers not working

Post by nullplan »

warriorjacq9 wrote: ↑Wed Aug 07, 2024 10:32 am I currently do not have a GDT. I was trying to get interrupts working before implementing one
Since interrupt gate descriptors must contain a reference to the GDT, you need a GDT before getting interrupts working.
Carpe diem!
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iansjack
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Posts: 4662
Joined: Sat Mar 31, 2012 3:07 am
Location: Chichester, UK

Re: Interrupt handlers not working

Post by iansjack »

You don't say how you are booting your kernel. If you are using a boot loader such as grub then you do have a GDT (and from the qemu dump it certainly looks that way). But you can't specify a CS value of 0.

Have you looked at the Intel Programmer's Manuals? You'll learn a lot more from them than blindly following a (probably buggy) online tutorial.
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warriorjacq9
Posts: 4
Joined: Tue Aug 06, 2024 1:25 pm
Libera.chat IRC: warriorjacq9

Re: Interrupt handlers not working

Post by warriorjacq9 »

Thanks! The reason I hadn't put in a GDT was because it would triple fault, but I found out why. I was using Bran's Kernel tutorial from osdever.net and forgot to switch the order of the MOV arguments when going from NASM to GAS :oops: . I also looked at my link.ld and put the code selector to 0xC0 where it should be. However, the handlers still aren't calling and the computer still triple faults.
Updated idt.c

Code: Select all

#include <kernel/idt.h>
#include <stdio.h>
#include <string.h>

__attribute__((aligned(0x10))) 
static idt_entry_t idt[256];
static idtr_t idtr;

unsigned char *exceptions[] = 
{
    "Division by Zero",
    "Debug",
    "Non Maskable Interrupt",
    "Breakpoint",
    "Into Detected Overflow",
    "Out of Bounds",
    "Invalid Opcode",
    "No Coprocessor",
    "Double Fault",
    "Coprocessor Segment Overrun",
    "Bad TSS",
    "Segment Not Present",
    "Stack Fault",
    "General Protection Fault",
    "Page Fault",
    "Unknown Interrupt",
    "Coprocessor Fault",
    "Alignment Check",
    "Machine Check",
    "Reserved",
    "Reserved",
    "Reserved",
    "Reserved",
    "Reserved",
    "Reserved",
    "Reserved",
    "Reserved",
    "Reserved",
    "Reserved",
    "Reserved",
    "Reserved",
    "Reserved",
};

void exception_handler(registers_t *r)
{
    if (r->err_code < 32)
    {
        printf("%s exception. System halted", exceptions[r->err_code]);
        for(;;);
    }
}

void idt_set_descriptor(uint8_t vector, void* isr, uint8_t flags)
{
    idt[vector].isr_low        = (uint32_t)isr & 0xFFFF;
    idt[vector].kernel_cs      = 0xC0; // this value can be whatever offset your kernel code selector is in your GDT
    idt[vector].attributes     = flags;
    idt[vector].isr_high       = (uint32_t)isr >> 16;
    idt[vector].reserved       = 0;
}

static bool vectors[IDT_MAX_DESCRIPTORS];

extern void* isr_stub_table[];

void idt_init()
{
    idtr.base = (uintptr_t)&idt[0];
    idtr.limit = (uint16_t)sizeof(idt_entry_t) * IDT_MAX_DESCRIPTORS - 1;

    memset(&idt, 0, sizeof(idt_entry_t) * 256);

    for (uint8_t vector = 0; vector < 32; vector++) {
        idt_set_descriptor(vector, isr_stub_table[vector], 0x8E);
        vectors[vector] = true;
    }

    __asm__ volatile ("lidt %0" : : "m"(idtr)); // load the new IDT
    __asm__ volatile ("sti"); // set the interrupt flag
}
Kernel main function:

Code: Select all

void kernel_main(void) {
	terminal_initialize();

	gdt_init();
	idt_init();

	//printf("Hello, kernel World!");
	__asm__ volatile("div %0" :: "r"(0));
}
Qemu log:

Code: Select all

SMM: enter
EAX=00000001 EBX=00000000 ECX=02000000 EDX=02000628
ESI=0000000b EDI=02000000 EBP=000f2c72 ESP=00006d98
EIP=000ebaef EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0010 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
CS =0008 00000000 ffffffff 00cf9b00 DPL=0 CS32 [-RA]
SS =0010 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
DS =0010 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
FS =0010 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
GS =0010 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy
GDT=     000f6280 00000037
IDT=     000f62be 00000000
CR0=00000011 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000080 CCD=00000001 CCO=LOGICB  
EFER=0000000000000000
SMM: after RSM
EAX=00000001 EBX=00000000 ECX=02000000 EDX=02000628
ESI=0000000b EDI=02000000 EBP=000f2c72 ESP=00006d98
EIP=000ebaef EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
CS =0008 00000000 ffffffff 00c09b00 DPL=0 CS32 [-RA]
SS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
FS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
GS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy
GDT=     000f6280 00000037
IDT=     000f62be 00000000
CR0=00000011 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000000 CCD=00000000 CCO=EFLAGS  
EFER=0000000000000000
SMM: enter
EAX=000000b5 EBX=000f7bfc ECX=00001234 EDX=00006dff
ESI=00006d3c EDI=07fbedc5 EBP=00006cfc ESP=00006cfc
EIP=00007bfb EFL=00000006 [-----P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =db80 000db800 ffffffff 008f9300
CS =f000 000f0000 ffffffff 008f9b00
SS =0000 00000000 ffffffff 008f9300
DS =0000 00000000 ffffffff 008f9300
FS =0000 00000000 ffffffff 008f9300
GS =0000 00000000 ffffffff 008f9300
LDT=0000 00000000 0000ffff 00008200
TR =0000 00000000 0000ffff 00008b00
GDT=     00000000 00000000
IDT=     00000000 000003ff
CR0=00000010 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000004 CCD=00006cfc CCO=EFLAGS  
EFER=0000000000000000
SMM: after RSM
EAX=000000b5 EBX=000f7bfc ECX=00001234 EDX=00006dff
ESI=00006d3c EDI=07fbedc5 EBP=00006cfc ESP=00006cfc
EIP=000f7bfc EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
CS =0008 00000000 ffffffff 00c09b00 DPL=0 CS32 [-RA]
SS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
FS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
GS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy
GDT=     000f6280 00000037
IDT=     000f62be 00000000
CR0=00000011 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000000 CCD=00000000 CCO=EFLAGS  
EFER=0000000000000000
SMM: enter
EAX=000000b5 EBX=00007c16 ECX=00005678 EDX=07fabb00
ESI=000ea600 EDI=07fbedc5 EBP=00006cfc ESP=00006cfc
EIP=000f7c15 EFL=00000016 [----AP-] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
CS =0008 00000000 ffffffff 00c09b00 DPL=0 CS32 [-RA]
SS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
FS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
GS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy
GDT=     000f6280 00000037
IDT=     000f62be 00000000
CR0=00000011 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000014 CCD=00006ce8 CCO=EFLAGS  
EFER=0000000000000000
SMM: after RSM
EAX=000000b5 EBX=00007c16 ECX=00005678 EDX=07fabb00
ESI=000ea600 EDI=07fbedc5 EBP=00006cfc ESP=00006cfc
EIP=00007c16 EFL=00000006 [-----P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =db80 000db800 ffffffff 00809300
CS =f000 000f0000 ffffffff 00809b00
SS =0000 00000000 ffffffff 00809300
DS =0000 00000000 ffffffff 00809300
FS =0000 00000000 ffffffff 00809300
GS =0000 00000000 ffffffff 00809300
LDT=0000 00000000 0000ffff 00008200
TR =0000 00000000 0000ffff 00008b00
GDT=     00000000 00000000
IDT=     00000000 000003ff
CR0=00000010 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000004 CCD=00000001 CCO=EFLAGS  
EFER=0000000000000000
SMM: enter
EAX=000000b5 EBX=000f7bfc ECX=00001234 EDX=00006aff
ESI=00006a22 EDI=07fbedc5 EBP=000069e2 ESP=000069e2
EIP=00007bfb EFL=00000006 [-----P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =db80 000db800 ffffffff 008f9300
CS =f000 000f0000 ffffffff 008f9b00
SS =0000 00000000 ffffffff 008f9300
DS =0000 00000000 ffffffff 008f9300
FS =0000 00000000 ffffffff 008f9300
GS =ca00 000ca000 ffffffff 008f9300
LDT=0000 00000000 0000ffff 00008200
TR =0000 00000000 0000ffff 00008b00
GDT=     00000000 00000000
IDT=     00000000 000003ff
CR0=00000010 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000004 CCD=000069e2 CCO=EFLAGS  
EFER=0000000000000000
SMM: after RSM
EAX=000000b5 EBX=000f7bfc ECX=00001234 EDX=00006aff
ESI=00006a22 EDI=07fbedc5 EBP=000069e2 ESP=000069e2
EIP=000f7bfc EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
CS =0008 00000000 ffffffff 00c09b00 DPL=0 CS32 [-RA]
SS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
FS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
GS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy
GDT=     000f6280 00000037
IDT=     000f62be 00000000
CR0=00000011 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000000 CCD=00000000 CCO=EFLAGS  
EFER=0000000000000000
SMM: enter
EAX=000000b5 EBX=00007c16 ECX=00005678 EDX=00000005
ESI=00000000 EDI=07fbedc5 EBP=000069e2 ESP=000069e2
EIP=000f7c15 EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
CS =0008 00000000 ffffffff 00c09b00 DPL=0 CS32 [-RA]
SS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
FS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
GS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy
GDT=     000f6280 00000037
IDT=     000f62be 00000000
CR0=00000011 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000000 CCD=000069ce CCO=EFLAGS  
EFER=0000000000000000
SMM: after RSM
EAX=000000b5 EBX=00007c16 ECX=00005678 EDX=00000005
ESI=00000000 EDI=07fbedc5 EBP=000069e2 ESP=000069e2
EIP=00007c16 EFL=00000006 [-----P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =db80 000db800 ffffffff 00809300
CS =f000 000f0000 ffffffff 00809b00
SS =0000 00000000 ffffffff 00809300
DS =0000 00000000 ffffffff 00809300
FS =0000 00000000 ffffffff 00809300
GS =ca00 000ca000 ffffffff 00809300
LDT=0000 00000000 0000ffff 00008200
TR =0000 00000000 0000ffff 00008b00
GDT=     00000000 00000000
IDT=     00000000 000003ff
CR0=00000010 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000004 CCD=00000001 CCO=EFLAGS  
EFER=0000000000000000
SMM: enter
EAX=000000b5 EBX=000f7bfc ECX=00001234 EDX=00006aff
ESI=00006a1c EDI=07fbedc5 EBP=000069dc ESP=000069dc
EIP=00007bfb EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =db80 000db800 ffffffff 00809300
CS =f000 000f0000 ffffffff 00809b00
SS =0000 00000000 ffffffff 00809300
DS =0000 00000000 ffffffff 00809300
FS =0000 00000000 ffffffff 00809300
GS =ca00 000ca000 ffffffff 00809300
LDT=0000 00000000 0000ffff 00008200
TR =0000 00000000 0000ffff 00008b00
GDT=     00000000 00000000
IDT=     00000000 000003ff
CR0=00000010 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000000 CCD=000069dc CCO=EFLAGS  
EFER=0000000000000000
SMM: after RSM
EAX=000000b5 EBX=000f7bfc ECX=00001234 EDX=00006aff
ESI=00006a1c EDI=07fbedc5 EBP=000069dc ESP=000069dc
EIP=000f7bfc EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
CS =0008 00000000 ffffffff 00c09b00 DPL=0 CS32 [-RA]
SS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
FS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
GS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy
GDT=     000f6280 00000037
IDT=     000f62be 00000000
CR0=00000011 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000000 CCD=00000000 CCO=EFLAGS  
EFER=0000000000000000
SMM: enter
EAX=000000b5 EBX=00007c16 ECX=00005678 EDX=00000003
ESI=07f8cb00 EDI=07fbedc5 EBP=000069dc ESP=000069dc
EIP=000f7c16 EFL=00000012 [----A--] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
CS =0008 00000000 ffffffff 00c09b00 DPL=0 CS32 [-RA]
SS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
FS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
GS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy
GDT=     000f6280 00000037
IDT=     000f62be 00000000
CR0=00000011 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000010 CCD=000069c8 CCO=EFLAGS  
EFER=0000000000000000
SMM: after RSM
EAX=000000b5 EBX=00007c16 ECX=00005678 EDX=00000003
ESI=07f8cb00 EDI=07fbedc5 EBP=000069dc ESP=000069dc
EIP=00007c16 EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =db80 000db800 ffffffff 00809300
CS =f000 000f0000 ffffffff 00809b00
SS =0000 00000000 ffffffff 00809300
DS =0000 00000000 ffffffff 00809300
FS =0000 00000000 ffffffff 00809300
GS =ca00 000ca000 ffffffff 00809300
LDT=0000 00000000 0000ffff 00008200
TR =0000 00000000 0000ffff 00008b00
GDT=     00000000 00000000
IDT=     00000000 000003ff
CR0=00000010 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000000 CCD=00000001 CCO=EFLAGS  
EFER=0000000000000000
SMM: enter
EAX=000000b5 EBX=000f7bfc ECX=00001234 EDX=00006aff
ESI=00006a22 EDI=07fbedc5 EBP=000069e2 ESP=000069e2
EIP=00007bfb EFL=00000006 [-----P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =db80 000db800 ffffffff 00809300
CS =f000 000f0000 ffffffff 00809b00
SS =0000 00000000 ffffffff 00809300
DS =0000 00000000 ffffffff 00809300
FS =0000 00000000 ffffffff 00809300
GS =ca00 000ca000 ffffffff 00809300
LDT=0000 00000000 0000ffff 00008200
TR =0000 00000000 0000ffff 00008b00
GDT=     00000000 00000000
IDT=     00000000 000003ff
CR0=00000010 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000004 CCD=000069e2 CCO=EFLAGS  
EFER=0000000000000000
SMM: after RSM
EAX=000000b5 EBX=000f7bfc ECX=00001234 EDX=00006aff
ESI=00006a22 EDI=07fbedc5 EBP=000069e2 ESP=000069e2
EIP=000f7bfc EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
CS =0008 00000000 ffffffff 00c09b00 DPL=0 CS32 [-RA]
SS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
FS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
GS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy
GDT=     000f6280 00000037
IDT=     000f62be 00000000
CR0=00000011 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000000 CCD=00000000 CCO=EFLAGS  
EFER=0000000000000000
SMM: enter
EAX=000000b5 EBX=00007c16 ECX=00005678 EDX=00000005
ESI=00000000 EDI=07fbedc5 EBP=000069e2 ESP=000069e2
EIP=000f7c15 EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
CS =0008 00000000 ffffffff 00c09b00 DPL=0 CS32 [-RA]
SS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
FS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
GS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy
GDT=     000f6280 00000037
IDT=     000f62be 00000000
CR0=00000011 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000000 CCD=000069ce CCO=EFLAGS  
EFER=0000000000000000
SMM: after RSM
EAX=000000b5 EBX=00007c16 ECX=00005678 EDX=00000005
ESI=00000000 EDI=07fbedc5 EBP=000069e2 ESP=000069e2
EIP=00007c16 EFL=00000006 [-----P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =db80 000db800 ffffffff 00809300
CS =f000 000f0000 ffffffff 00809b00
SS =0000 00000000 ffffffff 00809300
DS =0000 00000000 ffffffff 00809300
FS =0000 00000000 ffffffff 00809300
GS =ca00 000ca000 ffffffff 00809300
LDT=0000 00000000 0000ffff 00008200
TR =0000 00000000 0000ffff 00008b00
GDT=     00000000 00000000
IDT=     00000000 000003ff
CR0=00000010 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000004 CCD=00000001 CCO=EFLAGS  
EFER=0000000000000000
SMM: enter
EAX=000000b5 EBX=000f7bfc ECX=00001234 EDX=00006aff
ESI=00006a1c EDI=07fbedc5 EBP=000069dc ESP=000069dc
EIP=00007bfb EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =db80 000db800 ffffffff 00809300
CS =f000 000f0000 ffffffff 00809b00
SS =0000 00000000 ffffffff 00809300
DS =0000 00000000 ffffffff 00809300
FS =0000 00000000 ffffffff 00809300
GS =ca00 000ca000 ffffffff 00809300
LDT=0000 00000000 0000ffff 00008200
TR =0000 00000000 0000ffff 00008b00
GDT=     00000000 00000000
IDT=     00000000 000003ff
CR0=00000010 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000000 CCD=000069dc CCO=EFLAGS  
EFER=0000000000000000
SMM: after RSM
EAX=000000b5 EBX=000f7bfc ECX=00001234 EDX=00006aff
ESI=00006a1c EDI=07fbedc5 EBP=000069dc ESP=000069dc
EIP=000f7bfc EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
CS =0008 00000000 ffffffff 00c09b00 DPL=0 CS32 [-RA]
SS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
FS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
GS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy
GDT=     000f6280 00000037
IDT=     000f62be 00000000
CR0=00000011 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000000 CCD=00000000 CCO=EFLAGS  
EFER=0000000000000000
SMM: enter
EAX=000000b5 EBX=00007c16 ECX=00005678 EDX=00000003
ESI=07eccb00 EDI=07fbedc5 EBP=000069dc ESP=000069dc
EIP=000f7c15 EFL=00000012 [----A--] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
CS =0008 00000000 ffffffff 00c09b00 DPL=0 CS32 [-RA]
SS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
FS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
GS =0010 00000000 ffffffff 00c09300 DPL=0 DS   [-WA]
LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy
GDT=     000f6280 00000037
IDT=     000f62be 00000000
CR0=00000011 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000010 CCD=000069c8 CCO=EFLAGS  
EFER=0000000000000000
SMM: after RSM
EAX=000000b5 EBX=00007c16 ECX=00005678 EDX=00000003
ESI=07eccb00 EDI=07fbedc5 EBP=000069dc ESP=000069dc
EIP=00007c16 EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =db80 000db800 ffffffff 00809300
CS =f000 000f0000 ffffffff 00809b00
SS =0000 00000000 ffffffff 00809300
DS =0000 00000000 ffffffff 00809300
FS =0000 00000000 ffffffff 00809300
GS =ca00 000ca000 ffffffff 00809300
LDT=0000 00000000 0000ffff 00008200
TR =0000 00000000 0000ffff 00008b00
GDT=     00000000 00000000
IDT=     00000000 000003ff
CR0=00000010 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000000 CCD=00000001 CCO=EFLAGS  
EFER=0000000000000000
check_exception old: 0xffffffff new 0x0
     0: v=00 e=0000 i=0 cpl=0 IP=0010:c01016d7 pc=c01016d7 SP=0010:c010d870 env->regs[R_EAX]=00000000
EAX=00000000 EBX=00010000 ECX=00008e00 EDX=0000c010
ESI=0010e000 EDI=00108438 EBP=c010d878 ESP=c010d870
EIP=c01016d7 EFL=00000246 [---Z-P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0010 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
CS =0010 00000000 ffffffff 00cf9a00 DPL=0 CS32 [-R-]
SS =0010 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
DS =0010 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
FS =0010 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
GS =0010 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy
GDT=     c0109040 0000002f
IDT=     c0109080 000007ff
CR0=80010011 CR2=00000000 CR3=00107000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000020 CCD=00000000 CCO=CLR     
EFER=0000000000000000
check_exception old: 0x0 new 0xd
     1: v=08 e=0000 i=0 cpl=0 IP=0010:c01016d7 pc=c01016d7 SP=0010:c010d870 env->regs[R_EAX]=00000000
EAX=00000000 EBX=00010000 ECX=00008e00 EDX=0000c010
ESI=0010e000 EDI=00108438 EBP=c010d878 ESP=c010d870
EIP=c01016d7 EFL=00000246 [---Z-P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0010 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
CS =0010 00000000 ffffffff 00cf9a00 DPL=0 CS32 [-R-]
SS =0010 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
DS =0010 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
FS =0010 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
GS =0010 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy
GDT=     c0109040 0000002f
IDT=     c0109080 000007ff
CR0=80010011 CR2=00000000 CR3=00107000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00000020 CCD=00000000 CCO=CLR     
EFER=0000000000000000
check_exception old: 0x8 new 0xd
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iansjack
Member
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Posts: 4662
Joined: Sat Mar 31, 2012 3:07 am
Location: Chichester, UK

Re: Interrupt handlers not working

Post by iansjack »

Why 0xC0? That sounds like a very unlikely value for the code selector.

0x08 looks more reasonable. But you should understand why.

It would be a lot more sensible to create your own GDT, and understand what you are doing, and why, before worrying about interrupts and exceptions. (But that should come next.)
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warriorjacq9
Posts: 4
Joined: Tue Aug 06, 2024 1:25 pm
Libera.chat IRC: warriorjacq9

Re: Interrupt handlers not working

Post by warriorjacq9 »

Thanks for the suggestion! I went and looked at the Intel manuals along with other projects, and was able to fix my problem. Thanks for all the help
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Octocontrabass
Member
Member
Posts: 5418
Joined: Mon Mar 25, 2013 7:01 pm

Re: Interrupt handlers not working

Post by Octocontrabass »

iansjack wrote: ↑Wed Aug 07, 2024 11:06 amIf you are using a boot loader such as grub then you do have a GDT
You might have a GDT, but the Multiboot specification says you're not allowed to use it, so you still need to set up your own.
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