kernel - Asm volatile ("int $0x3") call restarts the machine -


i studying kernel development. test interrupt handler need run asm volatile ("idt $0x3") command. whenever command called in main.c, machine restarts. tried remove interrupt handler. nothing changed. should do?

gdt assembly:

[extern _start]  lgdt [gdt_descriptor] jmp code_seg:initgdt  initgdt: mov ax, data_seg      mov ds, ax        mov es, ax mov fs, ax mov gs, ax mov ss, ax mov ebp, 0x90000 mov esp, ebp call _start ;main.c function jmp $  gdt_star:  gdt_null: dd 0x0       dd 0x0        gdt_code: dw 0xffff    dw 0x0010 db 0x00      db 10011011b db 01001111b db 0x00   gdt_data: dw 0xffff dw 0x0020 db 0x00 db 10010010b db 01001111b db 0x0                 gdt_end:  gdt_descriptor: dw gdt_end - gdt_star - 1 dd gdt_star  code_seg equ gdt_code - gdt_star data_seg equ gdt_data - gdt_star

descriptor_tables.c:

extern void idt_flush(uint32_t); extern void isr0(); extern void isr1(); .... extern void isr31();   static void init_idt() {     idt_ptr.limit = sizeof(idt_entry_t) * 256 -1;     idt_ptr.base  = (uint32_t)&idt_entries;      memset((uint8_t*)&idt_entries, 0, sizeof(idt_entry_t)*256);      idt_set_gate(0, (uint32_t)isr0, 0x08, 0x8e);     idt_set_gate(1, (uint32_t)isr1, 0x08, 0x8e);     ....     idt_set_gate(31, (uint32_t)isr31, 0x08, 0x8e);      idt_flush((uint32_t)&idt_ptr); }  static void idt_set_gate(uint8_t num, uint32_t base, uint16_t sel, uint8_t flags) {    idt_entries[num].base_lo = base & 0xffff;    idt_entries[num].base_hi = (base >> 16) & 0xffff;     idt_entries[num].sel     = sel;    idt_entries[num].always0 = 0;    idt_entries[num].flags   = flags }

interrupt.asm:

%macro isr_noerrcode 1    [global _isr%1]          _isr%1:     cli     push byte 0     push byte %1     jmp isr_common_stub %endmacro  %macro isr_errcode 1   [global _isr%1]   _isr%1:     cli     push byte %1     jmp isr_common_stub %endmacro  isr_noerrcode 0 isr_noerrcode 1 .... isr_noerrcode 31  [extern _isr_handler]  isr_common_stub: pusha                      mov ax, ds                push eax                  mov ax, 0x10  mov ds, ax mov es, ax mov fs, ax mov gs, ax  call _isr_handler  pop eax         mov ds, ax mov es, ax mov fs, ax mov gs, ax  popa                     add esp, 8      sti iret

isr.c:

void isr_handler(registers_t regs) {    uint8_t str[12] = "\ninterrupt:";    str[11] = 0;    puts(str, false);    itoa(str, 10, regs.int_no);    puts(str, false);    str[0] = '\n';    str[1] = 0;    puts(str, true); }

kernel_entry.asm:

.... [global _idt_flush] _idt_flush:    mov eax, [esp+4]      lidt [eax]           ret

i converted descriptor_tables.c c code assembly code , used following macro:

%macro idt_entry 1 dw _isr%1 dw 0x08 db 0x0 db 0x8e dw 0x0000 %endmacro

now, works. not sure why did not accept c code. moreover, following macro did not work either:

%macro idt_entry 1 dw (_isr%1 - $$) & 0xffff dw 0x08 db 0x0 db 0x8e dw ((_isr%1 - $$) >> 16) & 0xffff %endmacro

again, not sure why second macro not working.


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