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Kernel: Add custom stack to double fault handler 

This prevents triple faults!
This commit is contained in:
Bananymous 2025-07-02 23:13:17 +03:00
parent 6084aae603
commit 8da4f80453
5 changed files with 20 additions and 11 deletions
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10
kernel/arch/i686/boot.S
View File

@ -59,10 +59,10 @@ bananboot_start:
bananboot_end:
.section .bss, "aw", @nobits
.align 4096
boot_stack_bottom:
.global g_boot_stack_top
g_boot_stack_bottom:
.skip 4096 * 4
boot_stack_top:
g_boot_stack_top:
.global g_kernel_cmdline
g_kernel_cmdline:
@ -194,7 +194,7 @@ _start:
movl %ebx, V2P(bootloader_info)
# load boot stack
movl $V2P(boot_stack_top), %esp
movl $V2P(g_boot_stack_top), %esp
# load boot GDT
lgdt V2P(boot_gdtr)
@ -212,7 +212,7 @@ gdt_flush:
call initialize_paging
# load higher half stack pointer
movl $boot_stack_top, %esp
movl $g_boot_stack_top, %esp
# jump to higher half
leal higher_half, %ecx

9
kernel/arch/x86_64/boot.S
View File

@ -59,9 +59,10 @@ bananboot_start:
bananboot_end:
.section .bss, "aw", @nobits
boot_stack_bottom:
.skip 4096 * 64
boot_stack_top:
.global g_boot_stack_top
g_boot_stack_bottom:
.skip 4096 * 4
g_boot_stack_top:
.global g_kernel_cmdline
g_kernel_cmdline:
@ -193,7 +194,7 @@ _start:
movl %eax, V2P(bootloader_magic)
movl %ebx, V2P(bootloader_info)
movl $V2P(boot_stack_top), %esp
movl $V2P(g_boot_stack_top), %esp
call check_requirements
call enable_sse

2
kernel/include/kernel/IDT.h
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@ -75,7 +75,7 @@ namespace Kernel
private:
IDT() = default;
void register_interrupt_handler(uint8_t index, void (*handler)());
void register_interrupt_handler(uint8_t index, void (*handler)(), uint8_t ist = 0);
void register_syscall_handler(uint8_t index, void (*handler)());
private:

4
kernel/kernel/GDT.cpp
View File

@ -1,8 +1,11 @@
#include <kernel/GDT.h>
#include <kernel/Memory/Types.h>
#include <kernel/Processor.h>
#include <string.h>
extern "C" uint8_t g_boot_stack_top[];
namespace Kernel
{
@ -62,6 +65,7 @@ namespace Kernel
{
memset(&m_tss, 0x00, sizeof(TaskStateSegment));
m_tss.iopb = sizeof(TaskStateSegment);
m_tss.ist1 = reinterpret_cast<vaddr_t>(g_boot_stack_top);
uintptr_t base = reinterpret_cast<uintptr_t>(&m_tss);

6
kernel/kernel/IDT.cpp
View File

@ -401,7 +401,7 @@ namespace Kernel
Thread::current().load_sse();
}
void IDT::register_interrupt_handler(uint8_t index, void (*handler)())
void IDT::register_interrupt_handler(uint8_t index, void (*handler)(), uint8_t ist)
{
auto& desc = m_idt[index];
memset(&desc, 0, sizeof(GateDescriptor));
@ -412,6 +412,7 @@ namespace Kernel
desc.offset2 = (uint32_t)((uintptr_t)handler >> 32);
#endif
desc.IST = ist;
desc.selector = 0x08;
desc.flags = 0x8E;
}
@ -453,6 +454,9 @@ namespace Kernel
ISR_LIST_X
#undef X
idt->register_interrupt_handler(DoubleFault, isr8, 1);
static_assert(DoubleFault == 8);
#define X(num) idt->register_interrupt_handler(IRQ_VECTOR_BASE + num, irq ## num);
IRQ_LIST_X
#undef X