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GP Fault handler

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xamidev
2026-01-10 11:04:08 +01:00
parent 12ab12f1b2
commit 9cbecc1689
2 changed files with 35 additions and 3 deletions
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29
src/idt/idt.c
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@@ -4,6 +4,7 @@
#include "io/serial/serial.h"
#include "io/kbd/ps2.h"
#include <kernel.h>
#include <stdbool.h>
struct interrupt_descriptor idt[256];
struct idtr idt_reg;
@@ -85,6 +86,32 @@ static void page_fault_handler(struct cpu_status_t* ctx)
panic(ctx);
}
static void gp_fault_handler(struct cpu_status_t* ctx)
{
DEBUG("\x1b[38;5;231mGeneral Protection Fault at rip=0x%p, err=%u (%s)\x1b[0m",
ctx->iret_rip,
ctx->error_code,
(ctx->error_code == 0) ? "NOT_SEGMENT_RELATED" : "SEGMENT_RELATED");
// Segment-related
if (ctx->error_code != 0)
{
bool is_external = CHECK_BIT(ctx->error_code, 0);
// is it IDT, GDT, LDT?
uint8_t table = ctx->error_code & 0x6; // 0b110 (isolate table)
uint16_t index = ctx->error_code & 0xFFF8; // 13*1 1111111111111 + 000 = 1111111111111000
char* table_names[4] = {"GDT", "IDT", "LDT", "IDT"};
DEBUG("\x1b[38;5;231m%s in %s index %u\x1b[0m",
is_external ? "EXTERNAL" : "INTERNAL",
table_names[table],
index);
}
panic(ctx);
}
struct cpu_status_t* interrupt_dispatch(struct cpu_status_t* context)
{
switch(context->vector_number)
@@ -129,7 +156,7 @@ struct cpu_status_t* interrupt_dispatch(struct cpu_status_t* context)
DEBUG("Stack-Segment Fault!");
break;
case 13:
DEBUG("General Protection Fault!");
gp_fault_handler(context);
break;
case 14:
// Better debugging for page faults...