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- #include <linux/mm.h>
- #include <linux/sched.h>
- #include <linux/init.h>
- #include <linux/init_task.h>
- #include <linux/fs.h>
- #include <asm/uaccess.h>
- #include <asm/pgtable.h>
- #include <asm/processor.h>
- #include <asm/desc.h>
- #define DOUBLEFAULT_STACKSIZE (1024)
- static unsigned long doublefault_stack[DOUBLEFAULT_STACKSIZE];
- #define STACK_START (unsigned long)(doublefault_stack+DOUBLEFAULT_STACKSIZE)
- #define ptr_ok(x) ((x) > PAGE_OFFSET && (x) < PAGE_OFFSET + 0x1000000)
- static void doublefault_fn(void)
- {
- struct Xgt_desc_struct gdt_desc = {0, 0};
- unsigned long gdt, tss;
- store_gdt(&gdt_desc);
- gdt = gdt_desc.address;
- printk("double fault, gdt at %08lx [%d bytes]\n", gdt, gdt_desc.size);
- if (ptr_ok(gdt)) {
- gdt += GDT_ENTRY_TSS << 3;
- tss = *(u16 *)(gdt+2);
- tss += *(u8 *)(gdt+4) << 16;
- tss += *(u8 *)(gdt+7) << 24;
- printk("double fault, tss at %08lx\n", tss);
- if (ptr_ok(tss)) {
- struct tss_struct *t = (struct tss_struct *)tss;
- printk("eip = %08lx, esp = %08lx\n", t->eip, t->esp);
- printk("eax = %08lx, ebx = %08lx, ecx = %08lx, edx = %08lx\n",
- t->eax, t->ebx, t->ecx, t->edx);
- printk("esi = %08lx, edi = %08lx\n",
- t->esi, t->edi);
- }
- }
- for (;;) /* nothing */;
- }
- struct tss_struct doublefault_tss __cacheline_aligned = {
- .esp0 = STACK_START,
- .ss0 = __KERNEL_DS,
- .ldt = 0,
- .io_bitmap_base = INVALID_IO_BITMAP_OFFSET,
- .eip = (unsigned long) doublefault_fn,
- .eflags = X86_EFLAGS_SF | 0x2, /* 0x2 bit is always set */
- .esp = STACK_START,
- .es = __USER_DS,
- .cs = __KERNEL_CS,
- .ss = __KERNEL_DS,
- .ds = __USER_DS,
- .__cr3 = __pa(swapper_pg_dir)
- };
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