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doublefault_32.c

#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 + MAXMEM)

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(KERN_EMERG "PANIC: 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(KERN_EMERG "double fault, tss at %08lx\n", tss);

            if (ptr_ok(tss)) {
                  struct i386_hw_tss *t = (struct i386_hw_tss *)tss;

                  printk(KERN_EMERG "eip = %08lx, esp = %08lx\n", t->eip, t->esp);

                  printk(KERN_EMERG "eax = %08lx, ebx = %08lx, ecx = %08lx, edx = %08lx\n",
                        t->eax, t->ebx, t->ecx, t->edx);
                  printk(KERN_EMERG "esi = %08lx, edi = %08lx\n",
                        t->esi, t->edi);
            }
      }

      for (;;)
            cpu_relax();
}

struct tss_struct doublefault_tss __cacheline_aligned = {
      .x86_tss = {
            .esp0       = STACK_START,
            .ss0        = __KERNEL_DS,
            .ldt        = 0,
            .io_bitmap_base   = INVALID_IO_BITMAP_OFFSET,

            .eip        = (unsigned long) doublefault_fn,
            /* 0x2 bit is always set */
            .eflags           = X86_EFLAGS_SF | 0x2,
            .esp        = STACK_START,
            .es         = __USER_DS,
            .cs         = __KERNEL_CS,
            .ss         = __KERNEL_DS,
            .ds         = __USER_DS,
            .fs         = __KERNEL_PERCPU,

            .__cr3            = __pa(swapper_pg_dir)
      }
};

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