![Akinobu Mita](/assets/img/avatar_default.png)
Use get_desc_base() to get the base address in desc_struct Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> LKML-Reference: <20090718150853.GA11294@localhost.localdomain> Signed-off-by: Ingo Molnar <mingo@elte.hu>
70 lines
1.7 KiB
C
70 lines
1.7 KiB
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 desc_ptr 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 = get_desc_base((struct desc_struct *)gdt);
|
|
printk(KERN_EMERG "double fault, tss at %08lx\n", tss);
|
|
|
|
if (ptr_ok(tss)) {
|
|
struct x86_hw_tss *t = (struct x86_hw_tss *)tss;
|
|
|
|
printk(KERN_EMERG "eip = %08lx, esp = %08lx\n",
|
|
t->ip, t->sp);
|
|
|
|
printk(KERN_EMERG "eax = %08lx, ebx = %08lx, ecx = %08lx, edx = %08lx\n",
|
|
t->ax, t->bx, t->cx, t->dx);
|
|
printk(KERN_EMERG "esi = %08lx, edi = %08lx\n",
|
|
t->si, t->di);
|
|
}
|
|
}
|
|
|
|
for (;;)
|
|
cpu_relax();
|
|
}
|
|
|
|
struct tss_struct doublefault_tss __cacheline_aligned = {
|
|
.x86_tss = {
|
|
.sp0 = STACK_START,
|
|
.ss0 = __KERNEL_DS,
|
|
.ldt = 0,
|
|
.io_bitmap_base = INVALID_IO_BITMAP_OFFSET,
|
|
|
|
.ip = (unsigned long) doublefault_fn,
|
|
/* 0x2 bit is always set */
|
|
.flags = X86_EFLAGS_SF | 0x2,
|
|
.sp = STACK_START,
|
|
.es = __USER_DS,
|
|
.cs = __KERNEL_CS,
|
|
.ss = __KERNEL_DS,
|
|
.ds = __USER_DS,
|
|
.fs = __KERNEL_PERCPU,
|
|
|
|
.__cr3 = __pa_nodebug(swapper_pg_dir),
|
|
}
|
|
};
|