Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | #include <linux/mm.h> |
2 | #include <linux/sched.h> | |
3 | #include <linux/init.h> | |
4 | #include <linux/init_task.h> | |
5 | #include <linux/fs.h> | |
6 | ||
7 | #include <asm/uaccess.h> | |
8 | #include <asm/pgtable.h> | |
9 | #include <asm/processor.h> | |
10 | #include <asm/desc.h> | |
11 | ||
12 | #define DOUBLEFAULT_STACKSIZE (1024) | |
13 | static unsigned long doublefault_stack[DOUBLEFAULT_STACKSIZE]; | |
14 | #define STACK_START (unsigned long)(doublefault_stack+DOUBLEFAULT_STACKSIZE) | |
15 | ||
3dab307e | 16 | #define ptr_ok(x) ((x) > PAGE_OFFSET && (x) < PAGE_OFFSET + MAXMEM) |
1da177e4 LT |
17 | |
18 | static void doublefault_fn(void) | |
19 | { | |
6b68f01b | 20 | struct desc_ptr gdt_desc = {0, 0}; |
1da177e4 LT |
21 | unsigned long gdt, tss; |
22 | ||
4d37e7e3 | 23 | store_gdt(&gdt_desc); |
1da177e4 LT |
24 | gdt = gdt_desc.address; |
25 | ||
3dab307e | 26 | printk(KERN_EMERG "PANIC: double fault, gdt at %08lx [%d bytes]\n", gdt, gdt_desc.size); |
1da177e4 LT |
27 | |
28 | if (ptr_ok(gdt)) { | |
29 | gdt += GDT_ENTRY_TSS << 3; | |
254e0a6b | 30 | tss = get_desc_base((struct desc_struct *)gdt); |
3dab307e | 31 | printk(KERN_EMERG "double fault, tss at %08lx\n", tss); |
1da177e4 LT |
32 | |
33 | if (ptr_ok(tss)) { | |
ca241c75 | 34 | struct x86_hw_tss *t = (struct x86_hw_tss *)tss; |
1da177e4 | 35 | |
faca6227 PA |
36 | printk(KERN_EMERG "eip = %08lx, esp = %08lx\n", |
37 | t->ip, t->sp); | |
1da177e4 | 38 | |
3dab307e | 39 | printk(KERN_EMERG "eax = %08lx, ebx = %08lx, ecx = %08lx, edx = %08lx\n", |
faca6227 | 40 | t->ax, t->bx, t->cx, t->dx); |
3dab307e | 41 | printk(KERN_EMERG "esi = %08lx, edi = %08lx\n", |
faca6227 | 42 | t->si, t->di); |
1da177e4 LT |
43 | } |
44 | } | |
45 | ||
caad3c2a CE |
46 | for (;;) |
47 | cpu_relax(); | |
1da177e4 LT |
48 | } |
49 | ||
50 | struct tss_struct doublefault_tss __cacheline_aligned = { | |
a75c54f9 | 51 | .x86_tss = { |
faca6227 | 52 | .sp0 = STACK_START, |
a75c54f9 RR |
53 | .ss0 = __KERNEL_DS, |
54 | .ldt = 0, | |
55 | .io_bitmap_base = INVALID_IO_BITMAP_OFFSET, | |
1da177e4 | 56 | |
faca6227 | 57 | .ip = (unsigned long) doublefault_fn, |
a75c54f9 | 58 | /* 0x2 bit is always set */ |
faca6227 PA |
59 | .flags = X86_EFLAGS_SF | 0x2, |
60 | .sp = STACK_START, | |
a75c54f9 RR |
61 | .es = __USER_DS, |
62 | .cs = __KERNEL_CS, | |
63 | .ss = __KERNEL_DS, | |
64 | .ds = __USER_DS, | |
3dab307e | 65 | .fs = __KERNEL_PERCPU, |
1da177e4 | 66 | |
af5c2bd1 | 67 | .__cr3 = __pa_nodebug(swapper_pg_dir), |
a75c54f9 | 68 | } |
1da177e4 | 69 | }; |