Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Chuck Ebbert | 3dab307 | 2007-08-10 22:31:11 +0200 | [diff] [blame] | 16 | #define ptr_ok(x) ((x) > PAGE_OFFSET && (x) < PAGE_OFFSET + MAXMEM) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | |
| 18 | static void doublefault_fn(void) |
| 19 | { |
Glauber de Oliveira Costa | 6b68f01 | 2008-01-30 13:31:12 +0100 | [diff] [blame] | 20 | struct desc_ptr gdt_desc = {0, 0}; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | unsigned long gdt, tss; |
| 22 | |
Zachary Amsden | 4d37e7e | 2005-09-03 15:56:38 -0700 | [diff] [blame] | 23 | store_gdt(&gdt_desc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | gdt = gdt_desc.address; |
| 25 | |
Chuck Ebbert | 3dab307 | 2007-08-10 22:31:11 +0200 | [diff] [blame] | 26 | printk(KERN_EMERG "PANIC: double fault, gdt at %08lx [%d bytes]\n", gdt, gdt_desc.size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
| 28 | if (ptr_ok(gdt)) { |
| 29 | gdt += GDT_ENTRY_TSS << 3; |
| 30 | tss = *(u16 *)(gdt+2); |
| 31 | tss += *(u8 *)(gdt+4) << 16; |
| 32 | tss += *(u8 *)(gdt+7) << 24; |
Chuck Ebbert | 3dab307 | 2007-08-10 22:31:11 +0200 | [diff] [blame] | 33 | printk(KERN_EMERG "double fault, tss at %08lx\n", tss); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | |
| 35 | if (ptr_ok(tss)) { |
Glauber de Oliveira Costa | ca241c7 | 2008-01-30 13:31:31 +0100 | [diff] [blame] | 36 | struct x86_hw_tss *t = (struct x86_hw_tss *)tss; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
H. Peter Anvin | faca622 | 2008-01-30 13:31:02 +0100 | [diff] [blame] | 38 | printk(KERN_EMERG "eip = %08lx, esp = %08lx\n", |
| 39 | t->ip, t->sp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | |
Chuck Ebbert | 3dab307 | 2007-08-10 22:31:11 +0200 | [diff] [blame] | 41 | printk(KERN_EMERG "eax = %08lx, ebx = %08lx, ecx = %08lx, edx = %08lx\n", |
H. Peter Anvin | faca622 | 2008-01-30 13:31:02 +0100 | [diff] [blame] | 42 | t->ax, t->bx, t->cx, t->dx); |
Chuck Ebbert | 3dab307 | 2007-08-10 22:31:11 +0200 | [diff] [blame] | 43 | printk(KERN_EMERG "esi = %08lx, edi = %08lx\n", |
H. Peter Anvin | faca622 | 2008-01-30 13:31:02 +0100 | [diff] [blame] | 44 | t->si, t->di); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | } |
| 46 | } |
| 47 | |
Chuck Ebbert | caad3c2 | 2006-06-25 05:46:53 -0700 | [diff] [blame] | 48 | for (;;) |
| 49 | cpu_relax(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | } |
| 51 | |
| 52 | struct tss_struct doublefault_tss __cacheline_aligned = { |
Rusty Russell | a75c54f | 2007-05-02 19:27:13 +0200 | [diff] [blame] | 53 | .x86_tss = { |
H. Peter Anvin | faca622 | 2008-01-30 13:31:02 +0100 | [diff] [blame] | 54 | .sp0 = STACK_START, |
Rusty Russell | a75c54f | 2007-05-02 19:27:13 +0200 | [diff] [blame] | 55 | .ss0 = __KERNEL_DS, |
| 56 | .ldt = 0, |
| 57 | .io_bitmap_base = INVALID_IO_BITMAP_OFFSET, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | |
H. Peter Anvin | faca622 | 2008-01-30 13:31:02 +0100 | [diff] [blame] | 59 | .ip = (unsigned long) doublefault_fn, |
Rusty Russell | a75c54f | 2007-05-02 19:27:13 +0200 | [diff] [blame] | 60 | /* 0x2 bit is always set */ |
H. Peter Anvin | faca622 | 2008-01-30 13:31:02 +0100 | [diff] [blame] | 61 | .flags = X86_EFLAGS_SF | 0x2, |
| 62 | .sp = STACK_START, |
Rusty Russell | a75c54f | 2007-05-02 19:27:13 +0200 | [diff] [blame] | 63 | .es = __USER_DS, |
| 64 | .cs = __KERNEL_CS, |
| 65 | .ss = __KERNEL_DS, |
| 66 | .ds = __USER_DS, |
Chuck Ebbert | 3dab307 | 2007-08-10 22:31:11 +0200 | [diff] [blame] | 67 | .fs = __KERNEL_PERCPU, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | |
Vegard Nossum | af5c2bd | 2008-10-03 17:54:25 +0200 | [diff] [blame] | 69 | .__cr3 = __pa_nodebug(swapper_pg_dir), |
Rusty Russell | a75c54f | 2007-05-02 19:27:13 +0200 | [diff] [blame] | 70 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | }; |