a75c54f933
On Thu, 2007-03-29 at 13:16 +0200, Andi Kleen wrote: > Please clean it up properly with two structs. Not sure about this, now I've done it. Running it here. If you like it, I can do x86-64 as well. == lguest defines its own TSS struct because the "struct tss_struct" contains linux-specific additions. Andi asked me to split the struct in processor.h. Unfortunately it makes usage a little awkward. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Andi Kleen <ak@suse.de>
70 lines
1.6 KiB
C
70 lines
1.6 KiB
C
#include <linux/mm.h>
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#include <linux/sched.h>
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#include <linux/init.h>
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#include <linux/init_task.h>
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#include <linux/fs.h>
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#include <asm/uaccess.h>
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#include <asm/pgtable.h>
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#include <asm/processor.h>
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#include <asm/desc.h>
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#define DOUBLEFAULT_STACKSIZE (1024)
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static unsigned long doublefault_stack[DOUBLEFAULT_STACKSIZE];
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#define STACK_START (unsigned long)(doublefault_stack+DOUBLEFAULT_STACKSIZE)
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#define ptr_ok(x) ((x) > PAGE_OFFSET && (x) < PAGE_OFFSET + 0x1000000)
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static void doublefault_fn(void)
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{
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struct Xgt_desc_struct gdt_desc = {0, 0};
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unsigned long gdt, tss;
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store_gdt(&gdt_desc);
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gdt = gdt_desc.address;
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printk("double fault, gdt at %08lx [%d bytes]\n", gdt, gdt_desc.size);
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if (ptr_ok(gdt)) {
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gdt += GDT_ENTRY_TSS << 3;
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tss = *(u16 *)(gdt+2);
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tss += *(u8 *)(gdt+4) << 16;
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tss += *(u8 *)(gdt+7) << 24;
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printk("double fault, tss at %08lx\n", tss);
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if (ptr_ok(tss)) {
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struct i386_hw_tss *t = (struct i386_hw_tss *)tss;
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printk("eip = %08lx, esp = %08lx\n", t->eip, t->esp);
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printk("eax = %08lx, ebx = %08lx, ecx = %08lx, edx = %08lx\n",
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t->eax, t->ebx, t->ecx, t->edx);
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printk("esi = %08lx, edi = %08lx\n",
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t->esi, t->edi);
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}
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}
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for (;;)
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cpu_relax();
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}
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struct tss_struct doublefault_tss __cacheline_aligned = {
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.x86_tss = {
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.esp0 = STACK_START,
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.ss0 = __KERNEL_DS,
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.ldt = 0,
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.io_bitmap_base = INVALID_IO_BITMAP_OFFSET,
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.eip = (unsigned long) doublefault_fn,
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/* 0x2 bit is always set */
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.eflags = X86_EFLAGS_SF | 0x2,
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.esp = STACK_START,
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.es = __USER_DS,
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.cs = __KERNEL_CS,
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.ss = __KERNEL_DS,
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.ds = __USER_DS,
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.__cr3 = __pa(swapper_pg_dir)
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}
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};
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