提交 254e0a6b 编写于 作者: A Akinobu Mita 提交者: Ingo Molnar

x86: Use get_desc_base()

Use get_desc_base() to get the base address in desc_struct
Signed-off-by: NAkinobu Mita <akinobu.mita@gmail.com>
LKML-Reference: <20090718150853.GA11294@localhost.localdomain>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
上级 78af08d9
......@@ -27,9 +27,7 @@ static void doublefault_fn(void)
if (ptr_ok(gdt)) {
gdt += GDT_ENTRY_TSS << 3;
tss = *(u16 *)(gdt+2);
tss += *(u8 *)(gdt+4) << 16;
tss += *(u8 *)(gdt+7) << 24;
tss = get_desc_base((struct desc_struct *)gdt);
printk(KERN_EMERG "double fault, tss at %08lx\n", tss);
if (ptr_ok(tss)) {
......
......@@ -4,6 +4,7 @@
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/ptrace.h>
#include <asm/desc.h>
unsigned long convert_ip_to_linear(struct task_struct *child, struct pt_regs *regs)
{
......@@ -23,7 +24,7 @@ unsigned long convert_ip_to_linear(struct task_struct *child, struct pt_regs *re
* and APM bios ones we just ignore here.
*/
if ((seg & SEGMENT_TI_MASK) == SEGMENT_LDT) {
u32 *desc;
struct desc_struct *desc;
unsigned long base;
seg &= ~7UL;
......@@ -33,12 +34,10 @@ unsigned long convert_ip_to_linear(struct task_struct *child, struct pt_regs *re
addr = -1L; /* bogus selector, access would fault */
else {
desc = child->mm->context.ldt + seg;
base = ((desc[0] >> 16) |
((desc[1] & 0xff) << 16) |
(desc[1] & 0xff000000));
base = get_desc_base(desc);
/* 16-bit code segment? */
if (!((desc[1] >> 22) & 1))
if (!desc->d)
addr &= 0xffff;
addr += base;
}
......
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