x86-32, asm: Directly access per-cpu GDT

Use a direct per-cpu reference for the GDT instead of using a scratch
register.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
LKML-Reference: <1280594903-6341-2-git-send-email-brgerst@gmail.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

1 files changed, 5 insertions, 6 deletions

diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S
index cd49141cf153..233c5829e7ac 100644
--- a/arch/x86/kernel/entry_32.S
+++ b/arch/x86/kernel/entry_32.S
@@ -611,14 +611,14 @@ ldt_ss:
  * compensating for the offset by changing to the ESPFIX segment with
  * a base address that matches for the difference.
  */
+#define GDT_ESPFIX_SS PER_CPU_VAR(gdt_page) + (GDT_ENTRY_ESPFIX_SS * 8)
         mov %esp, %edx                  /* load kernel esp */
         mov PT_OLDESP(%esp), %eax       /* load userspace esp */
         mov %dx, %ax                    /* eax: new kernel esp */
         sub %eax, %edx                  /* offset (low word is 0) */
-        PER_CPU(gdt_page, %ebx)
         shr $16, %edx
-        mov %dl, GDT_ENTRY_ESPFIX_SS * 8 + 4(%ebx) /* bits 16..23 */
-        mov %dh, GDT_ENTRY_ESPFIX_SS * 8 + 7(%ebx) /* bits 24..31 */
+        mov %dl, GDT_ESPFIX_SS + 4 /* bits 16..23 */
+        mov %dh, GDT_ESPFIX_SS + 7 /* bits 24..31 */
         pushl $__ESPFIX_SS
         CFI_ADJUST_CFA_OFFSET 4
         push %eax                       /* new kernel esp */
@@ -791,9 +791,8 @@ ptregs_clone:
  * normal stack and adjusts ESP with the matching offset.
  */
         /* fixup the stack */
-        PER_CPU(gdt_page, %ebx)
-        mov GDT_ENTRY_ESPFIX_SS * 8 + 4(%ebx), %al /* bits 16..23 */
-        mov GDT_ENTRY_ESPFIX_SS * 8 + 7(%ebx), %ah /* bits 24..31 */
+        mov GDT_ESPFIX_SS + 4, %al /* bits 16..23 */
+        mov GDT_ESPFIX_SS + 7, %ah /* bits 24..31 */
         shl $16, %eax
         addl %esp, %eax                 /* the adjusted stack pointer */
         pushl $__KERNEL_DS