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-rw-r--r--arch/x86/kernel/head_32.S20
1 files changed, 8 insertions, 12 deletions
diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S
index 1f85ee8f9439..0332664eb158 100644
--- a/arch/x86/kernel/head_32.S
+++ b/arch/x86/kernel/head_32.S
@@ -457,12 +457,9 @@ early_idt_handler_common:
/* The vector number is in pt_regs->gs */
cld
- pushl %fs /* pt_regs->fs */
- movw $0, 2(%esp) /* clear high bits (some CPUs leave garbage) */
- pushl %es /* pt_regs->es */
- movw $0, 2(%esp) /* clear high bits (some CPUs leave garbage) */
- pushl %ds /* pt_regs->ds */
- movw $0, 2(%esp) /* clear high bits (some CPUs leave garbage) */
+ pushl %fs /* pt_regs->fs (__fsh varies by model) */
+ pushl %es /* pt_regs->es (__esh varies by model) */
+ pushl %ds /* pt_regs->ds (__dsh varies by model) */
pushl %eax /* pt_regs->ax */
pushl %ebp /* pt_regs->bp */
pushl %edi /* pt_regs->di */
@@ -479,9 +476,8 @@ early_idt_handler_common:
/* Load the vector number into EDX */
movl PT_GS(%esp), %edx
- /* Load GS into pt_regs->gs and clear high bits */
+ /* Load GS into pt_regs->gs (and maybe clobber __gsh) */
movw %gs, PT_GS(%esp)
- movw $0, PT_GS+2(%esp)
movl %esp, %eax /* args are pt_regs (EAX), trapnr (EDX) */
call early_fixup_exception
@@ -493,10 +489,10 @@ early_idt_handler_common:
popl %edi /* pt_regs->di */
popl %ebp /* pt_regs->bp */
popl %eax /* pt_regs->ax */
- popl %ds /* pt_regs->ds */
- popl %es /* pt_regs->es */
- popl %fs /* pt_regs->fs */
- popl %gs /* pt_regs->gs */
+ popl %ds /* pt_regs->ds (always ignores __dsh) */
+ popl %es /* pt_regs->es (always ignores __esh) */
+ popl %fs /* pt_regs->fs (always ignores __fsh) */
+ popl %gs /* pt_regs->gs (always ignores __gsh) */
decl %ss:early_recursion_flag
addl $4, %esp /* pop pt_regs->orig_ax */
iret