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x86-64, asm: Directly access per-cpu IST

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

Signed-off-by: Brian Gerst <brgerst@gmail.com>
LKML-Reference: <1280594903-6341-1-git-send-email-brgerst@gmail.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Brian Gerst 2010-07-31 12:48:22 -04:00 committed by H. Peter Anvin
parent a378d9338e
commit c15a5958a0
1 changed files with 3 additions and 3 deletions
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6
arch/x86/kernel/entry_64.S
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@ -1065,6 +1065,7 @@ ENTRY(\sym)
END(\sym)
.endm
#define INIT_TSS_IST(x) PER_CPU_VAR(init_tss) + (TSS_ist + ((x) - 1) * 8)
.macro paranoidzeroentry_ist sym do_sym ist
ENTRY(\sym)
INTR_FRAME
@ -1076,10 +1077,9 @@ ENTRY(\sym)
TRACE_IRQS_OFF
movq %rsp,%rdi /* pt_regs pointer */
xorl %esi,%esi /* no error code */
PER_CPU(init_tss, %r12)
subq $EXCEPTION_STKSZ, TSS_ist + (\ist - 1) * 8(%r12)
subq $EXCEPTION_STKSZ, INIT_TSS_IST(\ist)
call \do_sym
addq $EXCEPTION_STKSZ, TSS_ist + (\ist - 1) * 8(%r12)
addq $EXCEPTION_STKSZ, INIT_TSS_IST(\ist)
jmp paranoid_exit /* %ebx: no swapgs flag */
CFI_ENDPROC
END(\sym)