s390/nmi: Simplify ptregs setup
The low level machine check handler code fills the ptregs structure partially with the register contents present at machine check handler entry and partially with contents from the machine check save area. In case of a machine check the contents of all general purpose registers are saved by the CPU to the machine check save area. Therefore simplify the code and fill the ptregs structure by only using the machine check save area as source. Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Sven Schnelle <svens@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
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@ -491,8 +491,8 @@ SYM_CODE_START(mcck_int_handler)
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stctg %c1,%c1,__PT_CR1(%r11)
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lctlg %c1,%c1,__LC_KERNEL_ASCE
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xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
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lghi %r14,__LC_GPREGS_SAVE_AREA+64
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stmg %r0,%r7,__PT_R0(%r11)
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lghi %r14,__LC_GPREGS_SAVE_AREA
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mvc __PT_R0(128,%r11),0(%r14)
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# clear user controlled registers to prevent speculative use
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xgr %r0,%r0
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xgr %r1,%r1
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@ -502,7 +502,6 @@ SYM_CODE_START(mcck_int_handler)
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xgr %r6,%r6
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xgr %r7,%r7
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xgr %r10,%r10
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mvc __PT_R8(64,%r11),0(%r14)
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stmg %r8,%r9,__PT_PSW(%r11)
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xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
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xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
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