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f38b0a7439
s390_base_ext_handler_fn haven't been used since its introduction in
commit ab14de6c37 ("[S390] Convert memory detection into C code.").
s390_base_ext_handler itself is currently falsely storing 16 registers
at __LC_SAVE_AREA_ASYNC rewriting several following lowcore values:
cpu_flags, return_psw, return_mcck_psw, sync_enter_timer and
async_enter_timer.
Besides that s390_base_ext_handler itself is only potentially hiding
EXT interrupts which should not have happen in the first place. Any
piece of code which requires EXT interrupts before fully functional
ext_int_handler is enabled has to do it on its own, like this is done
by sclp_early_cmd() which is doing EXT interrupts handling synchronously
in sclp_early_wait_irq().
With s390_base_ext_handler removed unexpected EXT interrupt leads
to disabled wait with the address 0x1b0 (__LC_EXT_NEW_PSW), which is
currently setup in the decompressor.
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
41 lines
895 B
ArmAsm
41 lines
895 B
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* arch/s390/kernel/base.S
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*
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* Copyright IBM Corp. 2006, 2007
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* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
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* Michael Holzheu <holzheu@de.ibm.com>
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*/
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#include <linux/linkage.h>
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#include <asm/asm-offsets.h>
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#include <asm/nospec-insn.h>
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#include <asm/ptrace.h>
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GEN_BR_THUNK %r9
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GEN_BR_THUNK %r14
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ENTRY(s390_base_pgm_handler)
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stmg %r0,%r15,__LC_SAVE_AREA_SYNC
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basr %r13,0
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0: aghi %r15,-STACK_FRAME_OVERHEAD
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larl %r1,s390_base_pgm_handler_fn
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lg %r9,0(%r1)
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ltgr %r9,%r9
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jz 1f
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BASR_EX %r14,%r9
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lmg %r0,%r15,__LC_SAVE_AREA_SYNC
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lpswe __LC_PGM_OLD_PSW
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1: lpswe disabled_wait_psw-0b(%r13)
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ENDPROC(s390_base_pgm_handler)
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.align 8
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disabled_wait_psw:
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.quad 0x0002000180000000,0x0000000000000000 + s390_base_pgm_handler
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.section .bss
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.align 8
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.globl s390_base_pgm_handler_fn
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s390_base_pgm_handler_fn:
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.quad 0
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.previous
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