mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-26 12:34:41 +08:00
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>
42 lines
895 B
ArmAsm
42 lines
895 B
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* arch/s390/kernel/base.S
|
|
*
|
|
* Copyright IBM Corp. 2006, 2007
|
|
* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
|
|
* Michael Holzheu <holzheu@de.ibm.com>
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/nospec-insn.h>
|
|
#include <asm/ptrace.h>
|
|
|
|
GEN_BR_THUNK %r9
|
|
GEN_BR_THUNK %r14
|
|
|
|
ENTRY(s390_base_pgm_handler)
|
|
stmg %r0,%r15,__LC_SAVE_AREA_SYNC
|
|
basr %r13,0
|
|
0: aghi %r15,-STACK_FRAME_OVERHEAD
|
|
larl %r1,s390_base_pgm_handler_fn
|
|
lg %r9,0(%r1)
|
|
ltgr %r9,%r9
|
|
jz 1f
|
|
BASR_EX %r14,%r9
|
|
lmg %r0,%r15,__LC_SAVE_AREA_SYNC
|
|
lpswe __LC_PGM_OLD_PSW
|
|
1: lpswe disabled_wait_psw-0b(%r13)
|
|
ENDPROC(s390_base_pgm_handler)
|
|
|
|
.align 8
|
|
disabled_wait_psw:
|
|
.quad 0x0002000180000000,0x0000000000000000 + s390_base_pgm_handler
|
|
|
|
.section .bss
|
|
.align 8
|
|
.globl s390_base_pgm_handler_fn
|
|
s390_base_pgm_handler_fn:
|
|
.quad 0
|
|
.previous
|