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[S390] cleanup lowcore access from program checks

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Read all required fields for program checks from the lowcore in the
first level interrupt handler in entry[64].S. If the context that
caused the fault was enabled for interrupts we can now re-enable the
irqs in entry[64].S.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
2010-10-25 16:10:37 +02:00
committed by Martin Schwidefsky
parent 84afdcee62
commit 1e54622e04
6 changed files with 109 additions and 171 deletions
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36
arch/s390/kernel/entry64.S
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@@ -79,25 +79,9 @@ _TIF_SYSCALL = (_TIF_SYSCALL_TRACE>>8 | _TIF_SYSCALL_AUDIT>>8 | \
basr %r2,%r0
brasl %r14,trace_hardirqs_off_caller
.endm
.macro TRACE_IRQS_CHECK_ON
tm SP_PSW(%r15),0x03 # irqs enabled?
jz 0f
TRACE_IRQS_ON
0:
.endm
.macro TRACE_IRQS_CHECK_OFF
tm SP_PSW(%r15),0x03 # irqs enabled?
jz 0f
TRACE_IRQS_OFF
0:
.endm
#else
#define TRACE_IRQS_ON
#define TRACE_IRQS_OFF
#define TRACE_IRQS_CHECK_ON
#define TRACE_IRQS_CHECK_OFF
#endif
#ifdef CONFIG_LOCKDEP
@@ -207,6 +191,12 @@ _TIF_SYSCALL = (_TIF_SYSCALL_TRACE>>8 | _TIF_SYSCALL_AUDIT>>8 | \
0:
.endm
.macro REENABLE_IRQS
mvc __SF_EMPTY(1,%r15),SP_PSW(%r15)
ni __SF_EMPTY(%r15),0xbf
ssm __SF_EMPTY(%r15)
.endm
/*
* Scheduler resume function, called by switch_to
* gpr2 = (task_struct *) prev
@@ -443,14 +433,12 @@ kernel_execve:
br %r14
# execve succeeded.
0: stnsm __SF_EMPTY(%r15),0xfc # disable interrupts
# TRACE_IRQS_OFF
lg %r15,__LC_KERNEL_STACK # load ksp
aghi %r15,-SP_SIZE # make room for registers & psw
lg %r13,__LC_SVC_NEW_PSW+8
mvc SP_PTREGS(__PT_SIZE,%r15),0(%r12) # copy pt_regs
lg %r12,__LC_THREAD_INFO
xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
# TRACE_IRQS_ON
stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
brasl %r14,execve_tail
j sysc_return
@@ -490,19 +478,18 @@ pgm_check_handler:
LAST_BREAK
pgm_no_vtime:
HANDLE_SIE_INTERCEPT
TRACE_IRQS_CHECK_OFF
stg %r11,SP_ARGS(%r15)
lgf %r3,__LC_PGM_ILC # load program interruption code
lg %r4,__LC_TRANS_EXC_CODE
REENABLE_IRQS
lghi %r8,0x7f
ngr %r8,%r3
pgm_do_call:
sll %r8,3
larl %r1,pgm_check_table
lg %r1,0(%r8,%r1) # load address of handler routine
la %r2,SP_PTREGS(%r15) # address of register-save area
basr %r14,%r1 # branch to interrupt-handler
pgm_exit:
TRACE_IRQS_CHECK_ON
j sysc_return
#
@@ -533,7 +520,6 @@ pgm_per_std:
LAST_BREAK
pgm_no_vtime2:
HANDLE_SIE_INTERCEPT
TRACE_IRQS_CHECK_OFF
lg %r1,__TI_task(%r12)
tm SP_PSW+1(%r15),0x01 # kernel per event ?
jz kernel_per
@@ -542,6 +528,8 @@ pgm_no_vtime2:
mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID
oi __TI_flags+7(%r12),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP
lgf %r3,__LC_PGM_ILC # load program interruption code
lg %r4,__LC_TRANS_EXC_CODE
REENABLE_IRQS
lghi %r8,0x7f
ngr %r8,%r3 # clear per-event-bit and ilc
je pgm_exit2
@@ -551,8 +539,6 @@ pgm_no_vtime2:
la %r2,SP_PTREGS(%r15) # address of register-save area
basr %r14,%r1 # branch to interrupt-handler
pgm_exit2:
TRACE_IRQS_ON
stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
j sysc_return
#
@@ -568,13 +554,11 @@ pgm_svcper:
UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
LAST_BREAK
TRACE_IRQS_OFF
lg %r8,__TI_task(%r12)
mvc __THREAD_per+__PER_atmid(2,%r8),__LC_PER_ATMID
mvc __THREAD_per+__PER_address(8,%r8),__LC_PER_ADDRESS
mvc __THREAD_per+__PER_access_id(1,%r8),__LC_PER_ACCESS_ID
oi __TI_flags+7(%r12),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP
TRACE_IRQS_ON
stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
lmg %r2,%r6,SP_R2(%r15) # load svc arguments
j sysc_do_svc