* arch/s390/kernel/entry.S
* S390 low-level entry points.
*
- * S390 version
- * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ * Copyright (C) IBM Corp. 1999,2006
* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
* Hartmut Penner (hp@de.ibm.com),
* Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
+ * Heiko Carstens <heiko.carstens@de.ibm.com>
*/
#include <linux/sys.h>
#include <linux/linkage.h>
-#include <linux/config.h>
#include <asm/cache.h>
#include <asm/lowcore.h>
#include <asm/errno.h>
#include <asm/ptrace.h>
#include <asm/thread_info.h>
-#include <asm/offsets.h>
+#include <asm/asm-offsets.h>
#include <asm/unistd.h>
+#include <asm/page.h>
/*
* Stack layout for the system_call stack entry.
SP_TRAP = STACK_FRAME_OVERHEAD + __PT_TRAP
SP_SIZE = STACK_FRAME_OVERHEAD + __PT_SIZE
-_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
- _TIF_RESTART_SVC | _TIF_SINGLE_STEP )
-_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NEED_RESCHED)
+_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK | _TIF_NEED_RESCHED | \
+ _TIF_MCCK_PENDING | _TIF_RESTART_SVC | _TIF_SINGLE_STEP )
+_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK | _TIF_NEED_RESCHED | \
+ _TIF_MCCK_PENDING)
+
+STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER
+STACK_SIZE = 1 << STACK_SHIFT
#define BASED(name) name-system_call(%r13)
+#ifdef CONFIG_TRACE_IRQFLAGS
+ .macro TRACE_IRQS_ON
+ l %r1,BASED(.Ltrace_irq_on)
+ basr %r14,%r1
+ .endm
+
+ .macro TRACE_IRQS_OFF
+ l %r1,BASED(.Ltrace_irq_off)
+ basr %r14,%r1
+ .endm
+#else
+#define TRACE_IRQS_ON
+#define TRACE_IRQS_OFF
+#endif
+
/*
* Register usage in interrupt handlers:
* R9 - pointer to current task structure
* R15 - kernel stack pointer
*/
+ .macro STORE_TIMER lc_offset
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+ stpt \lc_offset
+#endif
+ .endm
+
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+ .macro UPDATE_VTIME lc_from,lc_to,lc_sum
+ lm %r10,%r11,\lc_from
+ sl %r10,\lc_to
+ sl %r11,\lc_to+4
+ bc 3,BASED(0f)
+ sl %r10,BASED(.Lc_1)
+0: al %r10,\lc_sum
+ al %r11,\lc_sum+4
+ bc 12,BASED(1f)
+ al %r10,BASED(.Lc_1)
+1: stm %r10,%r11,\lc_sum
+ .endm
+#endif
+
.macro SAVE_ALL_BASE savearea
stm %r12,%r15,\savearea
l %r13,__LC_SVC_NEW_PSW+4 # load &system_call to %r13
.endm
- .macro SAVE_ALL psworg,savearea,sync
+ .macro SAVE_ALL_SYNC psworg,savearea
la %r12,\psworg
- .if \sync
tm \psworg+1,0x01 # test problem state bit
bz BASED(2f) # skip stack setup save
l %r15,__LC_KERNEL_STACK # problem state -> load ksp
- .else
+#ifdef CONFIG_CHECK_STACK
+ b BASED(3f)
+2: tml %r15,STACK_SIZE - CONFIG_STACK_GUARD
+ bz BASED(stack_overflow)
+3:
+#endif
+2:
+ .endm
+
+ .macro SAVE_ALL_ASYNC psworg,savearea
+ la %r12,\psworg
tm \psworg+1,0x01 # test problem state bit
bnz BASED(1f) # from user -> load async stack
clc \psworg+4(4),BASED(.Lcritical_end)
bl BASED(0f)
l %r14,BASED(.Lcleanup_critical)
basr %r14,%r14
- tm 0(%r12),0x01 # retest problem state after cleanup
+ tm 1(%r12),0x01 # retest problem state after cleanup
bnz BASED(1f)
0: l %r14,__LC_ASYNC_STACK # are we already on the async stack ?
slr %r14,%r15
- sra %r14,13
+ sra %r14,STACK_SHIFT
be BASED(2f)
1: l %r15,__LC_ASYNC_STACK
- .endif
-2: s %r15,BASED(.Lc_spsize) # make room for registers & psw
+#ifdef CONFIG_CHECK_STACK
+ b BASED(3f)
+2: tml %r15,STACK_SIZE - CONFIG_STACK_GUARD
+ bz BASED(stack_overflow)
+3:
+#endif
+2:
+ .endm
+
+ .macro CREATE_STACK_FRAME psworg,savearea
+ s %r15,BASED(.Lc_spsize) # make room for registers & psw
mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack
la %r12,\psworg
st %r2,SP_ORIG_R2(%r15) # store original content of gpr 2
st %r12,SP_ILC(%r15)
mvc SP_R12(16,%r15),\savearea # move %r12-%r15 to stack
la %r12,0
- st %r12,0(%r15) # clear back chain
+ st %r12,__SF_BACKCHAIN(%r15) # clear back chain
.endm
- .macro RESTORE_ALL sync
- mvc __LC_RETURN_PSW(8),SP_PSW(%r15) # move user PSW to lowcore
+ .macro RESTORE_ALL psworg,sync
+ mvc \psworg(8),SP_PSW(%r15) # move user PSW to lowcore
.if !\sync
- ni __LC_RETURN_PSW+1,0xfd # clear wait state bit
+ ni \psworg+1,0xfd # clear wait state bit
.endif
lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 of user
- lpsw __LC_RETURN_PSW # back to caller
+ STORE_TIMER __LC_EXIT_TIMER
+ lpsw \psworg # back to caller
.endm
/*
__switch_to_base:
tm __THREAD_per(%r3),0xe8 # new process is using per ?
bz __switch_to_noper-__switch_to_base(%r1) # if not we're fine
- stctl %c9,%c11,24(%r15) # We are using per stuff
- clc __THREAD_per(12,%r3),24(%r15)
+ stctl %c9,%c11,__SF_EMPTY(%r15) # We are using per stuff
+ clc __THREAD_per(12,%r3),__SF_EMPTY(%r15)
be __switch_to_noper-__switch_to_base(%r1) # we got away w/o bashing TLB's
lctl %c9,%c11,__THREAD_per(%r3) # Nope we didn't
__switch_to_noper:
- stm %r6,%r15,24(%r15) # store __switch_to registers of prev task
+ l %r4,__THREAD_info(%r2) # get thread_info of prev
+ tm __TI_flags+3(%r4),_TIF_MCCK_PENDING # machine check pending?
+ bz __switch_to_no_mcck-__switch_to_base(%r1)
+ ni __TI_flags+3(%r4),255-_TIF_MCCK_PENDING # clear flag in prev
+ l %r4,__THREAD_info(%r3) # get thread_info of next
+ oi __TI_flags+3(%r4),_TIF_MCCK_PENDING # set it in next
+__switch_to_no_mcck:
+ stm %r6,%r15,__SF_GPRS(%r15)# store __switch_to registers of prev task
st %r15,__THREAD_ksp(%r2) # store kernel stack to prev->tss.ksp
l %r15,__THREAD_ksp(%r3) # load kernel stack from next->tss.ksp
- lm %r6,%r15,24(%r15) # load __switch_to registers of next task
+ lm %r6,%r15,__SF_GPRS(%r15)# load __switch_to registers of next task
st %r3,__LC_CURRENT # __LC_CURRENT = current task struct
+ lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4
l %r3,__THREAD_info(%r3) # load thread_info from task struct
st %r3,__LC_THREAD_INFO
- ahi %r3,8192
+ ahi %r3,STACK_SIZE
st %r3,__LC_KERNEL_STACK # __LC_KERNEL_STACK = new kernel stack
br %r14
-/*
- * do_softirq calling function. We want to run the softirq functions on the
- * asynchronous interrupt stack.
- */
- .global do_call_softirq
-do_call_softirq:
- stnsm 24(%r15),0xfc
- stm %r12,%r15,28(%r15)
- lr %r12,%r15
- basr %r13,0
-do_call_base:
- l %r0,__LC_ASYNC_STACK
- slr %r0,%r15
- sra %r0,13
- be 0f-do_call_base(%r13)
- l %r15,__LC_ASYNC_STACK
-0: sl %r15,.Lc_overhead-do_call_base(%r13)
- st %r12,0(%r15) # store backchain
- l %r1,.Ldo_softirq-do_call_base(%r13)
- basr %r14,%r1
- lm %r12,%r15,28(%r12)
- ssm 24(%r15)
- br %r14
-
__critical_start:
/*
* SVC interrupt handler routine. System calls are synchronous events and
.globl system_call
system_call:
+ STORE_TIMER __LC_SYNC_ENTER_TIMER
+sysc_saveall:
SAVE_ALL_BASE __LC_SAVE_AREA
- SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
+ SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
+ CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
lh %r7,0x8a # get svc number from lowcore
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+sysc_vtime:
+ tm SP_PSW+1(%r15),0x01 # interrupting from user ?
+ bz BASED(sysc_do_svc)
+ UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
+sysc_stime:
+ UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
+sysc_update:
+ mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
+#endif
sysc_do_svc:
l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
sla %r7,2 # *4 and test for svc 0
sysc_nr_ok:
mvc SP_ARGS(4,%r15),SP_R7(%r15)
sysc_do_restart:
+ l %r8,BASED(.Lsysc_table)
tm __TI_flags+3(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
- l %r8,sys_call_table-system_call(%r7,%r13) # get system call addr.
+ l %r8,0(%r7,%r8) # get system call addr.
bnz BASED(sysc_tracesys)
basr %r14,%r8 # call sys_xxxx
st %r2,SP_R2(%r15) # store return value (change R2 on stack)
tm __TI_flags+3(%r9),_TIF_WORK_SVC
bnz BASED(sysc_work) # there is work to do (signals etc.)
sysc_leave:
- RESTORE_ALL 1
+ RESTORE_ALL __LC_RETURN_PSW,1
#
# recheck if there is more work to do
# One of the work bits is on. Find out which one.
#
sysc_work:
+ tm __TI_flags+3(%r9),_TIF_MCCK_PENDING
+ bo BASED(sysc_mcck_pending)
tm __TI_flags+3(%r9),_TIF_NEED_RESCHED
bo BASED(sysc_reschedule)
- tm __TI_flags+3(%r9),_TIF_SIGPENDING
- bo BASED(sysc_sigpending)
+ tm __TI_flags+3(%r9),(_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK)
+ bnz BASED(sysc_sigpending)
tm __TI_flags+3(%r9),_TIF_RESTART_SVC
bo BASED(sysc_restart)
tm __TI_flags+3(%r9),_TIF_SINGLE_STEP
br %r1 # call scheduler
#
-# _TIF_SIGPENDING is set, call do_signal
+# _TIF_MCCK_PENDING is set, call handler
+#
+sysc_mcck_pending:
+ l %r1,BASED(.Ls390_handle_mcck)
+ la %r14,BASED(sysc_work_loop)
+ br %r1 # TIF bit will be cleared by handler
+
+#
+# _TIF_SIGPENDING or _TIF_RESTORE_SIGMASK is set, call do_signal
#
sysc_sigpending:
ni __TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
la %r2,SP_PTREGS(%r15) # load pt_regs
- sr %r3,%r3 # clear *oldset
l %r1,BASED(.Ldo_signal)
basr %r14,%r1 # call do_signal
tm __TI_flags+3(%r9),_TIF_RESTART_SVC
bo BASED(sysc_restart)
- b BASED(sysc_leave) # out of here, do NOT recheck
+ tm __TI_flags+3(%r9),_TIF_SINGLE_STEP
+ bo BASED(sysc_singlestep)
+ b BASED(sysc_work_loop)
#
# _TIF_RESTART_SVC is set, set up registers and restart svc
la %r14,BASED(sysc_return) # load adr. of system return
br %r1 # branch to do_single_step
-__critical_end:
-
#
# call trace before and after sys_call
#
basr %r14,%r1
clc SP_R2(4,%r15),BASED(.Lnr_syscalls)
bnl BASED(sysc_tracenogo)
+ l %r8,BASED(.Lsysc_table)
l %r7,SP_R2(%r15) # strace might have changed the
sll %r7,2 # system call
- l %r8,sys_call_table-system_call(%r7,%r13)
+ l %r8,0(%r7,%r8)
sysc_tracego:
lm %r3,%r6,SP_R3(%r15)
l %r2,SP_ORIG_R2(%r15)
ret_from_fork:
l %r13,__LC_SVC_NEW_PSW+4
l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
- l %r1,BASED(.Lschedtail)
+ tm SP_PSW+1(%r15),0x01 # forking a kernel thread ?
+ bo BASED(0f)
+ st %r15,SP_R15(%r15) # store stack pointer for new kthread
+0: l %r1,BASED(.Lschedtail)
basr %r14,%r1
- stosm 24(%r15),0x03 # reenable interrupts
+ TRACE_IRQS_ON
+ stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
b BASED(sysc_return)
#
l %r1,BASED(.Lrt_sigreturn)
br %r1 # branch to sys_sigreturn
-#
-# sigsuspend and rt_sigsuspend need pt_regs as an additional
-# parameter and they have to skip the store of %r2 into the
-# user register %r2 because the return value was set in
-# sigsuspend and rt_sigsuspend already and must not be overwritten!
-#
-
-sys_sigsuspend_glue:
- lr %r5,%r4 # move mask back
- lr %r4,%r3 # move history1 parameter
- lr %r3,%r2 # move history0 parameter
- la %r2,SP_PTREGS(%r15) # load pt_regs as first parameter
- l %r1,BASED(.Lsigsuspend)
- la %r14,4(%r14) # skip store of return value
- br %r1 # branch to sys_sigsuspend
-
-sys_rt_sigsuspend_glue:
- lr %r4,%r3 # move sigsetsize parameter
- lr %r3,%r2 # move unewset parameter
- la %r2,SP_PTREGS(%r15) # load pt_regs as first parameter
- l %r1,BASED(.Lrt_sigsuspend)
- la %r14,4(%r14) # skip store of return value
- br %r1 # branch to sys_rt_sigsuspend
-
sys_sigaltstack_glue:
la %r4,SP_PTREGS(%r15) # load pt_regs as parameter
l %r1,BASED(.Lsigaltstack)
* we just ignore the PER event (FIXME: is there anything we have to do
* for LPSW?).
*/
+ STORE_TIMER __LC_SYNC_ENTER_TIMER
SAVE_ALL_BASE __LC_SAVE_AREA
tm __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception
bnz BASED(pgm_per) # got per exception -> special case
- SAVE_ALL __LC_PGM_OLD_PSW,__LC_SAVE_AREA,1
+ SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA
+ CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+ tm SP_PSW+1(%r15),0x01 # interrupting from user ?
+ bz BASED(pgm_no_vtime)
+ UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
+ UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
+ mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
+pgm_no_vtime:
+#endif
l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
l %r3,__LC_PGM_ILC # load program interruption code
la %r8,0x7f
# Normal per exception
#
pgm_per_std:
- SAVE_ALL __LC_PGM_OLD_PSW,__LC_SAVE_AREA,1
+ SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA
+ CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+ tm SP_PSW+1(%r15),0x01 # interrupting from user ?
+ bz BASED(pgm_no_vtime2)
+ UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
+ UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
+ mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
+pgm_no_vtime2:
+#endif
l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
l %r1,__TI_task(%r9)
mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID
# it was a single stepped SVC that is causing all the trouble
#
pgm_svcper:
- SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
+ SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
+ CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+ tm SP_PSW+1(%r15),0x01 # interrupting from user ?
+ bz BASED(pgm_no_vtime3)
+ UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
+ UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
+ mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
+pgm_no_vtime3:
+#endif
lh %r7,0x8a # get svc number from lowcore
l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
l %r1,__TI_task(%r9)
mvc __THREAD_per+__PER_address(4,%r1),__LC_PER_ADDRESS
mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID
oi __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP
- stosm 24(%r15),0x03 # reenable interrupts
+ TRACE_IRQS_ON
+ stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
b BASED(sysc_do_svc)
/*
.globl io_int_handler
io_int_handler:
+ STORE_TIMER __LC_ASYNC_ENTER_TIMER
stck __LC_INT_CLOCK
SAVE_ALL_BASE __LC_SAVE_AREA+16
- SAVE_ALL __LC_IO_OLD_PSW,__LC_SAVE_AREA+16,0
+ SAVE_ALL_ASYNC __LC_IO_OLD_PSW,__LC_SAVE_AREA+16
+ CREATE_STACK_FRAME __LC_IO_OLD_PSW,__LC_SAVE_AREA+16
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+ tm SP_PSW+1(%r15),0x01 # interrupting from user ?
+ bz BASED(io_no_vtime)
+ UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
+ UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
+ mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
+io_no_vtime:
+#endif
l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
+ TRACE_IRQS_OFF
l %r1,BASED(.Ldo_IRQ) # load address of do_IRQ
la %r2,SP_PTREGS(%r15) # address of register-save area
basr %r14,%r1 # branch to standard irq handler
+ TRACE_IRQS_ON
io_return:
tm SP_PSW+1(%r15),0x01 # returning to user ?
tm __TI_flags+3(%r9),_TIF_WORK_INT
bnz BASED(io_work) # there is work to do (signals etc.)
io_leave:
- RESTORE_ALL 0
+ RESTORE_ALL __LC_RETURN_PSW,0
+io_done:
#ifdef CONFIG_PREEMPT
io_preempt:
l %r1,SP_R15(%r15)
s %r1,BASED(.Lc_spsize)
mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
- xc 0(4,%r1),0(%r1) # clear back chain
+ xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain
lr %r15,%r1
io_resume_loop:
tm __TI_flags+3(%r9),_TIF_NEED_RESCHED
bno BASED(io_leave)
mvc __TI_precount(4,%r9),BASED(.Lc_pactive)
- stosm 24(%r15),0x03 # reenable interrupts
+ stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
l %r1,BASED(.Lschedule)
basr %r14,%r1 # call schedule
- stnsm 24(%r15),0xfc # disable I/O and ext. interrupts
+ stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts
xc __TI_precount(4,%r9),__TI_precount(%r9)
b BASED(io_resume_loop)
#endif
l %r1,__LC_KERNEL_STACK
s %r1,BASED(.Lc_spsize)
mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
- xc 0(4,%r1),0(%r1) # clear back chain
+ xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain
lr %r15,%r1
#
# One of the work bits is on. Find out which one.
-# Checked are: _TIF_SIGPENDING and _TIF_NEED_RESCHED
+# Checked are: _TIF_SIGPENDING, _TIF_RESTORE_SIGMASK, _TIF_NEED_RESCHED
+# and _TIF_MCCK_PENDING
#
io_work_loop:
+ tm __TI_flags+3(%r9),_TIF_MCCK_PENDING
+ bo BASED(io_mcck_pending)
tm __TI_flags+3(%r9),_TIF_NEED_RESCHED
bo BASED(io_reschedule)
- tm __TI_flags+3(%r9),_TIF_SIGPENDING
- bo BASED(io_sigpending)
+ tm __TI_flags+3(%r9),(_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK)
+ bnz BASED(io_sigpending)
b BASED(io_leave)
+#
+# _TIF_MCCK_PENDING is set, call handler
+#
+io_mcck_pending:
+ l %r1,BASED(.Ls390_handle_mcck)
+ la %r14,BASED(io_work_loop)
+ br %r1 # TIF bit will be cleared by handler
+
#
# _TIF_NEED_RESCHED is set, call schedule
#
io_reschedule:
l %r1,BASED(.Lschedule)
- stosm 24(%r15),0x03 # reenable interrupts
+ stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
basr %r14,%r1 # call scheduler
- stnsm 24(%r15),0xfc # disable I/O and ext. interrupts
+ stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts
tm __TI_flags+3(%r9),_TIF_WORK_INT
bz BASED(io_leave) # there is no work to do
b BASED(io_work_loop)
#
-# _TIF_SIGPENDING is set, call do_signal
+# _TIF_SIGPENDING or _TIF_RESTORE_SIGMASK is set, call do_signal
#
io_sigpending:
- stosm 24(%r15),0x03 # reenable interrupts
+ stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
la %r2,SP_PTREGS(%r15) # load pt_regs
- sr %r3,%r3 # clear *oldset
l %r1,BASED(.Ldo_signal)
basr %r14,%r1 # call do_signal
- stnsm 24(%r15),0xfc # disable I/O and ext. interrupts
- b BASED(io_leave) # out of here, do NOT recheck
+ stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts
+ b BASED(io_work_loop)
/*
* External interrupt handler routine
.globl ext_int_handler
ext_int_handler:
+ STORE_TIMER __LC_ASYNC_ENTER_TIMER
stck __LC_INT_CLOCK
SAVE_ALL_BASE __LC_SAVE_AREA+16
- SAVE_ALL __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16,0
+ SAVE_ALL_ASYNC __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16
+ CREATE_STACK_FRAME __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+ tm SP_PSW+1(%r15),0x01 # interrupting from user ?
+ bz BASED(ext_no_vtime)
+ UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
+ UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
+ mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
+ext_no_vtime:
+#endif
l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
+ TRACE_IRQS_OFF
la %r2,SP_PTREGS(%r15) # address of register-save area
lh %r3,__LC_EXT_INT_CODE # get interruption code
l %r1,BASED(.Ldo_extint)
basr %r14,%r1
+ TRACE_IRQS_ON
b BASED(io_return)
+__critical_end:
+
/*
* Machine check handler routines
*/
.globl mcck_int_handler
mcck_int_handler:
+ spt __LC_CPU_TIMER_SAVE_AREA # revalidate cpu timer
+ lm %r0,%r15,__LC_GPREGS_SAVE_AREA # revalidate gprs
SAVE_ALL_BASE __LC_SAVE_AREA+32
- SAVE_ALL __LC_MCK_OLD_PSW,__LC_SAVE_AREA+32,0
+ la %r12,__LC_MCK_OLD_PSW
+ tm __LC_MCCK_CODE,0x80 # system damage?
+ bo BASED(mcck_int_main) # yes -> rest of mcck code invalid
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+ mvc __LC_SAVE_AREA+52(8),__LC_ASYNC_ENTER_TIMER
+ mvc __LC_ASYNC_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA
+ tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid?
+ bo BASED(1f)
+ la %r14,__LC_SYNC_ENTER_TIMER
+ clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER
+ bl BASED(0f)
+ la %r14,__LC_ASYNC_ENTER_TIMER
+0: clc 0(8,%r14),__LC_EXIT_TIMER
+ bl BASED(0f)
+ la %r14,__LC_EXIT_TIMER
+0: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER
+ bl BASED(0f)
+ la %r14,__LC_LAST_UPDATE_TIMER
+0: spt 0(%r14)
+ mvc __LC_ASYNC_ENTER_TIMER(8),0(%r14)
+1:
+#endif
+ tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid?
+ bno BASED(mcck_int_main) # no -> skip cleanup critical
+ tm __LC_MCK_OLD_PSW+1,0x01 # test problem state bit
+ bnz BASED(mcck_int_main) # from user -> load async stack
+ clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_end)
+ bhe BASED(mcck_int_main)
+ clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_start)
+ bl BASED(mcck_int_main)
+ l %r14,BASED(.Lcleanup_critical)
+ basr %r14,%r14
+mcck_int_main:
+ l %r14,__LC_PANIC_STACK # are we already on the panic stack?
+ slr %r14,%r15
+ sra %r14,PAGE_SHIFT
+ be BASED(0f)
+ l %r15,__LC_PANIC_STACK # load panic stack
+0: CREATE_STACK_FRAME __LC_MCK_OLD_PSW,__LC_SAVE_AREA+32
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+ tm __LC_MCCK_CODE+2,0x08 # mwp of old psw valid?
+ bno BASED(mcck_no_vtime) # no -> skip cleanup critical
+ tm SP_PSW+1(%r15),0x01 # interrupting from user ?
+ bz BASED(mcck_no_vtime)
+ UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
+ UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
+ mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
+mcck_no_vtime:
+#endif
+ l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
+ la %r2,SP_PTREGS(%r15) # load pt_regs
l %r1,BASED(.Ls390_mcck)
- basr %r14,%r1 # call machine check handler
+ basr %r14,%r1 # call machine check handler
+ tm SP_PSW+1(%r15),0x01 # returning to user ?
+ bno BASED(mcck_return)
+ l %r1,__LC_KERNEL_STACK # switch to kernel stack
+ s %r1,BASED(.Lc_spsize)
+ mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
+ xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain
+ lr %r15,%r1
+ stosm __SF_EMPTY(%r15),0x04 # turn dat on
+ tm __TI_flags+3(%r9),_TIF_MCCK_PENDING
+ bno BASED(mcck_return)
+ TRACE_IRQS_OFF
+ l %r1,BASED(.Ls390_handle_mcck)
+ basr %r14,%r1 # call machine check handler
+ TRACE_IRQS_ON
mcck_return:
- RESTORE_ALL 0
+ mvc __LC_RETURN_MCCK_PSW(8),SP_PSW(%r15) # move return PSW
+ ni __LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+ mvc __LC_ASYNC_ENTER_TIMER(8),__LC_SAVE_AREA+52
+ tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ?
+ bno BASED(0f)
+ lm %r0,%r15,SP_R0(%r15) # load gprs 0-15
+ stpt __LC_EXIT_TIMER
+ lpsw __LC_RETURN_MCCK_PSW # back to caller
+0:
+#endif
+ lm %r0,%r15,SP_R0(%r15) # load gprs 0-15
+ lpsw __LC_RETURN_MCCK_PSW # back to caller
+
+ RESTORE_ALL __LC_RETURN_MCCK_PSW,0
#ifdef CONFIG_SMP
/*
l %r15,__LC_SAVE_AREA+60 # load ksp
lctl %c0,%c15,__LC_CREGS_SAVE_AREA # get new ctl regs
lam %a0,%a15,__LC_AREGS_SAVE_AREA
- stosm 0(%r15),0x04 # now we can turn dat on
- lm %r6,%r15,24(%r15) # load registers from clone
+ lm %r6,%r15,__SF_GPRS(%r15) # load registers from clone
+ stosm __SF_EMPTY(%r15),0x04 # now we can turn dat on
basr %r14,0
l %r14,restart_addr-.(%r14)
br %r14 # branch to start_secondary
restart_go:
#endif
+#ifdef CONFIG_CHECK_STACK
+/*
+ * The synchronous or the asynchronous stack overflowed. We are dead.
+ * No need to properly save the registers, we are going to panic anyway.
+ * Setup a pt_regs so that show_trace can provide a good call trace.
+ */
+stack_overflow:
+ l %r15,__LC_PANIC_STACK # change to panic stack
+ sl %r15,BASED(.Lc_spsize)
+ mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack
+ stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack
+ la %r1,__LC_SAVE_AREA
+ ch %r12,BASED(.L0x020) # old psw addr == __LC_SVC_OLD_PSW ?
+ be BASED(0f)
+ ch %r12,BASED(.L0x028) # old psw addr == __LC_PGM_OLD_PSW ?
+ be BASED(0f)
+ la %r1,__LC_SAVE_AREA+16
+0: mvc SP_R12(16,%r15),0(%r1) # move %r12-%r15 to stack
+ xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear back chain
+ l %r1,BASED(1f) # branch to kernel_stack_overflow
+ la %r2,SP_PTREGS(%r15) # load pt_regs
+ br %r1
+1: .long kernel_stack_overflow
+#endif
+
cleanup_table_system_call:
.long system_call + 0x80000000, sysc_do_svc + 0x80000000
cleanup_table_sysc_return:
.long sysc_leave + 0x80000000, sysc_work_loop + 0x80000000
cleanup_table_sysc_work_loop:
.long sysc_work_loop + 0x80000000, sysc_reschedule + 0x80000000
+cleanup_table_io_return:
+ .long io_return + 0x80000000, io_leave + 0x80000000
+cleanup_table_io_leave:
+ .long io_leave + 0x80000000, io_done + 0x80000000
+cleanup_table_io_work_loop:
+ .long io_work_loop + 0x80000000, io_mcck_pending + 0x80000000
cleanup_critical:
clc 4(4,%r12),BASED(cleanup_table_system_call)
clc 4(4,%r12),BASED(cleanup_table_sysc_work_loop)
bl BASED(0f)
clc 4(4,%r12),BASED(cleanup_table_sysc_work_loop+4)
- bl BASED(cleanup_sysc_leave)
+ bl BASED(cleanup_sysc_return)
+0:
+ clc 4(4,%r12),BASED(cleanup_table_io_return)
+ bl BASED(0f)
+ clc 4(4,%r12),BASED(cleanup_table_io_return+4)
+ bl BASED(cleanup_io_return)
+0:
+ clc 4(4,%r12),BASED(cleanup_table_io_leave)
+ bl BASED(0f)
+ clc 4(4,%r12),BASED(cleanup_table_io_leave+4)
+ bl BASED(cleanup_io_leave)
+0:
+ clc 4(4,%r12),BASED(cleanup_table_io_work_loop)
+ bl BASED(0f)
+ clc 4(4,%r12),BASED(cleanup_table_io_work_loop+4)
+ bl BASED(cleanup_io_return)
0:
br %r14
cleanup_system_call:
- mvc __LC_RETURN_PSW(4),0(%r12)
- clc 4(4,%r12),BASED(cleanup_table_system_call)
- bne BASED(0f)
- mvc __LC_SAVE_AREA(16),__LC_SAVE_AREA+16
-0: st %r13,__LC_SAVE_AREA+20
- SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
- st %r15,__LC_SAVE_AREA+28
+ mvc __LC_RETURN_PSW(8),0(%r12)
+ c %r12,BASED(.Lmck_old_psw)
+ be BASED(0f)
+ la %r12,__LC_SAVE_AREA+16
+ b BASED(1f)
+0: la %r12,__LC_SAVE_AREA+32
+1:
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+ clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+4)
+ bh BASED(0f)
+ mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER
+0: clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+8)
+ bhe BASED(cleanup_vtime)
+#endif
+ clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn)
+ bh BASED(0f)
+ mvc __LC_SAVE_AREA(16),0(%r12)
+0: st %r13,4(%r12)
+ st %r12,__LC_SAVE_AREA+48 # argh
+ SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
+ CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
+ l %r12,__LC_SAVE_AREA+48 # argh
+ st %r15,12(%r12)
lh %r7,0x8a
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+cleanup_vtime:
+ clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+12)
+ bhe BASED(cleanup_stime)
+ tm SP_PSW+1(%r15),0x01 # interrupting from user ?
+ bz BASED(cleanup_novtime)
+ UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
+cleanup_stime:
+ clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+16)
+ bh BASED(cleanup_update)
+ UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
+cleanup_update:
+ mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
+cleanup_novtime:
+#endif
mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_system_call+4)
la %r12,__LC_RETURN_PSW
br %r14
+cleanup_system_call_insn:
+ .long sysc_saveall + 0x80000000
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+ .long system_call + 0x80000000
+ .long sysc_vtime + 0x80000000
+ .long sysc_stime + 0x80000000
+ .long sysc_update + 0x80000000
+#endif
cleanup_sysc_return:
mvc __LC_RETURN_PSW(4),0(%r12)
br %r14
cleanup_sysc_leave:
- clc 4(4,%r12),BASED(cleanup_sysc_leave_lpsw)
- be BASED(0f)
+ clc 4(4,%r12),BASED(cleanup_sysc_leave_insn)
+ be BASED(2f)
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+ mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
+ clc 4(4,%r12),BASED(cleanup_sysc_leave_insn+4)
+ be BASED(2f)
+#endif
mvc __LC_RETURN_PSW(8),SP_PSW(%r15)
- mvc __LC_SAVE_AREA+16(16),SP_R12(%r15)
- lm %r0,%r11,SP_R0(%r15)
+ c %r12,BASED(.Lmck_old_psw)
+ bne BASED(0f)
+ mvc __LC_SAVE_AREA+32(16),SP_R12(%r15)
+ b BASED(1f)
+0: mvc __LC_SAVE_AREA+16(16),SP_R12(%r15)
+1: lm %r0,%r11,SP_R0(%r15)
l %r15,SP_R15(%r15)
-0: la %r12,__LC_RETURN_PSW
+2: la %r12,__LC_RETURN_PSW
br %r14
-cleanup_sysc_leave_lpsw:
+cleanup_sysc_leave_insn:
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+ .long sysc_leave + 14 + 0x80000000
+#endif
.long sysc_leave + 10 + 0x80000000
+cleanup_io_return:
+ mvc __LC_RETURN_PSW(4),0(%r12)
+ mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_io_work_loop)
+ la %r12,__LC_RETURN_PSW
+ br %r14
+
+cleanup_io_leave:
+ clc 4(4,%r12),BASED(cleanup_io_leave_insn)
+ be BASED(2f)
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+ mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
+ clc 4(4,%r12),BASED(cleanup_io_leave_insn+4)
+ be BASED(2f)
+#endif
+ mvc __LC_RETURN_PSW(8),SP_PSW(%r15)
+ c %r12,BASED(.Lmck_old_psw)
+ bne BASED(0f)
+ mvc __LC_SAVE_AREA+32(16),SP_R12(%r15)
+ b BASED(1f)
+0: mvc __LC_SAVE_AREA+16(16),SP_R12(%r15)
+1: lm %r0,%r11,SP_R0(%r15)
+ l %r15,SP_R15(%r15)
+2: la %r12,__LC_RETURN_PSW
+ br %r14
+cleanup_io_leave_insn:
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+ .long io_leave + 18 + 0x80000000
+#endif
+ .long io_leave + 14 + 0x80000000
+
/*
* Integer constants
*/
.L0x028: .short 0x028
.L0x030: .short 0x030
.L0x038: .short 0x038
+.Lc_1: .long 1
/*
* Symbol constants
*/
.Ls390_mcck: .long s390_do_machine_check
+.Ls390_handle_mcck:
+ .long s390_handle_mcck
+.Lmck_old_psw: .long __LC_MCK_OLD_PSW
.Ldo_IRQ: .long do_IRQ
.Ldo_extint: .long do_extint
.Ldo_signal: .long do_signal
-.Ldo_softirq: .long do_softirq
.Lhandle_per: .long do_single_step
.Ljump_table: .long pgm_check_table
.Lschedule: .long schedule
.Ltrace: .long syscall_trace
.Lvfork: .long sys_vfork
.Lschedtail: .long schedule_tail
-
+.Lsysc_table: .long sys_call_table
+#ifdef CONFIG_TRACE_IRQFLAGS
+.Ltrace_irq_on:.long trace_hardirqs_on
+.Ltrace_irq_off:
+ .long trace_hardirqs_off
+#endif
.Lcritical_start:
.long __critical_start + 0x80000000
.Lcritical_end:
.Lcleanup_critical:
.long cleanup_critical
+ .section .rodata, "a"
#define SYSCALL(esa,esame,emu) .long esa
- .globl sys_call_table
sys_call_table:
#include "syscalls.S"
#undef SYSCALL
-
git://git.onelab.eu / linux-2.6.git / blobdiff