STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER
STACK_SIZE = 1 << STACK_SHIFT
-_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
+_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
_TIF_MCCK_PENDING | _TIF_RESTART_SVC | _TIF_SINGLE_STEP )
-_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
+_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
_TIF_MCCK_PENDING)
#define BASED(name) name-system_call(%r13)
stg %r2,SP_R2(%r15) # store return value (change R2 on stack)
sysc_return:
- tm SP_PSW+1(%r15),0x01 # returning to user ?
- jno sysc_restore
tm __TI_flags+7(%r9),_TIF_WORK_SVC
jnz sysc_work # there is work to do (signals etc.)
sysc_restore:
# One of the work bits is on. Find out which one.
#
sysc_work:
+ tm SP_PSW+1(%r15),0x01 # returning to user ?
+ jno sysc_restore
tm __TI_flags+7(%r9),_TIF_MCCK_PENDING
jo sysc_mcck_pending
tm __TI_flags+7(%r9),_TIF_NEED_RESCHED
jo sysc_reschedule
tm __TI_flags+7(%r9),_TIF_SIGPENDING
jnz sysc_sigpending
+ tm __TI_flags+7(%r9),_TIF_NOTIFY_RESUME
+ jnz sysc_notify_resume
tm __TI_flags+7(%r9),_TIF_RESTART_SVC
jo sysc_restart
tm __TI_flags+7(%r9),_TIF_SINGLE_STEP
jo sysc_singlestep
j sysc_work_loop
+#
+# _TIF_NOTIFY_RESUME is set, call do_notify_resume
+#
+sysc_notify_resume:
+ la %r2,SP_PTREGS(%r15) # load pt_regs
+ larl %r14,sysc_work_loop
+ jg do_notify_resume # call do_notify_resume
+
#
# _TIF_RESTART_SVC is set, set up registers and restart svc
#
jg do_single_step # branch to do_sigtrap
#
-# call syscall_trace before and after system call
-# special linkage: %r12 contains the return address for trace_svc
+# call tracehook_report_syscall_entry/tracehook_report_syscall_exit before
+# and after the system call
#
sysc_tracesys:
la %r2,SP_PTREGS(%r15) # load pt_regs
la %r3,0
srl %r7,2
stg %r7,SP_R2(%r15)
- brasl %r14,syscall_trace
+ brasl %r14,do_syscall_trace_enter
lghi %r0,NR_syscalls
- clg %r0,SP_R2(%r15)
+ clgr %r0,%r2
jnh sysc_tracenogo
- lg %r7,SP_R2(%r15) # strace might have changed the
- sll %r7,2 # system call
+ slag %r7,%r2,2 # *4
lgf %r8,0(%r7,%r10)
sysc_tracego:
lmg %r3,%r6,SP_R3(%r15)
tm __TI_flags+7(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
jz sysc_return
la %r2,SP_PTREGS(%r15) # load pt_regs
- la %r3,1
larl %r14,sysc_return # return point is sysc_return
- jg syscall_trace
+ jg do_syscall_trace_exit
#
# a new process exits the kernel with ret_from_fork
la %r2,SP_PTREGS(%r15) # address of register-save area
brasl %r14,do_IRQ # call standard irq handler
io_return:
- tm SP_PSW+1(%r15),0x01 # returning to user ?
-#ifdef CONFIG_PREEMPT
- jno io_preempt # no -> check for preemptive scheduling
-#else
- jno io_restore # no-> skip resched & signal
-#endif
tm __TI_flags+7(%r9),_TIF_WORK_INT
jnz io_work # there is work to do (signals etc.)
io_restore:
.quad 0, io_restore_trace
#endif
-#ifdef CONFIG_PREEMPT
-io_preempt:
+#
+# There is work todo, we need to check if we return to userspace, then
+# check, if we are in SIE, if yes leave it
+#
+io_work:
+ tm SP_PSW+1(%r15),0x01 # returning to user ?
+#ifndef CONFIG_PREEMPT
+#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE)
+ jnz io_work_user # yes -> no need to check for SIE
+ la %r1, BASED(sie_opcode) # we return to kernel here
+ lg %r2, SP_PSW+8(%r15)
+ clc 0(2,%r1), 0(%r2) # is current instruction = SIE?
+ jne io_restore # no-> return to kernel
+ lg %r1, SP_PSW+8(%r15) # yes-> add 4 bytes to leave SIE
+ aghi %r1, 4
+ stg %r1, SP_PSW+8(%r15)
+ j io_restore # return to kernel
+#else
+ jno io_restore # no-> skip resched & signal
+#endif
+#else
+ jnz io_work_user # yes -> do resched & signal
+#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE)
+ la %r1, BASED(sie_opcode)
+ lg %r2, SP_PSW+8(%r15)
+ clc 0(2,%r1), 0(%r2) # is current instruction = SIE?
+ jne 0f # no -> leave PSW alone
+ lg %r1, SP_PSW+8(%r15) # yes-> add 4 bytes to leave SIE
+ aghi %r1, 4
+ stg %r1, SP_PSW+8(%r15)
+0:
+#endif
+ # check for preemptive scheduling
icm %r0,15,__TI_precount(%r9)
- jnz io_restore
+ jnz io_restore # preemption is disabled
# switch to kernel stack
lg %r1,SP_R15(%r15)
aghi %r1,-SP_SIZE
jg preempt_schedule_irq
#endif
-#
-# switch to kernel stack, then check TIF bits
-#
-io_work:
+io_work_user:
lg %r1,__LC_KERNEL_STACK
aghi %r1,-SP_SIZE
mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
jo io_reschedule
tm __TI_flags+7(%r9),_TIF_SIGPENDING
jnz io_sigpending
+ tm __TI_flags+7(%r9),_TIF_NOTIFY_RESUME
+ jnz io_notify_resume
j io_restore
io_work_done:
+#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE)
+sie_opcode:
+ .long 0xb2140000
+#endif
+
#
# _TIF_MCCK_PENDING is set, call handler
#
TRACE_IRQS_OFF
j io_work_loop
+#
+# _TIF_NOTIFY_RESUME or is set, call do_notify_resume
+#
+io_notify_resume:
+ TRACE_IRQS_ON
+ stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
+ la %r2,SP_PTREGS(%r15) # load pt_regs
+ brasl %r14,do_notify_resume # call do_notify_resume
+ stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts
+ TRACE_IRQS_OFF
+ j io_work_loop
+
/*
* External interrupt handler routine
*/