* Stack layout for the system_call stack entry.
* The first few entries are identical to the user_regs_struct.
*/
-SP_PTREGS = STACK_FRAME_OVERHEAD
+SP_PTREGS = STACK_FRAME_OVERHEAD
+SP_ARGS = STACK_FRAME_OVERHEAD + __PT_ARGS
SP_PSW = STACK_FRAME_OVERHEAD + __PT_PSW
SP_R0 = STACK_FRAME_OVERHEAD + __PT_GPRS
SP_R1 = STACK_FRAME_OVERHEAD + __PT_GPRS + 8
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_WORK_SVC = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
+ _TIF_RESTART_SVC | _TIF_SINGLE_STEP )
_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NEED_RESCHED)
/*
llgh %r7,__LC_SVC_INT_CODE # get svc number from lowcore
sysc_enter:
GET_THREAD_INFO # load pointer to task_struct to R9
+sysc_do_svc:
slag %r7,%r7,2 # *4 and test for svc 0
- jnz sysc_do_restart
+ jnz sysc_nr_ok
# svc 0: system call number in %r1
lghi %r0,NR_syscalls
clr %r1,%r0
- jnl sysc_do_restart
+ jnl sysc_nr_ok
lgfr %r7,%r1 # clear high word in r1
slag %r7,%r7,2 # svc 0: system call number in %r1
+sysc_nr_ok:
+ mvc SP_ARGS(8,%r15),SP_R7(%r15)
sysc_do_restart:
larl %r10,sys_call_table
#ifdef CONFIG_S390_SUPPORT
#endif
tm __TI_flags+7(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
lgf %r8,0(%r7,%r10) # load address of system call routine
- jo sysc_tracesys
+ jnz sysc_tracesys
basr %r14,%r8 # call sys_xxxx
stg %r2,SP_R2(%r15) # store return value (change R2 on stack)
# ATTENTION: check sys_execve_glue before
jz sysc_leave # there is no work to do
#
# One of the work bits is on. Find out which one.
-# Checked are: _TIF_SIGPENDING and _TIF_NEED_RESCHED
#
sysc_work:
tm __TI_flags+7(%r9),_TIF_NEED_RESCHED
jo sysc_sigpending
tm __TI_flags+7(%r9),_TIF_RESTART_SVC
jo sysc_restart
+ tm __TI_flags+7(%r9),_TIF_SINGLE_STEP
+ jo sysc_singlestep
j sysc_leave
#
lmg %r2,%r6,SP_R2(%r15) # load svc arguments
j sysc_do_restart # restart svc
+#
+# _TIF_SINGLE_STEP is set, call do_debugger_trap
+#
+sysc_singlestep:
+ ni __TI_flags+7(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
+ mvi SP_TRAP+1(%r15),0x28 # set trap indication to pgm check
+ la %r2,SP_PTREGS(%r15) # address of register-save area
+ larl %r14,sysc_return # load adr. of system return
+ jg do_debugger_trap # branch to do_debugger_trap
+
+
__critical_end:
#
stg %r2,SP_R2(%r15) # store return value
sysc_tracenogo:
tm __TI_flags+7(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
- jno sysc_return
+ jz sysc_return
la %r2,SP_PTREGS(%r15) # load pt_regs
la %r3,1
larl %r14,sysc_return # return point is sysc_return
pgm_per_std:
SAVE_ALL __LC_PGM_OLD_PSW,__LC_SAVE_AREA,1
GET_THREAD_INFO
- mvc __THREAD_per+__PER_atmid(2,%r9),__LC_PER_ATMID
- mvc __THREAD_per+__PER_address(8,%r9),__LC_PER_ADDRESS
- mvc __THREAD_per+__PER_access_id(1,%r9),__LC_PER_ACCESS_ID
+ lg %r1,__TI_task(%r9)
+ mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID
+ mvc __THREAD_per+__PER_address(8,%r1),__LC_PER_ADDRESS
+ mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID
lghi %r4,0x7f
lgf %r3,__LC_PGM_ILC # load program interruption code
nr %r4,%r3 # clear per-event-bit and ilc
#
pgm_svcper:
SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1
- llgh %r7,__LC_SVC_INT_CODE # get svc number from lowcore
- stosm 48(%r15),0x03 # reenable interrupts
- GET_THREAD_INFO # load pointer to task_struct to R9
- mvc __THREAD_per+__PER_atmid(2,%r9),__LC_PER_ATMID
- mvc __THREAD_per+__PER_address(8,%r9),__LC_PER_ADDRESS
- mvc __THREAD_per+__PER_access_id(1,%r9),__LC_PER_ACCESS_ID
- slag %r7,%r7,2 # *4 and test for svc 0
- jnz pgm_svcstd
- # svc 0: system call number in %r1
- lghi %r0,NR_syscalls
- clr %r1,%r0
- slag %r7,%r1,2
-pgm_svcstd:
- larl %r10,sys_call_table
-#ifdef CONFIG_S390_SUPPORT
- tm SP_PSW+3(%r15),0x01 # are we running in 31 bit mode ?
- jo pgm_svcper_noemu
- larl %r10,sys_call_table_emu # use 31 bit emulation system calls
-pgm_svcper_noemu:
-#endif
- tm __TI_flags+7(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
- lgf %r8,0(%r7,%r10) # load address of system call routine
- jo pgm_tracesys
- basr %r14,%r8 # call sys_xxxx
- stg %r2,SP_R2(%r15) # store return value (change R2 on stack)
- # ATTENTION: check sys_execve_glue before
- # changing anything here !!
-
-pgm_svcret:
- tm __TI_flags+7(%r9),_TIF_SIGPENDING
- jno pgm_svcper_nosig
- la %r2,SP_PTREGS(%r15) # load pt_regs
- sgr %r3,%r3 # clear *oldset
- brasl %r14,do_signal
-
-pgm_svcper_nosig:
- lhi %r0,__LC_PGM_OLD_PSW # set trap indication back to pgm_chk
- st %r0,SP_TRAP(%r15)
- la %r2,SP_PTREGS(15) # address of register-save area
- larl %r14,sysc_return # load adr. of system return
- jg do_debugger_trap
-#
-# call trace before and after sys_call
-#
-pgm_tracesys:
- la %r2,SP_PTREGS(%r15) # load pt_regs
- la %r3,0
- srlg %r7,%r7,2
- stg %r7,SP_R2(%r15)
- brasl %r14,syscall_trace
- lghi %r0,NR_syscalls
- clg %r0,SP_R2(%r15)
- jnh pgm_svc_nogo
- lg %r7,SP_R2(%r15)
- sllg %r7,%r7,2 # strace wants to change the syscall
- lgf %r8,0(%r7,%r10)
-pgm_svc_go:
- lmg %r3,%r6,SP_R3(%r15)
- lg %r2,SP_ORIG_R2(%r15)
- basr %r14,%r8 # call sys_xxx
- stg %r2,SP_R2(%r15) # store return value
-pgm_svc_nogo:
- tm __TI_flags+7(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
- jno pgm_svcret
- la %r2,SP_PTREGS(%r15) # load pt_regs
- la %r3,1
- larl %r14,pgm_svcret # return point is sysc_return
- jg syscall_trace
+ llgh %r7,__LC_SVC_INT_CODE # get svc number from lowcore
+ GET_THREAD_INFO # load pointer to task_struct to R9
+ lg %r1,__TI_task(%r9)
+ mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID
+ mvc __THREAD_per+__PER_address(8,%r1),__LC_PER_ADDRESS
+ mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID
+ oi __TI_flags+7(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP
+ stosm 48(%r15),0x03 # reenable interrupts
+ j sysc_do_svc
/*
* IO interrupt handler routine
git://git.onelab.eu / linux-2.6.git / blobdiff