[S390] add TIF_SYSCALL thread flag
Add an explicit TIF_SYSCALL bit that indicates if a task is inside a system call. The svc_code in the pt_regs structure is now only valid if TIF_SYSCALL is set. With this definition TIF_RESTART_SVC can be replaced with TIF_SYSCALL. Overall do_signal is a bit more readable and it saves a few lines of code. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
parent
ccf45cafb0
commit
b6ef5bb3d9
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@ -26,7 +26,8 @@ extern const unsigned int sys_call_table[];
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static inline long syscall_get_nr(struct task_struct *task,
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struct pt_regs *regs)
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{
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return regs->svc_code ? (regs->svc_code & 0xffff) : -1;
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return test_tsk_thread_flag(task, TIF_SYSCALL) ?
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(regs->svc_code & 0xffff) : -1;
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}
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static inline void syscall_rollback(struct task_struct *task,
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@ -85,10 +85,10 @@ static inline struct thread_info *current_thread_info(void)
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/*
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* thread information flags bit numbers
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*/
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#define TIF_SYSCALL 0 /* inside a system call */
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#define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
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#define TIF_SIGPENDING 2 /* signal pending */
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#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
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#define TIF_RESTART_SVC 4 /* restart svc with new svc number */
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#define TIF_PER_TRAP 6 /* deliver sigtrap on return to user */
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#define TIF_MCCK_PENDING 7 /* machine check handling is pending */
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#define TIF_SYSCALL_TRACE 8 /* syscall trace active */
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@ -104,11 +104,11 @@ static inline struct thread_info *current_thread_info(void)
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#define TIF_SINGLE_STEP 20 /* This task is single stepped */
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#define TIF_FREEZE 21 /* thread is freezing for suspend */
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#define _TIF_SYSCALL (1<<TIF_SYSCALL)
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#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
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#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
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#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
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#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
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#define _TIF_RESTART_SVC (1<<TIF_RESTART_SVC)
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#define _TIF_PER_TRAP (1<<TIF_PER_TRAP)
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#define _TIF_MCCK_PENDING (1<<TIF_MCCK_PENDING)
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#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
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@ -342,7 +342,7 @@ static int restore_sigregs32(struct pt_regs *regs,_sigregs32 __user *sregs)
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return err;
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restore_fp_regs(¤t->thread.fp_regs);
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regs->svc_code = 0; /* disable syscall checks */
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clear_thread_flag(TIF_SYSCALL); /* No longer in a system call */
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return 0;
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}
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@ -47,11 +47,11 @@ SP_SVC_CODE = STACK_FRAME_OVERHEAD + __PT_SVC_CODE
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SP_SIZE = STACK_FRAME_OVERHEAD + __PT_SIZE
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_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
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_TIF_MCCK_PENDING | _TIF_RESTART_SVC | _TIF_PER_TRAP )
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_TIF_MCCK_PENDING | _TIF_PER_TRAP )
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_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
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_TIF_MCCK_PENDING)
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_TIF_SYSCALL = (_TIF_SYSCALL_TRACE>>8 | _TIF_SYSCALL_AUDIT>>8 | \
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_TIF_SECCOMP>>8 | _TIF_SYSCALL_TRACEPOINT>>8)
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_TIF_TRACE = (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \
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_TIF_SYSCALL_TRACEPOINT)
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STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER
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STACK_SIZE = 1 << STACK_SHIFT
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@ -227,9 +227,10 @@ ENTRY(system_call)
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sysc_saveall:
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SAVE_ALL_SVC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
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CREATE_STACK_FRAME __LC_SAVE_AREA
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l %r12,__LC_THREAD_INFO # load pointer to thread_info struct
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mvc SP_PSW(8,%r15),__LC_SVC_OLD_PSW
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mvc SP_SVC_CODE(4,%r15),__LC_SVC_ILC
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l %r12,__LC_THREAD_INFO # load pointer to thread_info struct
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oi __TI_flags+3(%r12),_TIF_SYSCALL
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sysc_vtime:
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UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
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sysc_stime:
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@ -248,7 +249,7 @@ sysc_do_svc:
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sysc_nr_ok:
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sll %r7,2 # svc number *4
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l %r10,BASED(.Lsysc_table)
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tm __TI_flags+2(%r12),_TIF_SYSCALL
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tm __TI_flags+2(%r12),_TIF_TRACE >> 8
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mvc SP_ARGS(4,%r15),SP_R7(%r15)
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l %r8,0(%r7,%r10) # get system call addr.
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bnz BASED(sysc_tracesys)
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@ -258,23 +259,19 @@ sysc_nr_ok:
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sysc_return:
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LOCKDEP_SYS_EXIT
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sysc_tif:
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tm SP_PSW+1(%r15),0x01 # returning to user ?
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bno BASED(sysc_restore)
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tm __TI_flags+3(%r12),_TIF_WORK_SVC
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bnz BASED(sysc_work) # there is work to do (signals etc.)
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ni __TI_flags+3(%r12),255-_TIF_SYSCALL
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sysc_restore:
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RESTORE_ALL __LC_RETURN_PSW,1
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sysc_done:
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#
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# There is work to do, but first we need to check if we return to userspace.
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#
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sysc_work:
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tm SP_PSW+1(%r15),0x01 # returning to user ?
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bno BASED(sysc_restore)
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#
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# One of the work bits is on. Find out which one.
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#
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sysc_work_tif:
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sysc_work:
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tm __TI_flags+3(%r12),_TIF_MCCK_PENDING
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bo BASED(sysc_mcck_pending)
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tm __TI_flags+3(%r12),_TIF_NEED_RESCHED
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@ -283,8 +280,6 @@ sysc_work_tif:
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bo BASED(sysc_sigpending)
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tm __TI_flags+3(%r12),_TIF_NOTIFY_RESUME
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bo BASED(sysc_notify_resume)
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tm __TI_flags+3(%r12),_TIF_RESTART_SVC
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bo BASED(sysc_restart)
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tm __TI_flags+3(%r12),_TIF_PER_TRAP
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bo BASED(sysc_singlestep)
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b BASED(sysc_return) # beware of critical section cleanup
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@ -313,11 +308,14 @@ sysc_sigpending:
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la %r2,SP_PTREGS(%r15) # load pt_regs
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l %r1,BASED(.Ldo_signal)
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basr %r14,%r1 # call do_signal
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tm __TI_flags+3(%r12),_TIF_RESTART_SVC
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bo BASED(sysc_restart)
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tm __TI_flags+3(%r12),_TIF_PER_TRAP
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bo BASED(sysc_singlestep)
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b BASED(sysc_return)
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tm __TI_flags+3(%r12),_TIF_SYSCALL
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bno BASED(sysc_return)
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lm %r2,%r6,SP_R2(%r15) # load svc arguments
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xr %r7,%r7 # svc 0 returns -ENOSYS
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clc SP_SVC_CODE+2(2,%r15),BASED(.Lnr_syscalls+2)
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bnl BASED(sysc_nr_ok) # invalid svc number -> do svc 0
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icm %r7,3,SP_SVC_CODE+2(%r15)# load new svc number
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b BASED(sysc_nr_ok) # restart svc
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#
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# _TIF_NOTIFY_RESUME is set, call do_notify_resume
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@ -328,25 +326,11 @@ sysc_notify_resume:
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la %r14,BASED(sysc_return)
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br %r1 # call do_notify_resume
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#
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# _TIF_RESTART_SVC is set, set up registers and restart svc
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#
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sysc_restart:
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ni __TI_flags+3(%r12),255-_TIF_RESTART_SVC # clear TIF_RESTART_SVC
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lm %r2,%r6,SP_R2(%r15) # load svc arguments
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xr %r7,%r7 # svc 0 returns -ENOSYS
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clc SP_SVC_CODE+2(%r15),BASED(.Lnr_syscalls+2)
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bnl BASED(sysc_nr_ok) # invalid svc number -> do svc 0
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icm %r7,3,SP_SVC_CODE+2(%r15)# load new svc number
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b BASED(sysc_nr_ok) # restart svc
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#
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# _TIF_PER_TRAP is set, call do_per_trap
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#
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sysc_singlestep:
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ni __TI_flags+3(%r12),255-_TIF_PER_TRAP # clear TIF_PER_TRAP
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xc SP_SVC_CODE(4,%r15),SP_SVC_CODE(%r15) # clear svc code
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ni __TI_flags+3(%r12),255-(_TIF_SYSCALL | _TIF_PER_TRAP)
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la %r2,SP_PTREGS(%r15) # address of register-save area
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l %r1,BASED(.Lhandle_per) # load adr. of per handler
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la %r14,BASED(sysc_return) # load adr. of system return
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@ -376,7 +360,7 @@ sysc_tracego:
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basr %r14,%r8 # call sys_xxx
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st %r2,SP_R2(%r15) # store return value
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sysc_tracenogo:
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tm __TI_flags+2(%r12),_TIF_SYSCALL
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tm __TI_flags+2(%r12),_TIF_TRACE >> 8
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bz BASED(sysc_return)
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l %r1,BASED(.Ltrace_exit)
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la %r2,SP_PTREGS(%r15) # load pt_regs
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@ -454,7 +438,6 @@ ENTRY(pgm_check_handler)
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bnz BASED(pgm_per) # got per exception -> special case
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SAVE_ALL_PGM __LC_PGM_OLD_PSW,__LC_SAVE_AREA
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CREATE_STACK_FRAME __LC_SAVE_AREA
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xc SP_SVC_CODE(4,%r15),SP_SVC_CODE(%r15)
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mvc SP_PSW(8,%r15),__LC_PGM_OLD_PSW
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l %r12,__LC_THREAD_INFO # load pointer to thread_info struct
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tm SP_PSW+1(%r15),0x01 # interrupting from user ?
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@ -530,9 +513,10 @@ pgm_exit2:
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pgm_svcper:
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SAVE_ALL_PGM __LC_SVC_OLD_PSW,__LC_SAVE_AREA
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CREATE_STACK_FRAME __LC_SAVE_AREA
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l %r12,__LC_THREAD_INFO # load pointer to thread_info struct
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mvc SP_PSW(8,%r15),__LC_SVC_OLD_PSW
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mvc SP_SVC_CODE(4,%r15),__LC_SVC_ILC
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l %r12,__LC_THREAD_INFO # load pointer to thread_info struct
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oi __TI_flags+3(%r12),(_TIF_SYSCALL | _TIF_PER_TRAP)
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UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
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UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
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mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
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@ -540,7 +524,6 @@ pgm_svcper:
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mvc __THREAD_per_cause(2,%r8),__LC_PER_CAUSE
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mvc __THREAD_per_address(4,%r8),__LC_PER_ADDRESS
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mvc __THREAD_per_paid(1,%r8),__LC_PER_PAID
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oi __TI_flags+3(%r12),_TIF_PER_TRAP # set TIF_PER_TRAP
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stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
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lm %r2,%r6,SP_R2(%r15) # load svc arguments
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b BASED(sysc_do_svc)
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@ -550,7 +533,6 @@ pgm_svcper:
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#
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kernel_per:
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REENABLE_IRQS
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xc SP_SVC_CODE(4,%r15),SP_SVC_CODE(%r15)
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la %r2,SP_PTREGS(%r15) # address of register-save area
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l %r1,BASED(.Lhandle_per) # load adr. of per handler
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basr %r14,%r1 # branch to do_single_step
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@ -965,9 +947,11 @@ cleanup_system_call:
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s %r15,BASED(.Lc_spsize) # make room for registers & psw
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st %r15,12(%r12)
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CREATE_STACK_FRAME __LC_SAVE_AREA
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mvc 0(4,%r12),__LC_THREAD_INFO
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l %r12,__LC_THREAD_INFO
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mvc SP_PSW(8,%r15),__LC_SVC_OLD_PSW
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mvc SP_SVC_CODE(4,%r15),__LC_SVC_ILC
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mvc 0(4,%r12),__LC_THREAD_INFO
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oi __TI_flags+3(%r12),_TIF_SYSCALL
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cleanup_vtime:
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clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+12)
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bhe BASED(cleanup_stime)
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@ -50,11 +50,11 @@ STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER
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STACK_SIZE = 1 << STACK_SHIFT
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_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
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_TIF_MCCK_PENDING | _TIF_RESTART_SVC | _TIF_PER_TRAP )
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_TIF_MCCK_PENDING | _TIF_PER_TRAP )
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_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
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_TIF_MCCK_PENDING)
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_TIF_SYSCALL = (_TIF_SYSCALL_TRACE>>8 | _TIF_SYSCALL_AUDIT>>8 | \
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_TIF_SECCOMP>>8 | _TIF_SYSCALL_TRACEPOINT>>8)
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_TIF_TRACE = (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \
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_TIF_SYSCALL_TRACEPOINT)
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_TIF_EXIT_SIE = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING)
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#define BASED(name) name-system_call(%r13)
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@ -248,9 +248,10 @@ ENTRY(system_call)
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sysc_saveall:
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SAVE_ALL_SVC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
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CREATE_STACK_FRAME __LC_SAVE_AREA
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lg %r12,__LC_THREAD_INFO # load pointer to thread_info struct
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mvc SP_PSW(16,%r15),__LC_SVC_OLD_PSW
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mvc SP_SVC_CODE(4,%r15),__LC_SVC_ILC
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lg %r12,__LC_THREAD_INFO # load pointer to thread_info struct
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oi __TI_flags+7(%r12),_TIF_SYSCALL
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sysc_vtime:
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UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
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sysc_stime:
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@ -276,7 +277,7 @@ sysc_nr_ok:
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larl %r10,sys_call_table_emu # use 31 bit emulation system calls
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sysc_noemu:
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#endif
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tm __TI_flags+6(%r12),_TIF_SYSCALL
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tm __TI_flags+6(%r12),_TIF_TRACE >> 8
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mvc SP_ARGS(8,%r15),SP_R7(%r15)
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lgf %r8,0(%r7,%r10) # load address of system call routine
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jnz sysc_tracesys
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@ -286,23 +287,19 @@ sysc_noemu:
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sysc_return:
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LOCKDEP_SYS_EXIT
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sysc_tif:
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tm SP_PSW+1(%r15),0x01 # returning to user ?
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jno sysc_restore
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tm __TI_flags+7(%r12),_TIF_WORK_SVC
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jnz sysc_work # there is work to do (signals etc.)
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ni __TI_flags+7(%r12),255-_TIF_SYSCALL
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sysc_restore:
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RESTORE_ALL __LC_RETURN_PSW,1
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sysc_done:
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#
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# There is work to do, but first we need to check if we return to userspace.
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#
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sysc_work:
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tm SP_PSW+1(%r15),0x01 # returning to user ?
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jno sysc_restore
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#
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# One of the work bits is on. Find out which one.
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#
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sysc_work_tif:
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sysc_work:
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tm __TI_flags+7(%r12),_TIF_MCCK_PENDING
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jo sysc_mcck_pending
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tm __TI_flags+7(%r12),_TIF_NEED_RESCHED
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@ -311,8 +308,6 @@ sysc_work_tif:
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jo sysc_sigpending
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tm __TI_flags+7(%r12),_TIF_NOTIFY_RESUME
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jo sysc_notify_resume
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tm __TI_flags+7(%r12),_TIF_RESTART_SVC
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jo sysc_restart
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tm __TI_flags+7(%r12),_TIF_PER_TRAP
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jo sysc_singlestep
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j sysc_return # beware of critical section cleanup
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@ -338,11 +333,15 @@ sysc_sigpending:
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ni __TI_flags+7(%r12),255-_TIF_PER_TRAP # clear TIF_PER_TRAP
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la %r2,SP_PTREGS(%r15) # load pt_regs
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brasl %r14,do_signal # call do_signal
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tm __TI_flags+7(%r12),_TIF_RESTART_SVC
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jo sysc_restart
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tm __TI_flags+7(%r12),_TIF_PER_TRAP
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jo sysc_singlestep
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j sysc_return
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tm __TI_flags+7(%r12),_TIF_SYSCALL
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jno sysc_return
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lmg %r2,%r6,SP_R2(%r15) # load svc arguments
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lghi %r7,0 # svc 0 returns -ENOSYS
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lh %r1,SP_SVC_CODE+2(%r15) # load new svc number
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cghi %r1,NR_syscalls
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jnl sysc_nr_ok # invalid svc number -> do svc 0
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slag %r7,%r1,2
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j sysc_nr_ok # restart svc
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#
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# _TIF_NOTIFY_RESUME is set, call do_notify_resume
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@ -352,25 +351,11 @@ sysc_notify_resume:
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larl %r14,sysc_return
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jg do_notify_resume # call do_notify_resume
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#
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# _TIF_RESTART_SVC is set, set up registers and restart svc
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#
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sysc_restart:
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ni __TI_flags+7(%r12),255-_TIF_RESTART_SVC # clear TIF_RESTART_SVC
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lmg %r2,%r6,SP_R2(%r15) # load svc arguments
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lghi %r7,0 # svc 0 returns -ENOSYS
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lh %r1,SP_SVC_CODE+2(%r15) # load new svc number
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cghi %r1,NR_syscalls
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jnl sysc_nr_ok # invalid svc number -> do svc 0
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slag %r7,%r1,2
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j sysc_nr_ok # restart svc
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#
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# _TIF_PER_TRAP is set, call do_per_trap
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||||
#
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||||
sysc_singlestep:
|
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ni __TI_flags+7(%r12),255-_TIF_PER_TRAP # clear TIF_PER_TRAP
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xc SP_SVC_CODE(4,%r15),SP_SVC_CODE(%r15) # clear svc code
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||||
ni __TI_flags+7(%r12),255-(_TIF_SYSCALL | _TIF_PER_TRAP)
|
||||
la %r2,SP_PTREGS(%r15) # address of register-save area
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||||
larl %r14,sysc_return # load adr. of system return
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||||
jg do_per_trap
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||||
|
@ -397,7 +382,7 @@ sysc_tracego:
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|||
basr %r14,%r8 # call sys_xxx
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||||
stg %r2,SP_R2(%r15) # store return value
|
||||
sysc_tracenogo:
|
||||
tm __TI_flags+6(%r12),_TIF_SYSCALL
|
||||
tm __TI_flags+6(%r12),_TIF_TRACE >> 8
|
||||
jz sysc_return
|
||||
la %r2,SP_PTREGS(%r15) # load pt_regs
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||||
larl %r14,sysc_return # return point is sysc_return
|
||||
|
@ -470,7 +455,6 @@ ENTRY(pgm_check_handler)
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|||
jnz pgm_per # got per exception -> special case
|
||||
SAVE_ALL_PGM __LC_PGM_OLD_PSW,__LC_SAVE_AREA
|
||||
CREATE_STACK_FRAME __LC_SAVE_AREA
|
||||
xc SP_SVC_CODE(4,%r15),SP_SVC_CODE(%r15)
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||||
mvc SP_PSW(16,%r15),__LC_PGM_OLD_PSW
|
||||
lg %r12,__LC_THREAD_INFO # load pointer to thread_info struct
|
||||
HANDLE_SIE_INTERCEPT
|
||||
|
@ -550,9 +534,10 @@ pgm_exit2:
|
|||
pgm_svcper:
|
||||
SAVE_ALL_PGM __LC_SVC_OLD_PSW,__LC_SAVE_AREA
|
||||
CREATE_STACK_FRAME __LC_SAVE_AREA
|
||||
lg %r12,__LC_THREAD_INFO # load pointer to thread_info struct
|
||||
mvc SP_PSW(16,%r15),__LC_SVC_OLD_PSW
|
||||
mvc SP_SVC_CODE(4,%r15),__LC_SVC_ILC
|
||||
lg %r12,__LC_THREAD_INFO # load pointer to thread_info struct
|
||||
oi __TI_flags+7(%r12),(_TIF_SYSCALL | _TIF_PER_TRAP)
|
||||
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
|
||||
|
@ -561,7 +546,6 @@ pgm_svcper:
|
|||
mvc __THREAD_per_cause(2,%r8),__LC_PER_CAUSE
|
||||
mvc __THREAD_per_address(8,%r8),__LC_PER_ADDRESS
|
||||
mvc __THREAD_per_paid(1,%r8),__LC_PER_PAID
|
||||
oi __TI_flags+7(%r12),_TIF_PER_TRAP # set TIF_PER_TRAP
|
||||
stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
|
||||
lmg %r2,%r6,SP_R2(%r15) # load svc arguments
|
||||
j sysc_do_svc
|
||||
|
@ -571,7 +555,6 @@ pgm_svcper:
|
|||
#
|
||||
kernel_per:
|
||||
REENABLE_IRQS
|
||||
xc SP_SVC_CODE(4,%r15),SP_SVC_CODE(%r15) # clear svc number
|
||||
la %r2,SP_PTREGS(%r15) # address of register-save area
|
||||
brasl %r14,do_per_trap
|
||||
j pgm_exit
|
||||
|
@ -972,9 +955,11 @@ cleanup_system_call:
|
|||
stg %r15,32(%r12)
|
||||
stg %r11,0(%r12)
|
||||
CREATE_STACK_FRAME __LC_SAVE_AREA
|
||||
mvc 8(8,%r12),__LC_THREAD_INFO
|
||||
lg %r12,__LC_THREAD_INFO
|
||||
mvc SP_PSW(16,%r15),__LC_SVC_OLD_PSW
|
||||
mvc SP_SVC_CODE(4,%r15),__LC_SVC_ILC
|
||||
mvc 8(8,%r12),__LC_THREAD_INFO
|
||||
oi __TI_flags+7(%r12),_TIF_SYSCALL
|
||||
cleanup_vtime:
|
||||
clc __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+24)
|
||||
jhe cleanup_stime
|
||||
|
|
|
@ -750,7 +750,7 @@ asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
|
|||
* debugger stored an invalid system call number. Skip
|
||||
* the system call and the system call restart handling.
|
||||
*/
|
||||
regs->svc_code = 0;
|
||||
clear_thread_flag(TIF_SYSCALL);
|
||||
ret = -1;
|
||||
}
|
||||
|
||||
|
|
|
@ -157,7 +157,7 @@ static int restore_sigregs(struct pt_regs *regs, _sigregs __user *sregs)
|
|||
current->thread.fp_regs.fpc &= FPC_VALID_MASK;
|
||||
|
||||
restore_fp_regs(¤t->thread.fp_regs);
|
||||
regs->svc_code = 0; /* disable syscall checks */
|
||||
clear_thread_flag(TIF_SYSCALL); /* No longer in a system call */
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
@ -426,13 +426,14 @@ void do_signal(struct pt_regs *regs)
|
|||
* the debugger may change all our registers, including the system
|
||||
* call information.
|
||||
*/
|
||||
current_thread_info()->system_call = regs->svc_code;
|
||||
current_thread_info()->system_call =
|
||||
test_thread_flag(TIF_SYSCALL) ? regs->svc_code : 0;
|
||||
signr = get_signal_to_deliver(&info, &ka, regs, NULL);
|
||||
regs->svc_code = current_thread_info()->system_call;
|
||||
|
||||
if (signr > 0) {
|
||||
/* Whee! Actually deliver the signal. */
|
||||
if (regs->svc_code > 0) {
|
||||
if (current_thread_info()->system_call) {
|
||||
regs->svc_code = current_thread_info()->system_call;
|
||||
/* Check for system call restarting. */
|
||||
switch (regs->gprs[2]) {
|
||||
case -ERESTART_RESTARTBLOCK:
|
||||
|
@ -453,7 +454,7 @@ void do_signal(struct pt_regs *regs)
|
|||
break;
|
||||
}
|
||||
/* No longer in a system call */
|
||||
regs->svc_code = 0;
|
||||
clear_thread_flag(TIF_SYSCALL);
|
||||
}
|
||||
|
||||
if ((is_compat_task() ?
|
||||
|
@ -478,7 +479,8 @@ void do_signal(struct pt_regs *regs)
|
|||
}
|
||||
|
||||
/* No handlers present - check for system call restart */
|
||||
if (regs->svc_code > 0) {
|
||||
if (current_thread_info()->system_call) {
|
||||
regs->svc_code = current_thread_info()->system_call;
|
||||
switch (regs->gprs[2]) {
|
||||
case -ERESTART_RESTARTBLOCK:
|
||||
/* Restart with sys_restart_syscall */
|
||||
|
@ -489,7 +491,10 @@ void do_signal(struct pt_regs *regs)
|
|||
case -ERESTARTNOINTR:
|
||||
/* Restart system call with magic TIF bit. */
|
||||
regs->gprs[2] = regs->orig_gpr2;
|
||||
set_thread_flag(TIF_RESTART_SVC);
|
||||
set_thread_flag(TIF_SYSCALL);
|
||||
break;
|
||||
default:
|
||||
clear_thread_flag(TIF_SYSCALL);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
|
Loading…
Reference in New Issue