diff options
Diffstat (limited to 'arch/s390/kernel/entry.S')
| -rw-r--r-- | arch/s390/kernel/entry.S | 84 |
1 files changed, 34 insertions, 50 deletions
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S index 02ec8fe7d03..b13157057e0 100644 --- a/arch/s390/kernel/entry.S +++ b/arch/s390/kernel/entry.S @@ -43,16 +43,15 @@ SP_R13 = STACK_FRAME_OVERHEAD + __PT_GPRS + 52 SP_R14 = STACK_FRAME_OVERHEAD + __PT_GPRS + 56 SP_R15 = STACK_FRAME_OVERHEAD + __PT_GPRS + 60 SP_ORIG_R2 = STACK_FRAME_OVERHEAD + __PT_ORIG_GPR2 -SP_ILC = STACK_FRAME_OVERHEAD + __PT_ILC -SP_SVCNR = STACK_FRAME_OVERHEAD + __PT_SVCNR +SP_SVC_CODE = STACK_FRAME_OVERHEAD + __PT_SVC_CODE SP_SIZE = STACK_FRAME_OVERHEAD + __PT_SIZE _TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ - _TIF_MCCK_PENDING | _TIF_RESTART_SVC | _TIF_PER_TRAP ) + _TIF_MCCK_PENDING | _TIF_PER_TRAP ) _TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ _TIF_MCCK_PENDING) -_TIF_SYSCALL = (_TIF_SYSCALL_TRACE>>8 | _TIF_SYSCALL_AUDIT>>8 | \ - _TIF_SECCOMP>>8 | _TIF_SYSCALL_TRACEPOINT>>8) +_TIF_TRACE = (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \ + _TIF_SYSCALL_TRACEPOINT) STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER STACK_SIZE = 1 << STACK_SHIFT @@ -228,9 +227,10 @@ ENTRY(system_call) sysc_saveall: SAVE_ALL_SVC __LC_SVC_OLD_PSW,__LC_SAVE_AREA CREATE_STACK_FRAME __LC_SAVE_AREA - mvc SP_PSW(8,%r15),__LC_SVC_OLD_PSW - mvc SP_ILC(4,%r15),__LC_SVC_ILC l %r12,__LC_THREAD_INFO # load pointer to thread_info struct + mvc SP_PSW(8,%r15),__LC_SVC_OLD_PSW + mvc SP_SVC_CODE(4,%r15),__LC_SVC_ILC + oi __TI_flags+3(%r12),_TIF_SYSCALL sysc_vtime: UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER sysc_stime: @@ -239,17 +239,17 @@ sysc_update: mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER sysc_do_svc: xr %r7,%r7 - icm %r7,3,SP_SVCNR(%r15) # load svc number and test for svc 0 + icm %r7,3,SP_SVC_CODE+2(%r15)# load svc number and test for svc 0 bnz BASED(sysc_nr_ok) # svc number > 0 # svc 0: system call number in %r1 cl %r1,BASED(.Lnr_syscalls) bnl BASED(sysc_nr_ok) - sth %r1,SP_SVCNR(%r15) + sth %r1,SP_SVC_CODE+2(%r15) lr %r7,%r1 # copy svc number to %r7 sysc_nr_ok: sll %r7,2 # svc number *4 l %r10,BASED(.Lsysc_table) - tm __TI_flags+2(%r12),_TIF_SYSCALL + tm __TI_flags+2(%r12),_TIF_TRACE >> 8 mvc SP_ARGS(4,%r15),SP_R7(%r15) l %r8,0(%r7,%r10) # get system call addr. bnz BASED(sysc_tracesys) @@ -259,23 +259,19 @@ sysc_nr_ok: sysc_return: LOCKDEP_SYS_EXIT sysc_tif: + tm SP_PSW+1(%r15),0x01 # returning to user ? + bno BASED(sysc_restore) tm __TI_flags+3(%r12),_TIF_WORK_SVC bnz BASED(sysc_work) # there is work to do (signals etc.) + ni __TI_flags+3(%r12),255-_TIF_SYSCALL sysc_restore: RESTORE_ALL __LC_RETURN_PSW,1 sysc_done: # -# There is work to do, but first we need to check if we return to userspace. -# -sysc_work: - tm SP_PSW+1(%r15),0x01 # returning to user ? - bno BASED(sysc_restore) - -# # One of the work bits is on. Find out which one. # -sysc_work_tif: +sysc_work: tm __TI_flags+3(%r12),_TIF_MCCK_PENDING bo BASED(sysc_mcck_pending) tm __TI_flags+3(%r12),_TIF_NEED_RESCHED @@ -284,8 +280,6 @@ sysc_work_tif: bo BASED(sysc_sigpending) tm __TI_flags+3(%r12),_TIF_NOTIFY_RESUME bo BASED(sysc_notify_resume) - tm __TI_flags+3(%r12),_TIF_RESTART_SVC - bo BASED(sysc_restart) tm __TI_flags+3(%r12),_TIF_PER_TRAP bo BASED(sysc_singlestep) b BASED(sysc_return) # beware of critical section cleanup @@ -314,11 +308,14 @@ sysc_sigpending: la %r2,SP_PTREGS(%r15) # load pt_regs l %r1,BASED(.Ldo_signal) basr %r14,%r1 # call do_signal - tm __TI_flags+3(%r12),_TIF_RESTART_SVC - bo BASED(sysc_restart) - tm __TI_flags+3(%r12),_TIF_PER_TRAP - bo BASED(sysc_singlestep) - b BASED(sysc_return) + tm __TI_flags+3(%r12),_TIF_SYSCALL + bno BASED(sysc_return) + lm %r2,%r6,SP_R2(%r15) # load svc arguments + xr %r7,%r7 # svc 0 returns -ENOSYS + clc SP_SVC_CODE+2(2,%r15),BASED(.Lnr_syscalls+2) + bnl BASED(sysc_nr_ok) # invalid svc number -> do svc 0 + icm %r7,3,SP_SVC_CODE+2(%r15)# load new svc number + b BASED(sysc_nr_ok) # restart svc # # _TIF_NOTIFY_RESUME is set, call do_notify_resume @@ -329,24 +326,11 @@ sysc_notify_resume: la %r14,BASED(sysc_return) br %r1 # call do_notify_resume - -# -# _TIF_RESTART_SVC is set, set up registers and restart svc -# -sysc_restart: - ni __TI_flags+3(%r12),255-_TIF_RESTART_SVC # clear TIF_RESTART_SVC - l %r7,SP_R2(%r15) # load new svc number - mvc SP_R2(4,%r15),SP_ORIG_R2(%r15) # restore first argument - lm %r2,%r6,SP_R2(%r15) # load svc arguments - sth %r7,SP_SVCNR(%r15) - b BASED(sysc_nr_ok) # restart svc - # # _TIF_PER_TRAP is set, call do_per_trap # sysc_singlestep: - ni __TI_flags+3(%r12),255-_TIF_PER_TRAP # clear TIF_PER_TRAP - xc SP_SVCNR(2,%r15),SP_SVCNR(%r15) # clear svc number + ni __TI_flags+3(%r12),255-(_TIF_SYSCALL | _TIF_PER_TRAP) la %r2,SP_PTREGS(%r15) # address of register-save area l %r1,BASED(.Lhandle_per) # load adr. of per handler la %r14,BASED(sysc_return) # load adr. of system return @@ -361,7 +345,7 @@ sysc_tracesys: la %r2,SP_PTREGS(%r15) # load pt_regs la %r3,0 xr %r0,%r0 - icm %r0,3,SP_SVCNR(%r15) + icm %r0,3,SP_SVC_CODE(%r15) st %r0,SP_R2(%r15) basr %r14,%r1 cl %r2,BASED(.Lnr_syscalls) @@ -376,7 +360,7 @@ sysc_tracego: basr %r14,%r8 # call sys_xxx st %r2,SP_R2(%r15) # store return value sysc_tracenogo: - tm __TI_flags+2(%r12),_TIF_SYSCALL + tm __TI_flags+2(%r12),_TIF_TRACE >> 8 bz BASED(sysc_return) l %r1,BASED(.Ltrace_exit) la %r2,SP_PTREGS(%r15) # load pt_regs @@ -454,7 +438,6 @@ ENTRY(pgm_check_handler) bnz BASED(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_ILC(4,%r15),SP_ILC(%r15) mvc SP_PSW(8,%r15),__LC_PGM_OLD_PSW l %r12,__LC_THREAD_INFO # load pointer to thread_info struct tm SP_PSW+1(%r15),0x01 # interrupting from user ? @@ -530,9 +513,10 @@ pgm_exit2: pgm_svcper: SAVE_ALL_PGM __LC_SVC_OLD_PSW,__LC_SAVE_AREA CREATE_STACK_FRAME __LC_SAVE_AREA - mvc SP_PSW(8,%r15),__LC_SVC_OLD_PSW - mvc SP_ILC(4,%r15),__LC_SVC_ILC l %r12,__LC_THREAD_INFO # load pointer to thread_info struct + mvc SP_PSW(8,%r15),__LC_SVC_OLD_PSW + mvc SP_SVC_CODE(4,%r15),__LC_SVC_ILC + oi __TI_flags+3(%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 @@ -540,7 +524,6 @@ pgm_svcper: mvc __THREAD_per_cause(2,%r8),__LC_PER_CAUSE mvc __THREAD_per_address(4,%r8),__LC_PER_ADDRESS mvc __THREAD_per_paid(1,%r8),__LC_PER_PAID - oi __TI_flags+3(%r12),_TIF_PER_TRAP # set TIF_PER_TRAP stosm __SF_EMPTY(%r15),0x03 # reenable interrupts lm %r2,%r6,SP_R2(%r15) # load svc arguments b BASED(sysc_do_svc) @@ -550,7 +533,6 @@ pgm_svcper: # kernel_per: REENABLE_IRQS - xc SP_SVCNR(2,%r15),SP_SVCNR(%r15) la %r2,SP_PTREGS(%r15) # address of register-save area l %r1,BASED(.Lhandle_per) # load adr. of per handler basr %r14,%r1 # branch to do_single_step @@ -853,13 +835,13 @@ restart_go: # PSW restart interrupt handler # ENTRY(psw_restart_int_handler) - st %r15,__LC_SAVE_AREA_64(%r0) # save r15 + st %r15,__LC_SAVE_AREA+48(%r0) # save r15 basr %r15,0 0: l %r15,.Lrestart_stack-0b(%r15) # load restart stack l %r15,0(%r15) ahi %r15,-SP_SIZE # make room for pt_regs stm %r0,%r14,SP_R0(%r15) # store gprs %r0-%r14 to stack - mvc SP_R15(4,%r15),__LC_SAVE_AREA_64(%r0)# store saved %r15 to stack + mvc SP_R15(4,%r15),__LC_SAVE_AREA+48(%r0)# store saved %r15 to stack mvc SP_PSW(8,%r15),__LC_RST_OLD_PSW(%r0) # store restart old psw xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # set backchain to 0 basr %r14,0 @@ -965,9 +947,11 @@ cleanup_system_call: s %r15,BASED(.Lc_spsize) # make room for registers & psw st %r15,12(%r12) CREATE_STACK_FRAME __LC_SAVE_AREA - mvc SP_PSW(8,%r15),__LC_SVC_OLD_PSW - mvc SP_ILC(4,%r15),__LC_SVC_ILC mvc 0(4,%r12),__LC_THREAD_INFO + l %r12,__LC_THREAD_INFO + mvc SP_PSW(8,%r15),__LC_SVC_OLD_PSW + mvc SP_SVC_CODE(4,%r15),__LC_SVC_ILC + oi __TI_flags+3(%r12),_TIF_SYSCALL cleanup_vtime: clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+12) bhe BASED(cleanup_stime) |