/* * arch/s390/kernel/entry.S * S390 low-level entry points. * * S390 version * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation * 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), */ #include #include #include #include #include #include #include #include #include #include /* * 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_PSW = STACK_FRAME_OVERHEAD + __PT_PSW SP_R0 = STACK_FRAME_OVERHEAD + __PT_GPRS SP_R1 = STACK_FRAME_OVERHEAD + __PT_GPRS + 4 SP_R2 = STACK_FRAME_OVERHEAD + __PT_GPRS + 8 SP_R3 = STACK_FRAME_OVERHEAD + __PT_GPRS + 12 SP_R4 = STACK_FRAME_OVERHEAD + __PT_GPRS + 16 SP_R5 = STACK_FRAME_OVERHEAD + __PT_GPRS + 20 SP_R6 = STACK_FRAME_OVERHEAD + __PT_GPRS + 24 SP_R7 = STACK_FRAME_OVERHEAD + __PT_GPRS + 28 SP_R8 = STACK_FRAME_OVERHEAD + __PT_GPRS + 32 SP_R9 = STACK_FRAME_OVERHEAD + __PT_GPRS + 36 SP_R10 = STACK_FRAME_OVERHEAD + __PT_GPRS + 40 SP_R11 = STACK_FRAME_OVERHEAD + __PT_GPRS + 44 SP_R12 = STACK_FRAME_OVERHEAD + __PT_GPRS + 48 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_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_INT = (_TIF_SIGPENDING | _TIF_NEED_RESCHED) #define BASED(name) name-system_call(%r13) /* * Register usage in interrupt handlers: * R9 - pointer to current task structure * R13 - pointer to literal pool * R14 - return register for function calls * R15 - kernel stack pointer */ .macro SAVE_ALL_BASE psworg,savearea,sync stm %r12,%r15,\savearea l %r13,__LC_SVC_NEW_PSW+4 # load &system_call to %r13 .endm .macro CLEANUP_SAVE_ALL_BASE psworg,savearea,sync l %r1,SP_PSW+4(%r15) cli 1(%r1),0xcf jne 0f mvc \savearea(16),SP_R12(%r15) 0: st %r13,SP_R13(%r15) .endm .macro SAVE_ALL psworg,savearea,sync .if \sync tm \psworg+1,0x01 # test problem state bit bz BASED(1f) # skip stack setup save l %r15,__LC_KERNEL_STACK # problem state -> load ksp .else tm \psworg+1,0x01 # test problem state bit bnz BASED(0f) # from user -> load async stack l %r14,__LC_ASYNC_STACK # are we already on the async stack ? slr %r14,%r15 sra %r14,13 be BASED(1f) 0: l %r15,__LC_ASYNC_STACK .endif 1: s %r15,BASED(.Lc_spsize) # make room for registers & psw l %r14,BASED(.L\psworg) slr %r12,%r12 icm %r14,12,__LC_SVC_ILC stm %r0,%r11,SP_R0(%r15) # store gprs 0-12 to kernel stack st %r2,SP_ORIG_R2(%r15) # store original content of gpr 2 mvc SP_R12(16,%r15),\savearea # move R13-R15 to stack mvc SP_PSW(8,%r15),\psworg # move user PSW to stack st %r14,SP_ILC(%r15) st %r12,0(%r15) # clear back chain .endm .macro CLEANUP_SAVE_ALL psworg,savearea,sync l %r1,\savearea+12 .if \sync tm \psworg+1,0x01 bz BASED(1f) l %r1,__LC_KERNEL_STACK .else tm \psworg+1,0x01 bnz BASED(0f) l %r0,__LC_ASYNC_STACK slr %r0,%r1 sra %r0,13 bz BASED(1f) 0: l %r1,__LC_ASYNC_STACK .endif 1: s %r1,BASED(.Lc_spsize) st %r1,SP_R15(%r15) l %r0,BASED(.L\psworg) xc SP_R12(4,%r15),SP_R12(%r15) icm %r0,12,__LC_SVC_ILC st %r0,SP_R14(%r15) mvc SP_R0(48,%r1),SP_R0(%r15) mvc SP_ORIG_R2(4,%r1),SP_R2(%r15) mvc SP_R12(16,%r1),\savearea mvc SP_PSW(8,%r1),\psworg st %r0,SP_ILC(%r1) xc 0(4,%r1),0(%r1) .endm .macro RESTORE_ALL # system exit macro mvc __LC_RETURN_PSW(8),SP_PSW(%r15) # move user PSW to lowcore ni __LC_RETURN_PSW+1,0xfd # clear wait state bit lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 of user lpsw __LC_RETURN_PSW # back to caller .endm .macro CLEANUP_RESTORE_ALL l %r1,SP_PSW+4(%r15) cli 0(%r1),0x82 jne 0f mvc SP_PSW(8,%r15),__LC_RETURN_PSW j 1f 0: l %r1,SP_R15(%r15) mvc SP_PSW(8,%r15),SP_PSW(%r1) mvc SP_R0(64,%r15),SP_R0(%r1) 1: .endm .macro GET_THREAD_INFO l %r9,__LC_THREAD_INFO .endm .macro CHECK_CRITICAL tm SP_PSW+1(%r15),0x01 # test problem state bit bnz BASED(0f) # from user -> not critical clc SP_PSW+4(4,%r15),BASED(.Lcritical_end) jnl 0f clc SP_PSW+4(4,%r15),BASED(.Lcritical_start) jl 0f l %r1,BASED(.Lcleanup_critical) basr %r14,%r1 0: .endm /* * Scheduler resume function, called by switch_to * gpr2 = (task_struct *) prev * gpr3 = (task_struct *) next * Returns: * gpr2 = prev */ .globl __switch_to __switch_to: basr %r1,0 __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) 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 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 st %r3,__LC_CURRENT # __LC_CURRENT = current task struct l %r3,__THREAD_info(%r3) # load thread_info from task struct st %r3,__LC_THREAD_INFO ahi %r3,8192 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 * are executed with interrupts enabled. */ .globl system_call system_call: SAVE_ALL_BASE __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1 SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1 lh %r7,0x8a # get svc number from lowcore sysc_enter: GET_THREAD_INFO # load pointer to task_struct to R9 sla %r7,2 # *4 and test for svc 0 bnz BASED(sysc_do_restart) # svc number > 0 # svc 0: system call number in %r1 cl %r1,BASED(.Lnr_syscalls) bnl BASED(sysc_do_restart) lr %r7,%r1 # copy svc number to %r7 sla %r7,2 # *4 sysc_do_restart: tm __TI_flags+3(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT) l %r8,sys_call_table-system_call(%r7,%r13) # get system call addr. bo BASED(sysc_tracesys) basr %r14,%r8 # call sys_xxxx st %r2,SP_R2(%r15) # store return value (change R2 on stack) # ATTENTION: check sys_execve_glue before # changing anything here !! sysc_return: tm SP_PSW+1(%r15),0x01 # returning to user ? bno BASED(sysc_leave) tm __TI_flags+3(%r9),_TIF_WORK_SVC bnz BASED(sysc_work) # there is work to do (signals etc.) sysc_leave: RESTORE_ALL # # recheck if there is more work to do # sysc_work_loop: GET_THREAD_INFO # load pointer to task_struct to R9 tm __TI_flags+3(%r9),_TIF_WORK_SVC bz BASED(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+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_RESTART_SVC bo BASED(sysc_restart) b BASED(sysc_leave) # # _TIF_NEED_RESCHED is set, call schedule # sysc_reschedule: l %r1,BASED(.Lschedule) la %r14,BASED(sysc_work_loop) br %r1 # call scheduler # # _TIF_SIGPENDING is set, call do_signal # sysc_sigpending: 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 # # _TIF_RESTART_SVC is set, set up registers and restart svc # sysc_restart: ni __TI_flags+3(%r9),255-_TIF_RESTART_SVC # clear TIF_RESTART_SVC l %r7,SP_R2(%r15) # load new svc number sla %r7,2 mvc SP_R2(4,%r15),SP_ORIG_R2(%r15) # restore first argument lm %r2,%r6,SP_R2(%r15) # load svc arguments b BASED(sysc_do_restart) # restart svc __critical_end: # # call trace before and after sys_call # sysc_tracesys: l %r1,BASED(.Ltrace) la %r2,SP_PTREGS(%r15) # load pt_regs la %r3,0 srl %r7,2 st %r7,SP_R2(%r15) basr %r14,%r1 clc SP_R2(4,%r15),BASED(.Lnr_syscalls) bnl BASED(sysc_tracenogo) l %r7,SP_R2(%r15) # strace might have changed the sll %r7,2 # system call l %r8,sys_call_table-system_call(%r7,%r13) sysc_tracego: lm %r3,%r6,SP_R3(%r15) l %r2,SP_ORIG_R2(%r15) basr %r14,%r8 # call sys_xxx st %r2,SP_R2(%r15) # store return value sysc_tracenogo: tm __TI_flags+3(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT) bno BASED(sysc_return) l %r1,BASED(.Ltrace) la %r2,SP_PTREGS(%r15) # load pt_regs la %r3,1 la %r14,BASED(sysc_return) br %r1 # # a new process exits the kernel with ret_from_fork # .globl ret_from_fork ret_from_fork: l %r13,__LC_SVC_NEW_PSW+4 GET_THREAD_INFO # load pointer to task_struct to R9 l %r1,BASED(.Lschedtail) basr %r14,%r1 stosm 24(%r15),0x03 # reenable interrupts b BASED(sysc_return) # # clone, fork, vfork, exec and sigreturn need glue, # because they all expect pt_regs as parameter, # but are called with different parameter. # return-address is set up above # sys_clone_glue: la %r2,SP_PTREGS(%r15) # load pt_regs l %r1,BASED(.Lclone) br %r1 # branch to sys_clone sys_fork_glue: la %r2,SP_PTREGS(%r15) # load pt_regs l %r1,BASED(.Lfork) br %r1 # branch to sys_fork sys_vfork_glue: la %r2,SP_PTREGS(%r15) # load pt_regs l %r1,BASED(.Lvfork) br %r1 # branch to sys_vfork sys_execve_glue: la %r2,SP_PTREGS(%r15) # load pt_regs l %r1,BASED(.Lexecve) lr %r12,%r14 # save return address basr %r14,%r1 # call sys_execve ltr %r2,%r2 # check if execve failed bnz 0(%r12) # it did fail -> store result in gpr2 b 4(%r12) # SKIP ST 2,SP_R2(15) after BASR 14,8 # in system_call/sysc_tracesys sys_sigreturn_glue: la %r2,SP_PTREGS(%r15) # load pt_regs as parameter l %r1,BASED(.Lsigreturn) br %r1 # branch to sys_sigreturn sys_rt_sigreturn_glue: la %r2,SP_PTREGS(%r15) # load pt_regs as parameter 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) br %r1 # branch to sys_sigreturn /* * Program check handler routine */ .globl pgm_check_handler pgm_check_handler: /* * First we need to check for a special case: * Single stepping an instruction that disables the PER event mask will * cause a PER event AFTER the mask has been set. Example: SVC or LPSW. * For a single stepped SVC the program check handler gets control after * the SVC new PSW has been loaded. But we want to execute the SVC first and * then handle the PER event. Therefore we update the SVC old PSW to point * to the pgm_check_handler and branch to the SVC handler after we checked * if we have to load the kernel stack register. * For every other possible cause for PER event without the PER mask set * we just ignore the PER event (FIXME: is there anything we have to do * for LPSW?). */ SAVE_ALL_BASE __LC_PGM_OLD_PSW,__LC_SAVE_AREA,1 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 l %r3,__LC_PGM_ILC # load program interruption code la %r8,0x7f l %r7,BASED(.Ljump_table) nr %r8,%r3 sll %r8,2 GET_THREAD_INFO l %r7,0(%r8,%r7) # load address of handler routine la %r2,SP_PTREGS(%r15) # address of register-save area la %r14,BASED(sysc_return) br %r7 # branch to interrupt-handler # # handle per exception # pgm_per: tm __LC_PGM_OLD_PSW,0x40 # test if per event recording is on bnz BASED(pgm_per_std) # ok, normal per event from user space # ok its one of the special cases, now we need to find out which one clc __LC_PGM_OLD_PSW(8),__LC_SVC_NEW_PSW be BASED(pgm_svcper) # no interesting special case, ignore PER event lm %r13,%r15,__LC_SAVE_AREA lpsw 0x28 # # Normal per exception # 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(4,%r9),__LC_PER_ADDRESS mvc __THREAD_per+__PER_access_id(1,%r9),__LC_PER_ACCESS_ID la %r4,0x7f l %r3,__LC_PGM_ILC # load program interruption code nr %r4,%r3 # clear per-event-bit and ilc be BASED(pgm_per_only) # only per or per+check ? l %r1,BASED(.Ljump_table) sll %r4,2 l %r1,0(%r4,%r1) # load address of handler routine la %r2,SP_PTREGS(%r15) # address of register-save area basr %r14,%r1 # branch to interrupt-handler pgm_per_only: la %r2,SP_PTREGS(15) # 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 br %r1 # branch to do_debugger_trap # # it was a single stepped SVC that is causing all the trouble # pgm_svcper: SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1 lh %r7,0x8a # get svc number from lowcore stosm 24(%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(4,%r9),__LC_PER_ADDRESS mvc __THREAD_per+__PER_access_id(1,%r9),__LC_PER_ACCESS_ID sla %r7,2 # *4 and test for svc 0 bnz BASED(pgm_svcstd) # svc number > 0 ? # svc 0: system call number in %r1 cl %r1,BASED(.Lnr_syscalls) bnl BASED(pgm_svcstd) lr %r7,%r1 # copy svc number to %r7 sla %r7,2 # *4 pgm_svcstd: tm __TI_flags+3(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT) l %r8,sys_call_table-system_call(%r7,%r13) # get system call addr. bo BASED(pgm_tracesys) basr %r14,%r8 # call sys_xxxx st %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+3(%r9),_TIF_SIGPENDING bno BASED(pgm_svcper_nosig) la %r2,SP_PTREGS(%r15) # load pt_regs sr %r3,%r3 # clear *oldset l %r1,BASED(.Ldo_signal) basr %r14,%r1 # call do_signal pgm_svcper_nosig: mvi SP_TRAP+3(%r15),0x28 # set trap indication to pgm check la %r2,SP_PTREGS(15) # 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 br %r1 # branch to do_debugger_trap # # call trace before and after sys_call # pgm_tracesys: l %r1,BASED(.Ltrace) la %r2,SP_PTREGS(%r15) # load pt_regs la %r3,0 srl %r7,2 st %r7,SP_R2(%r15) basr %r14,%r1 clc SP_R2(4,%r15),BASED(.Lnr_syscalls) bnl BASED(pgm_svc_nogo) l %r7,SP_R2(%r15) # strace changed the syscall sll %r7,2 l %r8,sys_call_table-system_call(%r7,%r13) pgm_svc_go: lm %r3,%r6,SP_R3(%r15) l %r2,SP_ORIG_R2(%r15) basr %r14,%r8 # call sys_xxx st %r2,SP_R2(%r15) # store return value pgm_svc_nogo: tm __TI_flags+3(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT) bno BASED(pgm_svcret) l %r1,BASED(.Ltrace) la %r2,SP_PTREGS(%r15) # load pt_regs la %r3,1 la %r14,BASED(pgm_svcret) br %r1 /* * IO interrupt handler routine */ .globl io_int_handler io_int_handler: SAVE_ALL_BASE __LC_IO_OLD_PSW,__LC_SAVE_AREA+16,0 SAVE_ALL __LC_IO_OLD_PSW,__LC_SAVE_AREA+16,0 stck __LC_INT_CLOCK CHECK_CRITICAL GET_THREAD_INFO # load pointer to task_struct to R9 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 io_return: tm SP_PSW+1(%r15),0x01 # returning to user ? #ifdef CONFIG_PREEMPT bno BASED(io_preempt) # no -> check for preemptive scheduling #else bno BASED(io_leave) # no-> skip resched & signal #endif tm __TI_flags+3(%r9),_TIF_WORK_INT bnz BASED(io_work) # there is work to do (signals etc.) io_leave: RESTORE_ALL #ifdef CONFIG_PREEMPT io_preempt: icm %r0,15,__TI_precount(%r9) bnz BASED(io_leave) 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 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 l %r1,BASED(.Lschedule) basr %r14,%r1 # call schedule stnsm 24(%r15),0xfc # disable I/O and ext. interrupts GET_THREAD_INFO # load pointer to task_struct to R9 xc __TI_precount(4,%r9),__TI_precount(%r9) b BASED(io_resume_loop) #endif # # switch to kernel stack, then check the TIF bits # io_work: 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 lr %r15,%r1 # # One of the work bits is on. Find out which one. # Checked are: _TIF_SIGPENDING and _TIF_NEED_RESCHED # io_work_loop: tm __TI_flags+3(%r9),_TIF_NEED_RESCHED bo BASED(io_reschedule) tm __TI_flags+3(%r9),_TIF_SIGPENDING bo BASED(io_sigpending) b BASED(io_leave) # # _TIF_NEED_RESCHED is set, call schedule # io_reschedule: l %r1,BASED(.Lschedule) stosm 24(%r15),0x03 # reenable interrupts basr %r14,%r1 # call scheduler stnsm 24(%r15),0xfc # disable I/O and ext. interrupts GET_THREAD_INFO # load pointer to task_struct to R9 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 # io_sigpending: stosm 24(%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 /* * External interrupt handler routine */ .globl ext_int_handler ext_int_handler: SAVE_ALL_BASE __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16,0 SAVE_ALL __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16,0 stck __LC_INT_CLOCK CHECK_CRITICAL GET_THREAD_INFO # load pointer to task_struct to R9 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 b BASED(io_return) /* * Machine check handler routines */ .globl mcck_int_handler mcck_int_handler: SAVE_ALL_BASE __LC_MCK_OLD_PSW,__LC_SAVE_AREA+32,0 SAVE_ALL __LC_MCK_OLD_PSW,__LC_SAVE_AREA+32,0 l %r1,BASED(.Ls390_mcck) basr %r14,%r1 # call machine check handler mcck_return: RESTORE_ALL #ifdef CONFIG_SMP /* * Restart interruption handler, kick starter for additional CPUs */ .globl restart_int_handler restart_int_handler: 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 basr %r14,0 l %r14,restart_addr-.(%r14) br %r14 # branch to start_secondary restart_addr: .long start_secondary #else /* * If we do not run with SMP enabled, let the new CPU crash ... */ .globl restart_int_handler restart_int_handler: basr %r1,0 restart_base: lpsw restart_crash-restart_base(%r1) .align 8 restart_crash: .long 0x000a0000,0x00000000 restart_go: #endif cleanup_table: .long system_call, sysc_enter, cleanup_sysc_enter .long sysc_return, sysc_leave, cleanup_sysc_return .long sysc_leave, sysc_work_loop, cleanup_sysc_leave .long sysc_work_loop, sysc_reschedule, cleanup_sysc_return cleanup_table_entries=(.-cleanup_table) / 12 cleanup_critical: lhi %r0,cleanup_table_entries la %r1,BASED(cleanup_table) l %r2,SP_PSW+4(%r15) la %r2,0(%r2) cleanup_loop: cl %r2,0(%r1) bl BASED(cleanup_cont) cl %r2,4(%r1) bl BASED(cleanup_found) cleanup_cont: la %r1,12(%r1) bct %r0,BASED(cleanup_loop) br %r14 cleanup_found: l %r1,8(%r1) br %r1 cleanup_sysc_enter: CLEANUP_SAVE_ALL_BASE __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1 CLEANUP_SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1 lh %r0,0x8a st %r0,SP_R7(%r15) la %r1,BASED(sysc_enter) o %r1,BASED(.Lamode) st %r1,SP_PSW+4(%r15) br %r14 cleanup_sysc_return: la %r1,BASED(sysc_return) o %r1,BASED(.Lamode) st %r1,SP_PSW+4(%r15) br %r14 cleanup_sysc_leave: CLEANUP_RESTORE_ALL br %r14 /* * Integer constants */ .align 4 .Lc_spsize: .long SP_SIZE .Lc_overhead: .long STACK_FRAME_OVERHEAD .Lc_pactive: .long PREEMPT_ACTIVE .Lnr_syscalls: .long NR_syscalls .L0x018: .long 0x018 .L0x020: .long 0x020 .L0x028: .long 0x028 .L0x030: .long 0x030 .L0x038: .long 0x038 .Lamode: .long 0x80000000 /* * Symbol constants */ .Ls390_mcck: .long s390_do_machine_check .Ldo_IRQ: .long do_IRQ .Ldo_extint: .long do_extint .Ldo_signal: .long do_signal .Ldo_softirq: .long do_softirq .Lhandle_per: .long do_debugger_trap .Ljump_table: .long pgm_check_table .Lschedule: .long schedule .Lclone: .long sys_clone .Lexecve: .long sys_execve .Lfork: .long sys_fork .Lrt_sigreturn:.long sys_rt_sigreturn .Lrt_sigsuspend: .long sys_rt_sigsuspend .Lsigreturn: .long sys_sigreturn .Lsigsuspend: .long sys_sigsuspend .Lsigaltstack: .long sys_sigaltstack .Ltrace: .long syscall_trace .Lvfork: .long sys_vfork .Lschedtail: .long schedule_tail .Lcritical_start: .long __critical_start + 0x80000000 .Lcritical_end: .long __critical_end + 0x80000000 .Lcleanup_critical: .long cleanup_critical #define SYSCALL(esa,esame,emu) .long esa .globl sys_call_table sys_call_table: #include "syscalls.S" #undef SYSCALL