diff options
Diffstat (limited to 'arch/s390/kernel/entry.S')
| -rw-r--r-- | arch/s390/kernel/entry.S | 481 |
1 files changed, 246 insertions, 235 deletions
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S index 5b5799ac8f8..dddc3de3040 100644 --- a/arch/s390/kernel/entry.S +++ b/arch/s390/kernel/entry.S @@ -4,8 +4,8 @@ * * Copyright (C) IBM Corp. 1999,2006 * 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), + * Hartmut Penner (hp@de.ibm.com), + * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com), * Heiko Carstens <heiko.carstens@de.ibm.com> */ @@ -24,29 +24,29 @@ * 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_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 + 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 +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 + 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_RESTORE_SIGMASK | _TIF_NEED_RESCHED | \ _TIF_MCCK_PENDING | _TIF_RESTART_SVC | _TIF_SINGLE_STEP ) @@ -81,14 +81,14 @@ STACK_SIZE = 1 << STACK_SHIFT * R15 - kernel stack pointer */ - .macro STORE_TIMER lc_offset + .macro STORE_TIMER lc_offset #ifdef CONFIG_VIRT_CPU_ACCOUNTING stpt \lc_offset #endif .endm #ifdef CONFIG_VIRT_CPU_ACCOUNTING - .macro UPDATE_VTIME lc_from,lc_to,lc_sum + .macro UPDATE_VTIME lc_from,lc_to,lc_sum lm %r10,%r11,\lc_from sl %r10,\lc_to sl %r11,\lc_to+4 @@ -147,7 +147,7 @@ STACK_SIZE = 1 << STACK_SHIFT 2: .endm - .macro CREATE_STACK_FRAME psworg,savearea + .macro CREATE_STACK_FRAME psworg,savearea s %r15,BASED(.Lc_spsize) # make room for registers & psw mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack la %r12,\psworg @@ -160,7 +160,7 @@ STACK_SIZE = 1 << STACK_SHIFT st %r12,__SF_BACKCHAIN(%r15) # clear back chain .endm - .macro RESTORE_ALL psworg,sync + .macro RESTORE_ALL psworg,sync mvc \psworg(8),SP_PSW(%r15) # move user PSW to lowcore .if !\sync ni \psworg+1,0xfd # clear wait state bit @@ -177,16 +177,16 @@ STACK_SIZE = 1 << STACK_SHIFT * Returns: * gpr2 = prev */ - .globl __switch_to + .globl __switch_to __switch_to: - basr %r1,0 + 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,__SF_EMPTY(%r15) # We are using per stuff - clc __THREAD_per(12,%r3),__SF_EMPTY(%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 + stctl %c9,%c11,__SF_EMPTY(%r15) # We are using per stuff + clc __THREAD_per(12,%r3),__SF_EMPTY(%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: l %r4,__THREAD_info(%r2) # get thread_info of prev tm __TI_flags+3(%r4),_TIF_MCCK_PENDING # machine check pending? @@ -195,13 +195,13 @@ __switch_to_noper: l %r4,__THREAD_info(%r3) # get thread_info of next oi __TI_flags+3(%r4),_TIF_MCCK_PENDING # set it in next __switch_to_no_mcck: - stm %r6,%r15,__SF_GPRS(%r15)# store __switch_to registers of prev task + stm %r6,%r15,__SF_GPRS(%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,__SF_GPRS(%r15)# load __switch_to registers of next task st %r3,__LC_CURRENT # __LC_CURRENT = current task struct lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4 - l %r3,__THREAD_info(%r3) # load thread_info from task struct + l %r3,__THREAD_info(%r3) # load thread_info from task struct st %r3,__LC_THREAD_INFO ahi %r3,STACK_SIZE st %r3,__LC_KERNEL_STACK # __LC_KERNEL_STACK = new kernel stack @@ -213,7 +213,7 @@ __critical_start: * are executed with interrupts enabled. */ - .globl system_call + .globl system_call system_call: STORE_TIMER __LC_SYNC_ENTER_TIMER sysc_saveall: @@ -233,24 +233,24 @@ sysc_update: #endif sysc_do_svc: l %r9,__LC_THREAD_INFO # load pointer to thread_info struct - sla %r7,2 # *4 and test for svc 0 - bnz BASED(sysc_nr_ok) # svc number > 0 + sla %r7,2 # *4 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) - lr %r7,%r1 # copy svc number to %r7 - sla %r7,2 # *4 + lr %r7,%r1 # copy svc number to %r7 + sla %r7,2 # *4 sysc_nr_ok: mvc SP_ARGS(4,%r15),SP_R7(%r15) sysc_do_restart: l %r8,BASED(.Lsysc_table) tm __TI_flags+3(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT) l %r8,0(%r7,%r8) # get system call addr. - bnz 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 !! + bnz 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 ? @@ -258,14 +258,14 @@ sysc_return: tm __TI_flags+3(%r9),_TIF_WORK_SVC bnz BASED(sysc_work) # there is work to do (signals etc.) sysc_leave: - RESTORE_ALL __LC_RETURN_PSW,1 + RESTORE_ALL __LC_RETURN_PSW,1 # # recheck if there is more work to do # sysc_work_loop: tm __TI_flags+3(%r9),_TIF_WORK_SVC - bz BASED(sysc_leave) # there is no work to do + bz BASED(sysc_leave) # there is no work to do # # One of the work bits is on. Find out which one. # @@ -284,11 +284,11 @@ sysc_work: # # _TIF_NEED_RESCHED is set, call schedule -# -sysc_reschedule: - l %r1,BASED(.Lschedule) - la %r14,BASED(sysc_work_loop) - br %r1 # call scheduler +# +sysc_reschedule: + l %r1,BASED(.Lschedule) + la %r14,BASED(sysc_work_loop) + br %r1 # call scheduler # # _TIF_MCCK_PENDING is set, call handler @@ -301,11 +301,11 @@ sysc_mcck_pending: # # _TIF_SIGPENDING or _TIF_RESTORE_SIGMASK is set, call do_signal # -sysc_sigpending: +sysc_sigpending: ni __TI_flags+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP - la %r2,SP_PTREGS(%r15) # load pt_regs - l %r1,BASED(.Ldo_signal) - basr %r14,%r1 # call do_signal + la %r2,SP_PTREGS(%r15) # load pt_regs + l %r1,BASED(.Ldo_signal) + basr %r14,%r1 # call do_signal tm __TI_flags+3(%r9),_TIF_RESTART_SVC bo BASED(sysc_restart) tm __TI_flags+3(%r9),_TIF_SINGLE_STEP @@ -317,11 +317,11 @@ sysc_sigpending: # sysc_restart: ni __TI_flags+3(%r9),255-_TIF_RESTART_SVC # clear TIF_RESTART_SVC - l %r7,SP_R2(%r15) # load new svc number + 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 + lm %r2,%r6,SP_R2(%r15) # load svc arguments + b BASED(sysc_do_restart) # restart svc # # _TIF_SINGLE_STEP is set, call do_single_step @@ -338,8 +338,8 @@ sysc_singlestep: # call trace before and after sys_call # sysc_tracesys: - l %r1,BASED(.Ltrace) - la %r2,SP_PTREGS(%r15) # load pt_regs + l %r1,BASED(.Ltrace) + la %r2,SP_PTREGS(%r15) # load pt_regs la %r3,0 srl %r7,2 st %r7,SP_R2(%r15) @@ -347,19 +347,19 @@ sysc_tracesys: clc SP_R2(4,%r15),BASED(.Lnr_syscalls) bnl BASED(sysc_tracenogo) l %r8,BASED(.Lsysc_table) - l %r7,SP_R2(%r15) # strace might have changed the - sll %r7,2 # system call + l %r7,SP_R2(%r15) # strace might have changed the + sll %r7,2 # system call l %r8,0(%r7,%r8) 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 + 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) - bz BASED(sysc_return) + bz BASED(sysc_return) l %r1,BASED(.Ltrace) - la %r2,SP_PTREGS(%r15) # load pt_regs + la %r2,SP_PTREGS(%r15) # load pt_regs la %r3,1 la %r14,BASED(sysc_return) br %r1 @@ -367,17 +367,17 @@ sysc_tracenogo: # # a new process exits the kernel with ret_from_fork # - .globl ret_from_fork + .globl ret_from_fork ret_from_fork: l %r13,__LC_SVC_NEW_PSW+4 l %r9,__LC_THREAD_INFO # load pointer to thread_info struct tm SP_PSW+1(%r15),0x01 # forking a kernel thread ? bo BASED(0f) st %r15,SP_R15(%r15) # store stack pointer for new kthread -0: l %r1,BASED(.Lschedtail) - basr %r14,%r1 +0: l %r1,BASED(.Lschedtail) + basr %r14,%r1 TRACE_IRQS_ON - stosm __SF_EMPTY(%r15),0x03 # reenable interrupts + stosm __SF_EMPTY(%r15),0x03 # reenable interrupts b BASED(sysc_return) # @@ -386,52 +386,51 @@ ret_from_fork: # 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 +sys_clone_glue: + la %r2,SP_PTREGS(%r15) # load pt_regs + l %r1,BASED(.Lclone) + br %r1 # branch to sys_clone -sys_sigaltstack_glue: - la %r4,SP_PTREGS(%r15) # load pt_regs as parameter - l %r1,BASED(.Lsigaltstack) - br %r1 # branch to sys_sigreturn +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 + +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 + .globl pgm_check_handler pgm_check_handler: /* * First we need to check for a special case: @@ -448,8 +447,8 @@ pgm_check_handler: */ STORE_TIMER __LC_SYNC_ENTER_TIMER SAVE_ALL_BASE __LC_SAVE_AREA - tm __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception - bnz BASED(pgm_per) # got per exception -> special case + 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_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA #ifdef CONFIG_VIRT_CPU_ACCOUNTING @@ -461,29 +460,29 @@ pgm_check_handler: pgm_no_vtime: #endif l %r9,__LC_THREAD_INFO # load pointer to thread_info struct - l %r3,__LC_PGM_ILC # load program interruption code + l %r3,__LC_PGM_ILC # load program interruption code la %r8,0x7f nr %r8,%r3 pgm_do_call: - l %r7,BASED(.Ljump_table) - sll %r8,2 - 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 + l %r7,BASED(.Ljump_table) + sll %r8,2 + 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 + 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) + clc __LC_PGM_OLD_PSW(8),__LC_SVC_NEW_PSW + be BASED(pgm_svcper) # no interesting special case, ignore PER event - lm %r12,%r15,__LC_SAVE_AREA - lpsw 0x28 + lm %r12,%r15,__LC_SAVE_AREA + lpsw 0x28 # # Normal per exception @@ -505,10 +504,12 @@ pgm_no_vtime2: mvc __THREAD_per+__PER_address(4,%r1),__LC_PER_ADDRESS mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID oi __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP - l %r3,__LC_PGM_ILC # load program interruption code + tm SP_PSW+1(%r15),0x01 # kernel per event ? + bz BASED(kernel_per) + l %r3,__LC_PGM_ILC # load program interruption code la %r8,0x7f - nr %r8,%r3 # clear per-event-bit and ilc - be BASED(sysc_return) # only per or per+check ? + nr %r8,%r3 # clear per-event-bit and ilc + be BASED(sysc_return) # only per or per+check ? b BASED(pgm_do_call) # @@ -536,11 +537,21 @@ pgm_no_vtime3: stosm __SF_EMPTY(%r15),0x03 # reenable interrupts b BASED(sysc_do_svc) +# +# per was called from kernel, must be kprobes +# +kernel_per: + mvi SP_TRAP+1(%r15),0x28 # set trap indication to pgm check + la %r2,SP_PTREGS(%r15) # address of register-save area + l %r1,BASED(.Lhandle_per) # load adr. of per handler + la %r14,BASED(sysc_leave) # load adr. of system return + br %r1 # branch to do_single_step + /* * IO interrupt handler routine */ - .globl io_int_handler + .globl io_int_handler io_int_handler: STORE_TIMER __LC_ASYNC_ENTER_TIMER stck __LC_INT_CLOCK @@ -557,42 +568,42 @@ io_no_vtime: #endif l %r9,__LC_THREAD_INFO # load pointer to thread_info struct TRACE_IRQS_OFF - 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 + 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 TRACE_IRQS_ON io_return: - tm SP_PSW+1(%r15),0x01 # returning to user ? + tm SP_PSW+1(%r15),0x01 # returning to user ? #ifdef CONFIG_PREEMPT - bno BASED(io_preempt) # no -> check for preemptive scheduling + bno BASED(io_preempt) # no -> check for preemptive scheduling #else - bno BASED(io_leave) # no-> skip resched & signal + 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.) + bnz BASED(io_work) # there is work to do (signals etc.) io_leave: - RESTORE_ALL __LC_RETURN_PSW,0 + RESTORE_ALL __LC_RETURN_PSW,0 io_done: #ifdef CONFIG_PREEMPT io_preempt: icm %r0,15,__TI_precount(%r9) - bnz BASED(io_leave) + bnz BASED(io_leave) l %r1,SP_R15(%r15) s %r1,BASED(.Lc_spsize) mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) - xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain + xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%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 __SF_EMPTY(%r15),0x03 # reenable interrupts - l %r1,BASED(.Lschedule) + mvc __TI_precount(4,%r9),BASED(.Lc_pactive) + stosm __SF_EMPTY(%r15),0x03 # reenable interrupts + l %r1,BASED(.Lschedule) basr %r14,%r1 # call schedule - stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts - xc __TI_precount(4,%r9),__TI_precount(%r9) + stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts + xc __TI_precount(4,%r9),__TI_precount(%r9) b BASED(io_resume_loop) #endif @@ -603,16 +614,16 @@ io_work: l %r1,__LC_KERNEL_STACK s %r1,BASED(.Lc_spsize) mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) - xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain + xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain lr %r15,%r1 # # One of the work bits is on. Find out which one. # Checked are: _TIF_SIGPENDING, _TIF_RESTORE_SIGMASK, _TIF_NEED_RESCHED -# and _TIF_MCCK_PENDING +# and _TIF_MCCK_PENDING # io_work_loop: tm __TI_flags+3(%r9),_TIF_MCCK_PENDING - bo BASED(io_mcck_pending) + bo BASED(io_mcck_pending) tm __TI_flags+3(%r9),_TIF_NEED_RESCHED bo BASED(io_reschedule) tm __TI_flags+3(%r9),(_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK) @@ -625,36 +636,36 @@ io_work_loop: io_mcck_pending: l %r1,BASED(.Ls390_handle_mcck) la %r14,BASED(io_work_loop) - br %r1 # TIF bit will be cleared by handler + br %r1 # TIF bit will be cleared by handler # # _TIF_NEED_RESCHED is set, call schedule -# -io_reschedule: - l %r1,BASED(.Lschedule) - stosm __SF_EMPTY(%r15),0x03 # reenable interrupts - basr %r14,%r1 # call scheduler - stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts +# +io_reschedule: + l %r1,BASED(.Lschedule) + stosm __SF_EMPTY(%r15),0x03 # reenable interrupts + basr %r14,%r1 # call scheduler + stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts tm __TI_flags+3(%r9),_TIF_WORK_INT - bz BASED(io_leave) # there is no work to do + bz BASED(io_leave) # there is no work to do b BASED(io_work_loop) # # _TIF_SIGPENDING or _TIF_RESTORE_SIGMASK is set, call do_signal # -io_sigpending: - stosm __SF_EMPTY(%r15),0x03 # reenable interrupts - la %r2,SP_PTREGS(%r15) # load pt_regs - l %r1,BASED(.Ldo_signal) - basr %r14,%r1 # call do_signal - stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts +io_sigpending: + stosm __SF_EMPTY(%r15),0x03 # reenable interrupts + la %r2,SP_PTREGS(%r15) # load pt_regs + l %r1,BASED(.Ldo_signal) + basr %r14,%r1 # call do_signal + stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts b BASED(io_work_loop) /* * External interrupt handler routine */ - .globl ext_int_handler + .globl ext_int_handler ext_int_handler: STORE_TIMER __LC_ASYNC_ENTER_TIMER stck __LC_INT_CLOCK @@ -671,8 +682,8 @@ ext_no_vtime: #endif l %r9,__LC_THREAD_INFO # load pointer to thread_info struct TRACE_IRQS_OFF - la %r2,SP_PTREGS(%r15) # address of register-save area - lh %r3,__LC_EXT_INT_CODE # get interruption code + 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 TRACE_IRQS_ON @@ -684,13 +695,13 @@ __critical_end: * Machine check handler routines */ - .globl mcck_int_handler + .globl mcck_int_handler mcck_int_handler: spt __LC_CPU_TIMER_SAVE_AREA # revalidate cpu timer lm %r0,%r15,__LC_GPREGS_SAVE_AREA # revalidate gprs SAVE_ALL_BASE __LC_SAVE_AREA+32 la %r12,__LC_MCK_OLD_PSW - tm __LC_MCCK_CODE,0x80 # system damage? + tm __LC_MCCK_CODE,0x80 # system damage? bo BASED(mcck_int_main) # yes -> rest of mcck code invalid #ifdef CONFIG_VIRT_CPU_ACCOUNTING mvc __LC_SAVE_AREA+52(8),__LC_ASYNC_ENTER_TIMER @@ -729,7 +740,7 @@ mcck_int_main: l %r15,__LC_PANIC_STACK # load panic stack 0: CREATE_STACK_FRAME __LC_MCK_OLD_PSW,__LC_SAVE_AREA+32 #ifdef CONFIG_VIRT_CPU_ACCOUNTING - tm __LC_MCCK_CODE+2,0x08 # mwp of old psw valid? + tm __LC_MCCK_CODE+2,0x08 # mwp of old psw valid? bno BASED(mcck_no_vtime) # no -> skip cleanup critical tm SP_PSW+1(%r15),0x01 # interrupting from user ? bz BASED(mcck_no_vtime) @@ -740,14 +751,14 @@ mcck_no_vtime: #endif l %r9,__LC_THREAD_INFO # load pointer to thread_info struct la %r2,SP_PTREGS(%r15) # load pt_regs - l %r1,BASED(.Ls390_mcck) - basr %r14,%r1 # call machine check handler - tm SP_PSW+1(%r15),0x01 # returning to user ? + l %r1,BASED(.Ls390_mcck) + basr %r14,%r1 # call machine check handler + tm SP_PSW+1(%r15),0x01 # returning to user ? bno BASED(mcck_return) - l %r1,__LC_KERNEL_STACK # switch to kernel stack + l %r1,__LC_KERNEL_STACK # switch to kernel stack s %r1,BASED(.Lc_spsize) mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) - xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain + xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain lr %r15,%r1 stosm __SF_EMPTY(%r15),0x04 # turn dat on tm __TI_flags+3(%r9),_TIF_MCCK_PENDING @@ -771,36 +782,36 @@ mcck_return: lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 lpsw __LC_RETURN_MCCK_PSW # back to caller - RESTORE_ALL __LC_RETURN_MCCK_PSW,0 + RESTORE_ALL __LC_RETURN_MCCK_PSW,0 #ifdef CONFIG_SMP /* * Restart interruption handler, kick starter for additional CPUs */ - .globl restart_int_handler + .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 - lm %r6,%r15,__SF_GPRS(%r15) # load registers from clone - stosm __SF_EMPTY(%r15),0x04 # now we can turn dat on - basr %r14,0 - l %r14,restart_addr-.(%r14) - br %r14 # branch to start_secondary + 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 + lm %r6,%r15,__SF_GPRS(%r15) # load registers from clone + stosm __SF_EMPTY(%r15),0x04 # now we can turn dat on + basr %r14,0 + l %r14,restart_addr-.(%r14) + br %r14 # branch to start_secondary restart_addr: - .long start_secondary + .long start_secondary #else /* * If we do not run with SMP enabled, let the new CPU crash ... */ - .globl restart_int_handler + .globl restart_int_handler restart_int_handler: - basr %r1,0 + basr %r1,0 restart_base: - lpsw restart_crash-restart_base(%r1) - .align 8 + lpsw restart_crash-restart_base(%r1) + .align 8 restart_crash: - .long 0x000a0000,0x00000000 + .long 0x000a0000,0x00000000 restart_go: #endif @@ -822,11 +833,11 @@ stack_overflow: be BASED(0f) la %r1,__LC_SAVE_AREA+16 0: mvc SP_R12(16,%r15),0(%r1) # move %r12-%r15 to stack - xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear back chain + xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear back chain l %r1,BASED(1f) # branch to kernel_stack_overflow - la %r2,SP_PTREGS(%r15) # load pt_regs + la %r2,SP_PTREGS(%r15) # load pt_regs br %r1 -1: .long kernel_stack_overflow +1: .long kernel_stack_overflow #endif cleanup_table_system_call: @@ -928,10 +939,10 @@ cleanup_novtime: cleanup_system_call_insn: .long sysc_saveall + 0x80000000 #ifdef CONFIG_VIRT_CPU_ACCOUNTING - .long system_call + 0x80000000 - .long sysc_vtime + 0x80000000 - .long sysc_stime + 0x80000000 - .long sysc_update + 0x80000000 + .long system_call + 0x80000000 + .long sysc_vtime + 0x80000000 + .long sysc_stime + 0x80000000 + .long sysc_update + 0x80000000 #endif cleanup_sysc_return: @@ -997,57 +1008,57 @@ cleanup_io_leave_insn: /* * 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: .short 0x018 -.L0x020: .short 0x020 -.L0x028: .short 0x028 -.L0x030: .short 0x030 -.L0x038: .short 0x038 -.Lc_1: .long 1 + .align 4 +.Lc_spsize: .long SP_SIZE +.Lc_overhead: .long STACK_FRAME_OVERHEAD +.Lc_pactive: .long PREEMPT_ACTIVE +.Lnr_syscalls: .long NR_syscalls +.L0x018: .short 0x018 +.L0x020: .short 0x020 +.L0x028: .short 0x028 +.L0x030: .short 0x030 +.L0x038: .short 0x038 +.Lc_1: .long 1 /* * Symbol constants */ -.Ls390_mcck: .long s390_do_machine_check +.Ls390_mcck: .long s390_do_machine_check .Ls390_handle_mcck: - .long s390_handle_mcck -.Lmck_old_psw: .long __LC_MCK_OLD_PSW -.Ldo_IRQ: .long do_IRQ -.Ldo_extint: .long do_extint -.Ldo_signal: .long do_signal -.Lhandle_per: .long do_single_step -.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 + .long s390_handle_mcck +.Lmck_old_psw: .long __LC_MCK_OLD_PSW +.Ldo_IRQ: .long do_IRQ +.Ldo_extint: .long do_extint +.Ldo_signal: .long do_signal +.Lhandle_per: .long do_single_step +.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 -.Lsysc_table: .long sys_call_table + .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 +.Lsysc_table: .long sys_call_table #ifdef CONFIG_TRACE_IRQFLAGS -.Ltrace_irq_on:.long trace_hardirqs_on +.Ltrace_irq_on: .long trace_hardirqs_on .Ltrace_irq_off: - .long trace_hardirqs_off + .long trace_hardirqs_off #endif .Lcritical_start: - .long __critical_start + 0x80000000 + .long __critical_start + 0x80000000 .Lcritical_end: - .long __critical_end + 0x80000000 + .long __critical_end + 0x80000000 .Lcleanup_critical: - .long cleanup_critical + .long cleanup_critical - .section .rodata, "a" + .section .rodata, "a" #define SYSCALL(esa,esame,emu) .long esa sys_call_table: #include "syscalls.S" |