diff options
Diffstat (limited to 'arch/s390/kernel/entry.S')
| -rw-r--r-- | arch/s390/kernel/entry.S | 1103 |
1 files changed, 483 insertions, 620 deletions
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S index b13157057e02..3705700ed374 100644 --- a/arch/s390/kernel/entry.S +++ b/arch/s390/kernel/entry.S @@ -19,32 +19,22 @@ #include <asm/unistd.h> #include <asm/page.h> -/* - * 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_SVC_CODE = STACK_FRAME_OVERHEAD + __PT_SVC_CODE -SP_SIZE = STACK_FRAME_OVERHEAD + __PT_SIZE +__PT_R0 = __PT_GPRS +__PT_R1 = __PT_GPRS + 4 +__PT_R2 = __PT_GPRS + 8 +__PT_R3 = __PT_GPRS + 12 +__PT_R4 = __PT_GPRS + 16 +__PT_R5 = __PT_GPRS + 20 +__PT_R6 = __PT_GPRS + 24 +__PT_R7 = __PT_GPRS + 28 +__PT_R8 = __PT_GPRS + 32 +__PT_R9 = __PT_GPRS + 36 +__PT_R10 = __PT_GPRS + 40 +__PT_R11 = __PT_GPRS + 44 +__PT_R12 = __PT_GPRS + 48 +__PT_R13 = __PT_GPRS + 524 +__PT_R14 = __PT_GPRS + 56 +__PT_R15 = __PT_GPRS + 60 _TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ _TIF_MCCK_PENDING | _TIF_PER_TRAP ) @@ -58,133 +48,91 @@ STACK_SIZE = 1 << STACK_SHIFT #define BASED(name) name-system_call(%r13) -#ifdef CONFIG_TRACE_IRQFLAGS .macro TRACE_IRQS_ON +#ifdef CONFIG_TRACE_IRQFLAGS basr %r2,%r0 - l %r1,BASED(.Ltrace_irq_on_caller) - basr %r14,%r1 + l %r1,BASED(.Lhardirqs_on) + basr %r14,%r1 # call trace_hardirqs_on_caller +#endif .endm .macro TRACE_IRQS_OFF +#ifdef CONFIG_TRACE_IRQFLAGS basr %r2,%r0 - l %r1,BASED(.Ltrace_irq_off_caller) - basr %r14,%r1 - .endm -#else -#define TRACE_IRQS_ON -#define TRACE_IRQS_OFF + l %r1,BASED(.Lhardirqs_off) + basr %r14,%r1 # call trace_hardirqs_off_caller #endif + .endm -#ifdef CONFIG_LOCKDEP .macro LOCKDEP_SYS_EXIT - tm SP_PSW+1(%r15),0x01 # returning to user ? - jz 0f +#ifdef CONFIG_LOCKDEP + tm __PT_PSW+1(%r11),0x01 # returning to user ? + jz .+10 l %r1,BASED(.Llockdep_sys_exit) - basr %r14,%r1 -0: - .endm -#else -#define LOCKDEP_SYS_EXIT + basr %r14,%r1 # call lockdep_sys_exit #endif - -/* - * 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 UPDATE_VTIME lc_from,lc_to,lc_sum - lm %r10,%r11,\lc_from - sl %r10,\lc_to - sl %r11,\lc_to+4 - bc 3,BASED(0f) - sl %r10,BASED(.Lc_1) -0: al %r10,\lc_sum - al %r11,\lc_sum+4 - bc 12,BASED(1f) - al %r10,BASED(.Lc_1) -1: stm %r10,%r11,\lc_sum - .endm - - .macro SAVE_ALL_SVC psworg,savearea - stm %r12,%r15,\savearea - l %r13,__LC_SVC_NEW_PSW+4 # load &system_call to %r13 - l %r15,__LC_KERNEL_STACK # problem state -> load ksp - s %r15,BASED(.Lc_spsize) # make room for registers & psw - .endm - - .macro SAVE_ALL_BASE savearea - stm %r12,%r15,\savearea - l %r13,__LC_SVC_NEW_PSW+4 # load &system_call to %r13 .endm - .macro SAVE_ALL_PGM psworg,savearea - tm \psworg+1,0x01 # test problem state bit + .macro CHECK_STACK stacksize,savearea #ifdef CONFIG_CHECK_STACK - bnz BASED(1f) - tml %r15,STACK_SIZE - CONFIG_STACK_GUARD - bnz BASED(2f) - la %r12,\psworg - b BASED(stack_overflow) -#else - bz BASED(2f) + tml %r15,\stacksize - CONFIG_STACK_GUARD + la %r14,\savearea + jz stack_overflow #endif -1: l %r15,__LC_KERNEL_STACK # problem state -> load ksp -2: s %r15,BASED(.Lc_spsize) # make room for registers & psw .endm - .macro SAVE_ALL_ASYNC psworg,savearea - stm %r12,%r15,\savearea - l %r13,__LC_SVC_NEW_PSW+4 # load &system_call to %r13 - la %r12,\psworg - tm \psworg+1,0x01 # test problem state bit - bnz BASED(1f) # from user -> load async stack - clc \psworg+4(4),BASED(.Lcritical_end) - bhe BASED(0f) - clc \psworg+4(4),BASED(.Lcritical_start) - bl BASED(0f) - l %r14,BASED(.Lcleanup_critical) - basr %r14,%r14 - tm 1(%r12),0x01 # retest problem state after cleanup - bnz BASED(1f) -0: l %r14,__LC_ASYNC_STACK # are we already on the async stack ? + .macro SWITCH_ASYNC savearea,stack,shift + tmh %r8,0x0001 # interrupting from user ? + jnz 1f + lr %r14,%r9 + sl %r14,BASED(.Lcritical_start) + cl %r14,BASED(.Lcritical_length) + jhe 0f + la %r11,\savearea # inside critical section, do cleanup + bras %r14,cleanup_critical + tmh %r8,0x0001 # retest problem state after cleanup + jnz 1f +0: l %r14,\stack # are we already on the target stack? slr %r14,%r15 - sra %r14,STACK_SHIFT -#ifdef CONFIG_CHECK_STACK - bnz BASED(1f) - tml %r15,STACK_SIZE - CONFIG_STACK_GUARD - bnz BASED(2f) - b BASED(stack_overflow) -#else - bz BASED(2f) -#endif -1: l %r15,__LC_ASYNC_STACK -2: s %r15,BASED(.Lc_spsize) # make room for registers & psw + sra %r14,\shift + jnz 1f + CHECK_STACK 1<<\shift,\savearea + j 2f +1: l %r15,\stack # load target stack +2: ahi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) + la %r11,STACK_FRAME_OVERHEAD(%r15) .endm - .macro CREATE_STACK_FRAME savearea - xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) - st %r2,SP_ORIG_R2(%r15) # store original content of gpr 2 - mvc SP_R12(16,%r15),\savearea # move %r12-%r15 to stack - stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack + .macro ADD64 high,low,timer + al \high,\timer + al \low,\timer+4 + brc 12,.+8 + ahi \high,1 .endm - .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 - .endif - lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 of user - stpt __LC_EXIT_TIMER - lpsw \psworg # back to caller + .macro SUB64 high,low,timer + sl \high,\timer + sl \low,\timer+4 + brc 3,.+8 + ahi \high,-1 + .endm + + .macro UPDATE_VTIME high,low,enter_timer + lm \high,\low,__LC_EXIT_TIMER + SUB64 \high,\low,\enter_timer + ADD64 \high,\low,__LC_USER_TIMER + stm \high,\low,__LC_USER_TIMER + lm \high,\low,__LC_LAST_UPDATE_TIMER + SUB64 \high,\low,__LC_EXIT_TIMER + ADD64 \high,\low,__LC_SYSTEM_TIMER + stm \high,\low,__LC_SYSTEM_TIMER + mvc __LC_LAST_UPDATE_TIMER(8),\enter_timer .endm .macro REENABLE_IRQS - mvc __SF_EMPTY(1,%r15),SP_PSW(%r15) - ni __SF_EMPTY(%r15),0xbf - ssm __SF_EMPTY(%r15) + st %r8,__LC_RETURN_PSW + ni __LC_RETURN_PSW,0xbf + ssm __LC_RETURN_PSW .endm .section .kprobes.text, "ax" @@ -197,14 +145,13 @@ STACK_SIZE = 1 << STACK_SHIFT * gpr2 = prev */ ENTRY(__switch_to) - basr %r1,0 -0: l %r4,__THREAD_info(%r2) # get thread_info of prev + l %r4,__THREAD_info(%r2) # get thread_info of prev l %r5,__THREAD_info(%r3) # get thread_info of next tm __TI_flags+3(%r4),_TIF_MCCK_PENDING # machine check pending? - bz 1f-0b(%r1) + jz 0f ni __TI_flags+3(%r4),255-_TIF_MCCK_PENDING # clear flag in prev oi __TI_flags+3(%r5),_TIF_MCCK_PENDING # set it in next -1: stm %r6,%r15,__SF_GPRS(%r15) # store gprs of prev task +0: stm %r6,%r15,__SF_GPRS(%r15) # store gprs of prev task st %r15,__THREAD_ksp(%r2) # store kernel stack of prev l %r15,__THREAD_ksp(%r3) # load kernel stack of next lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4 @@ -224,48 +171,55 @@ __critical_start: ENTRY(system_call) stpt __LC_SYNC_ENTER_TIMER -sysc_saveall: - SAVE_ALL_SVC __LC_SVC_OLD_PSW,__LC_SAVE_AREA - CREATE_STACK_FRAME __LC_SAVE_AREA - 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_stm: + stm %r8,%r15,__LC_SAVE_AREA_SYNC + l %r12,__LC_THREAD_INFO + l %r13,__LC_SVC_NEW_PSW+4 +sysc_per: + l %r15,__LC_KERNEL_STACK + ahi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) + la %r11,STACK_FRAME_OVERHEAD(%r15) # pointer to pt_regs sysc_vtime: - UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER -sysc_stime: - UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER -sysc_update: - mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER + UPDATE_VTIME %r8,%r9,__LC_SYNC_ENTER_TIMER + stm %r0,%r7,__PT_R0(%r11) + mvc __PT_R8(32,%r11),__LC_SAVE_AREA_SYNC + mvc __PT_PSW(8,%r11),__LC_SVC_OLD_PSW + mvc __PT_INT_CODE(4,%r11),__LC_SVC_ILC sysc_do_svc: - xr %r7,%r7 - icm %r7,3,SP_SVC_CODE+2(%r15)# load svc number and test for svc 0 - bnz BASED(sysc_nr_ok) # svc number > 0 + oi __TI_flags+3(%r12),_TIF_SYSCALL + lh %r8,__PT_INT_CODE+2(%r11) + sla %r8,2 # shift and test for svc0 + jnz sysc_nr_ok # svc 0: system call number in %r1 cl %r1,BASED(.Lnr_syscalls) - bnl BASED(sysc_nr_ok) - sth %r1,SP_SVC_CODE+2(%r15) - lr %r7,%r1 # copy svc number to %r7 + jnl sysc_nr_ok + sth %r1,__PT_INT_CODE+2(%r11) + lr %r8,%r1 + sla %r8,2 sysc_nr_ok: - sll %r7,2 # svc number *4 - l %r10,BASED(.Lsysc_table) + l %r10,BASED(.Lsys_call_table) # 31 bit system call table + xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) + st %r2,__PT_ORIG_GPR2(%r11) + st %r7,STACK_FRAME_OVERHEAD(%r15) + l %r9,0(%r8,%r10) # get system call addr. 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) - basr %r14,%r8 # call sys_xxxx - st %r2,SP_R2(%r15) # store return value (change R2 on stack) + jnz sysc_tracesys + basr %r14,%r9 # call sys_xxxx + st %r2,__PT_R2(%r11) # store return value sysc_return: LOCKDEP_SYS_EXIT sysc_tif: - tm SP_PSW+1(%r15),0x01 # returning to user ? - bno BASED(sysc_restore) + tm __PT_PSW+1(%r11),0x01 # returning to user ? + jno sysc_restore tm __TI_flags+3(%r12),_TIF_WORK_SVC - bnz BASED(sysc_work) # there is work to do (signals etc.) + jnz sysc_work # check for work ni __TI_flags+3(%r12),255-_TIF_SYSCALL sysc_restore: - RESTORE_ALL __LC_RETURN_PSW,1 + mvc __LC_RETURN_PSW(8),__PT_PSW(%r11) + stpt __LC_EXIT_TIMER + lm %r0,%r15,__PT_R0(%r11) + lpsw __LC_RETURN_PSW sysc_done: # @@ -273,16 +227,16 @@ sysc_done: # sysc_work: tm __TI_flags+3(%r12),_TIF_MCCK_PENDING - bo BASED(sysc_mcck_pending) + jo sysc_mcck_pending tm __TI_flags+3(%r12),_TIF_NEED_RESCHED - bo BASED(sysc_reschedule) + jo sysc_reschedule tm __TI_flags+3(%r12),_TIF_SIGPENDING - bo BASED(sysc_sigpending) + jo sysc_sigpending tm __TI_flags+3(%r12),_TIF_NOTIFY_RESUME - bo BASED(sysc_notify_resume) + jo sysc_notify_resume tm __TI_flags+3(%r12),_TIF_PER_TRAP - bo BASED(sysc_singlestep) - b BASED(sysc_return) # beware of critical section cleanup + jo sysc_singlestep + j sysc_return # beware of critical section cleanup # # _TIF_NEED_RESCHED is set, call schedule @@ -290,13 +244,13 @@ sysc_work: sysc_reschedule: l %r1,BASED(.Lschedule) la %r14,BASED(sysc_return) - br %r1 # call scheduler + br %r1 # call schedule # # _TIF_MCCK_PENDING is set, call handler # sysc_mcck_pending: - l %r1,BASED(.Ls390_handle_mcck) + l %r1,BASED(.Lhandle_mcck) la %r14,BASED(sysc_return) br %r1 # TIF bit will be cleared by handler @@ -305,23 +259,24 @@ sysc_mcck_pending: # sysc_sigpending: ni __TI_flags+3(%r12),255-_TIF_PER_TRAP # clear TIF_PER_TRAP - la %r2,SP_PTREGS(%r15) # load pt_regs + lr %r2,%r11 # pass pointer to pt_regs l %r1,BASED(.Ldo_signal) basr %r14,%r1 # call do_signal 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 + jno sysc_return + lm %r2,%r7,__PT_R2(%r11) # load svc arguments + xr %r8,%r8 # svc 0 returns -ENOSYS + clc __PT_INT_CODE+2(2,%r11),BASED(.Lnr_syscalls+2) + jnl sysc_nr_ok # invalid svc number -> do svc 0 + lh %r8,__PT_INT_CODE+2(%r11) # load new svc number + sla %r8,2 + j sysc_nr_ok # restart svc # # _TIF_NOTIFY_RESUME is set, call do_notify_resume # sysc_notify_resume: - la %r2,SP_PTREGS(%r15) # load pt_regs + lr %r2,%r11 # pass pointer to pt_regs l %r1,BASED(.Ldo_notify_resume) la %r14,BASED(sysc_return) br %r1 # call do_notify_resume @@ -331,56 +286,57 @@ sysc_notify_resume: # sysc_singlestep: 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 - br %r1 # branch to do_per_trap + lr %r2,%r11 # pass pointer to pt_regs + l %r1,BASED(.Ldo_per_trap) + la %r14,BASED(sysc_return) + br %r1 # call do_per_trap # # call tracehook_report_syscall_entry/tracehook_report_syscall_exit before # and after the system call # sysc_tracesys: - l %r1,BASED(.Ltrace_entry) - la %r2,SP_PTREGS(%r15) # load pt_regs + l %r1,BASED(.Ltrace_enter) + lr %r2,%r11 # pass pointer to pt_regs la %r3,0 xr %r0,%r0 - icm %r0,3,SP_SVC_CODE(%r15) - st %r0,SP_R2(%r15) - basr %r14,%r1 + icm %r0,3,__PT_INT_CODE+2(%r11) + st %r0,__PT_R2(%r11) + basr %r14,%r1 # call do_syscall_trace_enter cl %r2,BASED(.Lnr_syscalls) - bnl BASED(sysc_tracenogo) - lr %r7,%r2 - sll %r7,2 # svc number *4 - l %r8,0(%r7,%r10) + jnl sysc_tracenogo + lr %r8,%r2 + sll %r8,2 + l %r9,0(%r8,%r10) sysc_tracego: - lm %r3,%r6,SP_R3(%r15) - mvc SP_ARGS(4,%r15),SP_R7(%r15) - l %r2,SP_ORIG_R2(%r15) - basr %r14,%r8 # call sys_xxx - st %r2,SP_R2(%r15) # store return value + lm %r3,%r7,__PT_R3(%r11) + st %r7,STACK_FRAME_OVERHEAD(%r15) + l %r2,__PT_ORIG_GPR2(%r11) + basr %r14,%r9 # call sys_xxx + st %r2,__PT_R2(%r11) # store return value sysc_tracenogo: tm __TI_flags+2(%r12),_TIF_TRACE >> 8 - bz BASED(sysc_return) + jz sysc_return l %r1,BASED(.Ltrace_exit) - la %r2,SP_PTREGS(%r15) # load pt_regs + lr %r2,%r11 # pass pointer to pt_regs la %r14,BASED(sysc_return) - br %r1 + br %r1 # call do_syscall_trace_exit # # a new process exits the kernel with ret_from_fork # ENTRY(ret_from_fork) + la %r11,STACK_FRAME_OVERHEAD(%r15) + l %r12,__LC_THREAD_INFO l %r13,__LC_SVC_NEW_PSW+4 - l %r12,__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 + tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ? + jo 0f + st %r15,__PT_R15(%r11) # store stack pointer for new kthread +0: l %r1,BASED(.Lschedule_tail) + basr %r14,%r1 # call schedule_tail TRACE_IRQS_ON - stosm __SF_EMPTY(%r15),0x03 # reenable interrupts - b BASED(sysc_tracenogo) + ssm __LC_SVC_NEW_PSW # reenable interrupts + j sysc_tracenogo # # kernel_execve function needs to deal with pt_regs that is not @@ -390,153 +346,98 @@ ENTRY(kernel_execve) stm %r12,%r15,48(%r15) lr %r14,%r15 l %r13,__LC_SVC_NEW_PSW+4 - s %r15,BASED(.Lc_spsize) + ahi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) st %r14,__SF_BACKCHAIN(%r15) - la %r12,SP_PTREGS(%r15) + la %r12,STACK_FRAME_OVERHEAD(%r15) xc 0(__PT_SIZE,%r12),0(%r12) l %r1,BASED(.Ldo_execve) lr %r5,%r12 - basr %r14,%r1 + basr %r14,%r1 # call do_execve ltr %r2,%r2 - be BASED(0f) - a %r15,BASED(.Lc_spsize) + je 0f + ahi %r15,(STACK_FRAME_OVERHEAD + __PT_SIZE) lm %r12,%r15,48(%r15) br %r14 # execve succeeded. -0: stnsm __SF_EMPTY(%r15),0xfc # disable interrupts +0: ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts l %r15,__LC_KERNEL_STACK # load ksp - s %r15,BASED(.Lc_spsize) # make room for registers & psw - mvc SP_PTREGS(__PT_SIZE,%r15),0(%r12) # copy pt_regs + ahi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) + la %r11,STACK_FRAME_OVERHEAD(%r15) + mvc 0(__PT_SIZE,%r11),0(%r12) # copy pt_regs l %r12,__LC_THREAD_INFO xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) - stosm __SF_EMPTY(%r15),0x03 # reenable interrupts + ssm __LC_SVC_NEW_PSW # reenable interrupts l %r1,BASED(.Lexecve_tail) - basr %r14,%r1 - b BASED(sysc_return) + basr %r14,%r1 # call execve_tail + j sysc_return /* * Program check handler routine */ ENTRY(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?). - */ stpt __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 - SAVE_ALL_PGM __LC_PGM_OLD_PSW,__LC_SAVE_AREA - CREATE_STACK_FRAME __LC_SAVE_AREA - 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 ? - bz BASED(pgm_no_vtime) - 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 -pgm_no_vtime: - l %r3,__LC_PGM_ILC # load program interruption code - l %r4,__LC_TRANS_EXC_CODE - REENABLE_IRQS - la %r8,0x7f - nr %r8,%r3 - sll %r8,2 - l %r1,BASED(.Ljump_table) - l %r1,0(%r8,%r1) # load address of handler routine - la %r2,SP_PTREGS(%r15) # address of register-save area - basr %r14,%r1 # branch to interrupt-handler -pgm_exit: - b BASED(sysc_return) - -# -# 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 %r12,%r15,__LC_SAVE_AREA - lpsw 0x28 - -# -# Normal per exception -# -pgm_per_std: - SAVE_ALL_PGM __LC_PGM_OLD_PSW,__LC_SAVE_AREA - CREATE_STACK_FRAME __LC_SAVE_AREA - 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 ? - bz BASED(pgm_no_vtime2) - 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 -pgm_no_vtime2: + stm %r8,%r15,__LC_SAVE_AREA_SYNC + l %r12,__LC_THREAD_INFO + l %r13,__LC_SVC_NEW_PSW+4 + lm %r8,%r9,__LC_PGM_OLD_PSW + tmh %r8,0x0001 # test problem state bit + jnz 1f # -> fault in user space + tmh %r8,0x4000 # PER bit set in old PSW ? + jnz 0f # -> enabled, can't be a double fault + tm __LC_PGM_ILC+3,0x80 # check for per exception + jnz pgm_svcper # -> single stepped svc +0: CHECK_STACK STACK_SIZE,__LC_SAVE_AREA_SYNC + j 2f +1: UPDATE_VTIME %r14,%r15,__LC_SYNC_ENTER_TIMER + l %r15,__LC_KERNEL_STACK +2: ahi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) + la %r11,STACK_FRAME_OVERHEAD(%r15) + stm %r0,%r7,__PT_R0(%r11) + mvc __PT_R8(32,%r11),__LC_SAVE_AREA_SYNC + stm %r8,%r9,__PT_PSW(%r11) + mvc __PT_INT_CODE(4,%r11),__LC_PGM_ILC + mvc __PT_INT_PARM_LONG(4,%r11),__LC_TRANS_EXC_CODE + tm __LC_PGM_ILC+3,0x80 # check for per exception + jz 0f l %r1,__TI_task(%r12) - tm SP_PSW+1(%r15),0x01 # kernel per event ? - bz BASED(kernel_per) - mvc __THREAD_per_cause(2,%r1),__LC_PER_CAUSE + tmh %r8,0x0001 # kernel per event ? + jz pgm_kprobe + oi __TI_flags+3(%r12),_TIF_PER_TRAP mvc __THREAD_per_address(4,%r1),__LC_PER_ADDRESS + mvc __THREAD_per_cause(2,%r1),__LC_PER_CAUSE mvc __THREAD_per_paid(1,%r1),__LC_PER_PAID - oi __TI_flags+3(%r12),_TIF_PER_TRAP # set TIF_PER_TRAP - l %r3,__LC_PGM_ILC # load program interruption code - l %r4,__LC_TRANS_EXC_CODE - REENABLE_IRQS - la %r8,0x7f - nr %r8,%r3 # clear per-event-bit and ilc - be BASED(pgm_exit2) # only per or per+check ? - sll %r8,2 +0: REENABLE_IRQS + xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) l %r1,BASED(.Ljump_table) - l %r1,0(%r8,%r1) # load address of handler routine - la %r2,SP_PTREGS(%r15) # address of register-save area + la %r10,0x7f + n %r10,__PT_INT_CODE(%r11) + je sysc_return + sll %r10,2 + l %r1,0(%r10,%r1) # load address of handler routine + lr %r2,%r11 # pass pointer to pt_regs basr %r14,%r1 # branch to interrupt-handler -pgm_exit2: - b BASED(sysc_return) + j sysc_return # -# it was a single stepped SVC that is causing all the trouble +# PER event in supervisor state, must be kprobes # -pgm_svcper: - SAVE_ALL_PGM __LC_SVC_OLD_PSW,__LC_SAVE_AREA - CREATE_STACK_FRAME __LC_SAVE_AREA - 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 - l %r8,__TI_task(%r12) - 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 - stosm __SF_EMPTY(%r15),0x03 # reenable interrupts - lm %r2,%r6,SP_R2(%r15) # load svc arguments - b BASED(sysc_do_svc) +pgm_kprobe: + REENABLE_IRQS + xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) + l %r1,BASED(.Ldo_per_trap) + lr %r2,%r11 # pass pointer to pt_regs + basr %r14,%r1 # call do_per_trap + j sysc_return # -# per was called from kernel, must be kprobes +# single stepped system call # -kernel_per: - REENABLE_IRQS - 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 - b BASED(pgm_exit) +pgm_svcper: + oi __TI_flags+3(%r12),_TIF_PER_TRAP + mvc __LC_RETURN_PSW(4),__LC_SVC_NEW_PSW + mvc __LC_RETURN_PSW+4(4),BASED(.Lsysc_per) + lpsw __LC_RETURN_PSW # branch to sysc_per and enable irqs /* * IO interrupt handler routine @@ -545,28 +446,35 @@ kernel_per: ENTRY(io_int_handler) stck __LC_INT_CLOCK stpt __LC_ASYNC_ENTER_TIMER - SAVE_ALL_ASYNC __LC_IO_OLD_PSW,__LC_SAVE_AREA+16 - CREATE_STACK_FRAME __LC_SAVE_AREA+16 - mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack - l %r12,__LC_THREAD_INFO # load pointer to thread_info struct - tm SP_PSW+1(%r15),0x01 # interrupting from user ? - bz BASED(io_no_vtime) - UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER - UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER - mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER -io_no_vtime: + stm %r8,%r15,__LC_SAVE_AREA_ASYNC + l %r12,__LC_THREAD_INFO + l %r13,__LC_SVC_NEW_PSW+4 + lm %r8,%r9,__LC_IO_OLD_PSW + tmh %r8,0x0001 # interrupting from user ? + jz io_skip + UPDATE_VTIME %r14,%r15,__LC_ASYNC_ENTER_TIMER +io_skip: + SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT + stm %r0,%r7,__PT_R0(%r11) + mvc __PT_R8(32,%r11),__LC_SAVE_AREA_ASYNC + stm %r8,%r9,__PT_PSW(%r11) 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 + xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) + l %r1,BASED(.Ldo_IRQ) + lr %r2,%r11 # pass pointer to pt_regs + basr %r14,%r1 # call do_IRQ io_return: LOCKDEP_SYS_EXIT TRACE_IRQS_ON io_tif: tm __TI_flags+3(%r12),_TIF_WORK_INT - bnz BASED(io_work) # there is work to do (signals etc.) + jnz io_work # there is work to do (signals etc.) io_restore: - RESTORE_ALL __LC_RETURN_PSW,0 + mvc __LC_RETURN_PSW(8),__PT_PSW(%r11) + ni __LC_RETURN_PSW+1,0xfd # clean wait state bit + stpt __LC_EXIT_TIMER + lm %r0,%r15,__PT_R0(%r11) + lpsw __LC_RETURN_PSW io_done: # @@ -577,28 +485,29 @@ io_done: # Before any work can be done, a switch to the kernel stack is required. # io_work: - tm SP_PSW+1(%r15),0x01 # returning to user ? - bo BASED(io_work_user) # yes -> do resched & signal + tm __PT_PSW+1(%r11),0x01 # returning to user ? + jo io_work_user # yes -> do resched & signal #ifdef CONFIG_PREEMPT # check for preemptive scheduling icm %r0,15,__TI_precount(%r12) - bnz BASED(io_restore) # preemption disabled + jnz io_restore # preemption disabled tm __TI_flags+3(%r12),_TIF_NEED_RESCHED - bno BASED(io_restore) + jno io_restore # switch to kernel stack - 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 + l %r1,__PT_R15(%r11) + ahi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE) + mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) + xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) + la %r11,STACK_FRAME_OVERHEAD(%r1) lr %r15,%r1 # TRACE_IRQS_ON already done at io_return, call # TRACE_IRQS_OFF to keep things symmetrical TRACE_IRQS_OFF - l %r1,BASED(.Lpreempt_schedule_irq) + l %r1,BASED(.Lpreempt_irq) basr %r14,%r1 # call preempt_schedule_irq - b BASED(io_return) + j io_return #else - b BASED(io_restore) + j io_restore #endif # @@ -606,9 +515,10 @@ io_work: # io_work_user: 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 + ahi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE) + mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) + xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) + la %r11,STACK_FRAME_OVERHEAD(%r1) lr %r15,%r1 # @@ -618,24 +528,24 @@ io_work_user: # io_work_tif: tm __TI_flags+3(%r12),_TIF_MCCK_PENDING - bo BASED(io_mcck_pending) + jo io_mcck_pending tm __TI_flags+3(%r12),_TIF_NEED_RESCHED - bo BASED(io_reschedule) + jo io_reschedule tm __TI_flags+3(%r12),_TIF_SIGPENDING - bo BASED(io_sigpending) + jo io_sigpending tm __TI_flags+3(%r12),_TIF_NOTIFY_RESUME - bo BASED(io_notify_resume) - b BASED(io_return) # beware of critical section cleanup + jo io_notify_resume + j io_return # beware of critical section cleanup # # _TIF_MCCK_PENDING is set, call handler # io_mcck_pending: # TRACE_IRQS_ON already done at io_return - l %r1,BASED(.Ls390_handle_mcck) + l %r1,BASED(.Lhandle_mcck) basr %r14,%r1 # TIF bit will be cleared by handler TRACE_IRQS_OFF - b BASED(io_return) + j io_return # # _TIF_NEED_RESCHED is set, call schedule @@ -643,37 +553,37 @@ io_mcck_pending: io_reschedule: # TRACE_IRQS_ON already done at io_return l %r1,BASED(.Lschedule) - stosm __SF_EMPTY(%r15),0x03 # reenable interrupts + ssm __LC_SVC_NEW_PSW # reenable interrupts basr %r14,%r1 # call scheduler - stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts + ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts TRACE_IRQS_OFF - b BASED(io_return) + j io_return # # _TIF_SIGPENDING is set, call do_signal # io_sigpending: # TRACE_IRQS_ON already done at io_return - stosm __SF_EMPTY(%r15),0x03 # reenable interrupts - la %r2,SP_PTREGS(%r15) # load pt_regs l %r1,BASED(.Ldo_signal) + ssm __LC_SVC_NEW_PSW # reenable interrupts + lr %r2,%r11 # pass pointer to pt_regs basr %r14,%r1 # call do_signal - stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts + ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts TRACE_IRQS_OFF - b BASED(io_return) + j io_return # # _TIF_SIGPENDING is set, call do_signal # io_notify_resume: # TRACE_IRQS_ON already done at io_return - stosm __SF_EMPTY(%r15),0x03 # reenable interrupts - la %r2,SP_PTREGS(%r15) # load pt_regs l %r1,BASED(.Ldo_notify_resume) - basr %r14,%r1 # call do_signal - stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts + ssm __LC_SVC_NEW_PSW # reenable interrupts + lr %r2,%r11 # pass pointer to pt_regs + basr %r14,%r1 # call do_notify_resume + ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts TRACE_IRQS_OFF - b BASED(io_return) + j io_return /* * External interrupt handler routine @@ -682,23 +592,25 @@ io_notify_resume: ENTRY(ext_int_handler) stck __LC_INT_CLOCK stpt __LC_ASYNC_ENTER_TIMER - SAVE_ALL_ASYNC __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16 - CREATE_STACK_FRAME __LC_SAVE_AREA+16 - mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack - l %r12,__LC_THREAD_INFO # load pointer to thread_info struct - tm SP_PSW+1(%r15),0x01 # interrupting from user ? - bz BASED(ext_no_vtime) - UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER - UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER - mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER -ext_no_vtime: + stm %r8,%r15,__LC_SAVE_AREA_ASYNC + l %r12,__LC_THREAD_INFO + l %r13,__LC_SVC_NEW_PSW+4 + lm %r8,%r9,__LC_EXT_OLD_PSW + tmh %r8,0x0001 # interrupting from user ? + jz ext_skip + UPDATE_VTIME %r14,%r15,__LC_ASYNC_ENTER_TIMER +ext_skip: + SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT + stm %r0,%r7,__PT_R0(%r11) + mvc __PT_R8(32,%r11),__LC_SAVE_AREA_ASYNC + stm %r8,%r9,__PT_PSW(%r11) TRACE_IRQS_OFF - la %r2,SP_PTREGS(%r15) # address of register-save area + lr %r2,%r11 # pass pointer to pt_regs l %r3,__LC_CPU_ADDRESS # get cpu address + interruption code l %r4,__LC_EXT_PARAMS # get external parameters l %r1,BASED(.Ldo_extint) - basr %r14,%r1 - b BASED(io_return) + basr %r14,%r1 # call do_extint + j io_return __critical_end: @@ -710,82 +622,74 @@ ENTRY(mcck_int_handler) stck __LC_MCCK_CLOCK 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 + l %r12,__LC_THREAD_INFO + l %r13,__LC_SVC_NEW_PSW+4 + lm %r8,%r9,__LC_MCK_OLD_PSW tm __LC_MCCK_CODE,0x80 # system damage? - bo BASED(mcck_int_main) # yes -> rest of mcck code invalid - mvc __LC_MCCK_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA + jo mcck_panic # yes -> rest of mcck code invalid + la %r14,__LC_CPU_TIMER_SAVE_AREA + mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid? - bo BASED(1f) + jo 3f la %r14,__LC_SYNC_ENTER_TIMER clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER - bl BASED(0f) + jl 0f la %r14,__LC_ASYNC_ENTER_TIMER 0: clc 0(8,%r14),__LC_EXIT_TIMER - bl BASED(0f) + jl 1f la %r14,__LC_EXIT_TIMER -0: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER - bl BASED(0f) +1: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER + jl 2f la %r14,__LC_LAST_UPDATE_TIMER -0: spt 0(%r14) +2: spt 0(%r14) mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) -1: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid? - bno BASED(mcck_int_main) # no -> skip cleanup critical - tm __LC_MCK_OLD_PSW+1,0x01 # test problem state bit - bnz BASED(mcck_int_main) # from user -> load async stack - clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_end) - bhe BASED(mcck_int_main) - clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_start) - bl BASED(mcck_int_main) - l %r14,BASED(.Lcleanup_critical) - basr %r14,%r14 -mcck_int_main: - l %r14,__LC_PANIC_STACK # are we already on the panic stack? - slr %r14,%r15 - sra %r14,PAGE_SHIFT - be BASED(0f) - l %r15,__LC_PANIC_STACK # load panic stack -0: s %r15,BASED(.Lc_spsize) # make room for registers & psw - CREATE_STACK_FRAME __LC_SAVE_AREA+32 - mvc SP_PSW(8,%r15),0(%r12) - l %r12,__LC_THREAD_INFO # load pointer to thread_info struct - 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) - UPDATE_VTIME __LC_EXIT_TIMER,__LC_MCCK_ENTER_TIMER,__LC_USER_TIMER - UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER - mvc __LC_LAST_UPDATE_TIMER(8),__LC_MCCK_ENTER_TIMER -mcck_no_vtime: - 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 ? - bno BASED(mcck_return) +3: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid? + jno mcck_panic # no -> skip cleanup critical + tm %r8,0x0001 # interrupting from user ? + jz mcck_skip + UPDATE_VTIME %r14,%r15,__LC_MCCK_ENTER_TIMER +mcck_skip: + SWITCH_ASYNC __LC_GPREGS_SAVE_AREA+32,__LC_PANIC_STACK,PAGE_SHIFT + mvc __PT_R0(64,%r11),__LC_GPREGS_SAVE_AREA + stm %r8,%r9,__PT_PSW(%r11) + xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) + l %r1,BASED(.Ldo_machine_check) + lr %r2,%r11 # pass pointer to pt_regs + basr %r14,%r1 # call s390_do_machine_check + tm __PT_PSW+1(%r11),0x01 # returning to user ? + jno mcck_return 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 + ahi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE) + mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) + xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) + la %r11,STACK_FRAME_OVERHEAD(%r15) lr %r15,%r1 - stosm __SF_EMPTY(%r15),0x04 # turn dat on + ssm __LC_PGM_NEW_PSW # turn dat on, keep irqs off tm __TI_flags+3(%r12),_TIF_MCCK_PENDING - bno BASED(mcck_return) + jno mcck_return TRACE_IRQS_OFF - l %r1,BASED(.Ls390_handle_mcck) - basr %r14,%r1 # call machine check handler + l %r1,BASED(.Lhandle_mcck) + basr %r14,%r1 # call s390_handle_mcck TRACE_IRQS_ON mcck_return: - mvc __LC_RETURN_MCCK_PSW(8),SP_PSW(%r15) # move return PSW + mvc __LC_RETURN_MCCK_PSW(8),__PT_PSW(%r11) # move return PSW ni __LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? - bno BASED(0f) - lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 + jno 0f + lm %r0,%r15,__PT_R0(%r11) stpt __LC_EXIT_TIMER - lpsw __LC_RETURN_MCCK_PSW # back to caller -0: lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 - lpsw __LC_RETURN_MCCK_PSW # back to caller + lpsw __LC_RETURN_MCCK_PSW +0: lm %r0,%r15,__PT_R0(%r11) + lpsw __LC_RETURN_MCCK_PSW - RESTORE_ALL __LC_RETURN_MCCK_PSW,0 +mcck_panic: + l %r14,__LC_PANIC_STACK + slr %r14,%r15 + sra %r14,PAGE_SHIFT + jz 0f + l %r15,__LC_PANIC_STACK +0: ahi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) + j mcck_skip /* * Restart interruption handler, kick starter for additional CPUs @@ -799,18 +703,18 @@ restart_base: stck __LC_LAST_UPDATE_CLOCK mvc __LC_LAST_UPDATE_TIMER(8),restart_vtime-restart_base(%r1) mvc __LC_EXIT_TIMER(8),restart_vtime-restart_base(%r1) - l %r15,__LC_SAVE_AREA+60 # load ksp + l %r15,__LC_GPREGS_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 + lm %r6,%r15,__SF_GPRS(%r15)# load registers from clone l %r1,__LC_THREAD_INFO mvc __LC_USER_TIMER(8),__TI_user_timer(%r1) mvc __LC_SYSTEM_TIMER(8),__TI_system_timer(%r1) xc __LC_STEAL_TIMER(8),__LC_STEAL_TIMER - stosm __SF_EMPTY(%r15),0x04 # now we can turn dat on + ssm __LC_PGM_NEW_PSW # turn dat on, keep irqs off basr %r14,0 l %r14,restart_addr-.(%r14) - basr %r14,%r14 # branch to start_secondary + basr %r14,%r14 # call start_secondary restart_addr: .long start_secondary .align 8 @@ -835,19 +739,19 @@ restart_go: # PSW restart interrupt handler # ENTRY(psw_restart_int_handler) - st %r15,__LC_SAVE_AREA+48(%r0) # save r15 + st %r15,__LC_SAVE_AREA_RESTART 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+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 + ahi %r15,-__PT_SIZE # create pt_regs on stack + stm %r0,%r14,__PT_R0(%r15) + mvc __PT_R15(4,%r15),__LC_SAVE_AREA_RESTART + mvc __PT_PSW(8,%r15),__LC_RST_OLD_PSW # store restart old psw + ahi %r15,-STACK_FRAME_OVERHEAD + xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) basr %r14,0 1: l %r14,.Ldo_restart-1b(%r14) basr %r14,%r14 - basr %r14,0 # load disabled wait PSW if 2: lpsw restart_psw_crash-2b(%r14) # do_restart returns .align 4 @@ -869,215 +773,174 @@ restart_psw_crash: */ stack_overflow: l %r15,__LC_PANIC_STACK # change to panic stack - sl %r15,BASED(.Lc_spsize) - mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack - stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack - la %r1,__LC_SAVE_AREA - ch %r12,BASED(.L0x020) # old psw addr == __LC_SVC_OLD_PSW ? - be BASED(0f) - ch %r12,BASED(.L0x028) # old psw addr == __LC_PGM_OLD_PSW ? - 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 - l %r1,BASED(1f) # branch to kernel_stack_overflow - la %r2,SP_PTREGS(%r15) # load pt_regs - br %r1 + ahi %r15,-__PT_SIZE # create pt_regs + stm %r0,%r7,__PT_R0(%r15) + stm %r8,%r9,__PT_PSW(%r15) + mvc __PT_R8(32,%r11),0(%r14) + lr %r15,%r11 + ahi %r15,-STACK_FRAME_OVERHEAD + l %r1,BASED(1f) + xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) + lr %r2,%r11 # pass pointer to pt_regs + br %r1 # branch to kernel_stack_overflow 1: .long kernel_stack_overflow #endif -cleanup_table_system_call: - .long system_call + 0x80000000, sysc_do_svc + 0x80000000 -cleanup_table_sysc_tif: - .long sysc_tif + 0x80000000, sysc_restore + 0x80000000 -cleanup_table_sysc_restore: - .long sysc_restore + 0x80000000, sysc_done + 0x80000000 -cleanup_table_io_tif: - .long io_tif + 0x80000000, io_restore + 0x80000000 -cleanup_table_io_restore: - .long io_restore + 0x80000000, io_done + 0x80000000 +cleanup_table: + .long system_call + 0x80000000 + .long sysc_do_svc + 0x80000000 + .long sysc_tif + 0x80000000 + .long sysc_restore + 0x80000000 + .long sysc_done + 0x80000000 + .long io_tif + 0x80000000 + .long io_restore + 0x80000000 + .long io_done + 0x80000000 cleanup_critical: - clc 4(4,%r12),BASED(cleanup_table_system_call) - bl BASED(0f) - clc 4(4,%r12),BASED(cleanup_table_system_call+4) - bl BASED(cleanup_system_call) -0: - clc 4(4,%r12),BASED(cleanup_table_sysc_tif) - bl BASED(0f) - clc 4(4,%r12),BASED(cleanup_table_sysc_tif+4) - bl BASED(cleanup_sysc_tif) -0: - clc 4(4,%r12),BASED(cleanup_table_sysc_restore) - bl BASED(0f) - clc 4(4,%r12),BASED(cleanup_table_sysc_restore+4) - bl BASED(cleanup_sysc_restore) -0: - clc 4(4,%r12),BASED(cleanup_table_io_tif) - bl BASED(0f) - clc 4(4,%r12),BASED(cleanup_table_io_tif+4) - bl BASED(cleanup_io_tif) -0: - clc 4(4,%r12),BASED(cleanup_table_io_restore) - bl BASED(0f) - clc 4(4,%r12),BASED(cleanup_table_io_restore+4) - bl BASED(cleanup_io_restore) -0: - br %r14 + cl %r9,BASED(cleanup_table) # system_call + jl 0f + cl %r9,BASED(cleanup_table+4) # sysc_do_svc + jl cleanup_system_call + cl %r9,BASED(cleanup_table+8) # sysc_tif + jl 0f + cl %r9,BASED(cleanup_table+12) # sysc_restore + jl cleanup_sysc_tif + cl %r9,BASED(cleanup_table+16) # sysc_done + jl cleanup_sysc_restore + cl %r9,BASED(cleanup_table+20) # io_tif + jl 0f + cl %r9,BASED(cleanup_table+24) # io_restore + jl cleanup_io_tif + cl %r9,BASED(cleanup_table+28) # io_done + jl cleanup_io_restore +0: br %r14 cleanup_system_call: - mvc __LC_RETURN_PSW(8),0(%r12) - clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+4) - bh BASED(0f) - mvc __LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER - c %r12,BASED(.Lmck_old_psw) - be BASED(0f) + # check if stpt has been executed + cl %r9,BASED(cleanup_system_call_insn) + jh 0f mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER -0: c %r12,BASED(.Lmck_old_psw) - la %r12,__LC_SAVE_AREA+32 - be BASED(0f) - la %r12,__LC_SAVE_AREA+16 -0: clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+8) - bhe BASED(cleanup_vtime) - clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn) - bh BASED(0f) - mvc __LC_SAVE_AREA(16),0(%r12) -0: st %r13,4(%r12) - l %r15,__LC_KERNEL_STACK # problem state -> load ksp - s %r15,BASED(.Lc_spsize) # make room for registers & psw - st %r15,12(%r12) - CREATE_STACK_FRAME __LC_SAVE_AREA - 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) - UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER -cleanup_stime: - clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+16) - bh BASED(cleanup_update) - UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER -cleanup_update: + chi %r11,__LC_SAVE_AREA_ASYNC + je 0f + mvc __LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER +0: # check if stm has been executed + cl %r9,BASED(cleanup_system_call_insn+4) + jh 0f + mvc __LC_SAVE_AREA_SYNC(32),0(%r11) +0: # set up saved registers r12, and r13 + st %r12,16(%r11) # r12 thread-info pointer + st %r13,20(%r11) # r13 literal-pool pointer + # check if the user time calculation has been done + cl %r9,BASED(cleanup_system_call_insn+8) + jh 0f + l %r10,__LC_EXIT_TIMER + l %r15,__LC_EXIT_TIMER+4 + SUB64 %r10,%r15,__LC_SYNC_ENTER_TIMER + ADD64 %r10,%r15,__LC_USER_TIMER + st %r10,__LC_USER_TIMER + st %r15,__LC_USER_TIMER+4 +0: # check if the system time calculation has been done + cl %r9,BASED(cleanup_system_call_insn+12) + jh 0f + l %r10,__LC_LAST_UPDATE_TIMER + l %r15,__LC_LAST_UPDATE_TIMER+4 + SUB64 %r10,%r15,__LC_EXIT_TIMER + ADD64 %r10,%r15,__LC_SYSTEM_TIMER + st %r10,__LC_SYSTEM_TIMER + st %r15,__LC_SYSTEM_TIMER+4 +0: # update accounting time stamp mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER - mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_system_call+4) - la %r12,__LC_RETURN_PSW + # set up saved register 11 + l %r15,__LC_KERNEL_STACK + ahi %r15,-__PT_SIZE + st %r15,12(%r11) # r11 pt_regs pointer + # fill pt_regs + mvc __PT_R8(32,%r15),__LC_SAVE_AREA_SYNC + stm %r0,%r7,__PT_R0(%r15) + mvc __PT_PSW(8,%r15),__LC_SVC_OLD_PSW + mvc __PT_INT_CODE(4,%r15),__LC_SVC_ILC + # setup saved register 15 + ahi %r15,-STACK_FRAME_OVERHEAD + st %r15,28(%r11) # r15 stack pointer + # set new psw address and exit + l %r9,BASED(cleanup_table+4) # sysc_do_svc + 0x80000000 br %r14 cleanup_system_call_insn: - .long sysc_saveall + 0x80000000 .long system_call + 0x80000000 - .long sysc_vtime + 0x80000000 - .long sysc_stime + 0x80000000 - .long sysc_update + 0x80000000 + .long sysc_stm + 0x80000000 + .long sysc_vtime + 0x80000000 + 36 + .long sysc_vtime + 0x80000000 + 76 cleanup_sysc_tif: - mvc __LC_RETURN_PSW(4),0(%r12) - mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_sysc_tif) - la %r12,__LC_RETURN_PSW + l %r9,BASED(cleanup_table+8) # sysc_tif + 0x80000000 br %r14 cleanup_sysc_restore: - clc 4(4,%r12),BASED(cleanup_sysc_restore_insn) - be BASED(2f) - mvc __LC_EXIT_TIMER(8),__LC_MCCK_ENTER_TIMER - c %r12,BASED(.Lmck_old_psw) - be BASED(0f) - mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER -0: clc 4(4,%r12),BASED(cleanup_sysc_restore_insn+4) - be BASED(2f) - mvc __LC_RETURN_PSW(8),SP_PSW(%r15) - c %r12,BASED(.Lmck_old_psw) - la %r12,__LC_SAVE_AREA+32 - be BASED(1f) - la %r12,__LC_SAVE_AREA+16 -1: mvc 0(16,%r12),SP_R12(%r15) - lm %r0,%r11,SP_R0(%r15) - l %r15,SP_R15(%r15) -2: la %r12,__LC_RETURN_PSW + cl %r9,BASED(cleanup_sysc_restore_insn) + jhe 0f + l %r9,12(%r11) # get saved pointer to pt_regs + mvc __LC_RETURN_PSW(8),__PT_PSW(%r9) + mvc 0(32,%r11),__PT_R8(%r9) + lm %r0,%r7,__PT_R0(%r9) +0: lm %r8,%r9,__LC_RETURN_PSW br %r14 cleanup_sysc_restore_insn: .long sysc_done - 4 + 0x80000000 - .long sysc_done - 8 + 0x80000000 cleanup_io_tif: - mvc __LC_RETURN_PSW(4),0(%r12) - mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_io_tif) - la %r12,__LC_RETURN_PSW + l %r9,BASED(cleanup_table+20) # io_tif + 0x80000000 br %r14 cleanup_io_restore: - clc 4(4,%r12),BASED(cleanup_io_restore_insn) - be BASED(1f) - mvc __LC_EXIT_TIMER(8),__LC_MCCK_ENTER_TIMER - clc 4(4,%r12),BASED(cleanup_io_restore_insn+4) - be BASED(1f) - mvc __LC_RETURN_PSW(8),SP_PSW(%r15) - mvc __LC_SAVE_AREA+32(16),SP_R12(%r15) - lm %r0,%r11,SP_R0(%r15) - l %r15,SP_R15(%r15) -1: la %r12,__LC_RETURN_PSW + cl %r9,BASED(cleanup_io_restore_insn) + jhe 0f + l %r9,12(%r11) # get saved r11 pointer to pt_regs + mvc __LC_RETURN_PSW(8),__PT_PSW(%r9) + ni __LC_RETURN_PSW+1,0xfd # clear wait state bit + mvc 0(32,%r11),__PT_R8(%r9) + lm %r0,%r7,__PT_R0(%r9) +0: lm %r8,%r9,__LC_RETURN_PSW br %r14 cleanup_io_restore_insn: .long io_done - 4 + 0x80000000 - .long io_done - 8 + 0x80000000 /* * Integer constants */ - .align 4 -.Lc_spsize: .long SP_SIZE -.Lc_overhead: .long STACK_FRAME_OVERHEAD -.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 +.Lnr_syscalls: .long NR_syscalls /* * Symbol constants */ -.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 -.Ldo_notify_resume: - .long do_notify_resume -.Lhandle_per: .long do_per_trap -.Ldo_execve: .long do_execve -.Lexecve_tail: .long execve_tail -.Ljump_table: .long pgm_check_table -.Lschedule: .long schedule +.Ldo_machine_check: .long s390_do_machine_check +.Lhandle_mcck: .long s390_handle_mcck +.Ldo_IRQ: .long do_IRQ +.Ldo_extint: .long do_extint +.Ldo_signal: .long do_signal +.Ldo_notify_resume: .long do_notify_resume +.Ldo_per_trap: .long do_per_trap +.Ldo_execve: .long do_execve +.Lexecve_tail: .long execve_tail +.Ljump_table: .long pgm_check_table +.Lschedule: .long schedule #ifdef CONFIG_PREEMPT -.Lpreempt_schedule_irq: - .long preempt_schedule_irq +.Lpreempt_irq: .long preempt_schedule_irq #endif -.Ltrace_entry: .long do_syscall_trace_enter -.Ltrace_exit: .long do_syscall_trace_exit -.Lschedtail: .long schedule_tail -.Lsysc_table: .long sys_call_table +.Ltrace_enter: .long do_syscall_trace_enter +.Ltrace_exit: .long do_syscall_trace_exit +.Lschedule_tail: .long schedule_tail +.Lsys_call_table: .long sys_call_table +.Lsysc_per: .long sysc_per + 0x80000000 #ifdef CONFIG_TRACE_IRQFLAGS -.Ltrace_irq_on_caller: - .long trace_hardirqs_on_caller -.Ltrace_irq_off_caller: - .long trace_hardirqs_off_caller +.Lhardirqs_on: .long trace_hardirqs_on_caller +.Lhardirqs_off: .long trace_hardirqs_off_caller #endif #ifdef CONFIG_LOCKDEP -.Llockdep_sys_exit: - .long lockdep_sys_exit +.Llockdep_sys_exit: .long lockdep_sys_exit #endif -.Lcritical_start: - .long __critical_start + 0x80000000 -.Lcritical_end: - .long __critical_end + 0x80000000 -.Lcleanup_critical: - .long cleanup_critical +.Lcritical_start: .long __critical_start + 0x80000000 +.Lcritical_length: .long __critical_end - __critical_start .section .rodata, "a" #define SYSCALL(esa,esame,emu) .long esa |