diff options
Diffstat (limited to 'arch/s390/kernel/entry64.S')
| -rw-r--r-- | arch/s390/kernel/entry64.S | 968 |
1 files changed, 429 insertions, 539 deletions
diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S index 130fb02305c..73845a9e587 100644 --- a/arch/s390/kernel/entry64.S +++ b/arch/s390/kernel/entry64.S @@ -1,3 +1,4 @@ + /* * arch/s390/kernel/entry64.S * S390 low-level entry points. @@ -19,32 +20,22 @@ #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 + 8 -SP_R2 = STACK_FRAME_OVERHEAD + __PT_GPRS + 16 -SP_R3 = STACK_FRAME_OVERHEAD + __PT_GPRS + 24 -SP_R4 = STACK_FRAME_OVERHEAD + __PT_GPRS + 32 -SP_R5 = STACK_FRAME_OVERHEAD + __PT_GPRS + 40 -SP_R6 = STACK_FRAME_OVERHEAD + __PT_GPRS + 48 -SP_R7 = STACK_FRAME_OVERHEAD + __PT_GPRS + 56 -SP_R8 = STACK_FRAME_OVERHEAD + __PT_GPRS + 64 -SP_R9 = STACK_FRAME_OVERHEAD + __PT_GPRS + 72 -SP_R10 = STACK_FRAME_OVERHEAD + __PT_GPRS + 80 -SP_R11 = STACK_FRAME_OVERHEAD + __PT_GPRS + 88 -SP_R12 = STACK_FRAME_OVERHEAD + __PT_GPRS + 96 -SP_R13 = STACK_FRAME_OVERHEAD + __PT_GPRS + 104 -SP_R14 = STACK_FRAME_OVERHEAD + __PT_GPRS + 112 -SP_R15 = STACK_FRAME_OVERHEAD + __PT_GPRS + 120 -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 + 8 +__PT_R2 = __PT_GPRS + 16 +__PT_R3 = __PT_GPRS + 24 +__PT_R4 = __PT_GPRS + 32 +__PT_R5 = __PT_GPRS + 40 +__PT_R6 = __PT_GPRS + 48 +__PT_R7 = __PT_GPRS + 56 +__PT_R8 = __PT_GPRS + 64 +__PT_R9 = __PT_GPRS + 72 +__PT_R10 = __PT_GPRS + 80 +__PT_R11 = __PT_GPRS + 88 +__PT_R12 = __PT_GPRS + 96 +__PT_R13 = __PT_GPRS + 104 +__PT_R14 = __PT_GPRS + 112 +__PT_R15 = __PT_GPRS + 120 STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER STACK_SIZE = 1 << STACK_SHIFT @@ -59,154 +50,103 @@ _TIF_EXIT_SIE = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING) #define BASED(name) name-system_call(%r13) - .macro SPP newpp -#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE) - tm __LC_MACHINE_FLAGS+6,0x20 # MACHINE_FLAG_SPP - jz .+8 - .insn s,0xb2800000,\newpp -#endif - .endm - - .macro HANDLE_SIE_INTERCEPT -#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE) - tm __TI_flags+6(%r12),_TIF_SIE>>8 - jz 0f - SPP BASED(.Lhost_id) # set host id - clc SP_PSW+8(8,%r15),BASED(.Lsie_loop) - jl 0f - clc SP_PSW+8(8,%r15),BASED(.Lsie_done) - jhe 0f - mvc SP_PSW+8(8,%r15),BASED(.Lsie_loop) -0: -#endif - .endm - -#ifdef CONFIG_TRACE_IRQFLAGS .macro TRACE_IRQS_ON +#ifdef CONFIG_TRACE_IRQFLAGS basr %r2,%r0 brasl %r14,trace_hardirqs_on_caller +#endif .endm .macro TRACE_IRQS_OFF +#ifdef CONFIG_TRACE_IRQFLAGS basr %r2,%r0 brasl %r14,trace_hardirqs_off_caller - .endm -#else -#define TRACE_IRQS_ON -#define TRACE_IRQS_OFF #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 brasl %r14,lockdep_sys_exit -0: - .endm -#else -#define LOCKDEP_SYS_EXIT #endif - - .macro UPDATE_VTIME lc_from,lc_to,lc_sum - lg %r10,\lc_from - slg %r10,\lc_to - alg %r10,\lc_sum - stg %r10,\lc_sum .endm -/* - * 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 SPP newpp +#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE) + tm __LC_MACHINE_FLAGS+6,0x20 # MACHINE_FLAG_SPP + jz .+8 + .insn s,0xb2800000,\newpp +#endif + .endm - .macro SAVE_ALL_SVC psworg,savearea - stmg %r11,%r15,\savearea - lg %r15,__LC_KERNEL_STACK # problem state -> load ksp - aghi %r15,-SP_SIZE # make room for registers & psw - lg %r11,__LC_LAST_BREAK + .macro HANDLE_SIE_INTERCEPT scratch +#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE) + tm __TI_flags+6(%r12),_TIF_SIE>>8 + jz .+42 + tm __LC_MACHINE_FLAGS+6,0x20 # MACHINE_FLAG_SPP + jz .+8 + .insn s,0xb2800000,BASED(.Lhost_id) # set host id + lgr \scratch,%r9 + slg \scratch,BASED(.Lsie_loop) + clg \scratch,BASED(.Lsie_length) + jhe .+10 + lg %r9,BASED(.Lsie_loop) +#endif .endm - .macro SAVE_ALL_PGM psworg,savearea - stmg %r11,%r15,\savearea - tm \psworg+1,0x01 # test problem state bit + .macro CHECK_STACK stacksize,savearea #ifdef CONFIG_CHECK_STACK - jnz 1f - tml %r15,STACK_SIZE - CONFIG_STACK_GUARD - jnz 2f - la %r12,\psworg - j stack_overflow -#else - jz 2f + tml %r15,\stacksize - CONFIG_STACK_GUARD + lghi %r14,\savearea + jz stack_overflow #endif -1: lg %r15,__LC_KERNEL_STACK # problem state -> load ksp -2: aghi %r15,-SP_SIZE # make room for registers & psw - larl %r13,system_call - lg %r11,__LC_LAST_BREAK .endm - .macro SAVE_ALL_ASYNC psworg,savearea - stmg %r11,%r15,\savearea - larl %r13,system_call - lg %r11,__LC_LAST_BREAK - la %r12,\psworg - tm \psworg+1,0x01 # test problem state bit - jnz 1f # from user -> load kernel stack - clc \psworg+8(8),BASED(.Lcritical_end) + .macro SWITCH_ASYNC savearea,stack,shift + tmhh %r8,0x0001 # interrupting from user ? + jnz 1f + lgr %r14,%r9 + slg %r14,BASED(.Lcritical_start) + clg %r14,BASED(.Lcritical_length) jhe 0f - clc \psworg+8(8),BASED(.Lcritical_start) - jl 0f + lghi %r11,\savearea # inside critical section, do cleanup brasl %r14,cleanup_critical - tm 1(%r12),0x01 # retest problem state after cleanup + tmhh %r8,0x0001 # retest problem state after cleanup jnz 1f -0: lg %r14,__LC_ASYNC_STACK # are we already on the async. stack ? +0: lg %r14,\stack # are we already on the target stack? slgr %r14,%r15 - srag %r14,%r14,STACK_SHIFT -#ifdef CONFIG_CHECK_STACK + srag %r14,%r14,\shift jnz 1f - tml %r15,STACK_SIZE - CONFIG_STACK_GUARD - jnz 2f - j stack_overflow -#else - jz 2f -#endif -1: lg %r15,__LC_ASYNC_STACK # load async stack -2: aghi %r15,-SP_SIZE # make room for registers & psw - .endm - - .macro CREATE_STACK_FRAME savearea - xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) - stg %r2,SP_ORIG_R2(%r15) # store original content of gpr 2 - mvc SP_R11(40,%r15),\savearea # move %r11-%r15 to stack - stmg %r0,%r10,SP_R0(%r15) # store gprs %r0-%r10 to kernel stack + CHECK_STACK 1<<\shift,\savearea + j 2f +1: lg %r15,\stack # load target stack +2: aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) + la %r11,STACK_FRAME_OVERHEAD(%r15) .endm - .macro RESTORE_ALL psworg,sync - mvc \psworg(16),SP_PSW(%r15) # move user PSW to lowcore - .if !\sync - ni \psworg+1,0xfd # clear wait state bit - .endif - lg %r14,__LC_VDSO_PER_CPU - lmg %r0,%r13,SP_R0(%r15) # load gprs 0-13 of user - stpt __LC_EXIT_TIMER - mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER - lmg %r14,%r15,SP_R14(%r15) # load grps 14-15 of user - lpswe \psworg # back to caller + .macro UPDATE_VTIME scratch,enter_timer + lg \scratch,__LC_EXIT_TIMER + slg \scratch,\enter_timer + alg \scratch,__LC_USER_TIMER + stg \scratch,__LC_USER_TIMER + lg \scratch,__LC_LAST_UPDATE_TIMER + slg \scratch,__LC_EXIT_TIMER + alg \scratch,__LC_SYSTEM_TIMER + stg \scratch,__LC_SYSTEM_TIMER + mvc __LC_LAST_UPDATE_TIMER(8),\enter_timer .endm - .macro LAST_BREAK - srag %r10,%r11,23 - jz 0f - stg %r11,__TI_last_break(%r12) -0: + .macro LAST_BREAK scratch + srag \scratch,%r10,23 + jz .+10 + stg %r10,__TI_last_break(%r12) .endm .macro REENABLE_IRQS - mvc __SF_EMPTY(1,%r15),SP_PSW(%r15) - ni __SF_EMPTY(%r15),0xbf - ssm __SF_EMPTY(%r15) + stg %r8,__LC_RETURN_PSW + ni __LC_RETURN_PSW,0xbf + ssm __LC_RETURN_PSW .endm .section .kprobes.text, "ax" @@ -245,55 +185,66 @@ __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 - lg %r12,__LC_THREAD_INFO # load pointer to thread_info struct - mvc SP_PSW(16,%r15),__LC_SVC_OLD_PSW - mvc SP_SVC_CODE(4,%r15),__LC_SVC_ILC - oi __TI_flags+7(%r12),_TIF_SYSCALL +sysc_stmg: + stmg %r8,%r15,__LC_SAVE_AREA_SYNC + lg %r10,__LC_LAST_BREAK + lg %r12,__LC_THREAD_INFO + larl %r13,system_call +sysc_per: + lg %r15,__LC_KERNEL_STACK + aghi %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 - LAST_BREAK + UPDATE_VTIME %r13,__LC_SYNC_ENTER_TIMER + LAST_BREAK %r13 + stmg %r0,%r7,__PT_R0(%r11) + mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC + mvc __PT_PSW(16,%r11),__LC_SVC_OLD_PSW + mvc __PT_SVC_CODE(4,%r11),__LC_SVC_ILC sysc_do_svc: - llgh %r7,SP_SVC_CODE+2(%r15) - slag %r7,%r7,2 # shift and test for svc 0 + oi __TI_flags+7(%r12),_TIF_SYSCALL + llgh %r8,__PT_SVC_CODE+2(%r11) + slag %r8,%r8,2 # shift and test for svc 0 jnz sysc_nr_ok # svc 0: system call number in %r1 - llgfr %r1,%r1 # clear high word in r1 + llgfr %r1,%r1 # clear high word in r1 cghi %r1,NR_syscalls jnl sysc_nr_ok - sth %r1,SP_SVC_CODE+2(%r15) - slag %r7,%r1,2 # shift and test for svc 0 + sth %r1,__PT_SVC_CODE+2(%r11) + slag %r8,%r1,2 sysc_nr_ok: - larl %r10,sys_call_table + larl %r10,sys_call_table # 64 bit system call table #ifdef CONFIG_COMPAT - tm __TI_flags+5(%r12),(_TIF_31BIT>>16) # running in 31 bit mode ? + tm __TI_flags+5(%r12),(_TIF_31BIT>>16) jno sysc_noemu - larl %r10,sys_call_table_emu # use 31 bit emulation system calls + larl %r10,sys_call_table_emu # 31 bit system call table sysc_noemu: #endif + xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) + stg %r2,__PT_ORIG_GPR2(%r11) + stg %r7,STACK_FRAME_OVERHEAD(%r15) + lgf %r9,0(%r8,%r10) # get system call add. tm __TI_flags+6(%r12),_TIF_TRACE >> 8 - mvc SP_ARGS(8,%r15),SP_R7(%r15) - lgf %r8,0(%r7,%r10) # load address of system call routine jnz sysc_tracesys - basr %r14,%r8 # call sys_xxxx - stg %r2,SP_R2(%r15) # store return value (change R2 on stack) + basr %r14,%r9 # call sys_xxxx + stg %r2,__PT_R2(%r11) # store return value sysc_return: LOCKDEP_SYS_EXIT sysc_tif: - tm SP_PSW+1(%r15),0x01 # returning to user ? + tm __PT_PSW+1(%r11),0x01 # returning to user ? jno sysc_restore tm __TI_flags+7(%r12),_TIF_WORK_SVC - jnz sysc_work # there is work to do (signals etc.) + jnz sysc_work # check for work ni __TI_flags+7(%r12),255-_TIF_SYSCALL sysc_restore: - RESTORE_ALL __LC_RETURN_PSW,1 + lg %r14,__LC_VDSO_PER_CPU + lmg %r0,%r10,__PT_R0(%r11) + mvc __LC_RETURN_PSW(16),__PT_PSW(%r11) + stpt __LC_EXIT_TIMER + mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER + lmg %r11,%r15,__PT_R11(%r11) + lpswe __LC_RETURN_PSW sysc_done: # @@ -317,7 +268,7 @@ sysc_work: # sysc_reschedule: larl %r14,sysc_return - jg schedule # return point is sysc_return + jg schedule # # _TIF_MCCK_PENDING is set, call handler @@ -331,33 +282,33 @@ sysc_mcck_pending: # sysc_sigpending: ni __TI_flags+7(%r12),255-_TIF_PER_TRAP # clear TIF_PER_TRAP - la %r2,SP_PTREGS(%r15) # load pt_regs - brasl %r14,do_signal # call do_signal + lgr %r2,%r11 # pass pointer to pt_regs + brasl %r14,do_signal tm __TI_flags+7(%r12),_TIF_SYSCALL jno sysc_return - lmg %r2,%r6,SP_R2(%r15) # load svc arguments - lghi %r7,0 # svc 0 returns -ENOSYS - lh %r1,SP_SVC_CODE+2(%r15) # load new svc number + lmg %r2,%r7,__PT_R2(%r11) # load svc arguments + lghi %r8,0 # svc 0 returns -ENOSYS + lh %r1,__PT_SVC_CODE+2(%r11) # load new svc number cghi %r1,NR_syscalls jnl sysc_nr_ok # invalid svc number -> do svc 0 - slag %r7,%r1,2 + slag %r8,%r1,2 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 + lgr %r2,%r11 # pass pointer to pt_regs larl %r14,sysc_return - jg do_notify_resume # call do_notify_resume + jg do_notify_resume # # _TIF_PER_TRAP is set, call do_per_trap # sysc_singlestep: ni __TI_flags+7(%r12),255-(_TIF_SYSCALL | _TIF_PER_TRAP) - la %r2,SP_PTREGS(%r15) # address of register-save area - larl %r14,sysc_return # load adr. of system return + lgr %r2,%r11 # pass pointer to pt_regs + larl %r14,sysc_return jg do_per_trap # @@ -365,41 +316,41 @@ sysc_singlestep: # and after the system call # sysc_tracesys: - la %r2,SP_PTREGS(%r15) # load pt_regs + lgr %r2,%r11 # pass pointer to pt_regs la %r3,0 - llgh %r0,SP_SVC_CODE+2(%r15) - stg %r0,SP_R2(%r15) + llgh %r0,__PT_SVC_CODE+2(%r11) + stg %r0,__PT_R2(%r11) brasl %r14,do_syscall_trace_enter lghi %r0,NR_syscalls clgr %r0,%r2 jnh sysc_tracenogo - sllg %r7,%r2,2 # svc number *4 - lgf %r8,0(%r7,%r10) + sllg %r8,%r2,2 + lgf %r9,0(%r8,%r10) sysc_tracego: - lmg %r3,%r6,SP_R3(%r15) - mvc SP_ARGS(8,%r15),SP_R7(%r15) - lg %r2,SP_ORIG_R2(%r15) - basr %r14,%r8 # call sys_xxx - stg %r2,SP_R2(%r15) # store return value + lmg %r3,%r7,__PT_R3(%r11) + stg %r7,STACK_FRAME_OVERHEAD(%r15) + lg %r2,__PT_ORIG_GPR2(%r11) + basr %r14,%r9 # call sys_xxx + stg %r2,__PT_R2(%r11) # store return value sysc_tracenogo: tm __TI_flags+6(%r12),_TIF_TRACE >> 8 jz sysc_return - la %r2,SP_PTREGS(%r15) # load pt_regs - larl %r14,sysc_return # return point is sysc_return + lgr %r2,%r11 # pass pointer to pt_regs + larl %r14,sysc_return jg do_syscall_trace_exit # # a new process exits the kernel with ret_from_fork # ENTRY(ret_from_fork) - lg %r13,__LC_SVC_NEW_PSW+8 - lg %r12,__LC_THREAD_INFO # load pointer to thread_info struct - tm SP_PSW+1(%r15),0x01 # forking a kernel thread ? + la %r11,STACK_FRAME_OVERHEAD(%r15) + lg %r12,__LC_THREAD_INFO + tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ? jo 0f - stg %r15,SP_R15(%r15) # store stack pointer for new kthread + stg %r15,__PT_R15(%r11) # store stack pointer for new kthread 0: brasl %r14,schedule_tail TRACE_IRQS_ON - stosm 24(%r15),0x03 # reenable interrupts + ssm __LC_SVC_NEW_PSW # reenable interrupts j sysc_tracenogo # @@ -409,26 +360,26 @@ ENTRY(ret_from_fork) ENTRY(kernel_execve) stmg %r12,%r15,96(%r15) lgr %r14,%r15 - aghi %r15,-SP_SIZE + aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) stg %r14,__SF_BACKCHAIN(%r15) - la %r12,SP_PTREGS(%r15) + la %r12,STACK_FRAME_OVERHEAD(%r15) xc 0(__PT_SIZE,%r12),0(%r12) lgr %r5,%r12 brasl %r14,do_execve ltgfr %r2,%r2 je 0f - aghi %r15,SP_SIZE + aghi %r15,(STACK_FRAME_OVERHEAD + __PT_SIZE) lmg %r12,%r15,96(%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 lg %r15,__LC_KERNEL_STACK # load ksp - aghi %r15,-SP_SIZE # make room for registers & psw - lg %r13,__LC_SVC_NEW_PSW+8 - mvc SP_PTREGS(__PT_SIZE,%r15),0(%r12) # copy pt_regs + aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) + la %r11,STACK_FRAME_OVERHEAD(%r15) + mvc 0(__PT_SIZE,%r11),0(%r12) # copy pt_regs lg %r12,__LC_THREAD_INFO xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) - stosm __SF_EMPTY(%r15),0x03 # reenable interrupts + ssm __LC_SVC_NEW_PSW # reenable interrupts brasl %r14,execve_tail j sysc_return @@ -437,127 +388,72 @@ ENTRY(kernel_execve) */ 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 - tm __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception - jnz 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(16,%r15),__LC_PGM_OLD_PSW - lg %r12,__LC_THREAD_INFO # load pointer to thread_info struct - HANDLE_SIE_INTERCEPT - tm SP_PSW+1(%r15),0x01 # interrupting from user ? - jz 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 - LAST_BREAK -pgm_no_vtime: - stg %r11,SP_ARGS(%r15) - lgf %r3,__LC_PGM_ILC # load program interruption code - lg %r4,__LC_TRANS_EXC_CODE - REENABLE_IRQS - lghi %r8,0x7f - ngr %r8,%r3 - sll %r8,3 - larl %r1,pgm_check_table - lg %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: - j sysc_return - -# -# handle per exception -# -pgm_per: - tm __LC_PGM_OLD_PSW,0x40 # test if per event recording is on - jnz 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(16),__LC_SVC_NEW_PSW - je pgm_svcper -# no interesting special case, ignore PER event - lpswe __LC_PGM_OLD_PSW - -# -# 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(16,%r15),__LC_PGM_OLD_PSW - lg %r12,__LC_THREAD_INFO # load pointer to thread_info struct - HANDLE_SIE_INTERCEPT - tm SP_PSW+1(%r15),0x01 # interrupting from user ? - jz 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 - LAST_BREAK -pgm_no_vtime2: + stmg %r8,%r15,__LC_SAVE_AREA_SYNC + lg %r10,__LC_LAST_BREAK + lg %r12,__LC_THREAD_INFO + larl %r13,system_call + lmg %r8,%r9,__LC_PGM_OLD_PSW + HANDLE_SIE_INTERCEPT %r14 + tmhh %r8,0x0001 # test problem state bit + jnz 1f # -> fault in user space + tmhh %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,__LC_SYNC_ENTER_TIMER + LAST_BREAK %r14 + lg %r15,__LC_KERNEL_STACK +2: aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) + la %r11,STACK_FRAME_OVERHEAD(%r15) + stmg %r0,%r7,__PT_R0(%r11) + mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC + stmg %r8,%r9,__PT_PSW(%r11) + stg %r10,__PT_ARGS(%r11) + tm __LC_PGM_ILC+3,0x80 # check for per exception + jz 0f lg %r1,__TI_task(%r12) - tm SP_PSW+1(%r15),0x01 # kernel per event ? - jz kernel_per - mvc __THREAD_per_cause(2,%r1),__LC_PER_CAUSE + tmhh %r8,0x0001 # kernel per event ? + jz pgm_kprobe + oi __TI_flags+7(%r12),_TIF_PER_TRAP mvc __THREAD_per_address(8,%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+7(%r12),_TIF_PER_TRAP # set TIF_PER_TRAP - lgf %r3,__LC_PGM_ILC # load program interruption code +0: lgf %r3,__LC_PGM_ILC # load program interruption code lg %r4,__LC_TRANS_EXC_CODE REENABLE_IRQS - lghi %r8,0x7f - ngr %r8,%r3 # clear per-event-bit and ilc - je pgm_exit2 - sll %r8,3 + xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) + lghi %r10,0x7f + ngr %r10,%r3 + je sysc_return + sll %r10,3 larl %r1,pgm_check_table - lg %r1,0(%r8,%r1) # load address of handler routine - la %r2,SP_PTREGS(%r15) # address of register-save area + lg %r1,0(%r10,%r1) # load address of handler routine + lgr %r2,%r11 # pass pointer to pt_regs basr %r14,%r1 # branch to interrupt-handler -pgm_exit2: 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 - lg %r12,__LC_THREAD_INFO # load pointer to thread_info struct - mvc SP_PSW(16,%r15),__LC_SVC_OLD_PSW - mvc SP_SVC_CODE(4,%r15),__LC_SVC_ILC - oi __TI_flags+7(%r12),(_TIF_SYSCALL | _TIF_PER_TRAP) - UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER - UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER - mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER - LAST_BREAK - lg %r8,__TI_task(%r12) - mvc __THREAD_per_cause(2,%r8),__LC_PER_CAUSE - mvc __THREAD_per_address(8,%r8),__LC_PER_ADDRESS - mvc __THREAD_per_paid(1,%r8),__LC_PER_PAID - stosm __SF_EMPTY(%r15),0x03 # reenable interrupts - lmg %r2,%r6,SP_R2(%r15) # load svc arguments - j sysc_do_svc +pgm_kprobe: + REENABLE_IRQS + xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) + lgr %r2,%r11 # pass pointer to pt_regs + brasl %r14,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 - brasl %r14,do_per_trap - j pgm_exit +pgm_svcper: + oi __TI_flags+7(%r12),_TIF_PER_TRAP + mvc __LC_RETURN_PSW(8),__LC_SVC_NEW_PSW + larl %r14,sysc_per + stg %r14,__LC_RETURN_PSW+8 + lpswe __LC_RETURN_PSW # branch to sysc_per and enable irqs /* * IO interrupt handler routine @@ -565,21 +461,25 @@ 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+40 - CREATE_STACK_FRAME __LC_SAVE_AREA+40 - mvc SP_PSW(16,%r15),0(%r12) # move user PSW to stack - lg %r12,__LC_THREAD_INFO # load pointer to thread_info struct - HANDLE_SIE_INTERCEPT - tm SP_PSW+1(%r15),0x01 # interrupting from user ? - jz 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 - LAST_BREAK -io_no_vtime: + stmg %r8,%r15,__LC_SAVE_AREA_ASYNC + lg %r10,__LC_LAST_BREAK + lg %r12,__LC_THREAD_INFO + larl %r13,system_call + lmg %r8,%r9,__LC_IO_OLD_PSW + HANDLE_SIE_INTERCEPT %r14 + SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT + tmhh %r8,0x0001 # interrupting from user? + jz io_skip + UPDATE_VTIME %r14,__LC_ASYNC_ENTER_TIMER + LAST_BREAK %r14 +io_skip: + stmg %r0,%r7,__PT_R0(%r11) + mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC + stmg %r8,%r9,__PT_PSW(%r11) TRACE_IRQS_OFF - la %r2,SP_PTREGS(%r15) # address of register-save area - brasl %r14,do_IRQ # call standard irq handler + xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) + lgr %r2,%r11 # pass pointer to pt_regs + brasl %r14,do_IRQ io_return: LOCKDEP_SYS_EXIT TRACE_IRQS_ON @@ -587,7 +487,14 @@ io_tif: tm __TI_flags+7(%r12),_TIF_WORK_INT jnz io_work # there is work to do (signals etc.) io_restore: - RESTORE_ALL __LC_RETURN_PSW,0 + lg %r14,__LC_VDSO_PER_CPU + lmg %r0,%r10,__PT_R0(%r11) + mvc __LC_RETURN_PSW(16),__PT_PSW(%r11) + ni __LC_RETURN_PSW+1,0xfd # clear wait state bit + stpt __LC_EXIT_TIMER + mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER + lmg %r11,%r15,__PT_R11(%r11) + lpswe __LC_RETURN_PSW io_done: # @@ -600,7 +507,7 @@ 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 ? + tm __PT_PSW+1(%r11),0x01 # returning to user ? jo io_work_user # yes -> do resched & signal #ifdef CONFIG_PREEMPT # check for preemptive scheduling @@ -609,10 +516,11 @@ io_work: tm __TI_flags+7(%r12),_TIF_NEED_RESCHED jno io_restore # switch to kernel stack - lg %r1,SP_R15(%r15) - aghi %r1,-SP_SIZE - mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) - xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) # clear back chain + lg %r1,__PT_R15(%r11) + aghi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE) + mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) + xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) + la %r11,STACK_FRAME_OVERHEAD(%r1) lgr %r15,%r1 # TRACE_IRQS_ON already done at io_return, call # TRACE_IRQS_OFF to keep things symmetrical @@ -628,9 +536,10 @@ io_work: # io_work_user: lg %r1,__LC_KERNEL_STACK - aghi %r1,-SP_SIZE - mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) - xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) # clear back chain + aghi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE) + mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) + xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) + la %r11,STACK_FRAME_OVERHEAD(%r1) lgr %r15,%r1 # @@ -663,9 +572,9 @@ io_mcck_pending: # io_reschedule: # TRACE_IRQS_ON already done at io_return - stosm __SF_EMPTY(%r15),0x03 # reenable interrupts + ssm __LC_SVC_NEW_PSW # reenable interrupts brasl %r14,schedule # 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 j io_return @@ -674,10 +583,10 @@ io_reschedule: # 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 - brasl %r14,do_signal # call do_signal - stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts + ssm __LC_SVC_NEW_PSW # reenable interrupts + lgr %r2,%r11 # pass pointer to pt_regs + brasl %r14,do_signal + ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts TRACE_IRQS_OFF j io_return @@ -686,10 +595,10 @@ io_sigpending: # 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 - brasl %r14,do_notify_resume # call do_notify_resume - stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts + ssm __LC_SVC_NEW_PSW # reenable interrupts + lgr %r2,%r11 # pass pointer to pt_regs + brasl %r14,do_notify_resume + ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts TRACE_IRQS_OFF j io_return @@ -699,21 +608,24 @@ 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+40 - CREATE_STACK_FRAME __LC_SAVE_AREA+40 - mvc SP_PSW(16,%r15),0(%r12) # move user PSW to stack - lg %r12,__LC_THREAD_INFO # load pointer to thread_info struct - HANDLE_SIE_INTERCEPT - tm SP_PSW+1(%r15),0x01 # interrupting from user ? - jz 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 - LAST_BREAK -ext_no_vtime: + stmg %r8,%r15,__LC_SAVE_AREA_ASYNC + lg %r10,__LC_LAST_BREAK + lg %r12,__LC_THREAD_INFO + larl %r13,system_call + lmg %r8,%r9,__LC_EXT_OLD_PSW + HANDLE_SIE_INTERCEPT %r14 + SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT + tmhh %r8,0x0001 # interrupting from user ? + jz ext_skip + UPDATE_VTIME %r14,__LC_ASYNC_ENTER_TIMER + LAST_BREAK %r14 +ext_skip: + stmg %r0,%r7,__PT_R0(%r11) + mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC + stmg %r8,%r9,__PT_PSW(%r11) TRACE_IRQS_OFF lghi %r1,4096 - la %r2,SP_PTREGS(%r15) # address of register-save area + lgr %r2,%r11 # pass pointer to pt_regs llgf %r3,__LC_CPU_ADDRESS # get cpu address + interruption code llgf %r4,__LC_EXT_PARAMS # get external parameter lg %r5,__LC_EXT_PARAMS2-4096(%r1) # get 64 bit external parameter @@ -730,81 +642,77 @@ ENTRY(mcck_int_handler) la %r1,4095 # revalidate r1 spt __LC_CPU_TIMER_SAVE_AREA-4095(%r1) # revalidate cpu timer lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs - stmg %r11,%r15,__LC_SAVE_AREA+80 + lg %r10,__LC_LAST_BREAK + lg %r12,__LC_THREAD_INFO larl %r13,system_call - lg %r11,__LC_LAST_BREAK - la %r12,__LC_MCK_OLD_PSW + lmg %r8,%r9,__LC_MCK_OLD_PSW + HANDLE_SIE_INTERCEPT %r14 tm __LC_MCCK_CODE,0x80 # system damage? - jo mcck_int_main # yes -> rest of mcck code invalid - la %r14,4095 - mvc __LC_MCCK_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA-4095(%r14) + jo mcck_panic # yes -> rest of mcck code invalid + lghi %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? - jo 1f + jo 3f la %r14,__LC_SYNC_ENTER_TIMER clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER jl 0f la %r14,__LC_ASYNC_ENTER_TIMER 0: clc 0(8,%r14),__LC_EXIT_TIMER - jl 0f + jl 1f la %r14,__LC_EXIT_TIMER -0: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER - jl 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? - jno mcck_int_main # no -> skip cleanup critical - tm __LC_MCK_OLD_PSW+1,0x01 # test problem state bit - jnz mcck_int_main # from user -> load kernel stack - clc __LC_MCK_OLD_PSW+8(8),BASED(.Lcritical_end) - jhe mcck_int_main - clc __LC_MCK_OLD_PSW+8(8),BASED(.Lcritical_start) - jl mcck_int_main - brasl %r14,cleanup_critical -mcck_int_main: - lg %r14,__LC_PANIC_STACK # are we already on the panic stack? - slgr %r14,%r15 - srag %r14,%r14,PAGE_SHIFT - jz 0f - lg %r15,__LC_PANIC_STACK # load panic stack -0: aghi %r15,-SP_SIZE # make room for registers & psw - CREATE_STACK_FRAME __LC_SAVE_AREA+80 - mvc SP_PSW(16,%r15),0(%r12) - lg %r12,__LC_THREAD_INFO # load pointer to thread_info struct - tm __LC_MCCK_CODE+2,0x08 # mwp of old psw valid? - jno mcck_no_vtime # no -> no timer update - HANDLE_SIE_INTERCEPT - tm SP_PSW+1(%r15),0x01 # interrupting from user ? - jz 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 - LAST_BREAK -mcck_no_vtime: - la %r2,SP_PTREGS(%r15) # load pt_regs +3: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid? + jno mcck_panic # no -> skip cleanup critical + SWITCH_ASYNC __LC_GPREGS_SAVE_AREA+64,__LC_PANIC_STACK,PAGE_SHIFT + tm %r8,0x0001 # interrupting from user ? + jz mcck_skip + UPDATE_VTIME %r14,__LC_MCCK_ENTER_TIMER + LAST_BREAK %r14 +mcck_skip: + lghi %r14,__LC_GPREGS_SAVE_AREA + mvc __PT_R0(128,%r11),0(%r14) + stmg %r8,%r9,__PT_PSW(%r11) + xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) + lgr %r2,%r11 # pass pointer to pt_regs brasl %r14,s390_do_machine_check - tm SP_PSW+1(%r15),0x01 # returning to user ? + tm __PT_PSW+1(%r11),0x01 # returning to user ? jno mcck_return lg %r1,__LC_KERNEL_STACK # switch to kernel stack - aghi %r1,-SP_SIZE - mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15) - xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) # clear back chain + aghi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE) + mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) + xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) + la %r11,STACK_FRAME_OVERHEAD(%r1) lgr %r15,%r1 - stosm __SF_EMPTY(%r15),0x04 # turn dat on + ssm __LC_PGM_NEW_PSW # turn dat on, keep irqs off tm __TI_flags+7(%r12),_TIF_MCCK_PENDING jno mcck_return TRACE_IRQS_OFF brasl %r14,s390_handle_mcck TRACE_IRQS_ON mcck_return: - mvc __LC_RETURN_MCCK_PSW(16),SP_PSW(%r15) # move return PSW + lg %r14,__LC_VDSO_PER_CPU + lmg %r0,%r10,__PT_R0(%r11) + mvc __LC_RETURN_MCCK_PSW(16),__PT_PSW(%r11) # move return PSW ni __LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit - lmg %r0,%r15,SP_R0(%r15) # load gprs 0-15 tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? jno 0f stpt __LC_EXIT_TIMER -0: lpswe __LC_RETURN_MCCK_PSW # back to caller -mcck_done: + mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER +0: lmg %r11,%r15,__PT_R11(%r11) + lpswe __LC_RETURN_MCCK_PSW + +mcck_panic: + lg %r14,__LC_PANIC_STACK + slgr %r14,%r15 + srag %r14,%r14,PAGE_SHIFT + jz 0f + lg %r15,__LC_PANIC_STACK +0: aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) + j mcck_skip /* * Restart interruption handler, kick starter for additional CPUs @@ -818,17 +726,18 @@ 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) - lg %r15,__LC_SAVE_AREA+120 # load ksp + lghi %r10,__LC_GPREGS_SAVE_AREA + lg %r15,120(%r10) # load ksp lghi %r10,__LC_CREGS_SAVE_AREA - lctlg %c0,%c15,0(%r10) # get new ctl regs + lctlg %c0,%c15,0(%r10) # get new ctl regs lghi %r10,__LC_AREGS_SAVE_AREA lam %a0,%a15,0(%r10) - lmg %r6,%r15,__SF_GPRS(%r15) # load registers from clone + lmg %r6,%r15,__SF_GPRS(%r15)# load registers from clone lg %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 brasl %r14,start_secondary .align 8 restart_vtime: @@ -852,16 +761,16 @@ restart_go: # PSW restart interrupt handler # ENTRY(psw_restart_int_handler) - stg %r15,__LC_SAVE_AREA+120(%r0) # save r15 + stg %r15,__LC_SAVE_AREA_RESTART larl %r15,restart_stack # load restart stack lg %r15,0(%r15) - aghi %r15,-SP_SIZE # make room for pt_regs - stmg %r0,%r14,SP_R0(%r15) # store gprs %r0-%r14 to stack - mvc SP_R15(8,%r15),__LC_SAVE_AREA+120(%r0)# store saved %r15 to stack - mvc SP_PSW(16,%r15),__LC_RST_OLD_PSW(%r0)# store restart old psw - xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) # set backchain to 0 + aghi %r15,-__PT_SIZE # create pt_regs on stack + stmg %r0,%r14,__PT_R0(%r15) + mvc __PT_R15(8,%r15),__LC_SAVE_AREA_RESTART + mvc __PT_PSW(16,%r15),__LC_RST_OLD_PSW # store restart old psw + aghi %r15,-STACK_FRAME_OVERHEAD + xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) brasl %r14,do_restart - larl %r14,restart_psw_crash # load disabled wait PSW if lpswe 0(%r14) # do_restart returns .align 8 @@ -877,172 +786,153 @@ restart_psw_crash: * Setup a pt_regs so that show_trace can provide a good call trace. */ stack_overflow: - lg %r15,__LC_PANIC_STACK # change to panic stack - aghi %r15,-SP_SIZE - mvc SP_PSW(16,%r15),0(%r12) # move user PSW to stack - stmg %r0,%r10,SP_R0(%r15) # store gprs %r0-%r10 to kernel stack - la %r1,__LC_SAVE_AREA - chi %r12,__LC_SVC_OLD_PSW - je 0f - chi %r12,__LC_PGM_OLD_PSW - je 0f - la %r1,__LC_SAVE_AREA+40 -0: mvc SP_R11(40,%r15),0(%r1) # move %r11-%r15 to stack - mvc SP_ARGS(8,%r15),__LC_LAST_BREAK - xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) # clear back chain - la %r2,SP_PTREGS(%r15) # load pt_regs + lg %r11,__LC_PANIC_STACK # change to panic stack + aghi %r11,-__PT_SIZE # create pt_regs + stmg %r0,%r7,__PT_R0(%r11) + stmg %r8,%r9,__PT_PSW(%r11) + mvc __PT_R8(64,%r11),0(%r14) + stg %r10,__PT_ORIG_GPR2(%r11) # store last break to orig_gpr2 + lgr %r15,%r11 + aghi %r15,-STACK_FRAME_OVERHEAD + xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) + lgr %r2,%r11 # pass pointer to pt_regs jg kernel_stack_overflow #endif -cleanup_table_system_call: - .quad system_call, sysc_do_svc -cleanup_table_sysc_tif: - .quad sysc_tif, sysc_restore -cleanup_table_sysc_restore: - .quad sysc_restore, sysc_done -cleanup_table_io_tif: - .quad io_tif, io_restore -cleanup_table_io_restore: - .quad io_restore, io_done + .align 8 +cleanup_table: + .quad system_call + .quad sysc_do_svc + .quad sysc_tif + .quad sysc_restore + .quad sysc_done + .quad io_tif + .quad io_restore + .quad io_done cleanup_critical: - clc 8(8,%r12),BASED(cleanup_table_system_call) + clg %r9,BASED(cleanup_table) # system_call jl 0f - clc 8(8,%r12),BASED(cleanup_table_system_call+8) + clg %r9,BASED(cleanup_table+8) # sysc_do_svc jl cleanup_system_call -0: - clc 8(8,%r12),BASED(cleanup_table_sysc_tif) + clg %r9,BASED(cleanup_table+16) # sysc_tif jl 0f - clc 8(8,%r12),BASED(cleanup_table_sysc_tif+8) + clg %r9,BASED(cleanup_table+24) # sysc_restore jl cleanup_sysc_tif -0: - clc 8(8,%r12),BASED(cleanup_table_sysc_restore) - jl 0f - clc 8(8,%r12),BASED(cleanup_table_sysc_restore+8) + clg %r9,BASED(cleanup_table+32) # sysc_done jl cleanup_sysc_restore -0: - clc 8(8,%r12),BASED(cleanup_table_io_tif) + clg %r9,BASED(cleanup_table+40) # io_tif jl 0f - clc 8(8,%r12),BASED(cleanup_table_io_tif+8) + clg %r9,BASED(cleanup_table+48) # io_restore jl cleanup_io_tif -0: - clc 8(8,%r12),BASED(cleanup_table_io_restore) - jl 0f - clc 8(8,%r12),BASED(cleanup_table_io_restore+8) + clg %r9,BASED(cleanup_table+56) # io_done jl cleanup_io_restore -0: - br %r14 +0: br %r14 + cleanup_system_call: - mvc __LC_RETURN_PSW(16),0(%r12) - clc __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+8) + # check if stpt has been executed + clg %r9,BASED(cleanup_system_call_insn) jh 0f - mvc __LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER - cghi %r12,__LC_MCK_OLD_PSW - je 0f mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER -0: cghi %r12,__LC_MCK_OLD_PSW - la %r12,__LC_SAVE_AREA+80 + cghi %r11,__LC_SAVE_AREA_ASYNC je 0f - la %r12,__LC_SAVE_AREA+40 -0: clc __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+16) - jhe cleanup_vtime - clc __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn) + mvc __LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER +0: # check if stmg has been executed + clg %r9,BASED(cleanup_system_call_insn+8) jh 0f - mvc __LC_SAVE_AREA(40),0(%r12) -0: lg %r15,__LC_KERNEL_STACK # problem state -> load ksp - aghi %r15,-SP_SIZE # make room for registers & psw - stg %r15,32(%r12) - stg %r11,0(%r12) - CREATE_STACK_FRAME __LC_SAVE_AREA - mvc 8(8,%r12),__LC_THREAD_INFO - lg %r12,__LC_THREAD_INFO - mvc SP_PSW(16,%r15),__LC_SVC_OLD_PSW - mvc SP_SVC_CODE(4,%r15),__LC_SVC_ILC - oi __TI_flags+7(%r12),_TIF_SYSCALL -cleanup_vtime: - clc __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+24) - jhe cleanup_stime - UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER -cleanup_stime: - clc __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+32) - jh cleanup_update - UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER -cleanup_update: + mvc __LC_SAVE_AREA_SYNC(64),0(%r11) +0: # check if base register setup + TIF bit load has been done + clg %r9,BASED(cleanup_system_call_insn+16) + jhe 0f + # set up saved registers r10 and r12 + stg %r10,16(%r11) # r10 last break + stg %r12,32(%r11) # r12 thread-info pointer +0: # check if the user time update has been done + clg %r9,BASED(cleanup_system_call_insn+24) + jh 0f + lg %r15,__LC_EXIT_TIMER + slg %r15,__LC_SYNC_ENTER_TIMER + alg %r15,__LC_USER_TIMER + stg %r15,__LC_USER_TIMER +0: # check if the system time update has been done + clg %r9,BASED(cleanup_system_call_insn+32) + jh 0f + lg %r15,__LC_LAST_UPDATE_TIMER + slg %r15,__LC_EXIT_TIMER + alg %r15,__LC_SYSTEM_TIMER + stg %r15,__LC_SYSTEM_TIMER +0: # update accounting time stamp mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER - srag %r12,%r11,23 - lg %r12,__LC_THREAD_INFO + # do LAST_BREAK + lg %r9,16(%r11) + srag %r9,%r9,23 jz 0f - stg %r11,__TI_last_break(%r12) -0: mvc __LC_RETURN_PSW+8(8),BASED(cleanup_table_system_call+8) - la %r12,__LC_RETURN_PSW + mvc __TI_last_break(8,%r12),16(%r11) +0: # set up saved register r11 + lg %r15,__LC_KERNEL_STACK + aghi %r15,-__PT_SIZE + stg %r15,24(%r11) # r11 pt_regs pointer + # fill pt_regs + mvc __PT_R8(64,%r15),__LC_SAVE_AREA_SYNC + stmg %r0,%r7,__PT_R0(%r15) + mvc __PT_PSW(16,%r15),__LC_SVC_OLD_PSW + mvc __PT_SVC_CODE(4,%r15),__LC_SVC_ILC + # setup saved register r15 + aghi %r15,-STACK_FRAME_OVERHEAD + stg %r15,56(%r11) # r15 stack pointer + # set new psw address and exit + larl %r9,sysc_do_svc br %r14 cleanup_system_call_insn: - .quad sysc_saveall .quad system_call - .quad sysc_vtime - .quad sysc_stime - .quad sysc_update + .quad sysc_stmg + .quad sysc_per + .quad sysc_vtime+18 + .quad sysc_vtime+42 cleanup_sysc_tif: - mvc __LC_RETURN_PSW(8),0(%r12) - mvc __LC_RETURN_PSW+8(8),BASED(cleanup_table_sysc_tif) - la %r12,__LC_RETURN_PSW + larl %r9,sysc_tif br %r14 cleanup_sysc_restore: - clc 8(8,%r12),BASED(cleanup_sysc_restore_insn) - je 2f - clc 8(8,%r12),BASED(cleanup_sysc_restore_insn+8) - jhe 0f - mvc __LC_EXIT_TIMER(8),__LC_MCCK_ENTER_TIMER - cghi %r12,__LC_MCK_OLD_PSW + clg %r9,BASED(cleanup_sysc_restore_insn) je 0f - mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER -0: mvc __LC_RETURN_PSW(16),SP_PSW(%r15) - cghi %r12,__LC_MCK_OLD_PSW - la %r12,__LC_SAVE_AREA+80 - je 1f - la %r12,__LC_SAVE_AREA+40 -1: mvc 0(40,%r12),SP_R11(%r15) - lmg %r0,%r10,SP_R0(%r15) - lg %r15,SP_R15(%r15) -2: la %r12,__LC_RETURN_PSW + lg %r9,24(%r11) # get saved pointer to pt_regs + mvc __LC_RETURN_PSW(16),__PT_PSW(%r9) + mvc 0(64,%r11),__PT_R8(%r9) + lmg %r0,%r7,__PT_R0(%r9) +0: lmg %r8,%r9,__LC_RETURN_PSW br %r14 cleanup_sysc_restore_insn: .quad sysc_done - 4 - .quad sysc_done - 16 cleanup_io_tif: - mvc __LC_RETURN_PSW(8),0(%r12) - mvc __LC_RETURN_PSW+8(8),BASED(cleanup_table_io_tif) - la %r12,__LC_RETURN_PSW + larl %r9,io_tif br %r14 cleanup_io_restore: - clc 8(8,%r12),BASED(cleanup_io_restore_insn) - je 1f - clc 8(8,%r12),BASED(cleanup_io_restore_insn+8) - jhe 0f - mvc __LC_EXIT_TIMER(8),__LC_MCCK_ENTER_TIMER -0: mvc __LC_RETURN_PSW(16),SP_PSW(%r15) - mvc __LC_SAVE_AREA+80(40),SP_R11(%r15) - lmg %r0,%r10,SP_R0(%r15) - lg %r15,SP_R15(%r15) -1: la %r12,__LC_RETURN_PSW + clg %r9,BASED(cleanup_io_restore_insn) + je 0f + lg %r9,24(%r11) # get saved r11 pointer to pt_regs + mvc __LC_RETURN_PSW(16),__PT_PSW(%r9) + ni __LC_RETURN_PSW+1,0xfd # clear wait state bit + mvc 0(64,%r11),__PT_R8(%r9) + lmg %r0,%r7,__PT_R0(%r9) +0: lmg %r8,%r9,__LC_RETURN_PSW br %r14 cleanup_io_restore_insn: .quad io_done - 4 - .quad io_done - 16 /* * Integer constants */ - .align 4 + .align 8 .Lcritical_start: - .quad __critical_start -.Lcritical_end: - .quad __critical_end + .quad __critical_start +.Lcritical_length: + .quad __critical_end - __critical_start + #if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE) /* @@ -1094,8 +984,8 @@ sie_fault: .align 8 .Lsie_loop: .quad sie_loop -.Lsie_done: - .quad sie_done +.Lsie_length: + .quad sie_done - sie_loop .Lhost_id: .quad 0 |