| /* |
| * arch/s390/kernel/entry64.S |
| * S390 low-level entry points. |
| * |
| * Copyright (C) IBM Corp. 1999,2010 |
| * 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), |
| * Heiko Carstens <heiko.carstens@de.ibm.com> |
| */ |
| |
| #include <linux/init.h> |
| #include <linux/linkage.h> |
| #include <asm/cache.h> |
| #include <asm/errno.h> |
| #include <asm/ptrace.h> |
| #include <asm/thread_info.h> |
| #include <asm/asm-offsets.h> |
| #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 |
| |
| STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER |
| STACK_SIZE = 1 << STACK_SHIFT |
| |
| _TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ |
| _TIF_MCCK_PENDING | _TIF_PER_TRAP ) |
| _TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ |
| _TIF_MCCK_PENDING) |
| _TIF_TRACE = (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \ |
| _TIF_SYSCALL_TRACEPOINT) |
| _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 __LC_CMF_HPP # 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 |
| basr %r2,%r0 |
| brasl %r14,trace_hardirqs_on_caller |
| .endm |
| |
| .macro TRACE_IRQS_OFF |
| basr %r2,%r0 |
| brasl %r14,trace_hardirqs_off_caller |
| .endm |
| #else |
| #define TRACE_IRQS_ON |
| #define TRACE_IRQS_OFF |
| #endif |
| |
| #ifdef CONFIG_LOCKDEP |
| .macro LOCKDEP_SYS_EXIT |
| tm SP_PSW+1(%r15),0x01 # returning to user ? |
| jz 0f |
| 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 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 |
| .endm |
| |
| .macro SAVE_ALL_PGM psworg,savearea |
| stmg %r11,%r15,\savearea |
| tm \psworg+1,0x01 # test problem state bit |
| #ifdef CONFIG_CHECK_STACK |
| jnz 1f |
| tml %r15,STACK_SIZE - CONFIG_STACK_GUARD |
| jnz 2f |
| la %r12,\psworg |
| j stack_overflow |
| #else |
| jz 2f |
| #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) |
| jhe 0f |
| clc \psworg+8(8),BASED(.Lcritical_start) |
| jl 0f |
| brasl %r14,cleanup_critical |
| tm 1(%r12),0x01 # retest problem state after cleanup |
| jnz 1f |
| 0: lg %r14,__LC_ASYNC_STACK # are we already on the async. stack ? |
| slgr %r14,%r15 |
| srag %r14,%r14,STACK_SHIFT |
| #ifdef CONFIG_CHECK_STACK |
| 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 |
| .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 |
| .endm |
| |
| .macro LAST_BREAK |
| srag %r10,%r11,23 |
| jz 0f |
| stg %r11,__TI_last_break(%r12) |
| 0: |
| .endm |
| |
| .macro REENABLE_IRQS |
| mvc __SF_EMPTY(1,%r15),SP_PSW(%r15) |
| ni __SF_EMPTY(%r15),0xbf |
| ssm __SF_EMPTY(%r15) |
| .endm |
| |
| .section .kprobes.text, "ax" |
| |
| /* |
| * Scheduler resume function, called by switch_to |
| * gpr2 = (task_struct *) prev |
| * gpr3 = (task_struct *) next |
| * Returns: |
| * gpr2 = prev |
| */ |
| ENTRY(__switch_to) |
| lg %r4,__THREAD_info(%r2) # get thread_info of prev |
| lg %r5,__THREAD_info(%r3) # get thread_info of next |
| tm __TI_flags+7(%r4),_TIF_MCCK_PENDING # machine check pending? |
| jz 0f |
| ni __TI_flags+7(%r4),255-_TIF_MCCK_PENDING # clear flag in prev |
| oi __TI_flags+7(%r5),_TIF_MCCK_PENDING # set it in next |
| 0: stmg %r6,%r15,__SF_GPRS(%r15) # store gprs of prev task |
| stg %r15,__THREAD_ksp(%r2) # store kernel stack of prev |
| lg %r15,__THREAD_ksp(%r3) # load kernel stack of next |
| lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4 |
| lmg %r6,%r15,__SF_GPRS(%r15) # load gprs of next task |
| stg %r3,__LC_CURRENT # store task struct of next |
| mvc __LC_CURRENT_PID+4(4,%r0),__TASK_pid(%r3) # store pid of next |
| stg %r5,__LC_THREAD_INFO # store thread info of next |
| aghi %r5,STACK_SIZE # end of kernel stack of next |
| stg %r5,__LC_KERNEL_STACK # store end of kernel stack |
| br %r14 |
| |
| __critical_start: |
| /* |
| * SVC interrupt handler routine. System calls are synchronous events and |
| * are executed with interrupts enabled. |
| */ |
| |
| 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_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 |
| sysc_do_svc: |
| llgh %r7,SP_SVC_CODE+2(%r15) |
| slag %r7,%r7,2 # 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 |
| 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 |
| sysc_nr_ok: |
| larl %r10,sys_call_table |
| #ifdef CONFIG_COMPAT |
| tm __TI_flags+5(%r12),(_TIF_31BIT>>16) # running in 31 bit mode ? |
| jno sysc_noemu |
| larl %r10,sys_call_table_emu # use 31 bit emulation system calls |
| sysc_noemu: |
| #endif |
| 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) |
| |
| sysc_return: |
| LOCKDEP_SYS_EXIT |
| sysc_tif: |
| tm SP_PSW+1(%r15),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.) |
| ni __TI_flags+7(%r12),255-_TIF_SYSCALL |
| sysc_restore: |
| RESTORE_ALL __LC_RETURN_PSW,1 |
| sysc_done: |
| |
| # |
| # One of the work bits is on. Find out which one. |
| # |
| sysc_work: |
| tm __TI_flags+7(%r12),_TIF_MCCK_PENDING |
| jo sysc_mcck_pending |
| tm __TI_flags+7(%r12),_TIF_NEED_RESCHED |
| jo sysc_reschedule |
| tm __TI_flags+7(%r12),_TIF_SIGPENDING |
| jo sysc_sigpending |
| tm __TI_flags+7(%r12),_TIF_NOTIFY_RESUME |
| jo sysc_notify_resume |
| tm __TI_flags+7(%r12),_TIF_PER_TRAP |
| jo sysc_singlestep |
| j sysc_return # beware of critical section cleanup |
| |
| # |
| # _TIF_NEED_RESCHED is set, call schedule |
| # |
| sysc_reschedule: |
| larl %r14,sysc_return |
| jg schedule # return point is sysc_return |
| |
| # |
| # _TIF_MCCK_PENDING is set, call handler |
| # |
| sysc_mcck_pending: |
| larl %r14,sysc_return |
| jg s390_handle_mcck # TIF bit will be cleared by handler |
| |
| # |
| # _TIF_SIGPENDING is set, call do_signal |
| # |
| 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 |
| 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 |
| cghi %r1,NR_syscalls |
| jnl sysc_nr_ok # invalid svc number -> do svc 0 |
| slag %r7,%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 |
| larl %r14,sysc_return |
| jg do_notify_resume # call 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 |
| jg do_per_trap |
| |
| # |
| # call tracehook_report_syscall_entry/tracehook_report_syscall_exit before |
| # and after the system call |
| # |
| sysc_tracesys: |
| la %r2,SP_PTREGS(%r15) # load pt_regs |
| la %r3,0 |
| llgh %r0,SP_SVC_CODE+2(%r15) |
| stg %r0,SP_R2(%r15) |
| 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) |
| 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 |
| 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 |
| 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 ? |
| jo 0f |
| stg %r15,SP_R15(%r15) # store stack pointer for new kthread |
| 0: brasl %r14,schedule_tail |
| TRACE_IRQS_ON |
| stosm 24(%r15),0x03 # reenable interrupts |
| j sysc_tracenogo |
| |
| # |
| # kernel_execve function needs to deal with pt_regs that is not |
| # at the usual place |
| # |
| ENTRY(kernel_execve) |
| stmg %r12,%r15,96(%r15) |
| lgr %r14,%r15 |
| aghi %r15,-SP_SIZE |
| stg %r14,__SF_BACKCHAIN(%r15) |
| la %r12,SP_PTREGS(%r15) |
| xc 0(__PT_SIZE,%r12),0(%r12) |
| lgr %r5,%r12 |
| brasl %r14,do_execve |
| ltgfr %r2,%r2 |
| je 0f |
| aghi %r15,SP_SIZE |
| lmg %r12,%r15,96(%r15) |
| br %r14 |
| # execve succeeded. |
| 0: stnsm __SF_EMPTY(%r15),0xfc # disable 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 |
| lg %r12,__LC_THREAD_INFO |
| xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
| stosm __SF_EMPTY(%r15),0x03 # reenable interrupts |
| brasl %r14,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 |
| 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: |
| 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 |
| mvc __THREAD_per_address(8,%r1),__LC_PER_ADDRESS |
| 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 |
| 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 |
| 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_exit2: |
| j sysc_return |
| |
| # |
| # it was a single stepped SVC that is causing all the trouble |
| # |
| 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 |
| |
| # |
| # per was called from kernel, must be kprobes |
| # |
| kernel_per: |
| REENABLE_IRQS |
| la %r2,SP_PTREGS(%r15) # address of register-save area |
| brasl %r14,do_per_trap |
| j pgm_exit |
| |
| /* |
| * IO interrupt handler routine |
| */ |
| 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: |
| TRACE_IRQS_OFF |
| la %r2,SP_PTREGS(%r15) # address of register-save area |
| brasl %r14,do_IRQ # call standard irq handler |
| io_return: |
| LOCKDEP_SYS_EXIT |
| TRACE_IRQS_ON |
| 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 |
| io_done: |
| |
| # |
| # There is work todo, find out in which context we have been interrupted: |
| # 1) if we return to user space we can do all _TIF_WORK_INT work |
| # 2) if we return to kernel code and kvm is enabled check if we need to |
| # modify the psw to leave SIE |
| # 3) if we return to kernel code and preemptive scheduling is enabled check |
| # the preemption counter and if it is zero call preempt_schedule_irq |
| # 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 ? |
| jo io_work_user # yes -> do resched & signal |
| #ifdef CONFIG_PREEMPT |
| # check for preemptive scheduling |
| icm %r0,15,__TI_precount(%r12) |
| jnz io_restore # preemption is disabled |
| 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 |
| lgr %r15,%r1 |
| # TRACE_IRQS_ON already done at io_return, call |
| # TRACE_IRQS_OFF to keep things symmetrical |
| TRACE_IRQS_OFF |
| brasl %r14,preempt_schedule_irq |
| j io_return |
| #else |
| j io_restore |
| #endif |
| |
| # |
| # Need to do work before returning to userspace, switch to kernel stack |
| # |
| 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 |
| lgr %r15,%r1 |
| |
| # |
| # One of the work bits is on. Find out which one. |
| # Checked are: _TIF_SIGPENDING, _TIF_NOTIFY_RESUME, _TIF_NEED_RESCHED |
| # and _TIF_MCCK_PENDING |
| # |
| io_work_tif: |
| tm __TI_flags+7(%r12),_TIF_MCCK_PENDING |
| jo io_mcck_pending |
| tm __TI_flags+7(%r12),_TIF_NEED_RESCHED |
| jo io_reschedule |
| tm __TI_flags+7(%r12),_TIF_SIGPENDING |
| jo io_sigpending |
| tm __TI_flags+7(%r12),_TIF_NOTIFY_RESUME |
| 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 |
| brasl %r14,s390_handle_mcck # TIF bit will be cleared by handler |
| TRACE_IRQS_OFF |
| j io_return |
| |
| # |
| # _TIF_NEED_RESCHED is set, call schedule |
| # |
| io_reschedule: |
| # TRACE_IRQS_ON already done at io_return |
| stosm __SF_EMPTY(%r15),0x03 # reenable interrupts |
| brasl %r14,schedule # call scheduler |
| stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts |
| TRACE_IRQS_OFF |
| j io_return |
| |
| # |
| # _TIF_SIGPENDING or 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 |
| brasl %r14,do_signal # call do_signal |
| stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts |
| TRACE_IRQS_OFF |
| j io_return |
| |
| # |
| # _TIF_NOTIFY_RESUME or is set, call do_notify_resume |
| # |
| 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 |
| TRACE_IRQS_OFF |
| j io_return |
| |
| /* |
| * External interrupt handler routine |
| */ |
| 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: |
| TRACE_IRQS_OFF |
| lghi %r1,4096 |
| la %r2,SP_PTREGS(%r15) # address of register-save area |
| 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 |
| brasl %r14,do_extint |
| j io_return |
| |
| __critical_end: |
| |
| /* |
| * Machine check handler routines |
| */ |
| ENTRY(mcck_int_handler) |
| stck __LC_MCCK_CLOCK |
| 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 |
| larl %r13,system_call |
| lg %r11,__LC_LAST_BREAK |
| la %r12,__LC_MCK_OLD_PSW |
| 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) |
| tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid? |
| jo 1f |
| 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 |
| la %r14,__LC_EXIT_TIMER |
| 0: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER |
| jl 0f |
| la %r14,__LC_LAST_UPDATE_TIMER |
| 0: 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 |
| brasl %r14,s390_do_machine_check |
| tm SP_PSW+1(%r15),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 |
| lgr %r15,%r1 |
| stosm __SF_EMPTY(%r15),0x04 # turn dat on |
| 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 |
| 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: |
| |
| /* |
| * Restart interruption handler, kick starter for additional CPUs |
| */ |
| #ifdef CONFIG_SMP |
| __CPUINIT |
| ENTRY(restart_int_handler) |
| basr %r1,0 |
| restart_base: |
| spt restart_vtime-restart_base(%r1) |
| 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_CREGS_SAVE_AREA |
| 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 |
| 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 |
| brasl %r14,start_secondary |
| .align 8 |
| restart_vtime: |
| .long 0x7fffffff,0xffffffff |
| .previous |
| #else |
| /* |
| * If we do not run with SMP enabled, let the new CPU crash ... |
| */ |
| ENTRY(restart_int_handler) |
| basr %r1,0 |
| restart_base: |
| lpswe restart_crash-restart_base(%r1) |
| .align 8 |
| restart_crash: |
| .long 0x000a0000,0x00000000,0x00000000,0x00000000 |
| restart_go: |
| #endif |
| |
| # |
| # PSW restart interrupt handler |
| # |
| ENTRY(psw_restart_int_handler) |
| stg %r15,__LC_SAVE_AREA+120(%r0) # save r15 |
| 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 |
| brasl %r14,do_restart |
| |
| larl %r14,restart_psw_crash # load disabled wait PSW if |
| lpswe 0(%r14) # do_restart returns |
| .align 8 |
| restart_psw_crash: |
| .quad 0x0002000080000000,0x0000000000000000 + restart_psw_crash |
| |
| .section .kprobes.text, "ax" |
| |
| #ifdef CONFIG_CHECK_STACK |
| /* |
| * The synchronous or the asynchronous stack overflowed. We are dead. |
| * No need to properly save the registers, we are going to panic anyway. |
| * 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 |
| 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 |
| |
| cleanup_critical: |
| clc 8(8,%r12),BASED(cleanup_table_system_call) |
| jl 0f |
| clc 8(8,%r12),BASED(cleanup_table_system_call+8) |
| jl cleanup_system_call |
| 0: |
| clc 8(8,%r12),BASED(cleanup_table_sysc_tif) |
| jl 0f |
| clc 8(8,%r12),BASED(cleanup_table_sysc_tif+8) |
| 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) |
| jl cleanup_sysc_restore |
| 0: |
| clc 8(8,%r12),BASED(cleanup_table_io_tif) |
| jl 0f |
| clc 8(8,%r12),BASED(cleanup_table_io_tif+8) |
| 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) |
| jl cleanup_io_restore |
| 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) |
| 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 |
| 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) |
| 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_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER |
| srag %r12,%r11,23 |
| lg %r12,__LC_THREAD_INFO |
| 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 |
| br %r14 |
| cleanup_system_call_insn: |
| .quad sysc_saveall |
| .quad system_call |
| .quad sysc_vtime |
| .quad sysc_stime |
| .quad sysc_update |
| |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| br %r14 |
| cleanup_io_restore_insn: |
| .quad io_done - 4 |
| .quad io_done - 16 |
| |
| /* |
| * Integer constants |
| */ |
| .align 4 |
| .Lcritical_start: |
| .quad __critical_start |
| .Lcritical_end: |
| .quad __critical_end |
| |
| #if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE) |
| /* |
| * sie64a calling convention: |
| * %r2 pointer to sie control block |
| * %r3 guest register save area |
| */ |
| ENTRY(sie64a) |
| stmg %r6,%r14,__SF_GPRS(%r15) # save kernel registers |
| stg %r2,__SF_EMPTY(%r15) # save control block pointer |
| stg %r3,__SF_EMPTY+8(%r15) # save guest register save area |
| lmg %r0,%r13,0(%r3) # load guest gprs 0-13 |
| lg %r14,__LC_THREAD_INFO # pointer thread_info struct |
| oi __TI_flags+6(%r14),_TIF_SIE>>8 |
| sie_loop: |
| lg %r14,__LC_THREAD_INFO # pointer thread_info struct |
| tm __TI_flags+7(%r14),_TIF_EXIT_SIE |
| jnz sie_exit |
| lg %r14,__LC_GMAP # get gmap pointer |
| ltgr %r14,%r14 |
| jz sie_gmap |
| lctlg %c1,%c1,__GMAP_ASCE(%r14) # load primary asce |
| sie_gmap: |
| lg %r14,__SF_EMPTY(%r15) # get control block pointer |
| SPP __SF_EMPTY(%r15) # set guest id |
| sie 0(%r14) |
| sie_done: |
| SPP __LC_CMF_HPP # set host id |
| lg %r14,__LC_THREAD_INFO # pointer thread_info struct |
| sie_exit: |
| lctlg %c1,%c1,__LC_USER_ASCE # load primary asce |
| ni __TI_flags+6(%r14),255-(_TIF_SIE>>8) |
| lg %r14,__SF_EMPTY+8(%r15) # load guest register save area |
| stmg %r0,%r13,0(%r14) # save guest gprs 0-13 |
| lmg %r6,%r14,__SF_GPRS(%r15) # restore kernel registers |
| lghi %r2,0 |
| br %r14 |
| sie_fault: |
| lctlg %c1,%c1,__LC_USER_ASCE # load primary asce |
| lg %r14,__LC_THREAD_INFO # pointer thread_info struct |
| ni __TI_flags+6(%r14),255-(_TIF_SIE>>8) |
| lg %r14,__SF_EMPTY+8(%r15) # load guest register save area |
| stmg %r0,%r13,0(%r14) # save guest gprs 0-13 |
| lmg %r6,%r14,__SF_GPRS(%r15) # restore kernel registers |
| lghi %r2,-EFAULT |
| br %r14 |
| |
| .align 8 |
| .Lsie_loop: |
| .quad sie_loop |
| .Lsie_done: |
| .quad sie_done |
| |
| .section __ex_table,"a" |
| .quad sie_loop,sie_fault |
| .previous |
| #endif |
| |
| .section .rodata, "a" |
| #define SYSCALL(esa,esame,emu) .long esame |
| .globl sys_call_table |
| sys_call_table: |
| #include "syscalls.S" |
| #undef SYSCALL |
| |
| #ifdef CONFIG_COMPAT |
| |
| #define SYSCALL(esa,esame,emu) .long emu |
| sys_call_table_emu: |
| #include "syscalls.S" |
| #undef SYSCALL |
| #endif |
