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Diffstat (limited to 'arch/s390/kernel/entry64.S')
| -rw-r--r-- | arch/s390/kernel/entry64.S | 881 |
1 files changed, 881 insertions, 0 deletions
diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S new file mode 100644 index 000000000000..51527ab8c8f9 --- /dev/null +++ b/arch/s390/kernel/entry64.S @@ -0,0 +1,881 @@ +/* + * arch/s390/kernel/entry.S + * S390 low-level entry points. + * + * S390 version + * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation + * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), + * Hartmut Penner (hp@de.ibm.com), + * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com), + */ + +#include <linux/sys.h> +#include <linux/linkage.h> +#include <linux/config.h> +#include <asm/cache.h> +#include <asm/lowcore.h> +#include <asm/errno.h> +#include <asm/ptrace.h> +#include <asm/thread_info.h> +#include <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_ILC = STACK_FRAME_OVERHEAD + __PT_ILC +SP_TRAP = STACK_FRAME_OVERHEAD + __PT_TRAP +SP_SIZE = STACK_FRAME_OVERHEAD + __PT_SIZE + +STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER +STACK_SIZE = 1 << STACK_SHIFT + +_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \ + _TIF_RESTART_SVC | _TIF_SINGLE_STEP ) +_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NEED_RESCHED) + +#define BASED(name) name-system_call(%r13) + + .macro STORE_TIMER lc_offset +#ifdef CONFIG_VIRT_CPU_ACCOUNTING + stpt \lc_offset +#endif + .endm + +#ifdef CONFIG_VIRT_CPU_ACCOUNTING + .macro UPDATE_VTIME lc_from,lc_to,lc_sum + lg %r10,\lc_from + slg %r10,\lc_to + alg %r10,\lc_sum + stg %r10,\lc_sum + .endm +#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 SAVE_ALL_BASE savearea + stmg %r12,%r15,\savearea + larl %r13,system_call + .endm + + .macro SAVE_ALL psworg,savearea,sync + la %r12,\psworg + .if \sync + tm \psworg+1,0x01 # test problem state bit + jz 2f # skip stack setup save + lg %r15,__LC_KERNEL_STACK # problem state -> load ksp + .else + 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 0(%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 + jz 2f +1: lg %r15,__LC_ASYNC_STACK # load async stack + .endif +#ifdef CONFIG_CHECK_STACK + j 3f +2: tml %r15,STACK_SIZE - CONFIG_STACK_GUARD + jz stack_overflow +3: +#endif +2: aghi %r15,-SP_SIZE # make room for registers & psw + mvc SP_PSW(16,%r15),0(%r12) # move user PSW to stack + la %r12,\psworg + stg %r2,SP_ORIG_R2(%r15) # store original content of gpr 2 + icm %r12,12,__LC_SVC_ILC + stmg %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack + st %r12,SP_ILC(%r15) + mvc SP_R12(32,%r15),\savearea # move %r12-%r15 to stack + la %r12,0 + stg %r12,__SF_BACKCHAIN(%r15) + .endm + + .macro RESTORE_ALL sync + mvc __LC_RETURN_PSW(16),SP_PSW(%r15) # move user PSW to lowcore + .if !\sync + ni __LC_RETURN_PSW+1,0xfd # clear wait state bit + .endif + lmg %r0,%r15,SP_R0(%r15) # load gprs 0-15 of user + STORE_TIMER __LC_EXIT_TIMER + lpswe __LC_RETURN_PSW # back to caller + .endm + +/* + * Scheduler resume function, called by switch_to + * gpr2 = (task_struct *) prev + * gpr3 = (task_struct *) next + * Returns: + * gpr2 = prev + */ + .globl __switch_to +__switch_to: + tm __THREAD_per+4(%r3),0xe8 # is the new process using per ? + jz __switch_to_noper # if not we're fine + stctg %c9,%c11,__SF_EMPTY(%r15)# We are using per stuff + clc __THREAD_per(24,%r3),__SF_EMPTY(%r15) + je __switch_to_noper # we got away without bashing TLB's + lctlg %c9,%c11,__THREAD_per(%r3) # Nope we didn't +__switch_to_noper: + stmg %r6,%r15,__SF_GPRS(%r15)# store __switch_to registers of prev task + stg %r15,__THREAD_ksp(%r2) # store kernel stack to prev->tss.ksp + lg %r15,__THREAD_ksp(%r3) # load kernel stack from next->tss.ksp + lmg %r6,%r15,__SF_GPRS(%r15)# load __switch_to registers of next task + stg %r3,__LC_CURRENT # __LC_CURRENT = current task struct + lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4 + lg %r3,__THREAD_info(%r3) # load thread_info from task struct + stg %r3,__LC_THREAD_INFO + aghi %r3,STACK_SIZE + stg %r3,__LC_KERNEL_STACK # __LC_KERNEL_STACK = new kernel stack + br %r14 + +__critical_start: +/* + * SVC interrupt handler routine. System calls are synchronous events and + * are executed with interrupts enabled. + */ + + .globl system_call +system_call: + STORE_TIMER __LC_SYNC_ENTER_TIMER +sysc_saveall: + SAVE_ALL_BASE __LC_SAVE_AREA + SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1 + llgh %r7,__LC_SVC_INT_CODE # get svc number from lowcore +#ifdef CONFIG_VIRT_CPU_ACCOUNTING +sysc_vtime: + tm SP_PSW+1(%r15),0x01 # interrupting from user ? + jz sysc_do_svc + 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 +#endif +sysc_do_svc: + lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct + slag %r7,%r7,2 # *4 and test for svc 0 + jnz sysc_nr_ok + # svc 0: system call number in %r1 + cl %r1,BASED(.Lnr_syscalls) + jnl sysc_nr_ok + lgfr %r7,%r1 # clear high word in r1 + slag %r7,%r7,2 # svc 0: system call number in %r1 +sysc_nr_ok: + mvc SP_ARGS(8,%r15),SP_R7(%r15) +sysc_do_restart: + larl %r10,sys_call_table +#ifdef CONFIG_S390_SUPPORT + tm SP_PSW+3(%r15),0x01 # are we running in 31 bit mode ? + jo sysc_noemu + larl %r10,sys_call_table_emu # use 31 bit emulation system calls +sysc_noemu: +#endif + tm __TI_flags+7(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT) + 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) + # ATTENTION: check sys_execve_glue before + # changing anything here !! + +sysc_return: + tm SP_PSW+1(%r15),0x01 # returning to user ? + jno sysc_leave + tm __TI_flags+7(%r9),_TIF_WORK_SVC + jnz sysc_work # there is work to do (signals etc.) +sysc_leave: + RESTORE_ALL 1 + +# +# recheck if there is more work to do +# +sysc_work_loop: + tm __TI_flags+7(%r9),_TIF_WORK_SVC + jz sysc_leave # there is no work to do +# +# One of the work bits is on. Find out which one. +# +sysc_work: + tm __TI_flags+7(%r9),_TIF_NEED_RESCHED + jo sysc_reschedule + tm __TI_flags+7(%r9),_TIF_SIGPENDING + jo sysc_sigpending + tm __TI_flags+7(%r9),_TIF_RESTART_SVC + jo sysc_restart + tm __TI_flags+7(%r9),_TIF_SINGLE_STEP + jo sysc_singlestep + j sysc_leave + +# +# _TIF_NEED_RESCHED is set, call schedule +# +sysc_reschedule: + larl %r14,sysc_work_loop + jg schedule # return point is sysc_return + +# +# _TIF_SIGPENDING is set, call do_signal +# +sysc_sigpending: + ni __TI_flags+7(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP + la %r2,SP_PTREGS(%r15) # load pt_regs + sgr %r3,%r3 # clear *oldset + brasl %r14,do_signal # call do_signal + tm __TI_flags+7(%r9),_TIF_RESTART_SVC + jo sysc_restart + tm __TI_flags+7(%r9),_TIF_SINGLE_STEP + jo sysc_singlestep + j sysc_leave # out of here, do NOT recheck + +# +# _TIF_RESTART_SVC is set, set up registers and restart svc +# +sysc_restart: + ni __TI_flags+7(%r9),255-_TIF_RESTART_SVC # clear TIF_RESTART_SVC + lg %r7,SP_R2(%r15) # load new svc number + slag %r7,%r7,2 # *4 + mvc SP_R2(8,%r15),SP_ORIG_R2(%r15) # restore first argument + lmg %r2,%r6,SP_R2(%r15) # load svc arguments + j sysc_do_restart # restart svc + +# +# _TIF_SINGLE_STEP is set, call do_single_step +# +sysc_singlestep: + ni __TI_flags+7(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP + lhi %r0,__LC_PGM_OLD_PSW + sth %r0,SP_TRAP(%r15) # set trap indication to pgm check + la %r2,SP_PTREGS(%r15) # address of register-save area + larl %r14,sysc_return # load adr. of system return + jg do_single_step # branch to do_sigtrap + + +__critical_end: + +# +# call syscall_trace before and after system call +# special linkage: %r12 contains the return address for trace_svc +# +sysc_tracesys: + la %r2,SP_PTREGS(%r15) # load pt_regs + la %r3,0 + srl %r7,2 + stg %r7,SP_R2(%r15) + brasl %r14,syscall_trace + lghi %r0,NR_syscalls + clg %r0,SP_R2(%r15) + jnh sysc_tracenogo + lg %r7,SP_R2(%r15) # strace might have changed the + sll %r7,2 # system call + lgf %r8,0(%r7,%r10) +sysc_tracego: + lmg %r3,%r6,SP_R3(%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+7(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT) + jz sysc_return + la %r2,SP_PTREGS(%r15) # load pt_regs + la %r3,1 + larl %r14,sysc_return # return point is sysc_return + jg syscall_trace + +# +# a new process exits the kernel with ret_from_fork +# + .globl ret_from_fork +ret_from_fork: + lg %r13,__LC_SVC_NEW_PSW+8 + lg %r9,__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 + stosm 24(%r15),0x03 # reenable interrupts + j sysc_return + +# +# clone, fork, vfork, exec and sigreturn need glue, +# because they all expect pt_regs as parameter, +# but are called with different parameter. +# return-address is set up above +# +sys_clone_glue: + la %r2,SP_PTREGS(%r15) # load pt_regs + jg sys_clone # branch to sys_clone + +#ifdef CONFIG_S390_SUPPORT +sys32_clone_glue: + la %r2,SP_PTREGS(%r15) # load pt_regs + jg sys32_clone # branch to sys32_clone +#endif + +sys_fork_glue: + la %r2,SP_PTREGS(%r15) # load pt_regs + jg sys_fork # branch to sys_fork + +sys_vfork_glue: + la %r2,SP_PTREGS(%r15) # load pt_regs + jg sys_vfork # branch to sys_vfork + +sys_execve_glue: + la %r2,SP_PTREGS(%r15) # load pt_regs + lgr %r12,%r14 # save return address + brasl %r14,sys_execve # call sys_execve + ltgr %r2,%r2 # check if execve failed + bnz 0(%r12) # it did fail -> store result in gpr2 + b 6(%r12) # SKIP STG 2,SP_R2(15) in + # system_call/sysc_tracesys +#ifdef CONFIG_S390_SUPPORT +sys32_execve_glue: + la %r2,SP_PTREGS(%r15) # load pt_regs + lgr %r12,%r14 # save return address + brasl %r14,sys32_execve # call sys32_execve + ltgr %r2,%r2 # check if execve failed + bnz 0(%r12) # it did fail -> store result in gpr2 + b 6(%r12) # SKIP STG 2,SP_R2(15) in + # system_call/sysc_tracesys +#endif + +sys_sigreturn_glue: + la %r2,SP_PTREGS(%r15) # load pt_regs as parameter + jg sys_sigreturn # branch to sys_sigreturn + +#ifdef CONFIG_S390_SUPPORT +sys32_sigreturn_glue: + la %r2,SP_PTREGS(%r15) # load pt_regs as parameter + jg sys32_sigreturn # branch to sys32_sigreturn +#endif + +sys_rt_sigreturn_glue: + la %r2,SP_PTREGS(%r15) # load pt_regs as parameter + jg sys_rt_sigreturn # branch to sys_sigreturn + +#ifdef CONFIG_S390_SUPPORT +sys32_rt_sigreturn_glue: + la %r2,SP_PTREGS(%r15) # load pt_regs as parameter + jg sys32_rt_sigreturn # branch to sys32_sigreturn +#endif + +# +# sigsuspend and rt_sigsuspend need pt_regs as an additional +# parameter and they have to skip the store of %r2 into the +# user register %r2 because the return value was set in +# sigsuspend and rt_sigsuspend already and must not be overwritten! +# + +sys_sigsuspend_glue: + lgr %r5,%r4 # move mask back + lgr %r4,%r3 # move history1 parameter + lgr %r3,%r2 # move history0 parameter + la %r2,SP_PTREGS(%r15) # load pt_regs as first parameter + la %r14,6(%r14) # skip store of return value + jg sys_sigsuspend # branch to sys_sigsuspend + +#ifdef CONFIG_S390_SUPPORT +sys32_sigsuspend_glue: + llgfr %r4,%r4 # unsigned long + lgr %r5,%r4 # move mask back + lgfr %r3,%r3 # int + lgr %r4,%r3 # move history1 parameter + lgfr %r2,%r2 # int + lgr %r3,%r2 # move history0 parameter + la %r2,SP_PTREGS(%r15) # load pt_regs as first parameter + la %r14,6(%r14) # skip store of return value + jg sys32_sigsuspend # branch to sys32_sigsuspend +#endif + +sys_rt_sigsuspend_glue: + lgr %r4,%r3 # move sigsetsize parameter + lgr %r3,%r2 # move unewset parameter + la %r2,SP_PTREGS(%r15) # load pt_regs as first parameter + la %r14,6(%r14) # skip store of return value + jg sys_rt_sigsuspend # branch to sys_rt_sigsuspend + +#ifdef CONFIG_S390_SUPPORT +sys32_rt_sigsuspend_glue: + llgfr %r3,%r3 # size_t + lgr %r4,%r3 # move sigsetsize parameter + llgtr %r2,%r2 # sigset_emu31_t * + lgr %r3,%r2 # move unewset parameter + la %r2,SP_PTREGS(%r15) # load pt_regs as first parameter + la %r14,6(%r14) # skip store of return value + jg sys32_rt_sigsuspend # branch to sys32_rt_sigsuspend +#endif + +sys_sigaltstack_glue: + la %r4,SP_PTREGS(%r15) # load pt_regs as parameter + jg sys_sigaltstack # branch to sys_sigreturn + +#ifdef CONFIG_S390_SUPPORT +sys32_sigaltstack_glue: + la %r4,SP_PTREGS(%r15) # load pt_regs as parameter + jg sys32_sigaltstack_wrapper # branch to sys_sigreturn +#endif + +/* + * Program check handler routine + */ + + .globl pgm_check_handler +pgm_check_handler: +/* + * First we need to check for a special case: + * Single stepping an instruction that disables the PER event mask will + * cause a PER event AFTER the mask has been set. Example: SVC or LPSW. + * For a single stepped SVC the program check handler gets control after + * the SVC new PSW has been loaded. But we want to execute the SVC first and + * then handle the PER event. Therefore we update the SVC old PSW to point + * to the pgm_check_handler and branch to the SVC handler after we checked + * if we have to load the kernel stack register. + * For every other possible cause for PER event without the PER mask set + * we just ignore the PER event (FIXME: is there anything we have to do + * for LPSW?). + */ + STORE_TIMER __LC_SYNC_ENTER_TIMER + SAVE_ALL_BASE __LC_SAVE_AREA + tm __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception + jnz pgm_per # got per exception -> special case + SAVE_ALL __LC_PGM_OLD_PSW,__LC_SAVE_AREA,1 +#ifdef CONFIG_VIRT_CPU_ACCOUNTING + 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 +pgm_no_vtime: +#endif + lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct + lgf %r3,__LC_PGM_ILC # load program interruption code + lghi %r8,0x7f + ngr %r8,%r3 +pgm_do_call: + 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 + larl %r14,sysc_return + br %r1 # branch to interrupt-handler + +# +# 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 + lmg %r12,%r15,__LC_SAVE_AREA + lpswe __LC_PGM_OLD_PSW + +# +# Normal per exception +# +pgm_per_std: + SAVE_ALL __LC_PGM_OLD_PSW,__LC_SAVE_AREA,1 +#ifdef CONFIG_VIRT_CPU_ACCOUNTING + 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 +pgm_no_vtime2: +#endif + lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct + lg %r1,__TI_task(%r9) + mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID + mvc __THREAD_per+__PER_address(8,%r1),__LC_PER_ADDRESS + mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID + oi __TI_flags+7(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP + lgf %r3,__LC_PGM_ILC # load program interruption code + lghi %r8,0x7f + ngr %r8,%r3 # clear per-event-bit and ilc + je sysc_return + j pgm_do_call + +# +# it was a single stepped SVC that is causing all the trouble +# +pgm_svcper: + SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1 +#ifdef CONFIG_VIRT_CPU_ACCOUNTING + tm SP_PSW+1(%r15),0x01 # interrupting from user ? + jz pgm_no_vtime3 + 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_vtime3: +#endif + llgh %r7,__LC_SVC_INT_CODE # get svc number from lowcore + lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct + lg %r1,__TI_task(%r9) + mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID + mvc __THREAD_per+__PER_address(8,%r1),__LC_PER_ADDRESS + mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID + oi __TI_flags+7(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP + stosm __SF_EMPTY(%r15),0x03 # reenable interrupts + j sysc_do_svc + +/* + * IO interrupt handler routine + */ + .globl io_int_handler +io_int_handler: + STORE_TIMER __LC_ASYNC_ENTER_TIMER + stck __LC_INT_CLOCK + SAVE_ALL_BASE __LC_SAVE_AREA+32 + SAVE_ALL __LC_IO_OLD_PSW,__LC_SAVE_AREA+32,0 +#ifdef CONFIG_VIRT_CPU_ACCOUNTING + 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 +io_no_vtime: +#endif + lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct + la %r2,SP_PTREGS(%r15) # address of register-save area + brasl %r14,do_IRQ # call standard irq handler + +io_return: + tm SP_PSW+1(%r15),0x01 # returning to user ? +#ifdef CONFIG_PREEMPT + jno io_preempt # no -> check for preemptive scheduling +#else + jno io_leave # no-> skip resched & signal +#endif + tm __TI_flags+7(%r9),_TIF_WORK_INT + jnz io_work # there is work to do (signals etc.) +io_leave: + RESTORE_ALL 0 + +#ifdef CONFIG_PREEMPT +io_preempt: + icm %r0,15,__TI_precount(%r9) + jnz io_leave + # 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 +io_resume_loop: + tm __TI_flags+7(%r9),_TIF_NEED_RESCHED + jno io_leave + larl %r1,.Lc_pactive + mvc __TI_precount(4,%r9),0(%r1) + stosm __SF_EMPTY(%r15),0x03 # reenable interrupts + brasl %r14,schedule # call schedule + stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts + xc __TI_precount(4,%r9),__TI_precount(%r9) + j io_resume_loop +#endif + +# +# switch to kernel stack, then check TIF bits +# +io_work: + 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 and _TIF_NEED_RESCHED +# +io_work_loop: + tm __TI_flags+7(%r9),_TIF_NEED_RESCHED + jo io_reschedule + tm __TI_flags+7(%r9),_TIF_SIGPENDING + jo io_sigpending + j io_leave + +# +# _TIF_NEED_RESCHED is set, call schedule +# +io_reschedule: + stosm __SF_EMPTY(%r15),0x03 # reenable interrupts + brasl %r14,schedule # call scheduler + stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts + tm __TI_flags+7(%r9),_TIF_WORK_INT + jz io_leave # there is no work to do + j io_work_loop + +# +# _TIF_SIGPENDING is set, call do_signal +# +io_sigpending: + stosm __SF_EMPTY(%r15),0x03 # reenable interrupts + la %r2,SP_PTREGS(%r15) # load pt_regs + slgr %r3,%r3 # clear *oldset + brasl %r14,do_signal # call do_signal + stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts + j sysc_leave # out of here, do NOT recheck + +/* + * External interrupt handler routine + */ + .globl ext_int_handler +ext_int_handler: + STORE_TIMER __LC_ASYNC_ENTER_TIMER + stck __LC_INT_CLOCK + SAVE_ALL_BASE __LC_SAVE_AREA+32 + SAVE_ALL __LC_EXT_OLD_PSW,__LC_SAVE_AREA+32,0 +#ifdef CONFIG_VIRT_CPU_ACCOUNTING + 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 +ext_no_vtime: +#endif + lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct + la %r2,SP_PTREGS(%r15) # address of register-save area + llgh %r3,__LC_EXT_INT_CODE # get interruption code + brasl %r14,do_extint + j io_return + +/* + * Machine check handler routines + */ + .globl mcck_int_handler +mcck_int_handler: + STORE_TIMER __LC_ASYNC_ENTER_TIMER + SAVE_ALL_BASE __LC_SAVE_AREA+64 + SAVE_ALL __LC_MCK_OLD_PSW,__LC_SAVE_AREA+64,0 +#ifdef CONFIG_VIRT_CPU_ACCOUNTING + tm SP_PSW+1(%r15),0x01 # interrupting from user ? + jz mcck_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 +mcck_no_vtime: +#endif + brasl %r14,s390_do_machine_check +mcck_return: + RESTORE_ALL 0 + +#ifdef CONFIG_SMP +/* + * Restart interruption handler, kick starter for additional CPUs + */ + .globl restart_int_handler +restart_int_handler: + 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 + stosm __SF_EMPTY(%r15),0x04 # now we can turn dat on + jg start_secondary +#else +/* + * If we do not run with SMP enabled, let the new CPU crash ... + */ + .globl restart_int_handler +restart_int_handler: + basr %r1,0 +restart_base: + lpswe restart_crash-restart_base(%r1) + .align 8 +restart_crash: + .long 0x000a0000,0x00000000,0x00000000,0x00000000 +restart_go: +#endif + +#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 %r1,-SP_SIZE + mvc SP_PSW(16,%r15),0(%r12) # move user PSW to stack + stmg %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 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+16 +0: mvc SP_R12(32,%r15),0(%r1) # move %r12-%r15 to stack + 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_return: + .quad sysc_return, sysc_leave +cleanup_table_sysc_leave: + .quad sysc_leave, sysc_work_loop +cleanup_table_sysc_work_loop: + .quad sysc_work_loop, sysc_reschedule + +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_return) + jl 0f + clc 8(8,%r12),BASED(cleanup_table_sysc_return+8) + jl cleanup_sysc_return +0: + clc 8(8,%r12),BASED(cleanup_table_sysc_leave) + jl 0f + clc 8(8,%r12),BASED(cleanup_table_sysc_leave+8) + jl cleanup_sysc_leave +0: + clc 8(8,%r12),BASED(cleanup_table_sysc_work_loop) + jl 0f + clc 8(8,%r12),BASED(cleanup_table_sysc_work_loop+8) + jl cleanup_sysc_leave +0: + br %r14 + +cleanup_system_call: + mvc __LC_RETURN_PSW(16),0(%r12) +#ifdef CONFIG_VIRT_CPU_ACCOUNTING + clc __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+8) + jh 0f + mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER +0: clc __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+16) + jhe cleanup_vtime +#endif + clc __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn) + jh 0f + mvc __LC_SAVE_AREA(32),__LC_SAVE_AREA+32 +0: stg %r13,__LC_SAVE_AREA+40 + SAVE_ALL __LC_SVC_OLD_PSW,__LC_SAVE_AREA,1 + stg %r15,__LC_SAVE_AREA+56 + llgh %r7,__LC_SVC_INT_CODE +#ifdef CONFIG_VIRT_CPU_ACCOUNTING +cleanup_vtime: + clc __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+24) + jhe cleanup_stime + tm SP_PSW+1(%r15),0x01 # interrupting from user ? + jz cleanup_novtime + 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 +cleanup_novtime: +#endif + 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 +#ifdef CONFIG_VIRT_CPU_ACCOUNTING + .quad system_call + .quad sysc_vtime + .quad sysc_stime + .quad sysc_update +#endif + +cleanup_sysc_return: + mvc __LC_RETURN_PSW(8),0(%r12) + mvc __LC_RETURN_PSW+8(8),BASED(cleanup_table_sysc_return) + la %r12,__LC_RETURN_PSW + br %r14 + +cleanup_sysc_leave: + clc 8(8,%r12),BASED(cleanup_sysc_leave_insn) + je 0f +#ifdef CONFIG_VIRT_CPU_ACCOUNTING + mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER + clc 8(8,%r12),BASED(cleanup_sysc_leave_insn+8) + je 0f +#endif + mvc __LC_RETURN_PSW(16),SP_PSW(%r15) + mvc __LC_SAVE_AREA+32(32),SP_R12(%r15) + lmg %r0,%r11,SP_R0(%r15) + lg %r15,SP_R15(%r15) +0: la %r12,__LC_RETURN_PSW + br %r14 +cleanup_sysc_leave_insn: +#ifdef CONFIG_VIRT_CPU_ACCOUNTING + .quad sysc_leave + 16 +#endif + .quad sysc_leave + 12 + +/* + * Integer constants + */ + .align 4 +.Lconst: +.Lc_pactive: .long PREEMPT_ACTIVE +.Lnr_syscalls: .long NR_syscalls +.L0x0130: .short 0x130 +.L0x0140: .short 0x140 +.L0x0150: .short 0x150 +.L0x0160: .short 0x160 +.L0x0170: .short 0x170 +.Lcritical_start: + .quad __critical_start +.Lcritical_end: + .quad __critical_end + +#define SYSCALL(esa,esame,emu) .long esame + .globl sys_call_table +sys_call_table: +#include "syscalls.S" +#undef SYSCALL + +#ifdef CONFIG_S390_SUPPORT + +#define SYSCALL(esa,esame,emu) .long emu + .globl sys_call_table_emu +sys_call_table_emu: +#include "syscalls.S" +#undef SYSCALL +#endif |
