/* * 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 #include #include #include #include #include #include #include /* * 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_PSW = STACK_FRAME_OVERHEAD + PT_PSWMASK SP_R0 = STACK_FRAME_OVERHEAD + PT_GPR0 SP_R1 = STACK_FRAME_OVERHEAD + PT_GPR1 SP_R2 = STACK_FRAME_OVERHEAD + PT_GPR2 SP_R3 = STACK_FRAME_OVERHEAD + PT_GPR3 SP_R4 = STACK_FRAME_OVERHEAD + PT_GPR4 SP_R5 = STACK_FRAME_OVERHEAD + PT_GPR5 SP_R6 = STACK_FRAME_OVERHEAD + PT_GPR6 SP_R7 = STACK_FRAME_OVERHEAD + PT_GPR7 SP_R8 = STACK_FRAME_OVERHEAD + PT_GPR8 SP_R9 = STACK_FRAME_OVERHEAD + PT_GPR9 SP_R10 = STACK_FRAME_OVERHEAD + PT_GPR10 SP_R11 = STACK_FRAME_OVERHEAD + PT_GPR11 SP_R12 = STACK_FRAME_OVERHEAD + PT_GPR12 SP_R13 = STACK_FRAME_OVERHEAD + PT_GPR13 SP_R14 = STACK_FRAME_OVERHEAD + PT_GPR14 SP_R15 = STACK_FRAME_OVERHEAD + PT_GPR15 SP_AREGS = STACK_FRAME_OVERHEAD + PT_ACR0 SP_ORIG_R2 = STACK_FRAME_OVERHEAD + PT_ORIGGPR2 /* Now the additional entries */ SP_TRAP = (SP_ORIG_R2+GPR_SIZE) #if CONFIG_REMOTE_DEBUG SP_CRREGS = (SP_TRAP+4) /* fpu registers are saved & restored by the gdb stub itself */ SP_FPC = (SP_CRREGS+(NUM_CRS*CR_SIZE)) SP_FPRS = (SP_FPC+FPC_SIZE+FPC_PAD_SIZE) SP_PGM_OLD_ILC= (SP_FPRS+(NUM_FPRS*FPR_SIZE)) #else SP_PGM_OLD_ILC= (SP_TRAP+4) #endif SP_SIZE = (SP_PGM_OLD_ILC+4) /* * these defines are offsets into the thread_struct */ _TSS_PTREGS = 0 _TSS_FPRS = (_TSS_PTREGS+8) _TSS_AR2 = (_TSS_FPRS+136) _TSS_AR4 = (_TSS_AR2+4) _TSS_KSP = (_TSS_AR4+4) _TSS_USERSEG = (_TSS_KSP+8) _TSS_PROT = (_TSS_USERSEG+8) _TSS_ERROR = (_TSS_PROT+8) _TSS_TRAP = (_TSS_ERROR+4) _TSS_PER = (_TSS_TRAP+4) _TSS_IEEE = (_TSS_PER+72) _TSS_FLAGS = (_TSS_IEEE+8) /* * these are offsets into the task-struct. */ state = 0 flags = 8 sigpending = 16 need_resched = 32 tsk_ptrace = 40 processor = 92 /* * 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 psworg,sync # system entry macro stmg %r14,%r15,__LC_SAVE_AREA tm \psworg+1,0x01 # test problem state bit stam %a2,%a4,__LC_SAVE_AREA+16 .if \sync jz 1f # skip stack setup save .else jnz 0f # from user -> load kernel stack lg %r14,__LC_ASYNC_STACK # are we already on the async. stack ? slgr %r14,%r15 srag %r14,%r14,14 jz 1f lg %r15,__LC_ASYNC_STACK # load async. stack j 1f .endif 0: lg %r15,__LC_KERNEL_STACK # problem state -> load ksp larl %r14,.Lc_ac lam %a2,%a4,0(%r14) 1: aghi %r15,-SP_SIZE # make room for registers & psw nill %r15,0xfff8 # align stack pointer to 8 stmg %r0,%r14,SP_R0(%r15) # store gprs 0-14 to kernel stack stg %r2,SP_ORIG_R2(%r15) # store original content of gpr 2 mvc SP_R14(16,%r15),__LC_SAVE_AREA # move R15 to stack stam %a0,%a15,SP_AREGS(%r15) # store access registers to kst. mvc SP_AREGS+8(12,%r15),__LC_SAVE_AREA+16 # store ac. regs mvc SP_PSW(16,%r15),\psworg # move user PSW to stack lhi %r0,\psworg # store trap indication st %r0,SP_TRAP(%r15) xc 0(8,%r15),0(%r15) # clear back chain .endm .macro RESTORE_ALL sync # system exit macro mvc __LC_RETURN_PSW(16),SP_PSW(%r15) # move user PSW to lowcore lam %a0,%a15,SP_AREGS(%r15) # load the access registers lmg %r0,%r15,SP_R0(%r15) # load gprs 0-15 of user ni __LC_RETURN_PSW+1,0xfd # clear wait state bit lpswe __LC_RETURN_PSW # back to caller .endm .macro GET_CURRENT lg %r9,__LC_KERNEL_STACK # load pointer to task_struct to %r9 aghi %r9,-16384 .endm /* * Scheduler resume function, called by switch_to * grp2 = (thread_struct *) prev->tss * grp3 = (thread_struct *) next->tss * Returns: * gpr2 = prev */ .globl resume resume: lg %r4,_TSS_PTREGS(%r3) tm SP_PSW-SP_PTREGS(%r4),0x40 # is the new process using per ? jz resume_noper # if not we're fine stctg %c9,%c11,48(%r15) # We are using per stuff clc _TSS_PER(24,%r3),48(%r15) je resume_noper # we got away without bashing TLB's lctlg %c9,%c11,_TSS_PER(%r3) # Nope we didn't resume_noper: stmg %r6,%r15,48(%r15) # store resume registers of prev task stg %r15,_TSS_KSP(%r2) # store kernel stack ptr to prev->tss.ksp lghi %r0,-16384 ngr %r0,%r15 lg %r15,_TSS_KSP(%r3) # load kernel stack ptr from next->tss.ksp lghi %r1,16383 ogr %r1,%r15 aghi %r1,1 stg %r1,__LC_KERNEL_STACK # __LC_KERNEL_STACK = new kernel stack stam %a2,%a2,_TSS_AR2(%r2) # store kernel access reg. 2 stam %a4,%a4,_TSS_AR4(%r2) # store kernel access reg. 4 lam %a2,%a2,_TSS_AR2(%r3) # load kernel access reg. 2 lam %a4,%a4,_TSS_AR4(%r3) # load kernel access reg. 4 lgr %r2,%r0 # return task_struct of last task lmg %r6,%r15,48(%r15) # load resume registers of next task br %r14 /* * do_softirq calling function. We want to run the softirq functions on the * asynchronous interrupt stack. */ .global do_call_softirq do_call_softirq: stmg %r12,%r15,48(%r15) lgr %r12,%r15 lg %r0,__LC_ASYNC_STACK slgr %r0,%r15 srag %r0,%r0,14 je 0f lg %r15,__LC_ASYNC_STACK 0: aghi %r15,-STACK_FRAME_OVERHEAD stg %r12,0(%r15) # store back chain brasl %r14,do_softirq lmg %r12,%r15,48(%r12) br %r14 /* * SVC interrupt handler routine. System calls are synchronous events and * are executed with interrupts enabled. */ .globl system_call system_call: SAVE_ALL __LC_SVC_OLD_PSW,1 mvi SP_PGM_OLD_ILC(%r15),1 # mark PGM_OLD_ILC as invalid pgm_system_call: GET_CURRENT # load pointer to task_struct to R9 larl %r7,sys_call_table llgc %r8,__LC_SVC_INT_CODE+1 # get svc number from lowcore stosm 48(%r15),0x03 # reenable interrupts sll %r8,3 tm SP_PSW+3(%r15),0x01 # are we running in 31 bit mode ? jo sysc_noemu la %r8,4(%r8) # use 31 bit emulation system calls sysc_noemu: lgf %r8,0(%r8,%r7) # load address of system call routine tm tsk_ptrace+7(%r9),0x02 # PT_TRACESYS 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 # no-> skip bottom half, resched & signal # # check, if reschedule is needed # lg %r0,need_resched(%r9) # get need_resched from task_struct ltgr %r0,%r0 jnz sysc_reschedule icm %r0,15,sigpending(%r9) # get sigpending from task_struct jnz sysc_signal_return sysc_leave: tm SP_PGM_OLD_ILC(%r15),0xff jz pgm_svcret stnsm 48(%r15),0xfc # disable I/O and ext. interrupts RESTORE_ALL 1 # # call do_signal before return # sysc_signal_return: la %r2,SP_PTREGS(%r15) # load pt_regs sgr %r3,%r3 # clear *oldset larl %r14,sysc_leave jg do_signal # return point is sysc_leave # # call trace before and after sys_call # sysc_tracesys: lghi %r2,-ENOSYS stg %r2,SP_R2(%r15) # give sysc_trace an -ENOSYS retval brasl %r14,syscall_trace lg %r2,SP_R2(%r15) cghi %r2,-ENOSYS je sysc_tracesys_dn1 sllg %r2,%r2,56 # strace wants to change the syscall srlg %r2,%r2,53 # zap unused bits & multiply by 8 tm SP_PSW+3(%r15),0x01 # are we running in 31 bit mode ? jo sysc_tracesys_noemu la %r2,4(%r2) # use 31 bit emulation system calls sysc_tracesys_noemu: lgf %r8,0(%r2,%r7) # load address of system call routine sysc_tracesys_dn1: 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 larl %r14,sysc_return jg syscall_trace # return point is sysc_return # # call schedule with sysc_return as return-address # sysc_reschedule: larl %r14,sysc_return jg schedule # return point is sysc_return # # a new process exits the kernel with ret_from_fork # .globl ret_from_fork ret_from_fork: GET_CURRENT # load pointer to task_struct to R9 stosm 48(%r15),0x03 # reenable interrupts xc SP_R2(8,%r15),SP_R2(%r15) # child returns 0 #ifdef CONFIG_SMP larl %r14,sysc_return jg schedule_tail # return to sysc_return #else j sysc_return #endif # # 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 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 #ifdef CONFIG_S390_SUPPORT #define SYSCALL(esame,esa) esame,esa #else #define SYSCALL(esame,esa) esame,sys_ni_syscall #endif .globl sys_call_table sys_call_table: .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* 0 */ .long SYSCALL(sys_exit,sys32_exit_wrapper) .long SYSCALL(sys_fork_glue,sys_fork_glue) .long SYSCALL(sys_read,sys32_read_wrapper) .long SYSCALL(sys_write,sys32_write_wrapper) .long SYSCALL(sys_open,sys32_open_wrapper) /* 5 */ .long SYSCALL(sys_close,sys32_close_wrapper) .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* old waitpid syscall */ .long SYSCALL(sys_creat,sys32_creat_wrapper) .long SYSCALL(sys_link,sys32_link_wrapper) .long SYSCALL(sys_unlink,sys32_unlink_wrapper) /* 10 */ .long SYSCALL(sys_execve_glue,sys32_execve_glue) .long SYSCALL(sys_chdir,sys32_chdir_wrapper) .long SYSCALL(sys_ni_syscall,sys32_time_wrapper) /* old time syscall */ .long SYSCALL(sys_mknod,sys32_mknod_wrapper) .long SYSCALL(sys_chmod,sys32_chmod_wrapper) /* 15 */ .long SYSCALL(sys_ni_syscall,sys32_lchown16_wrapper) /* old lchown16 syscall*/ .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* old break syscall */ .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* old stat syscall */ .long SYSCALL(sys_lseek,sys32_lseek_wrapper) .long SYSCALL(sys_getpid,sys_getpid) /* 20 */ .long SYSCALL(sys_mount,sys32_mount_wrapper) .long SYSCALL(sys_oldumount,sys32_oldumount_wrapper) .long SYSCALL(sys_ni_syscall,sys32_setuid16_wrapper) /* old setuid16 syscall*/ .long SYSCALL(sys_ni_syscall,sys32_getuid16) /* old getuid16 syscall*/ .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* 25 old stime syscall */ .long SYSCALL(sys_ptrace,sys32_ptrace_wrapper) .long SYSCALL(sys_alarm,sys32_alarm_wrapper) .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* old fstat syscall */ .long SYSCALL(sys_pause,sys32_pause) .long SYSCALL(sys_utime,sys32_utime_wrapper) /* 30 */ .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* old stty syscall */ .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* old gtty syscall */ .long SYSCALL(sys_access,sys32_access_wrapper) .long SYSCALL(sys_nice,sys32_nice_wrapper) .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* old ftime syscall */ .long SYSCALL(sys_sync,sys_sync) .long SYSCALL(sys_kill,sys32_kill_wrapper) .long SYSCALL(sys_rename,sys32_rename_wrapper) .long SYSCALL(sys_mkdir,sys32_mkdir_wrapper) .long SYSCALL(sys_rmdir,sys32_rmdir_wrapper) /* 40 */ .long SYSCALL(sys_dup,sys32_dup_wrapper) .long SYSCALL(sys_pipe,sys32_pipe_wrapper) .long SYSCALL(sys_times,sys32_times_wrapper) .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* old prof syscall */ .long SYSCALL(sys_brk,sys32_brk_wrapper) /* 45 */ .long SYSCALL(sys_ni_syscall,sys32_setgid16) /* old setgid16 syscall*/ .long SYSCALL(sys_ni_syscall,sys32_getgid16) /* old getgid16 syscall*/ .long SYSCALL(sys_signal,sys32_signal_wrapper) .long SYSCALL(sys_ni_syscall,sys32_geteuid16) /* old geteuid16 syscall */ .long SYSCALL(sys_ni_syscall,sys32_getegid16) /* old getegid16 syscall */ .long SYSCALL(sys_acct,sys32_acct_wrapper) .long SYSCALL(sys_umount,sys32_umount_wrapper) .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* old lock syscall */ .long SYSCALL(sys_ioctl,sys32_ioctl_wrapper) .long SYSCALL(sys_fcntl,sys32_fcntl_wrapper) /* 55 */ .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* intel mpx syscall */ .long SYSCALL(sys_setpgid,sys32_setpgid_wrapper) .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* old ulimit syscall */ .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* old uname syscall */ .long SYSCALL(sys_umask,sys32_umask_wrapper) /* 60 */ .long SYSCALL(sys_chroot,sys32_chroot_wrapper) .long SYSCALL(sys_ustat,sys32_ustat_wrapper) .long SYSCALL(sys_dup2,sys32_dup2_wrapper) .long SYSCALL(sys_getppid,sys_getppid) .long SYSCALL(sys_getpgrp,sys_getpgrp) /* 65 */ .long SYSCALL(sys_setsid,sys_setsid) .long SYSCALL(sys_sigaction,sys32_sigaction_wrapper) .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* old sgetmask syscall*/ .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* old ssetmask syscall*/ .long SYSCALL(sys_ni_syscall,sys32_setreuid16_wrapper) /* old setreuid16 syscall */ .long SYSCALL(sys_ni_syscall,sys32_setregid16_wrapper) /* old setregid16 syscall */ .long SYSCALL(sys_sigsuspend_glue,sys32_sigsuspend_glue) .long SYSCALL(sys_sigpending,sys32_sigpending_wrapper) .long SYSCALL(sys_sethostname,sys32_sethostname_wrapper) .long SYSCALL(sys_setrlimit,sys32_setrlimit_wrapper) /* 75 */ .long SYSCALL(sys_getrlimit,sys32_old_getrlimit_wrapper) .long SYSCALL(sys_getrusage,sys32_getrusage_wrapper) .long SYSCALL(sys_gettimeofday,sys32_gettimeofday_wrapper) .long SYSCALL(sys_settimeofday,sys32_settimeofday_wrapper) .long SYSCALL(sys_ni_syscall,sys32_getgroups16_wrapper) /* old getgroups16 syscall */ .long SYSCALL(sys_ni_syscall,sys32_setgroups16_wrapper) /* old setgroups16 syscall */ .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* old select syscall */ .long SYSCALL(sys_symlink,sys32_symlink_wrapper) .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* old lstat syscall */ .long SYSCALL(sys_readlink,sys32_readlink_wrapper) /* 85 */ .long SYSCALL(sys_uselib,sys32_uselib_wrapper) .long SYSCALL(sys_swapon,sys32_swapon_wrapper) .long SYSCALL(sys_reboot,sys32_reboot_wrapper) .long SYSCALL(sys_ni_syscall,old32_readdir_wrapper) /* old readdir syscall */ .long SYSCALL(old_mmap,old32_mmap_wrapper) /* 90 */ .long SYSCALL(sys_munmap,sys32_munmap_wrapper) .long SYSCALL(sys_truncate,sys32_truncate_wrapper) .long SYSCALL(sys_ftruncate,sys32_ftruncate_wrapper) .long SYSCALL(sys_fchmod,sys32_fchmod_wrapper) .long SYSCALL(sys_ni_syscall,sys32_fchown16_wrapper) /* old fchown16 syscall*/ .long SYSCALL(sys_getpriority,sys32_getpriority_wrapper) .long SYSCALL(sys_setpriority,sys32_setpriority_wrapper) .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* old profil syscall */ .long SYSCALL(sys_statfs,sys32_statfs_wrapper) .long SYSCALL(sys_fstatfs,sys32_fstatfs_wrapper) /* 100 */ .long SYSCALL(sys_ni_syscall,sys_ni_syscall) .long SYSCALL(sys_socketcall,sys32_socketcall_wrapper) .long SYSCALL(sys_syslog,sys32_syslog_wrapper) .long SYSCALL(sys_setitimer,sys32_setitimer_wrapper) .long SYSCALL(sys_getitimer,sys32_getitimer_wrapper) /* 105 */ .long SYSCALL(sys_newstat,sys32_newstat_wrapper) .long SYSCALL(sys_newlstat,sys32_newlstat_wrapper) .long SYSCALL(sys_newfstat,sys32_newfstat_wrapper) .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* old uname syscall */ .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* iopl for i386 */ .long SYSCALL(sys_vhangup,sys_vhangup) .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* old "idle" system call */ .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* vm86old for i386 */ .long SYSCALL(sys_wait4,sys32_wait4_wrapper) .long SYSCALL(sys_swapoff,sys32_swapoff_wrapper) /* 115 */ .long SYSCALL(sys_sysinfo,sys32_sysinfo_wrapper) .long SYSCALL(sys_ipc,sys32_ipc_wrapper) .long SYSCALL(sys_fsync,sys32_fsync_wrapper) .long SYSCALL(sys_sigreturn_glue,sys32_sigreturn_glue) .long SYSCALL(sys_clone_glue,sys_clone_glue) /* 120 */ .long SYSCALL(sys_setdomainname,sys32_setdomainname_wrapper) .long SYSCALL(sys_newuname,sys32_newuname_wrapper) .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* modify_ldt for i386 */ .long SYSCALL(sys_adjtimex,sys32_adjtimex_wrapper) .long SYSCALL(sys_mprotect,sys32_mprotect_wrapper) /* 125 */ .long SYSCALL(sys_sigprocmask,sys32_sigprocmask_wrapper) .long SYSCALL(sys_create_module,sys32_create_module_wrapper) .long SYSCALL(sys_init_module,sys32_init_module_wrapper) .long SYSCALL(sys_delete_module,sys32_delete_module_wrapper) .long SYSCALL(sys_get_kernel_syms,sys32_get_kernel_syms_wrapper) /* 130 */ .long SYSCALL(sys_quotactl,sys32_quotactl_wrapper) .long SYSCALL(sys_getpgid,sys32_getpgid_wrapper) .long SYSCALL(sys_fchdir,sys32_fchdir_wrapper) .long SYSCALL(sys_bdflush,sys32_bdflush_wrapper) .long SYSCALL(sys_sysfs,sys32_sysfs_wrapper) /* 135 */ .long SYSCALL(sys_personality,sys32_personality_wrapper) .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* for afs_syscall */ .long SYSCALL(sys_ni_syscall,sys32_setfsuid16_wrapper) /* old setfsuid16 syscall */ .long SYSCALL(sys_ni_syscall,sys32_setfsgid16_wrapper) /* old setfsgid16 syscall */ .long SYSCALL(sys_llseek,sys32_llseek_wrapper) /* 140 */ .long SYSCALL(sys_getdents,sys32_getdents_wrapper) .long SYSCALL(sys_select,sys32_select_wrapper) .long SYSCALL(sys_flock,sys32_flock_wrapper) .long SYSCALL(sys_msync,sys32_msync_wrapper) .long SYSCALL(sys_readv,sys32_readv_wrapper) /* 145 */ .long SYSCALL(sys_writev,sys32_writev_wrapper) .long SYSCALL(sys_getsid,sys32_getsid_wrapper) .long SYSCALL(sys_fdatasync,sys32_fdatasync_wrapper) .long SYSCALL(sys_sysctl,sys_ni_syscall) .long SYSCALL(sys_mlock,sys32_mlock_wrapper) /* 150 */ .long SYSCALL(sys_munlock,sys32_munlock_wrapper) .long SYSCALL(sys_mlockall,sys32_mlockall_wrapper) .long SYSCALL(sys_munlockall,sys_munlockall) .long SYSCALL(sys_sched_setparam,sys32_sched_setparam_wrapper) .long SYSCALL(sys_sched_getparam,sys32_sched_getparam_wrapper) /* 155 */ .long SYSCALL(sys_sched_setscheduler,sys32_sched_setscheduler_wrapper) .long SYSCALL(sys_sched_getscheduler,sys32_sched_getscheduler_wrapper) .long SYSCALL(sys_sched_yield,sys_sched_yield) .long SYSCALL(sys_sched_get_priority_max,sys32_sched_get_priority_max_wrapper) .long SYSCALL(sys_sched_get_priority_min,sys32_sched_get_priority_min_wrapper) .long SYSCALL(sys_sched_rr_get_interval,sys32_sched_rr_get_interval_wrapper) .long SYSCALL(sys_nanosleep,sys32_nanosleep_wrapper) .long SYSCALL(sys_mremap,sys32_mremap_wrapper) .long SYSCALL(sys_ni_syscall,sys32_setresuid16_wrapper) /* old setresuid16 syscall */ .long SYSCALL(sys_ni_syscall,sys32_getresuid16_wrapper) /* old getresuid16 syscall */ .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* for vm86 */ .long SYSCALL(sys_query_module,sys32_query_module_wrapper) .long SYSCALL(sys_poll,sys32_poll_wrapper) .long SYSCALL(sys_nfsservctl,sys32_nfsservctl_wrapper) .long SYSCALL(sys_ni_syscall,sys32_setresgid16_wrapper) /* old setresgid16 syscall */ .long SYSCALL(sys_ni_syscall,sys32_getresgid16_wrapper) /* old getresgid16 syscall */ .long SYSCALL(sys_prctl,sys32_prctl_wrapper) .long SYSCALL(sys_rt_sigreturn_glue,sys32_rt_sigreturn_glue) .long SYSCALL(sys_rt_sigaction,sys32_rt_sigaction_wrapper) .long SYSCALL(sys_rt_sigprocmask,sys32_rt_sigprocmask_wrapper) /* 175 */ .long SYSCALL(sys_rt_sigpending,sys32_rt_sigpending_wrapper) .long SYSCALL(sys_rt_sigtimedwait,sys32_rt_sigtimedwait_wrapper) .long SYSCALL(sys_rt_sigqueueinfo,sys32_rt_sigqueueinfo_wrapper) .long SYSCALL(sys_rt_sigsuspend_glue,sys32_rt_sigsuspend_glue) .long SYSCALL(sys_pread,sys32_pread_wrapper) /* 180 */ .long SYSCALL(sys_pwrite,sys32_pwrite_wrapper) .long SYSCALL(sys_ni_syscall,sys32_chown16_wrapper) /* old chown16 syscall */ .long SYSCALL(sys_getcwd,sys32_getcwd_wrapper) .long SYSCALL(sys_capget,sys32_capget_wrapper) .long SYSCALL(sys_capset,sys32_capset_wrapper) /* 185 */ .long SYSCALL(sys_sigaltstack_glue,sys32_sigaltstack_glue) .long SYSCALL(sys_sendfile,sys32_sendfile_wrapper) .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* streams1 */ .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* streams2 */ .long SYSCALL(sys_vfork_glue,sys_vfork_glue) /* 190 */ .long SYSCALL(sys_getrlimit,sys32_old_getrlimit_wrapper) .long SYSCALL(sys_mmap2,sys32_mmap2_wrapper) .long SYSCALL(sys_ni_syscall,sys32_truncate64_wrapper) .long SYSCALL(sys_ni_syscall,sys32_ftruncate64_wrapper) .long SYSCALL(sys_ni_syscall,sys32_stat64_wrapper) /* 195 */ .long SYSCALL(sys_ni_syscall,sys32_lstat64_wrapper) .long SYSCALL(sys_ni_syscall,sys32_fstat64_wrapper) .long SYSCALL(sys_lchown,sys32_lchown_wrapper) .long SYSCALL(sys_getuid,sys_getuid) .long SYSCALL(sys_getgid,sys_getgid) /* 200 */ .long SYSCALL(sys_geteuid,sys_geteuid) .long SYSCALL(sys_getegid,sys_getegid) .long SYSCALL(sys_setreuid,sys32_setreuid_wrapper) .long SYSCALL(sys_setregid,sys32_setregid_wrapper) .long SYSCALL(sys_getgroups,sys32_getgroups_wrapper) /* 205 */ .long SYSCALL(sys_setgroups,sys32_setgroups_wrapper) .long SYSCALL(sys_fchown,sys32_fchown_wrapper) .long SYSCALL(sys_setresuid,sys32_setresuid_wrapper) .long SYSCALL(sys_getresuid,sys32_getresuid_wrapper) .long SYSCALL(sys_setresgid,sys32_setresgid_wrapper) /* 210 */ .long SYSCALL(sys_getresgid,sys32_getresgid_wrapper) .long SYSCALL(sys_chown,sys32_chown_wrapper) .long SYSCALL(sys_setuid,sys32_setuid_wrapper) .long SYSCALL(sys_setgid,sys32_setgid_wrapper) .long SYSCALL(sys_setfsuid,sys32_setfsuid_wrapper) /* 215 */ .long SYSCALL(sys_setfsgid,sys32_setfsgid_wrapper) .long SYSCALL(sys_pivot_root,sys32_pivot_root_wrapper) .long SYSCALL(sys_mincore,sys32_mincore_wrapper) .long SYSCALL(sys_madvise,sys32_madvise_wrapper) .long SYSCALL(sys_getdents64,sys32_getdents64_wrapper)/* 220 */ .long SYSCALL(sys_ni_syscall,sys32_fcntl64_wrapper) .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* 222 - reserved for posix_acl */ .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* 223 - reserved for posix_acl */ .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* 224 - reserved for posix_acl */ .rept 255-224 .long SYSCALL(sys_ni_syscall,sys_ni_syscall) .endr /* * 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?). */ tm __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception jz pgm_sv # skip if not tm __LC_PGM_OLD_PSW,0x40 # test if per event recording is on jnz pgm_sv # skip if it is # 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 # it was a single stepped SVC that is causing all the trouble pgm_svcper: SAVE_ALL __LC_SVC_OLD_PSW,1 mvc SP_PGM_OLD_ILC(4,%r15),__LC_PGM_ILC # save program check information j pgm_system_call # now do the svc pgm_svcret: lhi %r0,__LC_PGM_OLD_PSW # set trap indication back to pgm_chk st %r0,SP_TRAP(%r15) llgh %r7,SP_PGM_OLD_ILC(%r15) # get ilc from stack mvi SP_PGM_OLD_ILC(%r15),1 # mark PGM_OLD_ILC as invalid j pgm_no_sv pgm_sv: SAVE_ALL __LC_PGM_OLD_PSW,1 mvi SP_PGM_OLD_ILC(%r15),1 # mark PGM_OLD_ILC as invalid llgh %r7,__LC_PGM_ILC # load instruction length GET_CURRENT pgm_no_sv: llgh %r8,__LC_PGM_INT_CODE # N.B. saved int code used later KEEP it lghi %r3,0x7f nr %r3,%r8 # clear per-event-bit & move to r3 je pgm_dn # none of Martins exceptions occurred bypass sll %r3,3 larl %r1,pgm_check_table lg %r1,0(%r3,%r1) # load address of handler routine srl %r3,3 la %r2,SP_PTREGS(%r15) # address of register-save area chi %r3,0x4 # protection-exception ? jne pgm_go # if not, lg %r5,SP_PSW+8(15) # load psw addr slgr %r5,%r7 # substract ilc from psw stg %r5,SP_PSW+8(15) # store corrected psw addr pgm_go: basr %r14,%r1 # branch to interrupt-handler pgm_dn: nill %r8,0x80 # check for per exception je sysc_return la %r2,SP_PTREGS(15) # address of register-save area larl %r14,sysc_return # load adr. of system return jg handle_per_exception /* * IO interrupt handler routine */ .globl io_int_handler io_int_handler: SAVE_ALL __LC_IO_OLD_PSW,0 GET_CURRENT # load pointer to task_struct to R9 la %r2,SP_PTREGS(%r15) # address of register-save area llgh %r3,__LC_SUBCHANNEL_NR # load subchannel number llgf %r4,__LC_IO_INT_PARM # load interuption parm llgf %r5,__LC_IO_INT_WORD # load interuption word brasl %r14,do_IRQ # call standard irq handler io_return: # # check, if bottom-half has to be done # lgf %r1,processor(%r9) # get cpu number from task struture larl %r2,irq_stat sll %r1,L1_CACHE_SHIFT la %r1,0(%r1,%r2) icm %r0,15,0(%r1) # test irq_stat[#cpu].__softirq_pending jnz io_handle_bottom_half io_return_bh: tm SP_PSW+1(%r15),0x01 # returning to user ? jno io_leave # no-> skip resched & signal stosm 48(%r15),0x03 # reenable interrupts # # check, if reschedule is needed # lg %r0,need_resched(%r9) # get need_resched from task_struct ltgr %r0,%r0 jnz io_reschedule icm %r0,15,sigpending(%r9) # get sigpending from task_struct jnz io_signal_return io_leave: stnsm 48(%r15),0xfc # disable I/O and ext. interrupts RESTORE_ALL 0 # # call do_softirq and return from syscall, if interrupt-level # is zero # io_handle_bottom_half: larl %r14,io_return_bh jg do_softirq # return point is io_return_bh # # call schedule with io_return as return-address # io_reschedule: larl %r14,io_return jg schedule # call scheduler, return to io_return # # call do_signal before return # io_signal_return: la %r2,SP_PTREGS(%r15) # load pt_regs slgr %r3,%r3 # clear *oldset larl %r14,io_leave jg do_signal # return point is io_leave /* * External interrupt handler routine */ .globl ext_int_handler ext_int_handler: SAVE_ALL __LC_EXT_OLD_PSW,0 GET_CURRENT # load pointer to task_struct to R9 la %r2,SP_PTREGS(%r15) # address of register-save area llgh %r3,__LC_EXT_INT_CODE # error code lgr %r1,%r3 # calculate index = code & 0xff nill %r1,0xff sll %r1,3 larl %r4,ext_int_hash lg %r4,0(%r1,%r4) # get first list entry for hash value ltgr %r4,%r4 # == NULL ? jz io_return # yes, nothing to do, exit ext_int_loop: ch %r3,16(%r4) # compare external interrupt code je ext_int_found lg %r4,0(%r4) # next list entry ltgr %r4,%r4 jnz ext_int_loop j io_return ext_int_found: lg %r4,8(%r4) # get handler address larl %r14,io_return br %r4 # branch to ext call handler /* * Machine check handler routines */ .globl mcck_int_handler mcck_int_handler: SAVE_ALL __LC_MCK_OLD_PSW,0 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) stosm 0(%r15),0x04 # now we can turn dat on lmg %r6,%r15,48(%r15) # load registers from clone 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 /* * Integer constants */ .align 4 .Lc_ac: .long 0,0,1