entry.S
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上传日期:2013-04-10
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- /*
- * 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/smp.h>
- #include <asm/ptrace.h>
- #include "asm-offsets.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_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)
- SP_SIZE = (SP_TRAP+4)
- /*
- * 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
- * gpr2 = (task_struct *) prev
- * gpr3 = (task_struct *) next
- * Returns:
- * gpr2 = prev
- */
- .globl resume
- resume:
- tm __THREAD_per+4(%r3),0xe8 # 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 __THREAD_per(24,%r3),48(%r15)
- je resume_noper # we got away without bashing TLB's
- lctlg %c9,%c11,__THREAD_per(%r3) # Nope we didn't
- resume_noper:
- stmg %r6,%r15,48(%r15) # store resume 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
- stam %a2,%a2,__THREAD_ar2(%r2) # store kernel access reg. 2
- stam %a4,%a4,__THREAD_ar4(%r2) # store kernel access reg. 4
- lam %a2,%a2,__THREAD_ar2(%r3) # load kernel access reg. 2
- lam %a4,%a4,__THREAD_ar4(%r3) # load kernel access reg. 4
- lmg %r6,%r15,48(%r15) # load resume registers of next task
- aghi %r3,16384
- stg %r3,__LC_KERNEL_STACK # __LC_KERNEL_STACK = new kernel stack
- 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
- larl %r7,sys_call_table
- llgh %r8,__LC_SVC_INT_CODE # get svc number from lowcore
- sll %r8,3
- GET_CURRENT # load pointer to task_struct to R9
- stosm 48(%r15),0x03 # reenable interrupts
- 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 __TASK_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,__TASK_need_resched(%r9)
- ltgr %r0,%r0
- jnz sysc_reschedule
- icm %r0,15,__TASK_sigpending(%r9)
- jnz sysc_signal_return
- sysc_leave:
- 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 schedule with sysc_return as return-address
- #
- sysc_reschedule:
- larl %r14,sysc_return
- jg schedule # return point is sysc_return
- #
- # call trace before and after sys_call
- #
- sysc_tracesys:
- larl %r11,sysc_return
- #
- # call syscall_trace before and after system call
- # special linkage: %r11 contains the return address for trace_svc
- #
- trace_svc:
- lghi %r0,-ENOSYS
- stg %r0,SP_R2(%r15) # give sysc_trace an -ENOSYS retval
- brasl %r14,syscall_trace
- lg %r2,SP_R2(%r15)
- cghi %r2,-ENOSYS
- je trace_svc_go
- 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 trace_svc_noemu
- la %r2,4(%r2) # use 31 bit emulation system calls
- trace_svc_noemu:
- lgf %r8,0(%r2,%r7) # load address of system call routine
- trace_svc_go:
- 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
- lgr %r14,%r11 # return point is in %r11
- jg syscall_trace # 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
- larl %r14,sysc_return
- jg schedule_tail # return to 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
- 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)
- .long SYSCALL(sys_ni_syscall,sys_ni_syscall)
- .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* 224 - reserved for setxattr */
- .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* 225 - reserved for lsetxattr */
- .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* 226 - reserved for fsetxattr */
- .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* 227 - reserved for getxattr */
- .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* 228 - reserved for lgetxattr */
- .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* 229 - reserved for fgetxattr */
- .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* 230 - reserved for listxattr */
- .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* 231 - reserved for llistxattr */
- .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* 232 - reserved for flistxattr */
- .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* 233 - reserved for removexattr */
- .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* 234 - reserved for lremovexattr */
- .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* 235 - reserved for fremovexattr */
- .long SYSCALL(sys_gettid,sys_gettid)
- .long SYSCALL(sys_tkill,sys_tkill)
- .rept 255-237
- .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
- jnz pgm_per # got per exception -> special case
- SAVE_ALL __LC_PGM_OLD_PSW,1
- llgh %r8,__LC_PGM_INT_CODE
- sll %r8,3
- GET_CURRENT
- 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
- lgf %r3,__LC_PGM_ILC # load program interruption code
- 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
- lpswe __LC_PGM_OLD_PSW
- #
- # Normal per exception
- #
- pgm_per_std:
- SAVE_ALL __LC_PGM_OLD_PSW,1
- GET_CURRENT
- lghi %r4,0x7f
- lgf %r3,__LC_PGM_ILC # load program interruption code
- nr %r4,%r3 # clear per-event-bit and ilc
- je pgm_per_only # only per of per+check ?
- sll %r4,3
- larl %r1,pgm_check_table
- lg %r1,0(%r4,%r1) # load address of handler routine
- la %r2,SP_PTREGS(%r15) # address of register-save area
- basr %r14,%r1 # branch to interrupt-handler
- pgm_per_only:
- la %r2,SP_PTREGS(15) # address of register-save area
- larl %r14,sysc_return # load adr. of system return
- jg handle_per_exception
- #
- # it was a single stepped SVC that is causing all the trouble
- #
- pgm_svcper:
- SAVE_ALL __LC_SVC_OLD_PSW,1
- larl %r7,sys_call_table
- llgh %r8,__LC_SVC_INT_CODE # get svc number from lowcore
- sll %r8,3
- GET_CURRENT # load pointer to task_struct to R9
- stosm 48(%r15),0x03 # reenable interrupts
- tm SP_PSW+3(%r15),0x01 # are we running in 31 bit mode ?
- jo pgm_svcper_noemu
- la %r8,4(%r8) # use 31 bit emulation system calls
- pgm_svcper_noemu:
- lgf %r8,0(%r8,%r7) # load address of system call routine
- tm __TASK_ptrace+7(%r9),0x02 # PT_TRACESYS
- jnz pgm_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 !!
- pgm_svcret:
- icm %r0,15,__TASK_sigpending(%r9)
- jz pgm_svcper_nosig
- la %r2,SP_PTREGS(%r15) # load pt_regs
- sgr %r3,%r3 # clear *oldset
- brasl %r14,do_signal
-
- pgm_svcper_nosig:
- lhi %r0,__LC_PGM_OLD_PSW # set trap indication back to pgm_chk
- st %r0,SP_TRAP(%r15)
- la %r2,SP_PTREGS(15) # address of register-save area
- larl %r14,sysc_return # load adr. of system return
- jg handle_per_exception
- #
- # call trace before and after sys_call
- #
- pgm_tracesys:
- larl %r11,pgm_svcret
- j trace_svc
- /*
- * 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,__TASK_processor(%r9)
- 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,__TASK_need_resched(%r9)
- ltgr %r0,%r0
- jnz io_reschedule
- icm %r0,15,__TASK_sigpending(%r9)
- 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
- llgh %r6,__LC_EXT_INT_CODE # get interruption code
- lgr %r1,%r6 # calculate index = code & 0xff
- nill %r1,0xff
- sll %r1,3
- larl %r7,ext_int_hash
- lg %r7,0(%r1,%r7) # get first list entry for hash value
- ltgr %r7,%r7 # == NULL ?
- jz io_return # yes, nothing to do, exit
- ext_int_loop:
- ch %r6,16(%r7) # compare external interrupt code
- jne ext_int_next
- lg %r1,8(%r7) # get handler address
- la %r2,SP_PTREGS(%r15) # address of register-save area
- lgr %r3,%r6 # interruption code
- basr %r14,%r1 # call handler
- ext_int_next:
- lg %r7,0(%r7) # next list entry
- ltgr %r7,%r7
- jnz ext_int_loop
- j io_return
- /*
- * 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