/*
* 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>
/*
* 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
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
stosm 48(%r15),0x03 # reenable interrupts
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
