2 * arch/s390/kernel/entry.S
3 * S390 low-level entry points.
6 * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
7 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
8 * Hartmut Penner (hp@de.ibm.com),
9 * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
12 #include <linux/sys.h>
13 #include <linux/linkage.h>
14 #include <linux/config.h>
15 #include <asm/cache.h>
16 #include <asm/lowcore.h>
17 #include <asm/errno.h>
19 #include <asm/ptrace.h>
23 * Stack layout for the system_call stack entry.
24 * The first few entries are identical to the user_regs_struct.
26 SP_PTREGS = STACK_FRAME_OVERHEAD
27 SP_PSW = STACK_FRAME_OVERHEAD + PT_PSWMASK
28 SP_R0 = STACK_FRAME_OVERHEAD + PT_GPR0
29 SP_R1 = STACK_FRAME_OVERHEAD + PT_GPR1
30 SP_R2 = STACK_FRAME_OVERHEAD + PT_GPR2
31 SP_R3 = STACK_FRAME_OVERHEAD + PT_GPR3
32 SP_R4 = STACK_FRAME_OVERHEAD + PT_GPR4
33 SP_R5 = STACK_FRAME_OVERHEAD + PT_GPR5
34 SP_R6 = STACK_FRAME_OVERHEAD + PT_GPR6
35 SP_R7 = STACK_FRAME_OVERHEAD + PT_GPR7
36 SP_R8 = STACK_FRAME_OVERHEAD + PT_GPR8
37 SP_R9 = STACK_FRAME_OVERHEAD + PT_GPR9
38 SP_R10 = STACK_FRAME_OVERHEAD + PT_GPR10
39 SP_R11 = STACK_FRAME_OVERHEAD + PT_GPR11
40 SP_R12 = STACK_FRAME_OVERHEAD + PT_GPR12
41 SP_R13 = STACK_FRAME_OVERHEAD + PT_GPR13
42 SP_R14 = STACK_FRAME_OVERHEAD + PT_GPR14
43 SP_R15 = STACK_FRAME_OVERHEAD + PT_GPR15
44 SP_AREGS = STACK_FRAME_OVERHEAD + PT_ACR0
45 SP_ORIG_R2 = STACK_FRAME_OVERHEAD + PT_ORIGGPR2
46 /* Now the additional entries */
47 SP_TRAP = (SP_ORIG_R2+GPR_SIZE)
48 #if CONFIG_REMOTE_DEBUG
49 SP_CRREGS = (SP_TRAP+4)
50 /* fpu registers are saved & restored by the gdb stub itself */
51 SP_FPC = (SP_CRREGS+(NUM_CRS*CR_SIZE))
52 SP_FPRS = (SP_FPC+FPC_SIZE+FPC_PAD_SIZE)
53 SP_PGM_OLD_ILC= (SP_FPRS+(NUM_FPRS*FPR_SIZE))
55 SP_PGM_OLD_ILC= (SP_TRAP+4)
57 SP_SIZE = (SP_PGM_OLD_ILC+4)
59 * these defines are offsets into the thread_struct
62 _TSS_FPRS = (_TSS_PTREGS+8)
63 _TSS_AR2 = (_TSS_FPRS+136)
64 _TSS_AR4 = (_TSS_AR2+4)
65 _TSS_KSP = (_TSS_AR4+4)
66 _TSS_USERSEG = (_TSS_KSP+8)
67 _TSS_PROT = (_TSS_USERSEG+8)
68 _TSS_ERROR = (_TSS_PROT+8)
69 _TSS_TRAP = (_TSS_ERROR+4)
70 _TSS_PER = (_TSS_TRAP+4)
71 _TSS_IEEE = (_TSS_PER+72)
72 _TSS_FLAGS = (_TSS_IEEE+8)
75 * these are offsets into the task-struct.
85 * Register usage in interrupt handlers:
86 * R9 - pointer to current task structure
87 * R13 - pointer to literal pool
88 * R14 - return register for function calls
89 * R15 - kernel stack pointer
92 .macro SAVE_ALL psworg # system entry macro
93 stmg %r14,%r15,__LC_SAVE_AREA
94 stam %a2,%a4,__LC_SAVE_AREA+16
95 tm \psworg+1,0x01 # test problem state bit
96 jz 0f # skip stack setup save
97 lg %r15,__LC_KERNEL_STACK # problem state -> load ksp
99 sar %a2,%r14 # set ac.reg. 2 to primary space
101 sar %a4,%r14 # set access reg. 4 to home space
102 0: aghi %r15,-SP_SIZE # make room for registers & psw
103 nill %r15,0xfff8 # align stack pointer to 8
104 stmg %r0,%r14,SP_R0(%r15) # store gprs 0-14 to kernel stack
105 stg %r2,SP_ORIG_R2(%r15) # store original content of gpr 2
106 mvc SP_R14(16,%r15),__LC_SAVE_AREA # move R15 to stack
107 stam %a0,%a15,SP_AREGS(%r15) # store access registers to kst.
108 mvc SP_AREGS+8(12,%r15),__LC_SAVE_AREA+16 # store ac. regs
109 mvc SP_PSW(16,%r15),\psworg # move user PSW to stack
110 lhi %r0,\psworg # store trap indication
112 xc 0(8,%r15),0(%r15) # clear back chain
115 .macro RESTORE_ALL # system exit macro
116 mvc __LC_RETURN_PSW(16),SP_PSW(%r15) # move user PSW to lowcore
117 lam %a0,%a15,SP_AREGS(%r15) # load the access registers
118 lmg %r0,%r15,SP_R0(%r15) # load gprs 0-15 of user
119 ni __LC_RETURN_PSW+1,0xfd # clear wait state bit
120 lpswe __LC_RETURN_PSW # back to caller
124 lghi %r9,-16384 # load pointer to task_struct to %r9
130 * Scheduler resume function, called by switch_to
131 * grp2 = (thread_struct *) prev->tss
132 * grp3 = (thread_struct *) next->tss
138 lg %r4,_TSS_PTREGS(%r3)
139 tm SP_PSW-SP_PTREGS(%r4),0x40 # is the new process using per ?
140 jz resume_noper # if not we're fine
141 stctg %c9,%c11,48(%r15) # We are using per stuff
142 clc _TSS_PER(24,%r3),48(%r15)
143 je resume_noper # we got away without bashing TLB's
144 lctlg %c9,%c11,_TSS_PER(%r3) # Nope we didn't
146 stmg %r6,%r15,48(%r15) # store resume registers of prev task
147 stg %r15,_TSS_KSP(%r2) # store kernel stack ptr to prev->tss.ksp
150 lg %r15,_TSS_KSP(%r3) # load kernel stack ptr from next->tss.ksp
154 stg %r1,__LC_KERNEL_STACK # __LC_KERNEL_STACK = new kernel stack
155 stam %a2,%a2,_TSS_AR2(%r2) # store kernel access reg. 2
156 stam %a4,%a4,_TSS_AR4(%r2) # store kernel access reg. 4
157 lam %a2,%a2,_TSS_AR2(%r3) # load kernel access reg. 2
158 lam %a4,%a4,_TSS_AR4(%r3) # load kernel access reg. 4
159 lgr %r2,%r0 # return task_struct of last task
160 lmg %r6,%r15,48(%r15) # load resume registers of next task
164 * SVC interrupt handler routine. System calls are synchronous events and
165 * are executed with interrupts enabled.
170 SAVE_ALL __LC_SVC_OLD_PSW
171 mvi SP_PGM_OLD_ILC(%r15),1 # mark PGM_OLD_ILC as invalid
173 GET_CURRENT # load pointer to task_struct to R9
174 larl %r7,sys_call_table
175 llgc %r8,__LC_SVC_INT_CODE+1 # get svc number from lowcore
176 stosm 48(%r15),0x03 # reenable interrupts
178 tm SP_PSW+3(%r15),0x01 # are we running in 31 bit mode ?
180 la %r8,4(%r8) # use 31 bit emulation system calls
182 lgf %r8,0(%r8,%r7) # load address of system call routine
183 tm tsk_ptrace+7(%r9),0x02 # PT_TRACESYS
185 basr %r14,%r8 # call sys_xxxx
186 stg %r2,SP_R2(%r15) # store return value (change R2 on stack)
187 # ATTENTION: check sys_execve_glue before
188 # changing anything here !!
191 tm SP_PSW+1(%r15),0x01 # returning to user ?
192 jno sysc_leave # no-> skip bottom half, resched & signal
194 # check, if reschedule is needed
196 lg %r0,need_resched(%r9) # get need_resched from task_struct
199 icm %r0,15,sigpending(%r9) # get sigpending from task_struct
200 jnz sysc_signal_return
202 tm SP_PGM_OLD_ILC(%r15),0xff
204 stnsm 48(%r15),0xfc # disable I/O and ext. interrupts
208 # call do_signal before return
211 la %r2,SP_PTREGS(%r15) # load pt_regs
212 sgr %r3,%r3 # clear *oldset
214 jg do_signal # return point is sysc_leave
217 # call trace before and after sys_call
221 stg %r2,SP_R2(%r15) # give sysc_trace an -ENOSYS retval
222 brasl %r14,syscall_trace
223 lmg %r3,%r6,SP_R3(%r15)
224 lg %r2,SP_ORIG_R2(%r15)
225 basr %r14,%r8 # call sys_xxx
226 stg %r2,SP_R2(%r15) # store return value
227 larl %r14,sysc_return
228 jg syscall_trace # return point is sysc_return
231 # call schedule with sysc_return as return-address
234 larl %r14,sysc_return
235 jg schedule # return point is sysc_return
238 # a new process exits the kernel with ret_from_fork
242 GET_CURRENT # load pointer to task_struct to R9
243 stosm 48(%r15),0x03 # reenable interrupts
244 xc SP_R2(8,%r15),SP_R2(%r15) # child returns 0
246 larl %r14,sysc_return
247 jg schedule_tail # return to sysc_return
253 # clone, fork, vfork, exec and sigreturn need glue,
254 # because they all expect pt_regs as parameter,
255 # but are called with different parameter.
256 # return-address is set up above
259 la %r2,SP_PTREGS(%r15) # load pt_regs
260 jg sys_clone # branch to sys_clone
263 la %r2,SP_PTREGS(%r15) # load pt_regs
264 jg sys_fork # branch to sys_fork
267 la %r2,SP_PTREGS(%r15) # load pt_regs
268 jg sys_vfork # branch to sys_vfork
271 la %r2,SP_PTREGS(%r15) # load pt_regs
272 lgr %r12,%r14 # save return address
273 brasl %r14,sys_execve # call sys_execve
274 ltgr %r2,%r2 # check if execve failed
275 bnz 0(%r12) # it did fail -> store result in gpr2
276 b 6(%r12) # SKIP STG 2,SP_R2(15) in
277 # system_call/sysc_tracesys
278 #ifdef CONFIG_S390_SUPPORT
280 la %r2,SP_PTREGS(%r15) # load pt_regs
281 lgr %r12,%r14 # save return address
282 brasl %r14,sys32_execve # call sys32_execve
283 ltgr %r2,%r2 # check if execve failed
284 bnz 0(%r12) # it did fail -> store result in gpr2
285 b 6(%r12) # SKIP STG 2,SP_R2(15) in
286 # system_call/sysc_tracesys
290 la %r2,SP_PTREGS(%r15) # load pt_regs as parameter
291 jg sys_sigreturn # branch to sys_sigreturn
293 #ifdef CONFIG_S390_SUPPORT
294 sys32_sigreturn_glue:
295 la %r2,SP_PTREGS(%r15) # load pt_regs as parameter
296 jg sys32_sigreturn # branch to sys32_sigreturn
299 sys_rt_sigreturn_glue:
300 la %r2,SP_PTREGS(%r15) # load pt_regs as parameter
301 jg sys_rt_sigreturn # branch to sys_sigreturn
303 #ifdef CONFIG_S390_SUPPORT
304 sys32_rt_sigreturn_glue:
305 la %r2,SP_PTREGS(%r15) # load pt_regs as parameter
306 jg sys32_rt_sigreturn # branch to sys32_sigreturn
310 # sigsuspend and rt_sigsuspend need pt_regs as an additional
311 # parameter and they have to skip the store of %r2 into the
312 # user register %r2 because the return value was set in
313 # sigsuspend and rt_sigsuspend already and must not be overwritten!
317 lgr %r5,%r4 # move mask back
318 lgr %r4,%r3 # move history1 parameter
319 lgr %r3,%r2 # move history0 parameter
320 la %r2,SP_PTREGS(%r15) # load pt_regs as first parameter
321 la %r14,6(%r14) # skip store of return value
322 jg sys_sigsuspend # branch to sys_sigsuspend
324 #ifdef CONFIG_S390_SUPPORT
325 sys32_sigsuspend_glue:
326 llgfr %r4,%r4 # unsigned long
327 lgr %r5,%r4 # move mask back
329 lgr %r4,%r3 # move history1 parameter
331 lgr %r3,%r2 # move history0 parameter
332 la %r2,SP_PTREGS(%r15) # load pt_regs as first parameter
333 la %r14,6(%r14) # skip store of return value
334 jg sys32_sigsuspend # branch to sys32_sigsuspend
337 sys_rt_sigsuspend_glue:
338 lgr %r4,%r3 # move sigsetsize parameter
339 lgr %r3,%r2 # move unewset parameter
340 la %r2,SP_PTREGS(%r15) # load pt_regs as first parameter
341 la %r14,6(%r14) # skip store of return value
342 jg sys_rt_sigsuspend # branch to sys_rt_sigsuspend
344 #ifdef CONFIG_S390_SUPPORT
345 sys32_rt_sigsuspend_glue:
346 llgfr %r3,%r3 # size_t
347 lgr %r4,%r3 # move sigsetsize parameter
348 llgtr %r2,%r2 # sigset_emu31_t *
349 lgr %r3,%r2 # move unewset parameter
350 la %r2,SP_PTREGS(%r15) # load pt_regs as first parameter
351 la %r14,6(%r14) # skip store of return value
352 jg sys32_rt_sigsuspend # branch to sys32_rt_sigsuspend
355 sys_sigaltstack_glue:
356 la %r4,SP_PTREGS(%r15) # load pt_regs as parameter
357 jg sys_sigaltstack # branch to sys_sigreturn
359 #ifdef CONFIG_S390_SUPPORT
360 sys32_sigaltstack_glue:
361 la %r4,SP_PTREGS(%r15) # load pt_regs as parameter
362 jg sys32_sigaltstack_wrapper # branch to sys_sigreturn
365 #ifdef CONFIG_S390_SUPPORT
366 #define SYSCALL(esame,esa) esame,esa
368 #define SYSCALL(esame,esa) esame,sys_ni_syscall
371 .globl sys_call_table
373 .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* 0 */
374 .long SYSCALL(sys_exit,sys32_exit_wrapper)
375 .long SYSCALL(sys_fork_glue,sys_fork_glue)
376 .long SYSCALL(sys_read,sys32_read_wrapper)
377 .long SYSCALL(sys_write,sys32_write_wrapper)
378 .long SYSCALL(sys_open,sys32_open_wrapper) /* 5 */
379 .long SYSCALL(sys_close,sys32_close_wrapper)
380 .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* old waitpid syscall */
381 .long SYSCALL(sys_creat,sys32_creat_wrapper)
382 .long SYSCALL(sys_link,sys32_link_wrapper)
383 .long SYSCALL(sys_unlink,sys32_unlink_wrapper) /* 10 */
384 .long SYSCALL(sys_execve_glue,sys32_execve_glue)
385 .long SYSCALL(sys_chdir,sys32_chdir_wrapper)
386 .long SYSCALL(sys_ni_syscall,sys32_time_wrapper) /* old time syscall */
387 .long SYSCALL(sys_mknod,sys32_mknod_wrapper)
388 .long SYSCALL(sys_chmod,sys32_chmod_wrapper) /* 15 */
389 .long SYSCALL(sys_ni_syscall,sys32_lchown16_wrapper) /* old lchown16 syscall*/
390 .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* old break syscall */
391 .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* old stat syscall */
392 .long SYSCALL(sys_lseek,sys32_lseek_wrapper)
393 .long SYSCALL(sys_getpid,sys_getpid) /* 20 */
394 .long SYSCALL(sys_mount,sys32_mount_wrapper)
395 .long SYSCALL(sys_oldumount,sys32_oldumount_wrapper)
396 .long SYSCALL(sys_ni_syscall,sys32_setuid16_wrapper) /* old setuid16 syscall*/
397 .long SYSCALL(sys_ni_syscall,sys32_getuid16) /* old getuid16 syscall*/
398 .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* 25 old stime syscall */
399 .long SYSCALL(sys_ptrace,sys32_ptrace_wrapper)
400 .long SYSCALL(sys_alarm,sys32_alarm_wrapper)
401 .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* old fstat syscall */
402 .long SYSCALL(sys_pause,sys32_pause)
403 .long SYSCALL(sys_utime,sys32_utime_wrapper) /* 30 */
404 .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* old stty syscall */
405 .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* old gtty syscall */
406 .long SYSCALL(sys_access,sys32_access_wrapper)
407 .long SYSCALL(sys_nice,sys32_nice_wrapper)
408 .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* old ftime syscall */
409 .long SYSCALL(sys_sync,sys_sync)
410 .long SYSCALL(sys_kill,sys32_kill_wrapper)
411 .long SYSCALL(sys_rename,sys32_rename_wrapper)
412 .long SYSCALL(sys_mkdir,sys32_mkdir_wrapper)
413 .long SYSCALL(sys_rmdir,sys32_rmdir_wrapper) /* 40 */
414 .long SYSCALL(sys_dup,sys32_dup_wrapper)
415 .long SYSCALL(sys_pipe,sys32_pipe_wrapper)
416 .long SYSCALL(sys_times,sys32_times_wrapper)
417 .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* old prof syscall */
418 .long SYSCALL(sys_brk,sys32_brk_wrapper) /* 45 */
419 .long SYSCALL(sys_ni_syscall,sys32_setgid16) /* old setgid16 syscall*/
420 .long SYSCALL(sys_ni_syscall,sys32_getgid16) /* old getgid16 syscall*/
421 .long SYSCALL(sys_signal,sys32_signal_wrapper)
422 .long SYSCALL(sys_ni_syscall,sys32_geteuid16) /* old geteuid16 syscall */
423 .long SYSCALL(sys_ni_syscall,sys32_getegid16) /* old getegid16 syscall */
424 .long SYSCALL(sys_acct,sys32_acct_wrapper)
425 .long SYSCALL(sys_umount,sys32_umount_wrapper)
426 .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* old lock syscall */
427 .long SYSCALL(sys_ioctl,sys32_ioctl_wrapper)
428 .long SYSCALL(sys_fcntl,sys32_fcntl_wrapper) /* 55 */
429 .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* intel mpx syscall */
430 .long SYSCALL(sys_setpgid,sys32_setpgid_wrapper)
431 .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* old ulimit syscall */
432 .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* old uname syscall */
433 .long SYSCALL(sys_umask,sys32_umask_wrapper) /* 60 */
434 .long SYSCALL(sys_chroot,sys32_chroot_wrapper)
435 .long SYSCALL(sys_ustat,sys32_ustat_wrapper)
436 .long SYSCALL(sys_dup2,sys32_dup2_wrapper)
437 .long SYSCALL(sys_getppid,sys_getppid)
438 .long SYSCALL(sys_getpgrp,sys_getpgrp) /* 65 */
439 .long SYSCALL(sys_setsid,sys_setsid)
440 .long SYSCALL(sys_sigaction,sys32_sigaction_wrapper)
441 .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* old sgetmask syscall*/
442 .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* old ssetmask syscall*/
443 .long SYSCALL(sys_ni_syscall,sys32_setreuid16_wrapper) /* old setreuid16 syscall */
444 .long SYSCALL(sys_ni_syscall,sys32_setregid16_wrapper) /* old setregid16 syscall */
445 .long SYSCALL(sys_sigsuspend_glue,sys32_sigsuspend_glue)
446 .long SYSCALL(sys_sigpending,sys32_sigpending_wrapper)
447 .long SYSCALL(sys_sethostname,sys32_sethostname_wrapper)
448 .long SYSCALL(sys_setrlimit,sys32_setrlimit_wrapper) /* 75 */
449 .long SYSCALL(sys_getrlimit,sys32_old_getrlimit_wrapper)
450 .long SYSCALL(sys_getrusage,sys32_getrusage_wrapper)
451 .long SYSCALL(sys_gettimeofday,sys32_gettimeofday_wrapper)
452 .long SYSCALL(sys_settimeofday,sys32_settimeofday_wrapper)
453 .long SYSCALL(sys_ni_syscall,sys32_getgroups16_wrapper) /* old getgroups16 syscall */
454 .long SYSCALL(sys_ni_syscall,sys32_setgroups16_wrapper) /* old setgroups16 syscall */
455 .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* old select syscall */
456 .long SYSCALL(sys_symlink,sys32_symlink_wrapper)
457 .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* old lstat syscall */
458 .long SYSCALL(sys_readlink,sys32_readlink_wrapper) /* 85 */
459 .long SYSCALL(sys_uselib,sys32_uselib_wrapper)
460 .long SYSCALL(sys_swapon,sys32_swapon_wrapper)
461 .long SYSCALL(sys_reboot,sys32_reboot_wrapper)
462 .long SYSCALL(sys_ni_syscall,old32_readdir_wrapper) /* old readdir syscall */
463 .long SYSCALL(old_mmap,old32_mmap_wrapper) /* 90 */
464 .long SYSCALL(sys_munmap,sys32_munmap_wrapper)
465 .long SYSCALL(sys_truncate,sys32_truncate_wrapper)
466 .long SYSCALL(sys_ftruncate,sys32_ftruncate_wrapper)
467 .long SYSCALL(sys_fchmod,sys32_fchmod_wrapper)
468 .long SYSCALL(sys_ni_syscall,sys32_fchown16_wrapper) /* old fchown16 syscall*/
469 .long SYSCALL(sys_getpriority,sys32_getpriority_wrapper)
470 .long SYSCALL(sys_setpriority,sys32_setpriority_wrapper)
471 .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* old profil syscall */
472 .long SYSCALL(sys_statfs,sys32_statfs_wrapper)
473 .long SYSCALL(sys_fstatfs,sys32_fstatfs_wrapper) /* 100 */
474 .long SYSCALL(sys_ni_syscall,sys_ni_syscall)
475 .long SYSCALL(sys_socketcall,sys32_socketcall_wrapper)
476 .long SYSCALL(sys_syslog,sys32_syslog_wrapper)
477 .long SYSCALL(sys_setitimer,sys32_setitimer_wrapper)
478 .long SYSCALL(sys_getitimer,sys32_getitimer_wrapper) /* 105 */
479 .long SYSCALL(sys_newstat,sys32_newstat_wrapper)
480 .long SYSCALL(sys_newlstat,sys32_newlstat_wrapper)
481 .long SYSCALL(sys_newfstat,sys32_newfstat_wrapper)
482 .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* old uname syscall */
483 .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* iopl for i386 */
484 .long SYSCALL(sys_vhangup,sys_vhangup)
485 .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* old "idle" system call */
486 .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* vm86old for i386 */
487 .long SYSCALL(sys_wait4,sys32_wait4_wrapper)
488 .long SYSCALL(sys_swapoff,sys32_swapoff_wrapper) /* 115 */
489 .long SYSCALL(sys_sysinfo,sys32_sysinfo_wrapper)
490 .long SYSCALL(sys_ipc,sys32_ipc_wrapper)
491 .long SYSCALL(sys_fsync,sys32_fsync_wrapper)
492 .long SYSCALL(sys_sigreturn_glue,sys32_sigreturn_glue)
493 .long SYSCALL(sys_clone_glue,sys_clone_glue) /* 120 */
494 .long SYSCALL(sys_setdomainname,sys32_setdomainname_wrapper)
495 .long SYSCALL(sys_newuname,sys32_newuname_wrapper)
496 .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* modify_ldt for i386 */
497 .long SYSCALL(sys_adjtimex,sys32_adjtimex_wrapper)
498 .long SYSCALL(sys_mprotect,sys32_mprotect_wrapper) /* 125 */
499 .long SYSCALL(sys_sigprocmask,sys32_sigprocmask_wrapper)
500 .long SYSCALL(sys_create_module,sys32_create_module_wrapper)
501 .long SYSCALL(sys_init_module,sys32_init_module_wrapper)
502 .long SYSCALL(sys_delete_module,sys32_delete_module_wrapper)
503 .long SYSCALL(sys_get_kernel_syms,sys32_get_kernel_syms_wrapper) /* 130 */
504 .long SYSCALL(sys_quotactl,sys32_quotactl_wrapper)
505 .long SYSCALL(sys_getpgid,sys32_getpgid_wrapper)
506 .long SYSCALL(sys_fchdir,sys32_fchdir_wrapper)
507 .long SYSCALL(sys_bdflush,sys32_bdflush_wrapper)
508 .long SYSCALL(sys_sysfs,sys32_sysfs_wrapper) /* 135 */
509 .long SYSCALL(sys_personality,sys32_personality_wrapper)
510 .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* for afs_syscall */
511 .long SYSCALL(sys_ni_syscall,sys32_setfsuid16_wrapper) /* old setfsuid16 syscall */
512 .long SYSCALL(sys_ni_syscall,sys32_setfsgid16_wrapper) /* old setfsgid16 syscall */
513 .long SYSCALL(sys_llseek,sys32_llseek_wrapper) /* 140 */
514 .long SYSCALL(sys_getdents,sys32_getdents_wrapper)
515 .long SYSCALL(sys_select,sys32_select_wrapper)
516 .long SYSCALL(sys_flock,sys32_flock_wrapper)
517 .long SYSCALL(sys_msync,sys32_msync_wrapper)
518 .long SYSCALL(sys_readv,sys32_readv_wrapper) /* 145 */
519 .long SYSCALL(sys_writev,sys32_writev_wrapper)
520 .long SYSCALL(sys_getsid,sys32_getsid_wrapper)
521 .long SYSCALL(sys_fdatasync,sys32_fdatasync_wrapper)
522 .long SYSCALL(sys_sysctl,sys_ni_syscall)
523 .long SYSCALL(sys_mlock,sys32_mlock_wrapper) /* 150 */
524 .long SYSCALL(sys_munlock,sys32_munlock_wrapper)
525 .long SYSCALL(sys_mlockall,sys32_mlockall_wrapper)
526 .long SYSCALL(sys_munlockall,sys_munlockall)
527 .long SYSCALL(sys_sched_setparam,sys32_sched_setparam_wrapper)
528 .long SYSCALL(sys_sched_getparam,sys32_sched_getparam_wrapper) /* 155 */
529 .long SYSCALL(sys_sched_setscheduler,sys32_sched_setscheduler_wrapper)
530 .long SYSCALL(sys_sched_getscheduler,sys32_sched_getscheduler_wrapper)
531 .long SYSCALL(sys_sched_yield,sys_sched_yield)
532 .long SYSCALL(sys_sched_get_priority_max,sys32_sched_get_priority_max_wrapper)
533 .long SYSCALL(sys_sched_get_priority_min,sys32_sched_get_priority_min_wrapper)
534 .long SYSCALL(sys_sched_rr_get_interval,sys32_sched_rr_get_interval_wrapper)
535 .long SYSCALL(sys_nanosleep,sys32_nanosleep_wrapper)
536 .long SYSCALL(sys_mremap,sys32_mremap_wrapper)
537 .long SYSCALL(sys_ni_syscall,sys32_setresuid16_wrapper) /* old setresuid16 syscall */
538 .long SYSCALL(sys_ni_syscall,sys32_getresuid16_wrapper) /* old getresuid16 syscall */
539 .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* for vm86 */
540 .long SYSCALL(sys_query_module,sys32_query_module_wrapper)
541 .long SYSCALL(sys_poll,sys32_poll_wrapper)
542 .long SYSCALL(sys_nfsservctl,sys32_nfsservctl_wrapper)
543 .long SYSCALL(sys_ni_syscall,sys32_setresgid16_wrapper) /* old setresgid16 syscall */
544 .long SYSCALL(sys_ni_syscall,sys32_getresgid16_wrapper) /* old getresgid16 syscall */
545 .long SYSCALL(sys_prctl,sys32_prctl_wrapper)
546 .long SYSCALL(sys_rt_sigreturn_glue,sys32_rt_sigreturn_glue)
547 .long SYSCALL(sys_rt_sigaction,sys32_rt_sigaction_wrapper)
548 .long SYSCALL(sys_rt_sigprocmask,sys32_rt_sigprocmask_wrapper) /* 175 */
549 .long SYSCALL(sys_rt_sigpending,sys32_rt_sigpending_wrapper)
550 .long SYSCALL(sys_rt_sigtimedwait,sys32_rt_sigtimedwait_wrapper)
551 .long SYSCALL(sys_rt_sigqueueinfo,sys32_rt_sigqueueinfo_wrapper)
552 .long SYSCALL(sys_rt_sigsuspend_glue,sys32_rt_sigsuspend_glue)
553 .long SYSCALL(sys_pread,sys32_pread_wrapper) /* 180 */
554 .long SYSCALL(sys_pwrite,sys32_pwrite_wrapper)
555 .long SYSCALL(sys_ni_syscall,sys32_chown16_wrapper) /* old chown16 syscall */
556 .long SYSCALL(sys_getcwd,sys32_getcwd_wrapper)
557 .long SYSCALL(sys_capget,sys32_capget_wrapper)
558 .long SYSCALL(sys_capset,sys32_capset_wrapper) /* 185 */
559 .long SYSCALL(sys_sigaltstack_glue,sys32_sigaltstack_glue)
560 .long SYSCALL(sys_sendfile,sys32_sendfile_wrapper)
561 .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* streams1 */
562 .long SYSCALL(sys_ni_syscall,sys_ni_syscall) /* streams2 */
563 .long SYSCALL(sys_vfork_glue,sys_vfork_glue) /* 190 */
564 .long SYSCALL(sys_getrlimit,sys32_old_getrlimit_wrapper)
565 .long SYSCALL(sys_mmap2,sys32_mmap2_wrapper)
566 .long SYSCALL(sys_ni_syscall,sys32_truncate64_wrapper)
567 .long SYSCALL(sys_ni_syscall,sys32_ftruncate64_wrapper)
568 .long SYSCALL(sys_ni_syscall,sys32_stat64) /* 195 */
569 .long SYSCALL(sys_ni_syscall,sys32_lstat64)
570 .long SYSCALL(sys_ni_syscall,sys32_fstat64)
571 .long SYSCALL(sys_lchown,sys32_lchown_wrapper)
572 .long SYSCALL(sys_getuid,sys_getuid)
573 .long SYSCALL(sys_getgid,sys_getgid) /* 200 */
574 .long SYSCALL(sys_geteuid,sys_geteuid)
575 .long SYSCALL(sys_getegid,sys_getegid)
576 .long SYSCALL(sys_setreuid,sys32_setreuid_wrapper)
577 .long SYSCALL(sys_setregid,sys32_setregid_wrapper)
578 .long SYSCALL(sys_getgroups,sys32_getgroups_wrapper) /* 205 */
579 .long SYSCALL(sys_setgroups,sys32_setgroups_wrapper)
580 .long SYSCALL(sys_fchown,sys32_fchown_wrapper)
581 .long SYSCALL(sys_setresuid,sys32_setresuid_wrapper)
582 .long SYSCALL(sys_getresuid,sys32_getresuid_wrapper)
583 .long SYSCALL(sys_setresgid,sys32_setresgid_wrapper) /* 210 */
584 .long SYSCALL(sys_getresgid,sys32_getresgid_wrapper)
585 .long SYSCALL(sys_chown,sys32_chown_wrapper)
586 .long SYSCALL(sys_setuid,sys32_setuid_wrapper)
587 .long SYSCALL(sys_setgid,sys32_setgid_wrapper)
588 .long SYSCALL(sys_setfsuid,sys32_setfsuid_wrapper) /* 215 */
589 .long SYSCALL(sys_setfsgid,sys32_setfsgid_wrapper)
590 .long SYSCALL(sys_pivot_root,sys32_pivot_root_wrapper)
591 .long SYSCALL(sys_mincore,sys32_mincore_wrapper)
592 .long SYSCALL(sys_madvise,sys32_madvise_wrapper)
593 .long SYSCALL(sys_getdents64,sys32_getdents64_wrapper)/* 220 */
594 .long SYSCALL(sys_ni_syscall,sys32_fcntl64_wrapper)
596 .long SYSCALL(sys_ni_syscall,sys_ni_syscall)
600 * Program check handler routine
603 .globl pgm_check_handler
606 * First we need to check for a special case:
607 * Single stepping an instruction that disables the PER event mask will
608 * cause a PER event AFTER the mask has been set. Example: SVC or LPSW.
609 * For a single stepped SVC the program check handler gets control after
610 * the SVC new PSW has been loaded. But we want to execute the SVC first and
611 * then handle the PER event. Therefore we update the SVC old PSW to point
612 * to the pgm_check_handler and branch to the SVC handler after we checked
613 * if we have to load the kernel stack register.
614 * For every other possible cause for PER event without the PER mask set
615 * we just ignore the PER event (FIXME: is there anything we have to do
618 tm __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception
619 jz pgm_sv # skip if not
620 tm __LC_PGM_OLD_PSW,0x40 # test if per event recording is on
621 jnz pgm_sv # skip if it is
622 # ok its one of the special cases, now we need to find out which one
623 clc __LC_PGM_OLD_PSW(16),__LC_SVC_NEW_PSW
625 # no interesting special case, ignore PER event
626 lpswe __LC_PGM_OLD_PSW
627 # it was a single stepped SVC that is causing all the trouble
629 SAVE_ALL __LC_SVC_OLD_PSW
630 mvc SP_PGM_OLD_ILC(4,%r15),__LC_PGM_ILC # save program check information
631 j pgm_system_call # now do the svc
633 lhi %r0,__LC_PGM_OLD_PSW # set trap indication back to pgm_chk
635 llgh %r7,SP_PGM_OLD_ILC(%r15) # get ilc from stack
636 mvi SP_PGM_OLD_ILC(%r15),1 # mark PGM_OLD_ILC as invalid
639 SAVE_ALL __LC_PGM_OLD_PSW
640 mvi SP_PGM_OLD_ILC(%r15),1 # mark PGM_OLD_ILC as invalid
641 llgh %r7,__LC_PGM_ILC # load instruction length
644 llgh %r8,__LC_PGM_INT_CODE # N.B. saved int code used later KEEP it
645 stosm 48(%r15),0x03 # reenable interrupts
647 nr %r3,%r8 # clear per-event-bit & move to r3
648 je pgm_dn # none of Martins exceptions occurred bypass
650 larl %r1,pgm_check_table
651 lg %r1,0(%r3,%r1) # load address of handler routine
653 la %r2,SP_PTREGS(%r15) # address of register-save area
654 chi %r3,0x4 # protection-exception ?
656 lg %r5,SP_PSW+8(15) # load psw addr
657 slgr %r5,%r7 # substract ilc from psw
658 stg %r5,SP_PSW+8(15) # store corrected psw addr
659 pgm_go: basr %r14,%r1 # branch to interrupt-handler
660 pgm_dn: nill %r8,0x80 # check for per exception
662 la %r2,SP_PTREGS(15) # address of register-save area
663 larl %r14,sysc_return # load adr. of system return
664 jg handle_per_exception
667 * IO interrupt handler routine
669 .globl io_int_handler
671 SAVE_ALL __LC_IO_OLD_PSW
672 GET_CURRENT # load pointer to task_struct to R9
673 la %r2,SP_PTREGS(%r15) # address of register-save area
674 llgh %r3,__LC_SUBCHANNEL_NR # load subchannel number
675 llgf %r4,__LC_IO_INT_PARM # load interuption parm
676 llgf %r5,__LC_IO_INT_WORD # load interuption word
677 brasl %r14,do_IRQ # call standard irq handler
681 # check, if bottom-half has to be done
683 lgf %r1,processor(%r9) # get cpu number from task struture
685 sll %r1,L1_CACHE_SHIFT
687 icm %r0,15,0(%r1) # test irq_stat[#cpu].__softirq_pending
688 jnz io_handle_bottom_half
691 tm SP_PSW+1(%r15),0x01 # returning to user ?
692 jno io_leave # no-> skip resched & signal
693 stosm 48(%r15),0x03 # reenable interrupts
695 # check, if reschedule is needed
697 lg %r0,need_resched(%r9) # get need_resched from task_struct
700 icm %r0,15,sigpending(%r9) # get sigpending from task_struct
703 stnsm 48(%r15),0xfc # disable I/O and ext. interrupts
707 # call do_softirq and return from syscall, if interrupt-level
710 io_handle_bottom_half:
711 larl %r14,io_return_bh
712 jg do_softirq # return point is io_return_bh
715 # call schedule with io_return as return-address
719 jg schedule # call scheduler, return to io_return
722 # call do_signal before return
725 la %r2,SP_PTREGS(%r15) # load pt_regs
726 slgr %r3,%r3 # clear *oldset
728 jg do_signal # return point is io_leave
731 * External interrupt handler routine
733 .globl ext_int_handler
735 SAVE_ALL __LC_EXT_OLD_PSW
736 GET_CURRENT # load pointer to task_struct to R9
737 la %r2,SP_PTREGS(%r15) # address of register-save area
738 llgh %r3,__LC_EXT_INT_CODE # error code
739 lgr %r1,%r3 # calculate index = code & 0xff
742 larl %r4,ext_int_hash
743 lg %r4,0(%r1,%r4) # get first list entry for hash value
744 ltgr %r4,%r4 # == NULL ?
745 jz io_return # yes, nothing to do, exit
747 ch %r3,16(%r4) # compare external interrupt code
749 lg %r4,0(%r4) # next list entry
754 lg %r4,8(%r4) # get handler address
756 br %r4 # branch to ext call handler
759 * Machine check handler routines
761 .globl mcck_int_handler
763 SAVE_ALL __LC_MCK_OLD_PSW
764 brasl %r14,s390_do_machine_check
770 * Restart interruption handler, kick starter for additional CPUs
772 .globl restart_int_handler
774 lg %r15,__LC_KERNEL_STACK # load ksp
775 lhi %r10,__LC_CREGS_SAVE_AREA
776 lctlg %c0,%c15,0(%r10) # get new ctl regs
777 lhi %r10,__LC_AREGS_SAVE_AREA
779 stosm 0(%r15),0x04 # now we can turn dat on
780 lmg %r6,%r15,48(%r15) # load registers from clone
784 * If we do not run with SMP enabled, let the new CPU crash ...
786 .globl restart_int_handler
790 lpswe restart_crash-restart_base(%r1)
793 .long 0x000a0000,0x00000000,0x00000000,0x00000000