1/* 2 * S390 low-level entry points. 3 * 4 * Copyright IBM Corp. 1999, 2012 5 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), 6 * Hartmut Penner (hp@de.ibm.com), 7 * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com), 8 * Heiko Carstens <heiko.carstens@de.ibm.com> 9 */ 10 11#include <linux/init.h> 12#include <linux/linkage.h> 13#include <asm/processor.h> 14#include <asm/cache.h> 15#include <asm/errno.h> 16#include <asm/ptrace.h> 17#include <asm/thread_info.h> 18#include <asm/asm-offsets.h> 19#include <asm/unistd.h> 20#include <asm/page.h> 21#include <asm/sigp.h> 22#include <asm/irq.h> 23 24__PT_R0 = __PT_GPRS 25__PT_R1 = __PT_GPRS + 8 26__PT_R2 = __PT_GPRS + 16 27__PT_R3 = __PT_GPRS + 24 28__PT_R4 = __PT_GPRS + 32 29__PT_R5 = __PT_GPRS + 40 30__PT_R6 = __PT_GPRS + 48 31__PT_R7 = __PT_GPRS + 56 32__PT_R8 = __PT_GPRS + 64 33__PT_R9 = __PT_GPRS + 72 34__PT_R10 = __PT_GPRS + 80 35__PT_R11 = __PT_GPRS + 88 36__PT_R12 = __PT_GPRS + 96 37__PT_R13 = __PT_GPRS + 104 38__PT_R14 = __PT_GPRS + 112 39__PT_R15 = __PT_GPRS + 120 40 41STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER 42STACK_SIZE = 1 << STACK_SHIFT 43STACK_INIT = STACK_SIZE - STACK_FRAME_OVERHEAD - __PT_SIZE 44 45_TIF_WORK = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ 46 _TIF_UPROBE) 47_TIF_TRACE = (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \ 48 _TIF_SYSCALL_TRACEPOINT) 49_CIF_WORK = (_CIF_MCCK_PENDING | _CIF_ASCE) 50_PIF_WORK = (_PIF_PER_TRAP) 51 52#define BASED(name) name-system_call(%r13) 53 54 .macro TRACE_IRQS_ON 55#ifdef CONFIG_TRACE_IRQFLAGS 56 basr %r2,%r0 57 brasl %r14,trace_hardirqs_on_caller 58#endif 59 .endm 60 61 .macro TRACE_IRQS_OFF 62#ifdef CONFIG_TRACE_IRQFLAGS 63 basr %r2,%r0 64 brasl %r14,trace_hardirqs_off_caller 65#endif 66 .endm 67 68 .macro LOCKDEP_SYS_EXIT 69#ifdef CONFIG_LOCKDEP 70 tm __PT_PSW+1(%r11),0x01 # returning to user ? 71 jz .+10 72 brasl %r14,lockdep_sys_exit 73#endif 74 .endm 75 76 .macro LPP newpp 77#if IS_ENABLED(CONFIG_KVM) 78 tm __LC_MACHINE_FLAGS+6,0x20 # MACHINE_FLAG_LPP 79 jz .+8 80 .insn s,0xb2800000,\newpp 81#endif 82 .endm 83 84 .macro HANDLE_SIE_INTERCEPT scratch,reason 85#if IS_ENABLED(CONFIG_KVM) 86 tmhh %r8,0x0001 # interrupting from user ? 87 jnz .+62 88 lgr \scratch,%r9 89 slg \scratch,BASED(.Lsie_critical) 90 clg \scratch,BASED(.Lsie_critical_length) 91 .if \reason==1 92 # Some program interrupts are suppressing (e.g. protection). 93 # We must also check the instruction after SIE in that case. 94 # do_protection_exception will rewind to .Lrewind_pad 95 jh .+42 96 .else 97 jhe .+42 98 .endif 99 lg %r14,__SF_EMPTY(%r15) # get control block pointer 100 LPP __SF_EMPTY+16(%r15) # set host id 101 ni __SIE_PROG0C+3(%r14),0xfe # no longer in SIE 102 lctlg %c1,%c1,__LC_USER_ASCE # load primary asce 103 larl %r9,sie_exit # skip forward to sie_exit 104 mvi __SF_EMPTY+31(%r15),\reason # set exit reason 105#endif 106 .endm 107 108 .macro CHECK_STACK stacksize,savearea 109#ifdef CONFIG_CHECK_STACK 110 tml %r15,\stacksize - CONFIG_STACK_GUARD 111 lghi %r14,\savearea 112 jz stack_overflow 113#endif 114 .endm 115 116 .macro SWITCH_ASYNC savearea,stack,shift 117 tmhh %r8,0x0001 # interrupting from user ? 118 jnz 1f 119 lgr %r14,%r9 120 slg %r14,BASED(.Lcritical_start) 121 clg %r14,BASED(.Lcritical_length) 122 jhe 0f 123 lghi %r11,\savearea # inside critical section, do cleanup 124 brasl %r14,cleanup_critical 125 tmhh %r8,0x0001 # retest problem state after cleanup 126 jnz 1f 1270: lg %r14,\stack # are we already on the target stack? 128 slgr %r14,%r15 129 srag %r14,%r14,\shift 130 jnz 1f 131 CHECK_STACK 1<<\shift,\savearea 132 aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) 133 j 2f 1341: lg %r15,\stack # load target stack 1352: la %r11,STACK_FRAME_OVERHEAD(%r15) 136 .endm 137 138 .macro UPDATE_VTIME scratch,enter_timer 139 lg \scratch,__LC_EXIT_TIMER 140 slg \scratch,\enter_timer 141 alg \scratch,__LC_USER_TIMER 142 stg \scratch,__LC_USER_TIMER 143 lg \scratch,__LC_LAST_UPDATE_TIMER 144 slg \scratch,__LC_EXIT_TIMER 145 alg \scratch,__LC_SYSTEM_TIMER 146 stg \scratch,__LC_SYSTEM_TIMER 147 mvc __LC_LAST_UPDATE_TIMER(8),\enter_timer 148 .endm 149 150 .macro LAST_BREAK scratch 151 srag \scratch,%r10,23 152 jz .+10 153 stg %r10,__TI_last_break(%r12) 154 .endm 155 156 .macro REENABLE_IRQS 157 stg %r8,__LC_RETURN_PSW 158 ni __LC_RETURN_PSW,0xbf 159 ssm __LC_RETURN_PSW 160 .endm 161 162 .macro STCK savearea 163#ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES 164 .insn s,0xb27c0000,\savearea # store clock fast 165#else 166 .insn s,0xb2050000,\savearea # store clock 167#endif 168 .endm 169 170 .section .kprobes.text, "ax" 171 172/* 173 * Scheduler resume function, called by switch_to 174 * gpr2 = (task_struct *) prev 175 * gpr3 = (task_struct *) next 176 * Returns: 177 * gpr2 = prev 178 */ 179ENTRY(__switch_to) 180 stmg %r6,%r15,__SF_GPRS(%r15) # store gprs of prev task 181 stg %r15,__THREAD_ksp(%r2) # store kernel stack of prev 182 lg %r4,__THREAD_info(%r2) # get thread_info of prev 183 lg %r5,__THREAD_info(%r3) # get thread_info of next 184 lgr %r15,%r5 185 aghi %r15,STACK_INIT # end of kernel stack of next 186 stg %r3,__LC_CURRENT # store task struct of next 187 stg %r5,__LC_THREAD_INFO # store thread info of next 188 stg %r15,__LC_KERNEL_STACK # store end of kernel stack 189 lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4 190 mvc __LC_CURRENT_PID+4(4,%r0),__TASK_pid(%r3) # store pid of next 191 lg %r15,__THREAD_ksp(%r3) # load kernel stack of next 192 lmg %r6,%r15,__SF_GPRS(%r15) # load gprs of next task 193 br %r14 194 195.L__critical_start: 196/* 197 * SVC interrupt handler routine. System calls are synchronous events and 198 * are executed with interrupts enabled. 199 */ 200 201ENTRY(system_call) 202 stpt __LC_SYNC_ENTER_TIMER 203.Lsysc_stmg: 204 stmg %r8,%r15,__LC_SAVE_AREA_SYNC 205 lg %r10,__LC_LAST_BREAK 206 lg %r12,__LC_THREAD_INFO 207 lghi %r14,_PIF_SYSCALL 208.Lsysc_per: 209 lg %r15,__LC_KERNEL_STACK 210 la %r11,STACK_FRAME_OVERHEAD(%r15) # pointer to pt_regs 211.Lsysc_vtime: 212 UPDATE_VTIME %r13,__LC_SYNC_ENTER_TIMER 213 LAST_BREAK %r13 214 stmg %r0,%r7,__PT_R0(%r11) 215 mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC 216 mvc __PT_PSW(16,%r11),__LC_SVC_OLD_PSW 217 mvc __PT_INT_CODE(4,%r11),__LC_SVC_ILC 218 stg %r14,__PT_FLAGS(%r11) 219.Lsysc_do_svc: 220 lg %r10,__TI_sysc_table(%r12) # address of system call table 221 llgh %r8,__PT_INT_CODE+2(%r11) 222 slag %r8,%r8,2 # shift and test for svc 0 223 jnz .Lsysc_nr_ok 224 # svc 0: system call number in %r1 225 llgfr %r1,%r1 # clear high word in r1 226 cghi %r1,NR_syscalls 227 jnl .Lsysc_nr_ok 228 sth %r1,__PT_INT_CODE+2(%r11) 229 slag %r8,%r1,2 230.Lsysc_nr_ok: 231 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) 232 stg %r2,__PT_ORIG_GPR2(%r11) 233 stg %r7,STACK_FRAME_OVERHEAD(%r15) 234 lgf %r9,0(%r8,%r10) # get system call add. 235 tm __TI_flags+7(%r12),_TIF_TRACE 236 jnz .Lsysc_tracesys 237 basr %r14,%r9 # call sys_xxxx 238 stg %r2,__PT_R2(%r11) # store return value 239 240.Lsysc_return: 241 LOCKDEP_SYS_EXIT 242.Lsysc_tif: 243 tm __PT_PSW+1(%r11),0x01 # returning to user ? 244 jno .Lsysc_restore 245 tm __PT_FLAGS+7(%r11),_PIF_WORK 246 jnz .Lsysc_work 247 tm __TI_flags+7(%r12),_TIF_WORK 248 jnz .Lsysc_work # check for work 249 tm __LC_CPU_FLAGS+7,_CIF_WORK 250 jnz .Lsysc_work 251.Lsysc_restore: 252 lg %r14,__LC_VDSO_PER_CPU 253 lmg %r0,%r10,__PT_R0(%r11) 254 mvc __LC_RETURN_PSW(16),__PT_PSW(%r11) 255 stpt __LC_EXIT_TIMER 256 mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER 257 lmg %r11,%r15,__PT_R11(%r11) 258 lpswe __LC_RETURN_PSW 259.Lsysc_done: 260 261# 262# One of the work bits is on. Find out which one. 263# 264.Lsysc_work: 265 tm __LC_CPU_FLAGS+7,_CIF_MCCK_PENDING 266 jo .Lsysc_mcck_pending 267 tm __TI_flags+7(%r12),_TIF_NEED_RESCHED 268 jo .Lsysc_reschedule 269#ifdef CONFIG_UPROBES 270 tm __TI_flags+7(%r12),_TIF_UPROBE 271 jo .Lsysc_uprobe_notify 272#endif 273 tm __PT_FLAGS+7(%r11),_PIF_PER_TRAP 274 jo .Lsysc_singlestep 275 tm __TI_flags+7(%r12),_TIF_SIGPENDING 276 jo .Lsysc_sigpending 277 tm __TI_flags+7(%r12),_TIF_NOTIFY_RESUME 278 jo .Lsysc_notify_resume 279 tm __LC_CPU_FLAGS+7,_CIF_ASCE 280 jo .Lsysc_uaccess 281 j .Lsysc_return # beware of critical section cleanup 282 283# 284# _TIF_NEED_RESCHED is set, call schedule 285# 286.Lsysc_reschedule: 287 larl %r14,.Lsysc_return 288 jg schedule 289 290# 291# _CIF_MCCK_PENDING is set, call handler 292# 293.Lsysc_mcck_pending: 294 larl %r14,.Lsysc_return 295 jg s390_handle_mcck # TIF bit will be cleared by handler 296 297# 298# _CIF_ASCE is set, load user space asce 299# 300.Lsysc_uaccess: 301 ni __LC_CPU_FLAGS+7,255-_CIF_ASCE 302 lctlg %c1,%c1,__LC_USER_ASCE # load primary asce 303 j .Lsysc_return 304 305# 306# _TIF_SIGPENDING is set, call do_signal 307# 308.Lsysc_sigpending: 309 lgr %r2,%r11 # pass pointer to pt_regs 310 brasl %r14,do_signal 311 tm __PT_FLAGS+7(%r11),_PIF_SYSCALL 312 jno .Lsysc_return 313 lmg %r2,%r7,__PT_R2(%r11) # load svc arguments 314 lg %r10,__TI_sysc_table(%r12) # address of system call table 315 lghi %r8,0 # svc 0 returns -ENOSYS 316 llgh %r1,__PT_INT_CODE+2(%r11) # load new svc number 317 cghi %r1,NR_syscalls 318 jnl .Lsysc_nr_ok # invalid svc number -> do svc 0 319 slag %r8,%r1,2 320 j .Lsysc_nr_ok # restart svc 321 322# 323# _TIF_NOTIFY_RESUME is set, call do_notify_resume 324# 325.Lsysc_notify_resume: 326 lgr %r2,%r11 # pass pointer to pt_regs 327 larl %r14,.Lsysc_return 328 jg do_notify_resume 329 330# 331# _TIF_UPROBE is set, call uprobe_notify_resume 332# 333#ifdef CONFIG_UPROBES 334.Lsysc_uprobe_notify: 335 lgr %r2,%r11 # pass pointer to pt_regs 336 larl %r14,.Lsysc_return 337 jg uprobe_notify_resume 338#endif 339 340# 341# _PIF_PER_TRAP is set, call do_per_trap 342# 343.Lsysc_singlestep: 344 ni __PT_FLAGS+7(%r11),255-_PIF_PER_TRAP 345 lgr %r2,%r11 # pass pointer to pt_regs 346 larl %r14,.Lsysc_return 347 jg do_per_trap 348 349# 350# call tracehook_report_syscall_entry/tracehook_report_syscall_exit before 351# and after the system call 352# 353.Lsysc_tracesys: 354 lgr %r2,%r11 # pass pointer to pt_regs 355 la %r3,0 356 llgh %r0,__PT_INT_CODE+2(%r11) 357 stg %r0,__PT_R2(%r11) 358 brasl %r14,do_syscall_trace_enter 359 lghi %r0,NR_syscalls 360 clgr %r0,%r2 361 jnh .Lsysc_tracenogo 362 sllg %r8,%r2,2 363 lgf %r9,0(%r8,%r10) 364.Lsysc_tracego: 365 lmg %r3,%r7,__PT_R3(%r11) 366 stg %r7,STACK_FRAME_OVERHEAD(%r15) 367 lg %r2,__PT_ORIG_GPR2(%r11) 368 basr %r14,%r9 # call sys_xxx 369 stg %r2,__PT_R2(%r11) # store return value 370.Lsysc_tracenogo: 371 tm __TI_flags+7(%r12),_TIF_TRACE 372 jz .Lsysc_return 373 lgr %r2,%r11 # pass pointer to pt_regs 374 larl %r14,.Lsysc_return 375 jg do_syscall_trace_exit 376 377# 378# a new process exits the kernel with ret_from_fork 379# 380ENTRY(ret_from_fork) 381 la %r11,STACK_FRAME_OVERHEAD(%r15) 382 lg %r12,__LC_THREAD_INFO 383 brasl %r14,schedule_tail 384 TRACE_IRQS_ON 385 ssm __LC_SVC_NEW_PSW # reenable interrupts 386 tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ? 387 jne .Lsysc_tracenogo 388 # it's a kernel thread 389 lmg %r9,%r10,__PT_R9(%r11) # load gprs 390ENTRY(kernel_thread_starter) 391 la %r2,0(%r10) 392 basr %r14,%r9 393 j .Lsysc_tracenogo 394 395/* 396 * Program check handler routine 397 */ 398 399ENTRY(pgm_check_handler) 400 stpt __LC_SYNC_ENTER_TIMER 401 stmg %r8,%r15,__LC_SAVE_AREA_SYNC 402 lg %r10,__LC_LAST_BREAK 403 lg %r12,__LC_THREAD_INFO 404 larl %r13,system_call 405 lmg %r8,%r9,__LC_PGM_OLD_PSW 406 HANDLE_SIE_INTERCEPT %r14,1 407 tmhh %r8,0x0001 # test problem state bit 408 jnz 1f # -> fault in user space 409 tmhh %r8,0x4000 # PER bit set in old PSW ? 410 jnz 0f # -> enabled, can't be a double fault 411 tm __LC_PGM_ILC+3,0x80 # check for per exception 412 jnz .Lpgm_svcper # -> single stepped svc 4130: CHECK_STACK STACK_SIZE,__LC_SAVE_AREA_SYNC 414 aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) 415 j 2f 4161: UPDATE_VTIME %r14,__LC_SYNC_ENTER_TIMER 417 LAST_BREAK %r14 418 lg %r15,__LC_KERNEL_STACK 419 lg %r14,__TI_task(%r12) 420 lghi %r13,__LC_PGM_TDB 421 tm __LC_PGM_ILC+2,0x02 # check for transaction abort 422 jz 2f 423 mvc __THREAD_trap_tdb(256,%r14),0(%r13) 4242: la %r11,STACK_FRAME_OVERHEAD(%r15) 425 stmg %r0,%r7,__PT_R0(%r11) 426 mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC 427 stmg %r8,%r9,__PT_PSW(%r11) 428 mvc __PT_INT_CODE(4,%r11),__LC_PGM_ILC 429 mvc __PT_INT_PARM_LONG(8,%r11),__LC_TRANS_EXC_CODE 430 xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11) 431 stg %r10,__PT_ARGS(%r11) 432 tm __LC_PGM_ILC+3,0x80 # check for per exception 433 jz 0f 434 tmhh %r8,0x0001 # kernel per event ? 435 jz .Lpgm_kprobe 436 oi __PT_FLAGS+7(%r11),_PIF_PER_TRAP 437 mvc __THREAD_per_address(8,%r14),__LC_PER_ADDRESS 438 mvc __THREAD_per_cause(2,%r14),__LC_PER_CODE 439 mvc __THREAD_per_paid(1,%r14),__LC_PER_ACCESS_ID 4400: REENABLE_IRQS 441 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) 442 larl %r1,pgm_check_table 443 llgh %r10,__PT_INT_CODE+2(%r11) 444 nill %r10,0x007f 445 sll %r10,2 446 je .Lsysc_return 447 lgf %r1,0(%r10,%r1) # load address of handler routine 448 lgr %r2,%r11 # pass pointer to pt_regs 449 basr %r14,%r1 # branch to interrupt-handler 450 j .Lsysc_return 451 452# 453# PER event in supervisor state, must be kprobes 454# 455.Lpgm_kprobe: 456 REENABLE_IRQS 457 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) 458 lgr %r2,%r11 # pass pointer to pt_regs 459 brasl %r14,do_per_trap 460 j .Lsysc_return 461 462# 463# single stepped system call 464# 465.Lpgm_svcper: 466 mvc __LC_RETURN_PSW(8),__LC_SVC_NEW_PSW 467 larl %r14,.Lsysc_per 468 stg %r14,__LC_RETURN_PSW+8 469 lghi %r14,_PIF_SYSCALL | _PIF_PER_TRAP 470 lpswe __LC_RETURN_PSW # branch to .Lsysc_per and enable irqs 471 472/* 473 * IO interrupt handler routine 474 */ 475ENTRY(io_int_handler) 476 STCK __LC_INT_CLOCK 477 stpt __LC_ASYNC_ENTER_TIMER 478 stmg %r8,%r15,__LC_SAVE_AREA_ASYNC 479 lg %r10,__LC_LAST_BREAK 480 lg %r12,__LC_THREAD_INFO 481 larl %r13,system_call 482 lmg %r8,%r9,__LC_IO_OLD_PSW 483 HANDLE_SIE_INTERCEPT %r14,2 484 SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT 485 tmhh %r8,0x0001 # interrupting from user? 486 jz .Lio_skip 487 UPDATE_VTIME %r14,__LC_ASYNC_ENTER_TIMER 488 LAST_BREAK %r14 489.Lio_skip: 490 stmg %r0,%r7,__PT_R0(%r11) 491 mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC 492 stmg %r8,%r9,__PT_PSW(%r11) 493 mvc __PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID 494 xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11) 495 TRACE_IRQS_OFF 496 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) 497.Lio_loop: 498 lgr %r2,%r11 # pass pointer to pt_regs 499 lghi %r3,IO_INTERRUPT 500 tm __PT_INT_CODE+8(%r11),0x80 # adapter interrupt ? 501 jz .Lio_call 502 lghi %r3,THIN_INTERRUPT 503.Lio_call: 504 brasl %r14,do_IRQ 505 tm __LC_MACHINE_FLAGS+6,0x10 # MACHINE_FLAG_LPAR 506 jz .Lio_return 507 tpi 0 508 jz .Lio_return 509 mvc __PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID 510 j .Lio_loop 511.Lio_return: 512 LOCKDEP_SYS_EXIT 513 TRACE_IRQS_ON 514.Lio_tif: 515 tm __TI_flags+7(%r12),_TIF_WORK 516 jnz .Lio_work # there is work to do (signals etc.) 517 tm __LC_CPU_FLAGS+7,_CIF_WORK 518 jnz .Lio_work 519.Lio_restore: 520 lg %r14,__LC_VDSO_PER_CPU 521 lmg %r0,%r10,__PT_R0(%r11) 522 mvc __LC_RETURN_PSW(16),__PT_PSW(%r11) 523 stpt __LC_EXIT_TIMER 524 mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER 525 lmg %r11,%r15,__PT_R11(%r11) 526 lpswe __LC_RETURN_PSW 527.Lio_done: 528 529# 530# There is work todo, find out in which context we have been interrupted: 531# 1) if we return to user space we can do all _TIF_WORK work 532# 2) if we return to kernel code and kvm is enabled check if we need to 533# modify the psw to leave SIE 534# 3) if we return to kernel code and preemptive scheduling is enabled check 535# the preemption counter and if it is zero call preempt_schedule_irq 536# Before any work can be done, a switch to the kernel stack is required. 537# 538.Lio_work: 539 tm __PT_PSW+1(%r11),0x01 # returning to user ? 540 jo .Lio_work_user # yes -> do resched & signal 541#ifdef CONFIG_PREEMPT 542 # check for preemptive scheduling 543 icm %r0,15,__TI_precount(%r12) 544 jnz .Lio_restore # preemption is disabled 545 tm __TI_flags+7(%r12),_TIF_NEED_RESCHED 546 jno .Lio_restore 547 # switch to kernel stack 548 lg %r1,__PT_R15(%r11) 549 aghi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE) 550 mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) 551 xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) 552 la %r11,STACK_FRAME_OVERHEAD(%r1) 553 lgr %r15,%r1 554 # TRACE_IRQS_ON already done at .Lio_return, call 555 # TRACE_IRQS_OFF to keep things symmetrical 556 TRACE_IRQS_OFF 557 brasl %r14,preempt_schedule_irq 558 j .Lio_return 559#else 560 j .Lio_restore 561#endif 562 563# 564# Need to do work before returning to userspace, switch to kernel stack 565# 566.Lio_work_user: 567 lg %r1,__LC_KERNEL_STACK 568 mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) 569 xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) 570 la %r11,STACK_FRAME_OVERHEAD(%r1) 571 lgr %r15,%r1 572 573# 574# One of the work bits is on. Find out which one. 575# 576.Lio_work_tif: 577 tm __LC_CPU_FLAGS+7,_CIF_MCCK_PENDING 578 jo .Lio_mcck_pending 579 tm __TI_flags+7(%r12),_TIF_NEED_RESCHED 580 jo .Lio_reschedule 581 tm __TI_flags+7(%r12),_TIF_SIGPENDING 582 jo .Lio_sigpending 583 tm __TI_flags+7(%r12),_TIF_NOTIFY_RESUME 584 jo .Lio_notify_resume 585 tm __LC_CPU_FLAGS+7,_CIF_ASCE 586 jo .Lio_uaccess 587 j .Lio_return # beware of critical section cleanup 588 589# 590# _CIF_MCCK_PENDING is set, call handler 591# 592.Lio_mcck_pending: 593 # TRACE_IRQS_ON already done at .Lio_return 594 brasl %r14,s390_handle_mcck # TIF bit will be cleared by handler 595 TRACE_IRQS_OFF 596 j .Lio_return 597 598# 599# _CIF_ASCE is set, load user space asce 600# 601.Lio_uaccess: 602 ni __LC_CPU_FLAGS+7,255-_CIF_ASCE 603 lctlg %c1,%c1,__LC_USER_ASCE # load primary asce 604 j .Lio_return 605 606# 607# _TIF_NEED_RESCHED is set, call schedule 608# 609.Lio_reschedule: 610 # TRACE_IRQS_ON already done at .Lio_return 611 ssm __LC_SVC_NEW_PSW # reenable interrupts 612 brasl %r14,schedule # call scheduler 613 ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts 614 TRACE_IRQS_OFF 615 j .Lio_return 616 617# 618# _TIF_SIGPENDING or is set, call do_signal 619# 620.Lio_sigpending: 621 # TRACE_IRQS_ON already done at .Lio_return 622 ssm __LC_SVC_NEW_PSW # reenable interrupts 623 lgr %r2,%r11 # pass pointer to pt_regs 624 brasl %r14,do_signal 625 ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts 626 TRACE_IRQS_OFF 627 j .Lio_return 628 629# 630# _TIF_NOTIFY_RESUME or is set, call do_notify_resume 631# 632.Lio_notify_resume: 633 # TRACE_IRQS_ON already done at .Lio_return 634 ssm __LC_SVC_NEW_PSW # reenable interrupts 635 lgr %r2,%r11 # pass pointer to pt_regs 636 brasl %r14,do_notify_resume 637 ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts 638 TRACE_IRQS_OFF 639 j .Lio_return 640 641/* 642 * External interrupt handler routine 643 */ 644ENTRY(ext_int_handler) 645 STCK __LC_INT_CLOCK 646 stpt __LC_ASYNC_ENTER_TIMER 647 stmg %r8,%r15,__LC_SAVE_AREA_ASYNC 648 lg %r10,__LC_LAST_BREAK 649 lg %r12,__LC_THREAD_INFO 650 larl %r13,system_call 651 lmg %r8,%r9,__LC_EXT_OLD_PSW 652 HANDLE_SIE_INTERCEPT %r14,3 653 SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT 654 tmhh %r8,0x0001 # interrupting from user ? 655 jz .Lext_skip 656 UPDATE_VTIME %r14,__LC_ASYNC_ENTER_TIMER 657 LAST_BREAK %r14 658.Lext_skip: 659 stmg %r0,%r7,__PT_R0(%r11) 660 mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC 661 stmg %r8,%r9,__PT_PSW(%r11) 662 lghi %r1,__LC_EXT_PARAMS2 663 mvc __PT_INT_CODE(4,%r11),__LC_EXT_CPU_ADDR 664 mvc __PT_INT_PARM(4,%r11),__LC_EXT_PARAMS 665 mvc __PT_INT_PARM_LONG(8,%r11),0(%r1) 666 xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11) 667 TRACE_IRQS_OFF 668 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) 669 lgr %r2,%r11 # pass pointer to pt_regs 670 lghi %r3,EXT_INTERRUPT 671 brasl %r14,do_IRQ 672 j .Lio_return 673 674/* 675 * Load idle PSW. The second "half" of this function is in .Lcleanup_idle. 676 */ 677ENTRY(psw_idle) 678 stg %r3,__SF_EMPTY(%r15) 679 larl %r1,.Lpsw_idle_lpsw+4 680 stg %r1,__SF_EMPTY+8(%r15) 681 STCK __CLOCK_IDLE_ENTER(%r2) 682 stpt __TIMER_IDLE_ENTER(%r2) 683.Lpsw_idle_lpsw: 684 lpswe __SF_EMPTY(%r15) 685 br %r14 686.Lpsw_idle_end: 687 688.L__critical_end: 689 690/* 691 * Machine check handler routines 692 */ 693ENTRY(mcck_int_handler) 694 STCK __LC_MCCK_CLOCK 695 la %r1,4095 # revalidate r1 696 spt __LC_CPU_TIMER_SAVE_AREA-4095(%r1) # revalidate cpu timer 697 lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs 698 lg %r10,__LC_LAST_BREAK 699 lg %r12,__LC_THREAD_INFO 700 larl %r13,system_call 701 lmg %r8,%r9,__LC_MCK_OLD_PSW 702 HANDLE_SIE_INTERCEPT %r14,4 703 tm __LC_MCCK_CODE,0x80 # system damage? 704 jo .Lmcck_panic # yes -> rest of mcck code invalid 705 lghi %r14,__LC_CPU_TIMER_SAVE_AREA 706 mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) 707 tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid? 708 jo 3f 709 la %r14,__LC_SYNC_ENTER_TIMER 710 clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER 711 jl 0f 712 la %r14,__LC_ASYNC_ENTER_TIMER 7130: clc 0(8,%r14),__LC_EXIT_TIMER 714 jl 1f 715 la %r14,__LC_EXIT_TIMER 7161: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER 717 jl 2f 718 la %r14,__LC_LAST_UPDATE_TIMER 7192: spt 0(%r14) 720 mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) 7213: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid? 722 jno .Lmcck_panic # no -> skip cleanup critical 723 SWITCH_ASYNC __LC_GPREGS_SAVE_AREA+64,__LC_PANIC_STACK,PAGE_SHIFT 724 tm %r8,0x0001 # interrupting from user ? 725 jz .Lmcck_skip 726 UPDATE_VTIME %r14,__LC_MCCK_ENTER_TIMER 727 LAST_BREAK %r14 728.Lmcck_skip: 729 lghi %r14,__LC_GPREGS_SAVE_AREA+64 730 stmg %r0,%r7,__PT_R0(%r11) 731 mvc __PT_R8(64,%r11),0(%r14) 732 stmg %r8,%r9,__PT_PSW(%r11) 733 xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11) 734 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) 735 lgr %r2,%r11 # pass pointer to pt_regs 736 brasl %r14,s390_do_machine_check 737 tm __PT_PSW+1(%r11),0x01 # returning to user ? 738 jno .Lmcck_return 739 lg %r1,__LC_KERNEL_STACK # switch to kernel stack 740 mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) 741 xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) 742 la %r11,STACK_FRAME_OVERHEAD(%r1) 743 lgr %r15,%r1 744 ssm __LC_PGM_NEW_PSW # turn dat on, keep irqs off 745 tm __LC_CPU_FLAGS+7,_CIF_MCCK_PENDING 746 jno .Lmcck_return 747 TRACE_IRQS_OFF 748 brasl %r14,s390_handle_mcck 749 TRACE_IRQS_ON 750.Lmcck_return: 751 lg %r14,__LC_VDSO_PER_CPU 752 lmg %r0,%r10,__PT_R0(%r11) 753 mvc __LC_RETURN_MCCK_PSW(16),__PT_PSW(%r11) # move return PSW 754 tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? 755 jno 0f 756 stpt __LC_EXIT_TIMER 757 mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER 7580: lmg %r11,%r15,__PT_R11(%r11) 759 lpswe __LC_RETURN_MCCK_PSW 760 761.Lmcck_panic: 762 lg %r14,__LC_PANIC_STACK 763 slgr %r14,%r15 764 srag %r14,%r14,PAGE_SHIFT 765 jz 0f 766 lg %r15,__LC_PANIC_STACK 7670: aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) 768 j .Lmcck_skip 769 770# 771# PSW restart interrupt handler 772# 773ENTRY(restart_int_handler) 774 stg %r15,__LC_SAVE_AREA_RESTART 775 lg %r15,__LC_RESTART_STACK 776 aghi %r15,-__PT_SIZE # create pt_regs on stack 777 xc 0(__PT_SIZE,%r15),0(%r15) 778 stmg %r0,%r14,__PT_R0(%r15) 779 mvc __PT_R15(8,%r15),__LC_SAVE_AREA_RESTART 780 mvc __PT_PSW(16,%r15),__LC_RST_OLD_PSW # store restart old psw 781 aghi %r15,-STACK_FRAME_OVERHEAD # create stack frame on stack 782 xc 0(STACK_FRAME_OVERHEAD,%r15),0(%r15) 783 lg %r1,__LC_RESTART_FN # load fn, parm & source cpu 784 lg %r2,__LC_RESTART_DATA 785 lg %r3,__LC_RESTART_SOURCE 786 ltgr %r3,%r3 # test source cpu address 787 jm 1f # negative -> skip source stop 7880: sigp %r4,%r3,SIGP_SENSE # sigp sense to source cpu 789 brc 10,0b # wait for status stored 7901: basr %r14,%r1 # call function 791 stap __SF_EMPTY(%r15) # store cpu address 792 llgh %r3,__SF_EMPTY(%r15) 7932: sigp %r4,%r3,SIGP_STOP # sigp stop to current cpu 794 brc 2,2b 7953: j 3b 796 797 .section .kprobes.text, "ax" 798 799#ifdef CONFIG_CHECK_STACK 800/* 801 * The synchronous or the asynchronous stack overflowed. We are dead. 802 * No need to properly save the registers, we are going to panic anyway. 803 * Setup a pt_regs so that show_trace can provide a good call trace. 804 */ 805stack_overflow: 806 lg %r15,__LC_PANIC_STACK # change to panic stack 807 la %r11,STACK_FRAME_OVERHEAD(%r15) 808 stmg %r0,%r7,__PT_R0(%r11) 809 stmg %r8,%r9,__PT_PSW(%r11) 810 mvc __PT_R8(64,%r11),0(%r14) 811 stg %r10,__PT_ORIG_GPR2(%r11) # store last break to orig_gpr2 812 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) 813 lgr %r2,%r11 # pass pointer to pt_regs 814 jg kernel_stack_overflow 815#endif 816 817 .align 8 818.Lcleanup_table: 819 .quad system_call 820 .quad .Lsysc_do_svc 821 .quad .Lsysc_tif 822 .quad .Lsysc_restore 823 .quad .Lsysc_done 824 .quad .Lio_tif 825 .quad .Lio_restore 826 .quad .Lio_done 827 .quad psw_idle 828 .quad .Lpsw_idle_end 829 830cleanup_critical: 831 clg %r9,BASED(.Lcleanup_table) # system_call 832 jl 0f 833 clg %r9,BASED(.Lcleanup_table+8) # .Lsysc_do_svc 834 jl .Lcleanup_system_call 835 clg %r9,BASED(.Lcleanup_table+16) # .Lsysc_tif 836 jl 0f 837 clg %r9,BASED(.Lcleanup_table+24) # .Lsysc_restore 838 jl .Lcleanup_sysc_tif 839 clg %r9,BASED(.Lcleanup_table+32) # .Lsysc_done 840 jl .Lcleanup_sysc_restore 841 clg %r9,BASED(.Lcleanup_table+40) # .Lio_tif 842 jl 0f 843 clg %r9,BASED(.Lcleanup_table+48) # .Lio_restore 844 jl .Lcleanup_io_tif 845 clg %r9,BASED(.Lcleanup_table+56) # .Lio_done 846 jl .Lcleanup_io_restore 847 clg %r9,BASED(.Lcleanup_table+64) # psw_idle 848 jl 0f 849 clg %r9,BASED(.Lcleanup_table+72) # .Lpsw_idle_end 850 jl .Lcleanup_idle 8510: br %r14 852 853 854.Lcleanup_system_call: 855 # check if stpt has been executed 856 clg %r9,BASED(.Lcleanup_system_call_insn) 857 jh 0f 858 mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER 859 cghi %r11,__LC_SAVE_AREA_ASYNC 860 je 0f 861 mvc __LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER 8620: # check if stmg has been executed 863 clg %r9,BASED(.Lcleanup_system_call_insn+8) 864 jh 0f 865 mvc __LC_SAVE_AREA_SYNC(64),0(%r11) 8660: # check if base register setup + TIF bit load has been done 867 clg %r9,BASED(.Lcleanup_system_call_insn+16) 868 jhe 0f 869 # set up saved registers r10 and r12 870 stg %r10,16(%r11) # r10 last break 871 stg %r12,32(%r11) # r12 thread-info pointer 8720: # check if the user time update has been done 873 clg %r9,BASED(.Lcleanup_system_call_insn+24) 874 jh 0f 875 lg %r15,__LC_EXIT_TIMER 876 slg %r15,__LC_SYNC_ENTER_TIMER 877 alg %r15,__LC_USER_TIMER 878 stg %r15,__LC_USER_TIMER 8790: # check if the system time update has been done 880 clg %r9,BASED(.Lcleanup_system_call_insn+32) 881 jh 0f 882 lg %r15,__LC_LAST_UPDATE_TIMER 883 slg %r15,__LC_EXIT_TIMER 884 alg %r15,__LC_SYSTEM_TIMER 885 stg %r15,__LC_SYSTEM_TIMER 8860: # update accounting time stamp 887 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 888 # do LAST_BREAK 889 lg %r9,16(%r11) 890 srag %r9,%r9,23 891 jz 0f 892 mvc __TI_last_break(8,%r12),16(%r11) 8930: # set up saved register r11 894 lg %r15,__LC_KERNEL_STACK 895 la %r9,STACK_FRAME_OVERHEAD(%r15) 896 stg %r9,24(%r11) # r11 pt_regs pointer 897 # fill pt_regs 898 mvc __PT_R8(64,%r9),__LC_SAVE_AREA_SYNC 899 stmg %r0,%r7,__PT_R0(%r9) 900 mvc __PT_PSW(16,%r9),__LC_SVC_OLD_PSW 901 mvc __PT_INT_CODE(4,%r9),__LC_SVC_ILC 902 xc __PT_FLAGS(8,%r9),__PT_FLAGS(%r9) 903 mvi __PT_FLAGS+7(%r9),_PIF_SYSCALL 904 # setup saved register r15 905 stg %r15,56(%r11) # r15 stack pointer 906 # set new psw address and exit 907 larl %r9,.Lsysc_do_svc 908 br %r14 909.Lcleanup_system_call_insn: 910 .quad system_call 911 .quad .Lsysc_stmg 912 .quad .Lsysc_per 913 .quad .Lsysc_vtime+18 914 .quad .Lsysc_vtime+42 915 916.Lcleanup_sysc_tif: 917 larl %r9,.Lsysc_tif 918 br %r14 919 920.Lcleanup_sysc_restore: 921 clg %r9,BASED(.Lcleanup_sysc_restore_insn) 922 je 0f 923 lg %r9,24(%r11) # get saved pointer to pt_regs 924 mvc __LC_RETURN_PSW(16),__PT_PSW(%r9) 925 mvc 0(64,%r11),__PT_R8(%r9) 926 lmg %r0,%r7,__PT_R0(%r9) 9270: lmg %r8,%r9,__LC_RETURN_PSW 928 br %r14 929.Lcleanup_sysc_restore_insn: 930 .quad .Lsysc_done - 4 931 932.Lcleanup_io_tif: 933 larl %r9,.Lio_tif 934 br %r14 935 936.Lcleanup_io_restore: 937 clg %r9,BASED(.Lcleanup_io_restore_insn) 938 je 0f 939 lg %r9,24(%r11) # get saved r11 pointer to pt_regs 940 mvc __LC_RETURN_PSW(16),__PT_PSW(%r9) 941 mvc 0(64,%r11),__PT_R8(%r9) 942 lmg %r0,%r7,__PT_R0(%r9) 9430: lmg %r8,%r9,__LC_RETURN_PSW 944 br %r14 945.Lcleanup_io_restore_insn: 946 .quad .Lio_done - 4 947 948.Lcleanup_idle: 949 # copy interrupt clock & cpu timer 950 mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_INT_CLOCK 951 mvc __TIMER_IDLE_EXIT(8,%r2),__LC_ASYNC_ENTER_TIMER 952 cghi %r11,__LC_SAVE_AREA_ASYNC 953 je 0f 954 mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_MCCK_CLOCK 955 mvc __TIMER_IDLE_EXIT(8,%r2),__LC_MCCK_ENTER_TIMER 9560: # check if stck & stpt have been executed 957 clg %r9,BASED(.Lcleanup_idle_insn) 958 jhe 1f 959 mvc __CLOCK_IDLE_ENTER(8,%r2),__CLOCK_IDLE_EXIT(%r2) 960 mvc __TIMER_IDLE_ENTER(8,%r2),__TIMER_IDLE_EXIT(%r2) 9611: # account system time going idle 962 lg %r9,__LC_STEAL_TIMER 963 alg %r9,__CLOCK_IDLE_ENTER(%r2) 964 slg %r9,__LC_LAST_UPDATE_CLOCK 965 stg %r9,__LC_STEAL_TIMER 966 mvc __LC_LAST_UPDATE_CLOCK(8),__CLOCK_IDLE_EXIT(%r2) 967 lg %r9,__LC_SYSTEM_TIMER 968 alg %r9,__LC_LAST_UPDATE_TIMER 969 slg %r9,__TIMER_IDLE_ENTER(%r2) 970 stg %r9,__LC_SYSTEM_TIMER 971 mvc __LC_LAST_UPDATE_TIMER(8),__TIMER_IDLE_EXIT(%r2) 972 # prepare return psw 973 nihh %r8,0xfcfd # clear irq & wait state bits 974 lg %r9,48(%r11) # return from psw_idle 975 br %r14 976.Lcleanup_idle_insn: 977 .quad .Lpsw_idle_lpsw 978 979/* 980 * Integer constants 981 */ 982 .align 8 983.Lcritical_start: 984 .quad .L__critical_start 985.Lcritical_length: 986 .quad .L__critical_end - .L__critical_start 987 988 989#if IS_ENABLED(CONFIG_KVM) 990/* 991 * sie64a calling convention: 992 * %r2 pointer to sie control block 993 * %r3 guest register save area 994 */ 995ENTRY(sie64a) 996 stmg %r6,%r14,__SF_GPRS(%r15) # save kernel registers 997 stg %r2,__SF_EMPTY(%r15) # save control block pointer 998 stg %r3,__SF_EMPTY+8(%r15) # save guest register save area 999 xc __SF_EMPTY+16(16,%r15),__SF_EMPTY+16(%r15) # host id & reason 1000 lmg %r0,%r13,0(%r3) # load guest gprs 0-13 1001 lg %r14,__LC_GMAP # get gmap pointer 1002 ltgr %r14,%r14 1003 jz .Lsie_gmap 1004 lctlg %c1,%c1,__GMAP_ASCE(%r14) # load primary asce 1005.Lsie_gmap: 1006 lg %r14,__SF_EMPTY(%r15) # get control block pointer 1007 oi __SIE_PROG0C+3(%r14),1 # we are going into SIE now 1008 tm __SIE_PROG20+3(%r14),1 # last exit... 1009 jnz .Lsie_done 1010 LPP __SF_EMPTY(%r15) # set guest id 1011 sie 0(%r14) 1012.Lsie_done: 1013 LPP __SF_EMPTY+16(%r15) # set host id 1014 ni __SIE_PROG0C+3(%r14),0xfe # no longer in SIE 1015 lctlg %c1,%c1,__LC_USER_ASCE # load primary asce 1016# some program checks are suppressing. C code (e.g. do_protection_exception) 1017# will rewind the PSW by the ILC, which is 4 bytes in case of SIE. Other 1018# instructions between sie64a and .Lsie_done should not cause program 1019# interrupts. So lets use a nop (47 00 00 00) as a landing pad. 1020# See also HANDLE_SIE_INTERCEPT 1021.Lrewind_pad: 1022 nop 0 1023 .globl sie_exit 1024sie_exit: 1025 lg %r14,__SF_EMPTY+8(%r15) # load guest register save area 1026 stmg %r0,%r13,0(%r14) # save guest gprs 0-13 1027 lmg %r6,%r14,__SF_GPRS(%r15) # restore kernel registers 1028 lg %r2,__SF_EMPTY+24(%r15) # return exit reason code 1029 br %r14 1030.Lsie_fault: 1031 lghi %r14,-EFAULT 1032 stg %r14,__SF_EMPTY+24(%r15) # set exit reason code 1033 j sie_exit 1034 1035 .align 8 1036.Lsie_critical: 1037 .quad .Lsie_gmap 1038.Lsie_critical_length: 1039 .quad .Lsie_done - .Lsie_gmap 1040 1041 EX_TABLE(.Lrewind_pad,.Lsie_fault) 1042 EX_TABLE(sie_exit,.Lsie_fault) 1043#endif 1044 1045 .section .rodata, "a" 1046#define SYSCALL(esame,emu) .long esame 1047 .globl sys_call_table 1048sys_call_table: 1049#include "syscalls.S" 1050#undef SYSCALL 1051 1052#ifdef CONFIG_COMPAT 1053 1054#define SYSCALL(esame,emu) .long emu 1055 .globl sys_call_table_emu 1056sys_call_table_emu: 1057#include "syscalls.S" 1058#undef SYSCALL 1059#endif 1060