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 lgr %r1,%r2 182 aghi %r1,__TASK_thread # thread_struct of prev task 183 lg %r4,__TASK_thread_info(%r2) # get thread_info of prev 184 lg %r5,__TASK_thread_info(%r3) # get thread_info of next 185 stg %r15,__THREAD_ksp(%r1) # store kernel stack of prev 186 lgr %r1,%r3 187 aghi %r1,__TASK_thread # thread_struct of next task 188 lgr %r15,%r5 189 aghi %r15,STACK_INIT # end of kernel stack of next 190 stg %r3,__LC_CURRENT # store task struct of next 191 stg %r5,__LC_THREAD_INFO # store thread info of next 192 stg %r15,__LC_KERNEL_STACK # store end of kernel stack 193 lg %r15,__THREAD_ksp(%r1) # load kernel stack of next 194 lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4 195 mvc __LC_CURRENT_PID+4(4,%r0),__TASK_pid(%r3) # store pid of next 196 lmg %r6,%r15,__SF_GPRS(%r15) # load gprs of next task 197 br %r14 198 199.L__critical_start: 200/* 201 * SVC interrupt handler routine. System calls are synchronous events and 202 * are executed with interrupts enabled. 203 */ 204 205ENTRY(system_call) 206 stpt __LC_SYNC_ENTER_TIMER 207.Lsysc_stmg: 208 stmg %r8,%r15,__LC_SAVE_AREA_SYNC 209 lg %r10,__LC_LAST_BREAK 210 lg %r12,__LC_THREAD_INFO 211 lghi %r14,_PIF_SYSCALL 212.Lsysc_per: 213 lg %r15,__LC_KERNEL_STACK 214 la %r11,STACK_FRAME_OVERHEAD(%r15) # pointer to pt_regs 215.Lsysc_vtime: 216 UPDATE_VTIME %r13,__LC_SYNC_ENTER_TIMER 217 LAST_BREAK %r13 218 stmg %r0,%r7,__PT_R0(%r11) 219 mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC 220 mvc __PT_PSW(16,%r11),__LC_SVC_OLD_PSW 221 mvc __PT_INT_CODE(4,%r11),__LC_SVC_ILC 222 stg %r14,__PT_FLAGS(%r11) 223.Lsysc_do_svc: 224 lg %r10,__TI_sysc_table(%r12) # address of system call table 225 llgh %r8,__PT_INT_CODE+2(%r11) 226 slag %r8,%r8,2 # shift and test for svc 0 227 jnz .Lsysc_nr_ok 228 # svc 0: system call number in %r1 229 llgfr %r1,%r1 # clear high word in r1 230 cghi %r1,NR_syscalls 231 jnl .Lsysc_nr_ok 232 sth %r1,__PT_INT_CODE+2(%r11) 233 slag %r8,%r1,2 234.Lsysc_nr_ok: 235 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) 236 stg %r2,__PT_ORIG_GPR2(%r11) 237 stg %r7,STACK_FRAME_OVERHEAD(%r15) 238 lgf %r9,0(%r8,%r10) # get system call add. 239 tm __TI_flags+7(%r12),_TIF_TRACE 240 jnz .Lsysc_tracesys 241 basr %r14,%r9 # call sys_xxxx 242 stg %r2,__PT_R2(%r11) # store return value 243 244.Lsysc_return: 245 LOCKDEP_SYS_EXIT 246.Lsysc_tif: 247 tm __PT_PSW+1(%r11),0x01 # returning to user ? 248 jno .Lsysc_restore 249 tm __PT_FLAGS+7(%r11),_PIF_WORK 250 jnz .Lsysc_work 251 tm __TI_flags+7(%r12),_TIF_WORK 252 jnz .Lsysc_work # check for work 253 tm __LC_CPU_FLAGS+7,_CIF_WORK 254 jnz .Lsysc_work 255.Lsysc_restore: 256 lg %r14,__LC_VDSO_PER_CPU 257 lmg %r0,%r10,__PT_R0(%r11) 258 mvc __LC_RETURN_PSW(16),__PT_PSW(%r11) 259 stpt __LC_EXIT_TIMER 260 mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER 261 lmg %r11,%r15,__PT_R11(%r11) 262 lpswe __LC_RETURN_PSW 263.Lsysc_done: 264 265# 266# One of the work bits is on. Find out which one. 267# 268.Lsysc_work: 269 tm __LC_CPU_FLAGS+7,_CIF_MCCK_PENDING 270 jo .Lsysc_mcck_pending 271 tm __TI_flags+7(%r12),_TIF_NEED_RESCHED 272 jo .Lsysc_reschedule 273#ifdef CONFIG_UPROBES 274 tm __TI_flags+7(%r12),_TIF_UPROBE 275 jo .Lsysc_uprobe_notify 276#endif 277 tm __PT_FLAGS+7(%r11),_PIF_PER_TRAP 278 jo .Lsysc_singlestep 279 tm __TI_flags+7(%r12),_TIF_SIGPENDING 280 jo .Lsysc_sigpending 281 tm __TI_flags+7(%r12),_TIF_NOTIFY_RESUME 282 jo .Lsysc_notify_resume 283 tm __LC_CPU_FLAGS+7,_CIF_ASCE 284 jo .Lsysc_uaccess 285 j .Lsysc_return # beware of critical section cleanup 286 287# 288# _TIF_NEED_RESCHED is set, call schedule 289# 290.Lsysc_reschedule: 291 larl %r14,.Lsysc_return 292 jg schedule 293 294# 295# _CIF_MCCK_PENDING is set, call handler 296# 297.Lsysc_mcck_pending: 298 larl %r14,.Lsysc_return 299 jg s390_handle_mcck # TIF bit will be cleared by handler 300 301# 302# _CIF_ASCE is set, load user space asce 303# 304.Lsysc_uaccess: 305 ni __LC_CPU_FLAGS+7,255-_CIF_ASCE 306 lctlg %c1,%c1,__LC_USER_ASCE # load primary asce 307 j .Lsysc_return 308 309# 310# _TIF_SIGPENDING is set, call do_signal 311# 312.Lsysc_sigpending: 313 lgr %r2,%r11 # pass pointer to pt_regs 314 brasl %r14,do_signal 315 tm __PT_FLAGS+7(%r11),_PIF_SYSCALL 316 jno .Lsysc_return 317 lmg %r2,%r7,__PT_R2(%r11) # load svc arguments 318 lg %r10,__TI_sysc_table(%r12) # address of system call table 319 lghi %r8,0 # svc 0 returns -ENOSYS 320 llgh %r1,__PT_INT_CODE+2(%r11) # load new svc number 321 cghi %r1,NR_syscalls 322 jnl .Lsysc_nr_ok # invalid svc number -> do svc 0 323 slag %r8,%r1,2 324 j .Lsysc_nr_ok # restart svc 325 326# 327# _TIF_NOTIFY_RESUME is set, call do_notify_resume 328# 329.Lsysc_notify_resume: 330 lgr %r2,%r11 # pass pointer to pt_regs 331 larl %r14,.Lsysc_return 332 jg do_notify_resume 333 334# 335# _TIF_UPROBE is set, call uprobe_notify_resume 336# 337#ifdef CONFIG_UPROBES 338.Lsysc_uprobe_notify: 339 lgr %r2,%r11 # pass pointer to pt_regs 340 larl %r14,.Lsysc_return 341 jg uprobe_notify_resume 342#endif 343 344# 345# _PIF_PER_TRAP is set, call do_per_trap 346# 347.Lsysc_singlestep: 348 ni __PT_FLAGS+7(%r11),255-_PIF_PER_TRAP 349 lgr %r2,%r11 # pass pointer to pt_regs 350 larl %r14,.Lsysc_return 351 jg do_per_trap 352 353# 354# call tracehook_report_syscall_entry/tracehook_report_syscall_exit before 355# and after the system call 356# 357.Lsysc_tracesys: 358 lgr %r2,%r11 # pass pointer to pt_regs 359 la %r3,0 360 llgh %r0,__PT_INT_CODE+2(%r11) 361 stg %r0,__PT_R2(%r11) 362 brasl %r14,do_syscall_trace_enter 363 lghi %r0,NR_syscalls 364 clgr %r0,%r2 365 jnh .Lsysc_tracenogo 366 sllg %r8,%r2,2 367 lgf %r9,0(%r8,%r10) 368.Lsysc_tracego: 369 lmg %r3,%r7,__PT_R3(%r11) 370 stg %r7,STACK_FRAME_OVERHEAD(%r15) 371 lg %r2,__PT_ORIG_GPR2(%r11) 372 basr %r14,%r9 # call sys_xxx 373 stg %r2,__PT_R2(%r11) # store return value 374.Lsysc_tracenogo: 375 tm __TI_flags+7(%r12),_TIF_TRACE 376 jz .Lsysc_return 377 lgr %r2,%r11 # pass pointer to pt_regs 378 larl %r14,.Lsysc_return 379 jg do_syscall_trace_exit 380 381# 382# a new process exits the kernel with ret_from_fork 383# 384ENTRY(ret_from_fork) 385 la %r11,STACK_FRAME_OVERHEAD(%r15) 386 lg %r12,__LC_THREAD_INFO 387 brasl %r14,schedule_tail 388 TRACE_IRQS_ON 389 ssm __LC_SVC_NEW_PSW # reenable interrupts 390 tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ? 391 jne .Lsysc_tracenogo 392 # it's a kernel thread 393 lmg %r9,%r10,__PT_R9(%r11) # load gprs 394ENTRY(kernel_thread_starter) 395 la %r2,0(%r10) 396 basr %r14,%r9 397 j .Lsysc_tracenogo 398 399/* 400 * Program check handler routine 401 */ 402 403ENTRY(pgm_check_handler) 404 stpt __LC_SYNC_ENTER_TIMER 405 stmg %r8,%r15,__LC_SAVE_AREA_SYNC 406 lg %r10,__LC_LAST_BREAK 407 lg %r12,__LC_THREAD_INFO 408 larl %r13,system_call 409 lmg %r8,%r9,__LC_PGM_OLD_PSW 410 HANDLE_SIE_INTERCEPT %r14,1 411 tmhh %r8,0x0001 # test problem state bit 412 jnz 1f # -> fault in user space 413 tmhh %r8,0x4000 # PER bit set in old PSW ? 414 jnz 0f # -> enabled, can't be a double fault 415 tm __LC_PGM_ILC+3,0x80 # check for per exception 416 jnz .Lpgm_svcper # -> single stepped svc 4170: CHECK_STACK STACK_SIZE,__LC_SAVE_AREA_SYNC 418 aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) 419 j 2f 4201: UPDATE_VTIME %r14,__LC_SYNC_ENTER_TIMER 421 LAST_BREAK %r14 422 lg %r15,__LC_KERNEL_STACK 423 lg %r14,__TI_task(%r12) 424 aghi %r14,__TASK_thread # pointer to thread_struct 425 lghi %r13,__LC_PGM_TDB 426 tm __LC_PGM_ILC+2,0x02 # check for transaction abort 427 jz 2f 428 mvc __THREAD_trap_tdb(256,%r14),0(%r13) 4292: la %r11,STACK_FRAME_OVERHEAD(%r15) 430 stmg %r0,%r7,__PT_R0(%r11) 431 mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC 432 stmg %r8,%r9,__PT_PSW(%r11) 433 mvc __PT_INT_CODE(4,%r11),__LC_PGM_ILC 434 mvc __PT_INT_PARM_LONG(8,%r11),__LC_TRANS_EXC_CODE 435 xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11) 436 stg %r10,__PT_ARGS(%r11) 437 tm __LC_PGM_ILC+3,0x80 # check for per exception 438 jz 0f 439 tmhh %r8,0x0001 # kernel per event ? 440 jz .Lpgm_kprobe 441 oi __PT_FLAGS+7(%r11),_PIF_PER_TRAP 442 mvc __THREAD_per_address(8,%r14),__LC_PER_ADDRESS 443 mvc __THREAD_per_cause(2,%r14),__LC_PER_CODE 444 mvc __THREAD_per_paid(1,%r14),__LC_PER_ACCESS_ID 4450: REENABLE_IRQS 446 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) 447 larl %r1,pgm_check_table 448 llgh %r10,__PT_INT_CODE+2(%r11) 449 nill %r10,0x007f 450 sll %r10,2 451 je .Lsysc_return 452 lgf %r1,0(%r10,%r1) # load address of handler routine 453 lgr %r2,%r11 # pass pointer to pt_regs 454 basr %r14,%r1 # branch to interrupt-handler 455 j .Lsysc_return 456 457# 458# PER event in supervisor state, must be kprobes 459# 460.Lpgm_kprobe: 461 REENABLE_IRQS 462 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) 463 lgr %r2,%r11 # pass pointer to pt_regs 464 brasl %r14,do_per_trap 465 j .Lsysc_return 466 467# 468# single stepped system call 469# 470.Lpgm_svcper: 471 mvc __LC_RETURN_PSW(8),__LC_SVC_NEW_PSW 472 larl %r14,.Lsysc_per 473 stg %r14,__LC_RETURN_PSW+8 474 lghi %r14,_PIF_SYSCALL | _PIF_PER_TRAP 475 lpswe __LC_RETURN_PSW # branch to .Lsysc_per and enable irqs 476 477/* 478 * IO interrupt handler routine 479 */ 480ENTRY(io_int_handler) 481 STCK __LC_INT_CLOCK 482 stpt __LC_ASYNC_ENTER_TIMER 483 stmg %r8,%r15,__LC_SAVE_AREA_ASYNC 484 lg %r10,__LC_LAST_BREAK 485 lg %r12,__LC_THREAD_INFO 486 larl %r13,system_call 487 lmg %r8,%r9,__LC_IO_OLD_PSW 488 HANDLE_SIE_INTERCEPT %r14,2 489 SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT 490 tmhh %r8,0x0001 # interrupting from user? 491 jz .Lio_skip 492 UPDATE_VTIME %r14,__LC_ASYNC_ENTER_TIMER 493 LAST_BREAK %r14 494.Lio_skip: 495 stmg %r0,%r7,__PT_R0(%r11) 496 mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC 497 stmg %r8,%r9,__PT_PSW(%r11) 498 mvc __PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID 499 xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11) 500 TRACE_IRQS_OFF 501 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) 502.Lio_loop: 503 lgr %r2,%r11 # pass pointer to pt_regs 504 lghi %r3,IO_INTERRUPT 505 tm __PT_INT_CODE+8(%r11),0x80 # adapter interrupt ? 506 jz .Lio_call 507 lghi %r3,THIN_INTERRUPT 508.Lio_call: 509 brasl %r14,do_IRQ 510 tm __LC_MACHINE_FLAGS+6,0x10 # MACHINE_FLAG_LPAR 511 jz .Lio_return 512 tpi 0 513 jz .Lio_return 514 mvc __PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID 515 j .Lio_loop 516.Lio_return: 517 LOCKDEP_SYS_EXIT 518 TRACE_IRQS_ON 519.Lio_tif: 520 tm __TI_flags+7(%r12),_TIF_WORK 521 jnz .Lio_work # there is work to do (signals etc.) 522 tm __LC_CPU_FLAGS+7,_CIF_WORK 523 jnz .Lio_work 524.Lio_restore: 525 lg %r14,__LC_VDSO_PER_CPU 526 lmg %r0,%r10,__PT_R0(%r11) 527 mvc __LC_RETURN_PSW(16),__PT_PSW(%r11) 528 stpt __LC_EXIT_TIMER 529 mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER 530 lmg %r11,%r15,__PT_R11(%r11) 531 lpswe __LC_RETURN_PSW 532.Lio_done: 533 534# 535# There is work todo, find out in which context we have been interrupted: 536# 1) if we return to user space we can do all _TIF_WORK work 537# 2) if we return to kernel code and kvm is enabled check if we need to 538# modify the psw to leave SIE 539# 3) if we return to kernel code and preemptive scheduling is enabled check 540# the preemption counter and if it is zero call preempt_schedule_irq 541# Before any work can be done, a switch to the kernel stack is required. 542# 543.Lio_work: 544 tm __PT_PSW+1(%r11),0x01 # returning to user ? 545 jo .Lio_work_user # yes -> do resched & signal 546#ifdef CONFIG_PREEMPT 547 # check for preemptive scheduling 548 icm %r0,15,__TI_precount(%r12) 549 jnz .Lio_restore # preemption is disabled 550 tm __TI_flags+7(%r12),_TIF_NEED_RESCHED 551 jno .Lio_restore 552 # switch to kernel stack 553 lg %r1,__PT_R15(%r11) 554 aghi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE) 555 mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) 556 xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) 557 la %r11,STACK_FRAME_OVERHEAD(%r1) 558 lgr %r15,%r1 559 # TRACE_IRQS_ON already done at .Lio_return, call 560 # TRACE_IRQS_OFF to keep things symmetrical 561 TRACE_IRQS_OFF 562 brasl %r14,preempt_schedule_irq 563 j .Lio_return 564#else 565 j .Lio_restore 566#endif 567 568# 569# Need to do work before returning to userspace, switch to kernel stack 570# 571.Lio_work_user: 572 lg %r1,__LC_KERNEL_STACK 573 mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) 574 xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) 575 la %r11,STACK_FRAME_OVERHEAD(%r1) 576 lgr %r15,%r1 577 578# 579# One of the work bits is on. Find out which one. 580# 581.Lio_work_tif: 582 tm __LC_CPU_FLAGS+7,_CIF_MCCK_PENDING 583 jo .Lio_mcck_pending 584 tm __TI_flags+7(%r12),_TIF_NEED_RESCHED 585 jo .Lio_reschedule 586 tm __TI_flags+7(%r12),_TIF_SIGPENDING 587 jo .Lio_sigpending 588 tm __TI_flags+7(%r12),_TIF_NOTIFY_RESUME 589 jo .Lio_notify_resume 590 tm __LC_CPU_FLAGS+7,_CIF_ASCE 591 jo .Lio_uaccess 592 j .Lio_return # beware of critical section cleanup 593 594# 595# _CIF_MCCK_PENDING is set, call handler 596# 597.Lio_mcck_pending: 598 # TRACE_IRQS_ON already done at .Lio_return 599 brasl %r14,s390_handle_mcck # TIF bit will be cleared by handler 600 TRACE_IRQS_OFF 601 j .Lio_return 602 603# 604# _CIF_ASCE is set, load user space asce 605# 606.Lio_uaccess: 607 ni __LC_CPU_FLAGS+7,255-_CIF_ASCE 608 lctlg %c1,%c1,__LC_USER_ASCE # load primary asce 609 j .Lio_return 610 611# 612# _TIF_NEED_RESCHED is set, call schedule 613# 614.Lio_reschedule: 615 # TRACE_IRQS_ON already done at .Lio_return 616 ssm __LC_SVC_NEW_PSW # reenable interrupts 617 brasl %r14,schedule # call scheduler 618 ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts 619 TRACE_IRQS_OFF 620 j .Lio_return 621 622# 623# _TIF_SIGPENDING or is set, call do_signal 624# 625.Lio_sigpending: 626 # TRACE_IRQS_ON already done at .Lio_return 627 ssm __LC_SVC_NEW_PSW # reenable interrupts 628 lgr %r2,%r11 # pass pointer to pt_regs 629 brasl %r14,do_signal 630 ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts 631 TRACE_IRQS_OFF 632 j .Lio_return 633 634# 635# _TIF_NOTIFY_RESUME or is set, call do_notify_resume 636# 637.Lio_notify_resume: 638 # TRACE_IRQS_ON already done at .Lio_return 639 ssm __LC_SVC_NEW_PSW # reenable interrupts 640 lgr %r2,%r11 # pass pointer to pt_regs 641 brasl %r14,do_notify_resume 642 ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts 643 TRACE_IRQS_OFF 644 j .Lio_return 645 646/* 647 * External interrupt handler routine 648 */ 649ENTRY(ext_int_handler) 650 STCK __LC_INT_CLOCK 651 stpt __LC_ASYNC_ENTER_TIMER 652 stmg %r8,%r15,__LC_SAVE_AREA_ASYNC 653 lg %r10,__LC_LAST_BREAK 654 lg %r12,__LC_THREAD_INFO 655 larl %r13,system_call 656 lmg %r8,%r9,__LC_EXT_OLD_PSW 657 HANDLE_SIE_INTERCEPT %r14,3 658 SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT 659 tmhh %r8,0x0001 # interrupting from user ? 660 jz .Lext_skip 661 UPDATE_VTIME %r14,__LC_ASYNC_ENTER_TIMER 662 LAST_BREAK %r14 663.Lext_skip: 664 stmg %r0,%r7,__PT_R0(%r11) 665 mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC 666 stmg %r8,%r9,__PT_PSW(%r11) 667 lghi %r1,__LC_EXT_PARAMS2 668 mvc __PT_INT_CODE(4,%r11),__LC_EXT_CPU_ADDR 669 mvc __PT_INT_PARM(4,%r11),__LC_EXT_PARAMS 670 mvc __PT_INT_PARM_LONG(8,%r11),0(%r1) 671 xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11) 672 TRACE_IRQS_OFF 673 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) 674 lgr %r2,%r11 # pass pointer to pt_regs 675 lghi %r3,EXT_INTERRUPT 676 brasl %r14,do_IRQ 677 j .Lio_return 678 679/* 680 * Load idle PSW. The second "half" of this function is in .Lcleanup_idle. 681 */ 682ENTRY(psw_idle) 683 stg %r3,__SF_EMPTY(%r15) 684 larl %r1,.Lpsw_idle_lpsw+4 685 stg %r1,__SF_EMPTY+8(%r15) 686 STCK __CLOCK_IDLE_ENTER(%r2) 687 stpt __TIMER_IDLE_ENTER(%r2) 688.Lpsw_idle_lpsw: 689 lpswe __SF_EMPTY(%r15) 690 br %r14 691.Lpsw_idle_end: 692 693.L__critical_end: 694 695/* 696 * Machine check handler routines 697 */ 698ENTRY(mcck_int_handler) 699 STCK __LC_MCCK_CLOCK 700 la %r1,4095 # revalidate r1 701 spt __LC_CPU_TIMER_SAVE_AREA-4095(%r1) # revalidate cpu timer 702 lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs 703 lg %r10,__LC_LAST_BREAK 704 lg %r12,__LC_THREAD_INFO 705 larl %r13,system_call 706 lmg %r8,%r9,__LC_MCK_OLD_PSW 707 HANDLE_SIE_INTERCEPT %r14,4 708 tm __LC_MCCK_CODE,0x80 # system damage? 709 jo .Lmcck_panic # yes -> rest of mcck code invalid 710 lghi %r14,__LC_CPU_TIMER_SAVE_AREA 711 mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) 712 tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid? 713 jo 3f 714 la %r14,__LC_SYNC_ENTER_TIMER 715 clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER 716 jl 0f 717 la %r14,__LC_ASYNC_ENTER_TIMER 7180: clc 0(8,%r14),__LC_EXIT_TIMER 719 jl 1f 720 la %r14,__LC_EXIT_TIMER 7211: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER 722 jl 2f 723 la %r14,__LC_LAST_UPDATE_TIMER 7242: spt 0(%r14) 725 mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) 7263: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid? 727 jno .Lmcck_panic # no -> skip cleanup critical 728 SWITCH_ASYNC __LC_GPREGS_SAVE_AREA+64,__LC_PANIC_STACK,PAGE_SHIFT 729 tm %r8,0x0001 # interrupting from user ? 730 jz .Lmcck_skip 731 UPDATE_VTIME %r14,__LC_MCCK_ENTER_TIMER 732 LAST_BREAK %r14 733.Lmcck_skip: 734 lghi %r14,__LC_GPREGS_SAVE_AREA+64 735 stmg %r0,%r7,__PT_R0(%r11) 736 mvc __PT_R8(64,%r11),0(%r14) 737 stmg %r8,%r9,__PT_PSW(%r11) 738 xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11) 739 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) 740 lgr %r2,%r11 # pass pointer to pt_regs 741 brasl %r14,s390_do_machine_check 742 tm __PT_PSW+1(%r11),0x01 # returning to user ? 743 jno .Lmcck_return 744 lg %r1,__LC_KERNEL_STACK # switch to kernel stack 745 mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) 746 xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) 747 la %r11,STACK_FRAME_OVERHEAD(%r1) 748 lgr %r15,%r1 749 ssm __LC_PGM_NEW_PSW # turn dat on, keep irqs off 750 tm __LC_CPU_FLAGS+7,_CIF_MCCK_PENDING 751 jno .Lmcck_return 752 TRACE_IRQS_OFF 753 brasl %r14,s390_handle_mcck 754 TRACE_IRQS_ON 755.Lmcck_return: 756 lg %r14,__LC_VDSO_PER_CPU 757 lmg %r0,%r10,__PT_R0(%r11) 758 mvc __LC_RETURN_MCCK_PSW(16),__PT_PSW(%r11) # move return PSW 759 tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? 760 jno 0f 761 stpt __LC_EXIT_TIMER 762 mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER 7630: lmg %r11,%r15,__PT_R11(%r11) 764 lpswe __LC_RETURN_MCCK_PSW 765 766.Lmcck_panic: 767 lg %r14,__LC_PANIC_STACK 768 slgr %r14,%r15 769 srag %r14,%r14,PAGE_SHIFT 770 jz 0f 771 lg %r15,__LC_PANIC_STACK 7720: aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) 773 j .Lmcck_skip 774 775# 776# PSW restart interrupt handler 777# 778ENTRY(restart_int_handler) 779 stg %r15,__LC_SAVE_AREA_RESTART 780 lg %r15,__LC_RESTART_STACK 781 aghi %r15,-__PT_SIZE # create pt_regs on stack 782 xc 0(__PT_SIZE,%r15),0(%r15) 783 stmg %r0,%r14,__PT_R0(%r15) 784 mvc __PT_R15(8,%r15),__LC_SAVE_AREA_RESTART 785 mvc __PT_PSW(16,%r15),__LC_RST_OLD_PSW # store restart old psw 786 aghi %r15,-STACK_FRAME_OVERHEAD # create stack frame on stack 787 xc 0(STACK_FRAME_OVERHEAD,%r15),0(%r15) 788 lg %r1,__LC_RESTART_FN # load fn, parm & source cpu 789 lg %r2,__LC_RESTART_DATA 790 lg %r3,__LC_RESTART_SOURCE 791 ltgr %r3,%r3 # test source cpu address 792 jm 1f # negative -> skip source stop 7930: sigp %r4,%r3,SIGP_SENSE # sigp sense to source cpu 794 brc 10,0b # wait for status stored 7951: basr %r14,%r1 # call function 796 stap __SF_EMPTY(%r15) # store cpu address 797 llgh %r3,__SF_EMPTY(%r15) 7982: sigp %r4,%r3,SIGP_STOP # sigp stop to current cpu 799 brc 2,2b 8003: j 3b 801 802 .section .kprobes.text, "ax" 803 804#ifdef CONFIG_CHECK_STACK 805/* 806 * The synchronous or the asynchronous stack overflowed. We are dead. 807 * No need to properly save the registers, we are going to panic anyway. 808 * Setup a pt_regs so that show_trace can provide a good call trace. 809 */ 810stack_overflow: 811 lg %r15,__LC_PANIC_STACK # change to panic stack 812 la %r11,STACK_FRAME_OVERHEAD(%r15) 813 stmg %r0,%r7,__PT_R0(%r11) 814 stmg %r8,%r9,__PT_PSW(%r11) 815 mvc __PT_R8(64,%r11),0(%r14) 816 stg %r10,__PT_ORIG_GPR2(%r11) # store last break to orig_gpr2 817 xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) 818 lgr %r2,%r11 # pass pointer to pt_regs 819 jg kernel_stack_overflow 820#endif 821 822 .align 8 823.Lcleanup_table: 824 .quad system_call 825 .quad .Lsysc_do_svc 826 .quad .Lsysc_tif 827 .quad .Lsysc_restore 828 .quad .Lsysc_done 829 .quad .Lio_tif 830 .quad .Lio_restore 831 .quad .Lio_done 832 .quad psw_idle 833 .quad .Lpsw_idle_end 834 835cleanup_critical: 836 clg %r9,BASED(.Lcleanup_table) # system_call 837 jl 0f 838 clg %r9,BASED(.Lcleanup_table+8) # .Lsysc_do_svc 839 jl .Lcleanup_system_call 840 clg %r9,BASED(.Lcleanup_table+16) # .Lsysc_tif 841 jl 0f 842 clg %r9,BASED(.Lcleanup_table+24) # .Lsysc_restore 843 jl .Lcleanup_sysc_tif 844 clg %r9,BASED(.Lcleanup_table+32) # .Lsysc_done 845 jl .Lcleanup_sysc_restore 846 clg %r9,BASED(.Lcleanup_table+40) # .Lio_tif 847 jl 0f 848 clg %r9,BASED(.Lcleanup_table+48) # .Lio_restore 849 jl .Lcleanup_io_tif 850 clg %r9,BASED(.Lcleanup_table+56) # .Lio_done 851 jl .Lcleanup_io_restore 852 clg %r9,BASED(.Lcleanup_table+64) # psw_idle 853 jl 0f 854 clg %r9,BASED(.Lcleanup_table+72) # .Lpsw_idle_end 855 jl .Lcleanup_idle 8560: br %r14 857 858 859.Lcleanup_system_call: 860 # check if stpt has been executed 861 clg %r9,BASED(.Lcleanup_system_call_insn) 862 jh 0f 863 mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER 864 cghi %r11,__LC_SAVE_AREA_ASYNC 865 je 0f 866 mvc __LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER 8670: # check if stmg has been executed 868 clg %r9,BASED(.Lcleanup_system_call_insn+8) 869 jh 0f 870 mvc __LC_SAVE_AREA_SYNC(64),0(%r11) 8710: # check if base register setup + TIF bit load has been done 872 clg %r9,BASED(.Lcleanup_system_call_insn+16) 873 jhe 0f 874 # set up saved registers r10 and r12 875 stg %r10,16(%r11) # r10 last break 876 stg %r12,32(%r11) # r12 thread-info pointer 8770: # check if the user time update has been done 878 clg %r9,BASED(.Lcleanup_system_call_insn+24) 879 jh 0f 880 lg %r15,__LC_EXIT_TIMER 881 slg %r15,__LC_SYNC_ENTER_TIMER 882 alg %r15,__LC_USER_TIMER 883 stg %r15,__LC_USER_TIMER 8840: # check if the system time update has been done 885 clg %r9,BASED(.Lcleanup_system_call_insn+32) 886 jh 0f 887 lg %r15,__LC_LAST_UPDATE_TIMER 888 slg %r15,__LC_EXIT_TIMER 889 alg %r15,__LC_SYSTEM_TIMER 890 stg %r15,__LC_SYSTEM_TIMER 8910: # update accounting time stamp 892 mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 893 # do LAST_BREAK 894 lg %r9,16(%r11) 895 srag %r9,%r9,23 896 jz 0f 897 mvc __TI_last_break(8,%r12),16(%r11) 8980: # set up saved register r11 899 lg %r15,__LC_KERNEL_STACK 900 la %r9,STACK_FRAME_OVERHEAD(%r15) 901 stg %r9,24(%r11) # r11 pt_regs pointer 902 # fill pt_regs 903 mvc __PT_R8(64,%r9),__LC_SAVE_AREA_SYNC 904 stmg %r0,%r7,__PT_R0(%r9) 905 mvc __PT_PSW(16,%r9),__LC_SVC_OLD_PSW 906 mvc __PT_INT_CODE(4,%r9),__LC_SVC_ILC 907 xc __PT_FLAGS(8,%r9),__PT_FLAGS(%r9) 908 mvi __PT_FLAGS+7(%r9),_PIF_SYSCALL 909 # setup saved register r15 910 stg %r15,56(%r11) # r15 stack pointer 911 # set new psw address and exit 912 larl %r9,.Lsysc_do_svc 913 br %r14 914.Lcleanup_system_call_insn: 915 .quad system_call 916 .quad .Lsysc_stmg 917 .quad .Lsysc_per 918 .quad .Lsysc_vtime+18 919 .quad .Lsysc_vtime+42 920 921.Lcleanup_sysc_tif: 922 larl %r9,.Lsysc_tif 923 br %r14 924 925.Lcleanup_sysc_restore: 926 clg %r9,BASED(.Lcleanup_sysc_restore_insn) 927 je 0f 928 lg %r9,24(%r11) # get saved pointer to pt_regs 929 mvc __LC_RETURN_PSW(16),__PT_PSW(%r9) 930 mvc 0(64,%r11),__PT_R8(%r9) 931 lmg %r0,%r7,__PT_R0(%r9) 9320: lmg %r8,%r9,__LC_RETURN_PSW 933 br %r14 934.Lcleanup_sysc_restore_insn: 935 .quad .Lsysc_done - 4 936 937.Lcleanup_io_tif: 938 larl %r9,.Lio_tif 939 br %r14 940 941.Lcleanup_io_restore: 942 clg %r9,BASED(.Lcleanup_io_restore_insn) 943 je 0f 944 lg %r9,24(%r11) # get saved r11 pointer to pt_regs 945 mvc __LC_RETURN_PSW(16),__PT_PSW(%r9) 946 mvc 0(64,%r11),__PT_R8(%r9) 947 lmg %r0,%r7,__PT_R0(%r9) 9480: lmg %r8,%r9,__LC_RETURN_PSW 949 br %r14 950.Lcleanup_io_restore_insn: 951 .quad .Lio_done - 4 952 953.Lcleanup_idle: 954 # copy interrupt clock & cpu timer 955 mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_INT_CLOCK 956 mvc __TIMER_IDLE_EXIT(8,%r2),__LC_ASYNC_ENTER_TIMER 957 cghi %r11,__LC_SAVE_AREA_ASYNC 958 je 0f 959 mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_MCCK_CLOCK 960 mvc __TIMER_IDLE_EXIT(8,%r2),__LC_MCCK_ENTER_TIMER 9610: # check if stck & stpt have been executed 962 clg %r9,BASED(.Lcleanup_idle_insn) 963 jhe 1f 964 mvc __CLOCK_IDLE_ENTER(8,%r2),__CLOCK_IDLE_EXIT(%r2) 965 mvc __TIMER_IDLE_ENTER(8,%r2),__TIMER_IDLE_EXIT(%r2) 9661: # account system time going idle 967 lg %r9,__LC_STEAL_TIMER 968 alg %r9,__CLOCK_IDLE_ENTER(%r2) 969 slg %r9,__LC_LAST_UPDATE_CLOCK 970 stg %r9,__LC_STEAL_TIMER 971 mvc __LC_LAST_UPDATE_CLOCK(8),__CLOCK_IDLE_EXIT(%r2) 972 lg %r9,__LC_SYSTEM_TIMER 973 alg %r9,__LC_LAST_UPDATE_TIMER 974 slg %r9,__TIMER_IDLE_ENTER(%r2) 975 stg %r9,__LC_SYSTEM_TIMER 976 mvc __LC_LAST_UPDATE_TIMER(8),__TIMER_IDLE_EXIT(%r2) 977 # prepare return psw 978 nihh %r8,0xfcfd # clear irq & wait state bits 979 lg %r9,48(%r11) # return from psw_idle 980 br %r14 981.Lcleanup_idle_insn: 982 .quad .Lpsw_idle_lpsw 983 984/* 985 * Integer constants 986 */ 987 .align 8 988.Lcritical_start: 989 .quad .L__critical_start 990.Lcritical_length: 991 .quad .L__critical_end - .L__critical_start 992 993 994#if IS_ENABLED(CONFIG_KVM) 995/* 996 * sie64a calling convention: 997 * %r2 pointer to sie control block 998 * %r3 guest register save area 999 */ 1000ENTRY(sie64a) 1001 stmg %r6,%r14,__SF_GPRS(%r15) # save kernel registers 1002 stg %r2,__SF_EMPTY(%r15) # save control block pointer 1003 stg %r3,__SF_EMPTY+8(%r15) # save guest register save area 1004 xc __SF_EMPTY+16(16,%r15),__SF_EMPTY+16(%r15) # host id & reason 1005 lmg %r0,%r13,0(%r3) # load guest gprs 0-13 1006 lg %r14,__LC_GMAP # get gmap pointer 1007 ltgr %r14,%r14 1008 jz .Lsie_gmap 1009 lctlg %c1,%c1,__GMAP_ASCE(%r14) # load primary asce 1010.Lsie_gmap: 1011 lg %r14,__SF_EMPTY(%r15) # get control block pointer 1012 oi __SIE_PROG0C+3(%r14),1 # we are going into SIE now 1013 tm __SIE_PROG20+3(%r14),3 # last exit... 1014 jnz .Lsie_done 1015 LPP __SF_EMPTY(%r15) # set guest id 1016 sie 0(%r14) 1017.Lsie_done: 1018 LPP __SF_EMPTY+16(%r15) # set host id 1019 ni __SIE_PROG0C+3(%r14),0xfe # no longer in SIE 1020 lctlg %c1,%c1,__LC_USER_ASCE # load primary asce 1021# some program checks are suppressing. C code (e.g. do_protection_exception) 1022# will rewind the PSW by the ILC, which is 4 bytes in case of SIE. Other 1023# instructions between sie64a and .Lsie_done should not cause program 1024# interrupts. So lets use a nop (47 00 00 00) as a landing pad. 1025# See also HANDLE_SIE_INTERCEPT 1026.Lrewind_pad: 1027 nop 0 1028 .globl sie_exit 1029sie_exit: 1030 lg %r14,__SF_EMPTY+8(%r15) # load guest register save area 1031 stmg %r0,%r13,0(%r14) # save guest gprs 0-13 1032 lmg %r6,%r14,__SF_GPRS(%r15) # restore kernel registers 1033 lg %r2,__SF_EMPTY+24(%r15) # return exit reason code 1034 br %r14 1035.Lsie_fault: 1036 lghi %r14,-EFAULT 1037 stg %r14,__SF_EMPTY+24(%r15) # set exit reason code 1038 j sie_exit 1039 1040 .align 8 1041.Lsie_critical: 1042 .quad .Lsie_gmap 1043.Lsie_critical_length: 1044 .quad .Lsie_done - .Lsie_gmap 1045 1046 EX_TABLE(.Lrewind_pad,.Lsie_fault) 1047 EX_TABLE(sie_exit,.Lsie_fault) 1048#endif 1049 1050 .section .rodata, "a" 1051#define SYSCALL(esame,emu) .long esame 1052 .globl sys_call_table 1053sys_call_table: 1054#include "syscalls.S" 1055#undef SYSCALL 1056 1057#ifdef CONFIG_COMPAT 1058 1059#define SYSCALL(esame,emu) .long emu 1060 .globl sys_call_table_emu 1061sys_call_table_emu: 1062#include "syscalls.S" 1063#undef SYSCALL 1064#endif 1065