14bfc86ceSHeiko Carstens/* 24bfc86ceSHeiko Carstens * S390 low-level entry points. 34bfc86ceSHeiko Carstens * 44bfc86ceSHeiko Carstens * Copyright IBM Corp. 1999, 2012 54bfc86ceSHeiko Carstens * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), 64bfc86ceSHeiko Carstens * Hartmut Penner (hp@de.ibm.com), 74bfc86ceSHeiko Carstens * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com), 84bfc86ceSHeiko Carstens * Heiko Carstens <heiko.carstens@de.ibm.com> 94bfc86ceSHeiko Carstens */ 104bfc86ceSHeiko Carstens 114bfc86ceSHeiko Carstens#include <linux/init.h> 124bfc86ceSHeiko Carstens#include <linux/linkage.h> 134bfc86ceSHeiko Carstens#include <asm/processor.h> 144bfc86ceSHeiko Carstens#include <asm/cache.h> 154bfc86ceSHeiko Carstens#include <asm/errno.h> 164bfc86ceSHeiko Carstens#include <asm/ptrace.h> 174bfc86ceSHeiko Carstens#include <asm/thread_info.h> 184bfc86ceSHeiko Carstens#include <asm/asm-offsets.h> 194bfc86ceSHeiko Carstens#include <asm/unistd.h> 204bfc86ceSHeiko Carstens#include <asm/page.h> 214bfc86ceSHeiko Carstens#include <asm/sigp.h> 224bfc86ceSHeiko Carstens#include <asm/irq.h> 239977e886SHendrik Brueckner#include <asm/vx-insn.h> 2483abeffbSHendrik Brueckner#include <asm/setup.h> 2583abeffbSHendrik Brueckner#include <asm/nmi.h> 26711f5df7SAl Viro#include <asm/export.h> 274bfc86ceSHeiko Carstens 284bfc86ceSHeiko Carstens__PT_R0 = __PT_GPRS 294bfc86ceSHeiko Carstens__PT_R1 = __PT_GPRS + 8 304bfc86ceSHeiko Carstens__PT_R2 = __PT_GPRS + 16 314bfc86ceSHeiko Carstens__PT_R3 = __PT_GPRS + 24 324bfc86ceSHeiko Carstens__PT_R4 = __PT_GPRS + 32 334bfc86ceSHeiko Carstens__PT_R5 = __PT_GPRS + 40 344bfc86ceSHeiko Carstens__PT_R6 = __PT_GPRS + 48 354bfc86ceSHeiko Carstens__PT_R7 = __PT_GPRS + 56 364bfc86ceSHeiko Carstens__PT_R8 = __PT_GPRS + 64 374bfc86ceSHeiko Carstens__PT_R9 = __PT_GPRS + 72 384bfc86ceSHeiko Carstens__PT_R10 = __PT_GPRS + 80 394bfc86ceSHeiko Carstens__PT_R11 = __PT_GPRS + 88 404bfc86ceSHeiko Carstens__PT_R12 = __PT_GPRS + 96 414bfc86ceSHeiko Carstens__PT_R13 = __PT_GPRS + 104 424bfc86ceSHeiko Carstens__PT_R14 = __PT_GPRS + 112 434bfc86ceSHeiko Carstens__PT_R15 = __PT_GPRS + 120 444bfc86ceSHeiko Carstens 453a890380SHeiko CarstensSTACK_SHIFT = PAGE_SHIFT + THREAD_SIZE_ORDER 464bfc86ceSHeiko CarstensSTACK_SIZE = 1 << STACK_SHIFT 474bfc86ceSHeiko CarstensSTACK_INIT = STACK_SIZE - STACK_FRAME_OVERHEAD - __PT_SIZE 484bfc86ceSHeiko Carstens 494bfc86ceSHeiko Carstens_TIF_WORK = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ 504bfc86ceSHeiko Carstens _TIF_UPROBE) 514bfc86ceSHeiko Carstens_TIF_TRACE = (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \ 524bfc86ceSHeiko Carstens _TIF_SYSCALL_TRACEPOINT) 53*606aa4aaSHeiko Carstens_CIF_WORK = (_CIF_MCCK_PENDING | _CIF_ASCE_PRIMARY | _CIF_FPU) 544bfc86ceSHeiko Carstens_PIF_WORK = (_PIF_PER_TRAP) 554bfc86ceSHeiko Carstens 569977e886SHendrik Brueckner#define BASED(name) name-cleanup_critical(%r13) 574bfc86ceSHeiko Carstens 584bfc86ceSHeiko Carstens .macro TRACE_IRQS_ON 594bfc86ceSHeiko Carstens#ifdef CONFIG_TRACE_IRQFLAGS 604bfc86ceSHeiko Carstens basr %r2,%r0 614bfc86ceSHeiko Carstens brasl %r14,trace_hardirqs_on_caller 624bfc86ceSHeiko Carstens#endif 634bfc86ceSHeiko Carstens .endm 644bfc86ceSHeiko Carstens 654bfc86ceSHeiko Carstens .macro TRACE_IRQS_OFF 664bfc86ceSHeiko Carstens#ifdef CONFIG_TRACE_IRQFLAGS 674bfc86ceSHeiko Carstens basr %r2,%r0 684bfc86ceSHeiko Carstens brasl %r14,trace_hardirqs_off_caller 694bfc86ceSHeiko Carstens#endif 704bfc86ceSHeiko Carstens .endm 714bfc86ceSHeiko Carstens 724bfc86ceSHeiko Carstens .macro LOCKDEP_SYS_EXIT 734bfc86ceSHeiko Carstens#ifdef CONFIG_LOCKDEP 744bfc86ceSHeiko Carstens tm __PT_PSW+1(%r11),0x01 # returning to user ? 754bfc86ceSHeiko Carstens jz .+10 764bfc86ceSHeiko Carstens brasl %r14,lockdep_sys_exit 774bfc86ceSHeiko Carstens#endif 784bfc86ceSHeiko Carstens .endm 794bfc86ceSHeiko Carstens 804bfc86ceSHeiko Carstens .macro CHECK_STACK stacksize,savearea 814bfc86ceSHeiko Carstens#ifdef CONFIG_CHECK_STACK 824bfc86ceSHeiko Carstens tml %r15,\stacksize - CONFIG_STACK_GUARD 834bfc86ceSHeiko Carstens lghi %r14,\savearea 844bfc86ceSHeiko Carstens jz stack_overflow 854bfc86ceSHeiko Carstens#endif 864bfc86ceSHeiko Carstens .endm 874bfc86ceSHeiko Carstens 882acb94f4SMartin Schwidefsky .macro SWITCH_ASYNC savearea,timer 894bfc86ceSHeiko Carstens tmhh %r8,0x0001 # interrupting from user ? 904bfc86ceSHeiko Carstens jnz 1f 914bfc86ceSHeiko Carstens lgr %r14,%r9 924bfc86ceSHeiko Carstens slg %r14,BASED(.Lcritical_start) 934bfc86ceSHeiko Carstens clg %r14,BASED(.Lcritical_length) 944bfc86ceSHeiko Carstens jhe 0f 954bfc86ceSHeiko Carstens lghi %r11,\savearea # inside critical section, do cleanup 964bfc86ceSHeiko Carstens brasl %r14,cleanup_critical 974bfc86ceSHeiko Carstens tmhh %r8,0x0001 # retest problem state after cleanup 984bfc86ceSHeiko Carstens jnz 1f 992acb94f4SMartin Schwidefsky0: lg %r14,__LC_ASYNC_STACK # are we already on the async stack? 1004bfc86ceSHeiko Carstens slgr %r14,%r15 1012acb94f4SMartin Schwidefsky srag %r14,%r14,STACK_SHIFT 102a359bb11SMartin Schwidefsky jnz 2f 1032acb94f4SMartin Schwidefsky CHECK_STACK 1<<STACK_SHIFT,\savearea 1044bfc86ceSHeiko Carstens aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) 105a359bb11SMartin Schwidefsky j 3f 10634525e1fSMartin Schwidefsky1: UPDATE_VTIME %r14,%r15,\timer 1072acb94f4SMartin Schwidefsky2: lg %r15,__LC_ASYNC_STACK # load async stack 108a359bb11SMartin Schwidefsky3: la %r11,STACK_FRAME_OVERHEAD(%r15) 1094bfc86ceSHeiko Carstens .endm 1104bfc86ceSHeiko Carstens 111a359bb11SMartin Schwidefsky .macro UPDATE_VTIME w1,w2,enter_timer 112a359bb11SMartin Schwidefsky lg \w1,__LC_EXIT_TIMER 113a359bb11SMartin Schwidefsky lg \w2,__LC_LAST_UPDATE_TIMER 114a359bb11SMartin Schwidefsky slg \w1,\enter_timer 115a359bb11SMartin Schwidefsky slg \w2,__LC_EXIT_TIMER 116a359bb11SMartin Schwidefsky alg \w1,__LC_USER_TIMER 117a359bb11SMartin Schwidefsky alg \w2,__LC_SYSTEM_TIMER 118a359bb11SMartin Schwidefsky stg \w1,__LC_USER_TIMER 119a359bb11SMartin Schwidefsky stg \w2,__LC_SYSTEM_TIMER 1204bfc86ceSHeiko Carstens mvc __LC_LAST_UPDATE_TIMER(8),\enter_timer 1214bfc86ceSHeiko Carstens .endm 1224bfc86ceSHeiko Carstens 1234bfc86ceSHeiko Carstens .macro REENABLE_IRQS 1244bfc86ceSHeiko Carstens stg %r8,__LC_RETURN_PSW 1254bfc86ceSHeiko Carstens ni __LC_RETURN_PSW,0xbf 1264bfc86ceSHeiko Carstens ssm __LC_RETURN_PSW 1274bfc86ceSHeiko Carstens .endm 1284bfc86ceSHeiko Carstens 1294bfc86ceSHeiko Carstens .macro STCK savearea 1304bfc86ceSHeiko Carstens#ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES 1314bfc86ceSHeiko Carstens .insn s,0xb27c0000,\savearea # store clock fast 1324bfc86ceSHeiko Carstens#else 1334bfc86ceSHeiko Carstens .insn s,0xb2050000,\savearea # store clock 1344bfc86ceSHeiko Carstens#endif 1354bfc86ceSHeiko Carstens .endm 1364bfc86ceSHeiko Carstens 13783abeffbSHendrik Brueckner /* 13883abeffbSHendrik Brueckner * The TSTMSK macro generates a test-under-mask instruction by 13983abeffbSHendrik Brueckner * calculating the memory offset for the specified mask value. 14083abeffbSHendrik Brueckner * Mask value can be any constant. The macro shifts the mask 14183abeffbSHendrik Brueckner * value to calculate the memory offset for the test-under-mask 14283abeffbSHendrik Brueckner * instruction. 14383abeffbSHendrik Brueckner */ 14483abeffbSHendrik Brueckner .macro TSTMSK addr, mask, size=8, bytepos=0 14583abeffbSHendrik Brueckner .if (\bytepos < \size) && (\mask >> 8) 14683abeffbSHendrik Brueckner .if (\mask & 0xff) 14783abeffbSHendrik Brueckner .error "Mask exceeds byte boundary" 14883abeffbSHendrik Brueckner .endif 14983abeffbSHendrik Brueckner TSTMSK \addr, "(\mask >> 8)", \size, "(\bytepos + 1)" 15083abeffbSHendrik Brueckner .exitm 15183abeffbSHendrik Brueckner .endif 15283abeffbSHendrik Brueckner .ifeq \mask 15383abeffbSHendrik Brueckner .error "Mask must not be zero" 15483abeffbSHendrik Brueckner .endif 15583abeffbSHendrik Brueckner off = \size - \bytepos - 1 15683abeffbSHendrik Brueckner tm off+\addr, \mask 15783abeffbSHendrik Brueckner .endm 15883abeffbSHendrik Brueckner 1594bfc86ceSHeiko Carstens .section .kprobes.text, "ax" 16046210c44SHeiko Carstens.Ldummy: 16146210c44SHeiko Carstens /* 16246210c44SHeiko Carstens * This nop exists only in order to avoid that __switch_to starts at 16346210c44SHeiko Carstens * the beginning of the kprobes text section. In that case we would 16446210c44SHeiko Carstens * have several symbols at the same address. E.g. objdump would take 16546210c44SHeiko Carstens * an arbitrary symbol name when disassembling this code. 16646210c44SHeiko Carstens * With the added nop in between the __switch_to symbol is unique 16746210c44SHeiko Carstens * again. 16846210c44SHeiko Carstens */ 16946210c44SHeiko Carstens nop 0 1704bfc86ceSHeiko Carstens 1714bfc86ceSHeiko Carstens/* 1724bfc86ceSHeiko Carstens * Scheduler resume function, called by switch_to 1734bfc86ceSHeiko Carstens * gpr2 = (task_struct *) prev 1744bfc86ceSHeiko Carstens * gpr3 = (task_struct *) next 1754bfc86ceSHeiko Carstens * Returns: 1764bfc86ceSHeiko Carstens * gpr2 = prev 1774bfc86ceSHeiko Carstens */ 1784bfc86ceSHeiko CarstensENTRY(__switch_to) 1794bfc86ceSHeiko Carstens stmg %r6,%r15,__SF_GPRS(%r15) # store gprs of prev task 1803827ec3dSMartin Schwidefsky lgr %r1,%r2 1813827ec3dSMartin Schwidefsky aghi %r1,__TASK_thread # thread_struct of prev task 182d5c352cdSHeiko Carstens lg %r5,__TASK_stack(%r3) # start of kernel stack of next 1833827ec3dSMartin Schwidefsky stg %r15,__THREAD_ksp(%r1) # store kernel stack of prev 1843827ec3dSMartin Schwidefsky lgr %r1,%r3 1853827ec3dSMartin Schwidefsky aghi %r1,__TASK_thread # thread_struct of next task 1864bfc86ceSHeiko Carstens lgr %r15,%r5 1874bfc86ceSHeiko Carstens aghi %r15,STACK_INIT # end of kernel stack of next 1884bfc86ceSHeiko Carstens stg %r3,__LC_CURRENT # store task struct of next 1894bfc86ceSHeiko Carstens stg %r15,__LC_KERNEL_STACK # store end of kernel stack 1903827ec3dSMartin Schwidefsky lg %r15,__THREAD_ksp(%r1) # load kernel stack of next 191b1685ab9SChristian Borntraeger /* c4 is used in guest detection: arch/s390/kernel/perf_cpum_sf.c */ 1924bfc86ceSHeiko Carstens lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4 193e22cf8caSChristian Borntraeger mvc __LC_CURRENT_PID(4,%r0),__TASK_pid(%r3) # store pid of next 1944bfc86ceSHeiko Carstens lmg %r6,%r15,__SF_GPRS(%r15) # load gprs of next task 195e22cf8caSChristian Borntraeger TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_LPP 196e22cf8caSChristian Borntraeger bzr %r14 197e22cf8caSChristian Borntraeger .insn s,0xb2800000,__LC_LPP # set program parameter 1984bfc86ceSHeiko Carstens br %r14 1994bfc86ceSHeiko Carstens 2004bfc86ceSHeiko Carstens.L__critical_start: 201d0fc4107SMartin Schwidefsky 202d0fc4107SMartin Schwidefsky#if IS_ENABLED(CONFIG_KVM) 203d0fc4107SMartin Schwidefsky/* 204d0fc4107SMartin Schwidefsky * sie64a calling convention: 205d0fc4107SMartin Schwidefsky * %r2 pointer to sie control block 206d0fc4107SMartin Schwidefsky * %r3 guest register save area 207d0fc4107SMartin Schwidefsky */ 208d0fc4107SMartin SchwidefskyENTRY(sie64a) 209d0fc4107SMartin Schwidefsky stmg %r6,%r14,__SF_GPRS(%r15) # save kernel registers 210d0fc4107SMartin Schwidefsky stg %r2,__SF_EMPTY(%r15) # save control block pointer 211d0fc4107SMartin Schwidefsky stg %r3,__SF_EMPTY+8(%r15) # save guest register save area 212e22cf8caSChristian Borntraeger xc __SF_EMPTY+16(8,%r15),__SF_EMPTY+16(%r15) # reason code = 0 21383abeffbSHendrik Brueckner TSTMSK __LC_CPU_FLAGS,_CIF_FPU # load guest fp/vx registers ? 214d0fc4107SMartin Schwidefsky jno .Lsie_load_guest_gprs 215d0fc4107SMartin Schwidefsky brasl %r14,load_fpu_regs # load guest fp/vx regs 216d0fc4107SMartin Schwidefsky.Lsie_load_guest_gprs: 217d0fc4107SMartin Schwidefsky lmg %r0,%r13,0(%r3) # load guest gprs 0-13 218d0fc4107SMartin Schwidefsky lg %r14,__LC_GMAP # get gmap pointer 219d0fc4107SMartin Schwidefsky ltgr %r14,%r14 220d0fc4107SMartin Schwidefsky jz .Lsie_gmap 221d0fc4107SMartin Schwidefsky lctlg %c1,%c1,__GMAP_ASCE(%r14) # load primary asce 222d0fc4107SMartin Schwidefsky.Lsie_gmap: 223d0fc4107SMartin Schwidefsky lg %r14,__SF_EMPTY(%r15) # get control block pointer 224d0fc4107SMartin Schwidefsky oi __SIE_PROG0C+3(%r14),1 # we are going into SIE now 225d0fc4107SMartin Schwidefsky tm __SIE_PROG20+3(%r14),3 # last exit... 226d0fc4107SMartin Schwidefsky jnz .Lsie_skip 22783abeffbSHendrik Brueckner TSTMSK __LC_CPU_FLAGS,_CIF_FPU 228d0fc4107SMartin Schwidefsky jo .Lsie_skip # exit if fp/vx regs changed 229d0fc4107SMartin Schwidefsky sie 0(%r14) 230d0fc4107SMartin Schwidefsky.Lsie_skip: 231d0fc4107SMartin Schwidefsky ni __SIE_PROG0C+3(%r14),0xfe # no longer in SIE 232d0fc4107SMartin Schwidefsky lctlg %c1,%c1,__LC_USER_ASCE # load primary asce 233d0fc4107SMartin Schwidefsky.Lsie_done: 234d0fc4107SMartin Schwidefsky# some program checks are suppressing. C code (e.g. do_protection_exception) 235d0fc4107SMartin Schwidefsky# will rewind the PSW by the ILC, which is 4 bytes in case of SIE. Other 236d0fc4107SMartin Schwidefsky# instructions between sie64a and .Lsie_done should not cause program 237d0fc4107SMartin Schwidefsky# interrupts. So lets use a nop (47 00 00 00) as a landing pad. 238d0fc4107SMartin Schwidefsky# See also .Lcleanup_sie 239d0fc4107SMartin Schwidefsky.Lrewind_pad: 240d0fc4107SMartin Schwidefsky nop 0 241d0fc4107SMartin Schwidefsky .globl sie_exit 242d0fc4107SMartin Schwidefskysie_exit: 243d0fc4107SMartin Schwidefsky lg %r14,__SF_EMPTY+8(%r15) # load guest register save area 244d0fc4107SMartin Schwidefsky stmg %r0,%r13,0(%r14) # save guest gprs 0-13 245d0fc4107SMartin Schwidefsky lmg %r6,%r14,__SF_GPRS(%r15) # restore kernel registers 246e22cf8caSChristian Borntraeger lg %r2,__SF_EMPTY+16(%r15) # return exit reason code 247d0fc4107SMartin Schwidefsky br %r14 248d0fc4107SMartin Schwidefsky.Lsie_fault: 249d0fc4107SMartin Schwidefsky lghi %r14,-EFAULT 250e22cf8caSChristian Borntraeger stg %r14,__SF_EMPTY+16(%r15) # set exit reason code 251d0fc4107SMartin Schwidefsky j sie_exit 252d0fc4107SMartin Schwidefsky 253d0fc4107SMartin Schwidefsky EX_TABLE(.Lrewind_pad,.Lsie_fault) 254d0fc4107SMartin Schwidefsky EX_TABLE(sie_exit,.Lsie_fault) 255711f5df7SAl ViroEXPORT_SYMBOL(sie64a) 256711f5df7SAl ViroEXPORT_SYMBOL(sie_exit) 257d0fc4107SMartin Schwidefsky#endif 258d0fc4107SMartin Schwidefsky 2594bfc86ceSHeiko Carstens/* 2604bfc86ceSHeiko Carstens * SVC interrupt handler routine. System calls are synchronous events and 2614bfc86ceSHeiko Carstens * are executed with interrupts enabled. 2624bfc86ceSHeiko Carstens */ 2634bfc86ceSHeiko Carstens 2644bfc86ceSHeiko CarstensENTRY(system_call) 2654bfc86ceSHeiko Carstens stpt __LC_SYNC_ENTER_TIMER 2664bfc86ceSHeiko Carstens.Lsysc_stmg: 2674bfc86ceSHeiko Carstens stmg %r8,%r15,__LC_SAVE_AREA_SYNC 268d5c352cdSHeiko Carstens lg %r12,__LC_CURRENT 26934525e1fSMartin Schwidefsky lghi %r13,__TASK_thread 2704bfc86ceSHeiko Carstens lghi %r14,_PIF_SYSCALL 2714bfc86ceSHeiko Carstens.Lsysc_per: 2724bfc86ceSHeiko Carstens lg %r15,__LC_KERNEL_STACK 2734bfc86ceSHeiko Carstens la %r11,STACK_FRAME_OVERHEAD(%r15) # pointer to pt_regs 274a359bb11SMartin Schwidefsky.Lsysc_vtime: 27534525e1fSMartin Schwidefsky UPDATE_VTIME %r8,%r9,__LC_SYNC_ENTER_TIMER 2764bfc86ceSHeiko Carstens stmg %r0,%r7,__PT_R0(%r11) 2774bfc86ceSHeiko Carstens mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC 2784bfc86ceSHeiko Carstens mvc __PT_PSW(16,%r11),__LC_SVC_OLD_PSW 2794bfc86ceSHeiko Carstens mvc __PT_INT_CODE(4,%r11),__LC_SVC_ILC 2804bfc86ceSHeiko Carstens stg %r14,__PT_FLAGS(%r11) 2814bfc86ceSHeiko Carstens.Lsysc_do_svc: 282ef280c85SMartin Schwidefsky # load address of system call table 283ef280c85SMartin Schwidefsky lg %r10,__THREAD_sysc_table(%r13,%r12) 2844bfc86ceSHeiko Carstens llgh %r8,__PT_INT_CODE+2(%r11) 2854bfc86ceSHeiko Carstens slag %r8,%r8,2 # shift and test for svc 0 2864bfc86ceSHeiko Carstens jnz .Lsysc_nr_ok 2874bfc86ceSHeiko Carstens # svc 0: system call number in %r1 2884bfc86ceSHeiko Carstens llgfr %r1,%r1 # clear high word in r1 2894bfc86ceSHeiko Carstens cghi %r1,NR_syscalls 2904bfc86ceSHeiko Carstens jnl .Lsysc_nr_ok 2914bfc86ceSHeiko Carstens sth %r1,__PT_INT_CODE+2(%r11) 2924bfc86ceSHeiko Carstens slag %r8,%r1,2 2934bfc86ceSHeiko Carstens.Lsysc_nr_ok: 2944bfc86ceSHeiko Carstens xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) 2954bfc86ceSHeiko Carstens stg %r2,__PT_ORIG_GPR2(%r11) 2964bfc86ceSHeiko Carstens stg %r7,STACK_FRAME_OVERHEAD(%r15) 2974bfc86ceSHeiko Carstens lgf %r9,0(%r8,%r10) # get system call add. 29883abeffbSHendrik Brueckner TSTMSK __TI_flags(%r12),_TIF_TRACE 2994bfc86ceSHeiko Carstens jnz .Lsysc_tracesys 3004bfc86ceSHeiko Carstens basr %r14,%r9 # call sys_xxxx 3014bfc86ceSHeiko Carstens stg %r2,__PT_R2(%r11) # store return value 3024bfc86ceSHeiko Carstens 3034bfc86ceSHeiko Carstens.Lsysc_return: 3044bfc86ceSHeiko Carstens LOCKDEP_SYS_EXIT 3054bfc86ceSHeiko Carstens.Lsysc_tif: 30683abeffbSHendrik Brueckner TSTMSK __PT_FLAGS(%r11),_PIF_WORK 3074bfc86ceSHeiko Carstens jnz .Lsysc_work 30883abeffbSHendrik Brueckner TSTMSK __TI_flags(%r12),_TIF_WORK 3094bfc86ceSHeiko Carstens jnz .Lsysc_work # check for work 31083abeffbSHendrik Brueckner TSTMSK __LC_CPU_FLAGS,_CIF_WORK 3114bfc86ceSHeiko Carstens jnz .Lsysc_work 3124bfc86ceSHeiko Carstens.Lsysc_restore: 3134bfc86ceSHeiko Carstens lg %r14,__LC_VDSO_PER_CPU 3144bfc86ceSHeiko Carstens lmg %r0,%r10,__PT_R0(%r11) 3154bfc86ceSHeiko Carstens mvc __LC_RETURN_PSW(16),__PT_PSW(%r11) 3164bfc86ceSHeiko Carstens stpt __LC_EXIT_TIMER 3174bfc86ceSHeiko Carstens mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER 3184bfc86ceSHeiko Carstens lmg %r11,%r15,__PT_R11(%r11) 3194bfc86ceSHeiko Carstens lpswe __LC_RETURN_PSW 3204bfc86ceSHeiko Carstens.Lsysc_done: 3214bfc86ceSHeiko Carstens 3224bfc86ceSHeiko Carstens# 3234bfc86ceSHeiko Carstens# One of the work bits is on. Find out which one. 3244bfc86ceSHeiko Carstens# 3254bfc86ceSHeiko Carstens.Lsysc_work: 32683abeffbSHendrik Brueckner TSTMSK __LC_CPU_FLAGS,_CIF_MCCK_PENDING 3274bfc86ceSHeiko Carstens jo .Lsysc_mcck_pending 32883abeffbSHendrik Brueckner TSTMSK __TI_flags(%r12),_TIF_NEED_RESCHED 3294bfc86ceSHeiko Carstens jo .Lsysc_reschedule 3304bfc86ceSHeiko Carstens#ifdef CONFIG_UPROBES 33183abeffbSHendrik Brueckner TSTMSK __TI_flags(%r12),_TIF_UPROBE 3324bfc86ceSHeiko Carstens jo .Lsysc_uprobe_notify 3334bfc86ceSHeiko Carstens#endif 33483abeffbSHendrik Brueckner TSTMSK __PT_FLAGS(%r11),_PIF_PER_TRAP 3354bfc86ceSHeiko Carstens jo .Lsysc_singlestep 33683abeffbSHendrik Brueckner TSTMSK __TI_flags(%r12),_TIF_SIGPENDING 3374bfc86ceSHeiko Carstens jo .Lsysc_sigpending 33883abeffbSHendrik Brueckner TSTMSK __TI_flags(%r12),_TIF_NOTIFY_RESUME 3394bfc86ceSHeiko Carstens jo .Lsysc_notify_resume 34083abeffbSHendrik Brueckner TSTMSK __LC_CPU_FLAGS,_CIF_FPU 3419977e886SHendrik Brueckner jo .Lsysc_vxrs 342*606aa4aaSHeiko Carstens TSTMSK __LC_CPU_FLAGS,_CIF_ASCE_PRIMARY 343*606aa4aaSHeiko Carstens jo .Lsysc_asce_primary 3444bfc86ceSHeiko Carstens j .Lsysc_return # beware of critical section cleanup 3454bfc86ceSHeiko Carstens 3464bfc86ceSHeiko Carstens# 3474bfc86ceSHeiko Carstens# _TIF_NEED_RESCHED is set, call schedule 3484bfc86ceSHeiko Carstens# 3494bfc86ceSHeiko Carstens.Lsysc_reschedule: 3504bfc86ceSHeiko Carstens larl %r14,.Lsysc_return 3514bfc86ceSHeiko Carstens jg schedule 3524bfc86ceSHeiko Carstens 3534bfc86ceSHeiko Carstens# 3544bfc86ceSHeiko Carstens# _CIF_MCCK_PENDING is set, call handler 3554bfc86ceSHeiko Carstens# 3564bfc86ceSHeiko Carstens.Lsysc_mcck_pending: 3574bfc86ceSHeiko Carstens larl %r14,.Lsysc_return 3584bfc86ceSHeiko Carstens jg s390_handle_mcck # TIF bit will be cleared by handler 3594bfc86ceSHeiko Carstens 3604bfc86ceSHeiko Carstens# 361*606aa4aaSHeiko Carstens# _CIF_ASCE_PRIMARY is set, load user space asce 3624bfc86ceSHeiko Carstens# 363*606aa4aaSHeiko Carstens.Lsysc_asce_primary: 364*606aa4aaSHeiko Carstens ni __LC_CPU_FLAGS+7,255-_CIF_ASCE_PRIMARY 3654bfc86ceSHeiko Carstens lctlg %c1,%c1,__LC_USER_ASCE # load primary asce 3664bfc86ceSHeiko Carstens j .Lsysc_return 3674bfc86ceSHeiko Carstens 3684bfc86ceSHeiko Carstens# 3699977e886SHendrik Brueckner# CIF_FPU is set, restore floating-point controls and floating-point registers. 3709977e886SHendrik Brueckner# 3719977e886SHendrik Brueckner.Lsysc_vxrs: 3729977e886SHendrik Brueckner larl %r14,.Lsysc_return 3739977e886SHendrik Brueckner jg load_fpu_regs 3749977e886SHendrik Brueckner 3759977e886SHendrik Brueckner# 3764bfc86ceSHeiko Carstens# _TIF_SIGPENDING is set, call do_signal 3774bfc86ceSHeiko Carstens# 3784bfc86ceSHeiko Carstens.Lsysc_sigpending: 3794bfc86ceSHeiko Carstens lgr %r2,%r11 # pass pointer to pt_regs 3804bfc86ceSHeiko Carstens brasl %r14,do_signal 38183abeffbSHendrik Brueckner TSTMSK __PT_FLAGS(%r11),_PIF_SYSCALL 3824bfc86ceSHeiko Carstens jno .Lsysc_return 38357d7f939SMartin Schwidefsky.Lsysc_do_syscall: 38457d7f939SMartin Schwidefsky lghi %r13,__TASK_thread 3854bfc86ceSHeiko Carstens lmg %r2,%r7,__PT_R2(%r11) # load svc arguments 38657d7f939SMartin Schwidefsky lghi %r1,0 # svc 0 returns -ENOSYS 38757d7f939SMartin Schwidefsky j .Lsysc_do_svc 3884bfc86ceSHeiko Carstens 3894bfc86ceSHeiko Carstens# 3904bfc86ceSHeiko Carstens# _TIF_NOTIFY_RESUME is set, call do_notify_resume 3914bfc86ceSHeiko Carstens# 3924bfc86ceSHeiko Carstens.Lsysc_notify_resume: 3934bfc86ceSHeiko Carstens lgr %r2,%r11 # pass pointer to pt_regs 3944bfc86ceSHeiko Carstens larl %r14,.Lsysc_return 3954bfc86ceSHeiko Carstens jg do_notify_resume 3964bfc86ceSHeiko Carstens 3974bfc86ceSHeiko Carstens# 3984bfc86ceSHeiko Carstens# _TIF_UPROBE is set, call uprobe_notify_resume 3994bfc86ceSHeiko Carstens# 4004bfc86ceSHeiko Carstens#ifdef CONFIG_UPROBES 4014bfc86ceSHeiko Carstens.Lsysc_uprobe_notify: 4024bfc86ceSHeiko Carstens lgr %r2,%r11 # pass pointer to pt_regs 4034bfc86ceSHeiko Carstens larl %r14,.Lsysc_return 4044bfc86ceSHeiko Carstens jg uprobe_notify_resume 4054bfc86ceSHeiko Carstens#endif 4064bfc86ceSHeiko Carstens 4074bfc86ceSHeiko Carstens# 4084bfc86ceSHeiko Carstens# _PIF_PER_TRAP is set, call do_per_trap 4094bfc86ceSHeiko Carstens# 4104bfc86ceSHeiko Carstens.Lsysc_singlestep: 4114bfc86ceSHeiko Carstens ni __PT_FLAGS+7(%r11),255-_PIF_PER_TRAP 4124bfc86ceSHeiko Carstens lgr %r2,%r11 # pass pointer to pt_regs 4134bfc86ceSHeiko Carstens larl %r14,.Lsysc_return 4144bfc86ceSHeiko Carstens jg do_per_trap 4154bfc86ceSHeiko Carstens 4164bfc86ceSHeiko Carstens# 4174bfc86ceSHeiko Carstens# call tracehook_report_syscall_entry/tracehook_report_syscall_exit before 4184bfc86ceSHeiko Carstens# and after the system call 4194bfc86ceSHeiko Carstens# 4204bfc86ceSHeiko Carstens.Lsysc_tracesys: 4214bfc86ceSHeiko Carstens lgr %r2,%r11 # pass pointer to pt_regs 4224bfc86ceSHeiko Carstens la %r3,0 4234bfc86ceSHeiko Carstens llgh %r0,__PT_INT_CODE+2(%r11) 4244bfc86ceSHeiko Carstens stg %r0,__PT_R2(%r11) 4254bfc86ceSHeiko Carstens brasl %r14,do_syscall_trace_enter 4264bfc86ceSHeiko Carstens lghi %r0,NR_syscalls 4274bfc86ceSHeiko Carstens clgr %r0,%r2 4284bfc86ceSHeiko Carstens jnh .Lsysc_tracenogo 4294bfc86ceSHeiko Carstens sllg %r8,%r2,2 4304bfc86ceSHeiko Carstens lgf %r9,0(%r8,%r10) 4314bfc86ceSHeiko Carstens.Lsysc_tracego: 4324bfc86ceSHeiko Carstens lmg %r3,%r7,__PT_R3(%r11) 4334bfc86ceSHeiko Carstens stg %r7,STACK_FRAME_OVERHEAD(%r15) 4344bfc86ceSHeiko Carstens lg %r2,__PT_ORIG_GPR2(%r11) 4354bfc86ceSHeiko Carstens basr %r14,%r9 # call sys_xxx 4364bfc86ceSHeiko Carstens stg %r2,__PT_R2(%r11) # store return value 4374bfc86ceSHeiko Carstens.Lsysc_tracenogo: 43883abeffbSHendrik Brueckner TSTMSK __TI_flags(%r12),_TIF_TRACE 4394bfc86ceSHeiko Carstens jz .Lsysc_return 4404bfc86ceSHeiko Carstens lgr %r2,%r11 # pass pointer to pt_regs 4414bfc86ceSHeiko Carstens larl %r14,.Lsysc_return 4424bfc86ceSHeiko Carstens jg do_syscall_trace_exit 4434bfc86ceSHeiko Carstens 4444bfc86ceSHeiko Carstens# 4454bfc86ceSHeiko Carstens# a new process exits the kernel with ret_from_fork 4464bfc86ceSHeiko Carstens# 4474bfc86ceSHeiko CarstensENTRY(ret_from_fork) 4484bfc86ceSHeiko Carstens la %r11,STACK_FRAME_OVERHEAD(%r15) 449d5c352cdSHeiko Carstens lg %r12,__LC_CURRENT 4504bfc86ceSHeiko Carstens brasl %r14,schedule_tail 4514bfc86ceSHeiko Carstens TRACE_IRQS_ON 4524bfc86ceSHeiko Carstens ssm __LC_SVC_NEW_PSW # reenable interrupts 4534bfc86ceSHeiko Carstens tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ? 4544bfc86ceSHeiko Carstens jne .Lsysc_tracenogo 4554bfc86ceSHeiko Carstens # it's a kernel thread 4564bfc86ceSHeiko Carstens lmg %r9,%r10,__PT_R9(%r11) # load gprs 4574bfc86ceSHeiko CarstensENTRY(kernel_thread_starter) 4584bfc86ceSHeiko Carstens la %r2,0(%r10) 4594bfc86ceSHeiko Carstens basr %r14,%r9 4604bfc86ceSHeiko Carstens j .Lsysc_tracenogo 4614bfc86ceSHeiko Carstens 4624bfc86ceSHeiko Carstens/* 4634bfc86ceSHeiko Carstens * Program check handler routine 4644bfc86ceSHeiko Carstens */ 4654bfc86ceSHeiko Carstens 4664bfc86ceSHeiko CarstensENTRY(pgm_check_handler) 4674bfc86ceSHeiko Carstens stpt __LC_SYNC_ENTER_TIMER 4684bfc86ceSHeiko Carstens stmg %r8,%r15,__LC_SAVE_AREA_SYNC 4694bfc86ceSHeiko Carstens lg %r10,__LC_LAST_BREAK 470d5c352cdSHeiko Carstens lg %r12,__LC_CURRENT 4719977e886SHendrik Brueckner larl %r13,cleanup_critical 4724bfc86ceSHeiko Carstens lmg %r8,%r9,__LC_PGM_OLD_PSW 4734bfc86ceSHeiko Carstens tmhh %r8,0x0001 # test problem state bit 474d0fc4107SMartin Schwidefsky jnz 2f # -> fault in user space 475d0fc4107SMartin Schwidefsky#if IS_ENABLED(CONFIG_KVM) 476d0fc4107SMartin Schwidefsky # cleanup critical section for sie64a 477d0fc4107SMartin Schwidefsky lgr %r14,%r9 478d0fc4107SMartin Schwidefsky slg %r14,BASED(.Lsie_critical_start) 479d0fc4107SMartin Schwidefsky clg %r14,BASED(.Lsie_critical_length) 480d0fc4107SMartin Schwidefsky jhe 0f 481d0fc4107SMartin Schwidefsky brasl %r14,.Lcleanup_sie 482d0fc4107SMartin Schwidefsky#endif 483d0fc4107SMartin Schwidefsky0: tmhh %r8,0x4000 # PER bit set in old PSW ? 484d0fc4107SMartin Schwidefsky jnz 1f # -> enabled, can't be a double fault 4854bfc86ceSHeiko Carstens tm __LC_PGM_ILC+3,0x80 # check for per exception 4864bfc86ceSHeiko Carstens jnz .Lpgm_svcper # -> single stepped svc 487d0fc4107SMartin Schwidefsky1: CHECK_STACK STACK_SIZE,__LC_SAVE_AREA_SYNC 4884bfc86ceSHeiko Carstens aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) 489d0fc4107SMartin Schwidefsky j 3f 49034525e1fSMartin Schwidefsky2: UPDATE_VTIME %r14,%r15,__LC_SYNC_ENTER_TIMER 4914bfc86ceSHeiko Carstens lg %r15,__LC_KERNEL_STACK 492d5c352cdSHeiko Carstens lgr %r14,%r12 4933827ec3dSMartin Schwidefsky aghi %r14,__TASK_thread # pointer to thread_struct 4944bfc86ceSHeiko Carstens lghi %r13,__LC_PGM_TDB 4954bfc86ceSHeiko Carstens tm __LC_PGM_ILC+2,0x02 # check for transaction abort 496d0fc4107SMartin Schwidefsky jz 3f 4974bfc86ceSHeiko Carstens mvc __THREAD_trap_tdb(256,%r14),0(%r13) 498d0fc4107SMartin Schwidefsky3: la %r11,STACK_FRAME_OVERHEAD(%r15) 49934525e1fSMartin Schwidefsky stg %r10,__THREAD_last_break(%r14) 5004bfc86ceSHeiko Carstens stmg %r0,%r7,__PT_R0(%r11) 5014bfc86ceSHeiko Carstens mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC 5024bfc86ceSHeiko Carstens stmg %r8,%r9,__PT_PSW(%r11) 5034bfc86ceSHeiko Carstens mvc __PT_INT_CODE(4,%r11),__LC_PGM_ILC 5044bfc86ceSHeiko Carstens mvc __PT_INT_PARM_LONG(8,%r11),__LC_TRANS_EXC_CODE 5054bfc86ceSHeiko Carstens xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11) 5064bfc86ceSHeiko Carstens stg %r10,__PT_ARGS(%r11) 5074bfc86ceSHeiko Carstens tm __LC_PGM_ILC+3,0x80 # check for per exception 508d0fc4107SMartin Schwidefsky jz 4f 5094bfc86ceSHeiko Carstens tmhh %r8,0x0001 # kernel per event ? 5104bfc86ceSHeiko Carstens jz .Lpgm_kprobe 5114bfc86ceSHeiko Carstens oi __PT_FLAGS+7(%r11),_PIF_PER_TRAP 5124bfc86ceSHeiko Carstens mvc __THREAD_per_address(8,%r14),__LC_PER_ADDRESS 5134bfc86ceSHeiko Carstens mvc __THREAD_per_cause(2,%r14),__LC_PER_CODE 5144bfc86ceSHeiko Carstens mvc __THREAD_per_paid(1,%r14),__LC_PER_ACCESS_ID 515d0fc4107SMartin Schwidefsky4: REENABLE_IRQS 5164bfc86ceSHeiko Carstens xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) 5174bfc86ceSHeiko Carstens larl %r1,pgm_check_table 5184bfc86ceSHeiko Carstens llgh %r10,__PT_INT_CODE+2(%r11) 5194bfc86ceSHeiko Carstens nill %r10,0x007f 5204bfc86ceSHeiko Carstens sll %r10,2 521a359bb11SMartin Schwidefsky je .Lpgm_return 5224bfc86ceSHeiko Carstens lgf %r1,0(%r10,%r1) # load address of handler routine 5234bfc86ceSHeiko Carstens lgr %r2,%r11 # pass pointer to pt_regs 5244bfc86ceSHeiko Carstens basr %r14,%r1 # branch to interrupt-handler 525a359bb11SMartin Schwidefsky.Lpgm_return: 526a359bb11SMartin Schwidefsky LOCKDEP_SYS_EXIT 527a359bb11SMartin Schwidefsky tm __PT_PSW+1(%r11),0x01 # returning to user ? 528a359bb11SMartin Schwidefsky jno .Lsysc_restore 52957d7f939SMartin Schwidefsky TSTMSK __PT_FLAGS(%r11),_PIF_SYSCALL 53057d7f939SMartin Schwidefsky jo .Lsysc_do_syscall 531a359bb11SMartin Schwidefsky j .Lsysc_tif 5324bfc86ceSHeiko Carstens 5334bfc86ceSHeiko Carstens# 5344bfc86ceSHeiko Carstens# PER event in supervisor state, must be kprobes 5354bfc86ceSHeiko Carstens# 5364bfc86ceSHeiko Carstens.Lpgm_kprobe: 5374bfc86ceSHeiko Carstens REENABLE_IRQS 5384bfc86ceSHeiko Carstens xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) 5394bfc86ceSHeiko Carstens lgr %r2,%r11 # pass pointer to pt_regs 5404bfc86ceSHeiko Carstens brasl %r14,do_per_trap 541a359bb11SMartin Schwidefsky j .Lpgm_return 5424bfc86ceSHeiko Carstens 5434bfc86ceSHeiko Carstens# 5444bfc86ceSHeiko Carstens# single stepped system call 5454bfc86ceSHeiko Carstens# 5464bfc86ceSHeiko Carstens.Lpgm_svcper: 5474bfc86ceSHeiko Carstens mvc __LC_RETURN_PSW(8),__LC_SVC_NEW_PSW 548d24b98e3SMartin Schwidefsky lghi %r13,__TASK_thread 5494bfc86ceSHeiko Carstens larl %r14,.Lsysc_per 5504bfc86ceSHeiko Carstens stg %r14,__LC_RETURN_PSW+8 5514bfc86ceSHeiko Carstens lghi %r14,_PIF_SYSCALL | _PIF_PER_TRAP 5524bfc86ceSHeiko Carstens lpswe __LC_RETURN_PSW # branch to .Lsysc_per and enable irqs 5534bfc86ceSHeiko Carstens 5544bfc86ceSHeiko Carstens/* 5554bfc86ceSHeiko Carstens * IO interrupt handler routine 5564bfc86ceSHeiko Carstens */ 5574bfc86ceSHeiko CarstensENTRY(io_int_handler) 5584bfc86ceSHeiko Carstens STCK __LC_INT_CLOCK 5594bfc86ceSHeiko Carstens stpt __LC_ASYNC_ENTER_TIMER 5604bfc86ceSHeiko Carstens stmg %r8,%r15,__LC_SAVE_AREA_ASYNC 561d5c352cdSHeiko Carstens lg %r12,__LC_CURRENT 5629977e886SHendrik Brueckner larl %r13,cleanup_critical 5634bfc86ceSHeiko Carstens lmg %r8,%r9,__LC_IO_OLD_PSW 5642acb94f4SMartin Schwidefsky SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_ENTER_TIMER 5654bfc86ceSHeiko Carstens stmg %r0,%r7,__PT_R0(%r11) 5664bfc86ceSHeiko Carstens mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC 5674bfc86ceSHeiko Carstens stmg %r8,%r9,__PT_PSW(%r11) 5684bfc86ceSHeiko Carstens mvc __PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID 5694bfc86ceSHeiko Carstens xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11) 570db7e007fSHeiko Carstens TSTMSK __LC_CPU_FLAGS,_CIF_IGNORE_IRQ 571db7e007fSHeiko Carstens jo .Lio_restore 5724bfc86ceSHeiko Carstens TRACE_IRQS_OFF 5734bfc86ceSHeiko Carstens xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) 5744bfc86ceSHeiko Carstens.Lio_loop: 5754bfc86ceSHeiko Carstens lgr %r2,%r11 # pass pointer to pt_regs 5764bfc86ceSHeiko Carstens lghi %r3,IO_INTERRUPT 5774bfc86ceSHeiko Carstens tm __PT_INT_CODE+8(%r11),0x80 # adapter interrupt ? 5784bfc86ceSHeiko Carstens jz .Lio_call 5794bfc86ceSHeiko Carstens lghi %r3,THIN_INTERRUPT 5804bfc86ceSHeiko Carstens.Lio_call: 5814bfc86ceSHeiko Carstens brasl %r14,do_IRQ 58283abeffbSHendrik Brueckner TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_LPAR 5834bfc86ceSHeiko Carstens jz .Lio_return 5844bfc86ceSHeiko Carstens tpi 0 5854bfc86ceSHeiko Carstens jz .Lio_return 5864bfc86ceSHeiko Carstens mvc __PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID 5874bfc86ceSHeiko Carstens j .Lio_loop 5884bfc86ceSHeiko Carstens.Lio_return: 5894bfc86ceSHeiko Carstens LOCKDEP_SYS_EXIT 5904bfc86ceSHeiko Carstens TRACE_IRQS_ON 5914bfc86ceSHeiko Carstens.Lio_tif: 59283abeffbSHendrik Brueckner TSTMSK __TI_flags(%r12),_TIF_WORK 5934bfc86ceSHeiko Carstens jnz .Lio_work # there is work to do (signals etc.) 59483abeffbSHendrik Brueckner TSTMSK __LC_CPU_FLAGS,_CIF_WORK 5954bfc86ceSHeiko Carstens jnz .Lio_work 5964bfc86ceSHeiko Carstens.Lio_restore: 5974bfc86ceSHeiko Carstens lg %r14,__LC_VDSO_PER_CPU 5984bfc86ceSHeiko Carstens lmg %r0,%r10,__PT_R0(%r11) 5994bfc86ceSHeiko Carstens mvc __LC_RETURN_PSW(16),__PT_PSW(%r11) 6004bfc86ceSHeiko Carstens stpt __LC_EXIT_TIMER 6014bfc86ceSHeiko Carstens mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER 6024bfc86ceSHeiko Carstens lmg %r11,%r15,__PT_R11(%r11) 6034bfc86ceSHeiko Carstens lpswe __LC_RETURN_PSW 6044bfc86ceSHeiko Carstens.Lio_done: 6054bfc86ceSHeiko Carstens 6064bfc86ceSHeiko Carstens# 6074bfc86ceSHeiko Carstens# There is work todo, find out in which context we have been interrupted: 6084bfc86ceSHeiko Carstens# 1) if we return to user space we can do all _TIF_WORK work 6094bfc86ceSHeiko Carstens# 2) if we return to kernel code and kvm is enabled check if we need to 6104bfc86ceSHeiko Carstens# modify the psw to leave SIE 6114bfc86ceSHeiko Carstens# 3) if we return to kernel code and preemptive scheduling is enabled check 6124bfc86ceSHeiko Carstens# the preemption counter and if it is zero call preempt_schedule_irq 6134bfc86ceSHeiko Carstens# Before any work can be done, a switch to the kernel stack is required. 6144bfc86ceSHeiko Carstens# 6154bfc86ceSHeiko Carstens.Lio_work: 6164bfc86ceSHeiko Carstens tm __PT_PSW+1(%r11),0x01 # returning to user ? 6174bfc86ceSHeiko Carstens jo .Lio_work_user # yes -> do resched & signal 6184bfc86ceSHeiko Carstens#ifdef CONFIG_PREEMPT 6194bfc86ceSHeiko Carstens # check for preemptive scheduling 620c360192bSMartin Schwidefsky icm %r0,15,__LC_PREEMPT_COUNT 6214bfc86ceSHeiko Carstens jnz .Lio_restore # preemption is disabled 62283abeffbSHendrik Brueckner TSTMSK __TI_flags(%r12),_TIF_NEED_RESCHED 6234bfc86ceSHeiko Carstens jno .Lio_restore 6244bfc86ceSHeiko Carstens # switch to kernel stack 6254bfc86ceSHeiko Carstens lg %r1,__PT_R15(%r11) 6264bfc86ceSHeiko Carstens aghi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE) 6274bfc86ceSHeiko Carstens mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) 6284bfc86ceSHeiko Carstens xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) 6294bfc86ceSHeiko Carstens la %r11,STACK_FRAME_OVERHEAD(%r1) 6304bfc86ceSHeiko Carstens lgr %r15,%r1 6314bfc86ceSHeiko Carstens # TRACE_IRQS_ON already done at .Lio_return, call 6324bfc86ceSHeiko Carstens # TRACE_IRQS_OFF to keep things symmetrical 6334bfc86ceSHeiko Carstens TRACE_IRQS_OFF 6344bfc86ceSHeiko Carstens brasl %r14,preempt_schedule_irq 6354bfc86ceSHeiko Carstens j .Lio_return 6364bfc86ceSHeiko Carstens#else 6374bfc86ceSHeiko Carstens j .Lio_restore 6384bfc86ceSHeiko Carstens#endif 6394bfc86ceSHeiko Carstens 6404bfc86ceSHeiko Carstens# 6414bfc86ceSHeiko Carstens# Need to do work before returning to userspace, switch to kernel stack 6424bfc86ceSHeiko Carstens# 6434bfc86ceSHeiko Carstens.Lio_work_user: 6444bfc86ceSHeiko Carstens lg %r1,__LC_KERNEL_STACK 6454bfc86ceSHeiko Carstens mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) 6464bfc86ceSHeiko Carstens xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) 6474bfc86ceSHeiko Carstens la %r11,STACK_FRAME_OVERHEAD(%r1) 6484bfc86ceSHeiko Carstens lgr %r15,%r1 6494bfc86ceSHeiko Carstens 6504bfc86ceSHeiko Carstens# 6514bfc86ceSHeiko Carstens# One of the work bits is on. Find out which one. 6524bfc86ceSHeiko Carstens# 6534bfc86ceSHeiko Carstens.Lio_work_tif: 65483abeffbSHendrik Brueckner TSTMSK __LC_CPU_FLAGS,_CIF_MCCK_PENDING 6554bfc86ceSHeiko Carstens jo .Lio_mcck_pending 65683abeffbSHendrik Brueckner TSTMSK __TI_flags(%r12),_TIF_NEED_RESCHED 6574bfc86ceSHeiko Carstens jo .Lio_reschedule 65883abeffbSHendrik Brueckner TSTMSK __TI_flags(%r12),_TIF_SIGPENDING 6594bfc86ceSHeiko Carstens jo .Lio_sigpending 66083abeffbSHendrik Brueckner TSTMSK __TI_flags(%r12),_TIF_NOTIFY_RESUME 6614bfc86ceSHeiko Carstens jo .Lio_notify_resume 66283abeffbSHendrik Brueckner TSTMSK __LC_CPU_FLAGS,_CIF_FPU 6639977e886SHendrik Brueckner jo .Lio_vxrs 664*606aa4aaSHeiko Carstens TSTMSK __LC_CPU_FLAGS,_CIF_ASCE_PRIMARY 665*606aa4aaSHeiko Carstens jo .Lio_asce_primary 6664bfc86ceSHeiko Carstens j .Lio_return # beware of critical section cleanup 6674bfc86ceSHeiko Carstens 6684bfc86ceSHeiko Carstens# 6694bfc86ceSHeiko Carstens# _CIF_MCCK_PENDING is set, call handler 6704bfc86ceSHeiko Carstens# 6714bfc86ceSHeiko Carstens.Lio_mcck_pending: 6724bfc86ceSHeiko Carstens # TRACE_IRQS_ON already done at .Lio_return 6734bfc86ceSHeiko Carstens brasl %r14,s390_handle_mcck # TIF bit will be cleared by handler 6744bfc86ceSHeiko Carstens TRACE_IRQS_OFF 6754bfc86ceSHeiko Carstens j .Lio_return 6764bfc86ceSHeiko Carstens 6774bfc86ceSHeiko Carstens# 678*606aa4aaSHeiko Carstens# _CIF_ASCE_PRIMARY is set, load user space asce 6794bfc86ceSHeiko Carstens# 680*606aa4aaSHeiko Carstens.Lio_asce_primary: 681*606aa4aaSHeiko Carstens ni __LC_CPU_FLAGS+7,255-_CIF_ASCE_PRIMARY 6824bfc86ceSHeiko Carstens lctlg %c1,%c1,__LC_USER_ASCE # load primary asce 6834bfc86ceSHeiko Carstens j .Lio_return 6844bfc86ceSHeiko Carstens 6854bfc86ceSHeiko Carstens# 6869977e886SHendrik Brueckner# CIF_FPU is set, restore floating-point controls and floating-point registers. 6879977e886SHendrik Brueckner# 6889977e886SHendrik Brueckner.Lio_vxrs: 6899977e886SHendrik Brueckner larl %r14,.Lio_return 6909977e886SHendrik Brueckner jg load_fpu_regs 6919977e886SHendrik Brueckner 6929977e886SHendrik Brueckner# 6934bfc86ceSHeiko Carstens# _TIF_NEED_RESCHED is set, call schedule 6944bfc86ceSHeiko Carstens# 6954bfc86ceSHeiko Carstens.Lio_reschedule: 6964bfc86ceSHeiko Carstens # TRACE_IRQS_ON already done at .Lio_return 6974bfc86ceSHeiko Carstens ssm __LC_SVC_NEW_PSW # reenable interrupts 6984bfc86ceSHeiko Carstens brasl %r14,schedule # call scheduler 6994bfc86ceSHeiko Carstens ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts 7004bfc86ceSHeiko Carstens TRACE_IRQS_OFF 7014bfc86ceSHeiko Carstens j .Lio_return 7024bfc86ceSHeiko Carstens 7034bfc86ceSHeiko Carstens# 7044bfc86ceSHeiko Carstens# _TIF_SIGPENDING or is set, call do_signal 7054bfc86ceSHeiko Carstens# 7064bfc86ceSHeiko Carstens.Lio_sigpending: 7074bfc86ceSHeiko Carstens # TRACE_IRQS_ON already done at .Lio_return 7084bfc86ceSHeiko Carstens ssm __LC_SVC_NEW_PSW # reenable interrupts 7094bfc86ceSHeiko Carstens lgr %r2,%r11 # pass pointer to pt_regs 7104bfc86ceSHeiko Carstens brasl %r14,do_signal 7114bfc86ceSHeiko Carstens ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts 7124bfc86ceSHeiko Carstens TRACE_IRQS_OFF 7134bfc86ceSHeiko Carstens j .Lio_return 7144bfc86ceSHeiko Carstens 7154bfc86ceSHeiko Carstens# 7164bfc86ceSHeiko Carstens# _TIF_NOTIFY_RESUME or is set, call do_notify_resume 7174bfc86ceSHeiko Carstens# 7184bfc86ceSHeiko Carstens.Lio_notify_resume: 7194bfc86ceSHeiko Carstens # TRACE_IRQS_ON already done at .Lio_return 7204bfc86ceSHeiko Carstens ssm __LC_SVC_NEW_PSW # reenable interrupts 7214bfc86ceSHeiko Carstens lgr %r2,%r11 # pass pointer to pt_regs 7224bfc86ceSHeiko Carstens brasl %r14,do_notify_resume 7234bfc86ceSHeiko Carstens ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts 7244bfc86ceSHeiko Carstens TRACE_IRQS_OFF 7254bfc86ceSHeiko Carstens j .Lio_return 7264bfc86ceSHeiko Carstens 7274bfc86ceSHeiko Carstens/* 7284bfc86ceSHeiko Carstens * External interrupt handler routine 7294bfc86ceSHeiko Carstens */ 7304bfc86ceSHeiko CarstensENTRY(ext_int_handler) 7314bfc86ceSHeiko Carstens STCK __LC_INT_CLOCK 7324bfc86ceSHeiko Carstens stpt __LC_ASYNC_ENTER_TIMER 7334bfc86ceSHeiko Carstens stmg %r8,%r15,__LC_SAVE_AREA_ASYNC 734d5c352cdSHeiko Carstens lg %r12,__LC_CURRENT 7359977e886SHendrik Brueckner larl %r13,cleanup_critical 7364bfc86ceSHeiko Carstens lmg %r8,%r9,__LC_EXT_OLD_PSW 7372acb94f4SMartin Schwidefsky SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_ENTER_TIMER 7384bfc86ceSHeiko Carstens stmg %r0,%r7,__PT_R0(%r11) 7394bfc86ceSHeiko Carstens mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC 7404bfc86ceSHeiko Carstens stmg %r8,%r9,__PT_PSW(%r11) 7414bfc86ceSHeiko Carstens lghi %r1,__LC_EXT_PARAMS2 7424bfc86ceSHeiko Carstens mvc __PT_INT_CODE(4,%r11),__LC_EXT_CPU_ADDR 7434bfc86ceSHeiko Carstens mvc __PT_INT_PARM(4,%r11),__LC_EXT_PARAMS 7444bfc86ceSHeiko Carstens mvc __PT_INT_PARM_LONG(8,%r11),0(%r1) 7454bfc86ceSHeiko Carstens xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11) 746db7e007fSHeiko Carstens TSTMSK __LC_CPU_FLAGS,_CIF_IGNORE_IRQ 747db7e007fSHeiko Carstens jo .Lio_restore 7484bfc86ceSHeiko Carstens TRACE_IRQS_OFF 7494bfc86ceSHeiko Carstens xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) 7504bfc86ceSHeiko Carstens lgr %r2,%r11 # pass pointer to pt_regs 7514bfc86ceSHeiko Carstens lghi %r3,EXT_INTERRUPT 7524bfc86ceSHeiko Carstens brasl %r14,do_IRQ 7534bfc86ceSHeiko Carstens j .Lio_return 7544bfc86ceSHeiko Carstens 7554bfc86ceSHeiko Carstens/* 7564bfc86ceSHeiko Carstens * Load idle PSW. The second "half" of this function is in .Lcleanup_idle. 7574bfc86ceSHeiko Carstens */ 7584bfc86ceSHeiko CarstensENTRY(psw_idle) 7594bfc86ceSHeiko Carstens stg %r3,__SF_EMPTY(%r15) 7604bfc86ceSHeiko Carstens larl %r1,.Lpsw_idle_lpsw+4 7614bfc86ceSHeiko Carstens stg %r1,__SF_EMPTY+8(%r15) 76272d38b19SMartin Schwidefsky#ifdef CONFIG_SMP 76372d38b19SMartin Schwidefsky larl %r1,smp_cpu_mtid 76472d38b19SMartin Schwidefsky llgf %r1,0(%r1) 76572d38b19SMartin Schwidefsky ltgr %r1,%r1 76672d38b19SMartin Schwidefsky jz .Lpsw_idle_stcctm 76772d38b19SMartin Schwidefsky .insn rsy,0xeb0000000017,%r1,5,__SF_EMPTY+16(%r15) 76872d38b19SMartin Schwidefsky.Lpsw_idle_stcctm: 76972d38b19SMartin Schwidefsky#endif 770419123f9SMartin Schwidefsky oi __LC_CPU_FLAGS+7,_CIF_ENABLED_WAIT 7714bfc86ceSHeiko Carstens STCK __CLOCK_IDLE_ENTER(%r2) 7724bfc86ceSHeiko Carstens stpt __TIMER_IDLE_ENTER(%r2) 7734bfc86ceSHeiko Carstens.Lpsw_idle_lpsw: 7744bfc86ceSHeiko Carstens lpswe __SF_EMPTY(%r15) 7754bfc86ceSHeiko Carstens br %r14 7764bfc86ceSHeiko Carstens.Lpsw_idle_end: 7774bfc86ceSHeiko Carstens 778b5510d9bSHendrik Brueckner/* 779b5510d9bSHendrik Brueckner * Store floating-point controls and floating-point or vector register 780b5510d9bSHendrik Brueckner * depending whether the vector facility is available. A critical section 781b5510d9bSHendrik Brueckner * cleanup assures that the registers are stored even if interrupted for 782b5510d9bSHendrik Brueckner * some other work. The CIF_FPU flag is set to trigger a lazy restore 783b5510d9bSHendrik Brueckner * of the register contents at return from io or a system call. 7849977e886SHendrik Brueckner */ 7859977e886SHendrik BruecknerENTRY(save_fpu_regs) 786d0164ee2SHendrik Brueckner lg %r2,__LC_CURRENT 787d0164ee2SHendrik Brueckner aghi %r2,__TASK_thread 78883abeffbSHendrik Brueckner TSTMSK __LC_CPU_FLAGS,_CIF_FPU 7899977e886SHendrik Brueckner bor %r14 790d0164ee2SHendrik Brueckner stfpc __THREAD_FPU_fpc(%r2) 791d0164ee2SHendrik Brueckner lg %r3,__THREAD_FPU_regs(%r2) 79283abeffbSHendrik Brueckner TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_VX 7939977e886SHendrik Brueckner jz .Lsave_fpu_regs_fp # no -> store FP regs 7949977e886SHendrik Brueckner VSTM %v0,%v15,0,%r3 # vstm 0,15,0(3) 7959977e886SHendrik Brueckner VSTM %v16,%v31,256,%r3 # vstm 16,31,256(3) 7969977e886SHendrik Brueckner j .Lsave_fpu_regs_done # -> set CIF_FPU flag 7979977e886SHendrik Brueckner.Lsave_fpu_regs_fp: 7989977e886SHendrik Brueckner std 0,0(%r3) 7999977e886SHendrik Brueckner std 1,8(%r3) 8009977e886SHendrik Brueckner std 2,16(%r3) 8019977e886SHendrik Brueckner std 3,24(%r3) 8029977e886SHendrik Brueckner std 4,32(%r3) 8039977e886SHendrik Brueckner std 5,40(%r3) 8049977e886SHendrik Brueckner std 6,48(%r3) 8059977e886SHendrik Brueckner std 7,56(%r3) 8069977e886SHendrik Brueckner std 8,64(%r3) 8079977e886SHendrik Brueckner std 9,72(%r3) 8089977e886SHendrik Brueckner std 10,80(%r3) 8099977e886SHendrik Brueckner std 11,88(%r3) 8109977e886SHendrik Brueckner std 12,96(%r3) 8119977e886SHendrik Brueckner std 13,104(%r3) 8129977e886SHendrik Brueckner std 14,112(%r3) 8139977e886SHendrik Brueckner std 15,120(%r3) 8149977e886SHendrik Brueckner.Lsave_fpu_regs_done: 8159977e886SHendrik Brueckner oi __LC_CPU_FLAGS+7,_CIF_FPU 8169977e886SHendrik Brueckner br %r14 8179977e886SHendrik Brueckner.Lsave_fpu_regs_end: 818711f5df7SAl Viro#if IS_ENABLED(CONFIG_KVM) 819711f5df7SAl ViroEXPORT_SYMBOL(save_fpu_regs) 820711f5df7SAl Viro#endif 8219977e886SHendrik Brueckner 822b5510d9bSHendrik Brueckner/* 823b5510d9bSHendrik Brueckner * Load floating-point controls and floating-point or vector registers. 824b5510d9bSHendrik Brueckner * A critical section cleanup assures that the register contents are 825b5510d9bSHendrik Brueckner * loaded even if interrupted for some other work. 8269977e886SHendrik Brueckner * 8279977e886SHendrik Brueckner * There are special calling conventions to fit into sysc and io return work: 8289977e886SHendrik Brueckner * %r15: <kernel stack> 8299977e886SHendrik Brueckner * The function requires: 830b5510d9bSHendrik Brueckner * %r4 8319977e886SHendrik Brueckner */ 8329977e886SHendrik Bruecknerload_fpu_regs: 833d0164ee2SHendrik Brueckner lg %r4,__LC_CURRENT 834d0164ee2SHendrik Brueckner aghi %r4,__TASK_thread 83583abeffbSHendrik Brueckner TSTMSK __LC_CPU_FLAGS,_CIF_FPU 8369977e886SHendrik Brueckner bnor %r14 837d0164ee2SHendrik Brueckner lfpc __THREAD_FPU_fpc(%r4) 83883abeffbSHendrik Brueckner TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_VX 839d0164ee2SHendrik Brueckner lg %r4,__THREAD_FPU_regs(%r4) # %r4 <- reg save area 840b5510d9bSHendrik Brueckner jz .Lload_fpu_regs_fp # -> no VX, load FP regs 8419977e886SHendrik Brueckner VLM %v0,%v15,0,%r4 8429977e886SHendrik Brueckner VLM %v16,%v31,256,%r4 8439977e886SHendrik Brueckner j .Lload_fpu_regs_done 8449977e886SHendrik Brueckner.Lload_fpu_regs_fp: 8459977e886SHendrik Brueckner ld 0,0(%r4) 8469977e886SHendrik Brueckner ld 1,8(%r4) 8479977e886SHendrik Brueckner ld 2,16(%r4) 8489977e886SHendrik Brueckner ld 3,24(%r4) 8499977e886SHendrik Brueckner ld 4,32(%r4) 8509977e886SHendrik Brueckner ld 5,40(%r4) 8519977e886SHendrik Brueckner ld 6,48(%r4) 8529977e886SHendrik Brueckner ld 7,56(%r4) 8539977e886SHendrik Brueckner ld 8,64(%r4) 8549977e886SHendrik Brueckner ld 9,72(%r4) 8559977e886SHendrik Brueckner ld 10,80(%r4) 8569977e886SHendrik Brueckner ld 11,88(%r4) 8579977e886SHendrik Brueckner ld 12,96(%r4) 8589977e886SHendrik Brueckner ld 13,104(%r4) 8599977e886SHendrik Brueckner ld 14,112(%r4) 8609977e886SHendrik Brueckner ld 15,120(%r4) 8619977e886SHendrik Brueckner.Lload_fpu_regs_done: 8629977e886SHendrik Brueckner ni __LC_CPU_FLAGS+7,255-_CIF_FPU 8639977e886SHendrik Brueckner br %r14 8649977e886SHendrik Brueckner.Lload_fpu_regs_end: 8659977e886SHendrik Brueckner 8664bfc86ceSHeiko Carstens.L__critical_end: 8674bfc86ceSHeiko Carstens 8684bfc86ceSHeiko Carstens/* 8694bfc86ceSHeiko Carstens * Machine check handler routines 8704bfc86ceSHeiko Carstens */ 8714bfc86ceSHeiko CarstensENTRY(mcck_int_handler) 8724bfc86ceSHeiko Carstens STCK __LC_MCCK_CLOCK 8734bfc86ceSHeiko Carstens la %r1,4095 # revalidate r1 8744bfc86ceSHeiko Carstens spt __LC_CPU_TIMER_SAVE_AREA-4095(%r1) # revalidate cpu timer 8754bfc86ceSHeiko Carstens lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs 876d5c352cdSHeiko Carstens lg %r12,__LC_CURRENT 8779977e886SHendrik Brueckner larl %r13,cleanup_critical 8784bfc86ceSHeiko Carstens lmg %r8,%r9,__LC_MCK_OLD_PSW 87983abeffbSHendrik Brueckner TSTMSK __LC_MCCK_CODE,MCCK_CODE_SYSTEM_DAMAGE 8804bfc86ceSHeiko Carstens jo .Lmcck_panic # yes -> rest of mcck code invalid 8814bfc86ceSHeiko Carstens lghi %r14,__LC_CPU_TIMER_SAVE_AREA 8824bfc86ceSHeiko Carstens mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) 88383abeffbSHendrik Brueckner TSTMSK __LC_MCCK_CODE,MCCK_CODE_CPU_TIMER_VALID 8844bfc86ceSHeiko Carstens jo 3f 8854bfc86ceSHeiko Carstens la %r14,__LC_SYNC_ENTER_TIMER 8864bfc86ceSHeiko Carstens clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER 8874bfc86ceSHeiko Carstens jl 0f 8884bfc86ceSHeiko Carstens la %r14,__LC_ASYNC_ENTER_TIMER 8894bfc86ceSHeiko Carstens0: clc 0(8,%r14),__LC_EXIT_TIMER 8904bfc86ceSHeiko Carstens jl 1f 8914bfc86ceSHeiko Carstens la %r14,__LC_EXIT_TIMER 8924bfc86ceSHeiko Carstens1: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER 8934bfc86ceSHeiko Carstens jl 2f 8944bfc86ceSHeiko Carstens la %r14,__LC_LAST_UPDATE_TIMER 8954bfc86ceSHeiko Carstens2: spt 0(%r14) 8964bfc86ceSHeiko Carstens mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) 89783abeffbSHendrik Brueckner3: TSTMSK __LC_MCCK_CODE,(MCCK_CODE_PSW_MWP_VALID|MCCK_CODE_PSW_IA_VALID) 8984bfc86ceSHeiko Carstens jno .Lmcck_panic # no -> skip cleanup critical 8992acb94f4SMartin Schwidefsky SWITCH_ASYNC __LC_GPREGS_SAVE_AREA+64,__LC_MCCK_ENTER_TIMER 9004bfc86ceSHeiko Carstens.Lmcck_skip: 9014bfc86ceSHeiko Carstens lghi %r14,__LC_GPREGS_SAVE_AREA+64 9024bfc86ceSHeiko Carstens stmg %r0,%r7,__PT_R0(%r11) 9034bfc86ceSHeiko Carstens mvc __PT_R8(64,%r11),0(%r14) 9044bfc86ceSHeiko Carstens stmg %r8,%r9,__PT_PSW(%r11) 9054bfc86ceSHeiko Carstens xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11) 9064bfc86ceSHeiko Carstens xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) 9074bfc86ceSHeiko Carstens lgr %r2,%r11 # pass pointer to pt_regs 9084bfc86ceSHeiko Carstens brasl %r14,s390_do_machine_check 9094bfc86ceSHeiko Carstens tm __PT_PSW+1(%r11),0x01 # returning to user ? 9104bfc86ceSHeiko Carstens jno .Lmcck_return 9114bfc86ceSHeiko Carstens lg %r1,__LC_KERNEL_STACK # switch to kernel stack 9124bfc86ceSHeiko Carstens mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) 9134bfc86ceSHeiko Carstens xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) 9144bfc86ceSHeiko Carstens la %r11,STACK_FRAME_OVERHEAD(%r1) 9154bfc86ceSHeiko Carstens lgr %r15,%r1 9164bfc86ceSHeiko Carstens ssm __LC_PGM_NEW_PSW # turn dat on, keep irqs off 91783abeffbSHendrik Brueckner TSTMSK __LC_CPU_FLAGS,_CIF_MCCK_PENDING 9184bfc86ceSHeiko Carstens jno .Lmcck_return 9194bfc86ceSHeiko Carstens TRACE_IRQS_OFF 9204bfc86ceSHeiko Carstens brasl %r14,s390_handle_mcck 9214bfc86ceSHeiko Carstens TRACE_IRQS_ON 9224bfc86ceSHeiko Carstens.Lmcck_return: 9234bfc86ceSHeiko Carstens lg %r14,__LC_VDSO_PER_CPU 9244bfc86ceSHeiko Carstens lmg %r0,%r10,__PT_R0(%r11) 9254bfc86ceSHeiko Carstens mvc __LC_RETURN_MCCK_PSW(16),__PT_PSW(%r11) # move return PSW 9264bfc86ceSHeiko Carstens tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? 9274bfc86ceSHeiko Carstens jno 0f 9284bfc86ceSHeiko Carstens stpt __LC_EXIT_TIMER 9294bfc86ceSHeiko Carstens mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER 9304bfc86ceSHeiko Carstens0: lmg %r11,%r15,__PT_R11(%r11) 9314bfc86ceSHeiko Carstens lpswe __LC_RETURN_MCCK_PSW 9324bfc86ceSHeiko Carstens 9334bfc86ceSHeiko Carstens.Lmcck_panic: 9344bfc86ceSHeiko Carstens lg %r15,__LC_PANIC_STACK 935ce4dda3fSMartin Schwidefsky la %r11,STACK_FRAME_OVERHEAD(%r15) 9364bfc86ceSHeiko Carstens j .Lmcck_skip 9374bfc86ceSHeiko Carstens 9384bfc86ceSHeiko Carstens# 9394bfc86ceSHeiko Carstens# PSW restart interrupt handler 9404bfc86ceSHeiko Carstens# 9414bfc86ceSHeiko CarstensENTRY(restart_int_handler) 942e22cf8caSChristian Borntraeger TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_LPP 943e22cf8caSChristian Borntraeger jz 0f 944e22cf8caSChristian Borntraeger .insn s,0xb2800000,__LC_LPP 945e22cf8caSChristian Borntraeger0: stg %r15,__LC_SAVE_AREA_RESTART 9464bfc86ceSHeiko Carstens lg %r15,__LC_RESTART_STACK 9474bfc86ceSHeiko Carstens aghi %r15,-__PT_SIZE # create pt_regs on stack 9484bfc86ceSHeiko Carstens xc 0(__PT_SIZE,%r15),0(%r15) 9494bfc86ceSHeiko Carstens stmg %r0,%r14,__PT_R0(%r15) 9504bfc86ceSHeiko Carstens mvc __PT_R15(8,%r15),__LC_SAVE_AREA_RESTART 9514bfc86ceSHeiko Carstens mvc __PT_PSW(16,%r15),__LC_RST_OLD_PSW # store restart old psw 9524bfc86ceSHeiko Carstens aghi %r15,-STACK_FRAME_OVERHEAD # create stack frame on stack 9534bfc86ceSHeiko Carstens xc 0(STACK_FRAME_OVERHEAD,%r15),0(%r15) 9544bfc86ceSHeiko Carstens lg %r1,__LC_RESTART_FN # load fn, parm & source cpu 9554bfc86ceSHeiko Carstens lg %r2,__LC_RESTART_DATA 9564bfc86ceSHeiko Carstens lg %r3,__LC_RESTART_SOURCE 9574bfc86ceSHeiko Carstens ltgr %r3,%r3 # test source cpu address 9584bfc86ceSHeiko Carstens jm 1f # negative -> skip source stop 9594bfc86ceSHeiko Carstens0: sigp %r4,%r3,SIGP_SENSE # sigp sense to source cpu 9604bfc86ceSHeiko Carstens brc 10,0b # wait for status stored 9614bfc86ceSHeiko Carstens1: basr %r14,%r1 # call function 9624bfc86ceSHeiko Carstens stap __SF_EMPTY(%r15) # store cpu address 9634bfc86ceSHeiko Carstens llgh %r3,__SF_EMPTY(%r15) 9644bfc86ceSHeiko Carstens2: sigp %r4,%r3,SIGP_STOP # sigp stop to current cpu 9654bfc86ceSHeiko Carstens brc 2,2b 9664bfc86ceSHeiko Carstens3: j 3b 9674bfc86ceSHeiko Carstens 9684bfc86ceSHeiko Carstens .section .kprobes.text, "ax" 9694bfc86ceSHeiko Carstens 9704bfc86ceSHeiko Carstens#ifdef CONFIG_CHECK_STACK 9714bfc86ceSHeiko Carstens/* 9724bfc86ceSHeiko Carstens * The synchronous or the asynchronous stack overflowed. We are dead. 9734bfc86ceSHeiko Carstens * No need to properly save the registers, we are going to panic anyway. 9744bfc86ceSHeiko Carstens * Setup a pt_regs so that show_trace can provide a good call trace. 9754bfc86ceSHeiko Carstens */ 9764bfc86ceSHeiko Carstensstack_overflow: 9774bfc86ceSHeiko Carstens lg %r15,__LC_PANIC_STACK # change to panic stack 9784bfc86ceSHeiko Carstens la %r11,STACK_FRAME_OVERHEAD(%r15) 9794bfc86ceSHeiko Carstens stmg %r0,%r7,__PT_R0(%r11) 9804bfc86ceSHeiko Carstens stmg %r8,%r9,__PT_PSW(%r11) 9814bfc86ceSHeiko Carstens mvc __PT_R8(64,%r11),0(%r14) 9824bfc86ceSHeiko Carstens stg %r10,__PT_ORIG_GPR2(%r11) # store last break to orig_gpr2 9834bfc86ceSHeiko Carstens xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) 9844bfc86ceSHeiko Carstens lgr %r2,%r11 # pass pointer to pt_regs 9854bfc86ceSHeiko Carstens jg kernel_stack_overflow 9864bfc86ceSHeiko Carstens#endif 9874bfc86ceSHeiko Carstens 9884bfc86ceSHeiko Carstenscleanup_critical: 989d0fc4107SMartin Schwidefsky#if IS_ENABLED(CONFIG_KVM) 990d0fc4107SMartin Schwidefsky clg %r9,BASED(.Lcleanup_table_sie) # .Lsie_gmap 991d0fc4107SMartin Schwidefsky jl 0f 992d0fc4107SMartin Schwidefsky clg %r9,BASED(.Lcleanup_table_sie+8)# .Lsie_done 993d0fc4107SMartin Schwidefsky jl .Lcleanup_sie 994d0fc4107SMartin Schwidefsky#endif 9954bfc86ceSHeiko Carstens clg %r9,BASED(.Lcleanup_table) # system_call 9964bfc86ceSHeiko Carstens jl 0f 9974bfc86ceSHeiko Carstens clg %r9,BASED(.Lcleanup_table+8) # .Lsysc_do_svc 9984bfc86ceSHeiko Carstens jl .Lcleanup_system_call 9994bfc86ceSHeiko Carstens clg %r9,BASED(.Lcleanup_table+16) # .Lsysc_tif 10004bfc86ceSHeiko Carstens jl 0f 10014bfc86ceSHeiko Carstens clg %r9,BASED(.Lcleanup_table+24) # .Lsysc_restore 10024bfc86ceSHeiko Carstens jl .Lcleanup_sysc_tif 10034bfc86ceSHeiko Carstens clg %r9,BASED(.Lcleanup_table+32) # .Lsysc_done 10044bfc86ceSHeiko Carstens jl .Lcleanup_sysc_restore 10054bfc86ceSHeiko Carstens clg %r9,BASED(.Lcleanup_table+40) # .Lio_tif 10064bfc86ceSHeiko Carstens jl 0f 10074bfc86ceSHeiko Carstens clg %r9,BASED(.Lcleanup_table+48) # .Lio_restore 10084bfc86ceSHeiko Carstens jl .Lcleanup_io_tif 10094bfc86ceSHeiko Carstens clg %r9,BASED(.Lcleanup_table+56) # .Lio_done 10104bfc86ceSHeiko Carstens jl .Lcleanup_io_restore 10114bfc86ceSHeiko Carstens clg %r9,BASED(.Lcleanup_table+64) # psw_idle 10124bfc86ceSHeiko Carstens jl 0f 10134bfc86ceSHeiko Carstens clg %r9,BASED(.Lcleanup_table+72) # .Lpsw_idle_end 10144bfc86ceSHeiko Carstens jl .Lcleanup_idle 10159977e886SHendrik Brueckner clg %r9,BASED(.Lcleanup_table+80) # save_fpu_regs 10169977e886SHendrik Brueckner jl 0f 10179977e886SHendrik Brueckner clg %r9,BASED(.Lcleanup_table+88) # .Lsave_fpu_regs_end 10189977e886SHendrik Brueckner jl .Lcleanup_save_fpu_regs 10199977e886SHendrik Brueckner clg %r9,BASED(.Lcleanup_table+96) # load_fpu_regs 10209977e886SHendrik Brueckner jl 0f 10219977e886SHendrik Brueckner clg %r9,BASED(.Lcleanup_table+104) # .Lload_fpu_regs_end 10229977e886SHendrik Brueckner jl .Lcleanup_load_fpu_regs 10234bfc86ceSHeiko Carstens0: br %r14 10244bfc86ceSHeiko Carstens 1025d0fc4107SMartin Schwidefsky .align 8 1026d0fc4107SMartin Schwidefsky.Lcleanup_table: 1027d0fc4107SMartin Schwidefsky .quad system_call 1028d0fc4107SMartin Schwidefsky .quad .Lsysc_do_svc 1029d0fc4107SMartin Schwidefsky .quad .Lsysc_tif 1030d0fc4107SMartin Schwidefsky .quad .Lsysc_restore 1031d0fc4107SMartin Schwidefsky .quad .Lsysc_done 1032d0fc4107SMartin Schwidefsky .quad .Lio_tif 1033d0fc4107SMartin Schwidefsky .quad .Lio_restore 1034d0fc4107SMartin Schwidefsky .quad .Lio_done 1035d0fc4107SMartin Schwidefsky .quad psw_idle 1036d0fc4107SMartin Schwidefsky .quad .Lpsw_idle_end 1037d0fc4107SMartin Schwidefsky .quad save_fpu_regs 1038d0fc4107SMartin Schwidefsky .quad .Lsave_fpu_regs_end 1039d0fc4107SMartin Schwidefsky .quad load_fpu_regs 1040d0fc4107SMartin Schwidefsky .quad .Lload_fpu_regs_end 1041d0fc4107SMartin Schwidefsky 1042d0fc4107SMartin Schwidefsky#if IS_ENABLED(CONFIG_KVM) 1043d0fc4107SMartin Schwidefsky.Lcleanup_table_sie: 1044d0fc4107SMartin Schwidefsky .quad .Lsie_gmap 1045d0fc4107SMartin Schwidefsky .quad .Lsie_done 1046d0fc4107SMartin Schwidefsky 1047d0fc4107SMartin Schwidefsky.Lcleanup_sie: 1048d0fc4107SMartin Schwidefsky lg %r9,__SF_EMPTY(%r15) # get control block pointer 1049e22cf8caSChristian Borntraeger ni __SIE_PROG0C+3(%r9),0xfe # no longer in SIE 1050d0fc4107SMartin Schwidefsky lctlg %c1,%c1,__LC_USER_ASCE # load primary asce 1051d0fc4107SMartin Schwidefsky larl %r9,sie_exit # skip forward to sie_exit 1052d0fc4107SMartin Schwidefsky br %r14 1053d0fc4107SMartin Schwidefsky#endif 10544bfc86ceSHeiko Carstens 10554bfc86ceSHeiko Carstens.Lcleanup_system_call: 10564bfc86ceSHeiko Carstens # check if stpt has been executed 10574bfc86ceSHeiko Carstens clg %r9,BASED(.Lcleanup_system_call_insn) 10584bfc86ceSHeiko Carstens jh 0f 10594bfc86ceSHeiko Carstens mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER 10604bfc86ceSHeiko Carstens cghi %r11,__LC_SAVE_AREA_ASYNC 10614bfc86ceSHeiko Carstens je 0f 10624bfc86ceSHeiko Carstens mvc __LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER 10634bfc86ceSHeiko Carstens0: # check if stmg has been executed 10644bfc86ceSHeiko Carstens clg %r9,BASED(.Lcleanup_system_call_insn+8) 10654bfc86ceSHeiko Carstens jh 0f 10664bfc86ceSHeiko Carstens mvc __LC_SAVE_AREA_SYNC(64),0(%r11) 10674bfc86ceSHeiko Carstens0: # check if base register setup + TIF bit load has been done 10684bfc86ceSHeiko Carstens clg %r9,BASED(.Lcleanup_system_call_insn+16) 10694bfc86ceSHeiko Carstens jhe 0f 107034525e1fSMartin Schwidefsky # set up saved register r12 task struct pointer 107134525e1fSMartin Schwidefsky stg %r12,32(%r11) 107234525e1fSMartin Schwidefsky # set up saved register r13 __TASK_thread offset 107334525e1fSMartin Schwidefsky mvc 40(8,%r11),BASED(.Lcleanup_system_call_const) 10744bfc86ceSHeiko Carstens0: # check if the user time update has been done 10754bfc86ceSHeiko Carstens clg %r9,BASED(.Lcleanup_system_call_insn+24) 10764bfc86ceSHeiko Carstens jh 0f 10774bfc86ceSHeiko Carstens lg %r15,__LC_EXIT_TIMER 10784bfc86ceSHeiko Carstens slg %r15,__LC_SYNC_ENTER_TIMER 10794bfc86ceSHeiko Carstens alg %r15,__LC_USER_TIMER 10804bfc86ceSHeiko Carstens stg %r15,__LC_USER_TIMER 10814bfc86ceSHeiko Carstens0: # check if the system time update has been done 10824bfc86ceSHeiko Carstens clg %r9,BASED(.Lcleanup_system_call_insn+32) 10834bfc86ceSHeiko Carstens jh 0f 10844bfc86ceSHeiko Carstens lg %r15,__LC_LAST_UPDATE_TIMER 10854bfc86ceSHeiko Carstens slg %r15,__LC_EXIT_TIMER 10864bfc86ceSHeiko Carstens alg %r15,__LC_SYSTEM_TIMER 10874bfc86ceSHeiko Carstens stg %r15,__LC_SYSTEM_TIMER 10884bfc86ceSHeiko Carstens0: # update accounting time stamp 10894bfc86ceSHeiko Carstens mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER 109034525e1fSMartin Schwidefsky # set up saved register r11 10914bfc86ceSHeiko Carstens lg %r15,__LC_KERNEL_STACK 10924bfc86ceSHeiko Carstens la %r9,STACK_FRAME_OVERHEAD(%r15) 10934bfc86ceSHeiko Carstens stg %r9,24(%r11) # r11 pt_regs pointer 10944bfc86ceSHeiko Carstens # fill pt_regs 10954bfc86ceSHeiko Carstens mvc __PT_R8(64,%r9),__LC_SAVE_AREA_SYNC 10964bfc86ceSHeiko Carstens stmg %r0,%r7,__PT_R0(%r9) 10974bfc86ceSHeiko Carstens mvc __PT_PSW(16,%r9),__LC_SVC_OLD_PSW 10984bfc86ceSHeiko Carstens mvc __PT_INT_CODE(4,%r9),__LC_SVC_ILC 10994bfc86ceSHeiko Carstens xc __PT_FLAGS(8,%r9),__PT_FLAGS(%r9) 11004bfc86ceSHeiko Carstens mvi __PT_FLAGS+7(%r9),_PIF_SYSCALL 11014bfc86ceSHeiko Carstens # setup saved register r15 11024bfc86ceSHeiko Carstens stg %r15,56(%r11) # r15 stack pointer 11034bfc86ceSHeiko Carstens # set new psw address and exit 11044bfc86ceSHeiko Carstens larl %r9,.Lsysc_do_svc 11054bfc86ceSHeiko Carstens br %r14 11064bfc86ceSHeiko Carstens.Lcleanup_system_call_insn: 11074bfc86ceSHeiko Carstens .quad system_call 11084bfc86ceSHeiko Carstens .quad .Lsysc_stmg 11094bfc86ceSHeiko Carstens .quad .Lsysc_per 1110a359bb11SMartin Schwidefsky .quad .Lsysc_vtime+36 11114bfc86ceSHeiko Carstens .quad .Lsysc_vtime+42 111234525e1fSMartin Schwidefsky.Lcleanup_system_call_const: 111334525e1fSMartin Schwidefsky .quad __TASK_thread 11144bfc86ceSHeiko Carstens 11154bfc86ceSHeiko Carstens.Lcleanup_sysc_tif: 11164bfc86ceSHeiko Carstens larl %r9,.Lsysc_tif 11174bfc86ceSHeiko Carstens br %r14 11184bfc86ceSHeiko Carstens 11194bfc86ceSHeiko Carstens.Lcleanup_sysc_restore: 11204bfc86ceSHeiko Carstens clg %r9,BASED(.Lcleanup_sysc_restore_insn) 11214bfc86ceSHeiko Carstens je 0f 11224bfc86ceSHeiko Carstens lg %r9,24(%r11) # get saved pointer to pt_regs 11234bfc86ceSHeiko Carstens mvc __LC_RETURN_PSW(16),__PT_PSW(%r9) 11244bfc86ceSHeiko Carstens mvc 0(64,%r11),__PT_R8(%r9) 11254bfc86ceSHeiko Carstens lmg %r0,%r7,__PT_R0(%r9) 11264bfc86ceSHeiko Carstens0: lmg %r8,%r9,__LC_RETURN_PSW 11274bfc86ceSHeiko Carstens br %r14 11284bfc86ceSHeiko Carstens.Lcleanup_sysc_restore_insn: 11294bfc86ceSHeiko Carstens .quad .Lsysc_done - 4 11304bfc86ceSHeiko Carstens 11314bfc86ceSHeiko Carstens.Lcleanup_io_tif: 11324bfc86ceSHeiko Carstens larl %r9,.Lio_tif 11334bfc86ceSHeiko Carstens br %r14 11344bfc86ceSHeiko Carstens 11354bfc86ceSHeiko Carstens.Lcleanup_io_restore: 11364bfc86ceSHeiko Carstens clg %r9,BASED(.Lcleanup_io_restore_insn) 11374bfc86ceSHeiko Carstens je 0f 11384bfc86ceSHeiko Carstens lg %r9,24(%r11) # get saved r11 pointer to pt_regs 11394bfc86ceSHeiko Carstens mvc __LC_RETURN_PSW(16),__PT_PSW(%r9) 11404bfc86ceSHeiko Carstens mvc 0(64,%r11),__PT_R8(%r9) 11414bfc86ceSHeiko Carstens lmg %r0,%r7,__PT_R0(%r9) 11424bfc86ceSHeiko Carstens0: lmg %r8,%r9,__LC_RETURN_PSW 11434bfc86ceSHeiko Carstens br %r14 11444bfc86ceSHeiko Carstens.Lcleanup_io_restore_insn: 11454bfc86ceSHeiko Carstens .quad .Lio_done - 4 11464bfc86ceSHeiko Carstens 11474bfc86ceSHeiko Carstens.Lcleanup_idle: 1148419123f9SMartin Schwidefsky ni __LC_CPU_FLAGS+7,255-_CIF_ENABLED_WAIT 11494bfc86ceSHeiko Carstens # copy interrupt clock & cpu timer 11504bfc86ceSHeiko Carstens mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_INT_CLOCK 11514bfc86ceSHeiko Carstens mvc __TIMER_IDLE_EXIT(8,%r2),__LC_ASYNC_ENTER_TIMER 11524bfc86ceSHeiko Carstens cghi %r11,__LC_SAVE_AREA_ASYNC 11534bfc86ceSHeiko Carstens je 0f 11544bfc86ceSHeiko Carstens mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_MCCK_CLOCK 11554bfc86ceSHeiko Carstens mvc __TIMER_IDLE_EXIT(8,%r2),__LC_MCCK_ENTER_TIMER 11564bfc86ceSHeiko Carstens0: # check if stck & stpt have been executed 11574bfc86ceSHeiko Carstens clg %r9,BASED(.Lcleanup_idle_insn) 11584bfc86ceSHeiko Carstens jhe 1f 11594bfc86ceSHeiko Carstens mvc __CLOCK_IDLE_ENTER(8,%r2),__CLOCK_IDLE_EXIT(%r2) 11604bfc86ceSHeiko Carstens mvc __TIMER_IDLE_ENTER(8,%r2),__TIMER_IDLE_EXIT(%r2) 116172d38b19SMartin Schwidefsky1: # calculate idle cycles 116272d38b19SMartin Schwidefsky#ifdef CONFIG_SMP 116372d38b19SMartin Schwidefsky clg %r9,BASED(.Lcleanup_idle_insn) 116472d38b19SMartin Schwidefsky jl 3f 116572d38b19SMartin Schwidefsky larl %r1,smp_cpu_mtid 116672d38b19SMartin Schwidefsky llgf %r1,0(%r1) 116772d38b19SMartin Schwidefsky ltgr %r1,%r1 116872d38b19SMartin Schwidefsky jz 3f 116972d38b19SMartin Schwidefsky .insn rsy,0xeb0000000017,%r1,5,__SF_EMPTY+80(%r15) 117072d38b19SMartin Schwidefsky larl %r3,mt_cycles 117172d38b19SMartin Schwidefsky ag %r3,__LC_PERCPU_OFFSET 117272d38b19SMartin Schwidefsky la %r4,__SF_EMPTY+16(%r15) 117372d38b19SMartin Schwidefsky2: lg %r0,0(%r3) 117472d38b19SMartin Schwidefsky slg %r0,0(%r4) 117572d38b19SMartin Schwidefsky alg %r0,64(%r4) 117672d38b19SMartin Schwidefsky stg %r0,0(%r3) 117772d38b19SMartin Schwidefsky la %r3,8(%r3) 117872d38b19SMartin Schwidefsky la %r4,8(%r4) 117972d38b19SMartin Schwidefsky brct %r1,2b 118072d38b19SMartin Schwidefsky#endif 118172d38b19SMartin Schwidefsky3: # account system time going idle 11824bfc86ceSHeiko Carstens lg %r9,__LC_STEAL_TIMER 11834bfc86ceSHeiko Carstens alg %r9,__CLOCK_IDLE_ENTER(%r2) 11844bfc86ceSHeiko Carstens slg %r9,__LC_LAST_UPDATE_CLOCK 11854bfc86ceSHeiko Carstens stg %r9,__LC_STEAL_TIMER 11864bfc86ceSHeiko Carstens mvc __LC_LAST_UPDATE_CLOCK(8),__CLOCK_IDLE_EXIT(%r2) 11874bfc86ceSHeiko Carstens lg %r9,__LC_SYSTEM_TIMER 11884bfc86ceSHeiko Carstens alg %r9,__LC_LAST_UPDATE_TIMER 11894bfc86ceSHeiko Carstens slg %r9,__TIMER_IDLE_ENTER(%r2) 11904bfc86ceSHeiko Carstens stg %r9,__LC_SYSTEM_TIMER 11914bfc86ceSHeiko Carstens mvc __LC_LAST_UPDATE_TIMER(8),__TIMER_IDLE_EXIT(%r2) 11924bfc86ceSHeiko Carstens # prepare return psw 11934bfc86ceSHeiko Carstens nihh %r8,0xfcfd # clear irq & wait state bits 11944bfc86ceSHeiko Carstens lg %r9,48(%r11) # return from psw_idle 11954bfc86ceSHeiko Carstens br %r14 11964bfc86ceSHeiko Carstens.Lcleanup_idle_insn: 11974bfc86ceSHeiko Carstens .quad .Lpsw_idle_lpsw 11984bfc86ceSHeiko Carstens 11999977e886SHendrik Brueckner.Lcleanup_save_fpu_regs: 1200e370e476SMartin Schwidefsky larl %r9,save_fpu_regs 12019977e886SHendrik Brueckner br %r14 12029977e886SHendrik Brueckner 12039977e886SHendrik Brueckner.Lcleanup_load_fpu_regs: 1204e370e476SMartin Schwidefsky larl %r9,load_fpu_regs 12059977e886SHendrik Brueckner br %r14 12069977e886SHendrik Brueckner 12074bfc86ceSHeiko Carstens/* 12084bfc86ceSHeiko Carstens * Integer constants 12094bfc86ceSHeiko Carstens */ 12104bfc86ceSHeiko Carstens .align 8 12114bfc86ceSHeiko Carstens.Lcritical_start: 12124bfc86ceSHeiko Carstens .quad .L__critical_start 12134bfc86ceSHeiko Carstens.Lcritical_length: 12144bfc86ceSHeiko Carstens .quad .L__critical_end - .L__critical_start 12154bfc86ceSHeiko Carstens#if IS_ENABLED(CONFIG_KVM) 1216d0fc4107SMartin Schwidefsky.Lsie_critical_start: 12174bfc86ceSHeiko Carstens .quad .Lsie_gmap 12184bfc86ceSHeiko Carstens.Lsie_critical_length: 12194bfc86ceSHeiko Carstens .quad .Lsie_done - .Lsie_gmap 12204bfc86ceSHeiko Carstens#endif 12214bfc86ceSHeiko Carstens 12224bfc86ceSHeiko Carstens .section .rodata, "a" 1223a876cb3fSHeiko Carstens#define SYSCALL(esame,emu) .long esame 12244bfc86ceSHeiko Carstens .globl sys_call_table 12254bfc86ceSHeiko Carstenssys_call_table: 12264bfc86ceSHeiko Carstens#include "syscalls.S" 12274bfc86ceSHeiko Carstens#undef SYSCALL 12284bfc86ceSHeiko Carstens 12294bfc86ceSHeiko Carstens#ifdef CONFIG_COMPAT 12304bfc86ceSHeiko Carstens 1231a876cb3fSHeiko Carstens#define SYSCALL(esame,emu) .long emu 12324bfc86ceSHeiko Carstens .globl sys_call_table_emu 12334bfc86ceSHeiko Carstenssys_call_table_emu: 12344bfc86ceSHeiko Carstens#include "syscalls.S" 12354bfc86ceSHeiko Carstens#undef SYSCALL 12364bfc86ceSHeiko Carstens#endif 1237