| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * S390 low-level entry points. |
| * |
| * Copyright IBM Corp. 1999, 2012 |
| * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), |
| * Hartmut Penner (hp@de.ibm.com), |
| * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com), |
| * Heiko Carstens <heiko.carstens@de.ibm.com> |
| */ |
| |
| #include <linux/init.h> |
| #include <linux/linkage.h> |
| #include <asm/alternative-asm.h> |
| #include <asm/processor.h> |
| #include <asm/cache.h> |
| #include <asm/ctl_reg.h> |
| #include <asm/dwarf.h> |
| #include <asm/errno.h> |
| #include <asm/ptrace.h> |
| #include <asm/thread_info.h> |
| #include <asm/asm-offsets.h> |
| #include <asm/unistd.h> |
| #include <asm/page.h> |
| #include <asm/sigp.h> |
| #include <asm/irq.h> |
| #include <asm/vx-insn.h> |
| #include <asm/setup.h> |
| #include <asm/nmi.h> |
| #include <asm/export.h> |
| #include <asm/nospec-insn.h> |
| |
| __PT_R0 = __PT_GPRS |
| __PT_R1 = __PT_GPRS + 8 |
| __PT_R2 = __PT_GPRS + 16 |
| __PT_R3 = __PT_GPRS + 24 |
| __PT_R4 = __PT_GPRS + 32 |
| __PT_R5 = __PT_GPRS + 40 |
| __PT_R6 = __PT_GPRS + 48 |
| __PT_R7 = __PT_GPRS + 56 |
| __PT_R8 = __PT_GPRS + 64 |
| __PT_R9 = __PT_GPRS + 72 |
| __PT_R10 = __PT_GPRS + 80 |
| __PT_R11 = __PT_GPRS + 88 |
| __PT_R12 = __PT_GPRS + 96 |
| __PT_R13 = __PT_GPRS + 104 |
| __PT_R14 = __PT_GPRS + 112 |
| __PT_R15 = __PT_GPRS + 120 |
| |
| STACK_SHIFT = PAGE_SHIFT + THREAD_SIZE_ORDER |
| STACK_SIZE = 1 << STACK_SHIFT |
| STACK_INIT = STACK_SIZE - STACK_FRAME_OVERHEAD - __PT_SIZE |
| |
| _TIF_WORK = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ |
| _TIF_UPROBE | _TIF_GUARDED_STORAGE | _TIF_PATCH_PENDING) |
| _TIF_TRACE = (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \ |
| _TIF_SYSCALL_TRACEPOINT) |
| _CIF_WORK = (_CIF_MCCK_PENDING | _CIF_ASCE_PRIMARY | \ |
| _CIF_ASCE_SECONDARY | _CIF_FPU) |
| _PIF_WORK = (_PIF_PER_TRAP | _PIF_SYSCALL_RESTART) |
| |
| _LPP_OFFSET = __LC_LPP |
| |
| #define BASED(name) name-cleanup_critical(%r13) |
| |
| .macro TRACE_IRQS_ON |
| #ifdef CONFIG_TRACE_IRQFLAGS |
| basr %r2,%r0 |
| brasl %r14,trace_hardirqs_on_caller |
| #endif |
| .endm |
| |
| .macro TRACE_IRQS_OFF |
| #ifdef CONFIG_TRACE_IRQFLAGS |
| basr %r2,%r0 |
| brasl %r14,trace_hardirqs_off_caller |
| #endif |
| .endm |
| |
| .macro LOCKDEP_SYS_EXIT |
| #ifdef CONFIG_LOCKDEP |
| tm __PT_PSW+1(%r11),0x01 # returning to user ? |
| jz .+10 |
| brasl %r14,lockdep_sys_exit |
| #endif |
| .endm |
| |
| .macro CHECK_STACK stacksize,savearea |
| #ifdef CONFIG_CHECK_STACK |
| tml %r15,\stacksize - CONFIG_STACK_GUARD |
| lghi %r14,\savearea |
| jz stack_overflow |
| #endif |
| .endm |
| |
| .macro SWITCH_ASYNC savearea,timer |
| tmhh %r8,0x0001 # interrupting from user ? |
| jnz 1f |
| lgr %r14,%r9 |
| slg %r14,BASED(.Lcritical_start) |
| clg %r14,BASED(.Lcritical_length) |
| jhe 0f |
| lghi %r11,\savearea # inside critical section, do cleanup |
| brasl %r14,cleanup_critical |
| tmhh %r8,0x0001 # retest problem state after cleanup |
| jnz 1f |
| 0: lg %r14,__LC_ASYNC_STACK # are we already on the async stack? |
| slgr %r14,%r15 |
| srag %r14,%r14,STACK_SHIFT |
| jnz 2f |
| CHECK_STACK 1<<STACK_SHIFT,\savearea |
| aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) |
| j 3f |
| 1: UPDATE_VTIME %r14,%r15,\timer |
| BPENTER __TI_flags(%r12),_TIF_ISOLATE_BP |
| 2: lg %r15,__LC_ASYNC_STACK # load async stack |
| 3: la %r11,STACK_FRAME_OVERHEAD(%r15) |
| .endm |
| |
| .macro UPDATE_VTIME w1,w2,enter_timer |
| lg \w1,__LC_EXIT_TIMER |
| lg \w2,__LC_LAST_UPDATE_TIMER |
| slg \w1,\enter_timer |
| slg \w2,__LC_EXIT_TIMER |
| alg \w1,__LC_USER_TIMER |
| alg \w2,__LC_SYSTEM_TIMER |
| stg \w1,__LC_USER_TIMER |
| stg \w2,__LC_SYSTEM_TIMER |
| mvc __LC_LAST_UPDATE_TIMER(8),\enter_timer |
| .endm |
| |
| .macro REENABLE_IRQS |
| stg %r8,__LC_RETURN_PSW |
| ni __LC_RETURN_PSW,0xbf |
| ssm __LC_RETURN_PSW |
| .endm |
| |
| .macro STCK savearea |
| #ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES |
| .insn s,0xb27c0000,\savearea # store clock fast |
| #else |
| .insn s,0xb2050000,\savearea # store clock |
| #endif |
| .endm |
| |
| /* |
| * The TSTMSK macro generates a test-under-mask instruction by |
| * calculating the memory offset for the specified mask value. |
| * Mask value can be any constant. The macro shifts the mask |
| * value to calculate the memory offset for the test-under-mask |
| * instruction. |
| */ |
| .macro TSTMSK addr, mask, size=8, bytepos=0 |
| .if (\bytepos < \size) && (\mask >> 8) |
| .if (\mask & 0xff) |
| .error "Mask exceeds byte boundary" |
| .endif |
| TSTMSK \addr, "(\mask >> 8)", \size, "(\bytepos + 1)" |
| .exitm |
| .endif |
| .ifeq \mask |
| .error "Mask must not be zero" |
| .endif |
| off = \size - \bytepos - 1 |
| tm off+\addr, \mask |
| .endm |
| |
| .macro BPOFF |
| ALTERNATIVE "", ".long 0xb2e8c000", 82 |
| .endm |
| |
| .macro BPON |
| ALTERNATIVE "", ".long 0xb2e8d000", 82 |
| .endm |
| |
| .macro BPENTER tif_ptr,tif_mask |
| ALTERNATIVE "TSTMSK \tif_ptr,\tif_mask; jz .+8; .long 0xb2e8d000", \ |
| "", 82 |
| .endm |
| |
| .macro BPEXIT tif_ptr,tif_mask |
| TSTMSK \tif_ptr,\tif_mask |
| ALTERNATIVE "jz .+8; .long 0xb2e8c000", \ |
| "jnz .+8; .long 0xb2e8d000", 82 |
| .endm |
| |
| GEN_BR_THUNK %r9 |
| GEN_BR_THUNK %r14 |
| GEN_BR_THUNK %r14,%r11 |
| |
| .section .kprobes.text, "ax" |
| .Ldummy: |
| /* |
| * This nop exists only in order to avoid that __switch_to starts at |
| * the beginning of the kprobes text section. In that case we would |
| * have several symbols at the same address. E.g. objdump would take |
| * an arbitrary symbol name when disassembling this code. |
| * With the added nop in between the __switch_to symbol is unique |
| * again. |
| */ |
| nop 0 |
| |
| ENTRY(__bpon) |
| .globl __bpon |
| BPON |
| BR_EX %r14 |
| |
| /* |
| * Scheduler resume function, called by switch_to |
| * gpr2 = (task_struct *) prev |
| * gpr3 = (task_struct *) next |
| * Returns: |
| * gpr2 = prev |
| */ |
| ENTRY(__switch_to) |
| stmg %r6,%r15,__SF_GPRS(%r15) # store gprs of prev task |
| lghi %r4,__TASK_stack |
| lghi %r1,__TASK_thread |
| lg %r5,0(%r4,%r3) # start of kernel stack of next |
| stg %r15,__THREAD_ksp(%r1,%r2) # store kernel stack of prev |
| lgr %r15,%r5 |
| aghi %r15,STACK_INIT # end of kernel stack of next |
| stg %r3,__LC_CURRENT # store task struct of next |
| stg %r15,__LC_KERNEL_STACK # store end of kernel stack |
| lg %r15,__THREAD_ksp(%r1,%r3) # load kernel stack of next |
| aghi %r3,__TASK_pid |
| mvc __LC_CURRENT_PID(4,%r0),0(%r3) # store pid of next |
| lmg %r6,%r15,__SF_GPRS(%r15) # load gprs of next task |
| ALTERNATIVE "", ".insn s,0xb2800000,_LPP_OFFSET", 40 |
| BR_EX %r14 |
| |
| .L__critical_start: |
| |
| #if IS_ENABLED(CONFIG_KVM) |
| /* |
| * sie64a calling convention: |
| * %r2 pointer to sie control block |
| * %r3 guest register save area |
| */ |
| ENTRY(sie64a) |
| stmg %r6,%r14,__SF_GPRS(%r15) # save kernel registers |
| lg %r12,__LC_CURRENT |
| stg %r2,__SF_SIE_CONTROL(%r15) # save control block pointer |
| stg %r3,__SF_SIE_SAVEAREA(%r15) # save guest register save area |
| xc __SF_SIE_REASON(8,%r15),__SF_SIE_REASON(%r15) # reason code = 0 |
| mvc __SF_SIE_FLAGS(8,%r15),__TI_flags(%r12) # copy thread flags |
| TSTMSK __LC_CPU_FLAGS,_CIF_FPU # load guest fp/vx registers ? |
| jno .Lsie_load_guest_gprs |
| brasl %r14,load_fpu_regs # load guest fp/vx regs |
| .Lsie_load_guest_gprs: |
| lmg %r0,%r13,0(%r3) # load guest gprs 0-13 |
| lg %r14,__LC_GMAP # get gmap pointer |
| ltgr %r14,%r14 |
| jz .Lsie_gmap |
| lctlg %c1,%c1,__GMAP_ASCE(%r14) # load primary asce |
| .Lsie_gmap: |
| lg %r14,__SF_SIE_CONTROL(%r15) # get control block pointer |
| oi __SIE_PROG0C+3(%r14),1 # we are going into SIE now |
| tm __SIE_PROG20+3(%r14),3 # last exit... |
| jnz .Lsie_skip |
| TSTMSK __LC_CPU_FLAGS,_CIF_FPU |
| jo .Lsie_skip # exit if fp/vx regs changed |
| BPEXIT __SF_SIE_FLAGS(%r15),(_TIF_ISOLATE_BP|_TIF_ISOLATE_BP_GUEST) |
| .Lsie_entry: |
| sie 0(%r14) |
| .Lsie_exit: |
| BPOFF |
| BPENTER __SF_SIE_FLAGS(%r15),(_TIF_ISOLATE_BP|_TIF_ISOLATE_BP_GUEST) |
| .Lsie_skip: |
| ni __SIE_PROG0C+3(%r14),0xfe # no longer in SIE |
| lctlg %c1,%c1,__LC_USER_ASCE # load primary asce |
| .Lsie_done: |
| # some program checks are suppressing. C code (e.g. do_protection_exception) |
| # will rewind the PSW by the ILC, which is often 4 bytes in case of SIE. There |
| # are some corner cases (e.g. runtime instrumentation) where ILC is unpredictable. |
| # Other instructions between sie64a and .Lsie_done should not cause program |
| # interrupts. So lets use 3 nops as a landing pad for all possible rewinds. |
| # See also .Lcleanup_sie |
| .Lrewind_pad6: |
| nopr 7 |
| .Lrewind_pad4: |
| nopr 7 |
| .Lrewind_pad2: |
| nopr 7 |
| .globl sie_exit |
| sie_exit: |
| lg %r14,__SF_SIE_SAVEAREA(%r15) # load guest register save area |
| stmg %r0,%r13,0(%r14) # save guest gprs 0-13 |
| xgr %r0,%r0 # clear guest registers to |
| xgr %r1,%r1 # prevent speculative use |
| xgr %r2,%r2 |
| xgr %r3,%r3 |
| xgr %r4,%r4 |
| xgr %r5,%r5 |
| lmg %r6,%r14,__SF_GPRS(%r15) # restore kernel registers |
| lg %r2,__SF_SIE_REASON(%r15) # return exit reason code |
| BR_EX %r14 |
| .Lsie_fault: |
| lghi %r14,-EFAULT |
| stg %r14,__SF_SIE_REASON(%r15) # set exit reason code |
| j sie_exit |
| |
| EX_TABLE(.Lrewind_pad6,.Lsie_fault) |
| EX_TABLE(.Lrewind_pad4,.Lsie_fault) |
| EX_TABLE(.Lrewind_pad2,.Lsie_fault) |
| EX_TABLE(sie_exit,.Lsie_fault) |
| EXPORT_SYMBOL(sie64a) |
| EXPORT_SYMBOL(sie_exit) |
| #endif |
| |
| /* |
| * SVC interrupt handler routine. System calls are synchronous events and |
| * are executed with interrupts enabled. |
| */ |
| |
| ENTRY(system_call) |
| stpt __LC_SYNC_ENTER_TIMER |
| .Lsysc_stmg: |
| stmg %r8,%r15,__LC_SAVE_AREA_SYNC |
| BPOFF |
| lg %r12,__LC_CURRENT |
| lghi %r13,__TASK_thread |
| lghi %r14,_PIF_SYSCALL |
| .Lsysc_per: |
| lg %r15,__LC_KERNEL_STACK |
| la %r11,STACK_FRAME_OVERHEAD(%r15) # pointer to pt_regs |
| .Lsysc_vtime: |
| UPDATE_VTIME %r8,%r9,__LC_SYNC_ENTER_TIMER |
| BPENTER __TI_flags(%r12),_TIF_ISOLATE_BP |
| stmg %r0,%r7,__PT_R0(%r11) |
| mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC |
| mvc __PT_PSW(16,%r11),__LC_SVC_OLD_PSW |
| mvc __PT_INT_CODE(4,%r11),__LC_SVC_ILC |
| stg %r14,__PT_FLAGS(%r11) |
| .Lsysc_do_svc: |
| # clear user controlled register to prevent speculative use |
| xgr %r0,%r0 |
| # load address of system call table |
| lg %r10,__THREAD_sysc_table(%r13,%r12) |
| llgh %r8,__PT_INT_CODE+2(%r11) |
| slag %r8,%r8,2 # shift and test for svc 0 |
| jnz .Lsysc_nr_ok |
| # svc 0: system call number in %r1 |
| llgfr %r1,%r1 # clear high word in r1 |
| cghi %r1,NR_syscalls |
| jnl .Lsysc_nr_ok |
| sth %r1,__PT_INT_CODE+2(%r11) |
| slag %r8,%r1,2 |
| .Lsysc_nr_ok: |
| xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
| stg %r2,__PT_ORIG_GPR2(%r11) |
| stg %r7,STACK_FRAME_OVERHEAD(%r15) |
| lgf %r9,0(%r8,%r10) # get system call add. |
| TSTMSK __TI_flags(%r12),_TIF_TRACE |
| jnz .Lsysc_tracesys |
| BASR_EX %r14,%r9 # call sys_xxxx |
| stg %r2,__PT_R2(%r11) # store return value |
| |
| .Lsysc_return: |
| #ifdef CONFIG_DEBUG_RSEQ |
| lgr %r2,%r11 |
| brasl %r14,rseq_syscall |
| #endif |
| LOCKDEP_SYS_EXIT |
| .Lsysc_tif: |
| TSTMSK __PT_FLAGS(%r11),_PIF_WORK |
| jnz .Lsysc_work |
| TSTMSK __TI_flags(%r12),_TIF_WORK |
| jnz .Lsysc_work # check for work |
| TSTMSK __LC_CPU_FLAGS,_CIF_WORK |
| jnz .Lsysc_work |
| BPEXIT __TI_flags(%r12),_TIF_ISOLATE_BP |
| .Lsysc_restore: |
| lg %r14,__LC_VDSO_PER_CPU |
| lmg %r0,%r10,__PT_R0(%r11) |
| mvc __LC_RETURN_PSW(16),__PT_PSW(%r11) |
| .Lsysc_exit_timer: |
| stpt __LC_EXIT_TIMER |
| mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER |
| lmg %r11,%r15,__PT_R11(%r11) |
| lpswe __LC_RETURN_PSW |
| .Lsysc_done: |
| |
| # |
| # One of the work bits is on. Find out which one. |
| # |
| .Lsysc_work: |
| TSTMSK __LC_CPU_FLAGS,_CIF_MCCK_PENDING |
| jo .Lsysc_mcck_pending |
| TSTMSK __TI_flags(%r12),_TIF_NEED_RESCHED |
| jo .Lsysc_reschedule |
| TSTMSK __PT_FLAGS(%r11),_PIF_SYSCALL_RESTART |
| jo .Lsysc_syscall_restart |
| #ifdef CONFIG_UPROBES |
| TSTMSK __TI_flags(%r12),_TIF_UPROBE |
| jo .Lsysc_uprobe_notify |
| #endif |
| TSTMSK __TI_flags(%r12),_TIF_GUARDED_STORAGE |
| jo .Lsysc_guarded_storage |
| TSTMSK __PT_FLAGS(%r11),_PIF_PER_TRAP |
| jo .Lsysc_singlestep |
| #ifdef CONFIG_LIVEPATCH |
| TSTMSK __TI_flags(%r12),_TIF_PATCH_PENDING |
| jo .Lsysc_patch_pending # handle live patching just before |
| # signals and possible syscall restart |
| #endif |
| TSTMSK __PT_FLAGS(%r11),_PIF_SYSCALL_RESTART |
| jo .Lsysc_syscall_restart |
| TSTMSK __TI_flags(%r12),_TIF_SIGPENDING |
| jo .Lsysc_sigpending |
| TSTMSK __TI_flags(%r12),_TIF_NOTIFY_RESUME |
| jo .Lsysc_notify_resume |
| TSTMSK __LC_CPU_FLAGS,_CIF_FPU |
| jo .Lsysc_vxrs |
| TSTMSK __LC_CPU_FLAGS,(_CIF_ASCE_PRIMARY|_CIF_ASCE_SECONDARY) |
| jnz .Lsysc_asce |
| j .Lsysc_return # beware of critical section cleanup |
| |
| # |
| # _TIF_NEED_RESCHED is set, call schedule |
| # |
| .Lsysc_reschedule: |
| larl %r14,.Lsysc_return |
| jg schedule |
| |
| # |
| # _CIF_MCCK_PENDING is set, call handler |
| # |
| .Lsysc_mcck_pending: |
| larl %r14,.Lsysc_return |
| jg s390_handle_mcck # TIF bit will be cleared by handler |
| |
| # |
| # _CIF_ASCE_PRIMARY and/or _CIF_ASCE_SECONDARY set, load user space asce |
| # |
| .Lsysc_asce: |
| ni __LC_CPU_FLAGS+7,255-_CIF_ASCE_SECONDARY |
| lctlg %c7,%c7,__LC_VDSO_ASCE # load secondary asce |
| TSTMSK __LC_CPU_FLAGS,_CIF_ASCE_PRIMARY |
| jz .Lsysc_return |
| #ifndef CONFIG_HAVE_MARCH_Z10_FEATURES |
| tm __LC_STFLE_FAC_LIST+3,0x10 # has MVCOS ? |
| jnz .Lsysc_set_fs_fixup |
| ni __LC_CPU_FLAGS+7,255-_CIF_ASCE_PRIMARY |
| lctlg %c1,%c1,__LC_USER_ASCE # load primary asce |
| j .Lsysc_return |
| .Lsysc_set_fs_fixup: |
| #endif |
| larl %r14,.Lsysc_return |
| jg set_fs_fixup |
| |
| # |
| # CIF_FPU is set, restore floating-point controls and floating-point registers. |
| # |
| .Lsysc_vxrs: |
| larl %r14,.Lsysc_return |
| jg load_fpu_regs |
| |
| # |
| # _TIF_SIGPENDING is set, call do_signal |
| # |
| .Lsysc_sigpending: |
| lgr %r2,%r11 # pass pointer to pt_regs |
| brasl %r14,do_signal |
| TSTMSK __PT_FLAGS(%r11),_PIF_SYSCALL |
| jno .Lsysc_return |
| .Lsysc_do_syscall: |
| lghi %r13,__TASK_thread |
| lmg %r2,%r7,__PT_R2(%r11) # load svc arguments |
| lghi %r1,0 # svc 0 returns -ENOSYS |
| j .Lsysc_do_svc |
| |
| # |
| # _TIF_NOTIFY_RESUME is set, call do_notify_resume |
| # |
| .Lsysc_notify_resume: |
| lgr %r2,%r11 # pass pointer to pt_regs |
| larl %r14,.Lsysc_return |
| jg do_notify_resume |
| |
| # |
| # _TIF_UPROBE is set, call uprobe_notify_resume |
| # |
| #ifdef CONFIG_UPROBES |
| .Lsysc_uprobe_notify: |
| lgr %r2,%r11 # pass pointer to pt_regs |
| larl %r14,.Lsysc_return |
| jg uprobe_notify_resume |
| #endif |
| |
| # |
| # _TIF_GUARDED_STORAGE is set, call guarded_storage_load |
| # |
| .Lsysc_guarded_storage: |
| lgr %r2,%r11 # pass pointer to pt_regs |
| larl %r14,.Lsysc_return |
| jg gs_load_bc_cb |
| # |
| # _TIF_PATCH_PENDING is set, call klp_update_patch_state |
| # |
| #ifdef CONFIG_LIVEPATCH |
| .Lsysc_patch_pending: |
| lg %r2,__LC_CURRENT # pass pointer to task struct |
| larl %r14,.Lsysc_return |
| jg klp_update_patch_state |
| #endif |
| |
| # |
| # _PIF_PER_TRAP is set, call do_per_trap |
| # |
| .Lsysc_singlestep: |
| ni __PT_FLAGS+7(%r11),255-_PIF_PER_TRAP |
| lgr %r2,%r11 # pass pointer to pt_regs |
| larl %r14,.Lsysc_return |
| jg do_per_trap |
| |
| # |
| # _PIF_SYSCALL_RESTART is set, repeat the current system call |
| # |
| .Lsysc_syscall_restart: |
| ni __PT_FLAGS+7(%r11),255-_PIF_SYSCALL_RESTART |
| lmg %r1,%r7,__PT_R1(%r11) # load svc arguments |
| lg %r2,__PT_ORIG_GPR2(%r11) |
| j .Lsysc_do_svc |
| |
| # |
| # call tracehook_report_syscall_entry/tracehook_report_syscall_exit before |
| # and after the system call |
| # |
| .Lsysc_tracesys: |
| lgr %r2,%r11 # pass pointer to pt_regs |
| la %r3,0 |
| llgh %r0,__PT_INT_CODE+2(%r11) |
| stg %r0,__PT_R2(%r11) |
| brasl %r14,do_syscall_trace_enter |
| lghi %r0,NR_syscalls |
| clgr %r0,%r2 |
| jnh .Lsysc_tracenogo |
| sllg %r8,%r2,2 |
| lgf %r9,0(%r8,%r10) |
| .Lsysc_tracego: |
| lmg %r3,%r7,__PT_R3(%r11) |
| stg %r7,STACK_FRAME_OVERHEAD(%r15) |
| lg %r2,__PT_ORIG_GPR2(%r11) |
| BASR_EX %r14,%r9 # call sys_xxx |
| stg %r2,__PT_R2(%r11) # store return value |
| .Lsysc_tracenogo: |
| TSTMSK __TI_flags(%r12),_TIF_TRACE |
| jz .Lsysc_return |
| lgr %r2,%r11 # pass pointer to pt_regs |
| larl %r14,.Lsysc_return |
| jg do_syscall_trace_exit |
| |
| # |
| # a new process exits the kernel with ret_from_fork |
| # |
| ENTRY(ret_from_fork) |
| la %r11,STACK_FRAME_OVERHEAD(%r15) |
| lg %r12,__LC_CURRENT |
| brasl %r14,schedule_tail |
| TRACE_IRQS_ON |
| ssm __LC_SVC_NEW_PSW # reenable interrupts |
| tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ? |
| jne .Lsysc_tracenogo |
| # it's a kernel thread |
| lmg %r9,%r10,__PT_R9(%r11) # load gprs |
| ENTRY(kernel_thread_starter) |
| la %r2,0(%r10) |
| BASR_EX %r14,%r9 |
| j .Lsysc_tracenogo |
| |
| /* |
| * Program check handler routine |
| */ |
| |
| ENTRY(pgm_check_handler) |
| stpt __LC_SYNC_ENTER_TIMER |
| BPOFF |
| stmg %r8,%r15,__LC_SAVE_AREA_SYNC |
| lg %r10,__LC_LAST_BREAK |
| lg %r12,__LC_CURRENT |
| lghi %r11,0 |
| larl %r13,cleanup_critical |
| lmg %r8,%r9,__LC_PGM_OLD_PSW |
| tmhh %r8,0x0001 # test problem state bit |
| jnz 2f # -> fault in user space |
| #if IS_ENABLED(CONFIG_KVM) |
| # cleanup critical section for program checks in sie64a |
| lgr %r14,%r9 |
| slg %r14,BASED(.Lsie_critical_start) |
| clg %r14,BASED(.Lsie_critical_length) |
| jhe 0f |
| lg %r14,__SF_SIE_CONTROL(%r15) # get control block pointer |
| ni __SIE_PROG0C+3(%r14),0xfe # no longer in SIE |
| lctlg %c1,%c1,__LC_USER_ASCE # load primary asce |
| larl %r9,sie_exit # skip forward to sie_exit |
| lghi %r11,_PIF_GUEST_FAULT |
| #endif |
| 0: tmhh %r8,0x4000 # PER bit set in old PSW ? |
| jnz 1f # -> enabled, can't be a double fault |
| tm __LC_PGM_ILC+3,0x80 # check for per exception |
| jnz .Lpgm_svcper # -> single stepped svc |
| 1: CHECK_STACK STACK_SIZE,__LC_SAVE_AREA_SYNC |
| aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) |
| j 4f |
| 2: UPDATE_VTIME %r14,%r15,__LC_SYNC_ENTER_TIMER |
| BPENTER __TI_flags(%r12),_TIF_ISOLATE_BP |
| lg %r15,__LC_KERNEL_STACK |
| lgr %r14,%r12 |
| aghi %r14,__TASK_thread # pointer to thread_struct |
| lghi %r13,__LC_PGM_TDB |
| tm __LC_PGM_ILC+2,0x02 # check for transaction abort |
| jz 3f |
| mvc __THREAD_trap_tdb(256,%r14),0(%r13) |
| 3: stg %r10,__THREAD_last_break(%r14) |
| 4: lgr %r13,%r11 |
| la %r11,STACK_FRAME_OVERHEAD(%r15) |
| stmg %r0,%r7,__PT_R0(%r11) |
| # clear user controlled registers to prevent speculative use |
| xgr %r0,%r0 |
| xgr %r1,%r1 |
| xgr %r2,%r2 |
| xgr %r3,%r3 |
| xgr %r4,%r4 |
| xgr %r5,%r5 |
| xgr %r6,%r6 |
| xgr %r7,%r7 |
| mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC |
| stmg %r8,%r9,__PT_PSW(%r11) |
| mvc __PT_INT_CODE(4,%r11),__LC_PGM_ILC |
| mvc __PT_INT_PARM_LONG(8,%r11),__LC_TRANS_EXC_CODE |
| stg %r13,__PT_FLAGS(%r11) |
| stg %r10,__PT_ARGS(%r11) |
| tm __LC_PGM_ILC+3,0x80 # check for per exception |
| jz 5f |
| tmhh %r8,0x0001 # kernel per event ? |
| jz .Lpgm_kprobe |
| oi __PT_FLAGS+7(%r11),_PIF_PER_TRAP |
| mvc __THREAD_per_address(8,%r14),__LC_PER_ADDRESS |
| mvc __THREAD_per_cause(2,%r14),__LC_PER_CODE |
| mvc __THREAD_per_paid(1,%r14),__LC_PER_ACCESS_ID |
| 5: REENABLE_IRQS |
| xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
| larl %r1,pgm_check_table |
| llgh %r10,__PT_INT_CODE+2(%r11) |
| nill %r10,0x007f |
| sll %r10,2 |
| je .Lpgm_return |
| lgf %r9,0(%r10,%r1) # load address of handler routine |
| lgr %r2,%r11 # pass pointer to pt_regs |
| BASR_EX %r14,%r9 # branch to interrupt-handler |
| .Lpgm_return: |
| LOCKDEP_SYS_EXIT |
| tm __PT_PSW+1(%r11),0x01 # returning to user ? |
| jno .Lsysc_restore |
| TSTMSK __PT_FLAGS(%r11),_PIF_SYSCALL |
| jo .Lsysc_do_syscall |
| j .Lsysc_tif |
| |
| # |
| # PER event in supervisor state, must be kprobes |
| # |
| .Lpgm_kprobe: |
| REENABLE_IRQS |
| xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
| lgr %r2,%r11 # pass pointer to pt_regs |
| brasl %r14,do_per_trap |
| j .Lpgm_return |
| |
| # |
| # single stepped system call |
| # |
| .Lpgm_svcper: |
| mvc __LC_RETURN_PSW(8),__LC_SVC_NEW_PSW |
| lghi %r13,__TASK_thread |
| larl %r14,.Lsysc_per |
| stg %r14,__LC_RETURN_PSW+8 |
| lghi %r14,_PIF_SYSCALL | _PIF_PER_TRAP |
| lpswe __LC_RETURN_PSW # branch to .Lsysc_per and enable irqs |
| |
| /* |
| * IO interrupt handler routine |
| */ |
| ENTRY(io_int_handler) |
| STCK __LC_INT_CLOCK |
| stpt __LC_ASYNC_ENTER_TIMER |
| BPOFF |
| stmg %r8,%r15,__LC_SAVE_AREA_ASYNC |
| lg %r12,__LC_CURRENT |
| larl %r13,cleanup_critical |
| lmg %r8,%r9,__LC_IO_OLD_PSW |
| SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_ENTER_TIMER |
| stmg %r0,%r7,__PT_R0(%r11) |
| # clear user controlled registers to prevent speculative use |
| xgr %r0,%r0 |
| xgr %r1,%r1 |
| xgr %r2,%r2 |
| xgr %r3,%r3 |
| xgr %r4,%r4 |
| xgr %r5,%r5 |
| xgr %r6,%r6 |
| xgr %r7,%r7 |
| xgr %r10,%r10 |
| mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC |
| stmg %r8,%r9,__PT_PSW(%r11) |
| mvc __PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID |
| xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11) |
| TSTMSK __LC_CPU_FLAGS,_CIF_IGNORE_IRQ |
| jo .Lio_restore |
| TRACE_IRQS_OFF |
| xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
| .Lio_loop: |
| lgr %r2,%r11 # pass pointer to pt_regs |
| lghi %r3,IO_INTERRUPT |
| tm __PT_INT_CODE+8(%r11),0x80 # adapter interrupt ? |
| jz .Lio_call |
| lghi %r3,THIN_INTERRUPT |
| .Lio_call: |
| brasl %r14,do_IRQ |
| TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_LPAR |
| jz .Lio_return |
| tpi 0 |
| jz .Lio_return |
| mvc __PT_INT_CODE(12,%r11),__LC_SUBCHANNEL_ID |
| j .Lio_loop |
| .Lio_return: |
| LOCKDEP_SYS_EXIT |
| TRACE_IRQS_ON |
| .Lio_tif: |
| TSTMSK __TI_flags(%r12),_TIF_WORK |
| jnz .Lio_work # there is work to do (signals etc.) |
| TSTMSK __LC_CPU_FLAGS,_CIF_WORK |
| jnz .Lio_work |
| .Lio_restore: |
| lg %r14,__LC_VDSO_PER_CPU |
| lmg %r0,%r10,__PT_R0(%r11) |
| mvc __LC_RETURN_PSW(16),__PT_PSW(%r11) |
| tm __PT_PSW+1(%r11),0x01 # returning to user ? |
| jno .Lio_exit_kernel |
| BPEXIT __TI_flags(%r12),_TIF_ISOLATE_BP |
| .Lio_exit_timer: |
| stpt __LC_EXIT_TIMER |
| mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER |
| .Lio_exit_kernel: |
| lmg %r11,%r15,__PT_R11(%r11) |
| lpswe __LC_RETURN_PSW |
| .Lio_done: |
| |
| # |
| # There is work todo, find out in which context we have been interrupted: |
| # 1) if we return to user space we can do all _TIF_WORK work |
| # 2) if we return to kernel code and kvm is enabled check if we need to |
| # modify the psw to leave SIE |
| # 3) if we return to kernel code and preemptive scheduling is enabled check |
| # the preemption counter and if it is zero call preempt_schedule_irq |
| # Before any work can be done, a switch to the kernel stack is required. |
| # |
| .Lio_work: |
| tm __PT_PSW+1(%r11),0x01 # returning to user ? |
| jo .Lio_work_user # yes -> do resched & signal |
| #ifdef CONFIG_PREEMPT |
| # check for preemptive scheduling |
| icm %r0,15,__LC_PREEMPT_COUNT |
| jnz .Lio_restore # preemption is disabled |
| TSTMSK __TI_flags(%r12),_TIF_NEED_RESCHED |
| jno .Lio_restore |
| # switch to kernel stack |
| lg %r1,__PT_R15(%r11) |
| aghi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE) |
| mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) |
| xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) |
| la %r11,STACK_FRAME_OVERHEAD(%r1) |
| lgr %r15,%r1 |
| # TRACE_IRQS_ON already done at .Lio_return, call |
| # TRACE_IRQS_OFF to keep things symmetrical |
| TRACE_IRQS_OFF |
| brasl %r14,preempt_schedule_irq |
| j .Lio_return |
| #else |
| j .Lio_restore |
| #endif |
| |
| # |
| # Need to do work before returning to userspace, switch to kernel stack |
| # |
| .Lio_work_user: |
| lg %r1,__LC_KERNEL_STACK |
| mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) |
| xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) |
| la %r11,STACK_FRAME_OVERHEAD(%r1) |
| lgr %r15,%r1 |
| |
| # |
| # One of the work bits is on. Find out which one. |
| # |
| .Lio_work_tif: |
| TSTMSK __LC_CPU_FLAGS,_CIF_MCCK_PENDING |
| jo .Lio_mcck_pending |
| TSTMSK __TI_flags(%r12),_TIF_NEED_RESCHED |
| jo .Lio_reschedule |
| #ifdef CONFIG_LIVEPATCH |
| TSTMSK __TI_flags(%r12),_TIF_PATCH_PENDING |
| jo .Lio_patch_pending |
| #endif |
| TSTMSK __TI_flags(%r12),_TIF_SIGPENDING |
| jo .Lio_sigpending |
| TSTMSK __TI_flags(%r12),_TIF_NOTIFY_RESUME |
| jo .Lio_notify_resume |
| TSTMSK __TI_flags(%r12),_TIF_GUARDED_STORAGE |
| jo .Lio_guarded_storage |
| TSTMSK __LC_CPU_FLAGS,_CIF_FPU |
| jo .Lio_vxrs |
| TSTMSK __LC_CPU_FLAGS,(_CIF_ASCE_PRIMARY|_CIF_ASCE_SECONDARY) |
| jnz .Lio_asce |
| j .Lio_return # beware of critical section cleanup |
| |
| # |
| # _CIF_MCCK_PENDING is set, call handler |
| # |
| .Lio_mcck_pending: |
| # TRACE_IRQS_ON already done at .Lio_return |
| brasl %r14,s390_handle_mcck # TIF bit will be cleared by handler |
| TRACE_IRQS_OFF |
| j .Lio_return |
| |
| # |
| # _CIF_ASCE_PRIMARY and/or CIF_ASCE_SECONDARY set, load user space asce |
| # |
| .Lio_asce: |
| ni __LC_CPU_FLAGS+7,255-_CIF_ASCE_SECONDARY |
| lctlg %c7,%c7,__LC_VDSO_ASCE # load secondary asce |
| TSTMSK __LC_CPU_FLAGS,_CIF_ASCE_PRIMARY |
| jz .Lio_return |
| #ifndef CONFIG_HAVE_MARCH_Z10_FEATURES |
| tm __LC_STFLE_FAC_LIST+3,0x10 # has MVCOS ? |
| jnz .Lio_set_fs_fixup |
| ni __LC_CPU_FLAGS+7,255-_CIF_ASCE_PRIMARY |
| lctlg %c1,%c1,__LC_USER_ASCE # load primary asce |
| j .Lio_return |
| .Lio_set_fs_fixup: |
| #endif |
| larl %r14,.Lio_return |
| jg set_fs_fixup |
| |
| # |
| # CIF_FPU is set, restore floating-point controls and floating-point registers. |
| # |
| .Lio_vxrs: |
| larl %r14,.Lio_return |
| jg load_fpu_regs |
| |
| # |
| # _TIF_GUARDED_STORAGE is set, call guarded_storage_load |
| # |
| .Lio_guarded_storage: |
| # TRACE_IRQS_ON already done at .Lio_return |
| ssm __LC_SVC_NEW_PSW # reenable interrupts |
| lgr %r2,%r11 # pass pointer to pt_regs |
| brasl %r14,gs_load_bc_cb |
| ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts |
| TRACE_IRQS_OFF |
| j .Lio_return |
| |
| # |
| # _TIF_NEED_RESCHED is set, call schedule |
| # |
| .Lio_reschedule: |
| # TRACE_IRQS_ON already done at .Lio_return |
| ssm __LC_SVC_NEW_PSW # reenable interrupts |
| brasl %r14,schedule # call scheduler |
| ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts |
| TRACE_IRQS_OFF |
| j .Lio_return |
| |
| # |
| # _TIF_PATCH_PENDING is set, call klp_update_patch_state |
| # |
| #ifdef CONFIG_LIVEPATCH |
| .Lio_patch_pending: |
| lg %r2,__LC_CURRENT # pass pointer to task struct |
| larl %r14,.Lio_return |
| jg klp_update_patch_state |
| #endif |
| |
| # |
| # _TIF_SIGPENDING or is set, call do_signal |
| # |
| .Lio_sigpending: |
| # TRACE_IRQS_ON already done at .Lio_return |
| ssm __LC_SVC_NEW_PSW # reenable interrupts |
| lgr %r2,%r11 # pass pointer to pt_regs |
| brasl %r14,do_signal |
| ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts |
| TRACE_IRQS_OFF |
| j .Lio_return |
| |
| # |
| # _TIF_NOTIFY_RESUME or is set, call do_notify_resume |
| # |
| .Lio_notify_resume: |
| # TRACE_IRQS_ON already done at .Lio_return |
| ssm __LC_SVC_NEW_PSW # reenable interrupts |
| lgr %r2,%r11 # pass pointer to pt_regs |
| brasl %r14,do_notify_resume |
| ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts |
| TRACE_IRQS_OFF |
| j .Lio_return |
| |
| /* |
| * External interrupt handler routine |
| */ |
| ENTRY(ext_int_handler) |
| STCK __LC_INT_CLOCK |
| stpt __LC_ASYNC_ENTER_TIMER |
| BPOFF |
| stmg %r8,%r15,__LC_SAVE_AREA_ASYNC |
| lg %r12,__LC_CURRENT |
| larl %r13,cleanup_critical |
| lmg %r8,%r9,__LC_EXT_OLD_PSW |
| SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_ENTER_TIMER |
| stmg %r0,%r7,__PT_R0(%r11) |
| # clear user controlled registers to prevent speculative use |
| xgr %r0,%r0 |
| xgr %r1,%r1 |
| xgr %r2,%r2 |
| xgr %r3,%r3 |
| xgr %r4,%r4 |
| xgr %r5,%r5 |
| xgr %r6,%r6 |
| xgr %r7,%r7 |
| xgr %r10,%r10 |
| mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC |
| stmg %r8,%r9,__PT_PSW(%r11) |
| lghi %r1,__LC_EXT_PARAMS2 |
| mvc __PT_INT_CODE(4,%r11),__LC_EXT_CPU_ADDR |
| mvc __PT_INT_PARM(4,%r11),__LC_EXT_PARAMS |
| mvc __PT_INT_PARM_LONG(8,%r11),0(%r1) |
| xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11) |
| TSTMSK __LC_CPU_FLAGS,_CIF_IGNORE_IRQ |
| jo .Lio_restore |
| TRACE_IRQS_OFF |
| xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
| lgr %r2,%r11 # pass pointer to pt_regs |
| lghi %r3,EXT_INTERRUPT |
| brasl %r14,do_IRQ |
| j .Lio_return |
| |
| /* |
| * Load idle PSW. The second "half" of this function is in .Lcleanup_idle. |
| */ |
| ENTRY(psw_idle) |
| stg %r3,__SF_EMPTY(%r15) |
| larl %r1,.Lpsw_idle_lpsw+4 |
| stg %r1,__SF_EMPTY+8(%r15) |
| #ifdef CONFIG_SMP |
| larl %r1,smp_cpu_mtid |
| llgf %r1,0(%r1) |
| ltgr %r1,%r1 |
| jz .Lpsw_idle_stcctm |
| .insn rsy,0xeb0000000017,%r1,5,__SF_EMPTY+16(%r15) |
| .Lpsw_idle_stcctm: |
| #endif |
| oi __LC_CPU_FLAGS+7,_CIF_ENABLED_WAIT |
| BPON |
| STCK __CLOCK_IDLE_ENTER(%r2) |
| stpt __TIMER_IDLE_ENTER(%r2) |
| .Lpsw_idle_lpsw: |
| lpswe __SF_EMPTY(%r15) |
| BR_EX %r14 |
| .Lpsw_idle_end: |
| |
| /* |
| * Store floating-point controls and floating-point or vector register |
| * depending whether the vector facility is available. A critical section |
| * cleanup assures that the registers are stored even if interrupted for |
| * some other work. The CIF_FPU flag is set to trigger a lazy restore |
| * of the register contents at return from io or a system call. |
| */ |
| ENTRY(save_fpu_regs) |
| lg %r2,__LC_CURRENT |
| aghi %r2,__TASK_thread |
| TSTMSK __LC_CPU_FLAGS,_CIF_FPU |
| jo .Lsave_fpu_regs_exit |
| stfpc __THREAD_FPU_fpc(%r2) |
| lg %r3,__THREAD_FPU_regs(%r2) |
| TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_VX |
| jz .Lsave_fpu_regs_fp # no -> store FP regs |
| VSTM %v0,%v15,0,%r3 # vstm 0,15,0(3) |
| VSTM %v16,%v31,256,%r3 # vstm 16,31,256(3) |
| j .Lsave_fpu_regs_done # -> set CIF_FPU flag |
| .Lsave_fpu_regs_fp: |
| std 0,0(%r3) |
| std 1,8(%r3) |
| std 2,16(%r3) |
| std 3,24(%r3) |
| std 4,32(%r3) |
| std 5,40(%r3) |
| std 6,48(%r3) |
| std 7,56(%r3) |
| std 8,64(%r3) |
| std 9,72(%r3) |
| std 10,80(%r3) |
| std 11,88(%r3) |
| std 12,96(%r3) |
| std 13,104(%r3) |
| std 14,112(%r3) |
| std 15,120(%r3) |
| .Lsave_fpu_regs_done: |
| oi __LC_CPU_FLAGS+7,_CIF_FPU |
| .Lsave_fpu_regs_exit: |
| BR_EX %r14 |
| .Lsave_fpu_regs_end: |
| EXPORT_SYMBOL(save_fpu_regs) |
| |
| /* |
| * Load floating-point controls and floating-point or vector registers. |
| * A critical section cleanup assures that the register contents are |
| * loaded even if interrupted for some other work. |
| * |
| * There are special calling conventions to fit into sysc and io return work: |
| * %r15: <kernel stack> |
| * The function requires: |
| * %r4 |
| */ |
| load_fpu_regs: |
| lg %r4,__LC_CURRENT |
| aghi %r4,__TASK_thread |
| TSTMSK __LC_CPU_FLAGS,_CIF_FPU |
| jno .Lload_fpu_regs_exit |
| lfpc __THREAD_FPU_fpc(%r4) |
| TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_VX |
| lg %r4,__THREAD_FPU_regs(%r4) # %r4 <- reg save area |
| jz .Lload_fpu_regs_fp # -> no VX, load FP regs |
| VLM %v0,%v15,0,%r4 |
| VLM %v16,%v31,256,%r4 |
| j .Lload_fpu_regs_done |
| .Lload_fpu_regs_fp: |
| ld 0,0(%r4) |
| ld 1,8(%r4) |
| ld 2,16(%r4) |
| ld 3,24(%r4) |
| ld 4,32(%r4) |
| ld 5,40(%r4) |
| ld 6,48(%r4) |
| ld 7,56(%r4) |
| ld 8,64(%r4) |
| ld 9,72(%r4) |
| ld 10,80(%r4) |
| ld 11,88(%r4) |
| ld 12,96(%r4) |
| ld 13,104(%r4) |
| ld 14,112(%r4) |
| ld 15,120(%r4) |
| .Lload_fpu_regs_done: |
| ni __LC_CPU_FLAGS+7,255-_CIF_FPU |
| .Lload_fpu_regs_exit: |
| BR_EX %r14 |
| .Lload_fpu_regs_end: |
| |
| .L__critical_end: |
| |
| /* |
| * Machine check handler routines |
| */ |
| ENTRY(mcck_int_handler) |
| STCK __LC_MCCK_CLOCK |
| BPOFF |
| la %r1,4095 # validate r1 |
| spt __LC_CPU_TIMER_SAVE_AREA-4095(%r1) # validate cpu timer |
| sckc __LC_CLOCK_COMPARATOR # validate comparator |
| lam %a0,%a15,__LC_AREGS_SAVE_AREA-4095(%r1) # validate acrs |
| lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# validate gprs |
| lg %r12,__LC_CURRENT |
| larl %r13,cleanup_critical |
| lmg %r8,%r9,__LC_MCK_OLD_PSW |
| TSTMSK __LC_MCCK_CODE,MCCK_CODE_SYSTEM_DAMAGE |
| jo .Lmcck_panic # yes -> rest of mcck code invalid |
| TSTMSK __LC_MCCK_CODE,MCCK_CODE_CR_VALID |
| jno .Lmcck_panic # control registers invalid -> panic |
| la %r14,4095 |
| lctlg %c0,%c15,__LC_CREGS_SAVE_AREA-4095(%r14) # validate ctl regs |
| ptlb |
| lg %r11,__LC_MCESAD-4095(%r14) # extended machine check save area |
| nill %r11,0xfc00 # MCESA_ORIGIN_MASK |
| TSTMSK __LC_CREGS_SAVE_AREA+16-4095(%r14),CR2_GUARDED_STORAGE |
| jno 0f |
| TSTMSK __LC_MCCK_CODE,MCCK_CODE_GS_VALID |
| jno 0f |
| .insn rxy,0xe3000000004d,0,__MCESA_GS_SAVE_AREA(%r11) # LGSC |
| 0: l %r14,__LC_FP_CREG_SAVE_AREA-4095(%r14) |
| TSTMSK __LC_MCCK_CODE,MCCK_CODE_FC_VALID |
| jo 0f |
| sr %r14,%r14 |
| 0: sfpc %r14 |
| TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_VX |
| jo 0f |
| lghi %r14,__LC_FPREGS_SAVE_AREA |
| ld %f0,0(%r14) |
| ld %f1,8(%r14) |
| ld %f2,16(%r14) |
| ld %f3,24(%r14) |
| ld %f4,32(%r14) |
| ld %f5,40(%r14) |
| ld %f6,48(%r14) |
| ld %f7,56(%r14) |
| ld %f8,64(%r14) |
| ld %f9,72(%r14) |
| ld %f10,80(%r14) |
| ld %f11,88(%r14) |
| ld %f12,96(%r14) |
| ld %f13,104(%r14) |
| ld %f14,112(%r14) |
| ld %f15,120(%r14) |
| j 1f |
| 0: VLM %v0,%v15,0,%r11 |
| VLM %v16,%v31,256,%r11 |
| 1: lghi %r14,__LC_CPU_TIMER_SAVE_AREA |
| mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) |
| TSTMSK __LC_MCCK_CODE,MCCK_CODE_CPU_TIMER_VALID |
| jo 3f |
| la %r14,__LC_SYNC_ENTER_TIMER |
| clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER |
| jl 0f |
| la %r14,__LC_ASYNC_ENTER_TIMER |
| 0: clc 0(8,%r14),__LC_EXIT_TIMER |
| jl 1f |
| la %r14,__LC_EXIT_TIMER |
| 1: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER |
| jl 2f |
| la %r14,__LC_LAST_UPDATE_TIMER |
| 2: spt 0(%r14) |
| mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) |
| 3: TSTMSK __LC_MCCK_CODE,MCCK_CODE_PSW_MWP_VALID |
| jno .Lmcck_panic |
| tmhh %r8,0x0001 # interrupting from user ? |
| jnz 4f |
| TSTMSK __LC_MCCK_CODE,MCCK_CODE_PSW_IA_VALID |
| jno .Lmcck_panic |
| 4: SWITCH_ASYNC __LC_GPREGS_SAVE_AREA+64,__LC_MCCK_ENTER_TIMER |
| .Lmcck_skip: |
| lghi %r14,__LC_GPREGS_SAVE_AREA+64 |
| stmg %r0,%r7,__PT_R0(%r11) |
| # clear user controlled registers to prevent speculative use |
| xgr %r0,%r0 |
| xgr %r1,%r1 |
| xgr %r2,%r2 |
| xgr %r3,%r3 |
| xgr %r4,%r4 |
| xgr %r5,%r5 |
| xgr %r6,%r6 |
| xgr %r7,%r7 |
| xgr %r10,%r10 |
| mvc __PT_R8(64,%r11),0(%r14) |
| stmg %r8,%r9,__PT_PSW(%r11) |
| xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11) |
| xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
| lgr %r2,%r11 # pass pointer to pt_regs |
| brasl %r14,s390_do_machine_check |
| tm __PT_PSW+1(%r11),0x01 # returning to user ? |
| jno .Lmcck_return |
| lg %r1,__LC_KERNEL_STACK # switch to kernel stack |
| mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) |
| xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) |
| la %r11,STACK_FRAME_OVERHEAD(%r1) |
| lgr %r15,%r1 |
| ssm __LC_PGM_NEW_PSW # turn dat on, keep irqs off |
| TSTMSK __LC_CPU_FLAGS,_CIF_MCCK_PENDING |
| jno .Lmcck_return |
| TRACE_IRQS_OFF |
| brasl %r14,s390_handle_mcck |
| TRACE_IRQS_ON |
| .Lmcck_return: |
| lg %r14,__LC_VDSO_PER_CPU |
| lmg %r0,%r10,__PT_R0(%r11) |
| mvc __LC_RETURN_MCCK_PSW(16),__PT_PSW(%r11) # move return PSW |
| tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? |
| jno 0f |
| BPEXIT __TI_flags(%r12),_TIF_ISOLATE_BP |
| stpt __LC_EXIT_TIMER |
| mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER |
| 0: lmg %r11,%r15,__PT_R11(%r11) |
| lpswe __LC_RETURN_MCCK_PSW |
| |
| .Lmcck_panic: |
| lg %r15,__LC_PANIC_STACK |
| la %r11,STACK_FRAME_OVERHEAD(%r15) |
| j .Lmcck_skip |
| |
| # |
| # PSW restart interrupt handler |
| # |
| ENTRY(restart_int_handler) |
| ALTERNATIVE "", ".insn s,0xb2800000,_LPP_OFFSET", 40 |
| stg %r15,__LC_SAVE_AREA_RESTART |
| lg %r15,__LC_RESTART_STACK |
| aghi %r15,-__PT_SIZE # create pt_regs on stack |
| xc 0(__PT_SIZE,%r15),0(%r15) |
| stmg %r0,%r14,__PT_R0(%r15) |
| mvc __PT_R15(8,%r15),__LC_SAVE_AREA_RESTART |
| mvc __PT_PSW(16,%r15),__LC_RST_OLD_PSW # store restart old psw |
| aghi %r15,-STACK_FRAME_OVERHEAD # create stack frame on stack |
| xc 0(STACK_FRAME_OVERHEAD,%r15),0(%r15) |
| lg %r1,__LC_RESTART_FN # load fn, parm & source cpu |
| lg %r2,__LC_RESTART_DATA |
| lg %r3,__LC_RESTART_SOURCE |
| ltgr %r3,%r3 # test source cpu address |
| jm 1f # negative -> skip source stop |
| 0: sigp %r4,%r3,SIGP_SENSE # sigp sense to source cpu |
| brc 10,0b # wait for status stored |
| 1: basr %r14,%r1 # call function |
| stap __SF_EMPTY(%r15) # store cpu address |
| llgh %r3,__SF_EMPTY(%r15) |
| 2: sigp %r4,%r3,SIGP_STOP # sigp stop to current cpu |
| brc 2,2b |
| 3: j 3b |
| |
| .section .kprobes.text, "ax" |
| |
| #ifdef CONFIG_CHECK_STACK |
| /* |
| * The synchronous or the asynchronous stack overflowed. We are dead. |
| * No need to properly save the registers, we are going to panic anyway. |
| * Setup a pt_regs so that show_trace can provide a good call trace. |
| */ |
| stack_overflow: |
| lg %r15,__LC_PANIC_STACK # change to panic stack |
| la %r11,STACK_FRAME_OVERHEAD(%r15) |
| stmg %r0,%r7,__PT_R0(%r11) |
| stmg %r8,%r9,__PT_PSW(%r11) |
| mvc __PT_R8(64,%r11),0(%r14) |
| stg %r10,__PT_ORIG_GPR2(%r11) # store last break to orig_gpr2 |
| xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) |
| lgr %r2,%r11 # pass pointer to pt_regs |
| jg kernel_stack_overflow |
| #endif |
| |
| cleanup_critical: |
| #if IS_ENABLED(CONFIG_KVM) |
| clg %r9,BASED(.Lcleanup_table_sie) # .Lsie_gmap |
| jl 0f |
| clg %r9,BASED(.Lcleanup_table_sie+8)# .Lsie_done |
| jl .Lcleanup_sie |
| #endif |
| clg %r9,BASED(.Lcleanup_table) # system_call |
| jl 0f |
| clg %r9,BASED(.Lcleanup_table+8) # .Lsysc_do_svc |
| jl .Lcleanup_system_call |
| clg %r9,BASED(.Lcleanup_table+16) # .Lsysc_tif |
| jl 0f |
| clg %r9,BASED(.Lcleanup_table+24) # .Lsysc_restore |
| jl .Lcleanup_sysc_tif |
| clg %r9,BASED(.Lcleanup_table+32) # .Lsysc_done |
| jl .Lcleanup_sysc_restore |
| clg %r9,BASED(.Lcleanup_table+40) # .Lio_tif |
| jl 0f |
| clg %r9,BASED(.Lcleanup_table+48) # .Lio_restore |
| jl .Lcleanup_io_tif |
| clg %r9,BASED(.Lcleanup_table+56) # .Lio_done |
| jl .Lcleanup_io_restore |
| clg %r9,BASED(.Lcleanup_table+64) # psw_idle |
| jl 0f |
| clg %r9,BASED(.Lcleanup_table+72) # .Lpsw_idle_end |
| jl .Lcleanup_idle |
| clg %r9,BASED(.Lcleanup_table+80) # save_fpu_regs |
| jl 0f |
| clg %r9,BASED(.Lcleanup_table+88) # .Lsave_fpu_regs_end |
| jl .Lcleanup_save_fpu_regs |
| clg %r9,BASED(.Lcleanup_table+96) # load_fpu_regs |
| jl 0f |
| clg %r9,BASED(.Lcleanup_table+104) # .Lload_fpu_regs_end |
| jl .Lcleanup_load_fpu_regs |
| 0: BR_EX %r14,%r11 |
| |
| .align 8 |
| .Lcleanup_table: |
| .quad system_call |
| .quad .Lsysc_do_svc |
| .quad .Lsysc_tif |
| .quad .Lsysc_restore |
| .quad .Lsysc_done |
| .quad .Lio_tif |
| .quad .Lio_restore |
| .quad .Lio_done |
| .quad psw_idle |
| .quad .Lpsw_idle_end |
| .quad save_fpu_regs |
| .quad .Lsave_fpu_regs_end |
| .quad load_fpu_regs |
| .quad .Lload_fpu_regs_end |
| |
| #if IS_ENABLED(CONFIG_KVM) |
| .Lcleanup_table_sie: |
| .quad .Lsie_gmap |
| .quad .Lsie_done |
| |
| .Lcleanup_sie: |
| cghi %r11,__LC_SAVE_AREA_ASYNC #Is this in normal interrupt? |
| je 1f |
| slg %r9,BASED(.Lsie_crit_mcck_start) |
| clg %r9,BASED(.Lsie_crit_mcck_length) |
| jh 1f |
| oi __LC_CPU_FLAGS+7, _CIF_MCCK_GUEST |
| 1: BPENTER __SF_SIE_FLAGS(%r15),(_TIF_ISOLATE_BP|_TIF_ISOLATE_BP_GUEST) |
| lg %r9,__SF_SIE_CONTROL(%r15) # get control block pointer |
| ni __SIE_PROG0C+3(%r9),0xfe # no longer in SIE |
| lctlg %c1,%c1,__LC_USER_ASCE # load primary asce |
| larl %r9,sie_exit # skip forward to sie_exit |
| BR_EX %r14,%r11 |
| #endif |
| |
| .Lcleanup_system_call: |
| # check if stpt has been executed |
| clg %r9,BASED(.Lcleanup_system_call_insn) |
| jh 0f |
| mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER |
| cghi %r11,__LC_SAVE_AREA_ASYNC |
| je 0f |
| mvc __LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER |
| 0: # check if stmg has been executed |
| clg %r9,BASED(.Lcleanup_system_call_insn+8) |
| jh 0f |
| mvc __LC_SAVE_AREA_SYNC(64),0(%r11) |
| 0: # check if base register setup + TIF bit load has been done |
| clg %r9,BASED(.Lcleanup_system_call_insn+16) |
| jhe 0f |
| # set up saved register r12 task struct pointer |
| stg %r12,32(%r11) |
| # set up saved register r13 __TASK_thread offset |
| mvc 40(8,%r11),BASED(.Lcleanup_system_call_const) |
| 0: # check if the user time update has been done |
| clg %r9,BASED(.Lcleanup_system_call_insn+24) |
| jh 0f |
| lg %r15,__LC_EXIT_TIMER |
| slg %r15,__LC_SYNC_ENTER_TIMER |
| alg %r15,__LC_USER_TIMER |
| stg %r15,__LC_USER_TIMER |
| 0: # check if the system time update has been done |
| clg %r9,BASED(.Lcleanup_system_call_insn+32) |
| jh 0f |
| lg %r15,__LC_LAST_UPDATE_TIMER |
| slg %r15,__LC_EXIT_TIMER |
| alg %r15,__LC_SYSTEM_TIMER |
| stg %r15,__LC_SYSTEM_TIMER |
| 0: # update accounting time stamp |
| mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER |
| BPENTER __TI_flags(%r12),_TIF_ISOLATE_BP |
| # set up saved register r11 |
| lg %r15,__LC_KERNEL_STACK |
| la %r9,STACK_FRAME_OVERHEAD(%r15) |
| stg %r9,24(%r11) # r11 pt_regs pointer |
| # fill pt_regs |
| mvc __PT_R8(64,%r9),__LC_SAVE_AREA_SYNC |
| stmg %r0,%r7,__PT_R0(%r9) |
| mvc __PT_PSW(16,%r9),__LC_SVC_OLD_PSW |
| mvc __PT_INT_CODE(4,%r9),__LC_SVC_ILC |
| xc __PT_FLAGS(8,%r9),__PT_FLAGS(%r9) |
| mvi __PT_FLAGS+7(%r9),_PIF_SYSCALL |
| # setup saved register r15 |
| stg %r15,56(%r11) # r15 stack pointer |
| # set new psw address and exit |
| larl %r9,.Lsysc_do_svc |
| BR_EX %r14,%r11 |
| .Lcleanup_system_call_insn: |
| .quad system_call |
| .quad .Lsysc_stmg |
| .quad .Lsysc_per |
| .quad .Lsysc_vtime+36 |
| .quad .Lsysc_vtime+42 |
| .Lcleanup_system_call_const: |
| .quad __TASK_thread |
| |
| .Lcleanup_sysc_tif: |
| larl %r9,.Lsysc_tif |
| BR_EX %r14,%r11 |
| |
| .Lcleanup_sysc_restore: |
| # check if stpt has been executed |
| clg %r9,BASED(.Lcleanup_sysc_restore_insn) |
| jh 0f |
| mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER |
| cghi %r11,__LC_SAVE_AREA_ASYNC |
| je 0f |
| mvc __LC_EXIT_TIMER(8),__LC_MCCK_ENTER_TIMER |
| 0: clg %r9,BASED(.Lcleanup_sysc_restore_insn+8) |
| je 1f |
| lg %r9,24(%r11) # get saved pointer to pt_regs |
| mvc __LC_RETURN_PSW(16),__PT_PSW(%r9) |
| mvc 0(64,%r11),__PT_R8(%r9) |
| lmg %r0,%r7,__PT_R0(%r9) |
| 1: lmg %r8,%r9,__LC_RETURN_PSW |
| BR_EX %r14,%r11 |
| .Lcleanup_sysc_restore_insn: |
| .quad .Lsysc_exit_timer |
| .quad .Lsysc_done - 4 |
| |
| .Lcleanup_io_tif: |
| larl %r9,.Lio_tif |
| BR_EX %r14,%r11 |
| |
| .Lcleanup_io_restore: |
| # check if stpt has been executed |
| clg %r9,BASED(.Lcleanup_io_restore_insn) |
| jh 0f |
| mvc __LC_EXIT_TIMER(8),__LC_MCCK_ENTER_TIMER |
| 0: clg %r9,BASED(.Lcleanup_io_restore_insn+8) |
| je 1f |
| lg %r9,24(%r11) # get saved r11 pointer to pt_regs |
| mvc __LC_RETURN_PSW(16),__PT_PSW(%r9) |
| mvc 0(64,%r11),__PT_R8(%r9) |
| lmg %r0,%r7,__PT_R0(%r9) |
| 1: lmg %r8,%r9,__LC_RETURN_PSW |
| BR_EX %r14,%r11 |
| .Lcleanup_io_restore_insn: |
| .quad .Lio_exit_timer |
| .quad .Lio_done - 4 |
| |
| .Lcleanup_idle: |
| ni __LC_CPU_FLAGS+7,255-_CIF_ENABLED_WAIT |
| # copy interrupt clock & cpu timer |
| mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_INT_CLOCK |
| mvc __TIMER_IDLE_EXIT(8,%r2),__LC_ASYNC_ENTER_TIMER |
| cghi %r11,__LC_SAVE_AREA_ASYNC |
| je 0f |
| mvc __CLOCK_IDLE_EXIT(8,%r2),__LC_MCCK_CLOCK |
| mvc __TIMER_IDLE_EXIT(8,%r2),__LC_MCCK_ENTER_TIMER |
| 0: # check if stck & stpt have been executed |
| clg %r9,BASED(.Lcleanup_idle_insn) |
| jhe 1f |
| mvc __CLOCK_IDLE_ENTER(8,%r2),__CLOCK_IDLE_EXIT(%r2) |
| mvc __TIMER_IDLE_ENTER(8,%r2),__TIMER_IDLE_EXIT(%r2) |
| 1: # calculate idle cycles |
| #ifdef CONFIG_SMP |
| clg %r9,BASED(.Lcleanup_idle_insn) |
| jl 3f |
| larl %r1,smp_cpu_mtid |
| llgf %r1,0(%r1) |
| ltgr %r1,%r1 |
| jz 3f |
| .insn rsy,0xeb0000000017,%r1,5,__SF_EMPTY+80(%r15) |
| larl %r3,mt_cycles |
| ag %r3,__LC_PERCPU_OFFSET |
| la %r4,__SF_EMPTY+16(%r15) |
| 2: lg %r0,0(%r3) |
| slg %r0,0(%r4) |
| alg %r0,64(%r4) |
| stg %r0,0(%r3) |
| la %r3,8(%r3) |
| la %r4,8(%r4) |
| brct %r1,2b |
| #endif |
| 3: # account system time going idle |
| lg %r9,__LC_STEAL_TIMER |
| alg %r9,__CLOCK_IDLE_ENTER(%r2) |
| slg %r9,__LC_LAST_UPDATE_CLOCK |
| stg %r9,__LC_STEAL_TIMER |
| mvc __LC_LAST_UPDATE_CLOCK(8),__CLOCK_IDLE_EXIT(%r2) |
| lg %r9,__LC_SYSTEM_TIMER |
| alg %r9,__LC_LAST_UPDATE_TIMER |
| slg %r9,__TIMER_IDLE_ENTER(%r2) |
| stg %r9,__LC_SYSTEM_TIMER |
| mvc __LC_LAST_UPDATE_TIMER(8),__TIMER_IDLE_EXIT(%r2) |
| # prepare return psw |
| nihh %r8,0xfcfd # clear irq & wait state bits |
| lg %r9,48(%r11) # return from psw_idle |
| BR_EX %r14,%r11 |
| .Lcleanup_idle_insn: |
| .quad .Lpsw_idle_lpsw |
| |
| .Lcleanup_save_fpu_regs: |
| larl %r9,save_fpu_regs |
| BR_EX %r14,%r11 |
| |
| .Lcleanup_load_fpu_regs: |
| larl %r9,load_fpu_regs |
| BR_EX %r14,%r11 |
| |
| /* |
| * Integer constants |
| */ |
| .align 8 |
| .Lcritical_start: |
| .quad .L__critical_start |
| .Lcritical_length: |
| .quad .L__critical_end - .L__critical_start |
| #if IS_ENABLED(CONFIG_KVM) |
| .Lsie_critical_start: |
| .quad .Lsie_gmap |
| .Lsie_critical_length: |
| .quad .Lsie_done - .Lsie_gmap |
| .Lsie_crit_mcck_start: |
| .quad .Lsie_entry |
| .Lsie_crit_mcck_length: |
| .quad .Lsie_skip - .Lsie_entry |
| #endif |
| .section .rodata, "a" |
| #define SYSCALL(esame,emu) .long esame |
| .globl sys_call_table |
| sys_call_table: |
| #include "asm/syscall_table.h" |
| #undef SYSCALL |
| |
| #ifdef CONFIG_COMPAT |
| |
| #define SYSCALL(esame,emu) .long emu |
| .globl sys_call_table_emu |
| sys_call_table_emu: |
| #include "asm/syscall_table.h" |
| #undef SYSCALL |
| #endif |
