1314 строки
34 KiB
ArmAsm
1314 строки
34 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* S390 low-level entry points.
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*
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* Copyright IBM Corp. 1999, 2012
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* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
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* Hartmut Penner (hp@de.ibm.com),
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* Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
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* Heiko Carstens <heiko.carstens@de.ibm.com>
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*/
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#include <linux/init.h>
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#include <linux/linkage.h>
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#include <asm/alternative-asm.h>
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#include <asm/processor.h>
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#include <asm/cache.h>
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#include <asm/ctl_reg.h>
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#include <asm/dwarf.h>
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#include <asm/errno.h>
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#include <asm/ptrace.h>
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#include <asm/thread_info.h>
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#include <asm/asm-offsets.h>
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#include <asm/unistd.h>
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#include <asm/page.h>
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#include <asm/sigp.h>
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#include <asm/irq.h>
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#include <asm/vx-insn.h>
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#include <asm/setup.h>
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#include <asm/nmi.h>
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#include <asm/export.h>
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#include <asm/nospec-insn.h>
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__PT_R0 = __PT_GPRS
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__PT_R1 = __PT_GPRS + 8
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__PT_R2 = __PT_GPRS + 16
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__PT_R3 = __PT_GPRS + 24
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__PT_R4 = __PT_GPRS + 32
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__PT_R5 = __PT_GPRS + 40
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__PT_R6 = __PT_GPRS + 48
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__PT_R7 = __PT_GPRS + 56
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__PT_R8 = __PT_GPRS + 64
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__PT_R9 = __PT_GPRS + 72
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__PT_R10 = __PT_GPRS + 80
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__PT_R11 = __PT_GPRS + 88
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__PT_R12 = __PT_GPRS + 96
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__PT_R13 = __PT_GPRS + 104
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__PT_R14 = __PT_GPRS + 112
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__PT_R15 = __PT_GPRS + 120
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STACK_SHIFT = PAGE_SHIFT + THREAD_SIZE_ORDER
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STACK_SIZE = 1 << STACK_SHIFT
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STACK_INIT = STACK_SIZE - STACK_FRAME_OVERHEAD - __PT_SIZE
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_TIF_WORK = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
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_TIF_UPROBE | _TIF_GUARDED_STORAGE | _TIF_PATCH_PENDING)
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_TIF_TRACE = (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \
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_TIF_SYSCALL_TRACEPOINT)
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_CIF_WORK = (_CIF_ASCE_PRIMARY | _CIF_ASCE_SECONDARY | _CIF_FPU)
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_PIF_WORK = (_PIF_PER_TRAP | _PIF_SYSCALL_RESTART)
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_LPP_OFFSET = __LC_LPP
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.macro TRACE_IRQS_ON
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#ifdef CONFIG_TRACE_IRQFLAGS
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basr %r2,%r0
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brasl %r14,trace_hardirqs_on_caller
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#endif
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.endm
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.macro TRACE_IRQS_OFF
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#ifdef CONFIG_TRACE_IRQFLAGS
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basr %r2,%r0
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brasl %r14,trace_hardirqs_off_caller
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#endif
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.endm
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.macro LOCKDEP_SYS_EXIT
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#ifdef CONFIG_LOCKDEP
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tm __PT_PSW+1(%r11),0x01 # returning to user ?
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jz .+10
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brasl %r14,lockdep_sys_exit
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#endif
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.endm
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.macro CHECK_STACK savearea
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#ifdef CONFIG_CHECK_STACK
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tml %r15,STACK_SIZE - CONFIG_STACK_GUARD
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lghi %r14,\savearea
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jz stack_overflow
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#endif
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.endm
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.macro CHECK_VMAP_STACK savearea,oklabel
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#ifdef CONFIG_VMAP_STACK
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lgr %r14,%r15
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nill %r14,0x10000 - STACK_SIZE
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oill %r14,STACK_INIT
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clg %r14,__LC_KERNEL_STACK
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je \oklabel
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clg %r14,__LC_ASYNC_STACK
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je \oklabel
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clg %r14,__LC_NODAT_STACK
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je \oklabel
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clg %r14,__LC_RESTART_STACK
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je \oklabel
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lghi %r14,\savearea
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j stack_overflow
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#else
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j \oklabel
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#endif
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.endm
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.macro SWITCH_ASYNC savearea,timer
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tmhh %r8,0x0001 # interrupting from user ?
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jnz 2f
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#if IS_ENABLED(CONFIG_KVM)
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lgr %r14,%r9
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larl %r13,.Lsie_gmap
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slgr %r14,%r13
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lghi %r13,.Lsie_done - .Lsie_gmap
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clgr %r14,%r13
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jhe 0f
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lghi %r11,\savearea # inside critical section, do cleanup
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brasl %r14,.Lcleanup_sie
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#endif
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0: larl %r13,.Lpsw_idle_exit
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cgr %r13,%r9
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jne 1f
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mvc __CLOCK_IDLE_EXIT(8,%r2), __LC_INT_CLOCK
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mvc __TIMER_IDLE_EXIT(8,%r2), __LC_ASYNC_ENTER_TIMER
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# account system time going idle
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ni __LC_CPU_FLAGS+7,255-_CIF_ENABLED_WAIT
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lg %r13,__LC_STEAL_TIMER
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alg %r13,__CLOCK_IDLE_ENTER(%r2)
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slg %r13,__LC_LAST_UPDATE_CLOCK
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stg %r13,__LC_STEAL_TIMER
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mvc __LC_LAST_UPDATE_CLOCK(8),__CLOCK_IDLE_EXIT(%r2)
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lg %r13,__LC_SYSTEM_TIMER
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alg %r13,__LC_LAST_UPDATE_TIMER
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slg %r13,__TIMER_IDLE_ENTER(%r2)
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stg %r13,__LC_SYSTEM_TIMER
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mvc __LC_LAST_UPDATE_TIMER(8),__TIMER_IDLE_EXIT(%r2)
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nihh %r8,0xfcfd # clear wait state and irq bits
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1: lg %r14,__LC_ASYNC_STACK # are we already on the target stack?
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slgr %r14,%r15
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srag %r14,%r14,STACK_SHIFT
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jnz 3f
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CHECK_STACK \savearea
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aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
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j 4f
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2: UPDATE_VTIME %r14,%r15,\timer
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BPENTER __TI_flags(%r12),_TIF_ISOLATE_BP
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3: lg %r15,__LC_ASYNC_STACK # load async stack
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4: la %r11,STACK_FRAME_OVERHEAD(%r15)
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.endm
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.macro UPDATE_VTIME w1,w2,enter_timer
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lg \w1,__LC_EXIT_TIMER
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lg \w2,__LC_LAST_UPDATE_TIMER
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slg \w1,\enter_timer
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slg \w2,__LC_EXIT_TIMER
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alg \w1,__LC_USER_TIMER
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alg \w2,__LC_SYSTEM_TIMER
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stg \w1,__LC_USER_TIMER
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stg \w2,__LC_SYSTEM_TIMER
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mvc __LC_LAST_UPDATE_TIMER(8),\enter_timer
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.endm
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.macro RESTORE_SM_CLEAR_PER
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stg %r8,__LC_RETURN_PSW
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ni __LC_RETURN_PSW,0xbf
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ssm __LC_RETURN_PSW
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.endm
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.macro ENABLE_INTS
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stosm __SF_EMPTY(%r15),3
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.endm
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.macro ENABLE_INTS_TRACE
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TRACE_IRQS_ON
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ENABLE_INTS
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.endm
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.macro DISABLE_INTS
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stnsm __SF_EMPTY(%r15),0xfc
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.endm
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.macro DISABLE_INTS_TRACE
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DISABLE_INTS
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TRACE_IRQS_OFF
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.endm
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.macro STCK savearea
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#ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES
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.insn s,0xb27c0000,\savearea # store clock fast
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#else
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.insn s,0xb2050000,\savearea # store clock
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#endif
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.endm
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/*
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* The TSTMSK macro generates a test-under-mask instruction by
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* calculating the memory offset for the specified mask value.
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* Mask value can be any constant. The macro shifts the mask
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* value to calculate the memory offset for the test-under-mask
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* instruction.
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*/
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.macro TSTMSK addr, mask, size=8, bytepos=0
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.if (\bytepos < \size) && (\mask >> 8)
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.if (\mask & 0xff)
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.error "Mask exceeds byte boundary"
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.endif
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TSTMSK \addr, "(\mask >> 8)", \size, "(\bytepos + 1)"
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.exitm
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.endif
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.ifeq \mask
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.error "Mask must not be zero"
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.endif
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off = \size - \bytepos - 1
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tm off+\addr, \mask
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.endm
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.macro BPOFF
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ALTERNATIVE "", ".long 0xb2e8c000", 82
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.endm
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.macro BPON
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ALTERNATIVE "", ".long 0xb2e8d000", 82
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.endm
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.macro BPENTER tif_ptr,tif_mask
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ALTERNATIVE "TSTMSK \tif_ptr,\tif_mask; jz .+8; .long 0xb2e8d000", \
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"", 82
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.endm
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.macro BPEXIT tif_ptr,tif_mask
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TSTMSK \tif_ptr,\tif_mask
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ALTERNATIVE "jz .+8; .long 0xb2e8c000", \
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"jnz .+8; .long 0xb2e8d000", 82
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.endm
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GEN_BR_THUNK %r9
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GEN_BR_THUNK %r14
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GEN_BR_THUNK %r14,%r11
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.section .kprobes.text, "ax"
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.Ldummy:
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/*
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* This nop exists only in order to avoid that __switch_to starts at
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* the beginning of the kprobes text section. In that case we would
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* have several symbols at the same address. E.g. objdump would take
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* an arbitrary symbol name when disassembling this code.
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* With the added nop in between the __switch_to symbol is unique
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* again.
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*/
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nop 0
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ENTRY(__bpon)
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.globl __bpon
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BPON
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BR_EX %r14
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ENDPROC(__bpon)
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/*
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* Scheduler resume function, called by switch_to
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* gpr2 = (task_struct *) prev
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* gpr3 = (task_struct *) next
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* Returns:
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* gpr2 = prev
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*/
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ENTRY(__switch_to)
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stmg %r6,%r15,__SF_GPRS(%r15) # store gprs of prev task
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lghi %r4,__TASK_stack
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lghi %r1,__TASK_thread
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llill %r5,STACK_INIT
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stg %r15,__THREAD_ksp(%r1,%r2) # store kernel stack of prev
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lg %r15,0(%r4,%r3) # start of kernel stack of next
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agr %r15,%r5 # end of kernel stack of next
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stg %r3,__LC_CURRENT # store task struct of next
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stg %r15,__LC_KERNEL_STACK # store end of kernel stack
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lg %r15,__THREAD_ksp(%r1,%r3) # load kernel stack of next
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aghi %r3,__TASK_pid
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mvc __LC_CURRENT_PID(4,%r0),0(%r3) # store pid of next
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lmg %r6,%r15,__SF_GPRS(%r15) # load gprs of next task
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ALTERNATIVE "", ".insn s,0xb2800000,_LPP_OFFSET", 40
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BR_EX %r14
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ENDPROC(__switch_to)
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#if IS_ENABLED(CONFIG_KVM)
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/*
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* sie64a calling convention:
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* %r2 pointer to sie control block
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* %r3 guest register save area
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*/
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ENTRY(sie64a)
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stmg %r6,%r14,__SF_GPRS(%r15) # save kernel registers
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lg %r12,__LC_CURRENT
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stg %r2,__SF_SIE_CONTROL(%r15) # save control block pointer
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stg %r3,__SF_SIE_SAVEAREA(%r15) # save guest register save area
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xc __SF_SIE_REASON(8,%r15),__SF_SIE_REASON(%r15) # reason code = 0
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mvc __SF_SIE_FLAGS(8,%r15),__TI_flags(%r12) # copy thread flags
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TSTMSK __LC_CPU_FLAGS,_CIF_FPU # load guest fp/vx registers ?
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jno .Lsie_load_guest_gprs
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brasl %r14,load_fpu_regs # load guest fp/vx regs
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.Lsie_load_guest_gprs:
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lmg %r0,%r13,0(%r3) # load guest gprs 0-13
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lg %r14,__LC_GMAP # get gmap pointer
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ltgr %r14,%r14
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jz .Lsie_gmap
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lctlg %c1,%c1,__GMAP_ASCE(%r14) # load primary asce
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.Lsie_gmap:
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lg %r14,__SF_SIE_CONTROL(%r15) # get control block pointer
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oi __SIE_PROG0C+3(%r14),1 # we are going into SIE now
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tm __SIE_PROG20+3(%r14),3 # last exit...
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jnz .Lsie_skip
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TSTMSK __LC_CPU_FLAGS,_CIF_FPU
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jo .Lsie_skip # exit if fp/vx regs changed
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BPEXIT __SF_SIE_FLAGS(%r15),(_TIF_ISOLATE_BP|_TIF_ISOLATE_BP_GUEST)
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.Lsie_entry:
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sie 0(%r14)
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BPOFF
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BPENTER __SF_SIE_FLAGS(%r15),(_TIF_ISOLATE_BP|_TIF_ISOLATE_BP_GUEST)
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.Lsie_skip:
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ni __SIE_PROG0C+3(%r14),0xfe # no longer in SIE
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lctlg %c1,%c1,__LC_USER_ASCE # load primary asce
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.Lsie_done:
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# some program checks are suppressing. C code (e.g. do_protection_exception)
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# will rewind the PSW by the ILC, which is often 4 bytes in case of SIE. There
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# are some corner cases (e.g. runtime instrumentation) where ILC is unpredictable.
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# Other instructions between sie64a and .Lsie_done should not cause program
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# interrupts. So lets use 3 nops as a landing pad for all possible rewinds.
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# See also .Lcleanup_sie
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.Lrewind_pad6:
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nopr 7
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.Lrewind_pad4:
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nopr 7
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.Lrewind_pad2:
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nopr 7
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.globl sie_exit
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sie_exit:
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lg %r14,__SF_SIE_SAVEAREA(%r15) # load guest register save area
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stmg %r0,%r13,0(%r14) # save guest gprs 0-13
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xgr %r0,%r0 # clear guest registers to
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xgr %r1,%r1 # prevent speculative use
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xgr %r2,%r2
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xgr %r3,%r3
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xgr %r4,%r4
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xgr %r5,%r5
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lmg %r6,%r14,__SF_GPRS(%r15) # restore kernel registers
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lg %r2,__SF_SIE_REASON(%r15) # return exit reason code
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BR_EX %r14
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.Lsie_fault:
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lghi %r14,-EFAULT
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stg %r14,__SF_SIE_REASON(%r15) # set exit reason code
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j sie_exit
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EX_TABLE(.Lrewind_pad6,.Lsie_fault)
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EX_TABLE(.Lrewind_pad4,.Lsie_fault)
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EX_TABLE(.Lrewind_pad2,.Lsie_fault)
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EX_TABLE(sie_exit,.Lsie_fault)
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ENDPROC(sie64a)
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EXPORT_SYMBOL(sie64a)
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EXPORT_SYMBOL(sie_exit)
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#endif
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/*
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* SVC interrupt handler routine. System calls are synchronous events and
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* are executed with interrupts enabled.
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*/
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ENTRY(system_call)
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stpt __LC_SYNC_ENTER_TIMER
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stmg %r8,%r15,__LC_SAVE_AREA_SYNC
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BPOFF
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lg %r12,__LC_CURRENT
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lghi %r13,__TASK_thread
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lghi %r14,_PIF_SYSCALL
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.Lsysc_per:
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lg %r15,__LC_KERNEL_STACK
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la %r11,STACK_FRAME_OVERHEAD(%r15) # pointer to pt_regs
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UPDATE_VTIME %r8,%r9,__LC_SYNC_ENTER_TIMER
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BPENTER __TI_flags(%r12),_TIF_ISOLATE_BP
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stmg %r0,%r7,__PT_R0(%r11)
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mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC
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mvc __PT_PSW(16,%r11),__LC_SVC_OLD_PSW
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mvc __PT_INT_CODE(4,%r11),__LC_SVC_ILC
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stg %r14,__PT_FLAGS(%r11)
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ENABLE_INTS
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.Lsysc_do_svc:
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# clear user controlled register to prevent speculative use
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xgr %r0,%r0
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# load address of system call table
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lg %r10,__THREAD_sysc_table(%r13,%r12)
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llgh %r8,__PT_INT_CODE+2(%r11)
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slag %r8,%r8,3 # shift and test for svc 0
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jnz .Lsysc_nr_ok
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# svc 0: system call number in %r1
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llgfr %r1,%r1 # clear high word in r1
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cghi %r1,NR_syscalls
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jnl .Lsysc_nr_ok
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sth %r1,__PT_INT_CODE+2(%r11)
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slag %r8,%r1,3
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.Lsysc_nr_ok:
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xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
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stg %r2,__PT_ORIG_GPR2(%r11)
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stg %r7,STACK_FRAME_OVERHEAD(%r15)
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lg %r9,0(%r8,%r10) # get system call add.
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TSTMSK __TI_flags(%r12),_TIF_TRACE
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jnz .Lsysc_tracesys
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BASR_EX %r14,%r9 # call sys_xxxx
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stg %r2,__PT_R2(%r11) # store return value
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.Lsysc_return:
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#ifdef CONFIG_DEBUG_RSEQ
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lgr %r2,%r11
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brasl %r14,rseq_syscall
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#endif
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LOCKDEP_SYS_EXIT
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.Lsysc_tif:
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TSTMSK __PT_FLAGS(%r11),_PIF_WORK
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jnz .Lsysc_work
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TSTMSK __TI_flags(%r12),_TIF_WORK
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jnz .Lsysc_work # check for work
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TSTMSK __LC_CPU_FLAGS,(_CIF_WORK-_CIF_FPU)
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jnz .Lsysc_work
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BPEXIT __TI_flags(%r12),_TIF_ISOLATE_BP
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.Lsysc_restore:
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DISABLE_INTS
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TSTMSK __LC_CPU_FLAGS, _CIF_FPU
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jz .Lsysc_skip_fpu
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brasl %r14,load_fpu_regs
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.Lsysc_skip_fpu:
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lg %r14,__LC_VDSO_PER_CPU
|
|
mvc __LC_RETURN_PSW(16),__PT_PSW(%r11)
|
|
stpt __LC_EXIT_TIMER
|
|
mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER
|
|
lmg %r0,%r15,__PT_R0(%r11)
|
|
b __LC_RETURN_LPSWE
|
|
|
|
#
|
|
# One of the work bits is on. Find out which one.
|
|
#
|
|
.Lsysc_work:
|
|
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_ASCE_PRIMARY|_CIF_ASCE_SECONDARY)
|
|
jnz .Lsysc_asce
|
|
j .Lsysc_return
|
|
|
|
#
|
|
# _TIF_NEED_RESCHED is set, call schedule
|
|
#
|
|
.Lsysc_reschedule:
|
|
larl %r14,.Lsysc_return
|
|
jg schedule
|
|
|
|
#
|
|
# _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
|
|
|
|
|
|
#
|
|
# _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,%r2,3
|
|
lg %r9,0(%r8,%r10)
|
|
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
|
|
ENDPROC(system_call)
|
|
|
|
#
|
|
# 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
|
|
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
|
|
la %r2,0(%r10)
|
|
BASR_EX %r14,%r9
|
|
j .Lsysc_tracenogo
|
|
ENDPROC(ret_from_fork)
|
|
|
|
ENTRY(kernel_thread_starter)
|
|
la %r2,0(%r10)
|
|
BASR_EX %r14,%r9
|
|
j .Lsysc_tracenogo
|
|
ENDPROC(kernel_thread_starter)
|
|
|
|
/*
|
|
* 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
|
|
srag %r11,%r10,12
|
|
jnz 0f
|
|
/* if __LC_LAST_BREAK is < 4096, it contains one of
|
|
* the lpswe addresses in lowcore. Set it to 1 (initial state)
|
|
* to prevent leaking that address to userspace.
|
|
*/
|
|
lghi %r10,1
|
|
0: lg %r12,__LC_CURRENT
|
|
lghi %r11,0
|
|
lmg %r8,%r9,__LC_PGM_OLD_PSW
|
|
tmhh %r8,0x0001 # test problem state bit
|
|
jnz 3f # -> fault in user space
|
|
#if IS_ENABLED(CONFIG_KVM)
|
|
# cleanup critical section for program checks in sie64a
|
|
lgr %r14,%r9
|
|
larl %r13,.Lsie_gmap
|
|
slgr %r14,%r13
|
|
lghi %r13,.Lsie_done - .Lsie_gmap
|
|
clgr %r14,%r13
|
|
jhe 1f
|
|
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
|
|
1: tmhh %r8,0x4000 # PER bit set in old PSW ?
|
|
jnz 2f # -> enabled, can't be a double fault
|
|
tm __LC_PGM_ILC+3,0x80 # check for per exception
|
|
jnz .Lpgm_svcper # -> single stepped svc
|
|
2: CHECK_STACK __LC_SAVE_AREA_SYNC
|
|
aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
|
|
# CHECK_VMAP_STACK branches to stack_overflow or 5f
|
|
CHECK_VMAP_STACK __LC_SAVE_AREA_SYNC,5f
|
|
3: 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 4f
|
|
mvc __THREAD_trap_tdb(256,%r14),0(%r13)
|
|
4: stg %r10,__THREAD_last_break(%r14)
|
|
5: 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 6f
|
|
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
|
|
6: RESTORE_SM_CLEAR_PER
|
|
xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
|
|
larl %r1,pgm_check_table
|
|
llgh %r10,__PT_INT_CODE+2(%r11)
|
|
nill %r10,0x007f
|
|
sll %r10,3
|
|
je .Lpgm_return
|
|
lg %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:
|
|
RESTORE_SM_CLEAR_PER
|
|
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
|
|
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
|
|
ENDPROC(pgm_check_handler)
|
|
|
|
/*
|
|
* 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
|
|
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
|
|
#if IS_ENABLED(CONFIG_TRACE_IRQFLAGS)
|
|
tmhh %r8,0x300
|
|
jz 1f
|
|
TRACE_IRQS_OFF
|
|
1:
|
|
#endif
|
|
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
|
|
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:
|
|
#if IS_ENABLED(CONFIG_TRACE_IRQFLAGS)
|
|
tm __PT_PSW(%r11),3
|
|
jno 0f
|
|
TRACE_IRQS_ON
|
|
0:
|
|
#endif
|
|
lg %r14,__LC_VDSO_PER_CPU
|
|
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
|
|
stpt __LC_EXIT_TIMER
|
|
mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER
|
|
.Lio_exit_kernel:
|
|
lmg %r0,%r15,__PT_R0(%r11)
|
|
b __LC_RETURN_LPSWE
|
|
.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_PREEMPTION
|
|
# 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
|
|
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.
|
|
#
|
|
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
|
|
|
|
#
|
|
# _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:
|
|
ENABLE_INTS_TRACE
|
|
lgr %r2,%r11 # pass pointer to pt_regs
|
|
brasl %r14,gs_load_bc_cb
|
|
DISABLE_INTS_TRACE
|
|
j .Lio_return
|
|
|
|
#
|
|
# _TIF_NEED_RESCHED is set, call schedule
|
|
#
|
|
.Lio_reschedule:
|
|
ENABLE_INTS_TRACE
|
|
brasl %r14,schedule # call scheduler
|
|
DISABLE_INTS_TRACE
|
|
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:
|
|
ENABLE_INTS_TRACE
|
|
lgr %r2,%r11 # pass pointer to pt_regs
|
|
brasl %r14,do_signal
|
|
DISABLE_INTS_TRACE
|
|
j .Lio_return
|
|
|
|
#
|
|
# _TIF_NOTIFY_RESUME or is set, call do_notify_resume
|
|
#
|
|
.Lio_notify_resume:
|
|
ENABLE_INTS_TRACE
|
|
lgr %r2,%r11 # pass pointer to pt_regs
|
|
brasl %r14,do_notify_resume
|
|
DISABLE_INTS_TRACE
|
|
j .Lio_return
|
|
ENDPROC(io_int_handler)
|
|
|
|
/*
|
|
* 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
|
|
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
|
|
#if IS_ENABLED(CONFIG_TRACE_IRQFLAGS)
|
|
tmhh %r8,0x300
|
|
jz 1f
|
|
TRACE_IRQS_OFF
|
|
1:
|
|
#endif
|
|
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
|
|
ENDPROC(ext_int_handler)
|
|
|
|
/*
|
|
* Load idle PSW.
|
|
*/
|
|
ENTRY(psw_idle)
|
|
stg %r3,__SF_EMPTY(%r15)
|
|
larl %r1,.Lpsw_idle_exit
|
|
stg %r1,__SF_EMPTY+8(%r15)
|
|
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:
|
|
oi __LC_CPU_FLAGS+7,_CIF_ENABLED_WAIT
|
|
BPON
|
|
STCK __CLOCK_IDLE_ENTER(%r2)
|
|
stpt __TIMER_IDLE_ENTER(%r2)
|
|
lpswe __SF_EMPTY(%r15)
|
|
.Lpsw_idle_exit:
|
|
BR_EX %r14
|
|
ENDPROC(psw_idle)
|
|
|
|
/*
|
|
* 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)
|
|
stnsm __SF_EMPTY(%r15),0xfc
|
|
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:
|
|
ssm __SF_EMPTY(%r15)
|
|
BR_EX %r14
|
|
.Lsave_fpu_regs_end:
|
|
ENDPROC(save_fpu_regs)
|
|
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:
|
|
ENDPROC(load_fpu_regs)
|
|
|
|
/*
|
|
* 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
|
|
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: ssm __LC_PGM_NEW_PSW # turn dat on, keep irqs off
|
|
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
|
|
cghi %r2,0
|
|
je .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
|
|
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)
|
|
b __LC_RETURN_MCCK_LPSWE
|
|
|
|
.Lmcck_panic:
|
|
lg %r15,__LC_NODAT_STACK
|
|
la %r11,STACK_FRAME_OVERHEAD(%r15)
|
|
j .Lmcck_skip
|
|
ENDPROC(mcck_int_handler)
|
|
|
|
#
|
|
# 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
|
|
xc STACK_FRAME_OVERHEAD(__PT_SIZE,%r15),STACK_FRAME_OVERHEAD(%r15)
|
|
stmg %r0,%r14,STACK_FRAME_OVERHEAD+__PT_R0(%r15)
|
|
mvc STACK_FRAME_OVERHEAD+__PT_R15(8,%r15),__LC_SAVE_AREA_RESTART
|
|
mvc STACK_FRAME_OVERHEAD+__PT_PSW(16,%r15),__LC_RST_OLD_PSW
|
|
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
|
|
ENDPROC(restart_int_handler)
|
|
|
|
.section .kprobes.text, "ax"
|
|
|
|
#if defined(CONFIG_CHECK_STACK) || defined(CONFIG_VMAP_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.
|
|
*/
|
|
ENTRY(stack_overflow)
|
|
lg %r15,__LC_NODAT_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
|
|
ENDPROC(stack_overflow)
|
|
#endif
|
|
|
|
#if IS_ENABLED(CONFIG_KVM)
|
|
.Lcleanup_sie:
|
|
cghi %r11,__LC_SAVE_AREA_ASYNC #Is this in normal interrupt?
|
|
je 1f
|
|
larl %r13,.Lsie_entry
|
|
slgr %r9,%r13
|
|
larl %r13,.Lsie_skip
|
|
clgr %r9,%r13
|
|
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
|
|
.section .rodata, "a"
|
|
#define SYSCALL(esame,emu) .quad __s390x_ ## esame
|
|
.globl sys_call_table
|
|
sys_call_table:
|
|
#include "asm/syscall_table.h"
|
|
#undef SYSCALL
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
|
|
#define SYSCALL(esame,emu) .quad __s390_ ## emu
|
|
.globl sys_call_table_emu
|
|
sys_call_table_emu:
|
|
#include "asm/syscall_table.h"
|
|
#undef SYSCALL
|
|
#endif
|