mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-23 10:35:15 +07:00
7041d28115
Clear all user space registers on entry to the kernel and all KVM guest registers on KVM guest exit if the register does not contain either a parameter or a result value. Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
1453 lines
39 KiB
ArmAsm
1453 lines
39 KiB
ArmAsm
/* 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/processor.h>
|
|
#include <asm/cache.h>
|
|
#include <asm/ctl_reg.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>
|
|
|
|
__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)
|
|
|
|
#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
|
|
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
|
|
|
|
.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
|
|
|
|
/*
|
|
* 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
|
|
TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_LPP
|
|
bzr %r14
|
|
.insn s,0xb2800000,__LC_LPP # set program parameter
|
|
br %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
|
|
stg %r2,__SF_EMPTY(%r15) # save control block pointer
|
|
stg %r3,__SF_EMPTY+8(%r15) # save guest register save area
|
|
xc __SF_EMPTY+16(8,%r15),__SF_EMPTY+16(%r15) # reason code = 0
|
|
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_EMPTY(%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
|
|
.Lsie_entry:
|
|
sie 0(%r14)
|
|
.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_EMPTY+8(%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_EMPTY+16(%r15) # return exit reason code
|
|
br %r14
|
|
.Lsie_fault:
|
|
lghi %r14,-EFAULT
|
|
stg %r14,__SF_EMPTY+16(%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
|
|
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
|
|
stmg %r0,%r7,__PT_R0(%r11)
|
|
# clear user controlled register to prevent speculative use
|
|
xgr %r0,%r0
|
|
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:
|
|
# 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 %r14,%r9 # call sys_xxxx
|
|
stg %r2,__PT_R2(%r11) # store return value
|
|
|
|
.Lsysc_return:
|
|
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
|
|
.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 %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 %r14,%r9
|
|
j .Lsysc_tracenogo
|
|
|
|
/*
|
|
* Program check handler routine
|
|
*/
|
|
|
|
ENTRY(pgm_check_handler)
|
|
stpt __LC_SYNC_ENTER_TIMER
|
|
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_EMPTY(%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
|
|
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 %r1,0(%r10,%r1) # load address of handler routine
|
|
lgr %r2,%r11 # pass pointer to pt_regs
|
|
basr %r14,%r1 # 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
|
|
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)
|
|
.Lio_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
|
|
.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
|
|
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
|
|
STCK __CLOCK_IDLE_ENTER(%r2)
|
|
stpt __TIMER_IDLE_ENTER(%r2)
|
|
.Lpsw_idle_lpsw:
|
|
lpswe __SF_EMPTY(%r15)
|
|
br %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
|
|
bor %r14
|
|
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
|
|
br %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
|
|
bnor %r14
|
|
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
|
|
br %r14
|
|
.Lload_fpu_regs_end:
|
|
|
|
.L__critical_end:
|
|
|
|
/*
|
|
* Machine check handler routines
|
|
*/
|
|
ENTRY(mcck_int_handler)
|
|
STCK __LC_MCCK_CLOCK
|
|
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
|
|
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)
|
|
TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_LPP
|
|
jz 0f
|
|
.insn s,0xb2800000,__LC_LPP
|
|
0: 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 %r14
|
|
|
|
.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: lg %r9,__SF_EMPTY(%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 %r14
|
|
#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
|
|
# 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 %r14
|
|
.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 %r14
|
|
|
|
.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 %r14
|
|
.Lcleanup_sysc_restore_insn:
|
|
.quad .Lsysc_exit_timer
|
|
.quad .Lsysc_done - 4
|
|
|
|
.Lcleanup_io_tif:
|
|
larl %r9,.Lio_tif
|
|
br %r14
|
|
|
|
.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 %r14
|
|
.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 %r14
|
|
.Lcleanup_idle_insn:
|
|
.quad .Lpsw_idle_lpsw
|
|
|
|
.Lcleanup_save_fpu_regs:
|
|
larl %r9,save_fpu_regs
|
|
br %r14
|
|
|
|
.Lcleanup_load_fpu_regs:
|
|
larl %r9,load_fpu_regs
|
|
br %r14
|
|
|
|
/*
|
|
* 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
|