forked from Minki/linux
bcc6525fb2
On s390 there are two ways of specifying the system call number for the svc instruction. The standard way is to use the immediate field in the instruction (or to use EXecute for values unknown during assemble time). This can encode 256 system calls. The kernel ABI also allows to put the system call number in r1 and then execute svc 0 to enable system call numbers > 255. It turns out that single stepping svc 0 is broken, since the PER program check handler uses r1. We have to use a different register. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
1079 lines
31 KiB
ArmAsm
1079 lines
31 KiB
ArmAsm
/*
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* arch/s390/kernel/entry64.S
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* S390 low-level entry points.
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*
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* Copyright (C) IBM Corp. 1999,2006
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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/sys.h>
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#include <linux/linkage.h>
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#include <linux/init.h>
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#include <asm/cache.h>
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#include <asm/lowcore.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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/*
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* Stack layout for the system_call stack entry.
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* The first few entries are identical to the user_regs_struct.
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*/
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SP_PTREGS = STACK_FRAME_OVERHEAD
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SP_ARGS = STACK_FRAME_OVERHEAD + __PT_ARGS
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SP_PSW = STACK_FRAME_OVERHEAD + __PT_PSW
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SP_R0 = STACK_FRAME_OVERHEAD + __PT_GPRS
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SP_R1 = STACK_FRAME_OVERHEAD + __PT_GPRS + 8
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SP_R2 = STACK_FRAME_OVERHEAD + __PT_GPRS + 16
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SP_R3 = STACK_FRAME_OVERHEAD + __PT_GPRS + 24
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SP_R4 = STACK_FRAME_OVERHEAD + __PT_GPRS + 32
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SP_R5 = STACK_FRAME_OVERHEAD + __PT_GPRS + 40
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SP_R6 = STACK_FRAME_OVERHEAD + __PT_GPRS + 48
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SP_R7 = STACK_FRAME_OVERHEAD + __PT_GPRS + 56
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SP_R8 = STACK_FRAME_OVERHEAD + __PT_GPRS + 64
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SP_R9 = STACK_FRAME_OVERHEAD + __PT_GPRS + 72
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SP_R10 = STACK_FRAME_OVERHEAD + __PT_GPRS + 80
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SP_R11 = STACK_FRAME_OVERHEAD + __PT_GPRS + 88
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SP_R12 = STACK_FRAME_OVERHEAD + __PT_GPRS + 96
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SP_R13 = STACK_FRAME_OVERHEAD + __PT_GPRS + 104
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SP_R14 = STACK_FRAME_OVERHEAD + __PT_GPRS + 112
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SP_R15 = STACK_FRAME_OVERHEAD + __PT_GPRS + 120
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SP_ORIG_R2 = STACK_FRAME_OVERHEAD + __PT_ORIG_GPR2
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SP_ILC = STACK_FRAME_OVERHEAD + __PT_ILC
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SP_SVCNR = STACK_FRAME_OVERHEAD + __PT_SVCNR
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SP_SIZE = STACK_FRAME_OVERHEAD + __PT_SIZE
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STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER
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STACK_SIZE = 1 << STACK_SHIFT
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_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
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_TIF_MCCK_PENDING | _TIF_RESTART_SVC | _TIF_SINGLE_STEP )
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_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
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_TIF_MCCK_PENDING)
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_TIF_SYSCALL = (_TIF_SYSCALL_TRACE>>8 | _TIF_SYSCALL_AUDIT>>8 | \
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_TIF_SECCOMP>>8 | _TIF_SYSCALL_TRACEPOINT>>8)
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#define BASED(name) name-system_call(%r13)
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#ifdef CONFIG_TRACE_IRQFLAGS
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.macro TRACE_IRQS_ON
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basr %r2,%r0
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brasl %r14,trace_hardirqs_on_caller
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.endm
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.macro TRACE_IRQS_OFF
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basr %r2,%r0
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brasl %r14,trace_hardirqs_off_caller
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.endm
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.macro TRACE_IRQS_CHECK
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basr %r2,%r0
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tm SP_PSW(%r15),0x03 # irqs enabled?
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jz 0f
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brasl %r14,trace_hardirqs_on_caller
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j 1f
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0: brasl %r14,trace_hardirqs_off_caller
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1:
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.endm
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#else
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#define TRACE_IRQS_ON
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#define TRACE_IRQS_OFF
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#define TRACE_IRQS_CHECK
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#endif
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#ifdef CONFIG_LOCKDEP
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.macro LOCKDEP_SYS_EXIT
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tm SP_PSW+1(%r15),0x01 # returning to user ?
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jz 0f
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brasl %r14,lockdep_sys_exit
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0:
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.endm
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#else
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#define LOCKDEP_SYS_EXIT
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#endif
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.macro UPDATE_VTIME lc_from,lc_to,lc_sum
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lg %r10,\lc_from
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slg %r10,\lc_to
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alg %r10,\lc_sum
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stg %r10,\lc_sum
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.endm
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/*
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* Register usage in interrupt handlers:
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* R9 - pointer to current task structure
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* R13 - pointer to literal pool
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* R14 - return register for function calls
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* R15 - kernel stack pointer
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*/
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.macro SAVE_ALL_BASE savearea
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stmg %r12,%r15,\savearea
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larl %r13,system_call
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.endm
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.macro SAVE_ALL_SVC psworg,savearea
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la %r12,\psworg
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lg %r15,__LC_KERNEL_STACK # problem state -> load ksp
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.endm
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.macro SAVE_ALL_SYNC psworg,savearea
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la %r12,\psworg
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tm \psworg+1,0x01 # test problem state bit
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jz 2f # skip stack setup save
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lg %r15,__LC_KERNEL_STACK # problem state -> load ksp
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#ifdef CONFIG_CHECK_STACK
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j 3f
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2: tml %r15,STACK_SIZE - CONFIG_STACK_GUARD
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jz stack_overflow
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3:
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#endif
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2:
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.endm
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.macro SAVE_ALL_ASYNC psworg,savearea
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la %r12,\psworg
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tm \psworg+1,0x01 # test problem state bit
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jnz 1f # from user -> load kernel stack
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clc \psworg+8(8),BASED(.Lcritical_end)
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jhe 0f
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clc \psworg+8(8),BASED(.Lcritical_start)
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jl 0f
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brasl %r14,cleanup_critical
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tm 1(%r12),0x01 # retest problem state after cleanup
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jnz 1f
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0: lg %r14,__LC_ASYNC_STACK # are we already on the async. stack ?
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slgr %r14,%r15
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srag %r14,%r14,STACK_SHIFT
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jz 2f
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1: lg %r15,__LC_ASYNC_STACK # load async stack
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#ifdef CONFIG_CHECK_STACK
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j 3f
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2: tml %r15,STACK_SIZE - CONFIG_STACK_GUARD
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jz stack_overflow
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3:
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#endif
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2:
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.endm
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.macro CREATE_STACK_FRAME psworg,savearea
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aghi %r15,-SP_SIZE # make room for registers & psw
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mvc SP_PSW(16,%r15),0(%r12) # move user PSW to stack
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stg %r2,SP_ORIG_R2(%r15) # store original content of gpr 2
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icm %r12,3,__LC_SVC_ILC
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stmg %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack
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st %r12,SP_SVCNR(%r15)
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mvc SP_R12(32,%r15),\savearea # move %r12-%r15 to stack
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la %r12,0
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stg %r12,__SF_BACKCHAIN(%r15)
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.endm
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.macro RESTORE_ALL psworg,sync
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mvc \psworg(16),SP_PSW(%r15) # move user PSW to lowcore
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.if !\sync
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ni \psworg+1,0xfd # clear wait state bit
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.endif
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lg %r14,__LC_VDSO_PER_CPU
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lmg %r0,%r13,SP_R0(%r15) # load gprs 0-13 of user
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stpt __LC_EXIT_TIMER
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mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER
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lmg %r14,%r15,SP_R14(%r15) # load grps 14-15 of user
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lpswe \psworg # back to caller
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.endm
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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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.globl __switch_to
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__switch_to:
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tm __THREAD_per+4(%r3),0xe8 # is the new process using per ?
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jz __switch_to_noper # if not we're fine
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stctg %c9,%c11,__SF_EMPTY(%r15)# We are using per stuff
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clc __THREAD_per(24,%r3),__SF_EMPTY(%r15)
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je __switch_to_noper # we got away without bashing TLB's
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lctlg %c9,%c11,__THREAD_per(%r3) # Nope we didn't
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__switch_to_noper:
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lg %r4,__THREAD_info(%r2) # get thread_info of prev
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tm __TI_flags+7(%r4),_TIF_MCCK_PENDING # machine check pending?
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jz __switch_to_no_mcck
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ni __TI_flags+7(%r4),255-_TIF_MCCK_PENDING # clear flag in prev
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lg %r4,__THREAD_info(%r3) # get thread_info of next
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oi __TI_flags+7(%r4),_TIF_MCCK_PENDING # set it in next
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__switch_to_no_mcck:
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stmg %r6,%r15,__SF_GPRS(%r15)# store __switch_to registers of prev task
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stg %r15,__THREAD_ksp(%r2) # store kernel stack to prev->tss.ksp
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lg %r15,__THREAD_ksp(%r3) # load kernel stack from next->tss.ksp
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lmg %r6,%r15,__SF_GPRS(%r15)# load __switch_to registers of next task
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stg %r3,__LC_CURRENT # __LC_CURRENT = current task struct
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lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4
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lg %r3,__THREAD_info(%r3) # load thread_info from task struct
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stg %r3,__LC_THREAD_INFO
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aghi %r3,STACK_SIZE
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stg %r3,__LC_KERNEL_STACK # __LC_KERNEL_STACK = new kernel stack
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br %r14
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__critical_start:
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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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.globl system_call
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system_call:
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stpt __LC_SYNC_ENTER_TIMER
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sysc_saveall:
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SAVE_ALL_BASE __LC_SAVE_AREA
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SAVE_ALL_SVC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
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CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
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llgh %r7,__LC_SVC_INT_CODE # get svc number from lowcore
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sysc_vtime:
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UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
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sysc_stime:
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UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
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sysc_update:
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mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
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sysc_do_svc:
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lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
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ltgr %r7,%r7 # test for svc 0
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jnz sysc_nr_ok
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# svc 0: system call number in %r1
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cl %r1,BASED(.Lnr_syscalls)
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jnl sysc_nr_ok
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lgfr %r7,%r1 # clear high word in r1
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sysc_nr_ok:
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mvc SP_ARGS(8,%r15),SP_R7(%r15)
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sysc_do_restart:
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sth %r7,SP_SVCNR(%r15)
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sllg %r7,%r7,2 # svc number * 4
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larl %r10,sys_call_table
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#ifdef CONFIG_COMPAT
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tm __TI_flags+5(%r9),(_TIF_31BIT>>16) # running in 31 bit mode ?
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jno sysc_noemu
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larl %r10,sys_call_table_emu # use 31 bit emulation system calls
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sysc_noemu:
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#endif
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tm __TI_flags+6(%r9),_TIF_SYSCALL
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lgf %r8,0(%r7,%r10) # load address of system call routine
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jnz sysc_tracesys
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basr %r14,%r8 # call sys_xxxx
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stg %r2,SP_R2(%r15) # store return value (change R2 on stack)
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sysc_return:
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tm __TI_flags+7(%r9),_TIF_WORK_SVC
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jnz sysc_work # there is work to do (signals etc.)
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sysc_restore:
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#ifdef CONFIG_TRACE_IRQFLAGS
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larl %r1,sysc_restore_trace_psw
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lpswe 0(%r1)
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sysc_restore_trace:
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TRACE_IRQS_CHECK
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LOCKDEP_SYS_EXIT
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#endif
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sysc_leave:
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RESTORE_ALL __LC_RETURN_PSW,1
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sysc_done:
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#ifdef CONFIG_TRACE_IRQFLAGS
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.section .data,"aw",@progbits
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.align 8
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.globl sysc_restore_trace_psw
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sysc_restore_trace_psw:
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.quad 0, sysc_restore_trace
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.previous
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#endif
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#
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# recheck if there is more work to do
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#
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sysc_work_loop:
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tm __TI_flags+7(%r9),_TIF_WORK_SVC
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jz sysc_restore # there is no work to do
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#
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# One of the work bits is on. Find out which one.
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#
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sysc_work:
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tm SP_PSW+1(%r15),0x01 # returning to user ?
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jno sysc_restore
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tm __TI_flags+7(%r9),_TIF_MCCK_PENDING
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jo sysc_mcck_pending
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tm __TI_flags+7(%r9),_TIF_NEED_RESCHED
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jo sysc_reschedule
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tm __TI_flags+7(%r9),_TIF_SIGPENDING
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jnz sysc_sigpending
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tm __TI_flags+7(%r9),_TIF_NOTIFY_RESUME
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jnz sysc_notify_resume
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tm __TI_flags+7(%r9),_TIF_RESTART_SVC
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jo sysc_restart
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tm __TI_flags+7(%r9),_TIF_SINGLE_STEP
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jo sysc_singlestep
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j sysc_restore
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sysc_work_done:
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#
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# _TIF_NEED_RESCHED is set, call schedule
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#
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sysc_reschedule:
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larl %r14,sysc_work_loop
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jg schedule # return point is sysc_return
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#
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# _TIF_MCCK_PENDING is set, call handler
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#
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sysc_mcck_pending:
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larl %r14,sysc_work_loop
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jg s390_handle_mcck # TIF bit will be cleared by handler
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#
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# _TIF_SIGPENDING is set, call do_signal
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#
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sysc_sigpending:
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ni __TI_flags+7(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
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la %r2,SP_PTREGS(%r15) # load pt_regs
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brasl %r14,do_signal # call do_signal
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tm __TI_flags+7(%r9),_TIF_RESTART_SVC
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jo sysc_restart
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tm __TI_flags+7(%r9),_TIF_SINGLE_STEP
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jo sysc_singlestep
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j sysc_work_loop
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#
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# _TIF_NOTIFY_RESUME is set, call do_notify_resume
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#
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sysc_notify_resume:
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la %r2,SP_PTREGS(%r15) # load pt_regs
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larl %r14,sysc_work_loop
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jg do_notify_resume # call do_notify_resume
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#
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# _TIF_RESTART_SVC is set, set up registers and restart svc
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#
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sysc_restart:
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ni __TI_flags+7(%r9),255-_TIF_RESTART_SVC # clear TIF_RESTART_SVC
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lg %r7,SP_R2(%r15) # load new svc number
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mvc SP_R2(8,%r15),SP_ORIG_R2(%r15) # restore first argument
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lmg %r2,%r6,SP_R2(%r15) # load svc arguments
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j sysc_do_restart # restart svc
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#
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# _TIF_SINGLE_STEP is set, call do_single_step
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#
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sysc_singlestep:
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ni __TI_flags+7(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
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xc SP_SVCNR(2,%r15),SP_SVCNR(%r15) # clear svc number
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la %r2,SP_PTREGS(%r15) # address of register-save area
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larl %r14,sysc_return # load adr. of system return
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jg do_single_step # branch to do_sigtrap
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#
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# call tracehook_report_syscall_entry/tracehook_report_syscall_exit before
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# and after the system call
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#
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sysc_tracesys:
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la %r2,SP_PTREGS(%r15) # load pt_regs
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la %r3,0
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srl %r7,2
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stg %r7,SP_R2(%r15)
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brasl %r14,do_syscall_trace_enter
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lghi %r0,NR_syscalls
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clgr %r0,%r2
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jnh sysc_tracenogo
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sllg %r7,%r2,2 # svc number *4
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lgf %r8,0(%r7,%r10)
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sysc_tracego:
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lmg %r3,%r6,SP_R3(%r15)
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lg %r2,SP_ORIG_R2(%r15)
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basr %r14,%r8 # call sys_xxx
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stg %r2,SP_R2(%r15) # store return value
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sysc_tracenogo:
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tm __TI_flags+6(%r9),_TIF_SYSCALL
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jz sysc_return
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la %r2,SP_PTREGS(%r15) # load pt_regs
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larl %r14,sysc_return # return point is sysc_return
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jg do_syscall_trace_exit
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#
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# a new process exits the kernel with ret_from_fork
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#
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.globl ret_from_fork
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ret_from_fork:
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lg %r13,__LC_SVC_NEW_PSW+8
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lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
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tm SP_PSW+1(%r15),0x01 # forking a kernel thread ?
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jo 0f
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stg %r15,SP_R15(%r15) # store stack pointer for new kthread
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0: brasl %r14,schedule_tail
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TRACE_IRQS_ON
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stosm 24(%r15),0x03 # reenable interrupts
|
|
j sysc_tracenogo
|
|
|
|
#
|
|
# kernel_execve function needs to deal with pt_regs that is not
|
|
# at the usual place
|
|
#
|
|
.globl kernel_execve
|
|
kernel_execve:
|
|
stmg %r12,%r15,96(%r15)
|
|
lgr %r14,%r15
|
|
aghi %r15,-SP_SIZE
|
|
stg %r14,__SF_BACKCHAIN(%r15)
|
|
la %r12,SP_PTREGS(%r15)
|
|
xc 0(__PT_SIZE,%r12),0(%r12)
|
|
lgr %r5,%r12
|
|
brasl %r14,do_execve
|
|
ltgfr %r2,%r2
|
|
je 0f
|
|
aghi %r15,SP_SIZE
|
|
lmg %r12,%r15,96(%r15)
|
|
br %r14
|
|
# execve succeeded.
|
|
0: stnsm __SF_EMPTY(%r15),0xfc # disable interrupts
|
|
lg %r15,__LC_KERNEL_STACK # load ksp
|
|
aghi %r15,-SP_SIZE # make room for registers & psw
|
|
lg %r13,__LC_SVC_NEW_PSW+8
|
|
lg %r9,__LC_THREAD_INFO
|
|
mvc SP_PTREGS(__PT_SIZE,%r15),0(%r12) # copy pt_regs
|
|
xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
|
|
stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
|
|
brasl %r14,execve_tail
|
|
j sysc_return
|
|
|
|
/*
|
|
* Program check handler routine
|
|
*/
|
|
|
|
.globl pgm_check_handler
|
|
pgm_check_handler:
|
|
/*
|
|
* First we need to check for a special case:
|
|
* Single stepping an instruction that disables the PER event mask will
|
|
* cause a PER event AFTER the mask has been set. Example: SVC or LPSW.
|
|
* For a single stepped SVC the program check handler gets control after
|
|
* the SVC new PSW has been loaded. But we want to execute the SVC first and
|
|
* then handle the PER event. Therefore we update the SVC old PSW to point
|
|
* to the pgm_check_handler and branch to the SVC handler after we checked
|
|
* if we have to load the kernel stack register.
|
|
* For every other possible cause for PER event without the PER mask set
|
|
* we just ignore the PER event (FIXME: is there anything we have to do
|
|
* for LPSW?).
|
|
*/
|
|
stpt __LC_SYNC_ENTER_TIMER
|
|
SAVE_ALL_BASE __LC_SAVE_AREA
|
|
tm __LC_PGM_INT_CODE+1,0x80 # check whether we got a per exception
|
|
jnz pgm_per # got per exception -> special case
|
|
SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA
|
|
CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA
|
|
tm SP_PSW+1(%r15),0x01 # interrupting from user ?
|
|
jz pgm_no_vtime
|
|
UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
|
|
UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
|
|
mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
|
|
pgm_no_vtime:
|
|
lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
|
|
mvc SP_ARGS(8,%r15),__LC_LAST_BREAK
|
|
TRACE_IRQS_OFF
|
|
lgf %r3,__LC_PGM_ILC # load program interruption code
|
|
lghi %r8,0x7f
|
|
ngr %r8,%r3
|
|
pgm_do_call:
|
|
sll %r8,3
|
|
larl %r1,pgm_check_table
|
|
lg %r1,0(%r8,%r1) # load address of handler routine
|
|
la %r2,SP_PTREGS(%r15) # address of register-save area
|
|
larl %r14,sysc_return
|
|
br %r1 # branch to interrupt-handler
|
|
|
|
#
|
|
# handle per exception
|
|
#
|
|
pgm_per:
|
|
tm __LC_PGM_OLD_PSW,0x40 # test if per event recording is on
|
|
jnz pgm_per_std # ok, normal per event from user space
|
|
# ok its one of the special cases, now we need to find out which one
|
|
clc __LC_PGM_OLD_PSW(16),__LC_SVC_NEW_PSW
|
|
je pgm_svcper
|
|
# no interesting special case, ignore PER event
|
|
lmg %r12,%r15,__LC_SAVE_AREA
|
|
lpswe __LC_PGM_OLD_PSW
|
|
|
|
#
|
|
# Normal per exception
|
|
#
|
|
pgm_per_std:
|
|
SAVE_ALL_SYNC __LC_PGM_OLD_PSW,__LC_SAVE_AREA
|
|
CREATE_STACK_FRAME __LC_PGM_OLD_PSW,__LC_SAVE_AREA
|
|
tm SP_PSW+1(%r15),0x01 # interrupting from user ?
|
|
jz pgm_no_vtime2
|
|
UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
|
|
UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
|
|
mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
|
|
pgm_no_vtime2:
|
|
lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
|
|
TRACE_IRQS_OFF
|
|
lg %r1,__TI_task(%r9)
|
|
tm SP_PSW+1(%r15),0x01 # kernel per event ?
|
|
jz kernel_per
|
|
mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID
|
|
mvc __THREAD_per+__PER_address(8,%r1),__LC_PER_ADDRESS
|
|
mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID
|
|
oi __TI_flags+7(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP
|
|
lgf %r3,__LC_PGM_ILC # load program interruption code
|
|
lghi %r8,0x7f
|
|
ngr %r8,%r3 # clear per-event-bit and ilc
|
|
je sysc_return
|
|
j pgm_do_call
|
|
|
|
#
|
|
# it was a single stepped SVC that is causing all the trouble
|
|
#
|
|
pgm_svcper:
|
|
SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
|
|
CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
|
|
UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
|
|
UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
|
|
mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
|
|
llgh %r7,__LC_SVC_INT_CODE # get svc number from lowcore
|
|
lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
|
|
lg %r8,__TI_task(%r9)
|
|
mvc __THREAD_per+__PER_atmid(2,%r8),__LC_PER_ATMID
|
|
mvc __THREAD_per+__PER_address(8,%r8),__LC_PER_ADDRESS
|
|
mvc __THREAD_per+__PER_access_id(1,%r8),__LC_PER_ACCESS_ID
|
|
oi __TI_flags+7(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP
|
|
TRACE_IRQS_ON
|
|
stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
|
|
j sysc_do_svc
|
|
|
|
#
|
|
# per was called from kernel, must be kprobes
|
|
#
|
|
kernel_per:
|
|
xc SP_SVCNR(2,%r15),SP_SVCNR(%r15) # clear svc number
|
|
la %r2,SP_PTREGS(%r15) # address of register-save area
|
|
larl %r14,sysc_restore # load adr. of system ret, no work
|
|
jg do_single_step # branch to do_single_step
|
|
|
|
/*
|
|
* IO interrupt handler routine
|
|
*/
|
|
.globl io_int_handler
|
|
io_int_handler:
|
|
stck __LC_INT_CLOCK
|
|
stpt __LC_ASYNC_ENTER_TIMER
|
|
SAVE_ALL_BASE __LC_SAVE_AREA+32
|
|
SAVE_ALL_ASYNC __LC_IO_OLD_PSW,__LC_SAVE_AREA+32
|
|
CREATE_STACK_FRAME __LC_IO_OLD_PSW,__LC_SAVE_AREA+32
|
|
tm SP_PSW+1(%r15),0x01 # interrupting from user ?
|
|
jz io_no_vtime
|
|
UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
|
|
UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
|
|
mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
|
|
io_no_vtime:
|
|
lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
|
|
TRACE_IRQS_OFF
|
|
la %r2,SP_PTREGS(%r15) # address of register-save area
|
|
brasl %r14,do_IRQ # call standard irq handler
|
|
io_return:
|
|
tm __TI_flags+7(%r9),_TIF_WORK_INT
|
|
jnz io_work # there is work to do (signals etc.)
|
|
io_restore:
|
|
#ifdef CONFIG_TRACE_IRQFLAGS
|
|
larl %r1,io_restore_trace_psw
|
|
lpswe 0(%r1)
|
|
io_restore_trace:
|
|
TRACE_IRQS_CHECK
|
|
LOCKDEP_SYS_EXIT
|
|
#endif
|
|
io_leave:
|
|
RESTORE_ALL __LC_RETURN_PSW,0
|
|
io_done:
|
|
|
|
#ifdef CONFIG_TRACE_IRQFLAGS
|
|
.section .data,"aw",@progbits
|
|
.align 8
|
|
.globl io_restore_trace_psw
|
|
io_restore_trace_psw:
|
|
.quad 0, io_restore_trace
|
|
.previous
|
|
#endif
|
|
|
|
#
|
|
# There is work todo, we need to check if we return to userspace, then
|
|
# check, if we are in SIE, if yes leave it
|
|
#
|
|
io_work:
|
|
tm SP_PSW+1(%r15),0x01 # returning to user ?
|
|
#ifndef CONFIG_PREEMPT
|
|
#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE)
|
|
jnz io_work_user # yes -> no need to check for SIE
|
|
la %r1, BASED(sie_opcode) # we return to kernel here
|
|
lg %r2, SP_PSW+8(%r15)
|
|
clc 0(2,%r1), 0(%r2) # is current instruction = SIE?
|
|
jne io_restore # no-> return to kernel
|
|
lg %r1, SP_PSW+8(%r15) # yes-> add 4 bytes to leave SIE
|
|
aghi %r1, 4
|
|
stg %r1, SP_PSW+8(%r15)
|
|
j io_restore # return to kernel
|
|
#else
|
|
jno io_restore # no-> skip resched & signal
|
|
#endif
|
|
#else
|
|
jnz io_work_user # yes -> do resched & signal
|
|
#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE)
|
|
la %r1, BASED(sie_opcode)
|
|
lg %r2, SP_PSW+8(%r15)
|
|
clc 0(2,%r1), 0(%r2) # is current instruction = SIE?
|
|
jne 0f # no -> leave PSW alone
|
|
lg %r1, SP_PSW+8(%r15) # yes-> add 4 bytes to leave SIE
|
|
aghi %r1, 4
|
|
stg %r1, SP_PSW+8(%r15)
|
|
0:
|
|
#endif
|
|
# check for preemptive scheduling
|
|
icm %r0,15,__TI_precount(%r9)
|
|
jnz io_restore # preemption is disabled
|
|
# switch to kernel stack
|
|
lg %r1,SP_R15(%r15)
|
|
aghi %r1,-SP_SIZE
|
|
mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
|
|
xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) # clear back chain
|
|
lgr %r15,%r1
|
|
io_resume_loop:
|
|
tm __TI_flags+7(%r9),_TIF_NEED_RESCHED
|
|
jno io_restore
|
|
larl %r14,io_resume_loop
|
|
jg preempt_schedule_irq
|
|
#endif
|
|
|
|
io_work_user:
|
|
lg %r1,__LC_KERNEL_STACK
|
|
aghi %r1,-SP_SIZE
|
|
mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
|
|
xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) # clear back chain
|
|
lgr %r15,%r1
|
|
#
|
|
# One of the work bits is on. Find out which one.
|
|
# Checked are: _TIF_SIGPENDING, _TIF_RESTORE_SIGPENDING, _TIF_NEED_RESCHED
|
|
# and _TIF_MCCK_PENDING
|
|
#
|
|
io_work_loop:
|
|
tm __TI_flags+7(%r9),_TIF_MCCK_PENDING
|
|
jo io_mcck_pending
|
|
tm __TI_flags+7(%r9),_TIF_NEED_RESCHED
|
|
jo io_reschedule
|
|
tm __TI_flags+7(%r9),_TIF_SIGPENDING
|
|
jnz io_sigpending
|
|
tm __TI_flags+7(%r9),_TIF_NOTIFY_RESUME
|
|
jnz io_notify_resume
|
|
j io_restore
|
|
io_work_done:
|
|
|
|
#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE)
|
|
sie_opcode:
|
|
.long 0xb2140000
|
|
#endif
|
|
|
|
#
|
|
# _TIF_MCCK_PENDING is set, call handler
|
|
#
|
|
io_mcck_pending:
|
|
brasl %r14,s390_handle_mcck # TIF bit will be cleared by handler
|
|
j io_work_loop
|
|
|
|
#
|
|
# _TIF_NEED_RESCHED is set, call schedule
|
|
#
|
|
io_reschedule:
|
|
TRACE_IRQS_ON
|
|
stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
|
|
brasl %r14,schedule # call scheduler
|
|
stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts
|
|
TRACE_IRQS_OFF
|
|
tm __TI_flags+7(%r9),_TIF_WORK_INT
|
|
jz io_restore # there is no work to do
|
|
j io_work_loop
|
|
|
|
#
|
|
# _TIF_SIGPENDING or is set, call do_signal
|
|
#
|
|
io_sigpending:
|
|
TRACE_IRQS_ON
|
|
stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
|
|
la %r2,SP_PTREGS(%r15) # load pt_regs
|
|
brasl %r14,do_signal # call do_signal
|
|
stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts
|
|
TRACE_IRQS_OFF
|
|
j io_work_loop
|
|
|
|
#
|
|
# _TIF_NOTIFY_RESUME or is set, call do_notify_resume
|
|
#
|
|
io_notify_resume:
|
|
TRACE_IRQS_ON
|
|
stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
|
|
la %r2,SP_PTREGS(%r15) # load pt_regs
|
|
brasl %r14,do_notify_resume # call do_notify_resume
|
|
stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts
|
|
TRACE_IRQS_OFF
|
|
j io_work_loop
|
|
|
|
/*
|
|
* External interrupt handler routine
|
|
*/
|
|
.globl ext_int_handler
|
|
ext_int_handler:
|
|
stck __LC_INT_CLOCK
|
|
stpt __LC_ASYNC_ENTER_TIMER
|
|
SAVE_ALL_BASE __LC_SAVE_AREA+32
|
|
SAVE_ALL_ASYNC __LC_EXT_OLD_PSW,__LC_SAVE_AREA+32
|
|
CREATE_STACK_FRAME __LC_EXT_OLD_PSW,__LC_SAVE_AREA+32
|
|
tm SP_PSW+1(%r15),0x01 # interrupting from user ?
|
|
jz ext_no_vtime
|
|
UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
|
|
UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
|
|
mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
|
|
ext_no_vtime:
|
|
lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
|
|
TRACE_IRQS_OFF
|
|
la %r2,SP_PTREGS(%r15) # address of register-save area
|
|
llgh %r3,__LC_EXT_INT_CODE # get interruption code
|
|
brasl %r14,do_extint
|
|
j io_return
|
|
|
|
__critical_end:
|
|
|
|
/*
|
|
* Machine check handler routines
|
|
*/
|
|
.globl mcck_int_handler
|
|
mcck_int_handler:
|
|
stck __LC_INT_CLOCK
|
|
la %r1,4095 # revalidate r1
|
|
spt __LC_CPU_TIMER_SAVE_AREA-4095(%r1) # revalidate cpu timer
|
|
lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs
|
|
SAVE_ALL_BASE __LC_SAVE_AREA+64
|
|
la %r12,__LC_MCK_OLD_PSW
|
|
tm __LC_MCCK_CODE,0x80 # system damage?
|
|
jo mcck_int_main # yes -> rest of mcck code invalid
|
|
la %r14,4095
|
|
mvc __LC_SAVE_AREA+104(8),__LC_ASYNC_ENTER_TIMER
|
|
mvc __LC_ASYNC_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA-4095(%r14)
|
|
tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid?
|
|
jo 1f
|
|
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 0f
|
|
la %r14,__LC_EXIT_TIMER
|
|
0: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER
|
|
jl 0f
|
|
la %r14,__LC_LAST_UPDATE_TIMER
|
|
0: spt 0(%r14)
|
|
mvc __LC_ASYNC_ENTER_TIMER(8),0(%r14)
|
|
1: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid?
|
|
jno mcck_int_main # no -> skip cleanup critical
|
|
tm __LC_MCK_OLD_PSW+1,0x01 # test problem state bit
|
|
jnz mcck_int_main # from user -> load kernel stack
|
|
clc __LC_MCK_OLD_PSW+8(8),BASED(.Lcritical_end)
|
|
jhe mcck_int_main
|
|
clc __LC_MCK_OLD_PSW+8(8),BASED(.Lcritical_start)
|
|
jl mcck_int_main
|
|
brasl %r14,cleanup_critical
|
|
mcck_int_main:
|
|
lg %r14,__LC_PANIC_STACK # are we already on the panic stack?
|
|
slgr %r14,%r15
|
|
srag %r14,%r14,PAGE_SHIFT
|
|
jz 0f
|
|
lg %r15,__LC_PANIC_STACK # load panic stack
|
|
0: CREATE_STACK_FRAME __LC_MCK_OLD_PSW,__LC_SAVE_AREA+64
|
|
tm __LC_MCCK_CODE+2,0x08 # mwp of old psw valid?
|
|
jno mcck_no_vtime # no -> no timer update
|
|
tm SP_PSW+1(%r15),0x01 # interrupting from user ?
|
|
jz mcck_no_vtime
|
|
UPDATE_VTIME __LC_EXIT_TIMER,__LC_ASYNC_ENTER_TIMER,__LC_USER_TIMER
|
|
UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
|
|
mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
|
|
mcck_no_vtime:
|
|
lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
|
|
la %r2,SP_PTREGS(%r15) # load pt_regs
|
|
brasl %r14,s390_do_machine_check
|
|
tm SP_PSW+1(%r15),0x01 # returning to user ?
|
|
jno mcck_return
|
|
lg %r1,__LC_KERNEL_STACK # switch to kernel stack
|
|
aghi %r1,-SP_SIZE
|
|
mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
|
|
xc __SF_BACKCHAIN(8,%r1),__SF_BACKCHAIN(%r1) # clear back chain
|
|
lgr %r15,%r1
|
|
stosm __SF_EMPTY(%r15),0x04 # turn dat on
|
|
tm __TI_flags+7(%r9),_TIF_MCCK_PENDING
|
|
jno mcck_return
|
|
TRACE_IRQS_OFF
|
|
brasl %r14,s390_handle_mcck
|
|
TRACE_IRQS_ON
|
|
mcck_return:
|
|
mvc __LC_RETURN_MCCK_PSW(16),SP_PSW(%r15) # move return PSW
|
|
ni __LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit
|
|
lmg %r0,%r15,SP_R0(%r15) # load gprs 0-15
|
|
mvc __LC_ASYNC_ENTER_TIMER(8),__LC_SAVE_AREA+104
|
|
tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ?
|
|
jno 0f
|
|
stpt __LC_EXIT_TIMER
|
|
0: lpswe __LC_RETURN_MCCK_PSW # back to caller
|
|
|
|
/*
|
|
* Restart interruption handler, kick starter for additional CPUs
|
|
*/
|
|
#ifdef CONFIG_SMP
|
|
__CPUINIT
|
|
.globl restart_int_handler
|
|
restart_int_handler:
|
|
basr %r1,0
|
|
restart_base:
|
|
spt restart_vtime-restart_base(%r1)
|
|
stck __LC_LAST_UPDATE_CLOCK
|
|
mvc __LC_LAST_UPDATE_TIMER(8),restart_vtime-restart_base(%r1)
|
|
mvc __LC_EXIT_TIMER(8),restart_vtime-restart_base(%r1)
|
|
lg %r15,__LC_SAVE_AREA+120 # load ksp
|
|
lghi %r10,__LC_CREGS_SAVE_AREA
|
|
lctlg %c0,%c15,0(%r10) # get new ctl regs
|
|
lghi %r10,__LC_AREGS_SAVE_AREA
|
|
lam %a0,%a15,0(%r10)
|
|
lmg %r6,%r15,__SF_GPRS(%r15) # load registers from clone
|
|
lg %r1,__LC_THREAD_INFO
|
|
mvc __LC_USER_TIMER(8),__TI_user_timer(%r1)
|
|
mvc __LC_SYSTEM_TIMER(8),__TI_system_timer(%r1)
|
|
xc __LC_STEAL_TIMER(8),__LC_STEAL_TIMER
|
|
stosm __SF_EMPTY(%r15),0x04 # now we can turn dat on
|
|
jg start_secondary
|
|
.align 8
|
|
restart_vtime:
|
|
.long 0x7fffffff,0xffffffff
|
|
.previous
|
|
#else
|
|
/*
|
|
* If we do not run with SMP enabled, let the new CPU crash ...
|
|
*/
|
|
.globl restart_int_handler
|
|
restart_int_handler:
|
|
basr %r1,0
|
|
restart_base:
|
|
lpswe restart_crash-restart_base(%r1)
|
|
.align 8
|
|
restart_crash:
|
|
.long 0x000a0000,0x00000000,0x00000000,0x00000000
|
|
restart_go:
|
|
#endif
|
|
|
|
#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
|
|
aghi %r15,-SP_SIZE
|
|
mvc SP_PSW(16,%r15),0(%r12) # move user PSW to stack
|
|
stmg %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack
|
|
la %r1,__LC_SAVE_AREA
|
|
chi %r12,__LC_SVC_OLD_PSW
|
|
je 0f
|
|
chi %r12,__LC_PGM_OLD_PSW
|
|
je 0f
|
|
la %r1,__LC_SAVE_AREA+32
|
|
0: mvc SP_R12(32,%r15),0(%r1) # move %r12-%r15 to stack
|
|
mvc SP_ARGS(8,%r15),__LC_LAST_BREAK
|
|
xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) # clear back chain
|
|
la %r2,SP_PTREGS(%r15) # load pt_regs
|
|
jg kernel_stack_overflow
|
|
#endif
|
|
|
|
cleanup_table_system_call:
|
|
.quad system_call, sysc_do_svc
|
|
cleanup_table_sysc_return:
|
|
.quad sysc_return, sysc_leave
|
|
cleanup_table_sysc_leave:
|
|
.quad sysc_leave, sysc_done
|
|
cleanup_table_sysc_work_loop:
|
|
.quad sysc_work_loop, sysc_work_done
|
|
cleanup_table_io_return:
|
|
.quad io_return, io_leave
|
|
cleanup_table_io_leave:
|
|
.quad io_leave, io_done
|
|
cleanup_table_io_work_loop:
|
|
.quad io_work_loop, io_work_done
|
|
|
|
cleanup_critical:
|
|
clc 8(8,%r12),BASED(cleanup_table_system_call)
|
|
jl 0f
|
|
clc 8(8,%r12),BASED(cleanup_table_system_call+8)
|
|
jl cleanup_system_call
|
|
0:
|
|
clc 8(8,%r12),BASED(cleanup_table_sysc_return)
|
|
jl 0f
|
|
clc 8(8,%r12),BASED(cleanup_table_sysc_return+8)
|
|
jl cleanup_sysc_return
|
|
0:
|
|
clc 8(8,%r12),BASED(cleanup_table_sysc_leave)
|
|
jl 0f
|
|
clc 8(8,%r12),BASED(cleanup_table_sysc_leave+8)
|
|
jl cleanup_sysc_leave
|
|
0:
|
|
clc 8(8,%r12),BASED(cleanup_table_sysc_work_loop)
|
|
jl 0f
|
|
clc 8(8,%r12),BASED(cleanup_table_sysc_work_loop+8)
|
|
jl cleanup_sysc_return
|
|
0:
|
|
clc 8(8,%r12),BASED(cleanup_table_io_return)
|
|
jl 0f
|
|
clc 8(8,%r12),BASED(cleanup_table_io_return+8)
|
|
jl cleanup_io_return
|
|
0:
|
|
clc 8(8,%r12),BASED(cleanup_table_io_leave)
|
|
jl 0f
|
|
clc 8(8,%r12),BASED(cleanup_table_io_leave+8)
|
|
jl cleanup_io_leave
|
|
0:
|
|
clc 8(8,%r12),BASED(cleanup_table_io_work_loop)
|
|
jl 0f
|
|
clc 8(8,%r12),BASED(cleanup_table_io_work_loop+8)
|
|
jl cleanup_io_return
|
|
0:
|
|
br %r14
|
|
|
|
cleanup_system_call:
|
|
mvc __LC_RETURN_PSW(16),0(%r12)
|
|
cghi %r12,__LC_MCK_OLD_PSW
|
|
je 0f
|
|
la %r12,__LC_SAVE_AREA+32
|
|
j 1f
|
|
0: la %r12,__LC_SAVE_AREA+64
|
|
1:
|
|
clc __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+8)
|
|
jh 0f
|
|
mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER
|
|
0: clc __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+16)
|
|
jhe cleanup_vtime
|
|
clc __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn)
|
|
jh 0f
|
|
mvc __LC_SAVE_AREA(32),0(%r12)
|
|
0: stg %r13,8(%r12)
|
|
stg %r12,__LC_SAVE_AREA+96 # argh
|
|
SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
|
|
CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
|
|
lg %r12,__LC_SAVE_AREA+96 # argh
|
|
stg %r15,24(%r12)
|
|
llgh %r7,__LC_SVC_INT_CODE
|
|
cleanup_vtime:
|
|
clc __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+24)
|
|
jhe cleanup_stime
|
|
UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
|
|
cleanup_stime:
|
|
clc __LC_RETURN_PSW+8(8),BASED(cleanup_system_call_insn+32)
|
|
jh cleanup_update
|
|
UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
|
|
cleanup_update:
|
|
mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
|
|
mvc __LC_RETURN_PSW+8(8),BASED(cleanup_table_system_call+8)
|
|
la %r12,__LC_RETURN_PSW
|
|
br %r14
|
|
cleanup_system_call_insn:
|
|
.quad sysc_saveall
|
|
.quad system_call
|
|
.quad sysc_vtime
|
|
.quad sysc_stime
|
|
.quad sysc_update
|
|
|
|
cleanup_sysc_return:
|
|
mvc __LC_RETURN_PSW(8),0(%r12)
|
|
mvc __LC_RETURN_PSW+8(8),BASED(cleanup_table_sysc_return)
|
|
la %r12,__LC_RETURN_PSW
|
|
br %r14
|
|
|
|
cleanup_sysc_leave:
|
|
clc 8(8,%r12),BASED(cleanup_sysc_leave_insn)
|
|
je 3f
|
|
clc 8(8,%r12),BASED(cleanup_sysc_leave_insn+8)
|
|
jhe 0f
|
|
mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
|
|
0: mvc __LC_RETURN_PSW(16),SP_PSW(%r15)
|
|
cghi %r12,__LC_MCK_OLD_PSW
|
|
jne 1f
|
|
mvc __LC_SAVE_AREA+64(32),SP_R12(%r15)
|
|
j 2f
|
|
1: mvc __LC_SAVE_AREA+32(32),SP_R12(%r15)
|
|
2: lmg %r0,%r11,SP_R0(%r15)
|
|
lg %r15,SP_R15(%r15)
|
|
3: la %r12,__LC_RETURN_PSW
|
|
br %r14
|
|
cleanup_sysc_leave_insn:
|
|
.quad sysc_done - 4
|
|
.quad sysc_done - 16
|
|
|
|
cleanup_io_return:
|
|
mvc __LC_RETURN_PSW(8),0(%r12)
|
|
mvc __LC_RETURN_PSW+8(8),BASED(cleanup_table_io_work_loop)
|
|
la %r12,__LC_RETURN_PSW
|
|
br %r14
|
|
|
|
cleanup_io_leave:
|
|
clc 8(8,%r12),BASED(cleanup_io_leave_insn)
|
|
je 3f
|
|
clc 8(8,%r12),BASED(cleanup_io_leave_insn+8)
|
|
jhe 0f
|
|
mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
|
|
0: mvc __LC_RETURN_PSW(16),SP_PSW(%r15)
|
|
cghi %r12,__LC_MCK_OLD_PSW
|
|
jne 1f
|
|
mvc __LC_SAVE_AREA+64(32),SP_R12(%r15)
|
|
j 2f
|
|
1: mvc __LC_SAVE_AREA+32(32),SP_R12(%r15)
|
|
2: lmg %r0,%r11,SP_R0(%r15)
|
|
lg %r15,SP_R15(%r15)
|
|
3: la %r12,__LC_RETURN_PSW
|
|
br %r14
|
|
cleanup_io_leave_insn:
|
|
.quad io_done - 4
|
|
.quad io_done - 16
|
|
|
|
/*
|
|
* Integer constants
|
|
*/
|
|
.align 4
|
|
.Lconst:
|
|
.Lnr_syscalls: .long NR_syscalls
|
|
.L0x0130: .short 0x130
|
|
.L0x0140: .short 0x140
|
|
.L0x0150: .short 0x150
|
|
.L0x0160: .short 0x160
|
|
.L0x0170: .short 0x170
|
|
.Lcritical_start:
|
|
.quad __critical_start
|
|
.Lcritical_end:
|
|
.quad __critical_end
|
|
|
|
.section .rodata, "a"
|
|
#define SYSCALL(esa,esame,emu) .long esame
|
|
.globl sys_call_table
|
|
sys_call_table:
|
|
#include "syscalls.S"
|
|
#undef SYSCALL
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
|
|
#define SYSCALL(esa,esame,emu) .long emu
|
|
sys_call_table_emu:
|
|
#include "syscalls.S"
|
|
#undef SYSCALL
|
|
#endif
|