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21ec7f6dbf
If irq flags tracing is enabled the TRACE_IRQS_ON macros expands to a function call which clobbers registers %r0-%r5. The macro is used in the code path for single stepped system calls. The argument registers %r2-%r6 need to be restored from the stack before the system call function is called. Cc: stable@kernel.org Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
1129 lines
32 KiB
ArmAsm
1129 lines
32 KiB
ArmAsm
/*
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* arch/s390/kernel/entry.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 + 4
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SP_R2 = STACK_FRAME_OVERHEAD + __PT_GPRS + 8
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SP_R3 = STACK_FRAME_OVERHEAD + __PT_GPRS + 12
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SP_R4 = STACK_FRAME_OVERHEAD + __PT_GPRS + 16
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SP_R5 = STACK_FRAME_OVERHEAD + __PT_GPRS + 20
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SP_R6 = STACK_FRAME_OVERHEAD + __PT_GPRS + 24
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SP_R7 = STACK_FRAME_OVERHEAD + __PT_GPRS + 28
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SP_R8 = STACK_FRAME_OVERHEAD + __PT_GPRS + 32
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SP_R9 = STACK_FRAME_OVERHEAD + __PT_GPRS + 36
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SP_R10 = STACK_FRAME_OVERHEAD + __PT_GPRS + 40
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SP_R11 = STACK_FRAME_OVERHEAD + __PT_GPRS + 44
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SP_R12 = STACK_FRAME_OVERHEAD + __PT_GPRS + 48
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SP_R13 = STACK_FRAME_OVERHEAD + __PT_GPRS + 52
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SP_R14 = STACK_FRAME_OVERHEAD + __PT_GPRS + 56
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SP_R15 = STACK_FRAME_OVERHEAD + __PT_GPRS + 60
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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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_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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STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER
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STACK_SIZE = 1 << STACK_SHIFT
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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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l %r1,BASED(.Ltrace_irq_on_caller)
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basr %r14,%r1
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.endm
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.macro TRACE_IRQS_OFF
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basr %r2,%r0
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l %r1,BASED(.Ltrace_irq_off_caller)
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basr %r14,%r1
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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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l %r1,BASED(.Ltrace_irq_on_caller)
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basr %r14,%r1
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j 1f
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0: l %r1,BASED(.Ltrace_irq_off_caller)
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basr %r14,%r1
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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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l %r1,BASED(.Llockdep_sys_exit)
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basr %r14,%r1
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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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/*
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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 UPDATE_VTIME lc_from,lc_to,lc_sum
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lm %r10,%r11,\lc_from
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sl %r10,\lc_to
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sl %r11,\lc_to+4
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bc 3,BASED(0f)
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sl %r10,BASED(.Lc_1)
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0: al %r10,\lc_sum
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al %r11,\lc_sum+4
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bc 12,BASED(1f)
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al %r10,BASED(.Lc_1)
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1: stm %r10,%r11,\lc_sum
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.endm
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.macro SAVE_ALL_BASE savearea
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stm %r12,%r15,\savearea
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l %r13,__LC_SVC_NEW_PSW+4 # load &system_call to %r13
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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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l %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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bz BASED(2f) # skip stack setup save
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l %r15,__LC_KERNEL_STACK # problem state -> load ksp
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#ifdef CONFIG_CHECK_STACK
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b BASED(3f)
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2: tml %r15,STACK_SIZE - CONFIG_STACK_GUARD
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bz BASED(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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bnz BASED(1f) # from user -> load async stack
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clc \psworg+4(4),BASED(.Lcritical_end)
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bhe BASED(0f)
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clc \psworg+4(4),BASED(.Lcritical_start)
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bl BASED(0f)
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l %r14,BASED(.Lcleanup_critical)
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basr %r14,%r14
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tm 1(%r12),0x01 # retest problem state after cleanup
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bnz BASED(1f)
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0: l %r14,__LC_ASYNC_STACK # are we already on the async stack ?
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slr %r14,%r15
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sra %r14,STACK_SHIFT
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be BASED(2f)
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1: l %r15,__LC_ASYNC_STACK
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#ifdef CONFIG_CHECK_STACK
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b BASED(3f)
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2: tml %r15,STACK_SIZE - CONFIG_STACK_GUARD
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bz BASED(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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s %r15,BASED(.Lc_spsize) # make room for registers & psw
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mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack
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st %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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stm %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(16,%r15),\savearea # move %r12-%r15 to stack
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la %r12,0
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st %r12,__SF_BACKCHAIN(%r15) # clear back chain
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.endm
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.macro RESTORE_ALL psworg,sync
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mvc \psworg(8),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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lm %r0,%r15,SP_R0(%r15) # load gprs 0-15 of user
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stpt __LC_EXIT_TIMER
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lpsw \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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basr %r1,0
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__switch_to_base:
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tm __THREAD_per(%r3),0xe8 # new process is using per ?
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bz __switch_to_noper-__switch_to_base(%r1) # if not we're fine
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stctl %c9,%c11,__SF_EMPTY(%r15) # We are using per stuff
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clc __THREAD_per(12,%r3),__SF_EMPTY(%r15)
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be __switch_to_noper-__switch_to_base(%r1) # we got away w/o bashing TLB's
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lctl %c9,%c11,__THREAD_per(%r3) # Nope we didn't
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__switch_to_noper:
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l %r4,__THREAD_info(%r2) # get thread_info of prev
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tm __TI_flags+3(%r4),_TIF_MCCK_PENDING # machine check pending?
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bz __switch_to_no_mcck-__switch_to_base(%r1)
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ni __TI_flags+3(%r4),255-_TIF_MCCK_PENDING # clear flag in prev
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l %r4,__THREAD_info(%r3) # get thread_info of next
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oi __TI_flags+3(%r4),_TIF_MCCK_PENDING # set it in next
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__switch_to_no_mcck:
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stm %r6,%r15,__SF_GPRS(%r15)# store __switch_to registers of prev task
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st %r15,__THREAD_ksp(%r2) # store kernel stack to prev->tss.ksp
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l %r15,__THREAD_ksp(%r3) # load kernel stack from next->tss.ksp
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lm %r6,%r15,__SF_GPRS(%r15)# load __switch_to registers of next task
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st %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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l %r3,__THREAD_info(%r3) # load thread_info from task struct
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st %r3,__LC_THREAD_INFO
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ahi %r3,STACK_SIZE
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st %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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lh %r7,0x8a # 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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l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
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ltr %r7,%r7 # test for svc 0
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bnz BASED(sysc_nr_ok) # svc number > 0
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# svc 0: system call number in %r1
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cl %r1,BASED(.Lnr_syscalls)
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bnl BASED(sysc_nr_ok)
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lr %r7,%r1 # copy svc number to %r7
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sysc_nr_ok:
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mvc SP_ARGS(4,%r15),SP_R7(%r15)
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sysc_do_restart:
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sth %r7,SP_SVCNR(%r15)
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sll %r7,2 # svc number *4
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l %r8,BASED(.Lsysc_table)
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tm __TI_flags+2(%r9),_TIF_SYSCALL
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l %r8,0(%r7,%r8) # get system call addr.
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bnz BASED(sysc_tracesys)
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basr %r14,%r8 # call sys_xxxx
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st %r2,SP_R2(%r15) # store return value (change R2 on stack)
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sysc_return:
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tm __TI_flags+3(%r9),_TIF_WORK_SVC
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bnz BASED(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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la %r1,BASED(sysc_restore_trace_psw_addr)
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l %r1,0(%r1)
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lpsw 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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sysc_restore_trace_psw_addr:
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.long sysc_restore_trace_psw
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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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.long 0, sysc_restore_trace + 0x80000000
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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+3(%r9),_TIF_WORK_SVC
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bz BASED(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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bno BASED(sysc_restore)
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tm __TI_flags+3(%r9),_TIF_MCCK_PENDING
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bo BASED(sysc_mcck_pending)
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tm __TI_flags+3(%r9),_TIF_NEED_RESCHED
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bo BASED(sysc_reschedule)
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tm __TI_flags+3(%r9),_TIF_SIGPENDING
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bnz BASED(sysc_sigpending)
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tm __TI_flags+3(%r9),_TIF_NOTIFY_RESUME
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bnz BASED(sysc_notify_resume)
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tm __TI_flags+3(%r9),_TIF_RESTART_SVC
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bo BASED(sysc_restart)
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tm __TI_flags+3(%r9),_TIF_SINGLE_STEP
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bo BASED(sysc_singlestep)
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b BASED(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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l %r1,BASED(.Lschedule)
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la %r14,BASED(sysc_work_loop)
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br %r1 # call scheduler
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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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l %r1,BASED(.Ls390_handle_mcck)
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la %r14,BASED(sysc_work_loop)
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br %r1 # 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+3(%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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l %r1,BASED(.Ldo_signal)
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basr %r14,%r1 # call do_signal
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tm __TI_flags+3(%r9),_TIF_RESTART_SVC
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bo BASED(sysc_restart)
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tm __TI_flags+3(%r9),_TIF_SINGLE_STEP
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bo BASED(sysc_singlestep)
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b BASED(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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l %r1,BASED(.Ldo_notify_resume)
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la %r14,BASED(sysc_work_loop)
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br %r1 # 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+3(%r9),255-_TIF_RESTART_SVC # clear TIF_RESTART_SVC
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l %r7,SP_R2(%r15) # load new svc number
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mvc SP_R2(4,%r15),SP_ORIG_R2(%r15) # restore first argument
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lm %r2,%r6,SP_R2(%r15) # load svc arguments
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b BASED(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+3(%r9),255-_TIF_SINGLE_STEP # clear TIF_SINGLE_STEP
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mvi SP_SVCNR(%r15),0xff # set trap indication to pgm check
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mvi SP_SVCNR+1(%r15),0xff
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la %r2,SP_PTREGS(%r15) # address of register-save area
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l %r1,BASED(.Lhandle_per) # load adr. of per handler
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la %r14,BASED(sysc_return) # load adr. of system return
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br %r1 # branch to do_single_step
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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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l %r1,BASED(.Ltrace_entry)
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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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st %r7,SP_R2(%r15)
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basr %r14,%r1
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cl %r2,BASED(.Lnr_syscalls)
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bnl BASED(sysc_tracenogo)
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l %r8,BASED(.Lsysc_table)
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lr %r7,%r2
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sll %r7,2 # svc number *4
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l %r8,0(%r7,%r8)
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sysc_tracego:
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lm %r3,%r6,SP_R3(%r15)
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l %r2,SP_ORIG_R2(%r15)
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|
basr %r14,%r8 # call sys_xxx
|
|
st %r2,SP_R2(%r15) # store return value
|
|
sysc_tracenogo:
|
|
tm __TI_flags+2(%r9),_TIF_SYSCALL
|
|
bz BASED(sysc_return)
|
|
l %r1,BASED(.Ltrace_exit)
|
|
la %r2,SP_PTREGS(%r15) # load pt_regs
|
|
la %r14,BASED(sysc_return)
|
|
br %r1
|
|
|
|
#
|
|
# a new process exits the kernel with ret_from_fork
|
|
#
|
|
.globl ret_from_fork
|
|
ret_from_fork:
|
|
l %r13,__LC_SVC_NEW_PSW+4
|
|
l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
|
|
tm SP_PSW+1(%r15),0x01 # forking a kernel thread ?
|
|
bo BASED(0f)
|
|
st %r15,SP_R15(%r15) # store stack pointer for new kthread
|
|
0: l %r1,BASED(.Lschedtail)
|
|
basr %r14,%r1
|
|
TRACE_IRQS_ON
|
|
stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
|
|
b BASED(sysc_tracenogo)
|
|
|
|
#
|
|
# kernel_execve function needs to deal with pt_regs that is not
|
|
# at the usual place
|
|
#
|
|
.globl kernel_execve
|
|
kernel_execve:
|
|
stm %r12,%r15,48(%r15)
|
|
lr %r14,%r15
|
|
l %r13,__LC_SVC_NEW_PSW+4
|
|
s %r15,BASED(.Lc_spsize)
|
|
st %r14,__SF_BACKCHAIN(%r15)
|
|
la %r12,SP_PTREGS(%r15)
|
|
xc 0(__PT_SIZE,%r12),0(%r12)
|
|
l %r1,BASED(.Ldo_execve)
|
|
lr %r5,%r12
|
|
basr %r14,%r1
|
|
ltr %r2,%r2
|
|
be BASED(0f)
|
|
a %r15,BASED(.Lc_spsize)
|
|
lm %r12,%r15,48(%r15)
|
|
br %r14
|
|
# execve succeeded.
|
|
0: stnsm __SF_EMPTY(%r15),0xfc # disable interrupts
|
|
l %r15,__LC_KERNEL_STACK # load ksp
|
|
s %r15,BASED(.Lc_spsize) # make room for registers & psw
|
|
l %r9,__LC_THREAD_INFO
|
|
mvc SP_PTREGS(__PT_SIZE,%r15),0(%r12) # copy pt_regs
|
|
xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15)
|
|
stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
|
|
l %r1,BASED(.Lexecve_tail)
|
|
basr %r14,%r1
|
|
b BASED(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
|
|
bnz BASED(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 ?
|
|
bz BASED(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:
|
|
l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
|
|
TRACE_IRQS_OFF
|
|
l %r3,__LC_PGM_ILC # load program interruption code
|
|
la %r8,0x7f
|
|
nr %r8,%r3
|
|
pgm_do_call:
|
|
l %r7,BASED(.Ljump_table)
|
|
sll %r8,2
|
|
l %r7,0(%r8,%r7) # load address of handler routine
|
|
la %r2,SP_PTREGS(%r15) # address of register-save area
|
|
la %r14,BASED(sysc_return)
|
|
br %r7 # branch to interrupt-handler
|
|
|
|
#
|
|
# handle per exception
|
|
#
|
|
pgm_per:
|
|
tm __LC_PGM_OLD_PSW,0x40 # test if per event recording is on
|
|
bnz BASED(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(8),__LC_SVC_NEW_PSW
|
|
be BASED(pgm_svcper)
|
|
# no interesting special case, ignore PER event
|
|
lm %r12,%r15,__LC_SAVE_AREA
|
|
lpsw 0x28
|
|
|
|
#
|
|
# 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 ?
|
|
bz BASED(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:
|
|
l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
|
|
TRACE_IRQS_OFF
|
|
l %r1,__TI_task(%r9)
|
|
mvc __THREAD_per+__PER_atmid(2,%r1),__LC_PER_ATMID
|
|
mvc __THREAD_per+__PER_address(4,%r1),__LC_PER_ADDRESS
|
|
mvc __THREAD_per+__PER_access_id(1,%r1),__LC_PER_ACCESS_ID
|
|
oi __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP
|
|
tm SP_PSW+1(%r15),0x01 # kernel per event ?
|
|
bz BASED(kernel_per)
|
|
l %r3,__LC_PGM_ILC # load program interruption code
|
|
la %r8,0x7f
|
|
nr %r8,%r3 # clear per-event-bit and ilc
|
|
be BASED(sysc_return) # only per or per+check ?
|
|
b BASED(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
|
|
lh %r7,0x8a # get svc number from lowcore
|
|
l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
|
|
TRACE_IRQS_OFF
|
|
l %r8,__TI_task(%r9)
|
|
mvc __THREAD_per+__PER_atmid(2,%r8),__LC_PER_ATMID
|
|
mvc __THREAD_per+__PER_address(4,%r8),__LC_PER_ADDRESS
|
|
mvc __THREAD_per+__PER_access_id(1,%r8),__LC_PER_ACCESS_ID
|
|
oi __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP
|
|
TRACE_IRQS_ON
|
|
lm %r2,%r6,SP_R2(%r15) # load svc arguments
|
|
stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
|
|
b BASED(sysc_do_svc)
|
|
|
|
#
|
|
# per was called from kernel, must be kprobes
|
|
#
|
|
kernel_per:
|
|
mvi SP_SVCNR(%r15),0xff # set trap indication to pgm check
|
|
mvi SP_SVCNR+1(%r15),0xff
|
|
la %r2,SP_PTREGS(%r15) # address of register-save area
|
|
l %r1,BASED(.Lhandle_per) # load adr. of per handler
|
|
la %r14,BASED(sysc_restore)# load adr. of system return
|
|
br %r1 # 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+16
|
|
SAVE_ALL_ASYNC __LC_IO_OLD_PSW,__LC_SAVE_AREA+16
|
|
CREATE_STACK_FRAME __LC_IO_OLD_PSW,__LC_SAVE_AREA+16
|
|
tm SP_PSW+1(%r15),0x01 # interrupting from user ?
|
|
bz BASED(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:
|
|
l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
|
|
TRACE_IRQS_OFF
|
|
l %r1,BASED(.Ldo_IRQ) # load address of do_IRQ
|
|
la %r2,SP_PTREGS(%r15) # address of register-save area
|
|
basr %r14,%r1 # branch to standard irq handler
|
|
io_return:
|
|
tm __TI_flags+3(%r9),_TIF_WORK_INT
|
|
bnz BASED(io_work) # there is work to do (signals etc.)
|
|
io_restore:
|
|
#ifdef CONFIG_TRACE_IRQFLAGS
|
|
la %r1,BASED(io_restore_trace_psw_addr)
|
|
l %r1,0(%r1)
|
|
lpsw 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
|
|
io_restore_trace_psw_addr:
|
|
.long io_restore_trace_psw
|
|
|
|
.section .data,"aw",@progbits
|
|
.align 8
|
|
.globl io_restore_trace_psw
|
|
io_restore_trace_psw:
|
|
.long 0, io_restore_trace + 0x80000000
|
|
.previous
|
|
#endif
|
|
|
|
#
|
|
# switch to kernel stack, then check the TIF bits
|
|
#
|
|
io_work:
|
|
tm SP_PSW+1(%r15),0x01 # returning to user ?
|
|
#ifndef CONFIG_PREEMPT
|
|
bno BASED(io_restore) # no-> skip resched & signal
|
|
#else
|
|
bnz BASED(io_work_user) # no -> check for preemptive scheduling
|
|
# check for preemptive scheduling
|
|
icm %r0,15,__TI_precount(%r9)
|
|
bnz BASED(io_restore) # preemption disabled
|
|
l %r1,SP_R15(%r15)
|
|
s %r1,BASED(.Lc_spsize)
|
|
mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
|
|
xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain
|
|
lr %r15,%r1
|
|
io_resume_loop:
|
|
tm __TI_flags+3(%r9),_TIF_NEED_RESCHED
|
|
bno BASED(io_restore)
|
|
l %r1,BASED(.Lpreempt_schedule_irq)
|
|
la %r14,BASED(io_resume_loop)
|
|
br %r1 # call schedule
|
|
#endif
|
|
|
|
io_work_user:
|
|
l %r1,__LC_KERNEL_STACK
|
|
s %r1,BASED(.Lc_spsize)
|
|
mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
|
|
xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain
|
|
lr %r15,%r1
|
|
#
|
|
# One of the work bits is on. Find out which one.
|
|
# Checked are: _TIF_SIGPENDING, _TIF_NEED_RESCHED
|
|
# and _TIF_MCCK_PENDING
|
|
#
|
|
io_work_loop:
|
|
tm __TI_flags+3(%r9),_TIF_MCCK_PENDING
|
|
bo BASED(io_mcck_pending)
|
|
tm __TI_flags+3(%r9),_TIF_NEED_RESCHED
|
|
bo BASED(io_reschedule)
|
|
tm __TI_flags+3(%r9),_TIF_SIGPENDING
|
|
bnz BASED(io_sigpending)
|
|
tm __TI_flags+3(%r9),_TIF_NOTIFY_RESUME
|
|
bnz BASED(io_notify_resume)
|
|
b BASED(io_restore)
|
|
io_work_done:
|
|
|
|
#
|
|
# _TIF_MCCK_PENDING is set, call handler
|
|
#
|
|
io_mcck_pending:
|
|
l %r1,BASED(.Ls390_handle_mcck)
|
|
basr %r14,%r1 # TIF bit will be cleared by handler
|
|
b BASED(io_work_loop)
|
|
|
|
#
|
|
# _TIF_NEED_RESCHED is set, call schedule
|
|
#
|
|
io_reschedule:
|
|
TRACE_IRQS_ON
|
|
l %r1,BASED(.Lschedule)
|
|
stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
|
|
basr %r14,%r1 # call scheduler
|
|
stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts
|
|
TRACE_IRQS_OFF
|
|
tm __TI_flags+3(%r9),_TIF_WORK_INT
|
|
bz BASED(io_restore) # there is no work to do
|
|
b BASED(io_work_loop)
|
|
|
|
#
|
|
# _TIF_SIGPENDING 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
|
|
l %r1,BASED(.Ldo_signal)
|
|
basr %r14,%r1 # call do_signal
|
|
stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts
|
|
TRACE_IRQS_OFF
|
|
b BASED(io_work_loop)
|
|
|
|
#
|
|
# _TIF_SIGPENDING is set, call do_signal
|
|
#
|
|
io_notify_resume:
|
|
TRACE_IRQS_ON
|
|
stosm __SF_EMPTY(%r15),0x03 # reenable interrupts
|
|
la %r2,SP_PTREGS(%r15) # load pt_regs
|
|
l %r1,BASED(.Ldo_notify_resume)
|
|
basr %r14,%r1 # call do_signal
|
|
stnsm __SF_EMPTY(%r15),0xfc # disable I/O and ext. interrupts
|
|
TRACE_IRQS_OFF
|
|
b BASED(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+16
|
|
SAVE_ALL_ASYNC __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16
|
|
CREATE_STACK_FRAME __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16
|
|
tm SP_PSW+1(%r15),0x01 # interrupting from user ?
|
|
bz BASED(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:
|
|
l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
|
|
TRACE_IRQS_OFF
|
|
la %r2,SP_PTREGS(%r15) # address of register-save area
|
|
lh %r3,__LC_EXT_INT_CODE # get interruption code
|
|
l %r1,BASED(.Ldo_extint)
|
|
basr %r14,%r1
|
|
b BASED(io_return)
|
|
|
|
__critical_end:
|
|
|
|
/*
|
|
* Machine check handler routines
|
|
*/
|
|
|
|
.globl mcck_int_handler
|
|
mcck_int_handler:
|
|
stck __LC_INT_CLOCK
|
|
spt __LC_CPU_TIMER_SAVE_AREA # revalidate cpu timer
|
|
lm %r0,%r15,__LC_GPREGS_SAVE_AREA # revalidate gprs
|
|
SAVE_ALL_BASE __LC_SAVE_AREA+32
|
|
la %r12,__LC_MCK_OLD_PSW
|
|
tm __LC_MCCK_CODE,0x80 # system damage?
|
|
bo BASED(mcck_int_main) # yes -> rest of mcck code invalid
|
|
mvc __LC_SAVE_AREA+52(8),__LC_ASYNC_ENTER_TIMER
|
|
mvc __LC_ASYNC_ENTER_TIMER(8),__LC_CPU_TIMER_SAVE_AREA
|
|
tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid?
|
|
bo BASED(1f)
|
|
la %r14,__LC_SYNC_ENTER_TIMER
|
|
clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER
|
|
bl BASED(0f)
|
|
la %r14,__LC_ASYNC_ENTER_TIMER
|
|
0: clc 0(8,%r14),__LC_EXIT_TIMER
|
|
bl BASED(0f)
|
|
la %r14,__LC_EXIT_TIMER
|
|
0: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER
|
|
bl BASED(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?
|
|
bno BASED(mcck_int_main) # no -> skip cleanup critical
|
|
tm __LC_MCK_OLD_PSW+1,0x01 # test problem state bit
|
|
bnz BASED(mcck_int_main) # from user -> load async stack
|
|
clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_end)
|
|
bhe BASED(mcck_int_main)
|
|
clc __LC_MCK_OLD_PSW+4(4),BASED(.Lcritical_start)
|
|
bl BASED(mcck_int_main)
|
|
l %r14,BASED(.Lcleanup_critical)
|
|
basr %r14,%r14
|
|
mcck_int_main:
|
|
l %r14,__LC_PANIC_STACK # are we already on the panic stack?
|
|
slr %r14,%r15
|
|
sra %r14,PAGE_SHIFT
|
|
be BASED(0f)
|
|
l %r15,__LC_PANIC_STACK # load panic stack
|
|
0: CREATE_STACK_FRAME __LC_MCK_OLD_PSW,__LC_SAVE_AREA+32
|
|
tm __LC_MCCK_CODE+2,0x08 # mwp of old psw valid?
|
|
bno BASED(mcck_no_vtime) # no -> skip cleanup critical
|
|
tm SP_PSW+1(%r15),0x01 # interrupting from user ?
|
|
bz BASED(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:
|
|
l %r9,__LC_THREAD_INFO # load pointer to thread_info struct
|
|
la %r2,SP_PTREGS(%r15) # load pt_regs
|
|
l %r1,BASED(.Ls390_mcck)
|
|
basr %r14,%r1 # call machine check handler
|
|
tm SP_PSW+1(%r15),0x01 # returning to user ?
|
|
bno BASED(mcck_return)
|
|
l %r1,__LC_KERNEL_STACK # switch to kernel stack
|
|
s %r1,BASED(.Lc_spsize)
|
|
mvc SP_PTREGS(__PT_SIZE,%r1),SP_PTREGS(%r15)
|
|
xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) # clear back chain
|
|
lr %r15,%r1
|
|
stosm __SF_EMPTY(%r15),0x04 # turn dat on
|
|
tm __TI_flags+3(%r9),_TIF_MCCK_PENDING
|
|
bno BASED(mcck_return)
|
|
TRACE_IRQS_OFF
|
|
l %r1,BASED(.Ls390_handle_mcck)
|
|
basr %r14,%r1 # call machine check handler
|
|
TRACE_IRQS_ON
|
|
mcck_return:
|
|
mvc __LC_RETURN_MCCK_PSW(8),SP_PSW(%r15) # move return PSW
|
|
ni __LC_RETURN_MCCK_PSW+1,0xfd # clear wait state bit
|
|
mvc __LC_ASYNC_ENTER_TIMER(8),__LC_SAVE_AREA+52
|
|
tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ?
|
|
bno BASED(0f)
|
|
lm %r0,%r15,SP_R0(%r15) # load gprs 0-15
|
|
stpt __LC_EXIT_TIMER
|
|
lpsw __LC_RETURN_MCCK_PSW # back to caller
|
|
0: lm %r0,%r15,SP_R0(%r15) # load gprs 0-15
|
|
lpsw __LC_RETURN_MCCK_PSW # back to caller
|
|
|
|
RESTORE_ALL __LC_RETURN_MCCK_PSW,0
|
|
|
|
/*
|
|
* 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)
|
|
l %r15,__LC_SAVE_AREA+60 # load ksp
|
|
lctl %c0,%c15,__LC_CREGS_SAVE_AREA # get new ctl regs
|
|
lam %a0,%a15,__LC_AREGS_SAVE_AREA
|
|
lm %r6,%r15,__SF_GPRS(%r15) # load registers from clone
|
|
l %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
|
|
basr %r14,0
|
|
l %r14,restart_addr-.(%r14)
|
|
br %r14 # branch to start_secondary
|
|
restart_addr:
|
|
.long 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:
|
|
lpsw restart_crash-restart_base(%r1)
|
|
.align 8
|
|
restart_crash:
|
|
.long 0x000a0000,0x00000000
|
|
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:
|
|
l %r15,__LC_PANIC_STACK # change to panic stack
|
|
sl %r15,BASED(.Lc_spsize)
|
|
mvc SP_PSW(8,%r15),0(%r12) # move user PSW to stack
|
|
stm %r0,%r11,SP_R0(%r15) # store gprs %r0-%r11 to kernel stack
|
|
la %r1,__LC_SAVE_AREA
|
|
ch %r12,BASED(.L0x020) # old psw addr == __LC_SVC_OLD_PSW ?
|
|
be BASED(0f)
|
|
ch %r12,BASED(.L0x028) # old psw addr == __LC_PGM_OLD_PSW ?
|
|
be BASED(0f)
|
|
la %r1,__LC_SAVE_AREA+16
|
|
0: mvc SP_R12(16,%r15),0(%r1) # move %r12-%r15 to stack
|
|
xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) # clear back chain
|
|
l %r1,BASED(1f) # branch to kernel_stack_overflow
|
|
la %r2,SP_PTREGS(%r15) # load pt_regs
|
|
br %r1
|
|
1: .long kernel_stack_overflow
|
|
#endif
|
|
|
|
cleanup_table_system_call:
|
|
.long system_call + 0x80000000, sysc_do_svc + 0x80000000
|
|
cleanup_table_sysc_return:
|
|
.long sysc_return + 0x80000000, sysc_leave + 0x80000000
|
|
cleanup_table_sysc_leave:
|
|
.long sysc_leave + 0x80000000, sysc_done + 0x80000000
|
|
cleanup_table_sysc_work_loop:
|
|
.long sysc_work_loop + 0x80000000, sysc_work_done + 0x80000000
|
|
cleanup_table_io_return:
|
|
.long io_return + 0x80000000, io_leave + 0x80000000
|
|
cleanup_table_io_leave:
|
|
.long io_leave + 0x80000000, io_done + 0x80000000
|
|
cleanup_table_io_work_loop:
|
|
.long io_work_loop + 0x80000000, io_work_done + 0x80000000
|
|
|
|
cleanup_critical:
|
|
clc 4(4,%r12),BASED(cleanup_table_system_call)
|
|
bl BASED(0f)
|
|
clc 4(4,%r12),BASED(cleanup_table_system_call+4)
|
|
bl BASED(cleanup_system_call)
|
|
0:
|
|
clc 4(4,%r12),BASED(cleanup_table_sysc_return)
|
|
bl BASED(0f)
|
|
clc 4(4,%r12),BASED(cleanup_table_sysc_return+4)
|
|
bl BASED(cleanup_sysc_return)
|
|
0:
|
|
clc 4(4,%r12),BASED(cleanup_table_sysc_leave)
|
|
bl BASED(0f)
|
|
clc 4(4,%r12),BASED(cleanup_table_sysc_leave+4)
|
|
bl BASED(cleanup_sysc_leave)
|
|
0:
|
|
clc 4(4,%r12),BASED(cleanup_table_sysc_work_loop)
|
|
bl BASED(0f)
|
|
clc 4(4,%r12),BASED(cleanup_table_sysc_work_loop+4)
|
|
bl BASED(cleanup_sysc_return)
|
|
0:
|
|
clc 4(4,%r12),BASED(cleanup_table_io_return)
|
|
bl BASED(0f)
|
|
clc 4(4,%r12),BASED(cleanup_table_io_return+4)
|
|
bl BASED(cleanup_io_return)
|
|
0:
|
|
clc 4(4,%r12),BASED(cleanup_table_io_leave)
|
|
bl BASED(0f)
|
|
clc 4(4,%r12),BASED(cleanup_table_io_leave+4)
|
|
bl BASED(cleanup_io_leave)
|
|
0:
|
|
clc 4(4,%r12),BASED(cleanup_table_io_work_loop)
|
|
bl BASED(0f)
|
|
clc 4(4,%r12),BASED(cleanup_table_io_work_loop+4)
|
|
bl BASED(cleanup_io_return)
|
|
0:
|
|
br %r14
|
|
|
|
cleanup_system_call:
|
|
mvc __LC_RETURN_PSW(8),0(%r12)
|
|
c %r12,BASED(.Lmck_old_psw)
|
|
be BASED(0f)
|
|
la %r12,__LC_SAVE_AREA+16
|
|
b BASED(1f)
|
|
0: la %r12,__LC_SAVE_AREA+32
|
|
1:
|
|
clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+4)
|
|
bh BASED(0f)
|
|
mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER
|
|
0: clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+8)
|
|
bhe BASED(cleanup_vtime)
|
|
clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn)
|
|
bh BASED(0f)
|
|
mvc __LC_SAVE_AREA(16),0(%r12)
|
|
0: st %r13,4(%r12)
|
|
st %r12,__LC_SAVE_AREA+48 # argh
|
|
SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
|
|
CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
|
|
l %r12,__LC_SAVE_AREA+48 # argh
|
|
st %r15,12(%r12)
|
|
lh %r7,0x8a
|
|
cleanup_vtime:
|
|
clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+12)
|
|
bhe BASED(cleanup_stime)
|
|
UPDATE_VTIME __LC_EXIT_TIMER,__LC_SYNC_ENTER_TIMER,__LC_USER_TIMER
|
|
cleanup_stime:
|
|
clc __LC_RETURN_PSW+4(4),BASED(cleanup_system_call_insn+16)
|
|
bh BASED(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+4(4),BASED(cleanup_table_system_call+4)
|
|
la %r12,__LC_RETURN_PSW
|
|
br %r14
|
|
cleanup_system_call_insn:
|
|
.long sysc_saveall + 0x80000000
|
|
.long system_call + 0x80000000
|
|
.long sysc_vtime + 0x80000000
|
|
.long sysc_stime + 0x80000000
|
|
.long sysc_update + 0x80000000
|
|
|
|
cleanup_sysc_return:
|
|
mvc __LC_RETURN_PSW(4),0(%r12)
|
|
mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_sysc_return)
|
|
la %r12,__LC_RETURN_PSW
|
|
br %r14
|
|
|
|
cleanup_sysc_leave:
|
|
clc 4(4,%r12),BASED(cleanup_sysc_leave_insn)
|
|
be BASED(2f)
|
|
mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
|
|
clc 4(4,%r12),BASED(cleanup_sysc_leave_insn+4)
|
|
be BASED(2f)
|
|
mvc __LC_RETURN_PSW(8),SP_PSW(%r15)
|
|
c %r12,BASED(.Lmck_old_psw)
|
|
bne BASED(0f)
|
|
mvc __LC_SAVE_AREA+32(16),SP_R12(%r15)
|
|
b BASED(1f)
|
|
0: mvc __LC_SAVE_AREA+16(16),SP_R12(%r15)
|
|
1: lm %r0,%r11,SP_R0(%r15)
|
|
l %r15,SP_R15(%r15)
|
|
2: la %r12,__LC_RETURN_PSW
|
|
br %r14
|
|
cleanup_sysc_leave_insn:
|
|
.long sysc_done - 4 + 0x80000000
|
|
.long sysc_done - 8 + 0x80000000
|
|
|
|
cleanup_io_return:
|
|
mvc __LC_RETURN_PSW(4),0(%r12)
|
|
mvc __LC_RETURN_PSW+4(4),BASED(cleanup_table_io_work_loop)
|
|
la %r12,__LC_RETURN_PSW
|
|
br %r14
|
|
|
|
cleanup_io_leave:
|
|
clc 4(4,%r12),BASED(cleanup_io_leave_insn)
|
|
be BASED(2f)
|
|
mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER
|
|
clc 4(4,%r12),BASED(cleanup_io_leave_insn+4)
|
|
be BASED(2f)
|
|
mvc __LC_RETURN_PSW(8),SP_PSW(%r15)
|
|
c %r12,BASED(.Lmck_old_psw)
|
|
bne BASED(0f)
|
|
mvc __LC_SAVE_AREA+32(16),SP_R12(%r15)
|
|
b BASED(1f)
|
|
0: mvc __LC_SAVE_AREA+16(16),SP_R12(%r15)
|
|
1: lm %r0,%r11,SP_R0(%r15)
|
|
l %r15,SP_R15(%r15)
|
|
2: la %r12,__LC_RETURN_PSW
|
|
br %r14
|
|
cleanup_io_leave_insn:
|
|
.long io_done - 4 + 0x80000000
|
|
.long io_done - 8 + 0x80000000
|
|
|
|
/*
|
|
* Integer constants
|
|
*/
|
|
.align 4
|
|
.Lc_spsize: .long SP_SIZE
|
|
.Lc_overhead: .long STACK_FRAME_OVERHEAD
|
|
.Lnr_syscalls: .long NR_syscalls
|
|
.L0x018: .short 0x018
|
|
.L0x020: .short 0x020
|
|
.L0x028: .short 0x028
|
|
.L0x030: .short 0x030
|
|
.L0x038: .short 0x038
|
|
.Lc_1: .long 1
|
|
|
|
/*
|
|
* Symbol constants
|
|
*/
|
|
.Ls390_mcck: .long s390_do_machine_check
|
|
.Ls390_handle_mcck:
|
|
.long s390_handle_mcck
|
|
.Lmck_old_psw: .long __LC_MCK_OLD_PSW
|
|
.Ldo_IRQ: .long do_IRQ
|
|
.Ldo_extint: .long do_extint
|
|
.Ldo_signal: .long do_signal
|
|
.Ldo_notify_resume:
|
|
.long do_notify_resume
|
|
.Lhandle_per: .long do_single_step
|
|
.Ldo_execve: .long do_execve
|
|
.Lexecve_tail: .long execve_tail
|
|
.Ljump_table: .long pgm_check_table
|
|
.Lschedule: .long schedule
|
|
#ifdef CONFIG_PREEMPT
|
|
.Lpreempt_schedule_irq:
|
|
.long preempt_schedule_irq
|
|
#endif
|
|
.Ltrace_entry: .long do_syscall_trace_enter
|
|
.Ltrace_exit: .long do_syscall_trace_exit
|
|
.Lschedtail: .long schedule_tail
|
|
.Lsysc_table: .long sys_call_table
|
|
#ifdef CONFIG_TRACE_IRQFLAGS
|
|
.Ltrace_irq_on_caller:
|
|
.long trace_hardirqs_on_caller
|
|
.Ltrace_irq_off_caller:
|
|
.long trace_hardirqs_off_caller
|
|
#endif
|
|
#ifdef CONFIG_LOCKDEP
|
|
.Llockdep_sys_exit:
|
|
.long lockdep_sys_exit
|
|
#endif
|
|
.Lcritical_start:
|
|
.long __critical_start + 0x80000000
|
|
.Lcritical_end:
|
|
.long __critical_end + 0x80000000
|
|
.Lcleanup_critical:
|
|
.long cleanup_critical
|
|
|
|
.section .rodata, "a"
|
|
#define SYSCALL(esa,esame,emu) .long esa
|
|
.globl sys_call_table
|
|
sys_call_table:
|
|
#include "syscalls.S"
|
|
#undef SYSCALL
|