/*
* arch/s390/kernel/entry64.S
* S390 low-level entry points.
*
* Copyright (C) IBM Corp. 1999,2010
* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
* Hartmut Penner (hp@de.ibm.com),
* Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
* Heiko Carstens <heiko.carstens@de.ibm.com>
*/
#include <linux/init.h>
#include <linux/linkage.h>
#include <asm/cache.h>
#include <asm/errno.h>
#include <asm/ptrace.h>
#include <asm/thread_info.h>
#include <asm/asm-offsets.h>
#include <asm/unistd.h>
#include <asm/page.h>
/*
* Stack layout for the system_call stack entry.
* The first few entries are identical to the user_regs_struct.
*/
SP_PTREGS = STACK_FRAME_OVERHEAD
SP_ARGS = STACK_FRAME_OVERHEAD + __PT_ARGS
SP_PSW = STACK_FRAME_OVERHEAD + __PT_PSW
SP_R0 = STACK_FRAME_OVERHEAD + __PT_GPRS
SP_R1 = STACK_FRAME_OVERHEAD + __PT_GPRS + 8
SP_R2 = STACK_FRAME_OVERHEAD + __PT_GPRS + 16
SP_R3 = STACK_FRAME_OVERHEAD + __PT_GPRS + 24
SP_R4 = STACK_FRAME_OVERHEAD + __PT_GPRS + 32
SP_R5 = STACK_FRAME_OVERHEAD + __PT_GPRS + 40
SP_R6 = STACK_FRAME_OVERHEAD + __PT_GPRS + 48
SP_R7 = STACK_FRAME_OVERHEAD + __PT_GPRS + 56
SP_R8 = STACK_FRAME_OVERHEAD + __PT_GPRS + 64
SP_R9 = STACK_FRAME_OVERHEAD + __PT_GPRS + 72
SP_R10 = STACK_FRAME_OVERHEAD + __PT_GPRS + 80
SP_R11 = STACK_FRAME_OVERHEAD + __PT_GPRS + 88
SP_R12 = STACK_FRAME_OVERHEAD + __PT_GPRS + 96
SP_R13 = STACK_FRAME_OVERHEAD + __PT_GPRS + 104
SP_R14 = STACK_FRAME_OVERHEAD + __PT_GPRS + 112
SP_R15 = STACK_FRAME_OVERHEAD + __PT_GPRS + 120
SP_ORIG_R2 = STACK_FRAME_OVERHEAD + __PT_ORIG_GPR2
SP_ILC = STACK_FRAME_OVERHEAD + __PT_ILC
SP_SVCNR = STACK_FRAME_OVERHEAD + __PT_SVCNR
SP_SIZE = STACK_FRAME_OVERHEAD + __PT_SIZE
STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER
STACK_SIZE = 1 << STACK_SHIFT
_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
_TIF_MCCK_PENDING | _TIF_RESTART_SVC | _TIF_PER_TRAP )
_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \
_TIF_MCCK_PENDING)
_TIF_SYSCALL = (_TIF_SYSCALL_TRACE>>8 | _TIF_SYSCALL_AUDIT>>8 | \
_TIF_SECCOMP>>8 | _TIF_SYSCALL_TRACEPOINT>>8)
_TIF_EXIT_SIE = (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_MCCK_PENDING)
#define BASED(name) name-system_call(%r13)
.macro SPP newpp
#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE)
tm __LC_MACHINE_FLAGS+6,0x20 # MACHINE_FLAG_SPP
jz .+8
.insn s,0xb2800000,\newpp
#endif
.endm
.macro HANDLE_SIE_INTERCEPT
#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE)
tm __TI_flags+6(%r12),_TIF_SIE>>8
jz 0f
SPP __LC_CMF_HPP # set host id
clc SP_PSW+8(8,%r15),BASED(.Lsie_loop)
jl 0f
clc SP_PSW+8(8,%r15),BASED(.Lsie_done)
jhe 0f
mvc SP_PSW+8(8,%r15),BASED(.Lsie_loop)
0:
#endif
.endm
#ifdef CONFIG_TRACE_IRQFLAGS
.macro TRACE_IRQS_ON
basr %r2,%r0
brasl %r14,trace_hardirqs_on_caller
.endm
.macro TRACE_IRQS_OFF
basr %r2,%r0
brasl %r14,trace_hardirqs_off_caller
.endm
#else
#define TRACE_IRQS_ON
#define TRACE_IRQS_OFF
#endif
#ifdef CONFIG_LOCKDEP
.macro LOCKDEP_SYS_EXIT
tm SP_PSW+1(%r15),0x01 # returning to user ?
jz 0f
brasl %r14,lockdep_sys_exit
0:
.endm
#else
#define LOCKDEP_SYS_EXIT
#endif
.macro UPDATE_VTIME lc_from,lc_to,lc_sum
lg %r10,\lc_from
slg %r10,\lc_to
alg %r10,\lc_sum
stg %r10,\lc_sum
.endm
/*
* Register usage in inte