diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/s390/kernel/entry.S')
| -rw-r--r-- | ANDROID_3.4.5/arch/s390/kernel/entry.S | 967 |
1 files changed, 0 insertions, 967 deletions
diff --git a/ANDROID_3.4.5/arch/s390/kernel/entry.S b/ANDROID_3.4.5/arch/s390/kernel/entry.S deleted file mode 100644 index 74ee563f..00000000 --- a/ANDROID_3.4.5/arch/s390/kernel/entry.S +++ /dev/null @@ -1,967 +0,0 @@ -/* - * arch/s390/kernel/entry.S - * S390 low-level entry points. - * - * Copyright (C) IBM Corp. 1999,2012 - * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), - * Hartmut Penner (hp@de.ibm.com), - * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com), - * Heiko Carstens <heiko.carstens@de.ibm.com> - */ - -#include <linux/init.h> -#include <linux/linkage.h> -#include <asm/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> - -__PT_R0 = __PT_GPRS -__PT_R1 = __PT_GPRS + 4 -__PT_R2 = __PT_GPRS + 8 -__PT_R3 = __PT_GPRS + 12 -__PT_R4 = __PT_GPRS + 16 -__PT_R5 = __PT_GPRS + 20 -__PT_R6 = __PT_GPRS + 24 -__PT_R7 = __PT_GPRS + 28 -__PT_R8 = __PT_GPRS + 32 -__PT_R9 = __PT_GPRS + 36 -__PT_R10 = __PT_GPRS + 40 -__PT_R11 = __PT_GPRS + 44 -__PT_R12 = __PT_GPRS + 48 -__PT_R13 = __PT_GPRS + 524 -__PT_R14 = __PT_GPRS + 56 -__PT_R15 = __PT_GPRS + 60 - -_TIF_WORK_SVC = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ - _TIF_MCCK_PENDING | _TIF_PER_TRAP ) -_TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ - _TIF_MCCK_PENDING) -_TIF_TRACE = (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \ - _TIF_SYSCALL_TRACEPOINT) - -STACK_SHIFT = PAGE_SHIFT + THREAD_ORDER -STACK_SIZE = 1 << STACK_SHIFT - -#define BASED(name) name-system_call(%r13) - - .macro TRACE_IRQS_ON -#ifdef CONFIG_TRACE_IRQFLAGS - basr %r2,%r0 - l %r1,BASED(.Lhardirqs_on) - basr %r14,%r1 # call trace_hardirqs_on_caller -#endif - .endm - - .macro TRACE_IRQS_OFF -#ifdef CONFIG_TRACE_IRQFLAGS - basr %r2,%r0 - l %r1,BASED(.Lhardirqs_off) - basr %r14,%r1 # call trace_hardirqs_off_caller -#endif - .endm - - .macro LOCKDEP_SYS_EXIT -#ifdef CONFIG_LOCKDEP - tm __PT_PSW+1(%r11),0x01 # returning to user ? - jz .+10 - l %r1,BASED(.Llockdep_sys_exit) - basr %r14,%r1 # call lockdep_sys_exit -#endif - .endm - - .macro CHECK_STACK stacksize,savearea -#ifdef CONFIG_CHECK_STACK - tml %r15,\stacksize - CONFIG_STACK_GUARD - la %r14,\savearea - jz stack_overflow -#endif - .endm - - .macro SWITCH_ASYNC savearea,stack,shift - tmh %r8,0x0001 # interrupting from user ? - jnz 1f - lr %r14,%r9 - sl %r14,BASED(.Lcritical_start) - cl %r14,BASED(.Lcritical_length) - jhe 0f - la %r11,\savearea # inside critical section, do cleanup - bras %r14,cleanup_critical - tmh %r8,0x0001 # retest problem state after cleanup - jnz 1f -0: l %r14,\stack # are we already on the target stack? - slr %r14,%r15 - sra %r14,\shift - jnz 1f - CHECK_STACK 1<<\shift,\savearea - j 2f -1: l %r15,\stack # load target stack -2: ahi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) - la %r11,STACK_FRAME_OVERHEAD(%r15) - .endm - - .macro ADD64 high,low,timer - al \high,\timer - al \low,4+\timer - brc 12,.+8 - ahi \high,1 - .endm - - .macro SUB64 high,low,timer - sl \high,\timer - sl \low,4+\timer - brc 3,.+8 - ahi \high,-1 - .endm - - .macro UPDATE_VTIME high,low,enter_timer - lm \high,\low,__LC_EXIT_TIMER - SUB64 \high,\low,\enter_timer - ADD64 \high,\low,__LC_USER_TIMER - stm \high,\low,__LC_USER_TIMER - lm \high,\low,__LC_LAST_UPDATE_TIMER - SUB64 \high,\low,__LC_EXIT_TIMER - ADD64 \high,\low,__LC_SYSTEM_TIMER - stm \high,\low,__LC_SYSTEM_TIMER - mvc __LC_LAST_UPDATE_TIMER(8),\enter_timer - .endm - - .macro REENABLE_IRQS - st %r8,__LC_RETURN_PSW - ni __LC_RETURN_PSW,0xbf - ssm __LC_RETURN_PSW - .endm - - .section .kprobes.text, "ax" - -/* - * Scheduler resume function, called by switch_to - * gpr2 = (task_struct *) prev - * gpr3 = (task_struct *) next - * Returns: - * gpr2 = prev - */ -ENTRY(__switch_to) - l %r4,__THREAD_info(%r2) # get thread_info of prev - l %r5,__THREAD_info(%r3) # get thread_info of next - tm __TI_flags+3(%r4),_TIF_MCCK_PENDING # machine check pending? - jz 0f - ni __TI_flags+3(%r4),255-_TIF_MCCK_PENDING # clear flag in prev - oi __TI_flags+3(%r5),_TIF_MCCK_PENDING # set it in next -0: stm %r6,%r15,__SF_GPRS(%r15) # store gprs of prev task - st %r15,__THREAD_ksp(%r2) # store kernel stack of prev - l %r15,__THREAD_ksp(%r3) # load kernel stack of next - lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4 - lm %r6,%r15,__SF_GPRS(%r15) # load gprs of next task - st %r3,__LC_CURRENT # store task struct of next - mvc __LC_CURRENT_PID(4,%r0),__TASK_pid(%r3) # store pid of next - st %r5,__LC_THREAD_INFO # store thread info of next - ahi %r5,STACK_SIZE # end of kernel stack of next - st %r5,__LC_KERNEL_STACK # store end of kernel stack - br %r14 - -__critical_start: -/* - * SVC interrupt handler routine. System calls are synchronous events and - * are executed with interrupts enabled. - */ - -ENTRY(system_call) - stpt __LC_SYNC_ENTER_TIMER -sysc_stm: - stm %r8,%r15,__LC_SAVE_AREA_SYNC - l %r12,__LC_THREAD_INFO - l %r13,__LC_SVC_NEW_PSW+4 -sysc_per: - l %r15,__LC_KERNEL_STACK - ahi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) - la %r11,STACK_FRAME_OVERHEAD(%r15) # pointer to pt_regs -sysc_vtime: - UPDATE_VTIME %r8,%r9,__LC_SYNC_ENTER_TIMER - stm %r0,%r7,__PT_R0(%r11) - mvc __PT_R8(32,%r11),__LC_SAVE_AREA_SYNC - mvc __PT_PSW(8,%r11),__LC_SVC_OLD_PSW - mvc __PT_INT_CODE(4,%r11),__LC_SVC_ILC -sysc_do_svc: - oi __TI_flags+3(%r12),_TIF_SYSCALL - lh %r8,__PT_INT_CODE+2(%r11) - sla %r8,2 # shift and test for svc0 - jnz sysc_nr_ok - # svc 0: system call number in %r1 - cl %r1,BASED(.Lnr_syscalls) - jnl sysc_nr_ok - sth %r1,__PT_INT_CODE+2(%r11) - lr %r8,%r1 - sla %r8,2 -sysc_nr_ok: - l %r10,BASED(.Lsys_call_table) # 31 bit system call table - xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) - st %r2,__PT_ORIG_GPR2(%r11) - st %r7,STACK_FRAME_OVERHEAD(%r15) - l %r9,0(%r8,%r10) # get system call addr. - tm __TI_flags+2(%r12),_TIF_TRACE >> 8 - jnz sysc_tracesys - basr %r14,%r9 # call sys_xxxx - st %r2,__PT_R2(%r11) # store return value - -sysc_return: - LOCKDEP_SYS_EXIT -sysc_tif: - tm __PT_PSW+1(%r11),0x01 # returning to user ? - jno sysc_restore - tm __TI_flags+3(%r12),_TIF_WORK_SVC - jnz sysc_work # check for work - ni __TI_flags+3(%r12),255-_TIF_SYSCALL -sysc_restore: - mvc __LC_RETURN_PSW(8),__PT_PSW(%r11) - stpt __LC_EXIT_TIMER - lm %r0,%r15,__PT_R0(%r11) - lpsw __LC_RETURN_PSW -sysc_done: - -# -# One of the work bits is on. Find out which one. -# -sysc_work: - tm __TI_flags+3(%r12),_TIF_MCCK_PENDING - jo sysc_mcck_pending - tm __TI_flags+3(%r12),_TIF_NEED_RESCHED - jo sysc_reschedule - tm __TI_flags+3(%r12),_TIF_SIGPENDING - jo sysc_sigpending - tm __TI_flags+3(%r12),_TIF_NOTIFY_RESUME - jo sysc_notify_resume - tm __TI_flags+3(%r12),_TIF_PER_TRAP - jo sysc_singlestep - j sysc_return # beware of critical section cleanup - -# -# _TIF_NEED_RESCHED is set, call schedule -# -sysc_reschedule: - l %r1,BASED(.Lschedule) - la %r14,BASED(sysc_return) - br %r1 # call schedule - -# -# _TIF_MCCK_PENDING is set, call handler -# -sysc_mcck_pending: - l %r1,BASED(.Lhandle_mcck) - la %r14,BASED(sysc_return) - br %r1 # TIF bit will be cleared by handler - -# -# _TIF_SIGPENDING is set, call do_signal -# -sysc_sigpending: - ni __TI_flags+3(%r12),255-_TIF_PER_TRAP # clear TIF_PER_TRAP - lr %r2,%r11 # pass pointer to pt_regs - l %r1,BASED(.Ldo_signal) - basr %r14,%r1 # call do_signal - tm __TI_flags+3(%r12),_TIF_SYSCALL - jno sysc_return - lm %r2,%r7,__PT_R2(%r11) # load svc arguments - xr %r8,%r8 # svc 0 returns -ENOSYS - clc __PT_INT_CODE+2(2,%r11),BASED(.Lnr_syscalls+2) - jnl sysc_nr_ok # invalid svc number -> do svc 0 - lh %r8,__PT_INT_CODE+2(%r11) # load new svc number - sla %r8,2 - j sysc_nr_ok # restart svc - -# -# _TIF_NOTIFY_RESUME is set, call do_notify_resume -# -sysc_notify_resume: - lr %r2,%r11 # pass pointer to pt_regs - l %r1,BASED(.Ldo_notify_resume) - la %r14,BASED(sysc_return) - br %r1 # call do_notify_resume - -# -# _TIF_PER_TRAP is set, call do_per_trap -# -sysc_singlestep: - ni __TI_flags+3(%r12),255-(_TIF_SYSCALL | _TIF_PER_TRAP) - lr %r2,%r11 # pass pointer to pt_regs - l %r1,BASED(.Ldo_per_trap) - la %r14,BASED(sysc_return) - br %r1 # call do_per_trap - -# -# call tracehook_report_syscall_entry/tracehook_report_syscall_exit before -# and after the system call -# -sysc_tracesys: - l %r1,BASED(.Ltrace_enter) - lr %r2,%r11 # pass pointer to pt_regs - la %r3,0 - xr %r0,%r0 - icm %r0,3,__PT_INT_CODE+2(%r11) - st %r0,__PT_R2(%r11) - basr %r14,%r1 # call do_syscall_trace_enter - cl %r2,BASED(.Lnr_syscalls) - jnl sysc_tracenogo - lr %r8,%r2 - sll %r8,2 - l %r9,0(%r8,%r10) -sysc_tracego: - lm %r3,%r7,__PT_R3(%r11) - st %r7,STACK_FRAME_OVERHEAD(%r15) - l %r2,__PT_ORIG_GPR2(%r11) - basr %r14,%r9 # call sys_xxx - st %r2,__PT_R2(%r11) # store return value -sysc_tracenogo: - tm __TI_flags+2(%r12),_TIF_TRACE >> 8 - jz sysc_return - l %r1,BASED(.Ltrace_exit) - lr %r2,%r11 # pass pointer to pt_regs - la %r14,BASED(sysc_return) - br %r1 # call do_syscall_trace_exit - -# -# a new process exits the kernel with ret_from_fork -# -ENTRY(ret_from_fork) - la %r11,STACK_FRAME_OVERHEAD(%r15) - l %r12,__LC_THREAD_INFO - l %r13,__LC_SVC_NEW_PSW+4 - tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ? - jo 0f - st %r15,__PT_R15(%r11) # store stack pointer for new kthread -0: l %r1,BASED(.Lschedule_tail) - basr %r14,%r1 # call schedule_tail - TRACE_IRQS_ON - ssm __LC_SVC_NEW_PSW # reenable interrupts - j sysc_tracenogo - -# -# kernel_execve function needs to deal with pt_regs that is not -# at the usual place -# -ENTRY(kernel_execve) - stm %r12,%r15,48(%r15) - lr %r14,%r15 - l %r13,__LC_SVC_NEW_PSW+4 - ahi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) - st %r14,__SF_BACKCHAIN(%r15) - la %r12,STACK_FRAME_OVERHEAD(%r15) - xc 0(__PT_SIZE,%r12),0(%r12) - l %r1,BASED(.Ldo_execve) - lr %r5,%r12 - basr %r14,%r1 # call do_execve - ltr %r2,%r2 - je 0f - ahi %r15,(STACK_FRAME_OVERHEAD + __PT_SIZE) - lm %r12,%r15,48(%r15) - br %r14 - # execve succeeded. -0: ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts - l %r15,__LC_KERNEL_STACK # load ksp - ahi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) - la %r11,STACK_FRAME_OVERHEAD(%r15) - mvc 0(__PT_SIZE,%r11),0(%r12) # copy pt_regs - l %r12,__LC_THREAD_INFO - xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) - ssm __LC_SVC_NEW_PSW # reenable interrupts - l %r1,BASED(.Lexecve_tail) - basr %r14,%r1 # call execve_tail - j sysc_return - -/* - * Program check handler routine - */ - -ENTRY(pgm_check_handler) - stpt __LC_SYNC_ENTER_TIMER - stm %r8,%r15,__LC_SAVE_AREA_SYNC - l %r12,__LC_THREAD_INFO - l %r13,__LC_SVC_NEW_PSW+4 - lm %r8,%r9,__LC_PGM_OLD_PSW - tmh %r8,0x0001 # test problem state bit - jnz 1f # -> fault in user space - tmh %r8,0x4000 # PER bit set in old PSW ? - jnz 0f # -> enabled, can't be a double fault - tm __LC_PGM_ILC+3,0x80 # check for per exception - jnz pgm_svcper # -> single stepped svc -0: CHECK_STACK STACK_SIZE,__LC_SAVE_AREA_SYNC - j 2f -1: UPDATE_VTIME %r14,%r15,__LC_SYNC_ENTER_TIMER - l %r15,__LC_KERNEL_STACK -2: ahi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) - la %r11,STACK_FRAME_OVERHEAD(%r15) - stm %r0,%r7,__PT_R0(%r11) - mvc __PT_R8(32,%r11),__LC_SAVE_AREA_SYNC - stm %r8,%r9,__PT_PSW(%r11) - mvc __PT_INT_CODE(4,%r11),__LC_PGM_ILC - mvc __PT_INT_PARM_LONG(4,%r11),__LC_TRANS_EXC_CODE - tm __LC_PGM_ILC+3,0x80 # check for per exception - jz 0f - l %r1,__TI_task(%r12) - tmh %r8,0x0001 # kernel per event ? - jz pgm_kprobe - oi __TI_flags+3(%r12),_TIF_PER_TRAP - mvc __THREAD_per_address(4,%r1),__LC_PER_ADDRESS - mvc __THREAD_per_cause(2,%r1),__LC_PER_CAUSE - mvc __THREAD_per_paid(1,%r1),__LC_PER_PAID -0: REENABLE_IRQS - xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) - l %r1,BASED(.Ljump_table) - la %r10,0x7f - n %r10,__PT_INT_CODE(%r11) - je sysc_return - sll %r10,2 - l %r1,0(%r10,%r1) # load address of handler routine - lr %r2,%r11 # pass pointer to pt_regs - basr %r14,%r1 # branch to interrupt-handler - j sysc_return - -# -# PER event in supervisor state, must be kprobes -# -pgm_kprobe: - REENABLE_IRQS - xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) - l %r1,BASED(.Ldo_per_trap) - lr %r2,%r11 # pass pointer to pt_regs - basr %r14,%r1 # call do_per_trap - j sysc_return - -# -# single stepped system call -# -pgm_svcper: - oi __TI_flags+3(%r12),_TIF_PER_TRAP - mvc __LC_RETURN_PSW(4),__LC_SVC_NEW_PSW - mvc __LC_RETURN_PSW+4(4),BASED(.Lsysc_per) - lpsw __LC_RETURN_PSW # branch to sysc_per and enable irqs - -/* - * IO interrupt handler routine - */ - -ENTRY(io_int_handler) - stck __LC_INT_CLOCK - stpt __LC_ASYNC_ENTER_TIMER - stm %r8,%r15,__LC_SAVE_AREA_ASYNC - l %r12,__LC_THREAD_INFO - l %r13,__LC_SVC_NEW_PSW+4 - lm %r8,%r9,__LC_IO_OLD_PSW - tmh %r8,0x0001 # interrupting from user ? - jz io_skip - UPDATE_VTIME %r14,%r15,__LC_ASYNC_ENTER_TIMER -io_skip: - SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT - stm %r0,%r7,__PT_R0(%r11) - mvc __PT_R8(32,%r11),__LC_SAVE_AREA_ASYNC - stm %r8,%r9,__PT_PSW(%r11) - TRACE_IRQS_OFF - xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) - l %r1,BASED(.Ldo_IRQ) - lr %r2,%r11 # pass pointer to pt_regs - basr %r14,%r1 # call do_IRQ -io_return: - LOCKDEP_SYS_EXIT - TRACE_IRQS_ON -io_tif: - tm __TI_flags+3(%r12),_TIF_WORK_INT - jnz io_work # there is work to do (signals etc.) -io_restore: - mvc __LC_RETURN_PSW(8),__PT_PSW(%r11) - stpt __LC_EXIT_TIMER - lm %r0,%r15,__PT_R0(%r11) - lpsw __LC_RETURN_PSW -io_done: - -# -# There is work todo, find out in which context we have been interrupted: -# 1) if we return to user space we can do all _TIF_WORK_INT work -# 2) if we return to kernel code and preemptive scheduling is enabled check -# the preemption counter and if it is zero call preempt_schedule_irq -# Before any work can be done, a switch to the kernel stack is required. -# -io_work: - tm __PT_PSW+1(%r11),0x01 # returning to user ? - jo io_work_user # yes -> do resched & signal -#ifdef CONFIG_PREEMPT - # check for preemptive scheduling - icm %r0,15,__TI_precount(%r12) - jnz io_restore # preemption disabled - tm __TI_flags+3(%r12),_TIF_NEED_RESCHED - jno io_restore - # switch to kernel stack - l %r1,__PT_R15(%r11) - ahi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE) - mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) - xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) - la %r11,STACK_FRAME_OVERHEAD(%r1) - lr %r15,%r1 - # TRACE_IRQS_ON already done at io_return, call - # TRACE_IRQS_OFF to keep things symmetrical - TRACE_IRQS_OFF - l %r1,BASED(.Lpreempt_irq) - basr %r14,%r1 # call preempt_schedule_irq - j io_return -#else - j io_restore -#endif - -# -# Need to do work before returning to userspace, switch to kernel stack -# -io_work_user: - l %r1,__LC_KERNEL_STACK - ahi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE) - mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) - xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) - la %r11,STACK_FRAME_OVERHEAD(%r1) - lr %r15,%r1 - -# -# One of the work bits is on. Find out which one. -# Checked are: _TIF_SIGPENDING, _TIF_NOTIFY_RESUME, _TIF_NEED_RESCHED -# and _TIF_MCCK_PENDING -# -io_work_tif: - tm __TI_flags+3(%r12),_TIF_MCCK_PENDING - jo io_mcck_pending - tm __TI_flags+3(%r12),_TIF_NEED_RESCHED - jo io_reschedule - tm __TI_flags+3(%r12),_TIF_SIGPENDING - jo io_sigpending - tm __TI_flags+3(%r12),_TIF_NOTIFY_RESUME - jo io_notify_resume - j io_return # beware of critical section cleanup - -# -# _TIF_MCCK_PENDING is set, call handler -# -io_mcck_pending: - # TRACE_IRQS_ON already done at io_return - l %r1,BASED(.Lhandle_mcck) - basr %r14,%r1 # TIF bit will be cleared by handler - TRACE_IRQS_OFF - j io_return - -# -# _TIF_NEED_RESCHED is set, call schedule -# -io_reschedule: - # TRACE_IRQS_ON already done at io_return - l %r1,BASED(.Lschedule) - ssm __LC_SVC_NEW_PSW # reenable interrupts - basr %r14,%r1 # call scheduler - ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts - TRACE_IRQS_OFF - j io_return - -# -# _TIF_SIGPENDING is set, call do_signal -# -io_sigpending: - # TRACE_IRQS_ON already done at io_return - l %r1,BASED(.Ldo_signal) - ssm __LC_SVC_NEW_PSW # reenable interrupts - lr %r2,%r11 # pass pointer to pt_regs - basr %r14,%r1 # call do_signal - ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts - TRACE_IRQS_OFF - j io_return - -# -# _TIF_SIGPENDING is set, call do_signal -# -io_notify_resume: - # TRACE_IRQS_ON already done at io_return - l %r1,BASED(.Ldo_notify_resume) - ssm __LC_SVC_NEW_PSW # reenable interrupts - lr %r2,%r11 # pass pointer to pt_regs - basr %r14,%r1 # call do_notify_resume - ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts - TRACE_IRQS_OFF - j io_return - -/* - * External interrupt handler routine - */ - -ENTRY(ext_int_handler) - stck __LC_INT_CLOCK - stpt __LC_ASYNC_ENTER_TIMER - stm %r8,%r15,__LC_SAVE_AREA_ASYNC - l %r12,__LC_THREAD_INFO - l %r13,__LC_SVC_NEW_PSW+4 - lm %r8,%r9,__LC_EXT_OLD_PSW - tmh %r8,0x0001 # interrupting from user ? - jz ext_skip - UPDATE_VTIME %r14,%r15,__LC_ASYNC_ENTER_TIMER -ext_skip: - SWITCH_ASYNC __LC_SAVE_AREA_ASYNC,__LC_ASYNC_STACK,STACK_SHIFT - stm %r0,%r7,__PT_R0(%r11) - mvc __PT_R8(32,%r11),__LC_SAVE_AREA_ASYNC - stm %r8,%r9,__PT_PSW(%r11) - TRACE_IRQS_OFF - lr %r2,%r11 # pass pointer to pt_regs - l %r3,__LC_EXT_CPU_ADDR # get cpu address + interruption code - l %r4,__LC_EXT_PARAMS # get external parameters - l %r1,BASED(.Ldo_extint) - basr %r14,%r1 # call do_extint - j io_return - -/* - * Load idle PSW. The second "half" of this function is in cleanup_idle. - */ -ENTRY(psw_idle) - st %r4,__SF_EMPTY(%r15) - basr %r1,0 - la %r1,psw_idle_lpsw+4-.(%r1) - st %r1,__SF_EMPTY+4(%r15) - oi __SF_EMPTY+4(%r15),0x80 - la %r1,.Lvtimer_max-psw_idle_lpsw-4(%r1) - stck __IDLE_ENTER(%r2) - ltr %r5,%r5 - stpt __VQ_IDLE_ENTER(%r3) - jz psw_idle_lpsw - spt 0(%r1) -psw_idle_lpsw: - lpsw __SF_EMPTY(%r15) - br %r14 -psw_idle_end: - -__critical_end: - -/* - * Machine check handler routines - */ - -ENTRY(mcck_int_handler) - stck __LC_MCCK_CLOCK - spt __LC_CPU_TIMER_SAVE_AREA # revalidate cpu timer - lm %r0,%r15,__LC_GPREGS_SAVE_AREA # revalidate gprs - l %r12,__LC_THREAD_INFO - l %r13,__LC_SVC_NEW_PSW+4 - lm %r8,%r9,__LC_MCK_OLD_PSW - tm __LC_MCCK_CODE,0x80 # system damage? - jo mcck_panic # yes -> rest of mcck code invalid - la %r14,__LC_CPU_TIMER_SAVE_AREA - mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) - tm __LC_MCCK_CODE+5,0x02 # stored cpu timer value valid? - jo 3f - la %r14,__LC_SYNC_ENTER_TIMER - clc 0(8,%r14),__LC_ASYNC_ENTER_TIMER - jl 0f - la %r14,__LC_ASYNC_ENTER_TIMER -0: clc 0(8,%r14),__LC_EXIT_TIMER - jl 1f - la %r14,__LC_EXIT_TIMER -1: clc 0(8,%r14),__LC_LAST_UPDATE_TIMER - jl 2f - la %r14,__LC_LAST_UPDATE_TIMER -2: spt 0(%r14) - mvc __LC_MCCK_ENTER_TIMER(8),0(%r14) -3: tm __LC_MCCK_CODE+2,0x09 # mwp + ia of old psw valid? - jno mcck_panic # no -> skip cleanup critical - tm %r8,0x0001 # interrupting from user ? - jz mcck_skip - UPDATE_VTIME %r14,%r15,__LC_MCCK_ENTER_TIMER -mcck_skip: - SWITCH_ASYNC __LC_GPREGS_SAVE_AREA+32,__LC_PANIC_STACK,PAGE_SHIFT - mvc __PT_R0(64,%r11),__LC_GPREGS_SAVE_AREA - stm %r8,%r9,__PT_PSW(%r11) - xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) - l %r1,BASED(.Ldo_machine_check) - lr %r2,%r11 # pass pointer to pt_regs - basr %r14,%r1 # call s390_do_machine_check - tm __PT_PSW+1(%r11),0x01 # returning to user ? - jno mcck_return - l %r1,__LC_KERNEL_STACK # switch to kernel stack - ahi %r1,-(STACK_FRAME_OVERHEAD + __PT_SIZE) - mvc STACK_FRAME_OVERHEAD(__PT_SIZE,%r1),0(%r11) - xc __SF_BACKCHAIN(4,%r1),__SF_BACKCHAIN(%r1) - la %r11,STACK_FRAME_OVERHEAD(%r15) - lr %r15,%r1 - ssm __LC_PGM_NEW_PSW # turn dat on, keep irqs off - tm __TI_flags+3(%r12),_TIF_MCCK_PENDING - jno mcck_return - TRACE_IRQS_OFF - l %r1,BASED(.Lhandle_mcck) - basr %r14,%r1 # call s390_handle_mcck - TRACE_IRQS_ON -mcck_return: - mvc __LC_RETURN_MCCK_PSW(8),__PT_PSW(%r11) # move return PSW - tm __LC_RETURN_MCCK_PSW+1,0x01 # returning to user ? - jno 0f - lm %r0,%r15,__PT_R0(%r11) - stpt __LC_EXIT_TIMER - lpsw __LC_RETURN_MCCK_PSW -0: lm %r0,%r15,__PT_R0(%r11) - lpsw __LC_RETURN_MCCK_PSW - -mcck_panic: - l %r14,__LC_PANIC_STACK - slr %r14,%r15 - sra %r14,PAGE_SHIFT - jz 0f - l %r15,__LC_PANIC_STACK -0: ahi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) - j mcck_skip - -# -# PSW restart interrupt handler -# -ENTRY(restart_int_handler) - st %r15,__LC_SAVE_AREA_RESTART - l %r15,__LC_RESTART_STACK - ahi %r15,-__PT_SIZE # create pt_regs on stack - xc 0(__PT_SIZE,%r15),0(%r15) - stm %r0,%r14,__PT_R0(%r15) - mvc __PT_R15(4,%r15),__LC_SAVE_AREA_RESTART - mvc __PT_PSW(8,%r15),__LC_RST_OLD_PSW # store restart old psw - ahi %r15,-STACK_FRAME_OVERHEAD # create stack frame on stack - xc 0(STACK_FRAME_OVERHEAD,%r15),0(%r15) - lm %r1,%r3,__LC_RESTART_FN # load fn, parm & source cpu - ltr %r3,%r3 # test source cpu address - jm 1f # negative -> skip source stop -0: sigp %r4,%r3,1 # sigp sense to source cpu - brc 10,0b # wait for status stored -1: basr %r14,%r1 # call function - stap __SF_EMPTY(%r15) # store cpu address - lh %r3,__SF_EMPTY(%r15) -2: sigp %r4,%r3,5 # sigp stop to current cpu - brc 2,2b -3: j 3b - - .section .kprobes.text, "ax" - -#ifdef CONFIG_CHECK_STACK -/* - * The synchronous or the asynchronous stack overflowed. We are dead. - * No need to properly save the registers, we are going to panic anyway. - * Setup a pt_regs so that show_trace can provide a good call trace. - */ -stack_overflow: - l %r15,__LC_PANIC_STACK # change to panic stack - ahi %r15,-__PT_SIZE # create pt_regs - stm %r0,%r7,__PT_R0(%r15) - stm %r8,%r9,__PT_PSW(%r15) - mvc __PT_R8(32,%r11),0(%r14) - lr %r15,%r11 - ahi %r15,-STACK_FRAME_OVERHEAD - l %r1,BASED(1f) - xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) - lr %r2,%r11 # pass pointer to pt_regs - br %r1 # branch to kernel_stack_overflow -1: .long kernel_stack_overflow -#endif - -cleanup_table: - .long system_call + 0x80000000 - .long sysc_do_svc + 0x80000000 - .long sysc_tif + 0x80000000 - .long sysc_restore + 0x80000000 - .long sysc_done + 0x80000000 - .long io_tif + 0x80000000 - .long io_restore + 0x80000000 - .long io_done + 0x80000000 - .long psw_idle + 0x80000000 - .long psw_idle_end + 0x80000000 - -cleanup_critical: - cl %r9,BASED(cleanup_table) # system_call - jl 0f - cl %r9,BASED(cleanup_table+4) # sysc_do_svc - jl cleanup_system_call - cl %r9,BASED(cleanup_table+8) # sysc_tif - jl 0f - cl %r9,BASED(cleanup_table+12) # sysc_restore - jl cleanup_sysc_tif - cl %r9,BASED(cleanup_table+16) # sysc_done - jl cleanup_sysc_restore - cl %r9,BASED(cleanup_table+20) # io_tif - jl 0f - cl %r9,BASED(cleanup_table+24) # io_restore - jl cleanup_io_tif - cl %r9,BASED(cleanup_table+28) # io_done - jl cleanup_io_restore - cl %r9,BASED(cleanup_table+32) # psw_idle - jl 0f - cl %r9,BASED(cleanup_table+36) # psw_idle_end - jl cleanup_idle -0: br %r14 - -cleanup_system_call: - # check if stpt has been executed - cl %r9,BASED(cleanup_system_call_insn) - jh 0f - mvc __LC_SYNC_ENTER_TIMER(8),__LC_ASYNC_ENTER_TIMER - chi %r11,__LC_SAVE_AREA_ASYNC - je 0f - mvc __LC_SYNC_ENTER_TIMER(8),__LC_MCCK_ENTER_TIMER -0: # check if stm has been executed - cl %r9,BASED(cleanup_system_call_insn+4) - jh 0f - mvc __LC_SAVE_AREA_SYNC(32),0(%r11) -0: # set up saved registers r12, and r13 - st %r12,16(%r11) # r12 thread-info pointer - st %r13,20(%r11) # r13 literal-pool pointer - # check if the user time calculation has been done - cl %r9,BASED(cleanup_system_call_insn+8) - jh 0f - l %r10,__LC_EXIT_TIMER - l %r15,__LC_EXIT_TIMER+4 - SUB64 %r10,%r15,__LC_SYNC_ENTER_TIMER - ADD64 %r10,%r15,__LC_USER_TIMER - st %r10,__LC_USER_TIMER - st %r15,__LC_USER_TIMER+4 -0: # check if the system time calculation has been done - cl %r9,BASED(cleanup_system_call_insn+12) - jh 0f - l %r10,__LC_LAST_UPDATE_TIMER - l %r15,__LC_LAST_UPDATE_TIMER+4 - SUB64 %r10,%r15,__LC_EXIT_TIMER - ADD64 %r10,%r15,__LC_SYSTEM_TIMER - st %r10,__LC_SYSTEM_TIMER - st %r15,__LC_SYSTEM_TIMER+4 -0: # update accounting time stamp - mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER - # set up saved register 11 - l %r15,__LC_KERNEL_STACK - ahi %r15,-__PT_SIZE - st %r15,12(%r11) # r11 pt_regs pointer - # fill pt_regs - mvc __PT_R8(32,%r15),__LC_SAVE_AREA_SYNC - stm %r0,%r7,__PT_R0(%r15) - mvc __PT_PSW(8,%r15),__LC_SVC_OLD_PSW - mvc __PT_INT_CODE(4,%r15),__LC_SVC_ILC - # setup saved register 15 - ahi %r15,-STACK_FRAME_OVERHEAD - st %r15,28(%r11) # r15 stack pointer - # set new psw address and exit - l %r9,BASED(cleanup_table+4) # sysc_do_svc + 0x80000000 - br %r14 -cleanup_system_call_insn: - .long system_call + 0x80000000 - .long sysc_stm + 0x80000000 - .long sysc_vtime + 0x80000000 + 36 - .long sysc_vtime + 0x80000000 + 76 - -cleanup_sysc_tif: - l %r9,BASED(cleanup_table+8) # sysc_tif + 0x80000000 - br %r14 - -cleanup_sysc_restore: - cl %r9,BASED(cleanup_sysc_restore_insn) - jhe 0f - l %r9,12(%r11) # get saved pointer to pt_regs - mvc __LC_RETURN_PSW(8),__PT_PSW(%r9) - mvc 0(32,%r11),__PT_R8(%r9) - lm %r0,%r7,__PT_R0(%r9) -0: lm %r8,%r9,__LC_RETURN_PSW - br %r14 -cleanup_sysc_restore_insn: - .long sysc_done - 4 + 0x80000000 - -cleanup_io_tif: - l %r9,BASED(cleanup_table+20) # io_tif + 0x80000000 - br %r14 - -cleanup_io_restore: - cl %r9,BASED(cleanup_io_restore_insn) - jhe 0f - l %r9,12(%r11) # get saved r11 pointer to pt_regs - mvc __LC_RETURN_PSW(8),__PT_PSW(%r9) - mvc 0(32,%r11),__PT_R8(%r9) - lm %r0,%r7,__PT_R0(%r9) -0: lm %r8,%r9,__LC_RETURN_PSW - br %r14 -cleanup_io_restore_insn: - .long io_done - 4 + 0x80000000 - -cleanup_idle: - # copy interrupt clock & cpu timer - mvc __IDLE_EXIT(8,%r2),__LC_INT_CLOCK - mvc __VQ_IDLE_EXIT(8,%r3),__LC_ASYNC_ENTER_TIMER - chi %r11,__LC_SAVE_AREA_ASYNC - je 0f - mvc __IDLE_EXIT(8,%r2),__LC_MCCK_CLOCK - mvc __VQ_IDLE_EXIT(8,%r3),__LC_MCCK_ENTER_TIMER -0: # check if stck has been executed - cl %r9,BASED(cleanup_idle_insn) - jhe 1f - mvc __IDLE_ENTER(8,%r2),__IDLE_EXIT(%r2) - mvc __VQ_IDLE_ENTER(8,%r3),__VQ_IDLE_EXIT(%r3) - j 2f -1: # check if the cpu timer has been reprogrammed - ltr %r5,%r5 - jz 2f - spt __VQ_IDLE_ENTER(%r3) -2: # account system time going idle - lm %r9,%r10,__LC_STEAL_TIMER - ADD64 %r9,%r10,__IDLE_ENTER(%r2) - SUB64 %r9,%r10,__LC_LAST_UPDATE_CLOCK - stm %r9,%r10,__LC_STEAL_TIMER - mvc __LC_LAST_UPDATE_CLOCK(8),__IDLE_EXIT(%r2) - lm %r9,%r10,__LC_SYSTEM_TIMER - ADD64 %r9,%r10,__LC_LAST_UPDATE_TIMER - SUB64 %r9,%r10,__VQ_IDLE_ENTER(%r3) - stm %r9,%r10,__LC_SYSTEM_TIMER - mvc __LC_LAST_UPDATE_TIMER(8),__VQ_IDLE_EXIT(%r3) - # prepare return psw - n %r8,BASED(cleanup_idle_wait) # clear wait state bit - l %r9,24(%r11) # return from psw_idle - br %r14 -cleanup_idle_insn: - .long psw_idle_lpsw + 0x80000000 -cleanup_idle_wait: - .long 0xfffdffff - -/* - * Integer constants - */ - .align 4 -.Lnr_syscalls: - .long NR_syscalls -.Lvtimer_max: - .quad 0x7fffffffffffffff - -/* - * Symbol constants - */ -.Ldo_machine_check: .long s390_do_machine_check -.Lhandle_mcck: .long s390_handle_mcck -.Ldo_IRQ: .long do_IRQ -.Ldo_extint: .long do_extint -.Ldo_signal: .long do_signal -.Ldo_notify_resume: .long do_notify_resume -.Ldo_per_trap: .long do_per_trap -.Ldo_execve: .long do_execve -.Lexecve_tail: .long execve_tail -.Ljump_table: .long pgm_check_table -.Lschedule: .long schedule -#ifdef CONFIG_PREEMPT -.Lpreempt_irq: .long preempt_schedule_irq -#endif -.Ltrace_enter: .long do_syscall_trace_enter -.Ltrace_exit: .long do_syscall_trace_exit -.Lschedule_tail: .long schedule_tail -.Lsys_call_table: .long sys_call_table -.Lsysc_per: .long sysc_per + 0x80000000 -#ifdef CONFIG_TRACE_IRQFLAGS -.Lhardirqs_on: .long trace_hardirqs_on_caller -.Lhardirqs_off: .long trace_hardirqs_off_caller -#endif -#ifdef CONFIG_LOCKDEP -.Llockdep_sys_exit: .long lockdep_sys_exit -#endif -.Lcritical_start: .long __critical_start + 0x80000000 -.Lcritical_length: .long __critical_end - __critical_start - - .section .rodata, "a" -#define SYSCALL(esa,esame,emu) .long esa - .globl sys_call_table -sys_call_table: -#include "syscalls.S" -#undef SYSCALL |