summaryrefslogtreecommitdiffstats
path: root/arch/s390/kernel/entry.S
Commit message (Collapse)AuthorAgeFilesLines
* [S390] ftrace: add system call tracer supportHeiko Carstens2009-06-121-1/+3
| | | | | | | System call tracer support for s390. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] secure computing arch backendHeiko Carstens2009-06-121-2/+3
| | | | | | | Enable secure computing on s390 as well. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] cpu hotplug and accounting valuesMartin Schwidefsky2009-04-141-0/+13
| | | | | | | Reset the cpu timer to the maximum value and correctly initialize the cpu accounting values in the lowcore when the cpu is started. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [PATCH] improve idle cputime accountingMartin Schwidefsky2008-12-311-2/+3
| | | | | | | | Distinguish the cputime of the idle process where idle is actually using cpu cycles from the cputime where idle is sleeping on an enabled wait psw. The former is accounted as system time, the later as idle time. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] Remove config options.Martin Schwidefsky2008-12-251-49/+7Star
| | | | | | | On s390 we always want to run with precise cputime accounting. Remove the config options VIRT_TIMER and VIRT_CPU_ACCOUNTING. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] audit: get s390 ret_from_fork in sync with other architecturesAl Viro2008-12-251-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | On s390 we have ret_from_fork jump not to the "do all work we normally do on return from syscall" as on x86, ppc, etc., but to the "do all such work except audit". Historical reasons - the codepath triggered when we have AUDIT process flag set is separated from the normall one and they converge at sysc_return, which is the common part of post-syscall work. And does not include calling audit_syscall_exit() - that's done in the end of sysc_tracesys path, just before that path jumps to sysc_return. IOW, the child returning from fork()/clone()/vfork() doesn't call audit_syscall_exit() at all, so no matter what we do with its audit context, we are not going to see the audit entry. The fix is simple: have ret_from_fork go to the point just past the call of sys_.... in the 'we have AUDIT flag set' path. There we have (64bit variant; for 31bit the situation is the same): sysc_tracenogo: tm __TI_flags+7(%r9),(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT) jz sysc_return la %r2,SP_PTREGS(%r15) # load pt_regs larl %r14,sysc_return # return point is sysc_return jg do_syscall_trace_exit which is precisely what we need - check the flag, bugger off to sysc_return if not set, otherwise call do_syscall_trace_exit() and bugger off to sysc_return. r9 has just been properly set by ret_from_fork itself, so we are fine. Tested on s390x, seems to work fine. WARNING: it's been about 16 years since my last contact with 3X0 assembler[1], so additional review would be very welcome. I don't think I've managed to screw it up, but... [1] that *was* in another country and besides, the box is dead... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] fix system call parameter functions.Martin Schwidefsky2008-11-271-10/+11
| | | | | | | | | | | | | | | | | | syscall_get_nr() currently returns a valid result only if the call chain of the traced process includes do_syscall_trace_enter(). But collect_syscall() can be called for any sleeping task, the result of syscall_get_nr() in general is completely bogus. To make syscall_get_nr() work for any sleeping task the traps field in pt_regs is replace with svcnr - the system call number the process is executing. If svcnr == 0 the process is not on a system call path. The syscall_get_arguments and syscall_set_arguments use regs->gprs[2] for the first system call parameter. This is incorrect since gprs[2] may have been overwritten with the system call number if the call chain includes do_syscall_trace_enter. Use regs->orig_gprs2 instead. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] ftrace: fix kernel stack backchain walkingHeiko Carstens2008-11-141-7/+11
| | | | | | | | | | | | | | | With CONFIG_IRQSOFF_TRACER the trace_hardirqs_off() function includes a call to __builtin_return_address(1). But we calltrace_hardirqs_off() from early entry code. There we have just a single stack frame. So this results in a kernel stack backchain walk that would walk beyond the kernel stack. Following the NULL terminated backchain this results in a lowcore read access. To fix this we simply call trace_hardirqs_off_caller() and pass the current instruction pointer. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] lockdep: fix compile bugHeiko Carstens2008-11-141-0/+2
| | | | | | | | arch/s390/kernel/built-in.o: In function `cleanup_io_leave_insn': mem_detect.c:(.text+0x10592): undefined reference to `lockdep_sys_exit' Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] ptrace changesMartin Schwidefsky2008-10-101-10/+40
| | | | | | | | | * System call parameter and result access functions * Add tracehook calls * Split syscall_trace into two functions do_syscall_trace_enter and do_syscall_trace_exit Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] s390: Optimize user and work TIF checkMartin Schwidefsky2008-05-071-15/+14Star
| | | | | | | | | | | | On return from syscall or interrupt, we have to check if we return to userspace (likely) and if there is work todo (less likely) to decide if we handle the work. We can optimize this check: we first check for the less likely work case and then check for userspace. This patch is also a preparation for an additional patch, that fixes a bug in KVM dealing with cpu bound guests. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* signals: s390: renumber TIF_RESTORE_SIGMASKRoland McGrath2008-04-301-7/+7
| | | | | | | | | | | | | | | | TIF_RESTORE_SIGMASK no longer needs to be in the _TIF_WORK_* masks. Those low bits are scarce, and are all used up now. Renumber TIF_RESTORE_SIGMASK to free one up. Signed-off-by: Roland McGrath <roland@redhat.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: "Luck, Tony" <tony.luck@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [S390] Fix couple of section mismatches.Heiko Carstens2008-02-051-5/+2Star
| | | | | | | | | Fix couple of section mismatches. And since we touch the code anyway change the IPL code to use C99 initializers. Cc: Michael Holzheu <holzheu@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] Fix compile error on 31bit without preemptionChristian Borntraeger2007-12-041-0/+2
| | | | | | | | | | | | | Commit b8e7a54cd06b0b0174029ef3a7f5a1415a2c28f2 introduced a compile error if CONFIG_PREEMPT is not set: arch/s390/kernel/built-in.o: In function `cleanup_io_leave_insn': /space/kvm/arch/s390/kernel/entry.S:(.text+0xbfce): undefined reference to `preempt_schedule_irq' This patch hides preempt_schedule_irq if CONFIG_PREEMPT is not set. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] Fix kernel preemption.Heiko Carstens2007-11-201-10/+5Star
| | | | | | | | | | When returning from IRQ handling and TIF_NEED_RESCHED is set we must call preempt_schedule_irq() instead of schedule(). Otherwise the BKL might be unlocked in schedule() and therfore everything that relies on the BKL is broken. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] Fix irq tracing and lockdep_sys_exit calls.Heiko Carstens2007-11-201-33/+76
| | | | | | | | | | | | | | Current support for TRACE_IRQFLAGS and lockdep_sys_exit is broken. IRQ flag tracing is broken for program checks. Even worse is that the newly introduced calls to lockdep_sys_exit are in the critical section code which is not supposed to call any C functions. In addition the checks if locks are still held are also done when returning to kernel code which is broken as well. Fix all this by disabling interrupts and machine checks at the exit paths and then do the appropriate checks and calls. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* lockdep: s390: connect the sysexit hookHeiko Carstens2007-10-111-0/+12
| | | | | | | | | Run the lockdep_sys_exit hook before returning to user space. Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* [S390] Fix IRQ tracing.Heiko Carstens2007-07-271-2/+4
| | | | | | | | | | | | | | | | If a machine check is pending and the external or I/O interrupt handler returns to userspace io_mcck_pending is going to call s390_handle_mcck. Before this happens a call to TRACE_IRQS_ON was already made since we know that we are going back to userspace and hence interrupts will be enabled. So there was an indication that interrupts are enabled while in reality they are still disabled. s390_handle_mcck will do a local_irq_save/restore pair and confuse lockdep which later complains about inconsistent irq tracing. To solve this just call trace_hardirqs_off before calling s390_handle_mcck and trace_hardirqs_on afterwards. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] system call optimization.Martin Schwidefsky2007-07-101-1/+6
| | | | | | | | | After the in-kernel system call has been remove the system call path can be optimized. The problem state bit of the old psw is always set between system_call and sysc_do_svc. SAVE_ALL_SVC uses this information to avoid two instructions. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] Fix yet another two section mismatches.Heiko Carstens2007-06-191-1/+7
| | | | | | | | | | | | WARNING: arch/s390/kernel/built-in.o(.text+0xb92a): Section mismatch: reference to .init.text:start_secondary (between 'restart_addr' and 'stack_overflow') WARNING: arch/s390/appldata/built-in.o(.data+0xdc): Section mismatch: reference to .init.text: (between 'appldata_nb' and 'appldata_timer_lock') Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] System call cleanup.Martin Schwidefsky2007-04-271-55/+32Star
| | | | | | | | | | | Remove system call glue for sys_clone, sys_fork, sys_vfork, sys_execve, sys_sigreturn, sys_rt_sigreturn and sys_sigaltstack. Call do_execve from kernel_execve directly, move pt_regs to the right place and branch to sysc_return to start the user space program. This removes the last in-kernel system call. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
* [S390] Whitespace cleanup.Heiko Carstens2006-09-281-235/+234Star
| | | | | | | Huge s390 assembly files whitespace cleanup. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] add kprobes support.Michael Grundy2006-09-201-0/+12
| | | | | | Signed-off-by: Michael Grundy <grundym@us.ibm.com> Signed-off-by: David Wilder <dwilder@us.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [PATCH] lockdep: irqtrace subsystem, s390 supportHeiko Carstens2006-07-041-1/+28
| | | | | | | | | | | irqtrace support for s390. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Arjan van de Ven <arjan@infradead.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] s390: put sys_call_table into .rodata section and write protect itHeiko Carstens2006-07-011-3/+6
| | | | | | | | | | | | Put s390's syscall tables into .rodata section and write protect this section to prevent misuse of it. Suggested by Arjan van de Ven <arjan@infradead.org>. Cc: Arjan van de Ven <arjan@infradead.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* Remove obsolete #include <linux/config.h>Jörn Engel2006-06-301-1/+0Star
| | | | | Signed-off-by: Jörn Engel <joern@wohnheim.fh-wedel.de> Signed-off-by: Adrian Bunk <bunk@stusta.de>
* [S390] remove export of sys_call_tableMartin Schwidefsky2006-06-291-1/+0Star
| | | | | | Remove export of the sys_call_table symbol to prevent the misuse of it. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [S390] virtual cpu accounting vs. machine checks.Martin Schwidefsky2006-06-291-20/+59
| | | | | | | | | | | | | | | | If a machine checks interrupts the external or the i/o interrupt handler before they have completed the cpu time calculations, the accounting goes wrong. After the cpu returned from the machine check handler to the interrupted interrupt handler, a negative cpu time delta can occur. If the accumulated cpu time in lowcore is small enough this value can get negative as well. The next jiffy interrupt will pick up that negative value, shift it by 12 and add the now huge positive value to the cpu time of the process. To solve this the machine check handler is modified not to change any of the timestamps in the lowcore if the machine check interrupted kernel context. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* [PATCH] s390: Add support for new syscalls/TIF_RESTORE_SIGMASKHeiko Carstens2006-02-011-38/+13Star
| | | | | | | | | Add support for the new *at, pselect6 and ppoll system calls. This includes adding required support for TIF_RESTORE_SIGMASK. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] s390: signal deliveryHeiko Carstens2005-11-071-2/+2
| | | | | | | | | | Always create all signal frames for pending signals before returning to userspace, not just a single one. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] s390: kernel stack corruptionPeter Oberparleiter2005-09-171-1/+1
| | | | | | | | | | | | When an asynchronous interruption occurs during the execution of the 'critical section' within the generic interruption handling code (entry.S), a faulty check for a userspace PSW may result in a corrupted kernel stack pointer which subsequently triggers a stack overflow check. Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* kbuild: m68k,parisc,ppc,ppc64,s390,xtensa use generic asm-offsets.h supportSam Ravnborg2005-09-091-1/+1
| | | | | | Delete obsoleted parts form arch makefiles and rename to asm-offsets.h Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
* [PATCH] s390: machine check handler bugsMartin Schwidefsky2005-09-051-28/+88
| | | | | | | | | | | | | | | | | | | | | | | | | The new machine check handler still has a few bugs. 1) The system entry time has to be stored in the machine check handler, 2) the machine check return psw may not be stored at the usual place because it might overwrite the return psw of the interrupted context, 3) the return address for the call to s390_handle_mcck in the i/o interrupt handler is not correct, 4) the system call cleanup has to take the different save area of the machine check handler into account, 5) the machine check handler may not call UPDATE_VTIME before CREATE_STACK_FRAME, and 6) the io leave path needs a critical section cleanup to make sure that the TIF_MCCK_PENDING bit is really checked before switching back to user space. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] s390: cpu timer reset in machine check handlerHeiko Carstens2005-07-281-3/+3
| | | | | | | | | Fix wrong move direction of timer values for cpu accounting in case of a machine check that indicates a broken cpu timer. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] s390: improved machine check handlingHeiko Carstens2005-06-261-9/+93
| | | | | | | | | | Improved machine check handling. Kernel is now able to receive machine checks while in kernel mode (system call, interrupt and program check handling). Also register validation is now performed. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* Linux-2.6.12-rc2Linus Torvalds2005-04-171-0/+868
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2024-07-19 18:42:06 +0200