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* Merge branch '4.0-fixes' into mips-for-linux-nextRalf Baechle2015-04-13
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| * MIPS: unaligned: Fix regular load/store instruction emulation for EVAMarkos Chandras2015-04-10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When emulating a regular lh/lw/lhu/sh/sw we need to use the appropriate instruction if we are in EVA mode. This is necessary for userspace applications which trigger alignment exceptions. In such case, the userspace load/store instruction needs to be emulated with the correct eva/non-eva instruction by the kernel emulator. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com> Fixes: c1771216ab48 ("MIPS: kernel: unaligned: Handle unaligned accesses for EVA") Cc: <stable@vger.kernel.org> # v3.15+ Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/9503/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
| * MIPS: unaligned: Surround load/store macros in do {} while statementsMarkos Chandras2015-04-10
| | | | | | | | | | | | | | | | | | | | | | | | It's best to surround such complex macros with do {} while statements so they can appear as independent logical blocks when used within other control blocks. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com> Cc: <stable@vger.kernel.org> # v3.15+ Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/9502/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
| * MIPS: unaligned: Prevent EVA instructions on kernel unaligned accessesMarkos Chandras2015-04-10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Commit c1771216ab48 ("MIPS: kernel: unaligned: Handle unaligned accesses for EVA") allowed unaligned accesses to be emulated for EVA. However, when emulating regular load/store unaligned accesses, we need to use the appropriate "address space" instructions for that. Previously, an unaligned load/store instruction in kernel space would have used the corresponding EVA instructions to emulate it which led to segmentation faults because of the address translation that happens with EVA instructions. This is now fixed by using the EVA instruction only when emulating EVA unaligned accesses. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com> Fixes: c1771216ab48 ("MIPS: kernel: unaligned: Handle unaligned accesses for EVA") Cc: <stable@vger.kernel.org> # v3.15+ Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/9501/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* | MIPS: Fix double inclusion of headers in misalignment emulator.Ralf Baechle2015-04-07
| | | | | | | | | | | | | | Introduced in 34c2f668d0f6b2ca1c076d8170d6cd4f2235a9d4 (MIPS: microMIPS: Add unaligned access support.) Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* | MIPS: Set `si_code' for SIGFPE signals sent from emulation tooMaciej W. Rozycki2015-04-07
|/ | | | | | | | | | | | | | | | | Rework `process_fpemu_return' and move IEEE 754 exception interpretation there, from `do_fpe'. Record the cause bits set in FCSR before they are cleared and pass them through to `process_fpemu_return' so as to set `si_code' correctly too for SIGFPE signals sent from emulation rather than those issued by hardware with the FPE processor exception only. For simplicity `mipsr2_decoder' assumes `*fcr31' has been preinitialised and only sets it to anything if an FPU instruction has been emulated, which in turn is the only case SIGFPE can be issued for here. Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/9705/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: kernel: unaligned: Add support for the MIPS R6Leonid Yegoshin2015-02-17
| | | | | | | | | | | The load/store unaligned instructions have been removed in MIPS R6 so we need to re-implement the related macros using the regular load/store instructions. Moreover, the load/store from coprocessor 2 instructions have been reallocated in Release 6 so we will handle them in the emulator instead. Signed-off-by: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
* MIPS: Remove BUG_ON(!is_fpu_owner()) in do_ade()Huacai Chen2014-07-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In do_ade(), is_fpu_owner() isn't preempt-safe. For example, when an unaligned ldc1 is executed, do_cpu() is called and then FPU will be enabled (and TIF_USEDFPU will be set for the current process). Then, do_ade() is called because the access is unaligned. If the current process is preempted at this time, TIF_USEDFPU will be cleard. So when the process is scheduled again, BUG_ON(!is_fpu_owner()) is triggered. This small program can trigger this BUG in a preemptible kernel: int main (int argc, char *argv[]) { double u64[2]; while (1) { asm volatile ( ".set push \n\t" ".set noreorder \n\t" "ldc1 $f3, 4(%0) \n\t" ".set pop \n\t" ::"r"(u64): ); } return 0; } V2: Remove the BUG_ON() unconditionally due to Paul's suggestion. Signed-off-by: Huacai Chen <chenhc@lemote.com> Signed-off-by: Jie Chen <chenj@lemote.com> Signed-off-by: Rui Wang <wangr@lemote.com> Cc: <stable@vger.kernel.org> Cc: John Crispin <john@phrozen.org> Cc: Steven J. Hill <Steven.Hill@imgtec.com> Cc: linux-mips@linux-mips.org Cc: Fuxin Zhang <zhangfx@lemote.com> Cc: Zhangjin Wu <wuzhangjin@gmail.com> Cc: stable@vger.kernel.org Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: kernel: unaligned: Handle unaligned accesses for EVALeonid Yegoshin2014-03-26
| | | | | | | | Handle unaligned accesses when we access userspace memory EVA mode. Signed-off-by: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
* MIPS: kernel: unaligned: Add EVA instruction wrappersMarkos Chandras2014-03-26
| | | | | | | Use the load/store instruction wrappers from asm/asm.h to perform such operations when operating in EVA mode. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
* MIPS: Declare emulate_load_store_microMIPS as a static function.David Daney2013-07-01
| | | | | | | | | | | It is only used from within a single file, it should not be globally visible. Signed-off-by: David Daney <david.daney@cavium.com> Acked-by: Steven J. Hill <Steven.Hill@imgtec.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/5325/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: Cleanup indentation and whitespaceTony Wu2013-07-01
| | | | | | | Signed-off-by: Tony Wu <tung7970@gmail.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/5536/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: Implement HAVE_CONTEXT_TRACKING.Ralf Baechle2013-06-10
| | | | | | This enables support for CONFIG_NO_HZ_FULL. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: MIPS16e: Add unaligned access support.Steven J. Hill2013-05-09
| | | | | | | Add logic needed to handle unaligned accesses in MIPS16e mode. Signed-off-by: Steven J. Hill <Steven.Hill@imgtec.com> Signed-off-by: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
* MIPS: microMIPS: Add unaligned access support.Leonid Yegoshin2013-05-09
| | | | | | | Add logic needed to handle unaligned accesses in microMIPS mode. Signed-off-by: Steven J. Hill <Steven.Hill@imgtec.com> Signed-off-by: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
* MIPS: microMIPS: Floating point support.Leonid Yegoshin2013-05-09
| | | | | | | Add logic needed to do floating point emulation in microMIPS mode. Signed-off-by: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> Signed-off-by: Steven J. Hill <Steven. Hill@imgtec.com>
* MIPS: Whitespace cleanup.Ralf Baechle2013-02-01
| | | | | | | | Having received another series of whitespace patches I decided to do this once and for all rather than dealing with this kind of patches trickling in forever. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* Disintegrate asm/system.h for MIPSDavid Howells2012-03-28
| | | | | | | | Disintegrate asm/system.h for MIPS. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Ralf Baechle <ralf@linux-mips.org> cc: linux-mips@linux-mips.org
* mips: remove needless include of module.h from core kernel files.Paul Gortmaker2011-10-31
| | | | | | | | None of these files are using modular infrastructure, and build tests reveal that none of these files are really relying on any implicit inclusions via. module.h either. So delete them. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
* perf: Remove the nmi parameter from the swevent and overflow interfacePeter Zijlstra2011-07-01
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The nmi parameter indicated if we could do wakeups from the current context, if not, we would set some state and self-IPI and let the resulting interrupt do the wakeup. For the various event classes: - hardware: nmi=0; PMI is in fact an NMI or we run irq_work_run from the PMI-tail (ARM etc.) - tracepoint: nmi=0; since tracepoint could be from NMI context. - software: nmi=[0,1]; some, like the schedule thing cannot perform wakeups, and hence need 0. As one can see, there is very little nmi=1 usage, and the down-side of not using it is that on some platforms some software events can have a jiffy delay in wakeup (when arch_irq_work_raise isn't implemented). The up-side however is that we can remove the nmi parameter and save a bunch of conditionals in fast paths. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Michael Cree <mcree@orcon.net.nz> Cc: Will Deacon <will.deacon@arm.com> Cc: Deng-Cheng Zhu <dengcheng.zhu@gmail.com> Cc: Anton Blanchard <anton@samba.org> Cc: Eric B Munson <emunson@mgebm.net> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: David S. Miller <davem@davemloft.net> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jason Wessel <jason.wessel@windriver.com> Cc: Don Zickus <dzickus@redhat.com> Link: http://lkml.kernel.org/n/tip-agjev8eu666tvknpb3iaj0fg@git.kernel.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
* MIPS: add support for software performance eventsDeng-Cheng Zhu2010-10-29
| | | | | | | | | | | | | | | | | | | | | | | Software events are required as part of the measurable stuff by the Linux performance counter subsystem. Here is the list of events added by this patch: PERF_COUNT_SW_PAGE_FAULTS PERF_COUNT_SW_PAGE_FAULTS_MIN PERF_COUNT_SW_PAGE_FAULTS_MAJ PERF_COUNT_SW_ALIGNMENT_FAULTS PERF_COUNT_SW_EMULATION_FAULTS Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@gmail.com> To: linux-mips@linux-mips.org Cc: a.p.zijlstra@chello.nl Cc: paulus@samba.org Cc: mingo@elte.hu Cc: acme@redhat.com Cc: jamie.iles@picochip.com Acked-by: David Daney <ddaney@caviumnetworks.com> Reviewed-by: Matt Fleming <matt@console-pimps.org> Patchwork: https://patchwork.linux-mips.org/patch/1686/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: Sanitize restart logicsAl Viro2010-10-18
| | | | | | | | | | | | | | | Put the original syscall number into ->regs[0] when we leave syscall with error. Use it in restart logics. Everything else will have it 0 since we pass through SAVE_SOME on all the ways in. Note that in places like bad_stack and inllegal_syscall we leave it 0 - it's not restartable. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Cc: linux-kernel@vger.kernel.org Cc: linux-arch@vger.kernel.org Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/1698/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: Modularize COP2 handlingRalf Baechle2009-12-16
| | | | | | | Away with the daemons of ifdef; get ready for future COP2 users. Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Patchwork: http://patchwork.linux-mips.org/patch/708/
* MIPS: Use force_sig when handling address errors.David Daney2009-05-14
| | | | | | | | | | | | | | When init is started it is SIGNAL_UNKILLABLE. If it were to get an address error, we would try to send it SIGBUS, but it would be ignored and the faulting instruction restarted. This results in an endless loop. We need to use force_sig() instead so it will actually die and give us some useful information. Reported-by: Florian Fainelli <florian@openwrt.org> Signed-off-by: David Daney <ddaney@caviumnetworks.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* MIPS: Switch FPU emulator trap to BREAK instruction.Ralf Baechle2008-10-30
| | | | | | | | | | | | Arguably using the address error handler has always been ugly. But with processors that handle unaligned loads and stores in hardware the current mechanism ceases to work so switch it to a BREAK instruction and allocate break code 514 to the FPU emulator. Yoichi Yuasa provided a build fix for CONFIG_BUG=n. Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
* MIPS: Fix debugfs_create_*'s error checking method for mips/kernel/Zhaolei2008-10-27
| | | | | | | | | debugfs_create_*() returns NULL on error. Make its callers return -ENODEV on error. Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com> Acked-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* [MIPS] Fix "no space between function name and open parenthesis" warnings.Ralf Baechle2007-10-11
| | | | Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* [MIPS] Fix build warning in unaligned load/store emulator.Ralf Baechle2007-07-31
| | | | Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* [MIPS] Fixup secure computing stuff.Ralf Baechle2007-07-31
| | | | Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* [MIPS] Add some debugfs files to debug unaligned accessesAtsushi Nemoto2007-07-10
| | | | | | | | | | | | | | | Currently a number of unaligned instructions is counted but not used. Add /debug/mips/unaligned_instructions file to show the value. And add /debug/mips/unaligned_action to control behavior upon an unaligned access. Possible actions are: 0: silently fixup the unaligned access. 1: send SIGBUS. 2: dump registers, process name, etc. and fixup. Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* Detach sched.h from mm.hAlexey Dobriyan2007-05-21
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | First thing mm.h does is including sched.h solely for can_do_mlock() inline function which has "current" dereference inside. By dealing with can_do_mlock() mm.h can be detached from sched.h which is good. See below, why. This patch a) removes unconditional inclusion of sched.h from mm.h b) makes can_do_mlock() normal function in mm/mlock.c c) exports can_do_mlock() to not break compilation d) adds sched.h inclusions back to files that were getting it indirectly. e) adds less bloated headers to some files (asm/signal.h, jiffies.h) that were getting them indirectly Net result is: a) mm.h users would get less code to open, read, preprocess, parse, ... if they don't need sched.h b) sched.h stops being dependency for significant number of files: on x86_64 allmodconfig touching sched.h results in recompile of 4083 files, after patch it's only 3744 (-8.3%). Cross-compile tested on all arm defconfigs, all mips defconfigs, all powerpc defconfigs, alpha alpha-up arm i386 i386-up i386-defconfig i386-allnoconfig ia64 ia64-up m68k mips parisc parisc-up powerpc powerpc-up s390 s390-up sparc sparc-up sparc64 sparc64-up um-x86_64 x86_64 x86_64-up x86_64-defconfig x86_64-allnoconfig as well as my two usual configs. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* header cleaning: don't include smp_lock.h when not usedRandy Dunlap2007-05-08
| | | | | | | | | | | | Remove includes of <linux/smp_lock.h> where it is not used/needed. Suggested by Al Viro. Builds cleanly on x86_64, i386, alpha, ia64, powerpc, sparc, sparc64, and arm (all 59 defconfigs). Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [MIPS] Always fixup unaligned accesses in kernel mode.Ralf Baechle2007-02-26
| | | | Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* Remove obsolete #include <linux/config.h>Jörn Engel2006-06-30
| | | | | Signed-off-by: Jörn Engel <joern@wohnheim.fh-wedel.de> Signed-off-by: Adrian Bunk <bunk@stusta.de>
* Sparseify MIPS.Ralf Baechle2005-10-29
| | | | Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* [PATCH] mips: clean up 32/64-bit configurationRalf Baechle2005-09-05
| | | | | | | | Start cleaning 32-bit vs. 64-bit configuration. Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* Linux-2.6.12-rc2v2.6.12-rc2Linus Torvalds2005-04-16
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!
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