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* um: fill the handlers array at build timeAl Viro2011-11-024-12/+21
| | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
* um: simplify set_handler()Al Viro2011-11-024-27/+19
| | | | | | | | | | For one thing, we always block the same signals (IRQ ones - IO, WINCH, VTALRM), so there's no need to pass sa_mask elements in arguments. For another, the flags depend only on whether it's an IRQ signal or not (we add SA_RESTART for them). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
* um: don't bother blocking SIGARLM and SIGUSR1Al Viro2011-11-023-9/+8
| | | | | | | | We used to generate those, but we hadn't done that for a long time. No need to bother blocking them for signal handlers. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
* um: switch stub_segv_handler to SA_SIGINFO variant, get rid of magic crap in ↵Al Viro2011-11-027-39/+14
| | | | | | | there Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
* um: kill includes of sysdep/sigcontext.h from stuff built with kernel headersAl Viro2011-11-028-22/+14
| | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
* um: merge arch/um/os-Linux/sys-{i386,x86_64}Al Viro2011-11-029-85/+57
| | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
* um: merge hard_handler() instances, switch to use of SA_SIGINFOAl Viro2011-11-025-35/+10
| | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
* um: kill dead code around uaccessAl Viro2011-11-026-77/+3
| | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
* um: merge arch/um/sys-{i386,x86_64}Al Viro2011-11-0251-193/+81
| | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
* um: merge arch/um/sys-{i386,x86_64}/sharedAl Viro2011-11-0239-134/+61
| | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
* um: merge arch/um/sys-{i386,x86_64}/asmAl Viro2011-11-0219-234/+192
| | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
* um: get rid of unused macros in ptrace_user.hAl Viro2011-11-022-63/+0
| | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
* um: get rid of sysdep/sc.hAl Viro2011-11-024-91/+15
| | | | | | | | | only sysdep/sigcontext.h uses it and very few definitions are actually used. The rest refers to symbols that don't even exist anymore anyway. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
* um: Get rid of UPT_SET/UPT_REG macrosAl Viro2011-11-025-158/+145
| | | | | | | | the only users are arch getreg()/putreg() and it's easier to handle it there instead of playing with macros from hell Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
* um: take vm-flags.h to sys-*/asmAl Viro2011-11-023-1/+1
| | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
* um: get rid of sysdep/checksum.hAl Viro2011-11-023-7/+1
| | | | | | | Move those to sys-.../asm/checksum.h, kill include/asm/checksum.h Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
* um: trim unused junk from user.hAl Viro2011-11-021-2/+0
| | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
* um: get rid of kern_constants.hAl Viro2011-11-025-14/+5
| | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
* um: kill a couple of useless includes of kern_constants.hAl Viro2011-11-022-2/+0
| | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
* um: -include user.h for USER_OBJ, trim includesAl Viro2011-11-0247-78/+3
| | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
* um: take user_constants.h to include/generatedAl Viro2011-11-027-9/+8
| | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
* um: kill skas_ptregs.hAl Viro2011-11-023-10/+0
| | | | | | | | It's a plain include of user_constants.h and all (2) users are including user_constants.h directly prior to that. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
* um: switch to -idirafter, get saner kern_constants.h out of thatAl Viro2011-11-021-2/+2
| | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
* um: series of __get_user() is costly in sigframe handlingAl Viro2011-11-022-86/+80
| | | | | | | | | | It's not x86, where __get_user() is a single dereference; here it's a single ptrace(2) call in host, which obviously costs a lot more. IOW, it's cheaper to do copy_{to,from}_user() once than bother with fields one by one... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
* um: make copy_sc() staticAl Viro2011-11-023-32/+1
| | | | | | | ... and kill it in amd64 - not used. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
* um: don't rely on sc.fpstate not having been reassigned prior to rt_sigreturn()Al Viro2011-11-021-5/+8
| | | | | | | native rt_sigreturn() doesn't... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
* um: switch {rt_,}sigreturn() to set_current_blocked()Al Viro2011-11-022-15/+3
| | | | | | | same story as on x86 native... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
* um: use subarch-obj instead of copying...Al Viro2011-11-022-227/+2
| | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
* um: fix strrchr() problemsAl Viro2011-09-141-1/+1
| | | | | | | | | | | | | | | | | | | richard@nod.at: Fixes: /usr/lib/gcc/x86_64-linux-gnu/4.4.5/../../../../lib/libc.a(strrchr.o): In function `rindex': (.text+0x0): multiple definition of `strrchr' If both STATIC_LINK and UML_NET_VDE are set to "y" libc's strrchr may clash with the kernel implementation. This workaround comes originally from Jeff Dike: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=494995#35 Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at> Cc: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* um: clean arch_ptrace() up a bitAl Viro2011-09-145-46/+31
| | | | | | | | | | 1) take subarch-specific stuff to subarch_ptrace() 2) PTRACE_{PEEK,POKE}{TEXT,DATA} is handled by ptrace_request() just fine... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* um: PTRACE_[GS]ETFPXREGS had been wired on the wrong subarchAl Viro2011-09-142-14/+14
| | | | | | | | | | It's 32bit-only, not 64bit-only... And while we are at it, it's set_fpxregs(), not set_fpregs()... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* um: fix free_winch() messAl Viro2011-09-141-14/+24
| | | | | | | | | | | | while not doing free_irq() from irq handler is commendable, kfree() on the data passed to said handler before free_irq() is Not Good(tm). Freeing the stack it's being run on is also not nice... Solution: delay actually freeing stuff. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* um: winch_interrupt() can happen inside of free_winch()Al Viro2011-09-141-2/+4
| | | | | | | | | | | ... so set winch->fd to -1 before doing free_irq(), to avoid having winch_interrupt() come from/during the latter and attempt to do reactivate_fd() on something that's already gone. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* um: fix oopsable race in line_close()Al Viro2011-09-142-13/+13
| | | | | | | | | | | | | | | tty->count is decremented only after ->close() had been called and several tasks can hit it in parallel. As the result, using tty->count to check if you are the last one is broken. We end up leaving line->tty not reset to NULL and the next IRQ on that sucker will blow up trying to dereference pointers from kfree'd struct tty. Fix is obvious: we need to use a counter of our own. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* um: Save FPU registers between task switchesIngo van Lil2011-09-147-5/+31
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Some time ago Jeff prepared 42daba316557 ("uml: stop saving process FP state") for UML to stop saving the process FP state between task switches. The assumption was that since with SKAS0 every guest process runs inside a host process context the host OS will take care of keeping the proper FP state. Unfortunately this is not true for multi-threaded applications, where all guest threads share a single host process context yet all may use the FPU on their own. Although I haven't verified it I suspect things to be even worse in SKAS3 mode where all guest processes run inside a single host process. The patch reintroduces the saving and restoring of the FP context between task switches. [richard@nod.at: Ingo posted this patch in 2009, sadly it was never applied and got lost. Now in 2011 the problem was reported by Gunnar.] Signed-off-by: Ingo van Lil <inguin@gmx.de> Signed-off-by: Richard Weinberger <richard@nod.at> Reported-by: <gunnarlindroth@hotmail.com> Tested-by: <gunnarlindroth@hotmail.com> Cc: Stanislav Meduna <stano@meduna.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* um: drivers/xterm.c: fix a file descriptor leakJonathan Neuschäfer2011-09-141-0/+1
| | | | | | | | | | | I could use out_close1, but that seems to be the code path to close the fd returned by os_create_unix_socket, and using it to close the fd returned by mkstemp might lead to some confusion, so I don't do it. Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* um: disable CMPXCHG_DOUBLE as it breaks UML buildThadeu Lima de Souza Cascardo2011-09-141-0/+4
| | | | | | | | | | | | | | | Commit b789ef518b2 ("slub: Add cmpxchg_double_slab()") tests for cmpxchg_double support in the SLUB code and it breaks UML builds with SLUB. Since UML does not support checking for CPU features, disable CMPXCHG_DOUBLE just like CMPXCHG_LOCAL is disabled for UML. Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com> Reviewed-by: Christoph Lameter <cl@linux.com> Cc: Jeff Dike <jdike@addtoit.com> Cc: Richard Weinberger <richard@nod.at> Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* ptrace: unify show_regs() prototypeMike Frysinger2011-07-261-2/+0
| | | | | | | | | [ poleg@redhat.com: no need to declare show_regs() in ptrace.h, sched.h does this ] Signed-off-by: Mike Frysinger <vapier@gentoo.org> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Merge 'akpm' patch seriesLinus Torvalds2011-07-2534-90/+604
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * Merge akpm patch series: (122 commits) drivers/connector/cn_proc.c: remove unused local Documentation/SubmitChecklist: add RCU debug config options reiserfs: use hweight_long() reiserfs: use proper little-endian bitops pnpacpi: register disabled resources drivers/rtc/rtc-tegra.c: properly initialize spinlock drivers/rtc/rtc-twl.c: check return value of twl_rtc_write_u8() in twl_rtc_set_time() drivers/rtc: add support for Qualcomm PMIC8xxx RTC drivers/rtc/rtc-s3c.c: support clock gating drivers/rtc/rtc-mpc5121.c: add support for RTC on MPC5200 init: skip calibration delay if previously done misc/eeprom: add eeprom access driver for digsy_mtc board misc/eeprom: add driver for microwire 93xx46 EEPROMs checkpatch.pl: update $logFunctions checkpatch: make utf-8 test --strict checkpatch.pl: add ability to ignore various messages checkpatch: add a "prefer __aligned" check checkpatch: validate signature styles and To: and Cc: lines checkpatch: add __rcu as a sparse modifier checkpatch: suggest using min_t or max_t ... Did this as a merge because of (trivial) conflicts in - Documentation/feature-removal-schedule.txt - arch/xtensa/include/asm/uaccess.h that were just easier to fix up in the merge than in the patch series.
| * um: remove dead codeRichard Weinberger2011-07-253-6/+3
| | | | | | | | | | | | | | | | GCC 4.6's -Wunused-but-set-variable found some dead code. Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| * um: adjust size of pid_bufRichard Weinberger2011-07-251-1/+1
| | | | | | | | | | | | | | | | | | | | Linux can have pids up to 4*1024*1024. To handle such huge numbers pid_buf needs to be larger. Reported-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| * um: implement a x86_64 vDSORichard Weinberger2011-07-259-0/+365
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Until now UML had no x86_64 vDSO. So glibc always used the vsyscall page for gettimeday() and friends. Calls to gettimeday() returned falsely the host time and confused some programs. This patch adds a vDSO which turns all __vdso_* calls into a system call so that UML can trap them. As glibc still uses the vsyscall page for static binaries this patch improves the situation only for dynamic binaries. Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| * um: set __HAVE_ARCH_GATE_AREA for x86_64Richard Weinberger2011-07-253-1/+37
| | | | | | | | | | | | | | | | | | | | | | Implement arch_vma_name() and make get_gate_vma(), in_gate_area() and in_gate_area_no_mm() a nop. We need arch_vma_name() to support vDSO. Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| * um: Set __HAVE_ARCH_GATE_AREA for i386Richard Weinberger2011-07-253-1/+65
| | | | | | | | | | | | | | | | | | | | When UML is unable to reuse the host's vDSO FIXADDR_USER_START is zero. To handle this special case correclty we have to implement custom gate area helper methods. Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| * um: disable scan_elf_aux() on x86_64Richard Weinberger2011-07-253-7/+8
| | | | | | | | | | | | | | | | Reusing the host's vDSO makes only sense on x86_32. Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| * uml: free resourcesDavidlohr Bueso2011-07-251-2/+4
| | | | | | | | | | | | | | | | | | | | | | When creating the temp file there's a memory and file descriptor leak upon error. Signed-off-by: Davidlohr Bueso <dave@gnu.org> Signed-off-by: Richard Weinberger <richard@nod.at> Reviewed-by: Vitaliy Ivanov <vitalivanov@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| * uml: drivers/slip_user.c memory leak fixVitaliy Ivanov2011-07-251-2/+1
| | | | | | | | | | | | | | | | | | Do not free memory when you failed to allocate it. Signed-off-by: Vitaliy Ivanov <vitalivanov@gmail.com> Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| * uml: helper.c warning correctionsVitaliy Ivanov2011-07-251-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | Fix this warning: arch/um/os-Linux/helper.c: In function `helper_child': arch/um/os-Linux/helper.c:38:7: warning: ignoring return value of `write', declared with attribute warn_unused_result [richard@nod.at: happens only with -D_FORTIFY_SOURCE=2] Signed-off-by: Vitaliy Ivanov <vitalivanov@gmail.com> Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| * uml: cow_user.c warning correctionsVitaliy Ivanov2011-07-251-1/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | Fix this warning: arch/um/drivers/cow_user.c: In function `absolutize': arch/um/drivers/cow_user.c:189:7: warning: ignoring return value of `chdir', declared with attribute warn_unused_result [richard@nod.at: happens only with -D_FORTIFY_SOURCE=2] Signed-off-by: Vitaliy Ivanov <vitalivanov@gmail.com> Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| * uml: drivers/net_user.c memory leak fixVitaliy Ivanov2011-07-251-1/+4
| | | | | | | | | | | | | | | | | | | | Perform memory cleanup on exit. On receiving invalid 'pid' we still should clean 'output' variable. Signed-off-by: Vitaliy Ivanov <vitalivanov@gmail.com> Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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