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* microblaze: fix handling of multiple pending signalsAl Viro2013-02-031-2/+11
| | | | | | | | | | | | We need to keep building sigframes until no pending signals remain. Wrap do_notify_resume() calls into loops; do _not_ allow syscall restart logics to trigger after the first iteration. Incidentally, comments about pending signals that should (somehow) be in r18 are pure BS. Doesn't work that way and cannot work that way, sorry... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* microblaze: fix the horror with restarts of sigreturn()Al Viro2013-02-031-1/+4
| | | | | | | | | | | | | | | | | | | | | solution a-la arm one - pick a callee-saved register (r30), set it non-zero when entering a syscall, have sigreturn wrapper zero it out and pass the value in it to do_notify_resume() as "in_syscall" (actually, "restarts allowed") argument. Note that we don't give a damn about ret_from_fork() - return value is not restart-worthy anyway. Possible remaining bug: on !MMU we still have _debug_exception() restartable. If it hits with -ERESTART_... accidentally in r3, fun happens. MMU does _not_ have _debug_exception() restartable. If that's decided to be a bug (as I strongly suspect it to be), we'll just need to replace setting r30 to 1 with setting r30 to 0 in !MMU _debug_exception(). Up to microblaze maintainers... [folded a fix from Michal] Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* microblaze: evict the check for kernel_mode(regs) from do_notify_resume()Al Viro2013-02-031-0/+3
| | | | | | | | | Only one caller hasn't done it in assembler - work_pending on !MMU. Everything else can't reach do_notify_resume() if we are returning to kernel mode, so move that check to that sole caller and make do_notify_resume() reachable only when returning to userland. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* microblaze: Remove passing the second arg to schedule_tailMichal Simek2012-12-131-1/+0
| | | | Signed-off-by: Michal Simek <monstr@monstr.eu>
* microblaze: switch to generic fork/vfork/cloneAl Viro2012-11-281-8/+0
| | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
* microblaze: switch to generic sys_execve()Al Viro2012-11-161-4/+0
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* microblaze: switch to generic kernel_execve()Al Viro2012-11-161-2/+2
| | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
* microblaze: switch to generic kernel_thread()Al Viro2012-11-161-0/+8
| | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
* microblaze: drop 'oldset' argument of do_notify_resume()Al Viro2012-05-211-3/+1
| | | | | | never used... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* microblaze: handle TIF_NOTIFY_RESUMEAl Viro2012-05-211-6/+6
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* microblaze: bury sys_rt_sigsuspend_wrapper in nommu case tooAl Viro2012-05-211-4/+0
| | | | | | | | | | | | | | It's been a dead code since commit 571202f50fad0aeb36661c79de9beed052347df8 Author: Michal Simek <monstr@monstr.eu> Date: Fri Dec 11 12:54:04 2009 +0100 microblaze: Remove rt_sigsuspend wrapper Generic rt_sigsuspend syscalls doesn't need any asm wrapper. but that commit has only removed it from entry.S, missing one in entry-nommu.S. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* microblaze: Do not use "la" pseudo instruction - use addik insteadMichal Simek2011-03-091-2/+2
| | | | | | | "la" pseudo instruction is only translation to "addik". Use directly "addik" which is described in the MB reference guide. Signed-off-by: Michal Simek <monstr@monstr.eu>
* microblaze: Add stack unwinderSteven J. Magnani2010-08-041-0/+28
| | | | | | | | | | | | | | | | | | Implement intelligent backtracing by searching for stack frame creation, and emitting only return addresses. Use print_hex_dump() to display the entire binary kernel stack. Limitation: MMU kernels are not currently able to trace beyond a system trap (interrupt, syscall, etc.). It is the intent of this patch to provide infrastructure that can be extended to add this capability later. Changes from V1: * Removed checks in find_frame_creation() that prevented location of the frame creation instruction in heavily optimized code * Various formatting/commenting/file location tweaks per review comments * Dropped Kconfig option to enable STACKTRACE as something logically separate Signed-off-by: Steven J. Magnani <steve@digidescorp.com>
* microblaze: re-enable interrupts before calling scheduleSteven J. Magnani2010-05-131-0/+2
| | | | | | | schedule() should not be called with interrupts disabled. Signed-off-by: Steven J. Magnani <steve@digidescorp.com> Signed-off-by: Michal Simek <monstr@monstr.eu>
* microblaze: fix interrupt state restoreSteven J. Magnani2010-02-031-4/+6
| | | | | | | | | Interrupts must be disabled while an interrupt state restore (prep for interrupt return) is in progress. Code to do this was lost in the port to the mainline kernel. Signed-off-by: Steven J. Magnani <steve@digidescorp.com> Signed-off-by: Michal Simek <monstr@monstr.eu>
* microblaze: nommu: Don't clobber R11 on syscallssteve@digidescorp.com2009-12-141-2/+0
| | | | | | | | | | The noMMU syscall trap has a bug that causes R11 to be zero on return to userland. Remove the extra "save" of R11 responsible for the bug. Remove reloading of mode indicator because r11 already contains it. Signed-off-by: Steven J. Magnani <steve@digidescorp.com> Signed-off-by: Michal Simek <monstr@monstr.eu>
* microblaze: use generic syscalls.hArnd Bergmann2009-07-061-6/+6
| | | | | | | | | The prototypes in syscalls.h all make sense for microblaze, but for some of them, the actual implementation in sys_microblaze.c needs to be adapted. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Michal Simek <monstr@monstr.eu>
* microblaze: clean up signal handlingArnd Bergmann2009-07-061-8/+0
| | | | | | | | | | | | | | | When legacy signal handling is disabled, the arch/microblaze/kernel/signal.c implementation can be much simpler, as most of it is handled generically from kernel/signal.c. This is also a prerequisite for using the generic asm/unistd.h, which does not provide __NR_sigreturn, because this macro is referenced by the current signal.c implementation. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Michal Simek <monstr@monstr.eu>
* microblaze_mmu_v2: Enable fork syscall for MMU and add fork as vfork for noMMUMichal Simek2009-05-261-1/+1
| | | | Signed-off-by: Michal Simek <monstr@monstr.eu>
* microblaze_v8: assembler files head.S, entry-nommu.S, syscall_table.SMichal Simek2009-03-271-0/+596
Reviewed-by: Ingo Molnar <mingo@elte.hu> Acked-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com> Acked-by: John Linn <john.linn@xilinx.com> Acked-by: John Williams <john.williams@petalogix.com> Signed-off-by: Michal Simek <monstr@monstr.eu>
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