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| * xtensa: support hardware breakpoints/watchpointsMax Filippov2016-03-111-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Use perf framework to manage hardware instruction and data breakpoints. Add two new ptrace calls: PTRACE_GETHBPREGS and PTRACE_SETHBPREGS to query and set instruction and data breakpoints. Address bit 0 choose instruction (0) or data (1) break register, bits 31..1 are the register number. Both calls transfer two 32-bit words: address (0) and control (1). Instruction breakpoint contorl word is 0 to clear breakpoint, 1 to set. Data breakpoint control word bit 31 is 'trigger on store', bit 30 is 'trigger on load, bits 29..0 are length. Length 0 is used to clear a breakpoint. To set a breakpoint length must be a power of 2 in the range 1..64 and the address must be length-aligned. Introduce new thread_info flag: TIF_DB_DISABLED. Set it if debug exception is raised by the kernel code accessing watched userspace address and disable corresponding data breakpoint. On exit to userspace check that flag and, if set, restore all data breakpoints. Handle debug exceptions raised with PS.EXCM set. This may happen when window overflow/underflow handler or fast exception handler hits data breakpoint, in which case save and disable all data breakpoints, single-step faulting instruction and restore data breakpoints. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
| * xtensa: make fake NMI configurableMax Filippov2016-01-111-0/+16
| | | | | | | | | | | | | | | | | | | | Do not always use fake NMI when safe, provide Kconfig option instead. Print a warning if fake NMI is chosen in unsafe configuration, but allow it, because it may work if the user knows that interrupts with priorities at or above PMM IRQ are not used. Add a check to NMI handler that BUGs if any of these IRQs fire. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
* | PCI: Include pci/hotplug Kconfig directly from pci/KconfigBjorn Helgaas2016-03-081-2/+0Star
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Include pci/hotplug/Kconfig directly from pci/Kconfig, so arches don't have to source both pci/Kconfig and pci/hotplug/Kconfig. Note that this effectively adds pci/hotplug/Kconfig to the following arches, because they already sourced drivers/pci/Kconfig but they previously did not source drivers/pci/hotplug/Kconfig: alpha arm avr32 frv m68k microblaze mn10300 sparc unicore32 Inspired-by-patch-from: Bogicevic Sasa <brutallesale@gmail.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
* | dma-mapping: always provide the dma_map_ops based implementationChristoph Hellwig2016-01-211-1/+0Star
|/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Move the generic implementation to <linux/dma-mapping.h> now that all architectures support it and remove the HAVE_DMA_ATTR Kconfig symbol now that everyone supports them. [valentinrothberg@gmail.com: remove leftovers in Kconfig] Signed-off-by: Christoph Hellwig <hch@lst.de> Cc: "David S. Miller" <davem@davemloft.net> Cc: Aurelien Jacquiot <a-jacquiot@ti.com> Cc: Chris Metcalf <cmetcalf@ezchip.com> Cc: David Howells <dhowells@redhat.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Haavard Skinnemoen <hskinnemoen@gmail.com> Cc: Hans-Christian Egtvedt <egtvedt@samfundet.no> Cc: Helge Deller <deller@gmx.de> Cc: James Hogan <james.hogan@imgtec.com> Cc: Jesper Nilsson <jesper.nilsson@axis.com> Cc: Koichi Yasutake <yasutake.koichi@jp.panasonic.com> Cc: Ley Foon Tan <lftan@altera.com> Cc: Mark Salter <msalter@redhat.com> Cc: Mikael Starvik <starvik@axis.com> Cc: Steven Miao <realmz6@gmail.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Cc: Joerg Roedel <jroedel@suse.de> Cc: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Valentin Rothberg <valentinrothberg@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* xtensa: add FORCE_MAX_ZONEORDER to KconfigMax Filippov2015-11-031-0/+14
| | | | | | | Make maximal memory allocation order configurable, so that drivers could allocate huge buffers when they need to. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
* xtensa: nommu: select HAVE_FUTEX_CMPXCHGMax Filippov2015-11-021-0/+1
| | | | | | | | | | | Not having HAVE_FUTEX_CMPXCHG makes futex_detect_cmpxchg probe cmpxchg_futex_value_locked with NULL address. It's not guaranteed to fault without MMU, instead it locks up on Xtensa when there's no RAM at address 0. Select HAVE_FUTEX_CMPXCHG in noMMU Xtensa configurations. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
* xtensa: nommu: fix default memory start addressMax Filippov2015-11-021-1/+1
| | | | | | | RAM starts at 0x60000000 on noMMU cores, not at 0x40000000. Fix the default. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
* xtensa: implement counting and sampling perf eventsMax Filippov2015-08-171-0/+10
| | | | | | | | | | | | | | | | | | | | Xtensa Performance Monitor Module has up to 8 32 bit wide performance counters. Each counter may be enabled independently and can count any single type of hardware performance events. Event counting may be enabled and disabled globally (per PMM). Each counter has status register with bits indicating if the counter has been overflown and may be programmed to raise profiling IRQ on overflow. This IRQ is used to rewind counters and allow for counting more than 2^32 samples for counting events and to report samples for sampling events. For more details see Tensilica Debug User's Guide, chapter 8 "Performance monitor module". Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
* xtensa: select PERF_USE_VMALLOC for cache-aliasing configurationsMax Filippov2015-08-171-0/+1
| | | | Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
* xtensa: clean up Kconfig dependencies for custom coresMax Filippov2015-08-171-8/+3Star
| | | | Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
* xtensa: reimplement DMA API using common helpersMax Filippov2015-08-171-0/+2
| | | | | | | | | - keep existing functionality: don't handle attributes, don't support high memory; - implement scatterlist primitives (map/unmap/sync); - enable DMA API debug. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
* Merge branch 'for-linus' of ↵Linus Torvalds2015-06-231-1/+1
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial Pull trivial tree updates from Jiri Kosina: "As usual, mostly comment, kerneldoc and printk() fixes" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: lpfc: Grammar s/an negative/a negative/ ARM: lib/lib1funcs.S: fix typo s/substractions/subtractions/ cx25821: cx25821-medusa-reg.h: fix 0x0x prefix lib: crc-itu-t.[ch] fix 0x0x prefix in integer constants rapidio: Fix kerneldoc and comment qla4xxx: Fix printk() in qla4_83xx_read_reset_template() and qla4_83xx_pre_loopback_config() treewide: Kconfig: fix wording / spelling usb/serial: fix grammar in Kconfig help text for FTDI_SIO megaraid_sas: fix kerneldoc netfilter: ebtables: fix comment grammar drm/radeon: fix comment isdn: fix grammar in comment ARM: KVM: fix comment
| * treewide: Kconfig: fix wording / spellingMasanari Iida2015-05-261-1/+1
| | | | | | | | | | | | | | This patch fix spelling typos in Kconfig. Signed-off-by: Masanari Iida <standby24x7@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
* | xtensa: xtfpga: fix hardware lockup caused by LCD driverMax Filippov2015-02-271-0/+30
| | | | | | | | | | | | | | | | | | | | | | | | LCD driver is always built for the XTFPGA platform, but its base address is not configurable, and is wrong for ML605/KC705. Its initialization locks up KC705 board hardware. Make the whole driver optional, and its base address and bus width configurable. Implement 4-bit bus access method. Cc: stable@vger.kernel.org Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
* | Merge tag 'xtensa-for-next-20141213' of ↵Chris Zankel2014-12-161-0/+6
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | git://github.com/jcmvbkbc/linux-xtensa into for_next Xtensa improvements for 3.19: - fix permissions for kmapped pages so that copy_to_user_page works with them; - add power management menu to Kconfig to allow use of runtime PM.
| * | xtensa: add power management menu to KconfigMax Filippov2014-12-091-0/+6
| |/ | | | | | | | | | | This allows using runtime power management feature on Xtensa. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
* | xtensa: remove s6000 variant and s6105 platformDaniel Glöckner2014-10-211-13/+0Star
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The Stretch s6000 family support has been merged into mainline 5 years ago. There appear to be no users of this code since nobody complained that there is a merge error preventing compilation. Apart from the s6105 IP camera reference design there are no s6000 devices known to ever have run Linux and as the chips are out of production there probably never will be. The successor s7000 no longer uses an Xtensa core for the OS. Let's remove the code until someone is found who actually needs it. Signed-off-by: Daniel Glöckner <dg@emlix.com> Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
* | xtensa: make PLATFORM_DEFAULT_MEM parameters configurableMax Filippov2014-10-211-0/+36
| | | | | | | | | | | | This allows using xtfpga platform with both MMU and noMMU cores. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
* | xtensa: nommu: set up cache and atomctl in initialize_mmuMax Filippov2014-10-211-1/+0Star
|/ | | | | | | | | | | initialize_mmu sets up atomctl SR which is needed for s32c1i to function correctly even in noMMU configurations. It's also a good place to set up caching attributes of physical memory. Allow enabling INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX in noMMU configurations for setting up atomctl and cache attributes. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
* xtensa: xtfpga: only select ethoc when ethernet is availableMax Filippov2014-10-061-1/+1
| | | | | | | | Otherwise we get the following build warning: (XTENSA_PLATFORM_XTFPGA) selects ETHOC which has unmet direct dependencies (NETDEVICES && ETHERNET && HAS_IOMEM && HAS_DMA) Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
* xtensa: ISS: add BLOCK dependency to BLK_DEV_SIMDISKMax Filippov2014-10-061-1/+1
| | | | Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
* xtensa: deprecate fast_xtensa and fast_spill_registers syscallsMax Filippov2014-08-141-0/+26
| | | | | | | | | | These syscalls are not used by userspace tools for some time now, and they have issues when called with invalid arguments. It's not worth changing signal delivery mechanism as we don't expect any new users for these syscalls. Let's keep them for backwards compatibility under #ifdef, disabled by default. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
* xtensa: remove orphan MATH_EMULATION symbolMax Filippov2014-08-141-5/+0Star
| | | | Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
* xtensa: select HAVE_IDE only on platforms that may have itMax Filippov2014-08-141-1/+2
| | | | | | | HAVE_IDE is not a property of architecture but of a platform, and neither ISS or XTFPGA support it. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
* xtensa: sort 'select' statements in KconfigMax Filippov2014-08-141-11/+11
| | | | Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
* xtensa: make MMU-related configuration options depend on MMUMax Filippov2014-08-141-0/+2
| | | | | | | MMUv3 and HIGHMEM support are available only on configurations with MMU, don't show them otherwise. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
* xtensa: simplify addition of new core variantsMax Filippov2014-08-141-1/+35
| | | | | | | | | | Instead of adding new Kconfig options and Makefile rules for each new core variant provide XTENSA_VARIANT_CUSTOM variant and record variant name in the XTENSA_VARIANT_NAME variable. Adding new core variant now means providing directory structure under arch/xtensa/variant and specifying correct name in kernel configuration. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
* Merge tag 'xtensa-next-20140503' of git://github.com/czankel/xtensa-linuxLinus Torvalds2014-05-061-1/+19
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull Xtensa fixes from Chris Zankel: - Fixes allmodconfig, allnoconfig builds - Adds highmem support - Enables build-time exception table sorting. * tag 'xtensa-next-20140503' of git://github.com/czankel/xtensa-linux: xtensa: ISS: don't depend on CONFIG_TTY xtensa: xt2000: drop redundant sysmem initialization xtensa: add support for KC705 xtensa: xtfpga: introduce SoC I/O bus xtensa: add HIGHMEM support xtensa: optimize local_flush_tlb_kernel_range xtensa: dump sysmem from the bootmem_init xtensa: handle memmap kernel option xtensa: keep sysmem banks ordered in mem_reserve xtensa: keep sysmem banks ordered in add_sysmem_bank xtensa: split bootparam and kernel meminfo xtensa: enable sorting extable at build time xtensa: export __{invalidate,flush}_dcache_range xtensa: Export __invalidate_icache_range
| * xtensa: ISS: don't depend on CONFIG_TTYMax Filippov2014-05-051-1/+0Star
| | | | | | | | | | | | | | | | Build console support only when CONFIG_TTY is selected. This restores ISS as the default platform for allnoconfig builds. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
| * xtensa: add HIGHMEM supportMax Filippov2014-04-061-0/+18
| | | | | | | | | | | | | | | | | | Introduce fixmap area just below the vmalloc region. Use it for atomic mapping of high memory pages. High memory on cores with cache aliasing is not supported and is still to be implemented. Fail build for such configurations for now. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
| * xtensa: enable sorting extable at build timeMax Filippov2014-04-011-0/+1
| | | | | | | | | | Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Acked-by: David Daney <ddaney.cavm@gmail.com>
* | Kconfig: rename HAS_IOPORT to HAS_IOPORT_MAPUwe Kleine-König2014-04-081-2/+2
|/ | | | | | | | | | | | | | | | | | | | | | | If the renamed symbol is defined lib/iomap.c implements ioport_map and ioport_unmap and currently (nearly) all platforms define the port accessor functions outb/inb and friend unconditionally. So HAS_IOPORT_MAP is the better name for this. Consequently NO_IOPORT is renamed to NO_IOPORT_MAP. The motivation for this change is to reintroduce a symbol HAS_IOPORT that signals if outb/int et al are available. I will address that at least one merge window later though to keep surprises to a minimum and catch new introductions of (HAS|NO)_IOPORT. The changes in this commit were done using: $ git grep -l -E '(NO|HAS)_IOPORT' | xargs perl -p -i -e 's/\b((?:CONFIG_)?(?:NO|HAS)_IOPORT)\b/$1_MAP/' Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* xtensa: support common clock frameworkMax Filippov2014-02-211-0/+1
| | | | Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
* xtensa: no need to select USE_GENERIC_SMP_HELPERSPaul Bolle2014-02-211-1/+0Star
| | | | | | | | | Commit f615136c06a7 ("xtensa: add SMP support") added "select USE_GENERIC_SMP_HELPERS". But the Kconfig symbol USE_GENERIC_SMP_HELPERS was already removed in v3.13, so that select is a nop. Drop it. Signed-off-by: Paul Bolle <pebolle@tiscali.nl> Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
* xtensa: fsf: drop nonexistent GPIO32 supportMax Filippov2014-02-211-1/+0Star
| | | | | | | | | The toolchain for xtensa FSF core never supported GPIO32, drop it on the linux side too. Reported-by: Fengguang Wu <fengguang.wu@intel.com> Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Acked-by: Baruch Siach <baruch@tkos.co.il>
* Merge tag 'xtensa-next-20140123' of git://github.com/czankel/xtensa-linuxLinus Torvalds2014-01-251-5/+47
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull Xtensa patches from Chris Zankel: "The major changes are adding support for SMP for Xtensa, fixing and cleaning up the ISS (simulator) network driver, and better support for device trees" * tag 'xtensa-next-20140123' of git://github.com/czankel/xtensa-linux: (40 commits) xtensa: implement ndelay xtensa: clean up udelay xtensa: enable HAVE_PERF_EVENTS xtensa: remap io area defined in device tree xtensa: support default device tree buses xtensa: initialize device tree clock sources xtensa: xtfpga: fix definitions of platform devices xtensa: standardize devicetree cpu compatible strings xtensa: avoid duplicate of IO range definitions xtensa: fix ATOMCTL register documentation xtensa: Enable irqs after cpu is set online xtensa: ISS: raise network polling rate to 10 times/sec xtensa: remove unused XTENSA_ISS_NETWORK Kconfig parameter xtensa: ISS: avoid simple_strtoul usage xtensa: Switch to sched_clock_register() xtensa: implement CPU hotplug xtensa: add SMP support xtensa: add MX irqchip xtensa: clear timer IRQ unconditionally in its handler xtensa: clean up do_interrupt/do_IRQ ...
| * xtensa: enable HAVE_PERF_EVENTSBaruch Siach2014-01-141-0/+1
| | | | | | | | | | | | | | This allows the perf tool to monitor kernel tracepoint events. Signed-off-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
| * xtensa: remove unused XTENSA_ISS_NETWORK Kconfig parameterMichael Opdenacker2014-01-141-4/+0Star
| | | | | | | | | | | | | | | | | | This removes the XTENSA_ISS_NETWORK Kconfig parameter, which was no longer used anywhere in the source code and Makefiles. Signed-off-by: Michael Opdenacker <michael.opdenacker@free-electrons.com> Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
| * xtensa: implement CPU hotplugMax Filippov2014-01-141-0/+9
| | | | | | | | | | Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
| * xtensa: add SMP supportMax Filippov2014-01-141-1/+36
| | | | | | | | | | | | | | | | | | This is largely based on SMP code from the xtensa-2.6.29-smp tree by Piet Delaney, Marc Gauthier, Joe Taylor, Christian Zankel (and possibly other Tensilica folks). Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
| * xtensa: enable HAVE_IRQ_TIME_ACCOUNTINGMax Filippov2014-01-141-0/+1
| | | | | | | | | | Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
* | gpio: xtensa: depend on HAVE_XTENSA_GPIO32Baruch Siach2014-01-071-0/+6
|/ | | | | | | | Prevent build failure when the selected variant does not support GPIO32. Acked-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* Remove GENERIC_HARDIRQ config optionMartin Schwidefsky2013-09-131-1/+0Star
| | | | | | | | After the last architecture switched to generic hard irqs the config options HAVE_GENERIC_HARDIRQS & GENERIC_HARDIRQS and the related code for !CONFIG_GENERIC_HARDIRQS can be removed. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* xtensa: add static function tracer supportMax Filippov2013-07-081-0/+1
| | | | | Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
* xtensa: ccount based sched_clockBaruch Siach2013-07-081-0/+1
| | | | | Signed-off-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Chris Zankel <chris@zankel.net>
* xtensa: ccount based clockevent implementationBaruch Siach2013-07-081-0/+1
| | | | | | | | Reused some code from a preliminary implementation by Max Fillippov. Cc: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Chris Zankel <chris@zankel.net>
* Merge tag 'xtensa-next-20130508' of git://github.com/czankel/xtensa-linuxLinus Torvalds2013-05-091-18/+39
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull xtensa updates from Chris Zankel: "Support for the latest MMU architecture that allows for a larger accessible memory region, and various bug-fixes" * tag 'xtensa-next-20130508' of git://github.com/czankel/xtensa-linux: xtensa: Switch to asm-generic/linkage.h xtensa: fix redboot load address xtensa: ISS: fix timer_lock usage in rs_open xtensa: disable IRQs while IRQ handler is running xtensa: enable lockdep support xtensa: fix arch_irqs_disabled_flags implementation xtensa: add irq flags trace support xtensa: provide custom CALLER_ADDR* implementations xtensa: add stacktrace support xtensa: clean up stpill_registers xtensa: don't use a7 in simcalls xtensa: don't attempt to use unconfigured timers xtensa: provide default platform_pcibios_init implementation xtensa: remove KCORE_ELF again xtensa: document MMUv3 setup sequence xtensa: add MMU v3 support xtensa: fix ibreakenable register update xtensa: fix oprofile building as module
| * xtensa: enable lockdep supportMax Filippov2013-05-091-3/+4
| | | | | | | | | | Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
| * xtensa: add irq flags trace supportMax Filippov2013-05-091-0/+3
| | | | | | | | | | Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
| * xtensa: add stacktrace supportMax Filippov2013-05-091-0/+3
| | | | | | | | | | Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
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