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2011-04-29ARM: kprobes: Add emulation of hint instructions like NOP and WFIJon Medhurst1-0/+24
Being able to probe NOP instructions is useful for hard-coding probeable locations and is used by the kprobes test code. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-04-29ARM: kprobes: Add emulation of SBFX, UBFX, BFI and BFC instructionsJon Medhurst1-0/+42
These bit field manipulation instructions occur several thousand times in an ARMv7 kernel. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-04-29ARM: kprobes: Add emulation of MOVW and MOVT instructionsJon Medhurst1-2/+28
The MOVW and MOVT instructions account for approximately 7% of all instructions in a ARMv7 kernel as GCC uses them instead of a literal pool. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-04-29ARM: kprobes: Reject probing of undefined data processing instructionsJon Medhurst1-14/+17
The instruction decoding in space_cccc_000x needs to reject probing of instructions with undefined patterns as they may in future become defined and then emulated faultily - as has already happened with the SMC instruction. This fix is achieved by testing for the instruction patterns we want to probe and making the the default fall-through paths reject probes. This also allows us to remove some explicit tests for instructions that we wish to reject, as that is now the default action. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-04-29ARM: kprobes: Remove redundant code in space_1111Jon Medhurst1-9/+5
The tests to explicitly reject probing CPS, RFE and SRS instructions are redundant as the default case is now to reject undecoded patterns. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-04-29ARM: kprobes: Fix emulation of PLD instructionsJon Medhurst1-13/+8
The PLD instructions wasn't being decoded correctly and the emulation code wasn't adjusting PC correctly. As the PLD instruction is only a performance hint we emulate it as a simple nop, and we can broaden the instruction decoding to take into account newer PLI and PLDW instructions. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-04-29ARM: kprobes: Reject probing of SETEND instructionsJon Medhurst1-5/+0
The emulation of SETEND was broken as it changed the endianess for the running kprobes handling code. Rather than adding a new simulation routine to fix this we'll just reject probing of SETEND as these should be very rare in the kernel. Note, the function emulate_none is now unused but it is left in the source code as future patches will use it. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-04-29ARM: kprobes: Consolidate stub decoding functionsJon Medhurst1-31/+9
Following the change to remove support for coprocessor instructions we are left with three stub functions which can be consolidated. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-04-29ARM: kprobes: Reject probing of all coprocessor instructionsJon Medhurst1-102/+11
The kernel doesn't currently support VFP or Neon code, and probing of code with CP15 operations is fraught with bad consequences. Therefore we don't need the ability to probe coprocessor instructions and the code to support this can be removed. The removed code also had at least two bugs: - MRC into R15 should set CPSR not trash PC - LDC and STC which use PC as base register needed the address offset by 8 Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-04-29ARM: kprobes: Fix emulation of USAD8 instructionsJon Medhurst1-6/+4
The USAD8 instruction wasn't being explicitly decoded leading to the incorrect emulation routine being called. It can be correctly decoded in the same way as the signed multiply instructions so we move the decoding there. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-04-29ARM: kprobes: Fix emulation of SMUAD, SMUSD and SMMUL instructionsJon Medhurst1-7/+15
The signed multiply instructions were being decoded incorrectly. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-04-29ARM: kprobes: Fix emulation of SXTB16, SXTB, SXTH, UXTB16, UXTB and UXTH ↵Jon Medhurst1-2/+12
instructions These sign extension instructions are encoded as extend-and-add instructions where the register to add is specified as r15. The decoding routines weren't checking for this and were using the incorrect emulation code, giving incorrect results. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-04-29ARM: kprobes: Reject probing of undefined media instructionsJon Medhurst1-1/+35
The instructions space for media instructions contains some undefined patterns. We need to reject probing of these because they may in future become defined and the kprobes code may then emulate them faultily. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-04-29ARM: kprobes: Add emulation of RBIT instructionJon Medhurst1-1/+2
The v6T2 RBIT instruction was accidentally being emulated correctly, this patch adds correct decoding for the instruction. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-04-29ARM: kprobes: Reject probing of LDRB instructions which load PCJon Medhurst1-0/+4
These instructions are specified as UNPREDICTABLE. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-04-29ARM: kprobes: Fix emulation of LDRD and STRD instructionsJon Medhurst1-6/+6
The decoding of these instructions got the register indexed and immediate indexed forms the wrong way around, causing incorrect emulation. Instructions like "LDRD Rx, [Rx]" were corrupting Rx because the base register writeback was being performed unconditionally, overwriting the value just loaded from memory. The fix is to only writeback the base register when that form of the instruction is used. Note, now that we reject probing writeback with PC the emulation code doesn't need the check rn!=15. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-04-29ARM: kprobes: Reject probing of LDR/STR instructions which update PC ↵Jon Medhurst1-0/+17
unpredictably Using PC as an base register with writeback is UNPREDICTABLE, as is non word-sized loads or stores of PC. (We only really care about preventing loads to PC but it keeps the code simpler if we also exclude stores.) Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-04-29ARM: kprobes: Fix emulation of LDRH, STRH, LDRSB and LDRSH instructionsJon Medhurst1-2/+3
The decoding of these instructions got the register indexed and immediate indexed forms the wrong way around, causing incorrect emulation. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-04-29ARM: kprobes: Reject probing of STREX and LDREX instructionsJon Medhurst1-5/+22
The emulation code for STREX and LDREX instructions is faulty, however, rather than attempting to fix this we reject probes of these instructions. We do this because they can never succeed in gaining exclusive access as the exception framework clears the exclusivity monitor when a probes breakpoint is hit. (This is a general problem when probing all instructions executing between a LDREX and its corresponding STREX and can lead to infinite retry loops.) Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-04-29ARM: kprobes: Reject probing of undefined multiply instructionsJon Medhurst1-3/+8
The instructions space for 'Multiply and multiply-accumulate' instructions contains some undefined patterns. We need to reject probing of these because they may in future become defined and the kprobes code may then emulate them faultily. This has already happened with the new MLS instruction which this patch also adds correct decoding for as well as tightening up other decoding tests. (Before this patch the wrong emulation routine was being called for MLS though it still produced correct results.) Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-04-29ARM: kprobes: Fix error in commentJon Medhurst1-1/+1
Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-04-29ARM: kprobes: Reject probing of instructions which write to PC unpredictably.Jon Medhurst1-0/+28
Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-04-29ARM: kprobes: Fix emulation of MRS instructionJon Medhurst1-11/+12
The MRS instruction should set mode and interrupt bits in the read value so it is simpler to use a new simulation routine (simulate_mrs) rather than some modified emulation. prep_emulate_rd12 is now unused and removed. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-04-29ARM: kprobes: Reject probing MRS instructions which read SPSRJon Medhurst1-5/+7
We need to reject probing of instructions which read SPSR because we can't handle this as the value in SPSR is lost when the exception handler for the probe breakpoint first runs. This patch also fixes the bitmask for MRS instructions decoding to include checking bits 5-7. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-04-29ARM: kprobes: Fix emulation of Data-processing (immediate) instructionsJon Medhurst1-1/+1
Emulation of instructions like "ADD rd, rn, #<const>" would result in a corrupted value for rd. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-04-29ARM: kprobes: Fix emulation of CMP, CMN, TST and TEQ instructions.Jon Medhurst1-2/+53
Probing these instructions was corrupting R0 because the emulation code didn't account for the fact that they don't write a result to a register. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-04-29ARM: kprobes: Remove redundant condition checks from simulation routinesJon Medhurst1-27/+3
Now we have the framework code handling conditionally executed instructions we can remove redundant checks in individual simulation routines. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-04-29ARM: kprobes: Fix probing of conditionally executed instructionsJon Medhurst3-1/+96
When a kprobe is placed onto conditionally executed ARM instructions, many of the emulation routines used to single step them produce corrupt register results. Rather than fix all of these cases we modify the framework which calls them to test the relevant condition flags and, if the test fails, skip calling the emulation code. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-04-29kprobes/arm: Fix ldrd/strd emulationViktor Rosendahl1-5/+15
Currently emulate_ldrd and emulate_strd don't even have the adjustment of the PC value, so in case of Rn == PC, it will not update the PC incorrectly but instead load/store from the wrong address. Let's add both the adjustment of the PC value and the check for PC == PC. Signed-off-by: Viktor Rosendahl <viktor.rosendahl@nokia.com> Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
2011-03-30Merge branch 'irq-fixes-for-linus' of ↵Linus Torvalds1-1/+1
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'irq-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: avr32: Fix missing irq namespace conversion powerpc: qe_ic: Rename get_irq_desc_data and get_irq_desc_chip genirq: Remove the now obsolete config options and select statements arm: versatile : Fix typo introduced in irq namespace cleanup sound: Fixup the last user of the old irq functions genirq: Remove obsolete comment genirq: Remove now obsolete set_irq_wake() sh: Fix irq cleanup fallout x86: apb_timer: Fixup genirq fallout genirq: Fix misnamed label in handle_edge_eoi_irq Fix up crazy conflict in arch/powerpc/include/asm/qe_ic.h: - commit eead4d5c63ff ("powerpc: qe_ic: Rename get_irq_desc_data and get_irq_desc_chip") made the helper functions use irq_desc_get_handler_data() instead of the legacy (and no longer existing) get_irq_desc_data. - commit d4db35e8dc96 ("powerpc/qe_ic: Fix another breakage from the irq_data conversion") used irq_desc_get_chip_data() instead. According to Thomas, the former is the correct direct conversion, but it does look like both should work (arch/powerpc/sysdev/qe_lib/qe_ic.c seems to initialize both to the same thing), and the chip data in some ways is the more logical. Somebody should really decide on one of the other. This merge picks irq_desc_get_handler_data() as the straightforward pure conversion to new names, as per Thomas.
2011-03-30Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-armLinus Torvalds92-248/+962
* 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm: (65 commits) ARM: 6826/1: Merge v6 and v7 DEBUG_LL DCC support ARM: 6838/1: etm: fix section mismatch warning ARM: 6837/1: remove unused pci_fixup_prpmc1100 ARM: 6836/1: kprobes/fix emulation of LDR/STR instruction when Rn == PC Fix the broken build for Marvell Dove platform. ARM: 6835/1: perf: ensure overflows aren't missed due to IRQ latency ARM: 6834/1: perf: reset counters on all CPUs during initialisation ARM: 6833/1: perf: add required isbs() to ARMv7 backend ARM: 6825/1: kernel/sleep.S: fix Thumb2 compilation issues ARM: 6807/1: realview: Fix secondary GIC initialisation for EB with MPCore tile arm: mach-mx3: pcm043: add write-protect and card-detect for SD1 eukrea_mbimxsd51: add SD Card detect eukrea_mbimxsd25-baseboard: add SD card detect mx3/eukrea_mbimxsd-baseboard: add SD card detect support mx3/eukrea_mbimxsd-baseboard: fix gpio request ARM: mxs/mx28evk: add mmc device ARM: mxs/mx23evk: add mmc device ARM: mxs: dynamically allocate mmc device ARM: mx51_efika: update platform data for new mfd changes mx2/iomux: Set direction for CSPI2 pins ...
2011-03-30arm: versatile : Fix typo introduced in irq namespace cleanupGrant Likely1-1/+1
Commit 6845664(arm: Cleanup the irq namespace) introduces a typo causing a build failure for the versatile platform. [ tglx: Sorry, my bad. Have no idea how I fatfingered that ] Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Russell King <linux@arm.linux.org.uk> Cc: linux-arm-kernel@lists.infradead.org LKML-Reference: <20110330060229.27397.7628.stgit@ponder> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2011-03-30Merge branches 'fixes' and 'devel-stable' into for-linusRussell King79-175/+880
2011-03-29Merge branch 'for-linus' of ↵Linus Torvalds3-10/+10
git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc: (26 commits) mmc: SDHI should depend on SUPERH || ARCH_SHMOBILE mmc: tmio_mmc: Move some defines into a shared header mmc: tmio: support aggressive clock gating mmc: tmio: fix power-mode interpretation mmc: tmio: remove work-around for unmasked SDIO interrupts sh: fix SDHI IO address-range ARM: mach-shmobile: fix SDHI IO address-range mmc: tmio: only access registers above 0xff, if available mfd: remove now redundant sh_mobile_sdhi.h header sh: convert boards to use linux/mmc/sh_mobile_sdhi.h ARM: mach-shmobile: convert boards to use linux/mmc/sh_mobile_sdhi.h mmc: tmio: convert the SDHI MMC driver from MFD to a platform driver sh: ecovec: use the CONFIG_MMC_TMIO symbols instead of MFD mmc: tmio: split core functionality, DMA and MFD glue mmc: tmio: use PIO for short transfers mmc: tmio-mmc: Improve DMA stability on sh-mobile mmc: fix mmc_app_send_scr() for dma transfer mmc: sdhci-esdhc: enable esdhc on imx53 mmc: sdhci-esdhc: use writel/readl as general APIs mmc: sdhci: add the abort CMDTYPE bits definition ...
2011-03-29arm: Fold irq_set_chip/irq_set_handlerThomas Gleixner84-235/+209
Use irq_set_chip_and_handler() instead. Converted with coccinelle. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2011-03-29arm: Reorder irq_set_ function callsThomas Gleixner9-11/+11
Reorder irq_set_chip() irq_set_chip_data() irq_set_handler() to irq_set_chip() irq_set_handler() irq_set_chip_data() so the next patch can combine irq_set_chip() and irq_set_handler() to irq_set_chip_and_handler(). Automated conversion with coccinelle. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2011-03-29arm: Cleanup the irq namespaceThomas Gleixner140-610/+626
Convert to the new function names. Automated with coccinelle. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2011-03-29arm: Use generic show_interrupts()Thomas Gleixner2-50/+6
Use the generic version and just keep the arch specific output. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2011-03-29arm: dove: Use proper irq accessor functionsThomas Gleixner2-11/+2
Remove the obsolete desc_handle_irq() helper. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2011-03-29arm: gic: Use proper accessor functionsThomas Gleixner1-1/+1
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2011-03-29arm: at91: Cleanup irq chipThomas Gleixner1-22/+9
Avoid the whole lazy disable dance in the demux handler by providing a irq_disable() callback. Use the proper accessor functions and tidy up gpio_irq_handler() Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2011-03-29arm: davinci: Cleanup irq chip codeThomas Gleixner1-13/+4
Make use of the new functionality which ensures that irq_set_type is called with the chip masked. Unmask is only done when the interrupt is not disabled. Retrieve the trigger type from irq_data in unmask Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2011-03-29arm: ep93xx: Use proper irq accessor functionsThomas Gleixner1-11/+10
No need to write the flow type. Core code does already. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2011-03-29arm: gemini: Use proper irq accessor functionsThomas Gleixner1-4/+2
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2011-03-29arm: mxc: Use generic_handle_irq()Thomas Gleixner1-6/+1
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2011-03-29arm: vt8500: Use proper irq accessorsThomas Gleixner1-3/+3
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2011-03-29arm: msm: Use proper irq accessor functionsThomas Gleixner5-10/+10
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2011-03-29arm: plat-omap: Cleanup irq_desc accessThomas Gleixner1-8/+1
1) Core code stores the flow type already 2) Flow type is accessible in irq_data Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2011-03-29arm: nomadik: Use local irq stateThomas Gleixner1-6/+10
Store the enabled mask in the local state, so there is no need to fiddle in the irq descriptor. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2011-03-29arm: stmp3xxx: Use generic_handle_irq()Thomas Gleixner1-2/+1
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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