- 03 10月, 2009 1 次提交
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由 Kirill A. Shutemov 提交于
Instruction fault status register, IFSR, was introduced on ARMv6 to provide status information about the last insturction fault. It needed for proper prefetch abort handling. Now we have three prefetch abort model: * legacy - for CPUs before ARMv6. They doesn't provide neither IFSR nor IFAR. We simulate IFSR with section translation fault status for them to generalize code; * ARMv6 - provides IFSR, but not IFAR; * ARMv7 - provides both IFSR and IFAR. Signed-off-by: NKirill A. Shutemov <kirill@shutemov.name> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 19 9月, 2009 2 次提交
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由 Catalin Marinas 提交于
VFP instructions in the kernel may trigger undefined exceptions if VFP hardware is not present. This patch corrects the loading of such Thumb-2 instructions. It also marks the "no_fp" label as a function so that the linker generate a Thumb address. Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
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由 Catalin Marinas 提交于
The patch adds a CLREX or dummy STREX to the exception return path. This is needed because several atomic/locking operations use a pair of LDREX/STREXEQ and the EQ condition may not always be satisfied. This would leave the exclusive monitor status set and may cause problems with atomic/locking operations in the interrupted code. With this patch, the atomic_set() operation can be a simple STR instruction (on SMP systems, the global exclusive monitor is cleared by STR anyway). Clearing the exclusive monitor during context switch is no longer needed as this is handled by the exception return path anyway. Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com> Reported-by: NJamie Lokier <jamie@shareable.org>
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- 14 8月, 2009 1 次提交
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由 Uwe Kleine-König 提交于
Before this patch enabling and disabling irqs in assembler code and by the hardware wasn't tracked completly. I had to transpose two instructions in arch/arm/lib/bitops.h because restore_irqs doesn't preserve the flags with CONFIG_TRACE_IRQFLAGS=y Signed-off-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de> Cc: Russell King <linux@arm.linux.org.uk> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@redhat.com> Signed-off-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de>
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- 24 7月, 2009 2 次提交
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由 Catalin Marinas 提交于
This patch implements the ARM/Thumb-2 unified kernel start-up and exception handling code. Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
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由 Catalin Marinas 提交于
Since the Thumb-2 instructions can be 16-bit wide, data in the .text sections may not be aligned to a 32-bit word and this leads to unaligned exceptions. This patch does not affect the ARM code generation. Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
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- 30 5月, 2009 1 次提交
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由 Catalin Marinas 提交于
Starting with ARMv6, the CPUs support the BE-8 variant of big-endian (byte-invariant). This patch adds the core support: - setting of the BE-8 mode via the CPSR.E register for both kernel and user threads - big-endian page table walking - REV used to rotate instructions read from memory during fault processing as they are still little-endian format - Kconfig and Makefile support for BE-8. The --be8 option must be passed to the final linking stage to convert the instructions to little-endian Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
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- 29 5月, 2009 1 次提交
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由 Russell King 提交于
Mathieu Desnoyers pointed out that the ARM barriers were lacking: - cmpxchg, xchg and atomic add return need memory barriers on architectures which can reorder the relative order in which memory read/writes can be seen between CPUs, which seems to include recent ARM architectures. Those barriers are currently missing on ARM. - test_and_xxx_bit were missing SMP barriers. So put these barriers in. Provide separate atomic_add/atomic_sub operations which do not require barriers. Reported-Reviewed-and-Acked-by: NMathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 19 2月, 2009 1 次提交
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由 Catalin Marinas 提交于
This is needed to allow or stop the unwinding at certain points in the kernel like exception entries. Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 28 1月, 2009 1 次提交
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由 Russell King 提交于
Aaro says: > With spinlock debugs enabled I get might_sleep() warnings when using > ptrace. tracked down to a missing enable_irq before calling do_undefinstr(). Reported-by: NAaro Koskinen <aaro.koskinen@nokia.com> Tested-by: NAaro Koskinen <aaro.koskinen@nokia.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 01 9月, 2008 1 次提交
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由 Catalin Marinas 提交于
This declaration specifies the "function" type and size for various assembly functions, mainly needed for generating the correct branch instructions in Thumb-2. Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 07 8月, 2008 1 次提交
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由 Russell King 提交于
This just leaves include/asm-arm/plat-* to deal with. Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 19 4月, 2008 3 次提交
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由 Russell King 提交于
Luc Van Oostenryck reported: The code removed by this patch tested the irq_cpustat_t members __local_irq_count and __local_bh_count but these fields have been removed some time ago: http://git.kernel.org/?p=linux/kernel/git/tglx/history.git;a=commitdiff;h=3ab146c93e039dec99fec8d441a8dd046fe510cc Fix this oversight. Acked-by: NBill Gatliff <bgat@billgatliff.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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由 Paul Brook 提交于
This patch implements Thumb-2 application support in Linux. Original implementation by Paul Brook with fixes for VFP and Neon by Catalin Marinas. Signed-off-by: NPaul Brook <paul@codesourcery.com> Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
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由 Paul Brook 提交于
This patch adds a prefetch abort handler similar to the data abort one and renames the latter for consistency. Initial implementation by Paul Brook with some renaming by Catalin Marinas. Signed-off-by: NPaul Brook <paul@codesourcery.com> Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
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- 26 1月, 2008 4 次提交
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由 Nicolas Pitre 提交于
Signed-off-by: NNicolas Pitre <nico@marvell.com>
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由 Nicolas Pitre 提交于
If kprobes installs a breakpoint on a "stmdb sp!, {...}" instruction, and then single-step it by simulation from the exception context, it will corrupt the saved regs on the stack from the previous context. To avoid this, let's add an optional parameter to the svc_entry macro allowing for a hole to be created on the stack before saving the interrupted context, and use it in the undef_svc handler when kprobes is enabled. Signed-off-by: NNicolas Pitre <nico@marvell.com>
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由 Nicolas Pitre 提交于
Signed-off-by: NNicolas Pitre <nico@cam.org> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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由 Catalin Marinas 提交于
This patch enables the use of the Advanced SIMD (NEON) extension on ARMv7. The NEON technology is a 64/128-bit hybrid SIMD architecture for accelerating the performance of multimedia and signal processing applications. The extension shares the registers with the VFP unit and enabling/disabling and saving/restoring follow the same rules. In addition, there are instructions that do not have the appropriate CP number encoded, the checks being made in the call_fpe function. Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 27 11月, 2007 2 次提交
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由 Nicolas Pitre 提交于
The ldrt fixup code expects r9 to be set. Signed-off-by: NNicolas Pitre <nico@marvell.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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由 Nicolas Pitre 提交于
The ARM __kuser_cmpxchg routine is meant to implement an atomic cmpxchg in user space. It however can produce spurious false negative if a processor exception occurs in the middle of the operation. Normally this is not a problem since cmpxchg is typically called in a loop until it succeeds to implement an atomic increment for example. Some use cases which don't involve a loop require that the operation be 100% reliable though. This patch changes the implementation so to reattempt the operation after an exception has occurred in the critical section rather than abort it. Here's a simple program to test the fix (don't use CONFIG_NO_HZ in your kernel as this depends on a sufficiently high interrupt rate): #include <stdio.h> typedef int (__kernel_cmpxchg_t)(int oldval, int newval, int *ptr); #define __kernel_cmpxchg (*(__kernel_cmpxchg_t *)0xffff0fc0) int main() { int i, x = 0; for (i = 0; i < 100000000; i++) { int v = x; if (__kernel_cmpxchg(v, v+1, &x)) printf("failed at %d: %d vs %d\n", i, v, x); } printf("done with %d vs %d\n", i, x); return 0; } Signed-off-by: NNicolas Pitre <nico@marvell.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 17 2月, 2007 1 次提交
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由 Dan Williams 提交于
get_irqnr_preamble allows machines to take some action before entering the get_irqnr_and_base loop. On iop we enable cp6 access. arch_ret_to_user is added to the userspace return path to allow individual architectures to take actions, like disabling coprocessor access, before the final return to userspace. Per Nicolas Pitre's note, there is no need to cp_wait on the return to user as the latency to return is sufficient. Signed-off-by: NDan Williams <dan.j.williams@intel.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 07 2月, 2007 1 次提交
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由 Russell King 提交于
bad_mode() currently prints the mode which caused the exception, and then causes an oops dump to be printed which again displays this information (since the CPSR in the struct pt_regs is correct.) This leads to processor_modes[] being shared between traps.c and process.c with a local declaration of it. We can clean this up by moving processor_modes[] to process.c and removing the duplication, resulting in processor_modes[] becoming static. Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 07 1月, 2007 1 次提交
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由 Russell King 提交于
If the kernel attempts to execute a CP1 or CP2 instruction and it aborts, and a FP emulator is not loaded, we try to return as if to a user context, instead of the proper kernel context. Since the fault came from kernel mode, we must use the kernel return paths. Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 04 12月, 2006 1 次提交
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由 Lennert Buytenhek 提交于
XScale cores either have a DSP coprocessor (which contains a single 40 bit accumulator register), or an iWMMXt coprocessor (which contains eight 64 bit registers.) Because of the small amount of state in the DSP coprocessor, access to the DSP coprocessor (CP0) is always enabled, and DSP context switching is done unconditionally on every task switch. Access to the iWMMXt coprocessor (CP0/CP1) is enabled only when an iWMMXt instruction is first issued, and iWMMXt context switching is done lazily. CONFIG_IWMMXT is supposed to mean 'the cpu we will be running on will have iWMMXt support', but boards are supposed to select this config symbol by hand, and at least one pxa27x board doesn't get this right, so on that board, proc-xscale.S will incorrectly assume that we have a DSP coprocessor, enable CP0 on boot, and we will then only save the first iWMMXt register (wR0) on context switches, which is Bad. This patch redefines CONFIG_IWMMXT as 'the cpu we will be running on might have iWMMXt support, and we will enable iWMMXt context switching if it does.' This means that with this patch, running a CONFIG_IWMMXT=n kernel on an iWMMXt-capable CPU will no longer potentially corrupt iWMMXt state over context switches, and running a CONFIG_IWMMXT=y kernel on a non-iWMMXt capable CPU will still do DSP context save/restore. These changes should make iWMMXt work on PXA3xx, and as a side effect, enable proper acc0 save/restore on non-iWMMXt capable xsc3 cores such as IOP13xx and IXP23xx (which will not have CONFIG_CPU_XSCALE defined), as well as setting and using HWCAP_IWMMXT properly. Signed-off-by: NLennert Buytenhek <buytenh@wantstofly.org> Acked-by: NDan Williams <dan.j.williams@intel.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 20 9月, 2006 1 次提交
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由 Russell King 提交于
This adds support for irqtrace for lockdep on ARM. Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 19 8月, 2006 1 次提交
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由 Nicolas Pitre 提交于
Patch from Nicolas Pitre The userspace helpers in clean/arch/arm/kernel/entry-armv.S are called directly in/from userspace. They need to cope with being called from Thumb code. Patch below uses the bx interworking instruction when CONFIG_ARM_THUMB=y. Based on an earlier patch from Paul Brook <paul@codesourcery.com> Signed-off-by: NNicolas Pitre <nico@cam.org> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 02 7月, 2006 1 次提交
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由 Lennert Buytenhek 提交于
Patch from Lennert Buytenhek This patch makes the iWMMXt context switch hook use the generic thread notifier infrastructure that was recently merged in commit d6551e88. Signed-off-by: NLennert Buytenhek <buytenh@wantstofly.org> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 01 7月, 2006 1 次提交
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由 Jörn Engel 提交于
Signed-off-by: NJörn Engel <joern@wohnheim.fh-wedel.de> Signed-off-by: NAdrian Bunk <bunk@stusta.de>
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- 29 6月, 2006 1 次提交
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由 Lennert Buytenhek 提交于
Patch from Lennert Buytenhek Add the necessary kernel bits for crunch task switching. Signed-off-by: NLennert Buytenhek <buytenh@wantstofly.org> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 22 6月, 2006 1 次提交
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由 Russell King 提交于
Some machine classes need to allow VFP support to be built into the kernel, but still allow the kernel to run even though VFP isn't present. Unfortunately, the kernel hard-codes VFP instructions into the thread switch, which prevents this being run-time selectable. Solve this by introducing a notifier which things such as VFP can hook into to be informed of events which affect the VFP subsystem (eg, creation and destruction of threads, switches between threads.) Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 29 3月, 2006 1 次提交
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由 Paul Brook 提交于
Patch from Paul Brook The example code in the source documentation for __kernel_dmb clobbers r0 but doesn't list it the asm clobber list. Signed-off-by: NPaul Brook <paul@codesourcery.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 22 3月, 2006 1 次提交
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由 Russell King 提交于
Allow the individual coprocessor handlers to decide when to enable interrupts, rather than unconditionally enabling them. Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 23 2月, 2006 1 次提交
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由 Russell King 提交于
CONFIG_CPU_MPCORE has never been a configuration symbol - it should be CONFIG_CPU_32v6K. Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 09 2月, 2006 2 次提交
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由 Nicolas Pitre 提交于
negative Patch from Nicolas Pitre The pre ARMv5 implementation can be aborted if an exception occurs in the middle of it. Because of that, the ARMv6 implementation doesn't re-attempt the operation on a failed strex either. Let's make this transient nature of such a false positive more explicit in the definition. Signed-off-by: NNicolas Pitre <nico@cam.org> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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由 Nicolas Pitre 提交于
Patch from Nicolas Pitre The cmpxchg emulation on pre-ARMv5 relies on user code executed from a kernel address. If the operation cannot complete atomically, it is aborted from the usr_entry macro by clearing the Z flag. This clearing of the Z flag is done whenever the user pc is above TASK_SIZE. However this "pc >= TASK_SIZE" test cannot work in the non MMU case. Worse: the current code will corrupt the Z flag on every entry to the kernel. Let's disable it in the non MMU case for now. Using NPTL on non MMU targets needs to be worked out anyway. Signed-off-by: NNicolas Pitre <nico@cam.org> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 19 1月, 2006 1 次提交
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由 Nicolas Pitre 提交于
Patch from Nicolas Pitre This is kernel provided user space code. Since a syscall is used, it has to be updated to work with EABI. Signed-off-by: NNicolas Pitre <nico@cam.org> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 15 1月, 2006 1 次提交
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由 Nicolas Pitre 提交于
Patch from Nicolas Pitre The ARM EABI says that the stack pointer has to be 64-bit aligned for reasons already mentioned in patch #3101 when calling C functions. We therefore must verify and adjust sp accordingly when taking an exception from kernel mode since sp might not necessarily be 64-bit aligned if the exception occurs in the middle of a kernel function. If the exception occurs while in user mode then no sp fixup is needed as long as sizeof(struct pt_regs) as well as any additional syscall data stack space remain multiples of 8. Signed-off-by: NNicolas Pitre <nico@cam.org> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 14 1月, 2006 1 次提交
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由 Hyok S. Choi 提交于
This patch adds register switch support in nommu mode. Signed-off-by: NHyok S. Choi <hyok.choi@samsung.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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- 04 1月, 2006 1 次提交
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由 Russell King 提交于
arch/arm/kernel/entry-armv.S has contained a comment suggesting that asm/hardware.h and asm/arch/irqs.h should be moved into the asm/arch/entry-macro.S include. So move the includes to these two files as required. Add missing includes (asm/hardware.h, asm/io.h) to asm/arch/system.h includes which use those facilities, and remove asm/io.h from kernel/process.c. Remove other unnecessary includes from arch/arm/kernel, arch/arm/mm and arch/arm/mach-footbridge. Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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