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* ARM: v6k: select clear exclusive code seqences according to V6 variantsRussell King2011-02-021-7/+7
| | | | | | | | | | | | | | | | If CONFIG_CPU_V6 is enabled, then the kernel must support ARMv6 CPUs which don't have the V6K extensions implemented. Always use the dummy store-exclusive method to ensure that the exclusive monitors are cleared. If CONFIG_CPU_V6 is not set, but CONFIG_CPU_32v6K is enabled, then we have the K extensions available on all CPUs we're building support for, so we can use the new clear-exclusive instruction. Acked-by: Tony Lindgren <tony@atomide.com> Tested-by: Sourav Poddar <sourav.poddar@ti.com> Tested-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* ARM: hw_breakpoint: disable preemption during debug exception handlingWill Deacon2010-12-061-0/+19
| | | | | | | | | | | | | | | | | | On ARM, debug exceptions occur in the form of data or prefetch aborts. One difference is that debug exceptions require access to per-cpu banked registers and data structures which are not saved in the low-level exception code. For kernels built with CONFIG_PREEMPT, there is an unlikely scenario that the debug handler ends up running on a different CPU from the one that originally signalled the event, resulting in random data being read from the wrong registers. This patch adds a debug_entry macro to the low-level exception handling code which checks whether the taken exception is a debug exception. If it is, the preempt count for the faulting process is incremented. After the debug handler has finished, the count is decremented. Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
* ARM: 5991/1: Fix regression in restore_user_regs macroAnders Grafström2010-03-151-0/+2
| | | | | | | | | ARMv5T and earlier require that a ldm {}^ instruction is not followed by an instruction that accesses banked registers. This patch restores the nop that was lost in commit b86040a59feb255a8193173caa4d5199464433d5. Signed-off-by: Anders Grafström <grfstrm@users.sourceforge.net> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* ARM: 5757/1: Thumb-2: Correct "mov.w pc, lr" instruction which is unpredictableCatalin Marinas2009-10-141-0/+15
| | | | | | | | | | The 32-bit wide variant of "mov pc, reg" in Thumb-2 is unpredictable causing improper handling of the undefined instructions not caught by the kernel. This patch adds a movw_pc macro for such situations (currently only used in call_fpe). Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* make Linux bootable on ARM againNicolas Pitre2009-09-261-0/+2
| | | | | | | | | | | | Commit 200b812d00 "Clear the exclusive monitor when returning from an exception" broke the vast majority of ARM systems in the wild which are still pre ARMv6. The kernel is crashing on the first occurrence of an exception due to the removal of the actual return instruction for them. Let's add it back. Signed-off-by: Nicolas Pitre <nico@marvell.com> Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Clear the exclusive monitor when returning from an exceptionCatalin Marinas2009-09-181-0/+14
| | | | | | | | | | | | | | | | 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: Catalin Marinas <catalin.marinas@arm.com> Reported-by: Jamie Lokier <jamie@shareable.org>
* Thumb-2: Implementation of the unified start-up and exceptions codeCatalin Marinas2009-07-241-5/+87
| | | | | | | This patch implements the ARM/Thumb-2 unified kernel start-up and exception handling code. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
* Remove obsolete #include <linux/config.h>Jörn Engel2006-06-301-1/+0
| | | | | Signed-off-by: Jörn Engel <joern@wohnheim.fh-wedel.de> Signed-off-by: Adrian Bunk <bunk@stusta.de>
* [ARM] Move enable_irq and disable_irq to assembler.hRussell King2006-03-231-18/+0
| | | | | | | | 5d25ac038a317d454a4321cba955f756400835a5 broke VFP builds due to enable_irq not being defined as an assembly macro. Move it to assembler.h so everyone can use it. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [ARM] 3102/1: ARM EABI: stack pointer must be 64-bit aligned after a CPU ↵Nicolas Pitre2006-01-141-0/+1
| | | | | | | | | | | | | | | | | | | | exception 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: Nicolas Pitre <nico@cam.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* kbuild: arm - use generic asm-offsets.h supportSam Ravnborg2005-09-091-1/+1
| | | | | | | Delete obsoleted stuff from arch Makefile and rename constants.h to asm-offsets.h Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
* [PATCH] ARM SMP: convert alignment enableRussell King2005-05-311-4/+3
| | | | | | | | | | The current vector entry system does not allow for SMP. In order to work around this, we need to eliminate our reliance on the fixed save areas, which breaks the way we enable alignment traps. This patch makes the alignment trap enable code independent of the way we handle the save areas. Signed-off-by: Russell King <rmk@arm.linux.org.uk>
* [PATCH] ARM: make entry*.S includes more logicalRussell King2005-04-261-12/+9
| | | | | | | Move common includes to entry-header, and file specific includes to the relevant file. Signed-off-by: Russell King <rmk@arm.linux.org.uk>
* [PATCH] ARM: Remove single-use user save/restore macrosRussell King2005-04-261-51/+0
| | | | | | | Assembly macros are pointless if they're only used once. Move them inline. Signed-off-by: Russell King <rmk@arm.linux.org.uk>
* [PATCH] ARM: remove PT_TRACESYSRussell King2005-04-261-2/+0
| | | | | | PT_TRACESYS is unused, remove it. Signed-off-by: Russell King <rmk@arm.linux.org.uk>
* [PATCH] ARM: Remove SVC_MODE definitionRussell King2005-04-261-4/+0
| | | | | | | SVC_MODE reflects the MODE_SVC definition in asm/ptrace.h. Use the asm/ptrace.h definition instead, and remove SVC_MODE. Signed-off-by: Russell King <rmk@arm.linux.org.uk>
* [PATCH] ARM: Use __NR_SYSCALL_BASE and __ARM_NR_BASE in asm codeRussell King2005-04-261-22/+0
| | | | | | | Don't define our own local constants, but use those already defined in asm/unistd.h instead. Signed-off-by: Russell King <rmk@arm.linux.org.uk>
* [PATCH] ARM: pt_regs offsetsRussell King2005-04-261-21/+10
| | | | | | | Generate pt_regs S_xx offsets from the structure itself instead of #defining them. Signed-off-by: Russell King <rmk@arm.linux.org.uk>
* [PATCH] ARM: Remove argument for disable_irq/enable_irqRussell King2005-04-261-10/+6
| | | | | | | Since we do not require a register for these operations, we can remove this unnecessary argument. Signed-off-by: Russell King <rmk@arm.linux.org.uk>
* Linux-2.6.12-rc2Linus Torvalds2005-04-161-0/+182
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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