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* ARM: 6341/1: unwind - optimise linked-list searches for modulesPhil Carmody2010-09-021-0/+2
| | | | | | | | | | | | | | | With several sections per module, and dozens of modules, the searches down the linked list of sections would dominate the lookup time, dwarfing any savings from the binary search within the section. A simple move-to-front optimisation exploits the commonality of the code paths taken, and in simple real-world tests reduces the number of steps in the search to barely more than 1. Signed-off-by: Phil Carmody <ext-phil.2.carmody@nokia.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* ARM: 6140/1: silence a bogus sparse warning in unwind.cAlexander Shishkin2010-05-241-0/+2
| | | | | | | | | The check for compiler which is supposed to miscompile unwind tables clearly has nothing to do with sparse (which does not define necessary macros anyway), so simply silence it. Signed-off-by: Alexander Shishkin <virtuoso@slind.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* ARM: 5977/1: arm: Enable backtrace printing on oops when PC is corruptedLaurent Pinchart2010-03-071-1/+3
| | | | | | | | If PC points outside kernel text, start printing the backtrace at LR instead. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* ARM: 5776/1: Check compiler version and EABI support when adding ARM unwind ↵Claudio Scordino2009-11-021-0/+9
| | | | | | | | | | | | support. ARM unwind is known to compile only with EABI and not-buggy compilers. The problem is not the unwinding information but the -fno-frame-pointer option added as a result of !CONFIG_FRAME_POINTER. Now we check the compiler and raise a #warning in case of wrong compiler. Signed-off-by: Claudio Scordino <claudio@evidence.eu.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* Thumb-2: Implementation of the unified start-up and exceptions codeCatalin Marinas2009-07-241-0/+4
| | | | | | | This patch implements the ARM/Thumb-2 unified kernel start-up and exception handling code. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
* [ARM] 5558/1: Add extra checks to ARM unwinder to avoid tracing corrupt stacksCatalin Marinas2009-06-191-10/+9
| | | | | | | | | | | | | | | | | There are situations where the unwinder goes beyond stack boundaries and unwinds random data. This patch moves the stack boundaries check after the unwind_exec_insn() call and adds an extra check for possible infinite loops (like "mov pc, lr" with pc == lr). The patch also fixes a bug in the unwind instructions interpreter. The 0xb0 instruction can only set PC to LR if this wasn't already set by a previous instruction (this is used on exceptions taken while in kernel mode where svc_entry is annotated with ".save {r0 - pc}"). Tested-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* [ARM] 5383/2: unwind: Add core support for ARM stack unwindingCatalin Marinas2009-02-191-0/+434
This patch adds the main functionality for parsing the stack unwinding information generated by the ARM EABI toolchains. The unwinding information consists of an index with a pair of words per function and a table with unwinding instructions. For more information, see "Exception Handling ABI for the ARM Architecture" at: http://infocenter.arm.com/help/topic/com.arm.doc.subset.swdev.abi/index.html Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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