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52a1f73d17
In case of a kernel crash caused by a protection exception, print the unmodified PSW address as reported by the CPU. The protection exception handler modifies the PSW address in order to keep fault handling easy, however that leads to misleading call traces. Therefore restore the original PSW address before printing it. Before this change the output in case of a protection exception looks like this: Oops: 0004 ilc:2 [#1]SMP Krnl PSW : 0704c00180000000 000003ffe0b40d78 (sysrq_handle_crash+0x28/0x40) R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:0 PM:0 RI:0 EA:3 ... Krnl Code: 000003ffe0b40d66: e3e0f0980024 stg %r14,152(%r15) 000003ffe0b40d6c: c010fffffff2 larl %r1,000003ffe0b40d50 #000003ffe0b40d72: c0200046b6bc larl %r2,000003ffe1417aea >000003ffe0b40d78: 92021000 mvi 0(%r1),2 000003ffe0b40d7c: c0e5ffae03d6 brasl %r14,000003ffe0101528 With this change it looks like this: Oops: 0004 ilc:2 [#1]SMP Krnl PSW : 0704c00180000000 000003ffe0b40dfc (sysrq_handle_crash+0x2c/0x40) R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:0 PM:0 RI:0 EA:3 ... Krnl Code: 000003ffe0b40dec: c010fffffff2 larl %r1,000003ffe0b40dd0 000003ffe0b40df2: c0200046b67c larl %r2,000003ffe1417aea *000003ffe0b40df8: 92021000 mvi 0(%r1),2 >000003ffe0b40dfc: c0e5ffae03b6 brasl %r14,000003ffe0101568 000003ffe0b40e02: 0707 bcr 0,%r7 Note that with this change the PSW address points to the instruction behind the instruction which caused the exception like it is expected for protection exceptions. This also replaces the '#' marker in the disassembly with '*', which allows to distinguish between new and old behavior. Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.