[S390] add breaking event address for user space

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Copy the last breaking event address from the lowcore to a new
field in the thread_struct on each system entry. Add a new
ptrace request PTRACE_GET_LAST_BREAK and a new utrace regset
REGSET_LAST_BREAK to query the last breaking event.

This is useful for debugging wild branches in user space code.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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This commit is contained in:

Martin Schwidefsky

2010-05-17 10:00:05 +02:00

committed by Martin Schwidefsky

parent cd3b70f5d4

commit 86f2552bbd

8 changed files with 223 additions and 127 deletions

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arch/s390/kernel/entry64.S

+146 -124

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