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[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>
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/include/asm/thread_info.h
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@@ -50,6 +50,7 @@ struct thread_info {
struct restart_block restart_block;
__u64 user_timer;
__u64 system_timer;
unsigned long last_break; /* last breaking-event-address. */
};
/*