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perf: Fix unaligned accesses while fetching trace values

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Accessing trace values of an 8 size may end up in a segfault
on archs that can't deal with misaligned access, which is the
case for sparc 64. This is because PERF_SAMPLE_RAW are aligned
to 4 and not to 8.

Fix this on the macros that get the values of 8 size.

This fixes segfaults on perf tools in sparc 64.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Tom Zanussi <tzanussi@gmail.com>
Cc: Masami Hiramatsu <mhiramat@redhat.com>
Cc: David Miller <davem@davemloft.net>
This commit is contained in:
Frederic Weisbecker 2010-05-20 10:34:59 +02:00
parent 49f135ed02
commit 85cb68b27c
1 changed files with 6 additions and 1 deletions
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7
tools/perf/util/trace-event.h
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@ -233,7 +233,12 @@ static inline unsigned long long __data2host8(unsigned long long data)
#define data2host2(ptr) __data2host2(*(unsigned short *)ptr)
#define data2host4(ptr) __data2host4(*(unsigned int *)ptr)
#define data2host8(ptr) __data2host8(*(unsigned long long *)ptr)
#define data2host8(ptr) ({ \
unsigned long long __val; \
\
memcpy(&__val, (ptr), sizeof(unsigned long long)); \
__data2host8(__val); \
})
extern int header_page_ts_offset;
extern int header_page_ts_size;