perf trace: Allow printing syscall return values in hex
event_format->flags has a FIELD_IS_POINTER, but it is not set for the sys_exit 'ret' field in syscalls like mmap, so we need a way to ask for hex printing for pointer returns and keep things like 'read' returns printing in decimal. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-lfuveegw4od1t08n7bsmonrm@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -22,13 +22,18 @@ static struct syscall_fmt {
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const char *alias;
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bool errmsg;
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bool timeout;
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bool hexret;
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} syscall_fmts[] = {
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{ .name = "access", .errmsg = true, },
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{ .name = "arch_prctl", .errmsg = true, .alias = "prctl", },
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{ .name = "brk", .hexret = true, },
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{ .name = "mmap", .hexret = true, },
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{ .name = "connect", .errmsg = true, },
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{ .name = "fstat", .errmsg = true, .alias = "newfstat", },
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{ .name = "fstatat", .errmsg = true, .alias = "newfstatat", },
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{ .name = "futex", .errmsg = true, },
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{ .name = "mmap", .hexret = true, },
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{ .name = "mremap", .hexret = true, },
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{ .name = "open", .errmsg = true, },
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{ .name = "poll", .errmsg = true, .timeout = true, },
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{ .name = "ppoll", .errmsg = true, .timeout = true, },
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@ -475,6 +480,8 @@ signed_print:
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fprintf(trace->output, ") = -1 %s %s", e, emsg);
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} else if (ret == 0 && sc->fmt->timeout)
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fprintf(trace->output, ") = 0 Timeout");
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else if (sc->fmt->hexret)
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fprintf(trace->output, ") = %#x", ret);
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else
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goto signed_print;
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