From e477f3f01a89a8fd44031e7f2ba6ffcab037336c Mon Sep 17 00:00:00 2001 From: Adrian Hunter Date: Thu, 23 Oct 2014 18:16:03 -0300 Subject: perf tools: Build programs to copy 32-bit compatibility perf tools copy VDSO out of memory. However, on 64-bit machines there may be 32-bit compatibility VDOs also. To copy those requires separate 32-bit executables. This patch adds to the build additional programs perf-read-vdso32 and perf-read-vdsox32 for 32-bit and x32 respectively. Signed-off-by: Adrian Hunter Cc: Peter Zijlstra Cc: David Ahern Cc: Frederic Weisbecker , Cc: Jiri Olsa Cc: Namhyung Kim Cc: Paul Mackerras Cc: Stephane Eranian Link: http://lkml.kernel.org/r/1414061124-26830-15-git-send-email-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/find-vdso-map.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 tools/perf/util/find-vdso-map.c (limited to 'tools/perf/util/find-vdso-map.c') diff --git a/tools/perf/util/find-vdso-map.c b/tools/perf/util/find-vdso-map.c new file mode 100644 index 000000000000..95ef1cffc056 --- /dev/null +++ b/tools/perf/util/find-vdso-map.c @@ -0,0 +1,30 @@ +static int find_vdso_map(void **start, void **end) +{ + FILE *maps; + char line[128]; + int found = 0; + + maps = fopen("/proc/self/maps", "r"); + if (!maps) { + fprintf(stderr, "vdso: cannot open maps\n"); + return -1; + } + + while (!found && fgets(line, sizeof(line), maps)) { + int m = -1; + + /* We care only about private r-x mappings. */ + if (2 != sscanf(line, "%p-%p r-xp %*x %*x:%*x %*u %n", + start, end, &m)) + continue; + if (m < 0) + continue; + + if (!strncmp(&line[m], VDSO__MAP_NAME, + sizeof(VDSO__MAP_NAME) - 1)) + found = 1; + } + + fclose(maps); + return !found; +} -- cgit v1.2.3