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authorMichael Ellerman <mpe@ellerman.id.au>2014-07-23 17:31:39 +1000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2014-07-28 14:11:33 +1000
commitbd8bbd87f1e4226f576ddbc71d42541418d8f2d3 (patch)
tree267c16df9fc3bc6158c0737c11216bf5b344bfb6 /tools/testing/selftests/powerpc/pmu
parentselftests/powerpc: Add cycles test with MMCR2 handling (diff)
downloadlinux-dev-bd8bbd87f1e4226f576ddbc71d42541418d8f2d3.tar.xz
linux-dev-bd8bbd87f1e4226f576ddbc71d42541418d8f2d3.zip
selftests/powerpc: Add a routine for retrieving an AUXV entry
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'tools/testing/selftests/powerpc/pmu')
-rw-r--r--tools/testing/selftests/powerpc/pmu/lib.c48
-rw-r--r--tools/testing/selftests/powerpc/pmu/lib.h1
2 files changed, 49 insertions, 0 deletions
diff --git a/tools/testing/selftests/powerpc/pmu/lib.c b/tools/testing/selftests/powerpc/pmu/lib.c
index 11e26e8cf33a..9768dea37bf3 100644
--- a/tools/testing/selftests/powerpc/pmu/lib.c
+++ b/tools/testing/selftests/powerpc/pmu/lib.c
@@ -5,10 +5,15 @@
#define _GNU_SOURCE /* For CPU_ZERO etc. */
+#include <elf.h>
#include <errno.h>
+#include <fcntl.h>
+#include <link.h>
#include <sched.h>
#include <setjmp.h>
#include <stdlib.h>
+#include <sys/stat.h>
+#include <sys/types.h>
#include <sys/wait.h>
#include "utils.h"
@@ -250,3 +255,46 @@ out_close:
out:
return rc;
}
+
+static char auxv[4096];
+
+void *get_auxv_entry(int type)
+{
+ ElfW(auxv_t) *p;
+ void *result;
+ ssize_t num;
+ int fd;
+
+ fd = open("/proc/self/auxv", O_RDONLY);
+ if (fd == -1) {
+ perror("open");
+ return NULL;
+ }
+
+ result = NULL;
+
+ num = read(fd, auxv, sizeof(auxv));
+ if (num < 0) {
+ perror("read");
+ goto out;
+ }
+
+ if (num > sizeof(auxv)) {
+ printf("Overflowed auxv buffer\n");
+ goto out;
+ }
+
+ p = (ElfW(auxv_t) *)auxv;
+
+ while (p->a_type != AT_NULL) {
+ if (p->a_type == type) {
+ result = (void *)p->a_un.a_val;
+ break;
+ }
+
+ p++;
+ }
+out:
+ close(fd);
+ return result;
+}
diff --git a/tools/testing/selftests/powerpc/pmu/lib.h b/tools/testing/selftests/powerpc/pmu/lib.h
index ca5d72ae3be6..0f0339c8a6f6 100644
--- a/tools/testing/selftests/powerpc/pmu/lib.h
+++ b/tools/testing/selftests/powerpc/pmu/lib.h
@@ -29,6 +29,7 @@ extern int notify_parent(union pipe write_pipe);
extern int notify_parent_of_error(union pipe write_pipe);
extern pid_t eat_cpu(int (test_function)(void));
extern bool require_paranoia_below(int level);
+extern void *get_auxv_entry(int type);
struct addr_range {
uint64_t first, last;