diff options
author | Michael Ellerman <mpe@ellerman.id.au> | 2014-07-23 09:31:39 +0200 |
---|---|---|
committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2014-07-28 06:11:33 +0200 |
commit | bd8bbd87f1e4226f576ddbc71d42541418d8f2d3 (patch) | |
tree | 267c16df9fc3bc6158c0737c11216bf5b344bfb6 /tools/testing | |
parent | selftests/powerpc: Add cycles test with MMCR2 handling (diff) | |
download | linux-bd8bbd87f1e4226f576ddbc71d42541418d8f2d3.tar.xz linux-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')
-rw-r--r-- | tools/testing/selftests/powerpc/pmu/lib.c | 48 | ||||
-rw-r--r-- | tools/testing/selftests/powerpc/pmu/lib.h | 1 |
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; |