diff options
author | Michael Ellerman <mpe@ellerman.id.au> | 2015-11-24 05:05:38 +0300 |
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committer | Michael Ellerman <mpe@ellerman.id.au> | 2015-12-14 12:41:47 +0300 |
commit | fcb45ec074725baeb3aaa1b1854b9f44c3eebacf (patch) | |
tree | 5bed3b7b288a554cd633df3d387127638df12819 /tools/testing/selftests/powerpc/utils.c | |
parent | 1901d8bb45c3b82335c48e6232871f72ad10ed95 (diff) | |
download | linux-fcb45ec074725baeb3aaa1b1854b9f44c3eebacf.tar.xz |
selftests/powerpc: Move get_auxv_entry() into utils.c
This doesn't really belong in harness.c, it's a helper function. So move
it into utils.c.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'tools/testing/selftests/powerpc/utils.c')
-rw-r--r-- | tools/testing/selftests/powerpc/utils.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/tools/testing/selftests/powerpc/utils.c b/tools/testing/selftests/powerpc/utils.c new file mode 100644 index 000000000000..536113add380 --- /dev/null +++ b/tools/testing/selftests/powerpc/utils.c @@ -0,0 +1,58 @@ +/* + * Copyright 2013-2015, Michael Ellerman, IBM Corp. + * Licensed under GPLv2. + */ + +#include <elf.h> +#include <errno.h> +#include <fcntl.h> +#include <link.h> +#include <stdio.h> +#include <sys/stat.h> +#include <sys/types.h> +#include <unistd.h> + +#include "utils.h" + +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; +} |