--- /dev/null
+lttng_ust_elf unit tests
+========================
+
+This is a series of unit tests for LTTng UST's ELF parser. The parser
+is used to retrieve memory size, build ID, and debug link information
+from ELF objects (standalone executable or shared object) for base
+address statedump or dl events.
+
+The parser should technically be able to read ELF files from any 32-
+or 64-bit architecture, little- or big- endian.
+
+However, to restrict the total amount of testing done, only 4
+architectures representing all combinations of bitness and endianness
+are currently tested:
+
+* x86
+* x86_64
+* armeb
+* aarch64_be
+
+For each architecture, there is a corresponding subdirectory under
+`data`, and each of these directories contains exactly 2 files,
+`main.elf` and `main.elf.debug`.
+
+The ELF files are generated from the trivial `main.c` program found in
+`data/`, using GNU toolchains. The program contains a static array in
+order to ensure the creation of a `.bss` section in the ELF file,
+which is one of the multiple factors leading to different file and
+in-memory size.
+
+The program is compiled with `gcc -g main.c -o main.elf`. On certain
+architectures, it is necessary to explicitly specify the
+`-Wl,--build-id=sha1` flags to include a build ID in the resulting
+executable.
+
+The debug information bundled in `main.elf` is then copied into
+`main.elf.debug` and stripped, and a debug link pointing to this file
+is added to the executable. The commands used are as follow:
+
+ $ objcopy --only-keep-debug main.elf main.elf.debug
+ $ strip -g main.elf
+ $ objcopy --add-gnu-debuglink=main.elf.debug main.elf
--- /dev/null
+/*
+ * Copyright (C) 2015 Antoine Busque <abusque@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <linux/limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <lttng/ust-elf.h>
+#include "tap.h"
+
+#define NUM_ARCH 4
+#define NUM_TESTS_PER_ARCH 11
+#define NUM_TESTS (NUM_ARCH * NUM_TESTS_PER_ARCH)
+
+/*
+ * Expected memsz were computed using libelf, build ID and debug link
+ * were determined through readelf.
+ */
+#define X86_MEMSZ 8192
+#define X86_64_MEMSZ 4194304
+#define ARMEB_MEMSZ 65536
+#define AARCH64_BE_MEMSZ 131072
+
+#define X86_CRC 0x1531f73c
+#define X86_64_CRC 0xa048a98f
+#define ARMEB_CRC 0x9d40261b
+#define AARCH64_BE_CRC 0x2b8cedce
+
+#define BUILD_ID_LEN 20
+#define DBG_FILE "main.elf.debug"
+
+static
+void test_elf(const char *test_dir, const char *arch, uint64_t exp_memsz,
+ uint8_t *exp_build_id, uint32_t exp_crc)
+{
+ char path[PATH_MAX];
+ struct lttng_ust_elf *elf = NULL;
+ int ret = 0;
+ uint64_t memsz = 0;
+ int has_build_id = 0;
+ uint8_t *build_id = NULL;
+ size_t build_id_len = 0;
+ int has_debug_link = 0;
+ char *dbg_file = NULL;
+ uint32_t crc = 0;
+
+ diag("Testing %s support", arch);
+
+ snprintf(path, PATH_MAX, "%s/data/%s/main.elf", test_dir, arch);
+ elf = lttng_ust_elf_create(path);
+ ok(elf != NULL, "lttng_ust_elf_create");
+
+ ret = lttng_ust_elf_get_memsz(elf, &memsz);
+ ok(ret == 0, "lttng_ust_elf_get_memsz returned successfully");
+ ok(memsz == exp_memsz,
+ "memsz - expected: %lu, got: %lu",
+ exp_memsz, memsz);
+
+ ret = lttng_ust_elf_get_build_id(elf, &build_id, &build_id_len,
+ &has_build_id);
+ ok(ret == 0, "lttng_ust_elf_get_build_id returned successfully");
+ ok(has_build_id == 1, "build id marked as found");
+ ok(build_id_len == BUILD_ID_LEN,
+ "build_id_len - expected: %u, got: %u",
+ BUILD_ID_LEN, build_id_len);
+ ok(memcmp(build_id, exp_build_id, build_id_len) == 0,
+ "build_id has expected value");
+
+ ret = lttng_ust_elf_get_debug_link(elf, &dbg_file, &crc,
+ &has_debug_link);
+ ok(ret == 0, "lttng_ust_elf_get_debug_link returned successfully");
+ ok(has_debug_link == 1, "debug link marked as found");
+ ok(strcmp(dbg_file, DBG_FILE) == 0,
+ "debug link filename - expected: %s, got: %s",
+ DBG_FILE, dbg_file);
+ ok(crc == exp_crc,
+ "debug link crc - expected: %#x, got: %#x",
+ exp_crc, crc);
+
+ free(build_id);
+ free(dbg_file);
+ lttng_ust_elf_destroy(elf);
+}
+
+int main(int argc, char **argv)
+{
+ uint8_t X86_BUILD_ID[BUILD_ID_LEN] = {
+ 0x27, 0x79, 0x2a, 0xe7, 0xaa, 0xef, 0x72, 0x5c, 0x9c, 0x52,
+ 0x80, 0xec, 0x1e, 0x18, 0xd8, 0x09, 0x02, 0xba, 0xbc, 0x82
+ };
+ uint8_t X86_64_BUILD_ID[BUILD_ID_LEN] = {
+ 0x0f, 0x87, 0xb2, 0xe2, 0x24, 0x9c, 0xe1, 0xc2, 0x24, 0xb1,
+ 0xf8, 0xb6, 0x65, 0x83, 0xa3, 0xc1, 0xcb, 0x30, 0x5c, 0x63
+ };
+ uint8_t ARMEB_BUILD_ID[BUILD_ID_LEN] = {
+ 0x60, 0x5d, 0x26, 0xa0, 0x0e, 0x30, 0xa4, 0x29, 0xf4, 0xf1,
+ 0x85, 0x53, 0xda, 0x90, 0x68, 0xe1, 0xf5, 0x67, 0xbe, 0x42
+ };
+ uint8_t AARCH64_BE_BUILD_ID[BUILD_ID_LEN] = {
+ 0xb9, 0x0a, 0xa0, 0xed, 0xd1, 0x41, 0x42, 0xc3, 0x34, 0x85,
+ 0xfa, 0x27, 0x2e, 0xa9, 0x2f, 0xd2, 0xe4, 0xf7, 0xb6, 0x60
+ };
+ const char *TEST_DIR = argv[1];
+
+ plan_tests(NUM_TESTS);
+
+ test_elf(TEST_DIR, "x86", X86_MEMSZ, X86_BUILD_ID, X86_CRC);
+ test_elf(TEST_DIR, "x86_64", X86_64_MEMSZ, X86_64_BUILD_ID, X86_64_CRC);
+ test_elf(TEST_DIR, "armeb", ARMEB_MEMSZ, ARMEB_BUILD_ID, ARMEB_CRC);
+ test_elf(TEST_DIR, "aarch64_be", AARCH64_BE_MEMSZ, AARCH64_BE_BUILD_ID,
+ AARCH64_BE_CRC);
+
+ return 0;
+}
projects / lttng-ust.git / commitdiff
