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| author | Thomas Weißschuh <linux@weissschuh.net> | 2023-10-05 19:17:29 +0300 |
|---|---|---|
| committer | Thomas Weißschuh <linux@weissschuh.net> | 2023-10-12 22:14:16 +0300 |
| commit | 63aa531716268f22f0a60fbb65c005494dcde387 (patch) | |
| tree | ea27f9c9b7df0f3c361a291b9bd902ea7c499e43 /tools/testing/selftests/nolibc | |
| parent | eddfc3c74214a7e6f4a3e56ad0cf5dab5d23f287 (diff) | |
| download | linux-63aa531716268f22f0a60fbb65c005494dcde387.tar.xz | |
tools/nolibc: add support for constructors and destructors
With the startup code moved to C, implementing support for
constructors and deconstructors is fairly easy to implement.
Examples for code size impact:
text data bss dec hex filename
21837 104 88 22029 560d nolibc-test.before
22135 120 88 22343 5747 nolibc-test.after
21970 104 88 22162 5692 nolibc-test.after-only-crt.h-changes
The sections are defined by [0].
[0] https://refspecs.linuxfoundation.org/elf/gabi4+/ch5.dynamic.html
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/lkml/20231007-nolibc-constructors-v2-1-ef84693efbc1@weissschuh.net/
Diffstat (limited to 'tools/testing/selftests/nolibc')
| -rw-r--r-- | tools/testing/selftests/nolibc/nolibc-test.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c index 7e3936c182dc..8da7f15d010e 100644 --- a/tools/testing/selftests/nolibc/nolibc-test.c +++ b/tools/testing/selftests/nolibc/nolibc-test.c @@ -57,6 +57,9 @@ static int test_argc; /* will be used by some test cases as readable file, please don't write it */ static const char *argv0; +/* will be used by constructor tests */ +static int constructor_test_value; + /* definition of a series of tests */ struct test { const char *name; /* test name */ @@ -594,6 +597,19 @@ int expect_strne(const char *expr, int llen, const char *cmp) #define CASE_TEST(name) \ case __LINE__: llen += printf("%d %s", test, #name); +/* constructors validate that they are executed in definition order */ +__attribute__((constructor)) +static void constructor1(void) +{ + constructor_test_value = 1; +} + +__attribute__((constructor)) +static void constructor2(void) +{ + constructor_test_value *= 2; +} + int run_startup(int min, int max) { int test; @@ -630,6 +646,7 @@ int run_startup(int min, int max) CASE_TEST(environ_HOME); EXPECT_PTRNZ(1, getenv("HOME")); break; CASE_TEST(auxv_addr); EXPECT_PTRGT(test_auxv != (void *)-1, test_auxv, brk); break; CASE_TEST(auxv_AT_UID); EXPECT_EQ(1, getauxval(AT_UID), getuid()); break; + CASE_TEST(constructor); EXPECT_EQ(1, constructor_test_value, 2); break; case __LINE__: return ret; /* must be last */ /* note: do not set any defaults so as to permit holes above */ |