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b=xwTeEsvab709zFyQI9k93t/nyI1n1BCLhqfH7Pd7esKStlGj7syuEBBF5uT3Oi1q45FpGe RtCosuKtkd5H1GBA== Date: Mon, 03 Feb 2025 10:05:10 +0100 Subject: [PATCH 09/16] selftests: vDSO: vdso_standalone_test_x86: Use vdso_init_form_sysinfo_ehdr MIME-Version: 1.0 Message-Id: <20250203-parse_vdso-nolibc-v1-9-9cb6268d77be@linutronix.de> References: <20250203-parse_vdso-nolibc-v1-0-9cb6268d77be@linutronix.de> In-Reply-To: <20250203-parse_vdso-nolibc-v1-0-9cb6268d77be@linutronix.de> To: Kees Cook , Eric Biederman , Shuah Khan , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt , Andy Lutomirski , Thomas Gleixner , Vincenzo Frascino Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, llvm@lists.linux.dev, =?utf-8?q?Thomas_We?= =?utf-8?q?i=C3=9Fschuh?= X-Developer-Signature: v=1; a=ed25519-sha256; t=1738573516; l=1895; i=thomas.weissschuh@linutronix.de; s=20240209; h=from:subject:message-id; bh=C3WrIXo4pF6mfQdzvKKu1BjqdXgy4M3jnZi0dZUjrCw=; b=vqn4AilDy7ubG5y+C+hp2FjcC5G15khR+tILwCvaP1GUME4dr3rv0qNjecgSBJ09SsGUhU9Ln 6sEIXscGBezCysoRDXLnNFoAbxqVNBfjeEVRJkZdbJVF7MPnQxvFLvX X-Developer-Key: i=thomas.weissschuh@linutronix.de; 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Instead of combining the parsing the aux vector with the parsing of the vDSO, split them apart into getauxval() and the regular vdso_init_from_sysinfo_ehdr(). The implementation of getauxval() is taken from tools/include/nolibc/stdlib.h. Signed-off-by: Thomas Weißschuh --- All of this code will be deleted later again. --- .../selftests/vDSO/vdso_standalone_test_x86.c | 27 +++++++++++++++++++++- 1 file changed, 26 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/vDSO/vdso_standalone_test_x86.c b/tools/testing/selftests/vDSO/vdso_standalone_test_x86.c index 644915862af8883131e5defd336f1bd80736fc0f..500608f89c66b5747e3d845ebc54e4c3a35b6ccd 100644 --- a/tools/testing/selftests/vDSO/vdso_standalone_test_x86.c +++ b/tools/testing/selftests/vDSO/vdso_standalone_test_x86.c @@ -15,6 +15,7 @@ #include #include #include +#include #include "parse_vdso.h" @@ -84,6 +85,30 @@ void to_base10(char *lastdig, time_t n) } } +unsigned long getauxval(const unsigned long *auxv, unsigned long type) +{ + unsigned long ret; + + if (!auxv) + return 0; + + while (1) { + if (!auxv[0] && !auxv[1]) { + ret = 0; + break; + } + + if (auxv[0] == type) { + ret = auxv[1]; + break; + } + + auxv += 2; + } + + return ret; +} + void c_main(void **stack) { /* Parse the stack */ @@ -96,7 +121,7 @@ void c_main(void **stack) stack++; /* Now we're pointing at auxv. Initialize the vDSO parser. */ - vdso_init_from_auxv((void *)stack); + vdso_init_from_sysinfo_ehdr(getauxval((unsigned long *)stack, AT_SYSINFO_EHDR)); /* Find gettimeofday. */ typedef long (*gtod_t)(struct timeval *tv, struct timezone *tz);