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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::52a; envelope-from=richard.henderson@linaro.org; helo=mail-pg1-x52a.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1629315491868100001 Content-Type: text/plain; charset="utf-8" A mostly generic test for unaligned access raising SIGBUS. Signed-off-by: Richard Henderson Reviewed-by: Peter Maydell --- tests/tcg/multiarch/sigbus.c | 68 ++++++++++++++++++++++++++++++++++++ 1 file changed, 68 insertions(+) create mode 100644 tests/tcg/multiarch/sigbus.c diff --git a/tests/tcg/multiarch/sigbus.c b/tests/tcg/multiarch/sigbus.c new file mode 100644 index 0000000000..8134c5fd56 --- /dev/null +++ b/tests/tcg/multiarch/sigbus.c @@ -0,0 +1,68 @@ +#define _GNU_SOURCE 1 + +#include +#include +#include +#include + + +unsigned long long x =3D 0x8877665544332211ull; +void * volatile p =3D (void *)&x + 1; + +void sigbus(int sig, siginfo_t *info, void *uc) +{ + assert(sig =3D=3D SIGBUS); + assert(info->si_signo =3D=3D SIGBUS); +#ifdef BUS_ADRALN + assert(info->si_code =3D=3D BUS_ADRALN); +#endif + assert(info->si_addr =3D=3D p); + exit(EXIT_SUCCESS); +} + +int main() +{ + struct sigaction sa =3D { + .sa_sigaction =3D sigbus, + .sa_flags =3D SA_SIGINFO + }; + int allow_fail =3D 0; + int tmp; + + tmp =3D sigaction(SIGBUS, &sa, NULL); + assert(tmp =3D=3D 0); + + /* + * Select an operation that's likely to enforce alignment. + * On many guests that support unaligned accesses by default, + * this is often an atomic operation. + */ +#if defined(__aarch64__) + asm volatile("ldxr %w0,[%1]" : "=3Dr"(tmp) : "r"(p) : "memory"); +#elif defined(__alpha__) + asm volatile("ldl_l %0,0(%1)" : "=3Dr"(tmp) : "r"(p) : "memory"); +#elif defined(__arm__) + asm volatile("ldrex %0,[%1]" : "=3Dr"(tmp) : "r"(p) : "memory"); +#elif defined(__powerpc__) + asm volatile("lwarx %0,0,%1" : "=3Dr"(tmp) : "r"(p) : "memory"); +#elif defined(__riscv_atomic) + asm volatile("lr.w %0,(%1)" : "=3Dr"(tmp) : "r"(p) : "memory"); +#else + /* No insn known to fault unaligned -- try for a straight load. */ + allow_fail =3D 1; + tmp =3D *(volatile int *)p; +#endif + + assert(allow_fail); + + /* + * We didn't see a signal. + * We might as well validate the unaligned load worked. + */ + if (BYTE_ORDER =3D=3D LITTLE_ENDIAN) { + assert(tmp =3D=3D 0x55443322); + } else { + assert(tmp =3D=3D 0x77665544); + } + return EXIT_SUCCESS; +} --=20 2.25.1