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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=148.163.158.5; envelope-from=iii@linux.ibm.com; helo=mx0b-001b2d01.pphosted.com X-Spam_score_int: -19 X-Spam_score: -2.0 X-Spam_bar: -- X-Spam_report: (-2.0 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, 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: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @ibm.com) X-ZM-MESSAGEID: 1770207076065154100 Add a test to prevent regressions. Data is generated using a libFuzzer-based fuzzer and hopefully covers all the important corner cases. Acked-by: Alex Benn=C3=A9e Signed-off-by: Ilya Leoshkevich --- tests/tcg/s390x/Makefile.target | 5 + tests/tcg/s390x/divide-to-integer.c | 265 ++++++++++++++++++++++++++++ 2 files changed, 270 insertions(+) create mode 100644 tests/tcg/s390x/divide-to-integer.c diff --git a/tests/tcg/s390x/Makefile.target b/tests/tcg/s390x/Makefile.tar= get index da5fe71a407..0ca030ded01 100644 --- a/tests/tcg/s390x/Makefile.target +++ b/tests/tcg/s390x/Makefile.target @@ -49,14 +49,19 @@ TESTS+=3Dcvd TESTS+=3Dcvb TESTS+=3Dts TESTS+=3Dex-smc +TESTS+=3Ddivide-to-integer =20 cdsg: CFLAGS+=3D-pthread cdsg: LDFLAGS+=3D-pthread =20 +# The following tests contain inline assembly that requires inlining, +# and thus cannot be built with -O0. rxsbg: CFLAGS+=3D-O2 +divide-to-integer: CFLAGS+=3D-O2 =20 cgebra: LDFLAGS+=3D-lm clgebr: LDFLAGS+=3D-lm +divide-to-integer: LDFLAGS+=3D-lm =20 include $(S390X_SRC)/pgm-specification.mak $(PGM_SPECIFICATION_TESTS): pgm-specification-user.o diff --git a/tests/tcg/s390x/divide-to-integer.c b/tests/tcg/s390x/divide-t= o-integer.c new file mode 100644 index 00000000000..62b4787ec0e --- /dev/null +++ b/tests/tcg/s390x/divide-to-integer.c @@ -0,0 +1,265 @@ +/* + * Test DIEBR and DIDBR instructions. + * + * Most inputs were discovered by fuzzing and exercise various corner case= s in + * the helpers. + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ +#include +#include +#include +#include + +static void sigfpe_handler(int sig, siginfo_t *info, void *puc) +{ + struct ucontext *uc =3D puc; + unsigned short *xr_insn; + int r; + + xr_insn =3D (unsigned short *)(uc->uc_mcontext.regs.psw.addr - 6); + r =3D *xr_insn & 0xf; + uc->uc_mcontext.regs.gprs[r] =3D sig; +} + +#define DIVIDE_TO_INTEGER(name, floatN) = \ +static inline __attribute__((__always_inline__)) int = \ +name(floatN *r1, floatN r2, floatN *r3, int m4, int *sig) = \ +{ = \ + int cc; = \ + = \ + asm(/* Make the initial CC predictable for suppression tests */ = \ + "xr %[sig],%[sig]\n" = \ + #name " %[r1],%[r3],%[r2],%[m4]\n" = \ + "ipm %[cc]\n" = \ + "srl %[cc],28" = \ + /* = \ + * Use earlyclobbers to prevent the compiler from reusing floating= \ + * point registers. This instruction doesn't like it. = \ + */ = \ + : [r1] "+&f" (*r1), [r3] "+&f" (*r3), [sig] "=3Dr" (*sig), [cc] "= =3Dd" (cc)\ + : [r2] "f" (r2), [m4] "i" (m4) = \ + : "cc"); = \ + = \ + return cc; = \ +} + +DIVIDE_TO_INTEGER(diebr, float) +DIVIDE_TO_INTEGER(didbr, double) + +#define TEST_DIVIDE_TO_INTEGER(name, intN, int_fmt, floatN, float_fmt) = \ +static inline __attribute__((__always_inline__)) int = \ +test_ ## name(unsigned intN r1i, unsigned intN r2i, int m4, int fpc, = \ + unsigned intN r1o, unsigned intN r3o, int cco, unsigned int = fpco,\ + int sigo) = \ +{ = \ + union { = \ + floatN f; = \ + unsigned intN i; = \ + } r1, r2, r3; = \ + int cc, err =3D 0, sig; = \ + = \ + r1.i =3D r1i; = \ + r2.i =3D r2i; = \ + r3.i =3D 0x12345678; = \ + printf("[ RUN ] %" float_fmt "(0x%" int_fmt = \ + ") / %" float_fmt "(0x%" int_fmt ")\n", r1.f, r1.i, r2.f, r2.i)= ; \ + asm volatile("sfpc %[fpc]" : : [fpc] "r" (fpc)); = \ + cc =3D name(&r1.f, r2.f, &r3.f, m4, &sig); = \ + asm volatile("stfpc %[fpc]" : [fpc] "=3DQ" (fpc)); = \ + if (r1.i !=3D r1o) { = \ + printf("[ FAILED ] remainder 0x%" int_fmt = \ + " !=3D expected 0x%" int_fmt "\n", r1.i, r1o); = \ + err +=3D 1; = \ + } = \ + if (r3.i !=3D r3o) { = \ + printf("[ FAILED ] quotient 0x%" int_fmt = \ + " !=3D expected 0x%" int_fmt "\n", r3.i, r3o); = \ + err +=3D 1; = \ + } = \ + if (cc !=3D cco) { = \ + printf("[ FAILED ] cc %d !=3D expected %d\n", cc, cco); = \ + err +=3D 1; = \ + } = \ + if (fpc !=3D fpco) { = \ + printf("[ FAILED ] fpc 0x%x !=3D expected 0x%x\n", fpc, fpco); = \ + err +=3D 1; = \ + } = \ + if (sig !=3D sigo) { = \ + printf("[ FAILED ] signal 0x%x !=3D expected 0x%x\n", sig, sigo)= ; \ + err +=3D 1; = \ + } = \ + = \ + return err; = \ +} + +TEST_DIVIDE_TO_INTEGER(diebr, int, "x", float, "f") +TEST_DIVIDE_TO_INTEGER(didbr, long, "lx", double, "lf") + +int main(void) +{ + struct sigaction act =3D { + .sa_sigaction =3D sigfpe_handler, + .sa_flags =3D SA_SIGINFO, + }; + int err =3D 0; + + /* Set up SIG handler */ + if (sigaction(SIGFPE, &act, NULL)) { + printf("[ FAILED ] sigaction(SIGFPE) failed\n"); + return EXIT_FAILURE; + } + + /* 451 / 460 */ + err +=3D test_diebr(0x43e1f1f1, 0x43e61616, 7, 0, + 0x43e1f1f1, 0, 0, 0, 0); + + /* 480 / 0 */ + err +=3D test_diebr(0x43f00000, 0, 0, 0, + 0x7fc00000, 0x7fc00000, 1, 0x800000, 0); + + /* QNaN / QNaN */ + err +=3D test_diebr(0xffffffff, 0xffffffff, 0, 0, + 0xffffffff, 0xffffffff, 1, 0, 0); + + /* -2.08E-8 / -2.08E-8 */ + err +=3D test_diebr(0xb2b2b2b2, 0xb2b2b2b2, 0, 0, + 0x80000000, 0x3f800000, 0, 0, 0); + + /* + * Test partial remainder without quotient scaling (cc2). + * + * a =3D 12401981 / 268435456 + * b =3D -5723991 / 72057594037927936 + * q =3D a / b =3D -3329131425038336 / 5723991 =3D~ -581610178.1 + * n =3D round(q, float32, nearest_even) =3D -581610176 + * r_precise =3D a - b * n =3D 189155 / 1125899906842624 + * r =3D round(r_precise, float32, nearest_even) =3D r_precise + */ + err +=3D test_diebr(0x3d3d3d3d, 0xaeaeaeae, 0, 0, + 0x2f38b8c0, 0xce0aaaab, 2, 0, 0); + + /* 1.07E-31 / 2.19 */ + err +=3D test_diebr(0x0c0c0c0c, 0x400c0c0c, 6, 0, + 0xc00c0c0c, 0x3f800000, 0, 0x80000, 0); + + /* + * Test partial remainder with quotient scaling (cc3). + * + * a =3D 298343530578310714772108083200 + * b =3D -592137/10384593717069655257060992658440192 + * q =3D a / b + * =3D -103272545105730134013704301472178067414107728960487231565332= 4800 / + * 197379 + * =3D~ -5232195173029052432817285601415452880707052369324357280426.6 + * n =3D round(q, float32, nearest_even) + * =3D -5232194943010009439437691768433469154159343131709361094656 + * n / 2^192 =3D -6992213 / 8388608 + * r_precise =3D a - b * n =3D 13115851209189604982784 + * r =3D round(r_precise, float32, nearest_even) =3D r_precise + */ + err +=3D test_diebr(0x7070ffff, 0x90909090, 0, 0, + 0x6431c0c0, 0xbf5562aa, 3, 0, 0); + + /* + * Test large, but representable quotient. + * + * a =3D -12040119 / 549755813888 + * b =3D 1 / 38685626227668133590597632 + * q =3D a / b =3D -847248053779631702016 + * n =3D round(q, float32, to_odd) =3D q + * r_precise =3D a - b * n =3D -0 + * r =3D round(r_precise, float32, nearest_even) =3D -0 + */ + err +=3D test_diebr(0xb7b7b7b7, 0x15000000, 7, 0, + 0x80000000, 0xe237b7b7, 0, 0, 0); + + /* 0 / 0 */ + err +=3D test_diebr(0, 0, 1, 0, + 0x7fc00000, 0x7fc00000, 1, 0x800000, 0); + + /* 4.3E-33 / -2.08E-8 with SIGFPE */ + err +=3D test_diebr(0x09b2b2b2, 0xb2b2b2b2, 0, 0xfc000007, + 0xb2b2b2b1, 0xbf800000, 0, 0xfc000807, SIGFPE); + + /* + * Test tiny remainder scaling when FPC Underflow Mask is set. + * + * 1.19E-39 / -1.28E-9 =3D { r =3D 1.19E-39 * 2^192, n =3D -0 } + */ + err +=3D test_diebr(0x000d0100, 0xb0b0b0b0, 6, 0xfc000000, + 0x5ed01000, 0x80000000, 0, 0xfc001000, SIGFPE); + + /* + * Test "inexact and incremented" DXC. + * + * a =3D 53555504 + * b =3D -520849213389117849600 + * q =3D a / b =3D -3347219 / 32553075836819865600 + * n =3D round(q, float32, to_odd) =3D -1 + * r_precise =3D a - b * n =3D -520849213389064294096 + * r =3D round(r_precise, float32, to_odd) =3D -520849213389117849600 + * abs(r) - abs(r_precise) =3D 53555504 + */ + err +=3D test_diebr(0x4c4c4c4c, 0xe1e1e1e1, 0, 0xfc000007, + 0xe1e1e1e1, 0xbf800000, 0, 0xfc000c07, SIGFPE); + + /* 0 / 0 with SIGFPE */ + err +=3D test_diebr(0, 0, 0, 0xfc000007, + 0, 0x12345678, 0, 0xfc008007, SIGFPE); + + /* 5.76E-16 / 5.39E+34 */ + err +=3D test_diebr(0x26262626, 0x79262626, 6, 0, + 0xf9262626, 0x3f800000, 0, 0x80000, 0); + + /* -4.97E+17 / 2.03E-38 */ + err +=3D test_diebr(0xdcdcdcdc, 0x00dcdcdc, 7, 0xfc000000, + 0x80000000, 0xbb800000, 1, 0xfc000000, 0); + + /* -1.23E+17 / SNaN */ + err +=3D test_diebr(0xdbdb240b, 0xffac73ff, 4, 0, + 0xffec73ff, 0xffec73ff, 1, 0x800000, 0); + + /* 2.34E-38 / 3.27E-33 with SIGFPE */ + err +=3D test_diebr(0x00ff0987, 0x0987c6f6, 6, 0x08000000, + 0x8987c6b6, 0x3f800000, 0, 0x8000800, SIGFPE); + + /* -5.93E+11 / -2.7E+4 */ + err +=3D test_diebr(0xd30a0040, 0xc6d30a00, 0, 0xc4000000, + 0xc74a4400, 0x4ba766c6, 2, 0xc4000000, 0); + + /* 9.86E-32 / -inf */ + err +=3D test_diebr(0x0c000029, 0xff800000, 0, 0, + 0xc000029, 0x80000000, 0, 0, 0); + + /* QNaN / SNaN */ + err +=3D test_diebr(0xffff94ff, 0xff94ff24, 4, 7, + 0xffd4ff24, 0xffd4ff24, 1, 0x800007, 0); + + /* 2.8E-43 / -inf */ + err +=3D test_diebr(0x000000c8, 0xff800000, 0, 0x7c000007, + 0x000000c8, 0x80000000, 0, 0x7c000007, 0); + + /* -1.7E+38 / -inf */ + err +=3D test_diebr(0xff00003d, 0xff800000, 0, 0, + 0xff00003d, 0, 0, 0, 0); + + /* 1.94E-304 / 1.94E-304 */ + err +=3D test_didbr(0x00e100e100e100e1, 0x00e100e100e100e1, 0, 1, + 0, 0x3ff0000000000000, 0, 1, 0); + + /* 4.82E-299 / 5.29E-308 */ + err +=3D test_didbr(0x0200230200230200, 0x0023020023020023, 0, 0, + 0x8001a017d247b3f4, 0x41cb2aa05f000000, 0, 0, 0); + + /* -1.38E-75 / -3.77E+208 */ + err +=3D test_didbr(0xb063eb3d63b063eb, 0xeb3d63b063eb3d63, 3, 0xe8000= 000, + 0x6b3d63b063eb3d63, 0x3ff0000000000000, 0, 0xe8000c0= 0, + SIGFPE); + + /* 4.78E-299 / 6.88E-315 */ + err +=3D test_didbr(0x0200000000000000, 0x0000000053020000, 0, 0, + 0x8000000020820000, 0x4338ac20dd47c6c1, 0, 0, 0); + + return err ? EXIT_FAILURE : EXIT_SUCCESS; +} --=20 2.52.0