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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists1p.gnu.org; Received-SPF: pass client-ip=148.163.156.1; envelope-from=iii@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, 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: 1784061196998158500 Content-Type: text/plain; charset="utf-8" STORE CLOCK [FAST] to an inaccessible address aborts QEMU: $ qemu-s390x ./stckf ERROR:cc_helper.c:128:cc_calc_addu: assertion failed: (carry_out <=3D 1) op_stck() sets the condition code with gen_op_movi_cc() before the output operand store, which is deferred to wout_m1_64(). Assigning a constant condition code discards the lazy CC values, so the optimizer drops the writes that produced them. When the store then raises an exception, the instruction is suppressed and s390x_restore_state_to_opc() reinstates the cc_op recorded at the start of STCK[F], but cc_src/cc_dst now hold stale values, so the next condition code evaluation reads garbage. Fix by performing the store manually. The alternative of not discarding in gen_op_movi_cc() keeps the inputs live, but results in less optimal code. Reported-by: Ido Plat Fixes: 434c91a5f4ed ("target-s390: Convert STCK") Cc: qemu-stable@nongnu.org Signed-off-by: Ilya Leoshkevich --- target/s390x/tcg/insn-data.h.inc | 4 ++-- target/s390x/tcg/translate.c | 2 ++ 2 files changed, 4 insertions(+), 2 deletions(-) diff --git a/target/s390x/tcg/insn-data.h.inc b/target/s390x/tcg/insn-data.= h.inc index 0d5392eac54..1ea72248a6a 100644 --- a/target/s390x/tcg/insn-data.h.inc +++ b/target/s390x/tcg/insn-data.h.inc @@ -887,8 +887,8 @@ C(0xe32f, STRVG, RXY_a, Z, la2, r1_o, new, m1_64, rev64, 0) =20 /* STORE CLOCK */ - F(0xb205, STCK, S, Z, la2, 0, new, m1_64, stck, 0, IF_IO) - F(0xb27c, STCKF, S, SCF, la2, 0, new, m1_64, stck, 0, IF_IO) + F(0xb205, STCK, S, Z, la2, 0, new, 0, stck, 0, IF_IO) + F(0xb27c, STCKF, S, SCF, la2, 0, new, 0, stck, 0, IF_IO) /* STORE CLOCK EXTENDED */ F(0xb278, STCKE, S, Z, 0, a2, 0, 0, stcke, 0, IF_IO) =20 diff --git a/target/s390x/tcg/translate.c b/target/s390x/tcg/translate.c index 82165ac1ec0..1b6023168bb 100644 --- a/target/s390x/tcg/translate.c +++ b/target/s390x/tcg/translate.c @@ -4108,7 +4108,9 @@ static DisasJumpType op_stap(DisasContext *s, DisasOp= s *o) static DisasJumpType op_stck(DisasContext *s, DisasOps *o) { gen_helper_stck(o->out, tcg_env); + tcg_gen_qemu_st_i64(o->out, o->addr1, get_mem_index(s), MO_BEUQ); /* ??? We don't implement clock states. */ + /* Set the CC after the store; a suppressed store must preserve it. */ gen_op_movi_cc(s, 0); return DISAS_NEXT; } --=20 2.55.0 From nobody Sat Jul 25 18:53:58 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=reject dis=none) header.from=linux.ibm.com ARC-Seal: i=1; a=rsa-sha256; t=1784061195; cv=none; d=zohomail.com; s=zohoarc; b=gRF/3TDccUVYHQJjZoiJqrtlfyV3Dz7JI2MAzoAKKfyT4ATZMsZiwAHemwliSgvMiEsYwLgSGf9T91lT319nAJMOyybdoq6JTgqZ1RYH0hEhuuETyoi8fBC0N7+aj+sgDGA8URr+Fy2dhXutoZ879InwJ3g/Y5DXAjjlIOzPhC4= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1784061195; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists1p.gnu.org; Received-SPF: pass client-ip=148.163.156.1; envelope-from=iii@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, 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: 1784061196985158500 Content-Type: text/plain; charset="utf-8" Add a small test to prevent regressions. Signed-off-by: Ilya Leoshkevich --- tests/tcg/s390x/Makefile.target | 1 + tests/tcg/s390x/stckf.c | 44 +++++++++++++++++++++++++++++++++ 2 files changed, 45 insertions(+) create mode 100644 tests/tcg/s390x/stckf.c diff --git a/tests/tcg/s390x/Makefile.target b/tests/tcg/s390x/Makefile.tar= get index 0ca030ded01..6a5bf8b7813 100644 --- a/tests/tcg/s390x/Makefile.target +++ b/tests/tcg/s390x/Makefile.target @@ -50,6 +50,7 @@ TESTS+=3Dcvb TESTS+=3Dts TESTS+=3Dex-smc TESTS+=3Ddivide-to-integer +TESTS+=3Dstckf =20 cdsg: CFLAGS+=3D-pthread cdsg: LDFLAGS+=3D-pthread diff --git a/tests/tcg/s390x/stckf.c b/tests/tcg/s390x/stckf.c new file mode 100644 index 00000000000..51c8c9df9f8 --- /dev/null +++ b/tests/tcg/s390x/stckf.c @@ -0,0 +1,44 @@ +/* + * Test that a faulting STORE CLOCK FAST does not clobber the condition co= de. + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ +#include +#include +#include +#include + +static void handle_sigsegv(int sig, siginfo_t *info, void *ucontext) +{ + mcontext_t *mcontext =3D &((ucontext_t *)ucontext)->uc_mcontext; + + /* The condition code must be the one set by SLGR, not garbage. */ + _exit(((mcontext->psw.mask >> 44) & 3) =3D=3D 3 ? EXIT_SUCCESS : EXIT_= FAILURE); +} + +int main(void) +{ + struct sigaction act =3D { + .sa_sigaction =3D handle_sigsegv, + .sa_flags =3D SA_SIGINFO, + }; + int err; + + err =3D sigaction(SIGSEGV, &act, NULL); + assert(err =3D=3D 0); + + asm volatile( + "lghi %%r1,100\n" + "lghi %%r2,0\n" + "clgr %%r1,%%r2\n" /* CC_OP_LTUGTU_64 */ + /* cc_src=3D100 is not valid for CC_OP_SUBU */ + "ipm %%r0\n" /* force cc_src to env */ + "lghi %%r3,5\n" + "lghi %%r4,3\n" + "slgr %%r3,%%r4\n" /* CC_OP_SUBU, cc=3D3 */ + "lghi %%r5,0\n" + "stckf 0(%%r5)\n" /* faults; cc must stay 3 */ + : : : "r0", "r1", "r2", "r3", "r4", "r5", "cc", "memory"); + + return EXIT_FAILURE; +} --=20 2.55.0