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c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1785786001; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type; bh=jhxxe5YH1XoA2W6fjeD0OvEICcTahHqGGvfqyuhxkLY=; b=TnYLPrJqMJU0lWpmjvY0t7xxJJHhhVxOvPdb05cQI9Dx04C17VMd9EKyaCUyCZIZryMFjY KxeBoQ/8pX1Mz3WiLrqF7pKT33kBGbVmzDk29bz1sgAud9FKHNEZGFMG5Of/gMZiec2/kQ LeBbUQ+r1mq8KpBejJfybLsKQL2Iplc= X-MC-Unique: IZ0K9hK0P_2UVrn5Jod7GA-1 X-Mimecast-MFC-AGG-ID: IZ0K9hK0P_2UVrn5Jod7GA_1785785920 Date: Mon, 3 Aug 2026 21:38:32 +0200 (CEST) From: Mikulas Patocka To: Yoshinori Sato , Richard Henderson cc: qemu-devel@nongnu.org Subject: [PATCH] linux-user/sh4: Fix crashes on signal delivery in conditional delay slot Message-ID: <99f60fb8-e9db-e775-38db-44df9514a4c7@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists1p.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=mpatocka@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: 4 X-Spam_score: 0.4 X-Spam_bar: / X-Spam_report: (0.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.811, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.01, RCVD_IN_SBL_CSS=3.335, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=no 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 @redhat.com) X-ZM-MESSAGEID: 1785786037405158500 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" If we get a signal in the delay slot, we must roll-back the PC to the jump instruction. This was already fixed by the commit 3b894b699c9a ("linux-user/sh4: Fix crashes on signal delivery"), however this fix omits a test for TB_FLAG_DELAY_SLOT_COND. TB_FLAG_DELAY_SLOT_COND is set by the conditional delayed branches bf/s and bt/s. Qemu did not roll-back the PC in this case, resulting in incorrect program execution. This patch fixes it. Cc: qemu-stable@nongnu.org Signed-off-by: Mikulas Patocka Reviewed-by: Yoshinori Sato --- linux-user/sh4/signal.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) Index: qemu/linux-user/sh4/signal.c =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D --- qemu.orig/linux-user/sh4/signal.c 2026-08-02 18:02:30.000000000 +0200 +++ qemu/linux-user/sh4/signal.c 2026-08-02 18:03:09.000000000 +0200 @@ -109,7 +109,7 @@ static void unwind_gusa(CPUSH4State *reg the SP, otherwise we would be pushing the signal context to invalid memory. */ regs->gregs[15] =3D regs->gregs[1]; - } else if (regs->flags & TB_FLAG_DELAY_SLOT) { + } else if (regs->flags & (TB_FLAG_DELAY_SLOT | TB_FLAG_DELAY_SLOT_COND= )) { /* If we are in a delay slot, push the previous instruction. */ regs->pc -=3D 2; }