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[2403:580b:97e8:0:82ce:f179:8a79:69f4]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-231ecd5ea41sm41750035ad.228.2025.05.18.21.09.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 18 May 2025 21:09:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1747627750; x=1748232550; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=9+8m5dgUHffTrvncW6hBDGM/ivLaHuneNLED/QiZRAg=; b=f75CQJLz5+OjZSeeqJJeRkmRUQ+dp/L3kctCxmx7qyQWHl+1itMeY5QslMCEWY70xo HIP0wtTPkKIoFGFgz3Y3Uh+YjEGqoBubUyBAPmpcFP2KH8GJixUsNyjEG3wL/2GBm6mL 5ugUkMv2abGZi2hv4mMAo/lgpY2DyMZpF1TM2GKRMA9c017aTeMcKwcko07ZFWv/HHeT CtyGCopAUjIg/YKT+768RBdk/C9aFgx6FvmpnT74k6lwK1tmOKkqqh8+SAtPM0SUBNs4 7cK4rR0Y8kTxsnB07qlph4lNeZj1nG5FGb0FgO6K5uDAlVTnkjR7ImGWgdBslkKtsEKu tAFA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1747627750; x=1748232550; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=9+8m5dgUHffTrvncW6hBDGM/ivLaHuneNLED/QiZRAg=; b=VyybapadvmEu8arF3bXUsqaNySL1jHh0Mv4/RJg3CR/htB9M6UQr6crZ4vVV+zhoHf eW6lm2rjEiKS7tPWuuMkpdpXnNEXN+oEFXRX8FfywmFFETP6cMSOzx1h6R2NEKK4kLea e2l/GnTO23KNNtx7x1ryKDLzhzoSFL4lrZlKIDZMr0MPAgloCBaZzzvXCOXOPh+vDZT4 EnMo+3uHdapRFGx6HIKy/DAUVomM6ogc+oDoDu8IRwrcXyA2DprnKnS4yaUBg05WgjfR yqjE7F7FqRrB8CcBi6EYKm+904/iTJq0hV6gYpMvXvQWjSeoR1Mceu1k3u+u3cPd5F6E fhKg== X-Gm-Message-State: AOJu0YxGyB4m7A2tB/nSjn82Z7HzE56wClwJtcD7koX7YPXbsA8k5r63 ljcs8ocJ53j2pM5kYz36lzlPgo6Tfmsoz9fSX073g47b8j1C9AauFFloImDuZg== X-Gm-Gg: ASbGncsr3p/gy5x2bGA8ReKgHZWfseSs1hCvNmMNLHeZSjOjhn7OiaFkT4AMqwbkVd7 HPACNOgUS2RNciP/pyub8811eZUV4dQk/qTjRSqQmnIdTEzVHhEj8klwmNexYHo9hlwCeKAlB+p xDbt5eu9z6TIUKGbqqAwJy65hF2atZWNCTZR4ORiTHusO4k2VONFK3r2KxU8Tor1neHrsSSGVOx uAL+2/YQWl/n6SvBlEMQWm+4AcnWJV+yZMVCTatYg4PlmYdBxxH3c4ovhcFYagK0MgHH78+PlSe 4dKR/JZjqDVgEQZyIQRfOaaGOhmynqmQTWHcA+txrbk85ZZdnP1IGx7N45PgBAQAHz+c+B0mAEx 1wfcVN8K98b+3jahAZUZbQ8XDGUXfKgbuHdum3wXbQ9iezq9ch/BZkKyz X-Google-Smtp-Source: AGHT+IH9IW+xcFs2W1OGg3+FuV44wsEpcHuOoc6tY8aE9WOp7AoOJ8c4NPByYxXLbhFuPdl9l1zM1g== X-Received: by 2002:a17:903:3d0f:b0:220:faa2:c911 with SMTP id d9443c01a7336-231d44e8833mr163446435ad.14.1747627749827; Sun, 18 May 2025 21:09:09 -0700 (PDT) From: alistair23@gmail.com X-Google-Original-From: alistair.francis@wdc.com To: qemu-devel@nongnu.org Cc: alistair23@gmail.com, Richard Henderson , Alistair Francis , Daniel Henrique Barboza , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Subject: [PULL 38/56] target/riscv: Fix write_misa vs aligned next_pc Date: Mon, 19 May 2025 14:05:35 +1000 Message-ID: <20250519040555.3797167-39-alistair.francis@wdc.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250519040555.3797167-1-alistair.francis@wdc.com> References: <20250519040555.3797167-1-alistair.francis@wdc.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable 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=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::634; envelope-from=alistair23@gmail.com; helo=mail-pl1-x634.google.com X-Spam_score_int: -17 X-Spam_score: -1.8 X-Spam_bar: - X-Spam_report: (-1.8 / 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, FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, 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: 2.1.29 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-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1747628987189116600 From: Richard Henderson Do not examine a random host return address, but properly compute the next pc for the guest cpu. Fixes: f18637cd611 ("RISC-V: Add misa runtime write support") Signed-off-by: Richard Henderson Reviewed-by: Alistair Francis Reviewed-by: Daniel Henrique Barboza Reviewed-by: Philippe Mathieu-Daud=C3=A9 Message-ID: <20250425152311.804338-8-richard.henderson@linaro.org> [ Changes by AF: - Change `& ~3` to `& 3` ] Signed-off-by: Alistair Francis --- target/riscv/csr.c | 22 +++++++++++++++++----- 1 file changed, 17 insertions(+), 5 deletions(-) diff --git a/target/riscv/csr.c b/target/riscv/csr.c index 53458491da..288edeedea 100644 --- a/target/riscv/csr.c +++ b/target/riscv/csr.c @@ -30,6 +30,8 @@ #include "accel/tcg/getpc.h" #include "qemu/guest-random.h" #include "qapi/error.h" +#include "tcg/insn-start-words.h" +#include "internals.h" #include =20 /* CSR function table public API */ @@ -2099,6 +2101,19 @@ static RISCVException read_misa(CPURISCVState *env, = int csrno, return RISCV_EXCP_NONE; } =20 +static target_ulong get_next_pc(CPURISCVState *env, uintptr_t ra) +{ + uint64_t data[INSN_START_WORDS]; + + /* Outside of a running cpu, env contains the next pc. */ + if (ra =3D=3D 0 || !cpu_unwind_state_data(env_cpu(env), ra, data)) { + return env->pc; + } + + /* Within unwind data, [0] is pc and [1] is the opcode. */ + return data[0] + insn_len(data[1]); +} + static RISCVException write_misa(CPURISCVState *env, int csrno, target_ulong val, uintptr_t ra) { @@ -2114,11 +2129,8 @@ static RISCVException write_misa(CPURISCVState *env,= int csrno, /* Mask extensions that are not supported by this hart */ val &=3D env->misa_ext_mask; =20 - /* - * Suppress 'C' if next instruction is not aligned - * TODO: this should check next_pc - */ - if ((val & RVC) && (GETPC() & ~3) !=3D 0) { + /* Suppress 'C' if next instruction is not aligned. */ + if ((val & RVC) && (get_next_pc(env, ra) & 3) !=3D 0) { val &=3D ~RVC; } =20 --=20 2.49.0