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([191.202.238.10]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-21c2ceba56asm81121865ad.98.2025.01.21.10.48.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 21 Jan 2025 10:48:55 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ventanamicro.com; s=google; t=1737485337; x=1738090137; 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=jwNZlRoqWyY0SU1aH3L8QCTZcSYByfezJsd2zpb077c=; b=NkmqG7FytJyuq5TqE22RQpo7umxkpjAluo4Xlx5rvMaVaFARAKNxLyYxN80o8gobsO HojZLV5/aDOZp2tUj1maUHZ/UXhXjPJsrGZznMxv7DYG8UFVQ+OpAu5Txa9UF19RvBaY LGo0NEcYt+wJktfBk/pBpw9xEecW8a4e8CwJaM7i4t9WciVoR33DRAfjqNS3Ne8vL6pN HAhSAKP8XlH0Tp8f4i++PEogSMPiqlcmv/19bXPM55Os6AWaTBAfOTUSGGFSuhvTfAae k64l/XDQPv1vdLw634zbLZAvUYqM3BrkykqL1v21NTIvqSquzGIlQRzZJN7KTyJ4n4gw 7Ftw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1737485337; x=1738090137; 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=jwNZlRoqWyY0SU1aH3L8QCTZcSYByfezJsd2zpb077c=; b=p2/4/X4M88g49GrcPISO/5asJGrQ5z2+UYOz7WXH69XzntcEQPNn357Q/Uh1PCkZu1 x1CnCQsts4cO4Nkmb6HgP+cSb+f7+RM0sEbY19Pzk9MGP5heFIuFZKaTDlUD9hAvjyot LZVPTIr14PCap3futtsEQ5T0kv7QWhXL0YSlsKhSFlLGkYN8RaoxzEmzbBMiajLT4duN 67mDAAF9TUxsSS5XvkLw+WuRHp5ygljk5bBDhbQSl02OkeQEl5xiAPi7l4gT7a+1oV0+ Sp2SMEyYP9V1WFFVy3Cj0TL/s/v8MQbQqY0/ab2z5NAVgqyL1S6RfDv/PKZwSeQ+D2Cx 6uOg== X-Gm-Message-State: AOJu0Yy/BaOayu6QhgzSZb4oD8Yp+OpAoCtou+tzt2XuAalPiwhSNuZn YBg15iPhvMTvTBuFFs+2DXlo0ZYeTv983Y6ZuNgAtrowsoZryFeWfYqvDOGEB+6j5y6vpklQMf3 I X-Gm-Gg: ASbGncu+lVKjNDY/gz9+LgjG+q/yH5S7kmI6A7Oefa0C9bzGDsUFozpjJYYju/9QuNy TMIlqdCQTaxVoMgrDmanPvgGw7uCxTrvg/ZgYQ9PUI1zsxvYIg6dCZqgS5JPHk3c39wWabLWG5X bHPiLitgDv0BquPqmA1N7rYdsv3EksMwGOllcq7UdcPQ9107aeZX7qSpTw0QFJwuJCTN9NIeDDt OBLswK/PlEyIoZ2CSgraWVJXQTWh1NnPXIzD8U0btMDa89UHYIw4xj59kZsDLfSint3eTF1 X-Google-Smtp-Source: AGHT+IES+x/bOnHhe+f7tnLZ4Vm12kVcBrWDBsxY62avdwz7s7sHRLU2wB1OQTetrXulnmxObeO32A== X-Received: by 2002:a17:902:d511:b0:215:75ca:6a0 with SMTP id d9443c01a7336-21c3555b09emr318630425ad.29.1737485335959; Tue, 21 Jan 2025 10:48:55 -0800 (PST) From: Daniel Henrique Barboza To: qemu-devel@nongnu.org Cc: qemu-riscv@nongnu.org, alistair.francis@wdc.com, bmeng@tinylab.org, liwei1518@gmail.com, zhiwei_liu@linux.alibaba.com, palmer@rivosinc.com, peter.maydell@linaro.org, Daniel Henrique Barboza Subject: [PATCH 1/5] target/riscv/csr.c: fix deadcode in rmw_xireg() Date: Tue, 21 Jan 2025 15:48:43 -0300 Message-ID: <20250121184847.2109128-2-dbarboza@ventanamicro.com> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20250121184847.2109128-1-dbarboza@ventanamicro.com> References: <20250121184847.2109128-1-dbarboza@ventanamicro.com> MIME-Version: 1.0 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::62e; envelope-from=dbarboza@ventanamicro.com; helo=mail-pl1-x62e.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: 2.1.29 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 @ventanamicro.com) X-ZM-MESSAGEID: 1737485357551019000 Content-Type: text/plain; charset="utf-8" Coverity found a DEADCODE issue in rmw_xireg() claiming that we can't reach 'RISCV_EXCP_VIRT_INSTRUCTION_FAULT' at the 'done' label: done: if (ret) { return (env->virt_enabled && virt) ? RISCV_EXCP_VIRT_INSTRUCTION_FAULT : RISCV_EXCP_ILLEGAL_INST; } return RISCV_EXCP_NONE; This happens because the 'virt' flag, which is only used by 'done', is set to 'false' and it will always remain 'false' in any condition where we'll jump to 'done': switch (csrno) { (...) case CSR_VSIREG: isel =3D env->vsiselect; virt =3D true; break; default: goto done; }; 'virt =3D true' will never reach 'done' because we have a if/else-if/else block right before the label that will always return: if (xiselect_aia_range(isel)) { return ... } else if (...) { return ... } else { return RISCV_EXCP_ILLEGAL_INST; } All this means that we can preserve the current logic by reducing the 'done' label to: done: if (ret) { return RISCV_EXCP_ILLEGAL_INST; } return RISCV_EXCP_NONE; The flag 'virt' is now unused. Remove it. Fix the 'goto done' identation while we're at it. Resolves: Coverity CID 1590359 Fixes: dc0280723d ("target/riscv: Decouple AIA processing from xiselect and= xireg") Signed-off-by: Daniel Henrique Barboza Reviewed-by: Alistair Francis --- target/riscv/csr.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/target/riscv/csr.c b/target/riscv/csr.c index afb7544f07..ab209d0cda 100644 --- a/target/riscv/csr.c +++ b/target/riscv/csr.c @@ -2658,7 +2658,6 @@ static RISCVException rmw_xireg(CPURISCVState *env, i= nt csrno, target_ulong *val, target_ulong new_val, target_ulong wr_mask) { - bool virt =3D false; int ret =3D -EINVAL; target_ulong isel; =20 @@ -2680,10 +2679,9 @@ static RISCVException rmw_xireg(CPURISCVState *env, = int csrno, break; case CSR_VSIREG: isel =3D env->vsiselect; - virt =3D true; break; default: - goto done; + goto done; }; =20 /* @@ -2705,8 +2703,7 @@ static RISCVException rmw_xireg(CPURISCVState *env, i= nt csrno, =20 done: if (ret) { - return (env->virt_enabled && virt) ? - RISCV_EXCP_VIRT_INSTRUCTION_FAULT : RISCV_EXCP_ILLEGAL_INST; + return RISCV_EXCP_ILLEGAL_INST; } return RISCV_EXCP_NONE; } --=20 2.47.1