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(unknown [223.64.120.81]) by front1 (Coremail) with SMTP id qMiowMAxj8XGvfxnsL6AAA--.55749S2; Mon, 14 Apr 2025 15:48:27 +0800 (CST) From: WANG Rui To: Gao Song Cc: qemu-devel@nongnu.org, qemu@hev.cc, WANG Rui Subject: [PATCH] linux-user/loongarch64: Decode BRK break codes for FPE signals Date: Mon, 14 Apr 2025 15:49:52 +0800 Message-ID: <20250414074952.6253-1-wangrui@loongson.cn> X-Mailer: git-send-email 2.49.0 MIME-Version: 1.0 X-CM-TRANSID: qMiowMAxj8XGvfxnsL6AAA--.55749S2 X-CM-SenderInfo: pzdqw2txl6z05rqj20fqof0/ X-Coremail-Antispam: 1Uk129KBj93XoWxJr43uF45Gw1rCrWrur4fCrX_yoW8AFWfpF ykur1xCryUGry7twnxJ34kZF45uFs29r47Gryaka18J3yxJr1Uuw1q9Fsxua45JrW7ury7 ZryUJwnruF1UAagCm3ZEXasCq-sJn29KB7ZKAUJUUUU8529EdanIXcx71UUUUU7KY7ZEXa sCq-sGcSsGvfJ3Ic02F40EFcxC0VAKzVAqx4xG6I80ebIjqfuFe4nvWSU5nxnvy29KBjDU 0xBIdaVrnRJUUUk0b4IE77IF4wAFF20E14v26r1j6r4UM7CY07I20VC2zVCF04k26cxKx2 IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48v e4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_Ar0_tr1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI 0_Gr0_Cr1l84ACjcxK6I8E87Iv67AKxVWxJr0_GcWl84ACjcxK6I8E87Iv6xkF7I0E14v2 6F4UJVW0owAS0I0E0xvYzxvE52x082IY62kv0487Mc804VCY07AIYIkI8VC2zVCFFI0UMc 02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0I7IYx2IY67AKxVWUGVWUXwAv7VC2z280aVAF wI0_Jr0_Gr1lOx8S6xCaFVCjc4AY6r1j6r4UM4x0Y48IcxkI7VAKI48JMxAIw28IcxkI7V AKI48JMxC20s026xCaFVCjc4AY6r1j6r4UMI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCj r7xvwVAFwI0_JrI_JrWlx4CE17CEb7AF67AKxVWUAVWUtwCIc40Y0x0EwIxGrwCI42IY6x IIjxv20xvE14v26r1j6r1xMIIF0xvE2Ix0cI8IcVCY1x0267AKxVWUJVW8JwCI42IY6xAI w20EY4v20xvaj40_Jr0_JF4lIxAIcVC2z280aVAFwI0_Jr0_Gr1lIxAIcVC2z280aVCY1x 0267AKxVWUJVW8JbIYCTnIWIevJa73UjIFyTuYvjxUrNtxDUUUU Received-SPF: pass client-ip=114.242.206.163; envelope-from=wangrui@loongson.cn; helo=mail.loongson.cn X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, 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: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Handle specific LoongArch BRK break codes in user-mode emulation to deliver accurate floating-point exception signals. Specifically, BRK_OVERFLOW (6) triggers TARGET_FPE_INTOVF, and BRK_DIVZERO (7) triggers TARGET_FPE_INTDIV. Other BRK codes fall back to a generic SIGTRAP. This improves correctness for programs that rely on BRK to signal overflow or divide-by-zero conditions. Signed-off-by: WANG Rui --- linux-user/loongarch64/cpu_loop.c | 25 ++++++++++++++++++++++++- 1 file changed, 24 insertions(+), 1 deletion(-) diff --git a/linux-user/loongarch64/cpu_loop.c b/linux-user/loongarch64/cpu_loop.c index 0614d3de22..ec8a06c88c 100644 --- a/linux-user/loongarch64/cpu_loop.c +++ b/linux-user/loongarch64/cpu_loop.c @@ -11,6 +11,12 @@ #include "user/cpu_loop.h" #include "signal-common.h" +/* Break codes */ +enum { + BRK_OVERFLOW = 6, + BRK_DIVZERO = 7 +}; + void cpu_loop(CPULoongArchState *env) { CPUState *cs = env_cpu(env); @@ -66,9 +72,26 @@ void cpu_loop(CPULoongArchState *env) force_sig_fault(TARGET_SIGFPE, si_code, env->pc); break; case EXCP_DEBUG: - case EXCCODE_BRK: force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc); break; + case EXCCODE_BRK: + { + unsigned int opcode; + + get_user_u32(opcode, env->pc); + + switch (opcode & 0x7fff) { + case BRK_OVERFLOW: + force_sig_fault(TARGET_SIGFPE, TARGET_FPE_INTOVF, env->pc); + break; + case BRK_DIVZERO: + force_sig_fault(TARGET_SIGFPE, TARGET_FPE_INTDIV, env->pc); + break; + default: + force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc); + } + } + break; case EXCCODE_BCE: force_sig_fault(TARGET_SIGSYS, TARGET_SI_KERNEL, env->pc); break;