From patchwork Sat Aug 24 04:56:20 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ajeet Singh X-Patchwork-Id: 13776305 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 00CB0C54731 for ; Sat, 24 Aug 2024 04:58:16 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1shipd-00068J-EE; Sat, 24 Aug 2024 00:56:57 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1shipb-000622-M9 for qemu-devel@nongnu.org; Sat, 24 Aug 2024 00:56:55 -0400 Received: from mail-oo1-xc2d.google.com ([2607:f8b0:4864:20::c2d]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1shipa-0002EX-3L for qemu-devel@nongnu.org; Sat, 24 Aug 2024 00:56:55 -0400 Received: by mail-oo1-xc2d.google.com with SMTP id 006d021491bc7-5d5b850d969so1918308eaf.0 for ; Fri, 23 Aug 2024 21:56:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1724475412; x=1725080212; 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=WHayX5ojJN5/ahyBORPFkIjjx3JTNZK/Yv3Y1gMyMGw=; b=A6KqbVz3xd253HtSiKjauQyqZg0MlX1r8y4IOFsNPqc8l+LGO6vYfhsLpJuqU3+qio jdOofypMsHPXg96kWAVtkEu0UOnQPKdM75h4M8W03a6UueAWbymlMKryX/yEX9gleopT 853zj/ynVfXvMX0PpsKJ5P11z7kKqvmwCRAIKmIDFZi9FNt0Fmz5t2Dg+0I+5WjLBtyQ bv7estiAj7WSVOpx2l/o8njfwpaQ3ava/kaEemOxTbb6JA9LodCJmpoNJeuVR8JnErb7 y/nJ2oe27DM2ePbAsND40p5o8JFWt+bjEcFDr3JXBn+Re7f2oN3QwHe6BCfce/Sy/3j8 5G9Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1724475412; x=1725080212; 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=WHayX5ojJN5/ahyBORPFkIjjx3JTNZK/Yv3Y1gMyMGw=; b=GbOBoUJeNt3D9IELma0WDdVl6Y+jRASmusZS6BzmmNn+Jf+UTN0wUFerofIXuHJMs4 uOQvQGfWqZAIREo7B6+/hcW6qrfB8TdwFGrPXb/1UUdqTlEuLGeeT0QpQiPA78ROlTKL iJdXphsQbZMPdq70Yj4c2kJ8h+waPgyZidCDG110fkHITdjIZQzzwfNbFBxcavm3eXwg O0Wq56QVDp2QwoQCit+4NfC02AGPDNnFEmoFCbJPdSpqls4Vwk1IvYqGHkeubnDTBm2l Y937EooGveA900YD0RwSPtyoTeptN574OtjfuoWi6si566+PV08Fb3dYP3wLnJWdzYGp E3Hw== X-Gm-Message-State: AOJu0YxR8kGby8qsPSTxDzKo9TT07HXmKdHNyNmTv9IK233MCfuwLgMO egM/gNaU7jNWBQdomsl0/pnLRIu+pt5gLtyY3T+1NOdSJopZQ6NooqMUbg+2PSU= X-Google-Smtp-Source: AGHT+IEj/RAL1erF/4+uqPWjU2yLO6irBlqlEoQ5ZAXbSfyCVtKoaGRngg+60On/7cgTQLpatj7C6A== X-Received: by 2002:a05:6358:948f:b0:1a6:799b:b06c with SMTP id e5c5f4694b2df-1b5c21ede3amr580932055d.23.1724475412244; Fri, 23 Aug 2024 21:56:52 -0700 (PDT) Received: from localhost.localdomain ([220.253.126.131]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7143422ecedsm3805934b3a.25.2024.08.23.21.56.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 23 Aug 2024 21:56:51 -0700 (PDT) From: Ajeet Singh X-Google-Original-From: Ajeet Singh To: qemu-devel@nongnu.org Cc: Warner Losh , Mark Corbin , Ajeet Singh , Jessica Clarke , Kyle Evans , Richard Henderson Subject: [PATCH v3 02/17] bsd-user: Add RISC-V CPU execution loop and syscall handling Date: Sat, 24 Aug 2024 14:56:20 +1000 Message-Id: <20240824045635.8978-3-itachis@FreeBSD.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240824045635.8978-1-itachis@FreeBSD.org> References: <20240824045635.8978-1-itachis@FreeBSD.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::c2d; envelope-from=itachis6234@gmail.com; helo=mail-oo1-xc2d.google.com 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, 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, T_SCC_BODY_TEXT_LINE=-0.01 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 From: Mark Corbin Implemented the RISC-V CPU execution loop, including handling various exceptions and system calls. The loop continuously executes CPU instructions,processes exceptions, and handles system calls by invoking FreeBSD syscall handlers. Signed-off-by: Mark Corbin Signed-off-by: Ajeet Singh Co-authored-by: Jessica Clarke Co-authored-by: Kyle Evans Reviewed-by: Richard Henderson --- bsd-user/riscv/target_arch_cpu.h | 94 ++++++++++++++++++++++++++++++++ 1 file changed, 94 insertions(+) diff --git a/bsd-user/riscv/target_arch_cpu.h b/bsd-user/riscv/target_arch_cpu.h index e17c910ae9..eb37b062a3 100644 --- a/bsd-user/riscv/target_arch_cpu.h +++ b/bsd-user/riscv/target_arch_cpu.h @@ -36,4 +36,98 @@ static inline void target_cpu_init(CPURISCVState *env, env->pc = regs->sepc; } +static inline void target_cpu_loop(CPURISCVState *env) +{ + CPUState *cs = env_cpu(env); + int trapnr; + abi_long ret; + unsigned int syscall_num; + int32_t signo, code; + + for (;;) { + cpu_exec_start(cs); + trapnr = cpu_exec(cs); + cpu_exec_end(cs); + process_queued_cpu_work(cs); + + signo = 0; + + switch (trapnr) { + case EXCP_INTERRUPT: + /* just indicate that signals should be handled asap */ + break; + case EXCP_ATOMIC: + cpu_exec_step_atomic(cs); + break; + case RISCV_EXCP_U_ECALL: + syscall_num = env->gpr[xT0]; /* t0 */ + env->pc += TARGET_INSN_SIZE; + /* Compare to cpu_fetch_syscall_args() in riscv/riscv/trap.c */ + if (TARGET_FREEBSD_NR___syscall == syscall_num || + TARGET_FREEBSD_NR_syscall == syscall_num) { + ret = do_freebsd_syscall(env, + env->gpr[xA0], /* a0 */ + env->gpr[xA1], /* a1 */ + env->gpr[xA2], /* a2 */ + env->gpr[xA3], /* a3 */ + env->gpr[xA4], /* a4 */ + env->gpr[xA5], /* a5 */ + env->gpr[xA6], /* a6 */ + env->gpr[xA7], /* a7 */ + 0); + } else { + ret = do_freebsd_syscall(env, + syscall_num, + env->gpr[xA0], /* a0 */ + env->gpr[xA1], /* a1 */ + env->gpr[xA2], /* a2 */ + env->gpr[xA3], /* a3 */ + env->gpr[xA4], /* a4 */ + env->gpr[xA5], /* a5 */ + env->gpr[xA6], /* a6 */ + env->gpr[xA7] /* a7 */ + ); + } + + /* + * Compare to cpu_set_syscall_retval() in + * riscv/riscv/vm_machdep.c + */ + if (ret >= 0) { + env->gpr[xA0] = ret; /* a0 */ + env->gpr[xT0] = 0; /* t0 */ + } else if (ret == -TARGET_ERESTART) { + env->pc -= TARGET_INSN_SIZE; + } else if (ret != -TARGET_EJUSTRETURN) { + env->gpr[xA0] = -ret; /* a0 */ + env->gpr[xT0] = 1; /* t0 */ + } + break; + case RISCV_EXCP_ILLEGAL_INST: + signo = TARGET_SIGILL; + code = TARGET_ILL_ILLOPC; + break; + case RISCV_EXCP_BREAKPOINT: + signo = TARGET_SIGTRAP; + code = TARGET_TRAP_BRKPT; + break; + case EXCP_DEBUG: + signo = TARGET_SIGTRAP; + code = TARGET_TRAP_BRKPT; + break; + default: + fprintf(stderr, "qemu: unhandled CPU exception " + "0x%x - aborting\n", trapnr); + cpu_dump_state(cs, stderr, 0); + abort(); + } + + if (signo) { + force_sig_fault(signo, code, env->pc); + } + + process_pending_signals(env); + } +} + #endif /* TARGET_ARCH_CPU_H */