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[27.32.110.191]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-207946046cbsm37482545ad.105.2024.09.16.08.51.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 16 Sep 2024 08:51:38 -0700 (PDT) From: Ajeet Singh X-Google-Original-From: Ajeet Singh To: qemu-devel@nongnu.org Cc: Alistair Francis , Mark Corbin , qemu-riscv@nongnu.org, Warner Losh , Daniel Henrique Barboza , Ajeet Singh , Jessica Clarke , Kyle Evans , Richard Henderson Subject: [PATCH v7 02/17] bsd-user: Add RISC-V CPU execution loop and syscall handling Date: Tue, 17 Sep 2024 01:51:04 +1000 Message-Id: <20240916155119.14610-3-itachis@FreeBSD.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240916155119.14610-1-itachis@FreeBSD.org> References: <20240916155119.14610-1-itachis@FreeBSD.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::633; envelope-from=itachis6234@gmail.com; helo=mail-pl1-x633.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+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 f8d85e01ad..9c31d9dc4c 100644 --- a/bsd-user/riscv/target_arch_cpu.h +++ b/bsd-user/riscv/target_arch_cpu.h @@ -37,4 +37,98 @@ 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]; + 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], + env->gpr[xA1], + env->gpr[xA2], + env->gpr[xA3], + env->gpr[xA4], + env->gpr[xA5], + env->gpr[xA6], + env->gpr[xA7], + 0); + } else { + ret = do_freebsd_syscall(env, + syscall_num, + env->gpr[xA0], + env->gpr[xA1], + env->gpr[xA2], + env->gpr[xA3], + env->gpr[xA4], + env->gpr[xA5], + env->gpr[xA6], + env->gpr[xA7] + ); + } + + /* + * Compare to cpu_set_syscall_retval() in + * riscv/riscv/vm_machdep.c + */ + if (ret >= 0) { + env->gpr[xA0] = ret; + env->gpr[xT0] = 0; + } else if (ret == -TARGET_ERESTART) { + env->pc -= TARGET_INSN_SIZE; + } else if (ret != -TARGET_EJUSTRETURN) { + env->gpr[xA0] = -ret; + env->gpr[xT0] = 1; + } + 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 */