From patchwork Wed Jul 24 22:04:34 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Warner Losh X-Patchwork-Id: 13741409 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 2078BC3DA63 for ; Wed, 24 Jul 2024 22:10:28 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sWk7v-0000HC-RD; Wed, 24 Jul 2024 18:06:27 -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 1sWk7t-0000A6-Rx for qemu-devel@nongnu.org; Wed, 24 Jul 2024 18:06:25 -0400 Received: from mail-io1-xd35.google.com ([2607:f8b0:4864:20::d35]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1sWk7o-0006RQ-3D for qemu-devel@nongnu.org; Wed, 24 Jul 2024 18:06:25 -0400 Received: by mail-io1-xd35.google.com with SMTP id ca18e2360f4ac-81477e9fd89so10703339f.0 for ; Wed, 24 Jul 2024 15:06:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bsdimp-com.20230601.gappssmtp.com; s=20230601; t=1721858777; x=1722463577; 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=9RgA/sQrSqu0rivwfkVX+vpcUdtyuMUfMJ/jiDAmIes=; b=PjL1+JtoOqmWBg4bOQLNtGvS9kFOZRCqd6ApWkleJf0+Gw8AP9t09GIlpm3HwmAhzE FB9nnNgba9OqXT0nBZq3O0Jqy7Y5cmwPLhb5REP/OoQA15fiBioJnrk5dTt2Mm6XpxjE CP2JMArQYnmsNCq/y0f7i1ZtL4xyWB84LpvYhVhimBrw2vUxxAm+PmXjhAKLX1di9FIy nYHK/r3AesDdfAllrWnf5YZXC5oGXOIbPPBjfBDVdBmm8nPTTtErjDRY+DW8Inrab0jo JBVRKxU6ozygfl+33jYMa8+4OoJVax//AjAye6n5LcKaVEF515A6/QdU63gq0qePLPuG T/nQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1721858777; x=1722463577; 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=9RgA/sQrSqu0rivwfkVX+vpcUdtyuMUfMJ/jiDAmIes=; b=S/6W9swnU/uqi/7w3EvF63RcwcQO1rIANYwd+oHMDbDAjHMBekS4NV8rPmGkjmZedn 9hCi0t8KyM1fdDuqeFOKMtMeGxJeYNciS2Un2ZleR+d877aqG3pWq30UxoKKpoxJ6WXn v7R3oiix3cBFfVQJ+20pgJHKUCcJNZ+G69z1NrKWaXOSbfHASesWzr2lA6rlX39DX2t6 7wYD+EOZm9jupQ8iuU5Rb25740BGJLMksfo2dvP/wkBe2taTDotXVc8nse1EaBVN4NQt mt+KzVB+aIo8qwTbUr3+SkseNRyrjqQhlqy8747M6CdXQUfQ62cJhIhZEOA2yFLq0v5K XgTw== X-Gm-Message-State: AOJu0Yz27EI/w/OnS8pkCEQnxtE3cSJZMZJoo8j5mO0ZzhDrXhHxXNRn jeF6mXnQUBrKzh9T6HOuActBjnqoolNjRkmwMgWw8IDpZhUzky3jTaBUnWeUcLEUi+Cem84jTe/ Xvpc= X-Google-Smtp-Source: AGHT+IGdwHlLAfkbdrQ91sKgktBmxpXZU84mIgqFZG38Cc0hlZjgd9TntmoCrsz9qAF4NWFnM+n2OA== X-Received: by 2002:a05:6602:6395:b0:7f8:c131:3bde with SMTP id ca18e2360f4ac-81f72f47f01mr239482839f.5.1721858777134; Wed, 24 Jul 2024 15:06:17 -0700 (PDT) Received: from dune.bsdimp.com ([50.253.99.174]) by smtp.gmail.com with ESMTPSA id 8926c6da1cb9f-4c29fa983f8sm10086173.47.2024.07.24.15.06.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 24 Jul 2024 15:06:16 -0700 (PDT) From: Warner Losh To: qemu-devel@nongnu.org Cc: Kyle Evans , qemu-arm@nongnu.org, Peter Maydell , Warner Losh , Stacey Son , Ajeet Singh , Sean Bruno , Jessica Clarke , Richard Henderson Subject: [PULL 01/15] bsd-user:Add CPU initialization and management functions Date: Wed, 24 Jul 2024 16:04:34 -0600 Message-ID: <20240724220449.10398-2-imp@bsdimp.com> X-Mailer: git-send-email 2.45.1 In-Reply-To: <20240724220449.10398-1-imp@bsdimp.com> References: <20240724220449.10398-1-imp@bsdimp.com> MIME-Version: 1.0 Received-SPF: none client-ip=2607:f8b0:4864:20::d35; envelope-from=imp@bsdimp.com; helo=mail-io1-xd35.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, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=unavailable 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: Stacey Son Added function to initialize ARM CPU and check if it supports 64-bit mode. Implemented CPU loop function to handle exceptions and emulate execution of instructions. Added function to clone CPU state to create a new thread. Included AArch64 specific CPU functions for bsd-user to set and receive thread-local-storage value from the tpidr_el0 register. Introduced structure for storing CPU register states for BSD-USER. Signed-off-by: Stacey Son Signed-off-by: Ajeet Singh Co-authored-by: Kyle Evans Co-authored-by: Sean Bruno Co-authored-by: Jessica Clarke Reviewed-by: Warner Losh Reviewed-by: Richard Henderson Message-Id: <20240707191128.10509-2-itachis@FreeBSD.org> Signed-off-by: Warner Losh --- bsd-user/aarch64/target_arch_cpu.c | 31 +++++ bsd-user/aarch64/target_arch_cpu.h | 192 +++++++++++++++++++++++++++++ bsd-user/aarch64/target_syscall.h | 51 ++++++++ 3 files changed, 274 insertions(+) create mode 100644 bsd-user/aarch64/target_arch_cpu.c create mode 100644 bsd-user/aarch64/target_arch_cpu.h create mode 100644 bsd-user/aarch64/target_syscall.h diff --git a/bsd-user/aarch64/target_arch_cpu.c b/bsd-user/aarch64/target_arch_cpu.c new file mode 100644 index 00000000000..b2fa59efaf6 --- /dev/null +++ b/bsd-user/aarch64/target_arch_cpu.c @@ -0,0 +1,31 @@ +/* + * ARM AArch64 specific CPU for bsd-user + * + * Copyright (c) 2015 Stacey Son + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see . + */ +#include "qemu/osdep.h" +#include "target_arch.h" + +/* See cpu_set_user_tls() in arm64/arm64/vm_machdep.c */ +void target_cpu_set_tls(CPUARMState *env, target_ulong newtls) +{ + env->cp15.tpidr_el[0] = newtls; +} + +target_ulong target_cpu_get_tls(CPUARMState *env) +{ + return env->cp15.tpidr_el[0]; +} diff --git a/bsd-user/aarch64/target_arch_cpu.h b/bsd-user/aarch64/target_arch_cpu.h new file mode 100644 index 00000000000..5c150bb7e9c --- /dev/null +++ b/bsd-user/aarch64/target_arch_cpu.h @@ -0,0 +1,192 @@ +/* + * ARM AArch64 cpu init and loop + * + * Copyright (c) 2015 Stacey Son + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see . + */ + +#ifndef TARGET_ARCH_CPU_H +#define TARGET_ARCH_CPU_H + +#include "target_arch.h" +#include "signal-common.h" +#include "target/arm/syndrome.h" + +#define TARGET_DEFAULT_CPU_MODEL "any" + +static inline void target_cpu_init(CPUARMState *env, + struct target_pt_regs *regs) +{ + int i; + + if (!(arm_feature(env, ARM_FEATURE_AARCH64))) { + fprintf(stderr, "The selected ARM CPU does not support 64 bit mode\n"); + exit(1); + } + for (i = 0; i < 31; i++) { + env->xregs[i] = regs->regs[i]; + } + env->pc = regs->pc; + env->xregs[31] = regs->sp; +} + + +static inline void target_cpu_loop(CPUARMState *env) +{ + CPUState *cs = env_cpu(env); + int trapnr, ec, fsc, si_code, si_signo; + uint64_t code, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8; + uint32_t pstate; + abi_long ret; + + for (;;) { + cpu_exec_start(cs); + trapnr = cpu_exec(cs); + cpu_exec_end(cs); + process_queued_cpu_work(cs); + + switch (trapnr) { + case EXCP_SWI: + /* See arm64/arm64/trap.c cpu_fetch_syscall_args() */ + code = env->xregs[8]; + if (code == TARGET_FREEBSD_NR_syscall || + code == TARGET_FREEBSD_NR___syscall) { + code = env->xregs[0]; + arg1 = env->xregs[1]; + arg2 = env->xregs[2]; + arg3 = env->xregs[3]; + arg4 = env->xregs[4]; + arg5 = env->xregs[5]; + arg6 = env->xregs[6]; + arg7 = env->xregs[7]; + arg8 = 0; + } else { + arg1 = env->xregs[0]; + arg2 = env->xregs[1]; + arg3 = env->xregs[2]; + arg4 = env->xregs[3]; + arg5 = env->xregs[4]; + arg6 = env->xregs[5]; + arg7 = env->xregs[6]; + arg8 = env->xregs[7]; + } + ret = do_freebsd_syscall(env, code, arg1, arg2, arg3, + arg4, arg5, arg6, arg7, arg8); + /* + * The carry bit is cleared for no error; set for error. + * See arm64/arm64/vm_machdep.c cpu_set_syscall_retval() + */ + pstate = pstate_read(env); + if (ret >= 0) { + pstate &= ~PSTATE_C; + env->xregs[0] = ret; + } else if (ret == -TARGET_ERESTART) { + env->pc -= 4; + break; + } else if (ret != -TARGET_EJUSTRETURN) { + pstate |= PSTATE_C; + env->xregs[0] = -ret; + } + pstate_write(env, pstate); + break; + + case EXCP_INTERRUPT: + /* Just indicate that signals should be handle ASAP. */ + break; + + case EXCP_UDEF: + force_sig_fault(TARGET_SIGILL, TARGET_ILL_ILLOPN, env->pc); + break; + + + case EXCP_PREFETCH_ABORT: + case EXCP_DATA_ABORT: + /* We should only arrive here with EC in {DATAABORT, INSNABORT}. */ + ec = syn_get_ec(env->exception.syndrome); + assert(ec == EC_DATAABORT || ec == EC_INSNABORT); + + /* Both EC have the same format for FSC, or close enough. */ + fsc = extract32(env->exception.syndrome, 0, 6); + switch (fsc) { + case 0x04 ... 0x07: /* Translation fault, level {0-3} */ + si_signo = TARGET_SIGSEGV; + si_code = TARGET_SEGV_MAPERR; + break; + case 0x09 ... 0x0b: /* Access flag fault, level {1-3} */ + case 0x0d ... 0x0f: /* Permission fault, level {1-3} */ + si_signo = TARGET_SIGSEGV; + si_code = TARGET_SEGV_ACCERR; + break; + case 0x11: /* Synchronous Tag Check Fault */ + si_signo = TARGET_SIGSEGV; + si_code = /* TARGET_SEGV_MTESERR; */ TARGET_SEGV_ACCERR; + break; + case 0x21: /* Alignment fault */ + si_signo = TARGET_SIGBUS; + si_code = TARGET_BUS_ADRALN; + break; + default: + g_assert_not_reached(); + } + force_sig_fault(si_signo, si_code, env->exception.vaddress); + break; + + case EXCP_DEBUG: + case EXCP_BKPT: + force_sig_fault(TARGET_SIGTRAP, TARGET_TRAP_BRKPT, env->pc); + break; + + case EXCP_ATOMIC: + cpu_exec_step_atomic(cs); + break; + + case EXCP_YIELD: + /* nothing to do here for user-mode, just resume guest code */ + break; + default: + fprintf(stderr, "qemu: unhandled CPU exception 0x%x - aborting\n", + trapnr); + cpu_dump_state(cs, stderr, 0); + abort(); + } /* switch() */ + process_pending_signals(env); + /* + * Exception return on AArch64 always clears the exclusive + * monitor, so any return to running guest code implies this. + * A strex (successful or otherwise) also clears the monitor, so + * we don't need to specialcase EXCP_STREX. + */ + env->exclusive_addr = -1; + } /* for (;;) */ +} + + +/* See arm64/arm64/vm_machdep.c cpu_fork() */ +static inline void target_cpu_clone_regs(CPUARMState *env, target_ulong newsp) +{ + if (newsp) { + env->xregs[31] = newsp; + } + env->regs[0] = 0; + env->regs[1] = 0; + pstate_write(env, 0); +} + +static inline void target_cpu_reset(CPUArchState *env) +{ +} + + +#endif /* TARGET_ARCH_CPU_H */ diff --git a/bsd-user/aarch64/target_syscall.h b/bsd-user/aarch64/target_syscall.h new file mode 100644 index 00000000000..08ae913c42e --- /dev/null +++ b/bsd-user/aarch64/target_syscall.h @@ -0,0 +1,51 @@ +/* + * ARM AArch64 specific CPU for bsd-user + * + * Copyright (c) 2015 Stacey D. Son + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see . + */ + +#ifndef BSD_USER_AARCH64_TARGET_SYSCALL_H +#define BSD_USER_AARCH64_TARGET_SYSCALL_H + +/* + * The aarch64 registers are named: + * + * x0 through x30 - for 64-bit-wide access (same registers) + * Register '31' is one of two registers depending on the instruction context: + * For instructions dealing with the stack, it is the stack pointer, named rsp + * For all other instructions, it is a "zero" register, which returns 0 when + * read and discards data when written - named rzr (xzr, wzr) + * + * Usage during syscall/function call: + * r0-r7 are used for arguments and return values + * For syscalls, the syscall number is in r8 + * r9-r15 are for temporary values (may get trampled) + * r16-r18 are used for intra-procedure-call and platform values (avoid) + * The called routine is expected to preserve r19-r28 + * r29 and r30 are used as the frame register and link register (avoid) + * See the ARM Procedure Call Reference for details. + */ +struct target_pt_regs { + uint64_t regs[31]; + uint64_t sp; + uint64_t pc; + uint64_t pstate; +}; + +#define TARGET_HW_MACHINE "arm64" +#define TARGET_HW_MACHINE_ARCH "aarch64" + +#endif /* BSD_USER_AARCH64_TARGET_SYSCALL_H */