From nobody Tue Feb 10 20:14:10 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 165538196549567.33291188606199; Thu, 16 Jun 2022 05:19:25 -0700 (PDT) Received: from localhost ([::1]:58472 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1o1oT2-0004DI-DR for importer@patchew.org; Thu, 16 Jun 2022 08:19:21 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:36822) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1o1oQC-0001RT-Tw for qemu-devel@nongnu.org; Thu, 16 Jun 2022 08:16:24 -0400 Received: from mail.loongson.cn ([114.242.206.163]:45492 helo=loongson.cn) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1o1oQ9-0006QV-8H for qemu-devel@nongnu.org; Thu, 16 Jun 2022 08:16:24 -0400 Received: from localhost.localdomain (unknown [10.2.5.185]) by mail.loongson.cn (Coremail) with SMTP id AQAAf9DxD08LH6tiaiNGAA--.9326S4; Thu, 16 Jun 2022 20:16:15 +0800 (CST) From: Song Gao To: qemu-devel@nongnu.org Cc: richard.henderson@linaro.org, laurent@vivier.eu, gaosong@loongson.cn, Xiaojuan Yang Subject: [PATCH v17 02/13] linux-user: Add LoongArch signal support Date: Thu, 16 Jun 2022 20:16:00 +0800 Message-Id: <20220616121611.3316074-3-gaosong@loongson.cn> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20220616121611.3316074-1-gaosong@loongson.cn> References: <20220616121611.3316074-1-gaosong@loongson.cn> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: AQAAf9DxD08LH6tiaiNGAA--.9326S4 X-Coremail-Antispam: 1UD129KBjvJXoW3Xr4DZr47CFWDKrWfGF47CFg_yoWfWw4kpF WrCwn7ArWUJrWUua4kJayrZFW5Wwn7XryjkrZ7G3WFyws5tr95Was7trZrAF1UAw1UGFya kFWq93WYkFW8JFJanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnUUvcSsGvfC2KfnxnUUI43ZEXa7xR_UUUUUUUUU== X-CM-SenderInfo: 5jdr20tqj6z05rqj20fqof0/ 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=114.242.206.163; envelope-from=gaosong@loongson.cn; helo=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, SPF_HELO_PASS=-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+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZM-MESSAGEID: 1655381967114100001 Content-Type: text/plain; charset="utf-8" Signed-off-by: Song Gao Signed-off-by: Xiaojuan Yang --- linux-user/loongarch64/signal.c | 312 +++++++++++++++++++++++++ linux-user/loongarch64/target_signal.h | 13 ++ 2 files changed, 325 insertions(+) create mode 100644 linux-user/loongarch64/signal.c create mode 100644 linux-user/loongarch64/target_signal.h diff --git a/linux-user/loongarch64/signal.c b/linux-user/loongarch64/signa= l.c new file mode 100644 index 0000000000..e291d72f85 --- /dev/null +++ b/linux-user/loongarch64/signal.c @@ -0,0 +1,312 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * LoongArch emulation of Linux signals + * + * Copyright (c) 2021 Loongson Technology Corporation Limited + */ + +#include "qemu/osdep.h" +#include "qemu.h" +#include "user-internals.h" +#include "signal-common.h" +#include "linux-user/trace.h" + +#include "target/loongarch/internals.h" + +/* FP context was used */ +#define SC_USED_FP (1 << 0) + +struct target_sigcontext { + uint64_t sc_pc; + uint64_t sc_regs[32]; + uint32_t sc_flags; + uint64_t sc_extcontext[0] __attribute__((aligned(16))); +}; + +struct target_fpu_context { + uint64_t regs[32]; + uint64_t fcc; + uint32_t fcsr; +}; + +struct target_sctx_info { + uint32_t magic; + uint32_t size; + uint64_t padding; /* padding to 16 bytes */ +}; + +struct target_ucontext { + target_ulong tuc_flags; + struct target_ucontext *tuc_link; + target_stack_t tuc_stack; + target_sigset_t tuc_sigmask; + uint8_t __unused[1024 / 8 - sizeof(target_sigset_t)]; + struct target_sigcontext tuc_mcontext; +}; + +struct target_rt_sigframe { + struct target_siginfo rs_info; + struct target_ucontext rs_uc; +}; + +struct ctx_layout { + abi_ulong addr; + unsigned int size; +}; + +struct extctx_layout { + unsigned int size; + unsigned int flags; + struct ctx_layout fpu; + struct ctx_layout end; +}; + +static uint64_t read_all_fcc(CPULoongArchState *env) +{ + uint64_t ret =3D 0; + + for (int i =3D 0; i < 8; ++i) { + ret |=3D (uint64_t)env->cf[i] << (i * 8); + } + + return ret; +} + +static void write_all_fcc(CPULoongArchState *env, uint64_t val) +{ + for (int i =3D 0; i < 8; ++i) { + env->cf[i] =3D (val >> (i * 8)) & 1; + } +} + +static void *get_ctx(struct target_sctx_info *info) +{ + return (char *)info + sizeof(struct target_sctx_info); +} + +static void copy_fpu_to_sigcontext(CPULoongArchState *env, + struct extctx_layout *extctx) +{ + int i; + struct target_sctx_info *info =3D (struct target_sctx_info *)extctx->f= pu.addr; + struct target_fpu_context *fpu_ctx =3D get_ctx(info); + + for (i =3D 1; i < 32; ++i) { + __put_user(env->fpr[i], &fpu_ctx->regs[i]); + } + + fpu_ctx->fcc =3D read_all_fcc(env); + __put_user(env->fcsr0, &fpu_ctx->fcsr); + __put_user(extctx->fpu.size, &info->size); +} + +static abi_ulong extframe_alloc(struct extctx_layout *extctx, + struct ctx_layout *layout, + size_t size, abi_ulong base) +{ + abi_ulong new_base =3D base - size; + + new_base -=3D sizeof(struct target_sctx_info); + layout->addr =3D new_base; + layout->size =3D (unsigned int)(base - new_base); + extctx->size +=3D layout->size; + + return new_base; +} + +static abi_ulong setup_extcontext(struct extctx_layout *extctx, abi_ulong = sp) +{ + abi_ulong new_sp =3D sp; + + memset(extctx, 0, sizeof(struct extctx_layout)); + new_sp -=3D sizeof(struct target_sctx_info); + + extctx->end.addr =3D new_sp; + extctx->end.size =3D (unsigned int)sizeof(struct target_sctx_info); + extctx->size +=3D extctx->end.size; + extctx->flags =3D SC_USED_FP; + + new_sp =3D extframe_alloc(extctx, &extctx->fpu, + sizeof(struct target_fpu_context), new_sp); + + return new_sp; +} + +static void setup_sigcontext(CPULoongArchState *env, + struct target_sigcontext *sc, + struct extctx_layout *extctx) +{ + int i; + + __put_user(extctx->flags, &sc->sc_flags); + __put_user(env->pc, &sc->sc_pc); + + for (i =3D 1; i < 32; ++i) { + __put_user(env->gpr[i], &sc->sc_regs[i]); + } + + copy_fpu_to_sigcontext(env, extctx); +} + +static void copy_fpu_from_sigcontext(CPULoongArchState *env, + struct extctx_layout *extctx) +{ + int i; + struct target_sctx_info *info =3D (struct target_sctx_info *)extctx->f= pu.addr; + struct target_fpu_context *fpu_ctx =3D get_ctx(info); + + for (i =3D 1; i < 32; ++i) { + __get_user(env->fpr[i], &fpu_ctx->regs[i]); + } + write_all_fcc(env, fpu_ctx->fcc); + __get_user(env->fcsr0, &fpu_ctx->fcsr); +} + +static int parse_extcontext(struct target_sigcontext *sc, + struct extctx_layout *extctx) +{ + unsigned int size; + struct target_sctx_info *info =3D (struct target_sctx_info *) + &sc->sc_extcontext; + + __get_user(size, &info->size); + + if (size < (sizeof(struct target_sctx_info) + + sizeof(struct target_fpu_context))) { + return -TARGET_EINVAL; + } + + extctx->fpu.addr =3D (abi_ulong)info; + info =3D (struct target_sctx_info *)((char *)info + size); + + return 0; +} + +static int restore_sigcontext(CPULoongArchState *env, + struct target_sigcontext *sc) +{ + int i; + int ret =3D 0; + struct extctx_layout extctx; + + memset(&extctx, 0, sizeof(struct extctx_layout)); + + __get_user(extctx.flags, &sc->sc_flags); + + ret =3D parse_extcontext(sc, &extctx); + if (ret < 0) { + goto bad; + } + + __get_user(env->pc, &sc->sc_pc); + for (i =3D 1; i < 32; ++i) { + __get_user(env->gpr[i], &sc->sc_regs[i]); + } + + copy_fpu_from_sigcontext(env, &extctx); + restore_fp_status(env); + +bad: + return ret; +} + +/* + * Determine which stack to use. + */ +static abi_ulong get_sigframe(struct target_sigaction *ka, + CPULoongArchState *env, size_t frame_size, + struct extctx_layout *extctx) +{ + abi_ulong sp; + + sp =3D target_sigsp(get_sp_from_cpustate(env) - 32, ka); + sp =3D setup_extcontext(extctx, sp); + + return (sp - frame_size) & ~15; +} + +void setup_rt_frame(int sig, struct target_sigaction *ka, + target_siginfo_t *info, + target_sigset_t *set, CPULoongArchState *env) +{ + struct target_rt_sigframe *frame; + struct extctx_layout extctx; + abi_ulong frame_addr; + int i; + + frame_addr =3D get_sigframe(ka, env, sizeof(*frame), &extctx); + trace_user_setup_rt_frame(env, frame_addr); + if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) { + goto give_sigsegv; + } + + tswap_siginfo(&frame->rs_info, info); + + __put_user(0, &frame->rs_uc.tuc_flags); + __put_user(0, &frame->rs_uc.tuc_link); + target_save_altstack(&frame->rs_uc.tuc_stack, env); + + setup_sigcontext(env, &frame->rs_uc.tuc_mcontext, &extctx); + + for (i =3D 0; i < TARGET_NSIG_WORDS; i++) { + __put_user(set->sig[i], &frame->rs_uc.tuc_sigmask.sig[i]); + } + + env->gpr[4] =3D sig; + env->gpr[5] =3D frame_addr + offsetof(struct target_rt_sigframe, rs_in= fo); + env->gpr[6] =3D frame_addr + offsetof(struct target_rt_sigframe, rs_uc= ); + env->gpr[3] =3D frame_addr; + env->gpr[1] =3D default_rt_sigreturn; + + env->pc =3D ka->_sa_handler; + unlock_user_struct(frame, frame_addr, 1); + return; + +give_sigsegv: + unlock_user_struct(frame, frame_addr, 1); + force_sigsegv(sig); +} + +long do_rt_sigreturn(CPULoongArchState *env) +{ + int ret =3D 0; + struct target_rt_sigframe *frame; + abi_ulong frame_addr; + sigset_t blocked; + + frame_addr =3D env->gpr[3]; + trace_user_do_rt_sigreturn(env, frame_addr); + if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) { + goto badframe; + } + + target_to_host_sigset(&blocked, &frame->rs_uc.tuc_sigmask); + set_sigmask(&blocked); + + ret =3D restore_sigcontext(env, &frame->rs_uc.tuc_mcontext); + if (ret < 0) { + goto badframe; + } + + target_restore_altstack(&frame->rs_uc.tuc_stack, env); + + unlock_user_struct(frame, frame_addr, 0); + return -QEMU_ESIGRETURN; + +badframe: + unlock_user_struct(frame, frame_addr, 0); + force_sig(TARGET_SIGSEGV); + return -QEMU_ESIGRETURN; +} + +void setup_sigtramp(abi_ulong sigtramp_page) +{ + uint32_t *tramp =3D lock_user(VERIFY_WRITE, sigtramp_page, 8, 0); + assert(tramp !=3D NULL); + + __put_user(0x03822c0b, tramp + 0); /* ori a7, zero, 0x8b */ + __put_user(0x002b0000, tramp + 1); /* syscall 0 */ + + default_rt_sigreturn =3D sigtramp_page; + unlock_user(tramp, sigtramp_page, 8); +} diff --git a/linux-user/loongarch64/target_signal.h b/linux-user/loongarch6= 4/target_signal.h new file mode 100644 index 0000000000..ad3aaffcb4 --- /dev/null +++ b/linux-user/loongarch64/target_signal.h @@ -0,0 +1,13 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (c) 2021 Loongson Technology Corporation Limited + */ + +#ifndef LOONGARCH_TARGET_SIGNAL_H +#define LOONGARCH_TARGET_SIGNAL_H + +#include "../generic/signal.h" + +#define TARGET_ARCH_HAS_SIGTRAMP_PAGE 1 + +#endif /* LOONGARCH_TARGET_SIGNAL_H */ --=20 2.31.1