casaroli commented on code in PR #20724: URL: https://github.com/apache/nuttx/pull/20724#discussion_r4304230023
########## libs/libc/machine/arm64/arch_makecontext.c: ########## @@ -0,0 +1,125 @@ +/**************************************************************************** + * libs/libc/machine/arm64/arch_makecontext.c + * + * SPDX-License-Identifier: Apache-2.0 + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. The + * ASF licenses this file to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance with the + * License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT + * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the + * License for the specific language governing permissions and limitations + * under the License. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <signal.h> +#include <stdarg.h> +#include <stdint.h> +#include <ucontext.h> + +/**************************************************************************** + * Public Function Prototypes + ****************************************************************************/ + +/* In arch_ucontext.S, and called from there */ + +void arm64_ucontext_start(void); +int arm64_ucontext_getmask(FAR ucontext_t *ucp); +void arm64_ucontext_setmask(FAR const ucontext_t *ucp); +void arm64_ucontext_swapmask(FAR const ucontext_t *ucp, + FAR ucontext_t *oucp); + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: arm64_ucontext_getmask, arm64_ucontext_setmask and + * arm64_ucontext_swapmask + * + * Description: + * Save and restore the signal mask of a context, for getcontext(), + * setcontext() and swapcontext(). + * + ****************************************************************************/ + +int arm64_ucontext_getmask(FAR ucontext_t *ucp) +{ + return sigprocmask(SIG_BLOCK, NULL, &ucp->uc_sigmask); +} + +void arm64_ucontext_setmask(FAR const ucontext_t *ucp) +{ + sigprocmask(SIG_SETMASK, &ucp->uc_sigmask, NULL); +} + +void arm64_ucontext_swapmask(FAR const ucontext_t *ucp, + FAR ucontext_t *oucp) +{ + sigprocmask(SIG_SETMASK, &ucp->uc_sigmask, &oucp->uc_sigmask); +} + +/**************************************************************************** + * Name: makecontext + * + * Description: + * Make ucp run func(argc integer arguments) on ucp->uc_stack. When func + * returns, the context continues with ucp->uc_link, or the task exits if + * it is NULL. + * + ****************************************************************************/ + +void makecontext(FAR ucontext_t *ucp, CODE void (*func)(void), int argc, + ...) +{ + FAR uint64_t *stack; + uintptr_t sp; + va_list ap; + int i; + + sp = ((uintptr_t)ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size) & ~15; + + /* The first eight arguments go in x0-x7, the others on the stack */ + + if (argc > 8) + { + sp = (sp - (argc - 8) * sizeof(uint64_t)) & ~15; + } + + stack = (FAR uint64_t *)sp; + + va_start(ap, argc); + for (i = 0; i < argc; i++) + { + if (i < 8) + { + ucp->uc_mcontext.regs[i] = (uint64_t)va_arg(ap, int); Review Comment: Done. ########## arch/arm64/include/ucontext.h: ########## @@ -0,0 +1,52 @@ +/**************************************************************************** + * arch/arm64/include/ucontext.h + * + * SPDX-License-Identifier: Apache-2.0 + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. The + * ASF licenses this file to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance with the + * License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT + * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the + * License for the specific language governing permissions and limitations + * under the License. + * + ****************************************************************************/ + +#ifndef __ARCH_ARM64_INCLUDE_UCONTEXT_H +#define __ARCH_ARM64_INCLUDE_UCONTEXT_H + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <stdint.h> + +/**************************************************************************** + * Public Types + ****************************************************************************/ + +/* The machine context of getcontext() and makecontext(). The assembly code + * in libs/libc/machine/arm64/arch_ucontext.S knows this layout. + */ + +typedef struct mcontext_s +{ + uint64_t regs[31]; /* x0-x30 */ Review Comment: Done for x8-x18. x0-x7 stay, because `makecontext()` gives the arguments in them. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
