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rv32im: Add sigaction support.
Change-Id: I870bc5c03b81d3ee73d1c0b286f30e78193fc7af Signed-off-by: zhongan <zhongan@xiaomi.com>
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zhongan
liuhaitao
@@ -0,0 +1,184 @@
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/****************************************************************************
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* arch/risc-v/src/rv32im/up_schedulesigaction.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <sched.h>
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#include <debug.h>
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#include <nuttx/irq.h>
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#include <nuttx/arch.h>
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#include "sched/sched.h"
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#include "riscv_internal.h"
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#include "riscv_arch.h"
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#ifndef CONFIG_DISABLE_SIGNALS
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: up_schedule_sigaction
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*
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* Description:
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* This function is called by the OS when one or more
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* signal handling actions have been queued for execution.
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* The architecture specific code must configure things so
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* that the 'igdeliver' callback is executed on the thread
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* specified by 'tcb' as soon as possible.
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*
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* This function may be called from interrupt handling logic.
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*
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* This operation should not cause the task to be unblocked
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* nor should it cause any immediate execution of sigdeliver.
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* Typically, a few cases need to be considered:
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*
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* (1) This function may be called from an interrupt handler
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* During interrupt processing, all xcptcontext structures
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* should be valid for all tasks. That structure should
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* be modified to invoke sigdeliver() either on return
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* from (this) interrupt or on some subsequent context
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* switch to the recipient task.
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* (2) If not in an interrupt handler and the tcb is NOT
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* the currently executing task, then again just modify
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* the saved xcptcontext structure for the recipient
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* task so it will invoke sigdeliver when that task is
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* later resumed.
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* (3) If not in an interrupt handler and the tcb IS the
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* currently executing task -- just call the signal
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* handler now.
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*
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****************************************************************************/
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void up_schedule_sigaction(struct tcb_s *tcb, sig_deliver_t sigdeliver)
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{
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irqstate_t flags;
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sinfo("tcb=0x%p sigdeliver=0x%p\n", tcb, sigdeliver);
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/* Make sure that interrupts are disabled */
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flags = enter_critical_section();
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/* Refuse to handle nested signal actions */
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if (!tcb->xcp.sigdeliver)
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{
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/* First, handle some special cases when the signal is
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* being delivered to the currently executing task.
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*/
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sinfo("rtcb=0x%p g_current_regs=0x%p\n",
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this_task(), g_current_regs);
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if (tcb == this_task())
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{
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/* CASE 1: We are not in an interrupt handler and
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* a task is signalling itself for some reason.
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*/
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if (!g_current_regs)
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{
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/* In this case just deliver the signal now. */
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sigdeliver(tcb);
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}
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/* CASE 2: We are in an interrupt handler AND the
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* interrupted task is the same as the one that
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* must receive the signal, then we will have to modify
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* the return state as well as the state in the TCB.
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*
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* Hmmm... there looks like a latent bug here: The following
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* logic would fail in the strange case where we are in an
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* interrupt handler, the thread is signalling itself, but
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* a context switch to another task has occurred so that
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* g_current_regs does not refer to the thread of this_task()!
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*/
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else
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{
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/* Save the return EPC and STATUS registers. These will be
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* restored by the signal trampoline after the signals have
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* been delivered.
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*/
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tcb->xcp.sigdeliver = sigdeliver;
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tcb->xcp.saved_epc = g_current_regs[REG_EPC];
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tcb->xcp.saved_int_ctx = g_current_regs[REG_INT_CTX];
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/* Then set up to vector to the trampoline with interrupts
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* disabled
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*/
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g_current_regs[REG_EPC] = (uint32_t)up_sigdeliver;
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/* And make sure that the saved context in the TCB
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* is the same as the interrupt return context.
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*/
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up_savestate(tcb->xcp.regs);
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sinfo("PC/STATUS Saved: %08x/%08x New: %08x/%08x\n",
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tcb->xcp.saved_epc, tcb->xcp.saved_int_ctx,
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g_current_regs[REG_EPC], g_current_regs[REG_INT_CTX]);
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}
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}
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/* Otherwise, we are (1) signaling a task is not running
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* from an interrupt handler or (2) we are not in an
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* interrupt handler and the running task is signalling
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* some non-running task.
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*/
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else
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{
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/* Save the return EPC and STATUS registers. These will be
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* restored by the signal trampoline after the signals have
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* been delivered.
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*/
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tcb->xcp.sigdeliver = sigdeliver;
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tcb->xcp.saved_epc = tcb->xcp.regs[REG_EPC];
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tcb->xcp.saved_int_ctx = tcb->xcp.regs[REG_INT_CTX];
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/* Then set up to vector to the trampoline with interrupts
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* disabled
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*/
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tcb->xcp.regs[REG_EPC] = (uint32_t)up_sigdeliver;
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sinfo("PC/STATUS Saved: %08x/%08x New: %08x/%08x\n",
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tcb->xcp.saved_epc, tcb->xcp.saved_int_ctx,
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tcb->xcp.regs[REG_EPC], tcb->xcp.regs[REG_INT_CTX]);
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}
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}
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leave_critical_section(flags);
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}
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#endif /* !CONFIG_DISABLE_SIGNALS */
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