191 lines
6.7 KiB
C
191 lines
6.7 KiB
C
/****************************************************************************
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* arch/arm/src/armv7-a/arm_dataabort.c
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*
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* Copyright (C) 2013 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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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/* Output debug info if stack dump is selected -- even if debug is not
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* selected.
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*/
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#ifdef CONFIG_ARCH_STACKDUMP
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# undef CONFIG_DEBUG
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# undef CONFIG_DEBUG_VERBOSE
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# define CONFIG_DEBUG 1
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# define CONFIG_DEBUG_VERBOSE 1
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#endif
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#include <stdint.h>
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#include <debug.h>
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#include <nuttx/irq.h>
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#include "sched/sched.h"
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#include "up_internal.h"
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#ifdef CONFIG_PAGING
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# include <nuttx/page.h>
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# include "arm.h"
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: arm_dataabort
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*
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* Input parameters:
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* regs - The standard, ARM register save array.
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*
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* If CONFIG_PAGING is selected in the NuttX configuration file, then these
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* additional input values are expected:
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*
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* dfar - Fault address register. On a data abort, the ARM MMU places the
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* miss virtual address (MVA) into the DFAR register. This is the address
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* of the data which, when accessed, caused the fault.
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* dfsr - Fault status register. On a data a abort, the ARM MMU places an
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* encoded four-bit value, the fault status, along with the four-bit
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* encoded domain number, in the data DFSR
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*
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* Description:
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* This is the data abort exception handler. The ARM data abort exception
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* occurs when a memory fault is detected during a data transfer.
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*
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****************************************************************************/
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#ifdef CONFIG_PAGING
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uint32_t *arm_dataabort(uint32_t *regs, uint32_t dfar, uint32_t dfsr)
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{
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struct tcb_s *tcb = this_task();
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uint32_t *savestate;
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/* Save the saved processor context in CURRENT_REGS where it can be accessed
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* for register dumps and possibly context switching.
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*/
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savestate = (uint32_t *)CURRENT_REGS;
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CURRENT_REGS = regs;
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/* In the NuttX on-demand paging implementation, only the read-only, .text
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* section is paged. However, the ARM compiler generated PC-relative data
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* fetches from within the .text sections. Also, it is customary to locate
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* read-only data (.rodata) within the same section as .text so that it
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* does not require copying to RAM. Misses in either of these case should
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* cause a data abort.
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*
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* We are only interested in data aborts due to page translations faults.
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* Sections should already be in place and permissions should already be
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* be set correctly (to read-only) so any other data abort reason is a
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* fatal error.
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*/
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pglldbg("DFSR: %08x DFAR: %08x\n", dfsr, dfar);
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if ((dfsr & FSR_MASK) != FSR_PAGE)
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{
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goto segfault;
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}
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/* Check the (virtual) address of data that caused the data abort. When
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* the exception occurred, this address was provided in the DFAR register.
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* (It has not yet been saved in the register context save area).
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*/
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pgllvdbg("VBASE: %08x VEND: %08x\n", PG_PAGED_VBASE, PG_PAGED_VEND);
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if (dfar < PG_PAGED_VBASE || dfar >= PG_PAGED_VEND)
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{
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goto segfault;
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}
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/* Save the offending data address as the fault address in the TCB of
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* the currently task. This fault address is also used by the prefetch
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* abort handling; this will allow common paging logic for both
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* prefetch and data aborts.
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*/
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tcb->xcp.dfar = regs[REG_R15];
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/* Call pg_miss() to schedule the page fill. A consequences of this
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* call are:
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*
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* (1) The currently executing task will be blocked and saved on
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* on the g_waitingforfill task list.
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* (2) An interrupt-level context switch will occur so that when
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* this function returns, it will return to a different task,
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* most likely the page fill worker thread.
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* (3) The page fill worker task has been signalled and should
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* execute immediately when we return from this exception.
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*/
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pg_miss();
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/* Restore the previous value of CURRENT_REGS. NULL would indicate that
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* we are no longer in an interrupt handler. It will be non-NULL if we
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* are returning from a nested interrupt.
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*/
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CURRENT_REGS = savestate;
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return regs;
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segfault:
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lldbg("Data abort. PC: %08x DFAR: %08x DFSR: %08x\n",
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regs[REG_PC], dfar, dfsr);
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PANIC();
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return regs; /* To keep the compiler happy */
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}
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#else /* CONFIG_PAGING */
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uint32_t *arm_dataabort(uint32_t *regs, uint32_t dfar, uint32_t dfsr)
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{
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/* Save the saved processor context in CURRENT_REGS where it can be accessed
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* for register dumps and possibly context switching.
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*/
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CURRENT_REGS = regs;
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/* Crash -- possibly showing diagnostic debug information. */
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lldbg("Data abort. PC: %08x DFAR: %08x DFSR: %08x\n",
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regs[REG_PC], dfar, dfsr);
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PANIC();
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return regs; /* To keep the compiler happy */
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}
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#endif /* CONFIG_PAGING */
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