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Add on-demand paging support to ARM9 prefetch abort handler

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2860 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2010-08-17 01:37:39 +00:00
parent 021ee2e638
commit 9615972da7
3 changed files with 75 additions and 20 deletions
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2
arch/arm/include/arm/irq.h
View File

@ -1,7 +1,7 @@
/****************************************************************************
* arch/arm/include/arm/irq.h
*
* Copyright (C) 2009 Gregory Nutt. All rights reserved.
* Copyright (C) 2009-2010 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without

58
arch/arm/src/arm/up_prefetchabort.c
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@ -1,7 +1,7 @@
/****************************************************************************
* arch/arm/src/src/up_prefetchabort.c
*
* Copyright (C) 2007-2009 Gregory Nutt. All rights reserved.
* Copyright (C) 2007-2010 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
@ -41,7 +41,11 @@
#include <stdint.h>
#include <debug.h>
#include <nuttx/irq.h>
#ifdef CONFIG_PAGING
# include <nuttx/page.h>
#endif
#include "os_internal.h"
#include "up_internal.h"
@ -50,6 +54,20 @@
* Pre-processor Definitions
****************************************************************************/
/* Configuration ************************************************************/
#ifdef CONFIG_PAGING
# ifndef CONFIG_PAGING_PAGESIZE
# error "CONFIG_PAGING_PAGESIZE is not defined in your .config file"
# endif
# ifndef CONFIG_PAGING_NLOCKED
# error "CONFIG_PAGING_NLOCKED is not defined in your .config file"
# endif
# ifndef CONFIG_PAGING_NPAGES
# error "CONFIG_PAGING_NPAGES is not defined in your .config file"
# endif
#endif
/* Output debug info if stack dump is selected -- even if
* debug is not selected.
*/
@ -77,7 +95,43 @@
void up_prefetchabort(uint32_t *regs)
{
lldbg("Prefetch abort at 0x%x\n", regs[REG_PC]);
/* Save the saved processor context in current_regs where it can be accessed
* for register dumps and possibly context switching.
*/
current_regs = regs;
#ifdef CONFIG_PAGING
/* Get the (virtual) address of instruction that caused the prefetch abort.
* When the exception occurred, this address was provide in the lr register
* and this value was saved in the context save area as the PC at the
* REG_R15 index.
*
* Check to see if this miss address is within the configured range of
* virtual addresses.
*/
if (regs[REG_R15] >= CONFIG_PAGING_PAGEDBASE &&
regs[REG_R15] < CONFIG_PAGING_PAGEDEND)
{
/* Call pg_miss() to schedule the page fill. A consequences of this
* call are:
*
* (1) The currently executing task will be blocked and saved on
* on the g_waitingforfill task list.
* (2) An interrupt-level context switch will occur so that when
* this function returns, it will return to a different task,
* most likely the page fill worker thread.
* (3) The page fill worker task has been signalled and should
* execute immediately when we return from this exception.
*/
pg_miss();
}
else
#endif
{
lldbg("Prefetch abort at 0x%x\n", regs[REG_PC]);
PANIC(OSERR_ERREXCEPTION);
}
}

33
arch/arm/src/arm/up_vectors.S
View File

@ -1,7 +1,7 @@
/************************************************************************************
* arch/arm/src/arm/up_vectors.S
*
* Copyright (C) 2007-2009 Gregory Nutt. All rights reserved.
* Copyright (C) 2007-2010 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
@ -82,8 +82,8 @@ g_aborttmp:
* Name: up_vectorirq
*
* Description:
* Interrupt excetpion. Entered in IRQ mode with spsr = SVC
* CPSR, lr = SVC PC
* Interrupt excetpion. Entered in IRQ mode with spsr = SVC CPSR, lr = SVC PC
*
************************************************************************************/
.globl up_vectorirq
@ -91,7 +91,6 @@ g_aborttmp:
up_vectorirq:
/* On entry, we are in IRQ mode. We are free to use
* the IRQ mode r13 and r14.
*
*/
ldr r13, .Lirqtmp
@ -159,7 +158,8 @@ up_vectorirq:
* Function: up_vectorswi
*
* Description:
* SWI interrupt. We enter the SWI in SVC mode
* SWI interrupt. We enter the SWI in SVC mode.
*
************************************************************************************/
.globl up_vectorswi
@ -205,9 +205,10 @@ up_vectorswi:
* Name: up_vectordata
*
* Description:
* Data abort Exception dispatcher. Give control to data
* abort handler. This function is entered in ABORT mode
* with spsr = SVC CPSR, lr = SVC PC
* This is the data abort exception dispatcher. The ARM data abort exception occurs
* when a memory fault is detected during a data transfer. This handler saves the
* current processor state and gives control to data abort handler. This function
* is entered in ABORT mode with spsr = SVC CPSR, lr = SVC PC
*
************************************************************************************/
@ -274,8 +275,11 @@ up_vectordata:
* Name: up_vectorprefetch
*
* Description:
* Prefetch abort exception. Entered in ABT mode with
* spsr = SVC CPSR, lr = SVC PC
* This is the prefetch abort exception dispatcher. The ARM prefetch abort exception
* occurs when a memory fault is detected during an an instruction fetch. This
* handler saves the current processor state and gives control to prefetch abort
* handler. This function is entered in ABT mode with spsr = SVC CPSR, lr = SVC PC.
*
************************************************************************************/
.globl up_vectorprefetch
@ -341,8 +345,8 @@ up_vectorprefetch:
* Name: up_vectorundefinsn
*
* Description:
* Undefined instruction entry exception. Entered in
* UND mode, spsr = SVC CPSR, lr = SVC PC
* Undefined instruction entry exception. Entered in UND mode, spsr = SVC CPSR,
* lr = SVC PC
*
************************************************************************************/
@ -409,6 +413,7 @@ up_vectorundefinsn:
*
* Description:
* Shouldn't happen
*
************************************************************************************/
.globl up_vectorfiq
@ -419,10 +424,6 @@ up_vectorfiq:
/************************************************************************************
* Name: up_interruptstack/g_userstack
*
* Description:
* Shouldn't happen
*
************************************************************************************/
#if CONFIG_ARCH_INTERRUPTSTACK > 3