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Start data abort handler (not finished)

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2861 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2010-08-17 13:45:45 +00:00
parent 9615972da7
commit 5c588c9329
2 changed files with 58 additions and 3 deletions
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55
arch/arm/src/arm/up_dataabort.c
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@ -1,7 +1,7 @@
/****************************************************************************
* arch/arm/src/arm/up_dataabort.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
@ -74,11 +74,60 @@
/****************************************************************************
* Name: up_dataabort
*
* Description:
* This is the data abort exception handler. The ARM data abort exception
* occurs when a memory fault is detected during a data transfer.
*
****************************************************************************/
void up_dataabort(uint32_t *regs)
{
lldbg("Data 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;
PANIC(OSERR_ERREXCEPTION);
#ifdef CONFIG_PAGING
/* In the NuttX on-demand paging implementation, only the read-only, .text
* section is paged. However, the ARM compiler generated PC-relative data
* fetches from within the .text sections. Also, it is customary to locate
* read-only data (.rodata) within the same section as .text so that it
* does not require copying to RAM. Misses in either of these case should
* cause a data abort.
*/
#warning "Lots of missing logic"
#if 0
/* Get the (virtual) address of instruction that caused the data 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.
*/
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
#endif
{
lldbg("Data abort at 0x%x\n", regs[REG_PC]);
PANIC(OSERR_ERREXCEPTION);
}
}

6
arch/arm/src/arm/up_prefetchabort.c
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@ -91,6 +91,12 @@
/****************************************************************************
* Name: up_prefetchabort
*
* Description;
* This is the prefetch abort exception handler. The ARM prefetch abort
* exception occurs when a memory fault is detected during an an
* instruction fetch.
*
****************************************************************************/
void up_prefetchabort(uint32_t *regs)