[PATCH 2/6] arm-cp15-new-definitions New definitions for arm-cp15 Fault Status Register and ARMv6 control register.

[Hesham Moustafa]

On Fri, Sep 13, 2013 at 5:19 PM, Sebastian Huber <
sebastian.huber at embedded-brains.de> wrote:

> On 2013-09-12 08:59, Hesham AL-Matary wrote:
>
>> ---
>>   c/src/lib/libcpu/arm/shared/**include/arm-cp15.h | 21
>> +++++++++++++++++++++
>>   1 file changed, 21 insertions(+)
>>
>> diff --git a/c/src/lib/libcpu/arm/shared/**include/arm-cp15.h
>> b/c/src/lib/libcpu/arm/shared/**include/arm-cp15.h
>> index 0117a5e..badf96e 100644
>> --- a/c/src/lib/libcpu/arm/shared/**include/arm-cp15.h
>> +++ b/c/src/lib/libcpu/arm/shared/**include/arm-cp15.h
>> @@ -7,6 +7,7 @@
>>    */
>>
>>   /*
>> + * Copyright (c) 2013 Hesham AL-Matary
>>    * Copyright (c) 2009-2013 embedded brains GmbH.  All rights reserved.
>>    *
>>    *  embedded brains GmbH
>> @@ -139,6 +140,7 @@ extern "C" {
>>   #define ARM_CP15_CTRL_NMFI (1U << 27)
>>   #define ARM_CP15_CTRL_EE (1U << 25)
>>   #define ARM_CP15_CTRL_VE (1U << 24)
>> +#define ARM_CP15_CTRL_XP (1U << 23) // ARMv6
>>
>
> Please avoid // comments.
>
>
>    #define ARM_CP15_CTRL_U (1U << 22)
>>   #define ARM_CP15_CTRL_FI (1U << 21)
>>   #define ARM_CP15_CTRL_UWXN (1U << 20)
>> @@ -173,6 +175,25 @@ extern "C" {
>>
>>   /** @} */
>>
>> +/**
>> + * @name Fault Status Register Defines
>> + *
>> + * @{
>> + */
>> +
>> +#define ARM_CP15_FAULT_STATUS_MASK 0x040F
>>
>
> What is the purpose of this mask?
>
To extract the bits that describe the reason of the error.
It should be ANDed with FSR and compared with the
definitions below.

>
> How can I access the FSR?
>
> By routines at the same file (arm-cp15.h).
arm_cp15_get_instruction_fault_status
arm_cp15_get_data_fault_status

I used these definitions and functions for debugging
purposes.

>
>  +
>> +#define ARM_CP15_FSR_ALIGNMENT_FAULT   0x00000001
>> +#define ARM_CP15_FSR_BACKGROUND_FAULT  0x0000
>> +#define ARM_CP15_FSR_ACCESS_**PERMISSION_FAULT 0x000D
>> +#define ARM_CP15_FSR_PRECISE_EXTERNAL_**ABORT_FAULT 0x0008
>> +#define ARM_CP15_FSR_IMPRECISE_**EXTERNAL_ABORT_FAULT 0x0406
>> +#define ARM_CP15_FSR_PRECISE_PARITY_**ERROR_EXCEPTION 0x0006
>> +#define ARM_CP15_FSR_IMPRECISE_PARITY_**ERROR_EXCEPTION 0x0408
>> +#define ARM_CP15_FSR_DEBUG_EVENT 0x0002
>> +
>> +/** @} */
>> +
>>   static inline uint32_t arm_cp15_get_id_code(void)
>>   {
>>     ARM_SWITCH_REGISTERS;
>>
>>
>
> --
> Sebastian Huber, embedded brains GmbH
>
> Address : Dornierstr. 4, D-82178 Puchheim, Germany
> Phone   : +49 89 189 47 41-16
> Fax     : +49 89 189 47 41-09
> E-Mail  : sebastian.huber at embedded-**brains.de<sebastian.huber at embedded-brains.de>
> PGP     : Public key available on request.
>
> Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
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