Hi,
So your patch can't work, because, the program never reach the routine
software_interrupt, it always goes on abort_prefetch. This is the sample of my
.ld (I do a entirely RAM project). We
must not use RedBoot.
MEMORY
{
ram : ORIGIN = 0x04000000, LENGTH = 0x00080000
}
SECTIONS
{
SECTIONS_BEGIN
SECTION_rom_vectors (ram, 0x04000000, LMA_EQ_VMA)
SECTION_fixed_vectors (ram, ALIGN (0x04), LMA_EQ_VMA)
SECTION_text (ram, ALIGN (0x4), LMA_EQ_VMA)
SECTION_fini (ram, ALIGN (0x4), LMA_EQ_VMA)
SECTION_rodata (ram, ALIGN (0x4), LMA_EQ_VMA)
SECTION_rodata1 (ram, ALIGN (0x4), LMA_EQ_VMA)
SECTION_fixup (ram, ALIGN (0x4), LMA_EQ_VMA)
SECTION_gcc_except_table (ram, ALIGN (0x4), LMA_EQ_VMA)
SECTION_data (ram, ALIGN (0x4), LMA_EQ_VMA)
SECTION_bss (ram, ALIGN (0x4), LMA_EQ_VMA)
CYG_LABEL_DEFN(__heap1) = ALIGN (0x8);
SECTIONS_END
}
We need swi to implement syscall like linux. So we make a swi to enter on the
exception handler and after modify the fields of the info parameter (cast in
HAL_SavedRegisters) to point
on a function we define(modify pc, sp). We need after all the stuff do return
on the calling thread but it never goes.
Thank for future help
Best regards
----------------------------------------
> Date: Thu, 20 Mar 2008 10:11:33 -0600
> From: [EMAIL PROTECTED]
> To: [EMAIL PROTECTED]
> CC: [email protected]
> Subject: Re: [ECOS] data abort exception (SWI)
>
> trollepi jj wrote:
>> Hi,
>> I try to make a ecos project without Redboot for an atmel AT91M55800A
>> (phycore). So it's a RAM project. I compile and debug an application without
>> any problems.
>> When i try to generate a SWI (with asm("swi")), the application reach the
>> exeption handler that I define but the number of the exception is not
>> CYGNUM_HAL_VECTOR_SOFTWARE_INTERRUPT (number 2 that i give on
>> cyg_exception_set_handler) but CYGNUM_HAL_VECTOR_ABORT_PREFETCH (number 3) .
>> Maybe I might modify vector.S to do the remap (like hal_platform_setup.h ).
>> If anybody have an idea? I search on your mailing and nothing fit well.
>
> Why are you trying to use the SWI instruction?
>
> In any case, it looks like there is a typo in the SWI handler.
> I'm pretty sure no one has ever actually used this path!
>
> Please try the attached patch and let me know if it fixes
> your problem.
>
> --
> ------------------------------------------------------------
> Gary Thomas | Consulting for the
> MLB Associates | Embedded world
> ------------------------------------------------------------
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