Hi Kieran,
This is the information i have gathered, when the undef exception occurs:
Exception data:
MC_ASR:
MC_ASR = 0x04040202
MISADD: Misaligned Address Abort Status1: The last aborted access was due to an
address misalignment.
ABTSZ: Abort Size StatusWord
ABTTYP: Abort Type StatusData Read
MST_ARM: ARM Abort Source1: The last aborted access was due to the ARM.
MC_AASR:
ABTADD: Abort AddressThis field contains the address of the last aborted access.
MC_AASR = 0x0011117e
code line information:
offending instruction:adds r4, r3, #0x0
offending c statement:
tcphdr = (struct tcp_hdr *)((u8_t *)p->payload + IPH_HL(iphdr) * 4);
Register data:
R3 = 0x0020135cR4 = 0x0020b1fa
CPSR = 0x0000009bSPSR_UND = 0x0000001f
Packetdata:
tcphdr @0x0020b1fa_hdrlen_rsvd_flags 0x0270
iphdr @0x0020b1e6_v_hl_tos 0x0045_len 0x3000_id 0x8651_offset
0x0040_ttl_proto 0x0680_chksum 0x43fd
pbuf_pool @0x0020b7b4
tot_len 0x05dc
len 0x05dc
flags 2
ref 0
payload 0x03030201
pbuf_pool->next @0x0020abdc
tot_len 0x05dc
len 0x05dc
flags 2
ref 0
payload 0x03030201
pbuf_pool->next->next @0x0020a5f0
tot_len 0x05dc
len 0x05dc
flags 2
ref 0
payload 0x03030201
pbuf_pool->next->next->next @0x00000000If you want some other data, than
provided in this mail, please tell
me what variable values you want.
regards,
Martin
> Subject: Re: [lwip-users] lwip + sam7x = udef exception> From: [EMAIL
> PROTECTED]> To: [email protected]> Date: Tue, 13 Feb 2007 13:56:41 +0000>
> > On Tue, 2007-02-13 at 13:35 +0000, B B wrote:> > Hi all,> > > > I am
> currently looking into a problem, where an undef exception> > occurs. The
> time in which the exception occurs,> > seem to be random from 5 minutes to 1
> hour. And i am writing here> > because this might be a common error/bug in
> the code.> > Is this based on a port that someone else wrote, or are you
> porting lwIP> to your hardware yourself? > > It is unusual for a memory
> alignment problem to be so sporadic. Can you> find out more about the values
> of the addresses that are trying to be> accessed? Also of interest would be
> how these addresses relate to the> packet that is being processed. i.e. what
> are the addresses of the> start of the pbuf, and where do things like the
> ethernet header begin> and end.> > Kieran> > > >
> _______________________________________________> lwip-users mailing list>
> [email protected]> http://lists.nongnu.org/mailman/listinfo/lwip-users
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