[lwip-devel] [bug #26134] Insert a dummy u16_t field to prevent alignment exceptions

[Zhenwei Chu]

URL:
  <http://savannah.nongnu.org/bugs/?26134>

                 Summary: Insert a dummy u16_t field to prevent alignment
exceptions
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: blackfin
            Submitted on: Thu 09 Apr 2009 02:06:54 PM GMT
                Category: None
                Severity: 3 - Normal
              Item Group: Change Request
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 
            lwIP version: 1.3.0

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Details:

Insert a dummy u16_t field to prevent alignment exceptions

Files Changed:
Etharp.h: line75

From:
PACK_STRUCT_BEGIN
struct eth_hdr {


#if ETH_PAD_SIZE
  PACK_STRUCT_FIELD(u8_t padding[ETH_PAD_SIZE]);
#endif
  PACK_STRUCT_FIELD(struct eth_addr dest);
  PACK_STRUCT_FIELD(struct eth_addr src);
  PACK_STRUCT_FIELD(u16_t type);
} PACK_STRUCT_STRUCT;
PACK_STRUCT_END

To:
PACK_STRUCT_BEGIN
struct eth_hdr {


#ifdef ETH_PAD_SIZE
  PACK_STRUCT_FIELD(u8_t padding[ETH_PAD_SIZE]);

#else
  /* insert a dummy u16_t field to prevent alignment exceptions */
        PACK_STRUCT_FIELD(u16_t unused1);
#endif
  PACK_STRUCT_FIELD(struct eth_addr dest);
  PACK_STRUCT_FIELD(struct eth_addr src);
  PACK_STRUCT_FIELD(u16_t type);
} PACK_STRUCT_STRUCT;
PACK_STRUCT_END





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