On Sep 17, 2013, at 2:19 PM, Binh Tran <binh_t...@phoenix.com> wrote:
> Hi all,
>
> StrLen() function MdePkg file BaseLib/String.c will ASSERT if the string is
> not DWORD aligned.
>
> I’m very curious, what is the rationale for this ASSERT?
The EFI ABI requires that types are naturally aligned. Since a CHAR16 is
16-bits it needs to be aligned on a 16-bit boundary.
UEFI 2.4
2.3.1 Data Types
Table 6 lists the common data types that are used in the interface definitions,
and Table 7 lists their modifiers. Unless otherwise specified all data types
are naturally aligned. Structures are aligned on boundaries equal to the
largest internal datum of the structure and internal data are implicitly padded
to achieve natural alignment.
The values of the pointers passed into or returned by the UEFI interfaces must
provide natural alignment for the underlying types.
Thanks,
Andrew Fish
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