[PATCH v3 1/1] Fix IAT (Import Address Table) alignment on AArch64

[Jan Beulich]

On 08.05.2026 10:28, Jan Beulich wrote:
> On 05.05.2026 10:34, Evgeny Karpov wrote:
>> The IAT should be aligned to 8 bytes in aarch64-w64-mingw32, otherwise, it might
>> result in relocation issues.
>>
>> When a function is imported from DLL, it generates the following code:
>>
>> adrp    x19, __imp_fn
>> ldr     x19, [x19, #:lo12:__imp_fn]
>>
>> 8 byte alignment is required for ldr relocation. Addresses are placed in IAT.
>> The size of the chunk on AArch64 is 8 bytes.
>> If IAT is not aligned to 8 bytes, the relocation issue appears.
>> This patch fixes this issue by aligning IAT to 8 bytes for PE32+.
>>
>> binutils/ChangeLog:
>>
>> 	* dlltool.c (make_head): Apply alignment to IAT.
>> 	(make_delay_head): Apply alignment to Delay IAT.
>> 	(main): Adjust 8 byte alignment for PE32+.
> 
> Okay, with ...
> 
>> @@ -4013,6 +4017,14 @@ main (int ac, char **av)
>>    /* Check if we generated PE+.  */
>>    create_for_pep = (strcmp (mname, "i386:x86-64") == 0
>>  		    || strcmp (mname, "arm64") == 0);
>> +  if (create_for_pep)
>> +    {
>> +      /* Update default 4 byte IAT (Import Address Table) alignemnt to 8 bytes
>> +	 for PE32+.
> 
> ... the typo here (alignment) corrected. I'll do that while committing.

Except, wait: The patch is missing your S-o-b. Which we need unless you
meanwhile have a copyright assignment in place with the FSF.

Jan

> I guess I'll also replace AArch64 with PE32+ in the title.
> 
> Jan