[PATCH] [AArch64] Fix PR gdb/28681

[Luis Machado]

On 1/4/22 3:09 PM, Simon Marchi wrote:
> 
> 
> On 2022-01-04 12:22, Luis Machado via Gdb-patches wrote:
>> This is the same as commit b1718fcdd1d2a5c514f8ee504ba07fb3f42b8608, but
>> fixing things for AArch64.
>>
>> With the patch, gdb.cp/non-trivial-retval.exp has full passes on
>> AArch64-Linux Ubuntu 20.04/18.04.
>> ---
>>   gdb/aarch64-tdep.c | 9 +++++++++
>>   1 file changed, 9 insertions(+)
>>
>> diff --git a/gdb/aarch64-tdep.c b/gdb/aarch64-tdep.c
>> index 70fb66954a4..802762f303c 100644
>> --- a/gdb/aarch64-tdep.c
>> +++ b/gdb/aarch64-tdep.c
>> @@ -2323,6 +2323,15 @@ aarch64_extract_return_value (struct type *type, struct regcache *regs,
>>   	  valbuf += X_REGISTER_SIZE;
>>   	}
>>       }
>> +  else if (!language_pass_by_reference (type).trivially_copyable)
>> +    {
>> +      /* If the object is a non-trivial C++ object, the result is passed as a
>> +	 pointer stored in X0.  */
>> +      CORE_ADDR addr;
>> +
>> +      regs->cooked_read (AARCH64_X0_REGNUM, &addr);
>> +      read_memory (addr, valbuf, TYPE_LENGTH (type));
>> +    }
>>     else
>>       {
>>         /* For a structure or union the behaviour is as if the value had
> 
> I'll let somebody else review this (probably Andrew), but please change the
> patch subject to something descriptive, not just the bug number.

Did you want the entire bugzilla PR subject or something else? I can't 
really tell from your reply, sorry.