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Re: [PATCH] _dl_start: Remove internal_function attribute

On 08/14/2017 02:30 PM, H.J. Lu wrote:

>> diff --git a/sysdeps/i386/dl-machine.h b/sysdeps/i386/dl-machine.h
>> index 9ee9d02c36..924de953b7 100644
>> --- a/sysdeps/i386/dl-machine.h
>> +++ b/sysdeps/i386/dl-machine.h
>> @@ -150,9 +150,11 @@ extern ElfW(Addr) _dl_profile_fixup (struct link_map *l,
>>  .globl _start\n\
>>  .globl _dl_start_user\n\
>>  _start:\n\
>> -       # Note that _dl_start gets the parameter in %eax.\n\
>>         movl %esp, %eax\n\
>> +        subl $12, %esp\n\
>> +        pushl %eax\n\
>>         call _dl_start\n\
>> +        addl $16, %esp\n\
>>  _dl_start_user:\n\
>>         # Save the user entry point address in %edi.\n\
>>         movl %eax, %edi\n\
> CFI adjustments are missing.

%ebp is zero at process startup, so based on an existing comment, we are
not supposed to unwind to _start:

# Clear %ebp, so that even constructors have terminated backchain.\n\

I expect that the unwinder will note the absence of unwind data for
_start, look at %ebp, notice that is zero, and give up.  Isn't that what

Like I said, this is a pre-existing condition.


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