[PATCH v7.1 01/13] ARC: ABI Implementation

[Vineet Gupta]

On 7/1/20 9:50 AM, Adhemerval Zanella via Libc-alpha wrote:
> 
> 
> On 30/06/2020 21:06, Vineet Gupta via Libc-alpha wrote:
>> This code deals with the ARC ABI.
>> ---
>>    Changes since v7:
>>      - Used void * (iso int *) in tls-macros.h
> 
> LGTM, with just a couple of syntax nits below.
> 
> Reviewed-by: Adhemerval Zanella  <adhemerval.zanella at linaro.org>

Thx. I suppose the process for new ports is to have a Reviewed-by on all patches,
squash them and push in 1 go (although in past I was asked to push the ARC elf
header patch).
Also do we need more than 1 Reviewed-by for this to be "push worthy" ?

>> +ENTRY (__longjmp)
>> +
>> +	LDR (blink, r0,  0)
>> +	LDR (sp,    r0,  1)
>> +	LDR (fp,    r0,  2)
>> +	LDR (gp,    r0,  3)
>> +
>> +	LDR (r13,   r0,  4)
>> +	LDR (r14,   r0,  5)
>> +	LDR (r15,   r0,  6)
>> +	LDR (r16,   r0,  7)
>> +	LDR (r17,   r0,  8)
>> +	LDR (r18,   r0,  9)
>> +	LDR (r19,   r0, 10)
>> +	LDR (r20,   r0, 11)
>> +	LDR (r21,   r0, 12)
>> +	LDR (r22,   r0, 13)
>> +	LDR (r23,   r0, 14)
>> +	LDR (r24,   r0, 15)
>> +
>> +	mov.f  r0, r1
>> +	j.d    [blink]
>> +	mov.z  r0, 1	/* don't return 0 to setjmp callsite from longjmp.  */
>> +
>> +END (__longjmp)
> 
> Ok, you have removed r25 save as pre previous discussion.

Right, and GP is being saved now.

>> diff --git a/sysdeps/arc/bits/setjmp.h b/sysdeps/arc/bits/setjmp.h
>> new file mode 100644
>> index 000000000000..6bba95fafe0f
>> --- /dev/null
>> +++ b/sysdeps/arc/bits/setjmp.h
>> @@ -0,0 +1,26 @@
>> +/* Define the machine-dependent type `jmp_buf'.  ARC version.
> 
> I think current trend is to just use apostrophe instead of the grave
> accent in such cases.

Ok changed.

>> +reloc_index (uintptr_t plt0, uintptr_t pltn, size_t size)
>> +{
>> +  unsigned long int idx = pltn - plt0;
>> +
>> +  /* PLT trampoline is 16 bytes. */
> 
> Double space after period.

Fixed.

>> +#define _JMPBUF_UNWINDS_ADJ(_jmpbuf, _address, _adj) \
>> +  ((uintptr_t) (_address) - (_adj) < (uintptr_t) (_jmpbuf_sp (_jmpbuf) - (_adj)))
>> +
>> +/* We use the normal longjmp for unwinding.  */
>> +#define __libc_unwind_longjmp(buf, val) __libc_longjmp (buf, val)
> 
> Ok. As a side note teh jmpbuf-unwind.h is candidate for some consolidation
> (the same macros are replicated in each architecture).

OK.