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Re: [PATCH 17/21] ARC: testsuite fix: stdlib/tst-makecontext
- From: Vineet Gupta <vineet dot gupta1 at synopsys dot com>
- To: Andreas Schwab <schwab at linux-m68k dot org>
- Cc: <libc-alpha at sourceware dot org>, <linux-snps-arc at lists dot infradead dot org>
- Date: Mon, 21 Jan 2019 14:32:30 -0800
- Subject: Re: [PATCH 17/21] ARC: testsuite fix: stdlib/tst-makecontext
- Newsgroups: gmane.comp.lib.glibc.alpha, gmane.linux.kernel.arc
- References: <1545167083-16764-1-git-send-email-vgupta@synopsys.com> <1545167083-16764-18-git-send-email-vgupta@synopsys.com> <87ftuu799k.fsf@igel.home>
On 12/18/18 2:36 PM, Andreas Schwab wrote:
>> ENTRY(__startcontext)
>>
>> + cfi_register (blink, r15)
>> +
> You should precede that with a dummy .cfi_label (see
> sysdeps/riscv/start.S) to force the CFI into the FDE instead of the
> CIE. Also, can you use cfi_undefined instead?
Yes that works as well.
ENTRY (__startcontext)
- cfi_register (blink, r15)
+ .cfi_label .Ldummy
+ cfi_undefined (blink)
00035e14 <__startcontext>:
35e14: jl [r13]
35e18: mov r0,r14
35e1c: breq.nt r0,0,8 ;35e24 <__startcontext+0x10>
35e20: bl -168 ;35d78 <setcontext>
35e24: b -38248 ;2c8bc <exit>
New
----
0000058c 00000010 00000590 FDE cie=00000000 pc=00035e14..00035e28
DW_CFA_undefined: r31
DW_CFA_nop
Old
----
00035df4 <__startcontext>:
35df4: jl [r13]
35df8: mov r0,r14
35dfc: breq.nt r0,0,8 ;35e04 <__startcontext+0x10>
35e00: bl -168 ;35d58 <setcontext>
35e04: b -38248 ;2c89c <exit>
0000058c 00000014 00000000 CIE
Version: 1
Augmentation: "zR"
Code alignment factor: 1
Data alignment factor: -4
Return address column: 31
Augmentation data: 1b
DW_CFA_def_cfa: r28 ofs 0
DW_CFA_register: r31 in r15
DW_CFA_nop
000005a4 00000010 0000001c FDE cie=0000058c pc=00035df4..00035e08
DW_CFA_nop
DW_CFA_nop
DW_CFA_nop