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boundary="------------hKg0cwZfWKG2eUHNX18FLYCi" Message-ID: <8bd56e49-bedd-4f5b-9362-63b369d49aa5@linux.ibm.com> Date: Thu, 20 Aug 2026 00:09:39 +0530 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCHi v1] PowerPC: Create call stubs for compiled modules To: Ulrich Weigand , "gdb-patches@sourceware.org" Cc: Abhay Kandpal , "cel@linux.ibm.com" References: <20260813092829.262470-1-abhay@linux.ibm.com> <1a31198de71abfc8f36c893cc97c81b72c6112a7.camel@de.ibm.com> <9f77ef3d-f40d-4887-9984-2f18447fbadd@linux.ibm.com> From: Abhay Kandpal Content-Language: en-GB In-Reply-To: X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=CpuPtH4D c=1 sm=1 tr=0 ts=6a85f871 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=Sv0fKeRqtYgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=r77TgQKjGQsHNAKrUKIA:9 a=VnNF1IyMAAAA:8 a=bjtY7i8NfAN54PLHcogA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=WvB_-MxE-hHMtqybd60A:9 a=PVDP8YIwmKe_ZKu5:21 a=_W_S_7VecoQA:10 a=lqcHg5cX4UMA:10 X-Proofpoint-ORIG-GUID: gTsHHk07iTM3fn0_vFflz7ao7JTx8aQ9 X-Proofpoint-GUID: gTsHHk07iTM3fn0_vFflz7ao7JTx8aQ9 X-Proofpoint-Spam-Info: AW1haW4tMjYwODE5MDE0MyBTYWx0ZWRfX3Vqohz2Z7r9r 8cUdlN48sie18vfPUHGnls6nIrLcW/1/CutNNj9L9k7m9BsH+QxpPEYrBBobNoaKF41OMNpH0Nz MGA4MsHftRRPaSyuxCF0TEHwVe/j+8Y= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODE5MDE0MyBTYWx0ZWRfXykEHeTVl8lme hn35zSgpvkJvy4jMb+m4tLo12B//PF0ooPDMrTB0RnRcAmuFLDcisGF5AIfbDBHTJwcjPoyQCFm 55sMxHeEUubWqRNqxYjuV5lKF8memuRvPLH/67FNxvq9K/uvy3PbDX0mlJCPLPl3etGkpCVBJQ9 L03G4UuXPJMhIXg6dQSQ/ylZjP8t8K7B9srx3o5zzFifwG7rL3e2rSaOEhOVAfQgDrca6805ChA Wy8X3B6XNwtRKxOrIc0Xcgiw/O/gcRXprL5MxFWSyo4l8PTzv8ub9rx5zQv5M4ThyJXgxXCwEP3 1xz7nV4iEg6MhbIQ2c9yboRaK0G/C/+5WEj20ve57Hwexg6LJfhwUHxF5orzua+cMLSE5UgIgZL +cISjVNY4Px/EOdQU+kxD3D2V4Zun8u54mPONc+y7W04HEOdbvyXqVC725FhfBHuUbc0XXncabO FvQA/RWEAMcSYO2ExlA== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-19_05,2026-08-19_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 adultscore=0 bulkscore=0 malwarescore=0 phishscore=0 lowpriorityscore=0 spamscore=0 clxscore=1015 priorityscore=1501 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608190143 X-BeenThere: gdb-patches@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gdb-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gdb-patches-bounces~public-inbox=simark.ca@sourceware.org This is a multi-part message in MIME format. --------------hKg0cwZfWKG2eUHNX18FLYCi Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Hi Ulrich, That was it, thanks.|-mlongcall -mno-pltseq| fixes the problem. GCC now loads the target from the module's own .toc via TOC16_HA/TOC16_LO_DS, which BFD resolves normally, and emits the r2 save and restore around the call itself. I have created a new patch which adds these to the PowerPC compile options; I've dropped the call stub patch. Tested on powerpc64le-linux, no unexpected failures in the full testsuite. Thanks, Abhay On 19/08/26 18:09, Ulrich Weigand wrote: > Abhay Kandpal wrote: > >> 24:    std     r2,24(r1) >>   30:    addis   r12,r2,0 >>             30: R_PPC64_PLT16_HA    _setjmp >>   34:    ld      r12,0(r12) >>             34: R_PPC64_PLT16_LO_DS    _setjmp >> 80:    mtctr   r12 >>             80: R_PPC64_PLTSEQ    longjmp >> 84:    bctrl >>             84: R_PPC64_PLTCALL    longjmp >>   88:    ld      r2,24(r1) > I think you also need the -mno-pltseq option to get rid of > this inlined PLT sequence. >> > Bye, > Ulrich --------------hKg0cwZfWKG2eUHNX18FLYCi Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit 
Hi Ulrich,
That was it, thanks. -mlongcall -mno-pltseq fixes the problem. 
GCC now loads the target from the module's own .toc via TOC16_HA/TOC16_LO_DS, 
which BFD resolves normally, and emits the r2 save and restore around the call itself.
I have created a new patch which adds these to the PowerPC compile options;
I've dropped the call stub patch. Tested on powerpc64le-linux,
no unexpected failures in the full testsuite.
Thanks,
Abhay


On 19/08/26 18:09, Ulrich Weigand wrote:
Abhay Kandpal <abhay@linux.ibm.com> wrote:


  24:    std     r2,24(r1)
  30:    addis   r12,r2,0
            30: R_PPC64_PLT16_HA    _setjmp
  34:    ld      r12,0(r12)
            34: R_PPC64_PLT16_LO_DS    _setjmp
80:    mtctr   r12
            80: R_PPC64_PLTSEQ    longjmp
84:    bctrl
            84: R_PPC64_PLTCALL    longjmp
  88:    ld      r2,24(r1)

I think you also need the -mno-pltseq option to get rid of
this inlined PLT sequence.



Bye,
Ulrich
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