linux-kernel - Re: [Suggestion] arc: compiler: bug: about an arc compiler's bug which is not in gcc main source code.

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Date:	Wed, 23 Oct 2013 11:10:57 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Joern Rennecke <joern.rennecke@...ecosm.com>
CC:	Vineet Gupta <Vineet.Gupta1@...opsys.com>,
	"jeremy.bennett@...ecosm.com" <jeremy.bennett@...ecosm.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Claudiu Zissulescu <Claudiu.Zissulescu@...opsys.com>,
	Francois Bedard <Francois.Bedard@...opsys.com>
Subject: Re: [Suggestion] arc: compiler: bug: about an arc compiler's bug
 which is not in gcc main source code.

On 10/23/2013 10:48 AM, Joern Rennecke wrote:
> On 23 October 2013 03:00, Chen Gang <gang.chen@...anux.com> wrote:
> 
>> Binutils (1 issue, ld and as information):
>>
>>   when calling panic(), printk(), or memset() with R_ARC_S21W_PCREL, it may be overflow (I guess it need be R_ARC_S25W_PCREL).
>>
>>   /usr/local/bin/arc-elf32-ld --build-id -X -o .tmp_vmlinux1 -T /android/public-kernel/linux-next/arch/arc/kernel/vmlinux.lds arch/arc/kernel/head.o init/built-in.o --start-group usr/built-in.o arch/arc/built-in.o arch/arc/boot/dts/built-in.o arch/arc/plat-arcfpga/built-in.o arch/arc/plat-tb10x/built-in.o kernel/built-in.o mm/built-in.o fs/built-in.o ipc/built-in.o security/built-in.o crypto/built-in.o block/built-in.o lib/lib.a arch/arc/lib/lib.a /usr/local/lib/gcc/arc-elf32/4.8.0/libgcc.a lib/built-in.o arch/arc/lib/built-in.o /usr/local/lib/gcc/arc-elf32/4.8.0/libgcc.a drivers/built-in.o sound/built-in.o firmware/built-in.o net/built-in.o --end-group
>>   /usr/local/bin/arc-elf32-ld: Error: Overflow detected in relocation value;
>>   /usr/local/bin/arc-elf32-ld: Relocation value should be between 1048575 and -1048576 whereas it  2404264
>>   /usr/local/bin/arc-elf32-ld: Global symbol: "panic".
>>   /usr/local/bin/arc-elf32-ld:
>>   Relocation type is:R_ARC_S21W_PCREL
>>   FileName:arch/arc/built-in.o
>>   Section Name:.text
>>   Offset in Section:1716
>>   /usr/local/bin/arc-elf32-ld: final link failed: Bad value
>>   make: *** [vmlinux] Error 1
> 
> That just means that the image is too large to allow conditional
> pc-relative calls (tail/sibcalls) or otherwise.
> 
> You can avoid generating them for functions with out a relevant
> attribute with -mmedium-calls .
> 

OK, thanks, I will/should try (it should be OK).

BTW: after pass this, kernel may pass the whole cross compiling with
allmodconfig (the other 2 gcc issues, can reconstruct source code to
bypass).

> 
> 
>> GCC (2 issues, and gcc information):
>>
>>     CC      drivers/rtc/systohc.o
>>   drivers/rtc/systohc.c: In function 'rtc_set_ntp_time':
>>   drivers/rtc/systohc.c:44:1: internal compiler error: in arc_ifcvt, at config/arc/arc.c:8315
>>    }
>>    ^
>>   0x939c94 arc_ifcvt
>>         ../../gcc/gcc/config/arc/arc.c:8315
>>   0x93a394 arc_reorg
>>         ../../gcc/gcc/config/arc/arc.c:5985
>>   0x7517d9 rest_of_handle_machine_reorg
>>         ../../gcc/gcc/reorg.c:3927
>>   Please submit a full bug report,
>>   with preprocessed source if appropriate.
>>   Please include the complete backtrace with any bug report.
>>   See <http://gcc.gnu.org/bugs.html> for instructions.
>>   make[2]: *** [drivers/rtc/systohc.o] Error 1
>>   make[1]: *** [drivers/rtc] Error 2
>>   make: *** [drivers] Error 2
>>
>>
>>     CC [M]  drivers/target/target_core_pr.o
>>   drivers/target/target_core_pr.c: In function 'target_scsi3_emulate_pr_in':
>>   drivers/target/target_core_pr.c:4033:1: error: unrecognizable insn:
>>    }
>>    ^
>>   (insn 846 194 196 12 (set (reg:QI 1 r1)
>>           (subreg:QI (mem/j/c:DI (plus:SI (reg/v/f:SI 2 r2 [orig:199 pr_reg ] [199])
>>                       (const_int 576 [0x240])) [0 pr_reg_50->pr_res_key+0 S8 A32]) 7)) drivers/target/target_core_pr.c:3677 -1
>>        (nil))
>>   drivers/target/target_core_pr.c:4033:1: internal compiler error: in extract_insn, at recog.c:2151
>>   0x758fb5 _fatal_insn(char const*, rtx_def const*, char const*, int, char const*)
>>         ../../gcc/gcc/rtl-error.c:109
>>   0x758fe9 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
>>         ../../gcc/gcc/rtl-error.c:117
>>   0x726e83 extract_insn(rtx_def*)
>>         ../../gcc/gcc/recog.c:2151
>>   0x726ef4 extract_insn_cached(rtx_def*)
>>         ../../gcc/gcc/recog.c:2054
>>   0x5fe026 cleanup_subreg_operands(rtx_def*)
>>         ../../gcc/gcc/final.c:3305
>>   0x750c2e reload(rtx_def*, int)
>>         ../../gcc/gcc/reload1.c:1240
>>   0x68e703 do_reload
>>         ../../gcc/gcc/ira.c:4631
>>   0x68e703 rest_of_handle_reload
>>         ../../gcc/gcc/ira.c:4731
>>   Please submit a full bug report,
>>   with preprocessed source if appropriate.
>>   Please include the complete backtrace with any bug report.
>>   See <http://gcc.gnu.org/bugs.html> for instructions.
>>   make[2]: *** [drivers/target/target_core_pr.o] Error 1
>>   make[1]: *** [drivers/target] Error 2
>>   make: *** [drivers] Error 2
> 
> Can these issues be reproduced with the lastest gcc version?  If so,
> can you provide preprocessed source of the testcases and the compiler
> flags to trigger the ICEs?
> 
> 

OK, thanks, I will/should try, hope I can finish within this month
(2013-10-31).

Thanks.
-- 
Chen Gang
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