[Bug target/37954] odd sized packed structures passed by value, under ARM, cause lockup of application
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=37954 Bug 37954 depends on bug 36043, which changed state. Bug 36043 Summary: gcc reads 8 bytes for a struct of size 6 which leads to sigsegv https://gcc.gnu.org/bugzilla/show_bug.cgi?id=36043 What|Removed |Added Status|ASSIGNED|RESOLVED Resolution|--- |FIXED
[Bug target/37954] odd sized packed structures passed by value, under ARM, cause lockup of application
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=37954 Ramana Radhakrishnan ramana at gcc dot gnu.org changed: What|Removed |Added Status|NEW |RESOLVED CC||ramana at gcc dot gnu.org Resolution|--- |FIXED Target Milestone|--- |4.4.0 --- Comment #15 from Ramana Radhakrishnan ramana at gcc dot gnu.org --- Fixed. ... Wont fix on the 4.3 branch which is now long dead.
[Bug target/37954] odd sized packed structures passed by value, under ARM, cause lockup of application
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37954 Richard Guenther rguenth at gcc dot gnu.org changed: What|Removed |Added Target Milestone|4.3.6 |---
[Bug target/37954] odd sized packed structures passed by value, under ARM, cause lockup of application
--- Comment #13 from mikpe at it dot uu dot se 2009-10-23 12:49 --- Created an attachment (id=18879) -- (http://gcc.gnu.org/bugzilla/attachment.cgi?id=18879action=view) backport of r141742 to gcc-4.3.4 that I'm testing -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37954
[Bug target/37954] odd sized packed structures passed by value, under ARM, cause lockup of application
--- Comment #11 from mikpe at it dot uu dot se 2009-10-22 17:55 --- Created an attachment (id=18869) -- (http://gcc.gnu.org/bugzilla/attachment.cgi?id=18869action=view) reduced test case in plain C -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37954
[Bug target/37954] odd sized packed structures passed by value, under ARM, cause lockup of application
--- Comment #12 from mikpe at it dot uu dot se 2009-10-23 00:29 --- The ARM misalignment bug in this PR was fixed for gcc-4.4 by r141742, an apparently ia64- and Ada-motivated generic patch. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37954
[Bug target/37954] odd sized packed structures passed by value, under ARM, cause lockup of application
--- Comment #6 from maurice35 dot david at laposte dot net 2009-10-21 09:36 --- Created an attachment (id=18854) -- (http://gcc.gnu.org/bugzilla/attachment.cgi?id=18854action=view) Screen shoot form lauterbach -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37954
[Bug target/37954] odd sized packed structures passed by value, under ARM, cause lockup of application
--- Comment #7 from maurice35 dot david at laposte dot net 2009-10-21
09:37 ---
It seems that I have a similar issue with ccmips compilator :
typedef struct
{
char A;
char B;
char C;
/*char padding;*/
} tStructABC;
typedef struct
{
tStructABC ABC1;
tStructABC ABC2;
} tStruct2ABC;
tStruct2ABC Struct2ABC;
int Compute(tStructABC ArgA,tStructABC ArgB)
{
return(ArgA.A+ArgA.B);
}
int main(int argc, char *argv[])
{
tStructABC * pABC1;
tStructABC * pABC2;
pABC1 = (Struct2ABC.ABC1);
pABC2 = (Struct2ABC.ABC2);
printf(Compute=%d\n,Compute(*pABC1,*pABC2));
}
This code crash with the printout:
Address load Exception
Exception Program Counter: 0x803f56f8
Status Register: 0x3000ff01
Cause Register: 0x0010
Access Address : 0x80b8da83
Task: 0x80ffa440 PGL_Main
0x80ffa440 (PGL_Main): task 0x80ffa440 has had a failure and has been stopped.
0x80ffa440 (PGL_Main): fatal kernel task-level exception!
So The crash is due to an alignment issue on the address (Struct2ABC.ABC2);.
To avoid this issue we need to add a padding byte in tStructABC because it
seems that there is no way to force a padding through a compilation option or
through a #pragma (as example #pragma pack(4)).
Please could you confirm this issue in compilation sw (ccmips) or not.
see: Created an attachment (id=18854)
-- (http://gcc.gnu.org/bugzilla/attachment.cgi?id=18854action=view) [edit]
Screen shoot form lauterbach
Best regard,
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37954
[Bug target/37954] odd sized packed structures passed by value, under ARM, cause lockup of application
--- Comment #8 from mikpe at it dot uu dot se 2009-10-21 12:19 --- I can reproduce the misalignment exceptions on armv5tel-linux-gnueabi with gcc-4.3.4 at -O0 but not with gcc-4.4.2. The loop in main() which iterates over the packed array creates a misaligned pointer from which it performs word-sized loads, which causes misalignment exceptions. gcc-4.4.2 generates very different code which doesn't make assumptions about alignment. -- mikpe at it dot uu dot se changed: What|Removed |Added CC||mikpe at it dot uu dot se http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37954
[Bug target/37954] odd sized packed structures passed by value, under ARM, cause lockup of application
--- Comment #9 from maurice35 dot david at laposte dot net 2009-10-21 14:46 --- My version is: [r...@ build]# ccmips -V ccmips: `-V' option must have argument [r...@pace build]# ccmips --version ccmips (GCC) 3.3.2 20030904 (Wind River vxworks61) (built 20050516) Copyright (C) 2003 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. -- maurice35 dot david at laposte dot net changed: What|Removed |Added CC||maurice35 dot david at ||laposte dot net http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37954
[Bug target/37954] odd sized packed structures passed by value, under ARM, cause lockup of application
--- Comment #10 from mikpe at it dot uu dot se 2009-10-21 19:47 --- (In reply to comment #9) My version is: [r...@ build]# ccmips -V ccmips: `-V' option must have argument [r...@pace build]# ccmips --version ccmips (GCC) 3.3.2 20030904 (Wind River vxworks61) (built 20050516) Copyright (C) 2003 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. That's an old vendor-modified compiler based on an ancient and no longer supported gcc version. Please direct your questions about that compiler to the vendor, Wind River. If you can reproduce your MIPS alignment problem using gcc-4.3 or newer, then that's something you should report here in a new bugzilla entry (so as to not confuse this ARM problem with a possibly unrelated MIPS problem). -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37954
