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* [Bug c/17176] New: internal compiler error on invalid inline assembler code
@ 2004-08-24 20:40 m dot a dot termeer at student dot tue dot nl
2004-08-24 20:46 ` [Bug c/17176] " pinskia at gcc dot gnu dot org
0 siblings, 1 reply; 2+ messages in thread
From: m dot a dot termeer at student dot tue dot nl @ 2004-08-24 20:40 UTC (permalink / raw)
To: gcc-bugs
i was trying to get a stack dump from a linux program and used some assembler to
do the trick. when compiling the following code
#include <stdio.h>
main() {
char *stackptr;
__asm__("movl %esp,%%eax" : "=eax"(stackptr) : : "eax");
return 0;
}
with "gcc stack_crash.c" causes the output
dec@dec:~$ gcc stack_crash.c
stack_crash.c: In function `main':
stack_crash.c:20: Internal compiler error in instantiate_virtual_regs_1, at
function.c:3971
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.
this is gcc version 3.2.3, or more complete, the output of gcc -v:
dec@dec:~$ gcc -v
Reading specs from /usr/lib/gcc-lib/i486-slackware-linux/3.2.3/specs
Configured with: ../gcc-3.2.3/configure --prefix=/usr --enable-shared
--enable-threads=posix --enable-__cxa_atexit --disable-checking --with-gnu-ld
--verbose --target=i486-slackware-linux --host=i486-slackware-linux
Thread model: posix
gcc version 3.2.3
to fix the problem, i upgraded my gcc version to 3.3.3 and now i get the
following output.
stack_crash.c: In function `main':
stack_crash.c:5: error: impossible constraint in `asm'
with gcc -v being
Reading specs from /usr/lib/gcc-lib/i486-pc-linux-gnu/3.3.3/specs
Configured with: /var/tmp/portage/gcc-3.3.3-r6/work/gcc-3.3.3/configure
--prefix=/usr --bindir=/usr/i486-pc-linux-gnu/gcc-bin/3.3
--includedir=/usr/lib/gcc-lib/i486-pc-linux-gnu/3.3.3/include
--datadir=/usr/share/gcc-data/i486-pc-linux-gnu/3.3
--mandir=/usr/share/gcc-data/i486-pc-linux-gnu/3.3/man
--infodir=/usr/share/gcc-data/i486-pc-linux-gnu/3.3/info --enable-shared
--host=i486-pc-linux-gnu --target=i486-pc-linux-gnu --with-system-zlib
--enable-languages=c,c++ --enable-threads=posix --enable-long-long
--disable-checking --disable-libunwind-exceptions --enable-cstdio=stdio
--enable-version-specific-runtime-libs
--with-gxx-include-dir=/usr/lib/gcc-lib/i486-pc-linux-gnu/3.3.3/include/g++-v3
--with-local-prefix=/usr/local --enable-shared --enable-nls
--without-included-gettext --disable-multilib --enable-__cxa_atexit
--enable-clocale=generic
Thread model: posix
gcc version 3.3.3 20040412 (Gentoo Linux 3.3.3-r6, ssp-3.3.2-2, pie-8.7.6)
so actually, this bug is already fixed. but i just felt like submitting it.
by the way, the correct asm code turned out to be
unsigned char *stackptr = (unsigned char *)&stackptr;
asm ("movl %%esp, %0\n" :"=r"(stackptr));
which works with both versions of gcc.
the bug was present on various linux systems, with different distributions,
processors and such.
--
Summary: internal compiler error on invalid inline assembler code
Product: gcc
Version: 3.2.3
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: m dot a dot termeer at student dot tue dot nl
CC: gcc-bugs at gcc dot gnu dot org
GCC host triplet: various linux systems
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17176
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug c/17176] internal compiler error on invalid inline assembler code
2004-08-24 20:40 [Bug c/17176] New: internal compiler error on invalid inline assembler code m dot a dot termeer at student dot tue dot nl
@ 2004-08-24 20:46 ` pinskia at gcc dot gnu dot org
0 siblings, 0 replies; 2+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2004-08-24 20:46 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-08-24 20:46 -------
Yes we know it was fixed, there are already many bug reports about this failure, See PR7916, 9181, and
others.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |FIXED
Target Milestone|--- |3.3.3
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17176
^ permalink raw reply [flat|nested] 2+ messages in thread
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2004-08-24 20:40 [Bug c/17176] New: internal compiler error on invalid inline assembler code m dot a dot termeer at student dot tue dot nl
2004-08-24 20:46 ` [Bug c/17176] " pinskia at gcc dot gnu dot org
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