'int main () {return (0);의 부동 소수점 예외 (SIGFPE)

'int main () {return (0);의 부동 소수점 예외 (SIGFPE) } '

---

두 가지 다른 Linux 환경을위한 간단한 C 프로그램을 구축하려고합니다. 한 장치에서는 프로그램이 제대로 실행되고 다른 장치에서는 프로그램이 부동 소수점 예외를 생성합니다. 이 프로그램은 메인에서 0을 반환합니다. 이로 인해 시작 코드와 ABI가 호환되지 않는다고 믿게됩니다.

이 프로그램은 다음 빌드 사양으로 gcc로 컴파일됩니다.

기본 제공 사양 사용. 대상 : i386-redhat-linux 구성 : ../configure --prefix = / usr --mandir = / usr / share / man --infodir = / usr / share / info --enable-shared --enable-threads = posix --enable-checking = release --with-system-zlib --enable -__ cxa_atexit --disable-libunwind-exceptions --enable-libgcj-multifile --enable-languages ​​= c, c ++, objc, obj-c ++ , java, fortran, ada --enable-java-awt = gtk --disable-dssi --disable-plugin --with-java-home = / usr / lib / jvm / java-1.4.2-gcj-1.4. 2.0 / jre --with-cpu = generic --host = i386-redhat-linux 스레드 모델 : posix gcc 버전 4.1.2 20080704 (Red Hat 4.1.2-52)

프로그램 소스는 다음과 같습니다.

int main()
{
        return(0);
}

Celeron 장치에서이 프로그램은 GDB에서 다음을 생성합니다.

[root@n00200C30AA2F jrn]# /jrn/gdb fail GNU gdb Red Hat Linux (5.3post-0.20021129.18rh) (gdb) run Starting program: /jrn/fail 

Program received signal SIGFPE, Arithmetic exception. 0x40001cce in ?? () (gdb) bt
#0  0x40001cce in ?? ()
#1  0x4000c6b0 in ?? ()
#2  0x40000cb5 in ?? ()

다음은 무슨 일이 일어나고 있는지 알아 내기 위해 수집 할 수있는 세부 정보입니다.

CELERON:  ( fails on this device )
2.6.8 #21 Mon Oct 1 11:41:47 PDT 2007 i686 i686 i386 GNU/Linux
============
[root@n00200C30AA2F proc]# cat cpuinfo 
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 9
model name      : Intel(R) Celeron(R) M processor          600MHz
stepping        : 5
cpu MHz         : 599.925
cache size      : 512 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 2
wp              : yes
flags           : fpu vme de pse tsc msr mce cx8 sep mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 tm pbe
bogomips        : 1179.64

GNU C Library stable release version 2.3.2, by Roland McGrath et al.
Compiled by GNU CC version 3.2.2 20030222 (Red Hat Linux 3.2.2-5).
Compiled on a Linux 2.4.20 system on 2003-03-13.
Available extensions:
        GNU libio by Per Bothner
        crypt add-on version 2.1 by Michael Glad and others
        linuxthreads-0.10 by Xavier Leroy
        BIND-8.2.3-T5B
        libthread_db work sponsored by Alpha Processor Inc
        NIS(YP)/NIS+ NSS modules 0.19 by Thorsten Kukuk

ATOM:  ( works fine on this device )
2.6.35 #25 SMP Mon Mar 12 09:02:45 PDT 2012 i686 i686 i386 GNU/Linux
==========
[root@n00E04B36ECE5 ~]# cat /proc/cpuinfo 
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 28
model name      : Genuine Intel(R) CPU N270   @ 1.60GHz
stepping        : 2
cpu MHz         : 1599.874
cache size      : 512 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 10
wp              : yes
flags           : fpu vme de tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx constant_tsc up arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl est tm2 ssse3 xtpr pdcm movbe lahf_lm
bogomips        : 3199.74
clflush size    : 64
cache_alignment : 64
address sizes   : 32 bits physical, 32 bits virtual
power management:


GNU C Library stable release version 2.5, by Roland McGrath et al.
Compiled by GNU CC version 4.1.2 20080704 (Red Hat 4.1.2-44).
Compiled on a Linux 2.6.9 system on 2009-09-02.
Available extensions:
        The C stubs add-on version 2.1.2.
        crypt add-on version 2.1 by Michael Glad and others
        GNU Libidn by Simon Josefsson
        GNU libio by Per Bothner
        NIS(YP)/NIS+ NSS modules 0.19 by Thorsten Kukuk
        Native POSIX Threads Library by Ulrich Drepper et al
        BIND-8.2.3-T5B
        RT using linux kernel aio
Thread-local storage support included.

What can I do to determine what is causing this problem? How about trying to statically link against a certain version of libc?

After failure occurs under GDB I execute:

(gdb) x/1i $eip
0x40001cce:     divl   0x164(%ecx)

(gdb) info reg
eax            0x6c994f 7117135
ecx            0x40012858       1073817688
edx            0x0      0
ebx            0x40012680       1073817216
esp            0xbffff740       0xbffff740
ebp            0xbffff898       0xbffff898
esi            0x8049580        134518144
edi            0x400125cc       1073817036
eip            0x40001cce       0x40001cce
eflags         0x10246  66118
cs             0x73     115
ss             0x7b     123
ds             0x7b     123
es             0x7b     123
fs             0x0      0
gs             0x0      0
(gdb) x/1wx 0x164+$ecx
0x400129bc:     0x00000000
(gdb) 

Based on the help I've received it appears that for some reason the libc startup code is dividing by 0.

The question now is, what is causing this obviously bad behavior? Something must be incompatible with something else?

Assembly output:

[jrn@localhost ~]$ more fail.s
        .file   "fail.c"
        .text
.globl main
        .type   main, @function
main:
        leal    4(%esp), %ecx
        andl    $-16, %esp
        pushl   -4(%ecx)
        pushl   %ebp
        movl    %esp, %ebp
        pushl   %ecx
        movl    $0, %eax
        popl    %ecx
        popl    %ebp
        leal    -4(%ecx), %esp
        ret
        .size   main, .-main
        .ident  "GCC: (GNU) 4.1.2 20080704 (Red Hat 4.1.2-52)"
        .section        .note.GNU-stack,"",@progbits

---

This is going to sound like a really long shot...but can you try the following?

$ readelf -a fail

and look for a GNU_HASH dynamic tag? My guess is that the binary uses GNU_HASH, and your ld.so is too old to understand it. Support for the GNU hash section was added to glibc around 2006, and mainline distros began to be GNU-hash-only around 2007 or 2008. Your Centrino's glibc is from 2003, which predates GNU hashing.

If the ld.so doesn't understand GNU hash, it will try to use the old ELF hash section instead, which is empty. In particular, I suspect your crash is occurring at this line in elf/do-lookup.h:

for (symidx = map->l_buckets[hash % map->l_nbuckets];

Since the linker presumably doesn't understand GNU hashes, l_nbuckets would be 0, resulting in the crash. Note that map is a large structure with around 100 structure elements, and l_nbuckets is around the 90th member of the structure in newer ld.so (0x164 = 4*89, so in older ld.so it is probably precisely this member).

To see if this is conclusively the problem, build with -Wl,--hash-style=sysv or -Wl,--hash-style=both and see if the crash goes away.

---

Since it works on the ATOM but not on the older Celeron, I would think the problem could be with a compiler optimization generating code that the Celeron cannot execute. Try compiling with the flag -O0. Additionally, I would suggest adding -march=i686 to explicitly state the architecture. Also, to help isolate the problem I'd also suggest disabling linking to the C++ runtime and JAVA.

Did you build this test program once and run it on each device, or did you build a different executable for each device? If you are building one executable you may have differing versions of libc, libstdc++ on the two devices or on the devices vs your build machine.

참고URL : https://stackoverflow.com/questions/12570374/floating-point-exception-sigfpe-on-int-main-return0