compile zImage give different binary file in 32bit and 64bit system

Alan Post alanpost at sunflowerriver.org
Fri Sep 24 22:49:13 EDT 2010


Well,

those two are the same at least.

-Alan

On Sat, Sep 25, 2010 at 10:40:05AM +0800, Xiangfu Liu wrote:
> Hi 
> 
> the hello.c is the create the same binary:
> compile by "mipsel-openwrt-linux-gcc hello.c -o hello"
> 
> http://www.openmobilefree.net/other/downloads/tmp/hello.32bit/
> http://www.openmobilefree.net/other/downloads/tmp/hello.64bit/
> 
> On 09/24/2010 10:28 PM, Alan Post wrote:
> > That is troubling.
> > 
> > Can you compile:
> > 
> > <++> hello.c
> > #include <stdlib.h>
> > #include <stdio.h>
> > 
> > int main(int argc, char *argv[])
> > {
> >   printf("%s\n", "hello, world")
> >   exit(0);
> > }
> > <-->
> > 
> > And compare the object file created as well as the executable
> > created? 
> > 
> > I'd like to know if the linker is doing something funny or if
> > it is the compiler.  I suspect it is the compiler, from the
> > error message you get below.
> > 
> > Assuming that, we'd be able to figure out what is different by
> > writing programs that access structs, do weird things with memory
> > alignment, or just do some register rearrangement.
> > 
> > -Alan
> > 
> > On Fri, Sep 24, 2010 at 09:44:24PM +0800, Xiangfu Liu wrote:
> >> Hi all
> >>
> >> I have compiled the zImage in openwrt-xburst.git in 
> >> two different system: 32bit and 64bit
> >>
> >> then use hexdump dump the zImage.bin file.
> >> use diff to check two hexdump text file.
> >> there are a lot of different.
> >>
> >> is that normal??
> >> why it's give different binary file in 32bit and 64bit system.
> >>
> >>
> >> for example:
> >> use current config.xbboot file:
> >>
> >> compile in 64bit system it works fine.
> >> compile in 32bit system. it give me :
> >> CPU 0 Unable to handle kernel paging request at virtual address 59c54040, epc == 8005c708, ra == 8008058c
> >> (see attach for detail message)
> >>
> >>
> 
> -- 
> Best Regards
> Xiangfu Liu
> http://www.nanonote.cc
> 
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