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Endre



Joined: 29 Dec 2003
Posts: 215
Location: Budapest, Hungary
Endre 03 Jul 2013, 09:06
sleepsleep wrote:
thanks Endre,
doesnt work still =(


Interessting, because it works for me. But there are some differences between our systems:
1. I use libc instead of uClibc,
2. I have no 32bit systems but 64bit ones on which I installed also 32bit libraries,
3. My systems are linux mint (ubuntu)
With these configurations and having int 0x80 commented out, your program is working for me.
Post 03 Jul 2013, 09:06
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sleepsleep



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sleepsleep 03 Jul 2013, 09:22
hi Endre,
thanks for the confirmation,
am still struggle with this issue,

it is still unsolved in my environment,

i will attempt to buildroot, still finding how to do this stuff,
Post 03 Jul 2013, 09:22
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Turbo Lover



Joined: 22 Feb 2013
Posts: 32
Turbo Lover 03 Jul 2013, 09:31
why is it DYN?
Post 03 Jul 2013, 09:31
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sleepsleep



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sleepsleep 03 Jul 2013, 09:43
no idea too, maybe i need to study linux executable format, "(
Post 03 Jul 2013, 09:43
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Endre



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Endre 03 Jul 2013, 14:45
What if you link it statically (e.g. with compiler switch -static)?
Post 03 Jul 2013, 14:45
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sleepsleep



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sleepsleep 03 Jul 2013, 16:54
Endre wrote:
What if you link it statically (e.g. with compiler switch -static)?


hi Endre,
static link working! Smile

i use gcc -static fasmoutput.o -o executablename
as suggested by you,

this is great!
Post 03 Jul 2013, 16:54
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Bob++



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Bob++ 03 Jul 2013, 17:55
I'm not familiar with this linux stuff, but what error do you get?
Post 03 Jul 2013, 17:55
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sleepsleep



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sleepsleep 03 Jul 2013, 17:58
Bob++ wrote:
I'm not familiar with this linux stuff, but what error do you get?

Can't modify application's text section; use the GCC option -fPIE for position-independent executables.

actually i got no idea what error is that,
but execution of that executable bring the above error message.

-static as suggested works fine, but dynamic load doesnt work.
Post 03 Jul 2013, 17:58
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Endre



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Endre 04 Jul 2013, 10:50
Then to counter check whether fasm generates proper elf object compile the following code (I implemented you the ccall macro. The file name is assumed to be a1.S) with "as". That is

gcc -g a1.S -o a1

(-g is for debug info, so you can debug your code with gdb)

Code:
.altmacro
.macro ccall func:req, args:vararg
        local argc
        argc = 0

        /* recursive reverse pusher */
        .macro pusher parg1, pargs:vararg
            .ifnb \parg1
                /* .print  "\parg1" */
                pusher  \pargs
                push    \parg1
                argc = argc + 1
            .endif
        .endm

        pusher  \args
        call    \func
        /* check if there were arguments pushed */
        .if \argc
                add     esp, argc * 4
        .endif
        .purgem pusher
.endm

        .intel_syntax noprefix
        .global main
        .extern getpid
        .extern printf

        .text
        .align 4
main:
        ccall   getpid
        ccall   printf (offset msg), eax
        mov     eax, 1
        /* int  0x80 */
        ret

msg:
        .asciz "hello world %d\n"


if it works, then something is wrong with fasm on your system.
Post 04 Jul 2013, 10:50
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sleepsleep



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sleepsleep 04 Jul 2013, 19:57
it doesnt works,
same error after i did gcc -g a1.S -o a1
Can't modify application's text section; use the GCC option -fPIE for position-independent executables.
Post 04 Jul 2013, 19:57
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Endre



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Endre 05 Jul 2013, 08:05
Then this must be a feature of alpine linux. I have one more idea, but I doubt it works: try to apply compiler switch -muclibc. I don't know too much about uClibc, but as I remember one has to use a special linker for linking on it. Probably this linker (ld-uclibc or what) has been installed on your system. So my experiment would test whether the compiler chooses the right linker if you add the compiler switch above. You may want to use the switch -v to get more info from the compiler. As a counter-test there is another switch named -mglibc which you can also attempt to use just to check if linking against glibc works.
Post 05 Jul 2013, 08:05
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gens



Joined: 18 Feb 2013
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gens 05 Jul 2013, 12:57
sleep stated the output of ldd

checking sub-depends for '/lib/libc.so.0.9.32'
checking sub-depends for '/lib/ld-uClibc.so.0.9.32'

im guessing its a problem with uclibc or gcc having problems with uclibc
did you try some C programs ?
how about some other calls like write() ?

position independent whatever is when you are making a library, they should not be needed to call a library
maybe its just passing a wrong pointer, 32bit calls return to the stack
try setting up the stack, maybe the stack pointers are messed up
http://en.wikipedia.org/wiki/X86_calling_conventions#Caller_clean-up

bdw you can use latrace, strace and gdb to find out whats wrong
and if all else fails you can make it in C then decompile it
Post 05 Jul 2013, 12:57
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sleepsleep



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sleepsleep 05 Jul 2013, 13:11
gens wrote:
sleep stated the output of ldd

checking sub-depends for '/lib/libc.so.0.9.32'
checking sub-depends for '/lib/ld-uClibc.so.0.9.32'

im guessing its a problem with uclibc or gcc having problems with uclibc
did you try some C programs ?
how about some other calls like write() ?

position independent whatever is when you are making a library, they should not be needed to call a library
maybe its just passing a wrong pointer, 32bit calls return to the stack
try setting up the stack, maybe the stack pointers are messed up
http://en.wikipedia.org/wiki/X86_calling_conventions#Caller_clean-up

bdw you can use latrace, strace and gdb to find out whats wrong
and if all else fails you can make it in C then decompile it


thanks for tips,
i will try to see how to solve this mystery, (am still a linux newbie)
Post 05 Jul 2013, 13:11
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Endre



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Endre 05 Jul 2013, 17:00
Have you already tried -muclibc?
Post 05 Jul 2013, 17:00
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sleepsleep



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sleepsleep 05 Jul 2013, 17:27
i tried the following, Endre,
using the code.S as suggested by you to unveil da mysteries,

Code:
sleepserver:/# gcc -g -v -muclibc a1.S -o a1
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/i486-alpine-linux-uclibc/4.7.3/lto-wrapper
Target: i486-alpine-linux-uclibc
Configured with: /home/buildozer/aports/main/gcc/src/gcc-4.7.3/configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --build=i486-alpine-linux-uclibc --host=i486-alpine-linux-uclibc --target=i486-alpine-linux-uclibc --with-pkgversion='Alpine 4.7.3' --disable-altivec --disable-build-with-cxx --disable-checking --disable-fixed-point --disable-libssp --disable-libstdcxx-pch --disable-multilib --disable-nls --disable-werror --enable-__cxa_atexit --enable-cld --enable-esp --enable-cloog-backend --enable-languages=c,c++,objc,java,go,fortran --enable-shared --enable-target-optspace --enable-tls --enable-threads --with-dynamic-linker=ld-uClibc.so.0.9.32 --with-dynamic-linker-prefix=/lib --with-system-zlib --without-system-libunwind
Thread model: posix
gcc version 4.7.3 (Alpine 4.7.3)
COLLECT_GCC_OPTIONS='-g' '-v' '-muclibc' '-o' 'a1' '-mtune=i486' '-march=i486' '-fPIE' '-pie'
 /usr/libexec/gcc/i486-alpine-linux-uclibc/4.7.3/cc1 -E -lang-asm -quiet -v a1.S -fno-strict-overflow -muclibc -mtune=i486 -march=i486 -fPIE -g -fworking-directory -fstack-protector-all -fno-directives-only -o /tmp/ccT5TnL8.s
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory "/usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/../../../../i486-alpine-linux-uclibc/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/include
 /usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/include-fixed
 /usr/include
End of search list.
COLLECT_GCC_OPTIONS='-g' '-v' '-muclibc' '-o' 'a1' '-mtune=i486' '-march=i486' '-fPIE' '-pie'
 /usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/../../../../i486-alpine-linux-uclibc/bin/as --gdwarf2 -v --32 -o /tmp/cciRrhP5.o /tmp/ccT5TnL8.s
GNU assembler version 2.23.2 (i486-alpine-linux-uclibc) using BFD version (GNU Binutils) 2.23.2
COMPILER_PATH=/usr/libexec/gcc/i486-alpine-linux-uclibc/4.7.3/:/usr/libexec/gcc/i486-alpine-linux-uclibc/4.7.3/:/usr/libexec/gcc/i486-alpine-linux-uclibc/:/usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/:/usr/lib/gcc/i486-alpine-linux-uclibc/:/usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/../../../../i486-alpine-linux-uclibc/bin/
LIBRARY_PATH=/usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/:/usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/../../../../i486-alpine-linux-uclibc/lib/:/usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-g' '-v' '-muclibc' '-o' 'a1' '-mtune=i486' '-march=i486' '-fPIE' '-pie'
 /usr/libexec/gcc/i486-alpine-linux-uclibc/4.7.3/collect2 --eh-frame-hdr -m elf_i386 -dynamic-linker /lib/ld-uClibc.so.0.9.32 -pie -z now -o a1 /usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/../../../Scrt1.o /usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/../../../crti.o /usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/crtbeginS.o -L/usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3 -L/usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/../../../../i486-alpine-linux-uclibc/lib -L/usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/../../.. /tmp/cciRrhP5.o -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed /usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/crtendS.o /usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/../../../crtn.o



Code:
sleepserver:/# gcc -g -v -mglibc a1.S -o a1
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/i486-alpine-linux-uclibc/4.7.3/lto-wrapper
Target: i486-alpine-linux-uclibc
Configured with: /home/buildozer/aports/main/gcc/src/gcc-4.7.3/configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --build=i486-alpine-linux-uclibc --host=i486-alpine-linux-uclibc --target=i486-alpine-linux-uclibc --with-pkgversion='Alpine 4.7.3' --disable-altivec --disable-build-with-cxx --disable-checking --disable-fixed-point --disable-libssp --disable-libstdcxx-pch --disable-multilib --disable-nls --disable-werror --enable-__cxa_atexit --enable-cld --enable-esp --enable-cloog-backend --enable-languages=c,c++,objc,java,go,fortran --enable-shared --enable-target-optspace --enable-tls --enable-threads --with-dynamic-linker=ld-uClibc.so.0.9.32 --with-dynamic-linker-prefix=/lib --with-system-zlib --without-system-libunwind
Thread model: posix
gcc version 4.7.3 (Alpine 4.7.3)
COLLECT_GCC_OPTIONS='-g' '-v' '-mglibc' '-o' 'a1' '-mtune=i486' '-march=i486' '-fPIE' '-pie'
 /usr/libexec/gcc/i486-alpine-linux-uclibc/4.7.3/cc1 -E -lang-asm -quiet -v a1.S -fno-strict-overflow -mglibc -mtune=i486 -march=i486 -fPIE -g -fworking-directory -fstack-protector-all -fno-directives-only -o /tmp/ccmN2lyH.s
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory "/usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/../../../../i486-alpine-linux-uclibc/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/include
 /usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/include-fixed
 /usr/include
End of search list.
COLLECT_GCC_OPTIONS='-g' '-v' '-mglibc' '-o' 'a1' '-mtune=i486' '-march=i486' '-fPIE' '-pie'
 /usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/../../../../i486-alpine-linux-uclibc/bin/as --gdwarf2 -v --32 -o /tmp/cc6f9bmf.o /tmp/ccmN2lyH.s
GNU assembler version 2.23.2 (i486-alpine-linux-uclibc) using BFD version (GNU Binutils) 2.23.2
COMPILER_PATH=/usr/libexec/gcc/i486-alpine-linux-uclibc/4.7.3/:/usr/libexec/gcc/i486-alpine-linux-uclibc/4.7.3/:/usr/libexec/gcc/i486-alpine-linux-uclibc/:/usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/:/usr/lib/gcc/i486-alpine-linux-uclibc/:/usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/../../../../i486-alpine-linux-uclibc/bin/
LIBRARY_PATH=/usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/:/usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/../../../../i486-alpine-linux-uclibc/lib/:/usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-g' '-v' '-mglibc' '-o' 'a1' '-mtune=i486' '-march=i486' '-fPIE' '-pie'
 /usr/libexec/gcc/i486-alpine-linux-uclibc/4.7.3/collect2 --eh-frame-hdr -m elf_i386 -dynamic-linker /lib/ld-uClibc.so.0.9.32 -pie -z now -o a1 /usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/../../../Scrt1.o /usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/../../../crti.o /usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/crtbeginS.o -L/usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3 -L/usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/../../../../i486-alpine-linux-uclibc/lib -L/usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/../../.. /tmp/cc6f9bmf.o -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed /usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/crtendS.o /usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/../../../crtn.o
Post 05 Jul 2013, 17:27
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sleepsleep



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sleepsleep 05 Jul 2013, 17:42
i hope this info is useful,
Code:
format elf
include '/fasm/examples/libcdemo/ccall.inc'


section '.text' executable
public main
extrn getpid
extrn printf
main:
        call    getpid
        ccall   printf,msg,eax
        ret

section '.data' writeable
msg db 'hello world %d',0


Code:
sleepserver:/# fasm a2.asm
sleepserver:/# gcc -v a2.o -o a2
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/i486-alpine-linux-uclibc/4.7.3/lto-wrapper
Target: i486-alpine-linux-uclibc
Configured with: /home/buildozer/aports/main/gcc/src/gcc-4.7.3/configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --build=i486-alpine-linux-uclibc --host=i486-alpine-linux-uclibc --target=i486-alpine-linux-uclibc --with-pkgversion='Alpine 4.7.3' --disable-altivec --disable-build-with-cxx --disable-checking --disable-fixed-point --disable-libssp --disable-libstdcxx-pch --disable-multilib --disable-nls --disable-werror --enable-__cxa_atexit --enable-cld --enable-esp --enable-cloog-backend --enable-languages=c,c++,objc,java,go,fortran --enable-shared --enable-target-optspace --enable-tls --enable-threads --with-dynamic-linker=ld-uClibc.so.0.9.32 --with-dynamic-linker-prefix=/lib --with-system-zlib --without-system-libunwind
Thread model: posix
gcc version 4.7.3 (Alpine 4.7.3)
COMPILER_PATH=/usr/libexec/gcc/i486-alpine-linux-uclibc/4.7.3/:/usr/libexec/gcc/i486-alpine-linux-uclibc/4.7.3/:/usr/libexec/gcc/i486-alpine-linux-uclibc/:/usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/:/usr/lib/gcc/i486-alpine-linux-uclibc/:/usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/../../../../i486-alpine-linux-uclibc/bin/
LIBRARY_PATH=/usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/:/usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/../../../../i486-alpine-linux-uclibc/lib/:/usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-o' 'a2' '-mtune=i486' '-march=i486' '-fPIE' '-pie'
 /usr/libexec/gcc/i486-alpine-linux-uclibc/4.7.3/collect2 --eh-frame-hdr -m elf_i386 -dynamic-linker /lib/ld-uClibc.so.0.9.32 -pie -z now -o a2 /usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/../../../Scrt1.o /usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/../../../crti.o /usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/crtbeginS.o -L/usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3 -L/usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/../../../../i486-alpine-linux-uclibc/lib -L/usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/../../.. a2.o -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed /usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/crtendS.o /usr/lib/gcc/i486-alpine-linux-uclibc/4.7.3/../../../crtn.o
Post 05 Jul 2013, 17:42
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sleepsleep



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sleepsleep 05 Jul 2013, 17:43
the generated executables above dont work with error,
Quote:

Can't modify application's text section; use the GCC option -fPIE for position-independent executables.
Post 05 Jul 2013, 17:43
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Endre



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Posts: 215
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Endre 08 Jul 2013, 08:17
I've got no more ideas. Try to ask about it on the Alpine linux forum. As I see Alpine linux is sort of embedded linux, and as such it may need some tweaking to make it fit for your needs. I can imagine that you have to enable/disable something in the kernel in this regard, but I don't know. But I'd be interested in, so if you got to know something then please let us know.
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sleepsleep



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sleepsleep 08 Jul 2013, 19:23
i got posted some question into their new forum and mailing list, no way to push things, gotta wait,

ok, will post updated info regarding this in future if i got found any sort of solutions,

thanks for reply, Endre,. appreciate.
Post 08 Jul 2013, 19:23
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