I have built a Win32 ppcrossarm.exe (2.20) compiler. The compiler works ok. The output from the Linux and the Win32 compiler when I use the -sh directive is exactly the same. The downside is I have some problems finding a Win32 linker that I can use.

If I compile a Hallow World program, it works ok, but when I try to compile a program that uses uLibc, the Win32 linker and the Linux linker dos not do exactly the same.

When I run the output from the Win32 linker on my arm platform it stops with
Segmentation fault
The output from the Linux linker runs ok

If I look in the map file the only difference I can see is (see at the end of this mail)

Linux: 0x000080d4 . = (0x8000 + SIZEOF_HEADERS) Win32: 0x00008000 . = 0x8000

I have several versions of Win32 linkers (215,216,217) and Linux linkers (215,216,217,218). I have also seen this problem with a Linux linker (217)

One of the Win32 linkers I have used if from
ftp://ftp.freepascal.org/pub/fpc/contrib/cross/mingw/binutils-2.15.94-win32- arm-linux.zip

Has anyone got a hint where to go from here.

Regards

Carsten

---------------------- Linux --------------------------------------------- 0x00010000 PROVIDE (__executable_start, 0x10000) 0x00010100 . = 0x10100
0x00008000 PROVIDE (__executable_start, 0x8000) 0x000080d4 . = (0x8000 + SIZEOF_HEADERS)

.interp 0x000080d4 0x13
*(.interp)
.interp 0x000080d4 0x13 /Fpc/Lib/Ulibc/Arm/cprt0.o *(.interp)

.hash 0x000080e8 0x94
*(.hash)
.hash 0x000080e8 0x94 /Fpc/Lib/Ulibc/Arm/cprt0.o *(.hash)

.dynsym 0x0000817c 0x120
*(.dynsym)
.dynsym 0x0000817c 0x120 /Fpc/Lib/Ulibc/Arm/cprt0.o *(.dynsym)

.dynstr 0x0000829c 0xc4
*(.dynstr)
.dynstr 0x0000829c 0xc4 /Fpc/Lib/Ulibc/Arm/cprt0.o *(.dynstr)

.gnu.version
*(.gnu.version)
*(.gnu.version)

.gnu.version_d
*(.gnu.version_d)
*(.gnu.version_d)

.gnu.version_r
*(.gnu.version_r)
*(.gnu.version_r)

.rel.dyn 0x00008360 0x18
*(.rel.init)
*(.rel.text .rel.text.* .rel.gnu.linkonce.t.*)
*(.rel.fini)
*(.rel.rodata .rel.rodata.* .rel.gnu.linkonce.r.*) *(.rel.data.rel.ro*)
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*(.rel.tdata .rel.tdata.* .rel.gnu.linkonce.td.*)
*(.rel.tbss .rel.tbss.* .rel.gnu.linkonce.tb.*)
*(.rel.ctors)
*(.rel.dtors)
*(.rel.got)
.rel.got 0x00008360 0x18 /Fpc/Lib/Ulibc/Arm/cprt0.o *(.rel.bss .rel.bss.* .rel.gnu.linkonce.b.*)
*(.rel.init)
*(.rel.text .rel.text.* .rel.gnu.linkonce.t.*)

---------------------- Win32 -------------------------------------------------- 0x00010000 PROVIDE (__executable_start, 0x10000) 0x00010100 . = 0x10100
0x00008000 PROVIDE (__executable_start, 0x8000) 0x00008000 . = 0x8000

.interp 0x00008000 0x13
*(.interp)
.interp 0x00008000 0x13 J:\Fpc\Lib\Ulibc\Arm\cprt0.o *(.interp)

.hash 0x00008014 0x90
*(.hash)
.hash 0x00008014 0x90 J:\Fpc\Lib\Ulibc\Arm\cprt0.o *(.hash)

.dynsym 0x000080a4 0x110
*(.dynsym)
.dynsym 0x000080a4 0x110 J:\Fpc\Lib\Ulibc\Arm\cprt0.o *(.dynsym)

.dynstr 0x000081b4 0xbb
*(.dynstr)
.dynstr 0x000081b4 0xbb J:\Fpc\Lib\Ulibc\Arm\cprt0.o *(.dynstr)

.gnu.version 0x00008270 0x0
*(.gnu.version)
*(.gnu.version)

.gnu.version_d 0x00008270 0x0
*(.gnu.version_d)
*(.gnu.version_d)

.gnu.version_r 0x00008270 0x0
*(.gnu.version_r)
*(.gnu.version_r)

.rel.dyn 0x00008270 0x18
*(.rel.init)
*(.rel.text .rel.text.* .rel.gnu.linkonce.t.*)
*(.rel.fini)
*(.rel.rodata .rel.rodata.* .rel.gnu.linkonce.r.*) *(.rel.data.rel.ro* .rel.gnu.linkonce.d.rel.ro.*)
*(.rel.data .rel.data.* .rel.gnu.linkonce.d.*)
*(.rel.tdata .rel.tdata.* .rel.gnu.linkonce.td.*)
*(.rel.tbss .rel.tbss.* .rel.gnu.linkonce.tb.*)
*(.rel.ctors)
*(.rel.dtors)
*(.rel.got)
.rel.got 0x00008270 0x18 J:\Fpc\Lib\Ulibc\Arm\cprt0.o *(.rel.bss .rel.bss.* .rel.gnu.linkonce.b.*)
*(.rel.init)
*(.rel.text .rel.text.* .rel.gnu.linkonce.t.*)

Did you load it in GDB? Where does it exactly crash?

I guess it is linker script related. Unfortunatly FPC comes with an integrated linker script however it seems there is no generic one.

Try to compare the various linker scripts to narrow it down. From ld you get it with
ld --verbose

From FPC you get it when compiling with -s:

it's the SECTIONS { ... }part of the resulting link.res

The scripts (.res files) produced by the Linux compiler and the win32 compiler are 100% the same.

The output form the 2 linkers are deferent but what it means ?? Again the first thing that is different is the line

Linux   PROVIDE (__executable_start = 0x00008000); . =0x00008000+SIZEOF_HEADERS;
Win32 PROVIDE (__executable_start = 0x8000); . = 0x8000;

My conclusion is, the problem is the win32 linker, but is there a way I can get it to behave like the Linux linker.

Regards
Carsten

----------------------------------- The Win32 Linker ---------------------------------------

GNU ld version 2.16.91 20060320
Supported emulations:
armelf
using internal linker script:
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OUTPUT_ARCH(arm)
ENTRY(_start)
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================================================== attempt to open link.res succeeded
opened script file link.res
attempt to open J:\Fpc\Lib\Ulibc\Arm\cprt0.o succeeded J:\Fpc\Lib\Ulibc\Arm\cprt0.o
attempt to open hw.o succeeded
-
-
-

----------------------------------- The Linux Linker ----------------------------------------------- GNU ld version 2.16.1
Supported emulations:
armelf_linux
armelf
using internal linker script:
================================================== /* Script for -z combreloc: combine and sort reloc sections */ OUTPUT_FORMAT("elf32-littlearm", "elf32-bigarm",
"elf32-littlearm")
OUTPUT_ARCH(arm)
ENTRY(_start)
SEARCH_DIR("/root/arm-linux-gcc//arm-linux-uclibc/lib"); /* Do we need any of these for elf?
__DYNAMIC = 0; */
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================================================== attempt to open link.res succeeded
opened script file link.res
attempt to open /Fpc/Lib/Ulibc/Arm/cprt0.o succeeded /Fpc/Lib/Ulibc/Arm/cprt0.o
attempt to open hw.o succeeded

-
-
-

- try to compare FPC's linker script with one of a working ld
- try to find differences using objdump