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Re: [PATCH] fix objcopy PE -> ELF conversion

H.J. Lu wrote:
On Mon, Oct 22, 2007 at 09:02:39PM +0200, Christian Franke wrote:
Objcopy cannot convert pe-i386 to elf32-i386. The offsets of the pc-relative relocation entries are not converted properly.

I need some PE to ELF conversion for the Cygwin port of GRUB2. The first working Cygwin patch for GRUB2 includes a workaround to load the broken ELF modules produced by objcopy. It would be desirable to fix this in objcopy itself.

There is nothing wrong with objcopy. GRUB2 should be fixed instead.

The ELF loader of GRUB2 is IMO OK.

"objcopy -O elf32-i386 pe-file.o elf-file.o" definitly produces bad pc-relative relocation with offset 4. There are some provisions in the BFD COFF_WITH_PE code to fix the offset later in the executable. But this has no effect when converting relocatable modules.

You should be to link PECOFF .o files with ELF .o files to generate
ELF executable.

GRUB2 requires relocatable (ld -r ...) ELF modules. And ld does not support "--oformat elf32-i386" for PE input files ("ld: cannot perform PE operations on non PE output file ...")


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