On Mon, Jan 27, 2025 at 08:53:23PM +0800, Liam Zhang wrote: > Hi, > > I'm using manjaro linux and the objcopy version is 2.43.0. > > I met a severe problem when building XV6 for x86. It produced a huge img. > Later I tracked down to the objcopy command. That's the reason. > > *objcopy -S -O binary initcode.out initcode* > > The initcode.out is 752 bytes, but the output initcode file is 134512860 > bytes, which is insane.
No, there is nothing wrong here at all. You asked for a binary output from an input file that has two wildly separated loadable segments. So you get a binary output with a lot of zeros covering the difference in addresses. objdump -hw /tmp/initcode.out /tmp/initcode.out: file format elf32-i386 Sections: Idx Name Size VMA LMA File off Algn Flags 0 .note.gnu.property 00000028 080480b4 080480b4 000000e0 2**2 CONTENTS, ALLOC, LOAD, READONLY, DATA 1 .text 0000002c 00000000 00000000 000000b4 2**2 CONTENTS, ALLOC, LOAD, CODE > This command works well for objcopy-2.34. You are mistaken. objcopy-2.34 gives the same output. > the initcode.out is attached, please verify it. > Thank you. > > Liam Zhang -- Alan Modra
