Messages in this thread | | | Subject | Re: [PATCH] x86 Boot enhancements, pic 16 4/9 | From | (Eric W. Biederman) | Date | 05 Apr 2002 01:29:49 -0700 |
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Martin Mares <mj@ucw.cz> writes:
> Hello! > > > Instead removes the assumption the code is linked to run at 0. The > > binary code is already PIC, this makes the build process the same way, > > making the build requirements more flexible. > > What are the reasons to do this change? The assumption that "linked at 0" > assumptions looks pretty harmless and the "-start"'s everywhere are ugly.
Short answer the current assembly is broken.
Long answer.
Without the "-start"'s the gas generates a relocation record for every one of those instructions. The correct syntax with gas is ugly. If you can find the gas equivalent of an assume %ds ... directive I will use it.
The fact that you can't treat the generated .o as a normal object is simply a maintenance nightmare.
With this change it is possible to write a linker script that generates a bzImage. I won't do it as every other build of ld is broken with respect to interesting linker scripts. But there are still some subsets of that idea that make sense.
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