60 lines
1.9 KiB
Plaintext
60 lines
1.9 KiB
Plaintext
$NetBSD: README,v 1.6 1999/08/20 21:12:47 christos Exp $
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BUGS/PROBLEMS:
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* rtld.c around line 184:
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#iffdef __alpha__
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/* XXX XXX XXX */
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_rtld_objself.pltgot = NULL;
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#endif
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It's a workaround for a linker bug, and will go away when the linker is
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fixed.
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* Formerly, _DYNAMIC was _GLOBAL_OFFSET_TABLE_[0], but that isn't true with
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newer snapshots of gas/binutils (at least on the Alpha), which support
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multiple GOTs. That's what the OLD_GOT #ifdefs are about.
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* The method used to relocate ld.so is shoddy and fragile. Currently it's
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something like:
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alpha, powerpc:
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(1) assembly code relocates RELATIVE relocations in the GOT
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(on some ports, all relative relocations; this will probably
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have to be #ifdef'd in reloc.c), assuming that everything
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in the GOT is a RELATIVE relocation.
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(2) C code relocates the rest of the loader, excluding those
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RELATIVE relocations already done (via an ... iffy heuristic).
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i386, m68k, sparc:
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(1) C code relocates RELATIVE relocations in _rtld_init() carefully
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so that it does not touch any globals.
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(2) C code relocates the rest of the loader, excluding those
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RELATIVE relocations already done (via an ... iffy heuristic).
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mips:
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(1) loads ld.elf_so at 0, so no relocating is necessary.
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Something better (like that the glibc ELF ld.so does) should be done
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eventually, where a single set of C code is compiled twice, once for
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normal use, and once to be used to relocate the shared linker. No
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relocations should be processed in assembly language.
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* On the Alpha, this code Really needs to be checked to be sure that
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it doesn't make calls that could use FP, while doing lazy binding.
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TO DO:
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* Support for other platforms
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* Support for coexistance of 32-bit and 64-bit ELF on platforms that can
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do that.
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* Possible support for ldd (standalone operation) and program loading
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a la the glibc shared loader.
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* Support for relocating ld.elf_so on mips
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