On Mon, Aug 03, 2009 at 10:20:30AM +0100, Ralf Baechle wrote: > On Thu, Jul 30, 2009 at 11:49:23AM -0700, David VomLehn wrote: > > > To: GCC Help Mailing List <gcc-help@xxxxxxxxxxx>, > > Linux MIPS Mailing List <linux-mips@xxxxxxxxxxxxxx> > > Subject: Relocation problem with MIPS kernel modules > > Content-Type: text/plain; charset=us-ascii > > > > I have a MIPS loadable kernel module that, when I try to insmod it, causes the > > kernel to emit the message: > > > > module xyz: dangerous relocation ... > > According to the MIPS ABI, for what it's worth, "Each relocation type of > > R_MIPS_HI16 must have an associated R_MIPS_LO16 entry immediately following > > it in the list of relocations." So, what's actually getting generated by > > gcc and linker differs from the closest thing we have to an ABI of record for > > MIPS processors. > > The GNU tools as an extension over the MIPS ABI allows an arbitrary number of > R_MIPS_HI16 relocations to be followed by a R_MIPS_LO16 symbol. All > relocations of this sequence must use the same symbol, of course. This is > a very old extension; I think it predates the Linux/MIPS port. Perhaps a foolish question, but is this documented anywhere? I know there is a a document over at http://gcc.gnu.org/gcc-3.4/mips-abi.html addressing some other MIPS ABI changes, but I didn't see this one. Obviously, we could put documentation on the linux-mips Wiki, with pointers to other documents, but I'm not sure this is the right place. I'm also concerned there could be other ABI changes/extensions that need to be included. > Ralf David
