MIPS SF toolchain

Matej Kupljen matej.kupljen@ultra.si
Thu Sep 8 08:41:00 GMT 2005


> On gcc 3.3.x --with-float=soft does nothing.  If you are using a MIPS32 
> ISA processor you can configure it with --target=mipsisa32[el]-linux to 
> get soft float and MIPS32 ISA by default.

Thank you for the explanation.

> But even better would be to use gcc 3.4.x or 4.0.x where 
> --with-float=soft works.  I would also recommend binutils 2.16.1 or 
> above as there are some severe bugs in the mips linker in earlier versions.

Yesterday I tried with the gcc 3.4.3, glibc 2.3.5 and binutils 2.16.1.
libgcc.a looks O.K, because I did not find any FP instruction, however
if I do objdump on libc.so.6, I get:

0002ff70 <__sigsetjmp_aux>:
   2ff70:       3c1c0017        lui     gp,0x17
   2ff74:       279cce30        addiu   gp,gp,-12752
   2ff78:       0399e021        addu    gp,gp,t9
   2ff7c:       00801021        move    v0,a0
   2ff80:       e4940038        swc1    $f20,56(a0)
   2ff84:       e495003c        swc1    $f21,60(a0)
   2ff88:       e4960040        swc1    $f22,64(a0)
   2ff8c:       e4970044        swc1    $f23,68(a0)
   2ff90:       e4980048        swc1    $f24,72(a0)
   2ff94:       e499004c        swc1    $f25,76(a0)
   2ff98:       e49a0050        swc1    $f26,80(a0)
   2ff9c:       e49b0054        swc1    $f27,84(a0)
   2ffa0:       e49c0058        swc1    $f28,88(a0)
   2ffa4:       e49d005c        swc1    $f29,92(a0)
   2ffa8:       e49e0060        swc1    $f30,96(a0)
   2ffac:       e49f0064        swc1    $f31,100(a0)
   2ffb0:       ac9f0000        sw      ra,0(a0)
   2ffb4:       ac860004        sw      a2,4(a0)
   2ffb8:       ac870028        sw      a3,40(a0)

Again, FP instructions! I don't know what is wrong :-(

Now I am trying with the:
GCC: 4.1.0
GLIBC: 2.3.5
BINUTILS: 2.16.1
Linux Headers: 2.6.11

Will let you know, when the toolchain is built.


P.S.: I am cc-ing crosstool mailing list too.

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