Date: Mon, 2 Sep 2002 21:13:32 +1000 (EST) From: Bruce Evans <bde@zeta.org.au> To: Jake Burkholder <jake@locore.ca> Cc: current@FreeBSD.ORG Subject: Re: aout support broken in gcc3 Message-ID: <20020902205828.I3195-100000@gamplex.bde.org> In-Reply-To: <20020902040144.H67527@locore.ca>
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On Mon, 2 Sep 2002, Jake Burkholder wrote:
> Apparently, On Mon, Sep 02, 2002 at 02:24:08PM +1000,
> Bruce Evans said words to the effect of;
>
> > aout support is still required for a few things (mainly for compiling
> > some boot blocks), but is broken in gcc3 for at least compile-time
>
> Which boot blocks?
Oops, perhaps only mine. (I use my version of biosboot which is like
pc98/boot2 except it supports loading elf kernels and some local things,
and it hasn't been converted to elf at the source level.) When I wrote
the above I thought that several standard boot blocks used OBJFORMAT=-aout.
They actually just have a lot of ${OBJFORMAT} == aout ifdefs and
elf2aout conversions. Most of aout support at the source level seems to
have been broken some time ago by using new gas features in assembler
code.
> > The above assembler output has two syntax errors:
> > - ".quad 0". .quad is not supported by the old aout assembler.
> > - "shldl %eax, %edx". The old aout assembler only accepts the correct
> > syntax of "shldl %cl,%eax,%edx". Note that gcc doesn't elide the
> > similarly implicit %cl register for the sall instruction.
Wrong fixes for .quad are easy and are already done for some systems
(e.g., OpenBSD) by #undefing ASM_QUAD.
The following hack seems to fix shld (the breakage seems to be
intentional):
%%%
Index: i386.md
===================================================================
RCS file: /home/ncvs/src/contrib/gcc/config/i386/i386.md,v
retrieving revision 1.12
diff -u -2 -r1.12 i386.md
--- i386.md 1 Sep 2002 21:13:32 -0000 1.12
+++ i386.md 2 Sep 2002 05:51:30 -0000
@@ -10768,5 +10768,5 @@
"@
shld{l}\t{%2, %1, %0|%0, %1, %2}
- shld{l}\t{%s2%1, %0|%0, %1, %2}"
+ shld{l}\t{%2, %1, %0|%0, %1, %2}"
[(set_attr "type" "ishift")
(set_attr "prefix_0f" "1")
%%%
I forgot to make the corresponding change for shrd.
Bruce
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