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Date: Mon, 2 Sep 2002 04:01:45 -0400
From: Jake Burkholder <jake@locore.ca>
To: Bruce Evans <bde@zeta.org.au>
Cc: current@FreeBSD.ORG
Subject: Re: aout support broken in gcc3
Message-ID: <20020902040144.H67527@locore.ca>
References: <20020902141223.Y2138-100000@gamplex.bde.org>
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In-Reply-To: <20020902141223.Y2138-100000@gamplex.bde.org>; from bde@zeta.org.au on Mon, Sep 02, 2002 at 02:24:08PM +1000
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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?

> assignments to long longs and shifts of long longs by a non-constant
> amount:
> 
> %%%
> $ cat z.c
> long long x = 0;
> int y;
> 
> foo()
> {
> 	x = x << y;
> }
> $ cc -O -S -aout z.c
> $ cat z.s
> 	.file	"z.c"
> .globl _x
> 	.data
> 	.p2align 3
> 	.type	_x,@object
> 	.size	_x,8
> _x:
> 	.quad	0
> 	.text
> 	.p2align 2,0x90
> .globl _foo
> 	.type	_foo,@function
> _foo:
> 	pushl	%ebp
> 	movl	%esp, %ebp
> 	movb	_y, %cl
> 	movl	_x, %eax
> 	movl	_x+4, %edx
> 	shldl	%eax, %edx
> 	sall	%cl, %eax
> 	testl	$32, %ecx
> 	je	L2
> 	movl	%eax, %edx
> 	movl	$0, %eax
> L2:
> 	movl	%eax, _x
> 	movl	%edx, _x+4
> 	leave
> 	ret
> Lfe1:
> 	.size	_foo,Lfe1-_foo
> 	.comm	 _y,4
> 	.ident	"GCC: (GNU) 3.1 [FreeBSD] 20020509 (prerelease)"
> %%%
> 
> 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.
> 
> Bruce
> 
> 
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