Strange assembler warning

[Bernd Walter]

On Mon, Jan 08, 2007 at 12:37:04AM +0100, Olivier Houchard wrote:
> On Sun, Jan 07, 2007 at 10:02:13PM +0100, Bernd Walter wrote:
> > I was trying to build Hans Petter's USB stack:
> > cc -c -O2 -pipe -fno-strict-aliasing -mcpu=arm9 -std=c99  -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes  -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual  -Wundef -fformat-extensions -nostdinc -I-  -I. -I../../.. -I../../../contrib/altq -D_KERNEL -DHAVE_KERNEL_OPTION_HEADERS -include opt_global.h -fno-common -finline-limit=8000 --param inline-unit-growth=100 --param large-function-growth=1000 -mcpu=arm9 -ffreestanding -Werror  ../../../dev/usb/ohci.c
> > ../../../dev/usb/ohci.c:120:1: "PHYSADDR" redefined
> > In file included from <command line>:5:
> > ./opt_global.h:3:1: this is the location of the previous definition
> > {standard input}: Assembler messages:
> > {standard input}:6052: Warning: source register same as write-back base
> > *** Error code 1
> > 
> > Stop in /usr/src/sys/arm/compile/FBOX.
> > 98.000u 3.000s 2:01.33 83.8%    37057+84655k 1+12io 2pf+0w
> > Exit 1
> > [86]arm9# 
> > 
> > Ok - the PHYADDR is a name collision with the kernel load address.
> > After removing the clash it compiles.
> > But the assembler warning remains.
> > 
> 
> Hi Bernd,
> 
> Could you put the assembler file, as provided my cc -S, and ohci.c somewhere
> online ? This typically happens with gcc allocating the wrong registers with
> inline asm, so we need to figure out which code is at fault, and try to fix it
> or work around the problem.

I redid the file with -g.
To get the new line numer in the assembly:
[121]arm9# cc -c -g -O2 -pipe -fno-strict-aliasing -mcpu=arm9 -std=c99 -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual -Wundef -fformat-extensions -nostdinc -I- -I. -I../../.. -I../../../contrib/altq -D_KERNEL -DHAVE_KERNEL_OPTION_HEADERS -include opt_global.h -fno-common -finline-limit=8000 --param inline-unit-growth=100 --param large-function-growth=1000 -mcpu=arm9 -ffreestanding -Werror ../../../dev/usb/ohci.c
{standard input}: Assembler messages:
{standard input}:7356: Warning: source register same as write-back base

http://www.bwct.de/~ticso/ohci.c
http://www.bwct.de/~ticso/ohci.s

-- 
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