Jens Rehsack wrote:
> Hi,
>
> I tried to update a machine which will become a webserver in
> near future. I received following error in buildkernel:
>
> [...]
>
> cc -c -O -pipe -march=pentium4 -Wall \
> -Wredundant-decls -Wnested-externs -Wstrict-prototypes \
> -Wmissing-prototypes -Wpointer-arith -Winline \
> -Wcast-qual-fformat-extensions -std=c99 -nostdinc \
> -I- -I. -I/usr/src/sys -I/usr/src/sys/dev \
> -I/usr/src/sys/contrib/dev/acpica \
> -I/usr/src/sys/contrib/ipfilter \
> -I/usr/src/sys/contrib/dev/ath \
> -I/usr/src/sys/contrib/dev/ath/freebsd -D_KERNEL \
> -include opt_global.h -fno-common \
> -mno-align-long-strings \
> -mpreferred-stack-boundary=2 -ffreestanding \
> /usr/src/sys/dev/ata/ata-all.c
> {standard input}: Assembler messages:
> {standard input}:7652: Error: invalid character '_' in mnemonic
> *** Error code 1
>
> Stop in /usr/obj/usr/src/sys/MOBY.
> *** Error code 1
>
> Stop in /usr/src.
> *** Error code 1
>
I made some research (as good as I could) and found out/assumed sth.:
1) #APP and #NO_APP will be placed by cc around inline assembly
and forces the assembler to reformat spaces as required to parse
code well.
2) in /usr/obj/usr/src/sys/MOBY/ata-all.s (generated by cc -S)
are 209 #APP/#NO_APP pairs are used, but only above described
one fails.
3) in theory, the error described by me couldn't happen
4) the asm instruction lock ; x ; causes the processor to lock the
execution of instruction x.
b) lock ; x ; y ; cause the processor to lock x and executes y normal
c) "lock ; x ; y ;" could be written as "lock\n\tx\n\t\y\n\t" with
same generated binary code
5) if in /usr/src/sys/i386/include/atomic.h the line
" movzbl %%al,%0 ; "
is changed into
" movzbl %%al,%0\n\t" ,
the ata-all.c is compiled without any warning.
Regards,
Jens
--
L i W W W i Jens Rehsack
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