linux-kernel 2.1.130/VGER and egcs-2.92.23

linux-kernel 2.1.130/VGER and egcs-2.92.23

[teunis]

For those who don't have linux-2.1.130 source I'm not providing enough
info here to properly diagnose...  tell me what to provide as I don't have
a working @#@#$^ web browser so can't read the docs.

linux-2.1.125-130 (VGER), lotsa other details.
Cyrix 6x86-200+ (non-MMX so pentium optimizations chosen).
Older egcs works.
Newer egcs spits out:
gcc -D__KERNEL__ -I/usr/src/linux/include -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -pipe -fno-strength-reduce -m486 -malign-loops=2 -malign-jumps=2 -malign-functions=2 -DCPU=586  -c -o init/main.o init/main.c
/usr/src/linux/include/asm/string.h: In function `check_cyrix_cpu':
/usr/src/linux/include/asm/string.h:40: Invalid `asm' statement:
/usr/src/linux/include/asm/string.h:40: fixed or forbidden register 4 (si) was spilled for class SIREG.
/usr/src/linux/include/asm/string.h: In function `get_options':
/usr/src/linux/include/asm/string.h:160: Invalid `asm' statement:
/usr/src/linux/include/asm/string.h:160: fixed or forbidden register 4 (si) was spilled for class SIREG.
/usr/src/linux/include/asm/string.h: In function `name_to_kdev_t':
/usr/src/linux/include/asm/string.h:141: Invalid `asm' statement:
/usr/src/linux/include/asm/string.h:141: fixed or forbidden register 2 (cx) was spilled for class CREG.
/usr/src/linux/include/asm/string.h:141: Invalid `asm' statement:
/usr/src/linux/include/asm/string.h:141: fixed or forbidden register 2 (cx) was spilled for class CREG.
/usr/src/linux/include/asm/string.h: In function `checksetup':
/usr/src/linux/include/asm/string.h:141: Invalid `asm' statement:
/usr/src/linux/include/asm/string.h:141: fixed or forbidden register 2 (cx) was spilled for class CREG.
/usr/src/linux/include/asm/string.h:141: Invalid `asm' statement:
/usr/src/linux/include/asm/string.h:141: fixed or forbidden register 2 (cx) was spilled for class CREG.
/usr/src/linux/include/asm/string.h:141: Invalid `asm' statement:
/usr/src/linux/include/asm/string.h:141: fixed or forbidden register 2 (cx) was spilled for class CREG.
/usr/src/linux/include/asm/string.h:141: Invalid `asm' statement:
/usr/src/linux/include/asm/string.h:141: fixed or forbidden register 2 (cx) was spilled for class CREG.
/usr/src/linux/include/asm/string.h: In function `parse_options':
/usr/src/linux/include/asm/string.h:160: Invalid `asm' statement:
/usr/src/linux/include/asm/string.h:160: fixed or forbidden register 4 (si) was spilled for class SIREG.
/usr/src/linux/include/asm/string.h:119: Invalid `asm' statement:
/usr/src/linux/include/asm/string.h:119: fixed or forbidden register 4 (si) was spilled for class SIREG.
/usr/src/linux/include/asm/string.h:119: Invalid `asm' statement:
/usr/src/linux/include/asm/string.h:119: fixed or forbidden register 4 (si) was spilled for class SIREG.
/usr/src/linux/include/asm/string.h:119: Invalid `asm' statement:
/usr/src/linux/include/asm/string.h:119: fixed or forbidden register 4 (si) was spilled for class SIREG.
/usr/src/linux/include/asm/string.h:141: Invalid `asm' statement:
/usr/src/linux/include/asm/string.h:141: fixed or forbidden register 2 (cx) was spilled for class CREG.
/usr/src/linux/include/asm/string.h:160: Invalid `asm' statement:
/usr/src/linux/include/asm/string.h:160: fixed or forbidden register 4 (si) was spilled for class SIREG.
/usr/src/linux/include/asm/string.h: In function `start_kernel':
/usr/src/linux/include/asm/string.h:535: Invalid `asm' statement:
/usr/src/linux/include/asm/string.h:535: fixed or forbidden register 2 (cx) was spilled for class CREG.
make: *** [init/main.o] Error 1

Re: linux-kernel 2.1.130/VGER and egcs-2.92.23

[Matthias Urlichs]

Hi,

teunis:
> Newer egcs spits out:
> gcc -D__KERNEL__ -I/usr/src/linux/include -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -pipe -fno-strength-reduce -m486 -malign-loops=2 -malign-jumps=2 -malign-functions=2 -DCPU=586  -c -o init/main.o init/main.c
> /usr/src/linux/include/asm/string.h: In function `check_cyrix_cpu':
> /usr/src/linux/include/asm/string.h:40: Invalid `asm' statement:
> /usr/src/linux/include/asm/string.h:40: fixed or forbidden register 4 (si) was spilled for class SIREG.

The code looks like this:

extern inline char * strcpy(char * dest,const char *src)
{
__asm__ __volatile__(
    "cld\n"
    "1:\tlodsb\n\t"
    "stosb\n\t"
    "testb %%al,%%al\n\t"
    "jne 1b"
    : /* no output */
    :"S" (src),"D" (dest):"si","di","ax","memory");
return dest;
}

-- 
Matthias Urlichs  |  noris network GmbH   |   smurf@noris.de  |  ICQ: 20193661

Re: linux-kernel 2.1.130/VGER and egcs-2.92.23

[Alexandre Oliva]

On Dec  9, 1998, teunis <teunis@computersupportcentre.com> wrote:

> /usr/src/linux/include/asm/string.h:40: Invalid `asm' statement:

Doesn't it say it all?  You should probably read the following FAQs
unless you've read them already:

http://egcs.cygnus.com/faq.html#linuxkernel
http://egcs.cygnus.com/faq.html#asmclobber

-- 
Alexandre Oliva  http://www.dcc.unicamp.br/~oliva  aoliva@{acm.org}
oliva@{dcc.unicamp.br,gnu.org,egcs.cygnus.com,samba.org}
Universidade Estadual de Campinas, SP, Brasil