Re: ISDN 2.2.11 isdn_audio.c compile problem with gcc-2.95

Paul Slootman (paul@wau.mis.ah.nl)
Thu, 12 Aug 1999 11:10:47 +0200

To: linux@billabong.demon.co.uk
Subject: Re: ISDN 2.2.11 isdn_audio.c compile problem with gcc-2.95
X-Newsgroups: ahwau.linux-kernel
In-Reply-To: <37B049F7.64CF9D9D@billabong.demon.co.uk>
Organization: Albert Heijn Winkelautomatisering
Cc:
Bcc:

>Kernel 2.2.11, isdn_audio.c bombs out during compile with gcc-2.95
>in this way:
>
>gcc -D__KERNEL__ -I/usr/src/linux/include -Wall -Wstrict-prototypes
>-O2 -fomit-frame-pointer -fno-strict-aliasing -pipe
>-fno-strength-reduce -mpentium -malign-loops=2 -malign-jumps=2
>-malign-functions=2 -DCPU=586 -DMODULE -c -o isdn_audio.o
>isdn_audio.c
>isdn_audio.c: In function `isdn_audio_ulaw2alaw':
>isdn_audio.c:292: Invalid `asm' statement:
>isdn_audio.c:292: fixed or forbidden register 2 (cx) was spilled for
>class CREG.

This was posted on the isdn4linux mailing list:

From: linux@locutus.mandrakesoft.de

diff -urN linux.old/drivers/isdn/isdn_audio.c linux/drivers/isdn/isdn_audio.c
--- linux.old/drivers/isdn/isdn_audio.c Sun May 23 20:03:42 1999
+++ linux/drivers/isdn/isdn_audio.c Wed Aug 4 20:58:34 1999
@@ -269,16 +269,21 @@
};

#if ((CPU == 386) || (CPU == 486) || (CPU == 586))
+
static inline void
isdn_audio_tlookup(const void *table, void *buff, unsigned long n)
{
+/* Dummy variables for the gcc-2.95 compatibility */
+int __dummy_1,__dummy_2,__dummy_3,__dummy_4;
+
__asm__("cld\n"
"1:\tlodsb\n\t"
"xlatb\n\t"
"stosb\n\t"
"loop 1b\n\t"
- : : "b"((long) table), "c"(n), "D"((long) buff), "S"((long) buff)
- : "bx", "cx", "di", "si", "ax");
+ : "=b" (__dummy_1), "=c" (__dummy_2), "=D" (__dummy_3), "=S" (__dummy_4)+ : "b"((long) table), "c"(n), "D"((long) buff), "S"((long) buff)
+ : "ax");
}

#else

Paul Slootman

-- 
home:   paul@wurtel.demon.nl    http://www.wurtel.demon.nl/
debian: paul@debian.org      isdn4linux: paul@isdn4linux.de
work:   paul@murphy.nl       Murphy Software, Enschede,  NL


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