Date: Fri, 20 Oct 1995 01:03:39 +0100 From: peter@citylink.dinoex.sub.org (Peter Much) To: freebsd-hackers@freebsd.org Subject: modf.S (in libc.a): stack access fault Message-ID: <199510200003.BAA14324@citylink.dinoex.sub.org>
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The funktion modf() (in libc.a, from lib/libc/i386/gen/modf.S) seems to
dismangle the program stack. This is the reason why ingres cannot handle
float values with FreeBSD (and other OS's - i reported that here, somewhen
about May). If linked with lib/msun/src/s_modf.c instead, it does work.
A friend of mine had already reported this bug to Borland/Heimsoeth years
ago - so it was obviously not the latest version of the Borland compiler
library that made it into FreeBSD.:-((
To reproduce the error, try the following code:
----------------------------------------------------------------------
#include <stdio.h>
main()
{
double arg = 0.0, fj;
int i;
char *p, buf[21];
p = buf;
for(i=0; i < 20; i++) {
arg *= 10;
(void)modf(arg, &fj);
arg -= fj;
*p++ = (int)fj + '0';
}
*p = '\0';
printf("%s\n", buf);
}
----------------------------------------------------------------------
It crashes with i=7. I don't know math-copro-assembler, so i cannot
debug this.
Peter
P.S: Anybody wanting the ingres patches to build a port?
--
Write to: Peter Much * Koelnische Str. 22 * D-34117 Kassel * +49-561-774961
peter@citylink.dinoex.sub.org * much@hrz.uni-kassel.de
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