From: Kenji Okamoto <okamoto@granite.cias.osakafu-u.ac.jp>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] fp: stack underflow error
Date: Thu, 1 Jul 2004 17:55:37 +0900 [thread overview]
Message-ID: <7549f198696335dda5fba154f63068af@granite.cias.osakafu-u.ac.jp> (raw)
In-Reply-To: <b974470c3e357a7efd16b8345fb68e94@orthanc.cc.titech.ac.jp>
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Probably, you see some comment in a ghostscript program
gshtscr.c by Russ (ssearch RSC string). Because now Russ is out.
Kenji
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From: YAMANASHI Takeshi <uncover@beat.cc.titech.ac.jp>
To: 9fans@cse.psu.edu
Subject: [9fans] fp: stack underflow error
Date: Thu, 1 Jul 2004 13:50:35 +0900
Message-ID: <b974470c3e357a7efd16b8345fb68e94@orthanc.cc.titech.ac.jp>
I encountered a "sys: fp: stack underflow" error in my program.
When I change the uint arguments of a2b() to int, the modified program
ran successfully. What's wrong with my program?
Thanks in advance.
++ program and acid stack trace are attached below ++
% nashi@valinore cat suflow.c
#include <u.h>
#include <libc.h>
/*{
8c suflow.c; 8l suflow.8; ./8.out
}*/
ulong
a2b(uint fr, uint fg, uint fb, uint tr, uint tg, uint tb, double dis)
{
uchar r, g, b;
r = fr + (tr - fr)*dis;
g = fg + (tg - fg)*dis;
b = fb + (tb - fb)*dis;
return (r<<24)+(g<<16)+(b<<8)+0xFF;
}
void
main()
{
int i;
ulong p;
for(i=0; i<256; i++)
p=a2b(0, 0, 0xFF, 00, 0xFF, 00, 2.0*i/256.0);
exits(nil);
}
% nashi@valinore ./8.out
8.out 1167: suicide: sys: fp: stack underflow fppc=0x1118 status=0x80a1 pc=0x0000118f
% nashi@valinore acid 1167
/proc/1167/text:386 plan 9 executable
/sys/lib/acid/port
/sys/lib/acid/386
acid: stk()
At pc:0x0000118f:main+0x46 /usr/nashi/src/test/suflow.c:27
main() /usr/nashi/src/test/suflow.c:21
called from _main+0x31 /sys/src/libc/386/main9.s:16
--
next prev parent reply other threads:[~2004-07-01 8:55 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-07-01 4:50 YAMANASHI Takeshi
2004-07-01 8:55 ` Kenji Okamoto [this message]
2004-07-01 19:24 ` rog
2004-07-01 20:32 ` Charles Forsyth
2004-07-01 20:38 ` boyd, rounin
2004-07-02 9:34 ` Charles Forsyth
2004-07-02 10:25 ` Geoff Collyer
2004-07-02 10:53 ` Charles Forsyth
2004-07-02 0:35 YAMANASHI Takeshi
2004-07-02 1:02 ` Kenji Okamoto
2004-07-02 1:04 ` Kenji Okamoto
2004-07-02 1:05 ` Kenji Okamoto
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