Date: Mon, 7 Apr 2008 02:37:11 -0700 (PDT) From: Unga <unga888@yahoo.com> To: freebsd-questions@freebsd.org Subject: Inline assembly under FreeBSD Message-ID: <687872.53069.qm@web57011.mail.re3.yahoo.com>
next in thread | raw e-mail | index | archive | help
Hi all
I'm trying to execute following inline assembly code
in a C function under FreeBSD 7.0:
typedef unsigned char u8;
typedef unsigned short u16;
u8 devno= 0x80;
static int check_extensions(u8 devno)
{
u16 ax, bx, cx, dx, di;
ax = 0x4100;
bx = 0x55AA;
dx = devno;
asm("pushfl; stc; int $0x13; setc %%al; popfl"
: "+a" (ax), "+b" (bx), "=c" (cx), "+d" (dx)
: : "esi", "edi");
if ((u8)ax)
return -1; /* No extended information */
else
return 1; /* Extended information available */
}
When it is executing the int $0x13, it crashes with
"Program received signal SIGBUS, Bus error."
Could you guys give me a helping hand to identify
what's the problem?
Input and return values are at:
http://en.wikipedia.org/wiki/INT_13
Thanks in advance.
Kind regards
Unga
____________________________________________________________________________________
You rock. That's why Blockbuster's offering you one month of Blockbuster Total Access, No Cost.
http://tc.deals.yahoo.com/tc/blockbuster/text5.com
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?687872.53069.qm>