On Fri, 2 Jul 2004 11:44:25 +0200, Borislav Petkov <borislav.petkov@t-online.de> wrote: > > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Hi there guys, > a new day - a new question :)) > > I've been trying to figure out today how BUG() works, it is inline assembly, > again: > > <from include/asm-i386/bug.h:12> > 12 #if 1 /* Set to zero for a slightly smaller kernel */ > 13 #define BUG() \ > 14 __asm__ __volatile__( "ud2\n" \ > 15 "\t.word %c0\n" \ > 16 "\t.long %c1\n" \ > 17 : : "i" (__LINE__), "i" (__FILE__)) > > I know that ud2 means undefined and generates invalid opcode exception, .word > and .long are as directives, "i" as an input operand constraint is an > immediate integer operand with constant value, but what I can't understand > after looking into the as and gcc manuals is: > > 1. what does the c mean in the constraint %c0, %c1 resp.? i don't know. i will see if i can find something... > 2. Where does the compiler get those __LINE__ and __FILE__ from? they are gcc specific. i know of __FUNCTION__ which provides the function name. i am sure there are others too... kind regards anupam > > Thanks in advance for your patience, > Boris. > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.2.4 (GNU/Linux) > > iD4DBQFA5S59iBySr3Fn37QRAkGEAJsHBryqVQ+0JMOss3VbwHCQ6XIIwQCY0w1J > 1WsQ29Rtna0rQ7OQyb3AnA== > =vvr7 > -----END PGP SIGNATURE----- > > -- > Kernelnewbies: Help each other learn about the Linux kernel. > Archive: http://mail.nl.linux.org/kernelnewbies/ > FAQ: http://kernelnewbies.org/faq/ > > -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
