On 15-Nov-01 Maxim Sobolev wrote: > That explains... After a quick glance at png code I found that > the only place where EFLAGS is altered is CPUID code, where > the library flips bit 21 of EFLAGS in order to ensure that the > CPUID instruction is supported (otherwise it will get SIGILL > on older processors). Unfortunately, for some reason FreeBSB > kernel considers bit 21 of EFLAGS as one that should not be > altered in the user mode, thus making it illegal to use standard > user-mode processor-detection routines based around that bit. > AFAIK, it is a bug in FreeBSD, because there is actually nothing > wrong with altering bit 21 in the user mode - it doesn't have > any side effects and pretty much any of the currently available > on the i386 OSes allows it.
Agreed, patch looks good to me. -- John Baldwin <[EMAIL PROTECTED]> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-hackers" in the body of the message
