PERFORCE change 29752 for review

[Peter Wemm]

http://perforce.freebsd.org/chv.cgi?CH=29752

Change 29752 by peter at peter_daintree on 2003/04/25 17:52:59

	Use the 'syscall' instruction for syscalls.  Unfortunately,
	syscall clobbers %rcx, which is one of the syscall arguments
	according to the ABI.  I had a look to see what NetBSD did and
	they use %r10 instead.  Do the same here.

Affected files ...

.. //depot/projects/hammer/lib/libc/x86_64/SYS.h#4 edit

Differences ...

==== //depot/projects/hammer/lib/libc/x86_64/SYS.h#4 (text+ko) ====

@@ -55,4 +55,4 @@
 			.set CNAME(__CONCAT(_,x)),CNAME(__CONCAT(__sys_,x)); \
 			mov __CONCAT($SYS_,x),%rax; KERNCALL; ret
 
-#define KERNCALL	int $0x80
+#define KERNCALL	movq %rcx, %r10; syscall