diff options
| author |   mickey <mickey@openbsd.org> | 2004-01-28 01:39:38 +0000 |
|---|---|---|
| committer | mickey <mickey@openbsd.org> | 2004-01-28 01:39:38 +0000 |
| commit | f5df1827e930693b77256fbf32ab5050c01d960c (patch) | |
| tree | 864af18bc7e8bce47743bc121c791bd7c200c097 /sys/lib/libkern/arch/amd64/bcmp.S | |
| parent | remove unused variable. ok millert@ (diff) | |
| download | wireguard-openbsd-f5df1827e930693b77256fbf32ab5050c01d960c.tar.xz wireguard-openbsd-f5df1827e930693b77256fbf32ab5050c01d960c.zip | |
an amd64 arch support.
hacked by art@ from netbsd sources and then later debugged
by me into the shape where it can host itself.
no bootloader yet as needs redoing from the
recent advanced i386 sources (anyone? ;)
Diffstat (limited to 'sys/lib/libkern/arch/amd64/bcmp.S')
| -rw-r--r-- | sys/lib/libkern/arch/amd64/bcmp.S | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/sys/lib/libkern/arch/amd64/bcmp.S b/sys/lib/libkern/arch/amd64/bcmp.S new file mode 100644 index 00000000000..5cee3afe74b --- /dev/null +++ b/sys/lib/libkern/arch/amd64/bcmp.S @@ -0,0 +1,24 @@ +#include <machine/asm.h> + +#if defined(LIBC_SCCS) + RCSID("$NetBSD: bcmp.S,v 1.1 2001/06/19 00:22:45 fvdl Exp $") +#endif + +ENTRY(bcmp) + xorl %eax,%eax /* clear return value */ + cld /* set compare direction forward */ + + movq %rdx,%rcx /* compare by words */ + shrq $3,%rcx + repe + cmpsq + jne L1 + + movq %rdx,%rcx /* compare remainder by bytes */ + andq $7,%rcx + repe + cmpsb + je L2 + +L1: incl %eax +L2: ret |