Date: Wed, 30 Apr 2003 11:06:14 -0700 (PDT) From: Peter Wemm <peter@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/lib/libc/amd64 SYS.h Message-ID: <200304301806.h3UI6E50015775@repoman.freebsd.org>
next in thread | raw e-mail | index | archive | help
peter 2003/04/30 11:06:14 PDT
FreeBSD src repository
Modified files:
lib/libc/amd64 SYS.h
Log:
Update for AMD64-style syscalls. Repocopied from i386/SYS.h.
Note that the syscall instruction clobbers %rcx, which is inconvenient
because it is the fourth syscall argument, so we use %r10 (another scratch
register) for the 4th syscall arg instead (I picked %r10 to be the same as
NetBSD). int 0x80 is still possible though, and it uses %rcx as usual.
Note that the syscall style syscall does *NOT* preserve all the registers,
unlike int 0x80. We do not preserve the scratch registers except for
%rdi and %rsi. int 0x80 does preserve everything but the return values.
Revision Changes Path
1.25 +4 -7 src/lib/libc/amd64/SYS.h
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200304301806.h3UI6E50015775>