[src/trunk]: src/lib/libc/arch/powerpc/sys Since powerpc passes 8 arguments i...

[matt <matt%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/07b0f57b8af8
branches:  trunk
changeset: 326537:07b0f57b8af8
user:      matt <matt%NetBSD.org@localhost>
date:      Sat Feb 01 20:26:21 2014 +0000

description:
Since powerpc passes 8 arguments in registers and the syscall number in r0,
shuffle register argument so the kernel won't need to access the stack to
retrieve that last argument.

diffstat:

 lib/libc/arch/powerpc/sys/__syscall.S |  23 ++++++++++++++++++++---
 lib/libc/arch/powerpc/sys/syscall.S   |   6 ++----
 2 files changed, 22 insertions(+), 7 deletions(-)

diffs (40 lines):

diff -r 388b9b6734e2 -r 07b0f57b8af8 lib/libc/arch/powerpc/sys/__syscall.S
--- a/lib/libc/arch/powerpc/sys/__syscall.S     Sat Feb 01 20:07:07 2014 +0000
+++ b/lib/libc/arch/powerpc/sys/__syscall.S     Sat Feb 01 20:26:21 2014 +0000
@@ -1,5 +1,22 @@
-/*     $NetBSD: __syscall.S,v 1.1 2000/12/13 07:50:48 matt Exp $       */
+/*     $NetBSD: __syscall.S,v 1.2 2014/02/01 20:26:21 matt Exp $       */
+
+#include <powerpc/asm.h>
 
-#include "SYS.h"
+       .text
+       .align  2
+ENTRY(__syscall)
+       mr      %r0,%r3         /* syscall number */
+       mr      %r3,%r4
+       mr      %r4,%r5
+       mr      %r5,%r6
+       mr      %r6,%r7
+       mr      %r7,%r8
+       mr      %r8,%r9
+       mr      %r9,%r10
+       lwz     %r10,8(%r1)     /* final argument is on the stack */
+       sc
+       bnslr
+       b       _C_LABEL(__cerror)
+END(__syscall)
 
-RSYSCALL(__syscall)
+STRONG_ALIAS(syscall, __syscall)
diff -r 388b9b6734e2 -r 07b0f57b8af8 lib/libc/arch/powerpc/sys/syscall.S
--- a/lib/libc/arch/powerpc/sys/syscall.S       Sat Feb 01 20:07:07 2014 +0000
+++ b/lib/libc/arch/powerpc/sys/syscall.S       Sat Feb 01 20:26:21 2014 +0000
@@ -1,5 +1,3 @@
-/*     $NetBSD: syscall.S,v 1.2 1998/05/25 15:28:04 ws Exp $   */
+/*     $NetBSD: syscall.S,v 1.3 2014/02/01 20:26:21 matt Exp $ */
 
-#include "SYS.h"
-
-RSYSCALL(syscall)
+/* aliased to __syscall */