[src/trunk]: src/lib/libc/arch/sh3/sys Use macros from <machine/asm.h>. Add ...

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

details:   https://anonhg.NetBSD.org/src/rev/9890d083add8
branches:  trunk
changeset: 586942:9890d083add8
user:      uwe <uwe%NetBSD.org@localhost>
date:      Thu Jan 05 18:20:29 2006 +0000

description:
Use macros from <machine/asm.h>.  Add some comments.
Same PIC object code.  Almost the same non-PIC object code (b/c of
s/jsr/jmp/ to _exit).

diffstat:

 lib/libc/arch/sh3/sys/__clone.S |  62 ++++++++++++++++------------------------
 1 files changed, 25 insertions(+), 37 deletions(-)

diffs (85 lines):

diff -r 4dbc357e757b -r 9890d083add8 lib/libc/arch/sh3/sys/__clone.S
--- a/lib/libc/arch/sh3/sys/__clone.S   Thu Jan 05 17:13:20 2006 +0000
+++ b/lib/libc/arch/sh3/sys/__clone.S   Thu Jan 05 18:20:29 2006 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: __clone.S,v 1.3 2003/10/24 04:41:28 uwe Exp $  */
+/*     $NetBSD: __clone.S,v 1.4 2006/01/05 18:20:29 uwe Exp $  */
 
 /*-
  * Copyright (c) 2001 Tsubai Masanari.  All rights reserved.
@@ -45,51 +45,39 @@
        tst     r5, r5
        bt      inval
 
-       mov     r4, r2
-       mov     r6, r4
-       mov.l   LSYS___clone, r0
+       mov     r4, r2          /* save entry point for later */
+
+       mov     r6, r4          /* r4 = flags, r5 = stack (already) */
+       mov.l   .L_SYS___clone, r0
        trapa   #0x80
        bf      err
 
        tst     r0, r0
-       bf      1f              /* We're the parent, just return. */
+       bf      3f              /* we're the parent, just return */
 
-       jsr     @r2             /* Call the clone's entry point. */
-       mov     r7, r4          /* arg */
+       jsr     @r2             /* clone does _exit((*fn)(arg)); */
+        mov    r7, r4
 
-       mov.l   L__exit, r1
-#ifdef PIC
-       braf    r1
-#else
-       jsr     @r1
-#endif
-       mov     r0, r4
-2:
+       mov.l   .L__exit, r1
+1:     JUMP    r1
+        mov    r0, r4
+       /* NOTREACHED */
+
 inval:
        mov     #EINVAL, r0
 err:
-       mov.l   Lcerror, r1
-#ifdef PIC
-       braf    r1
-#else
-       jmp     @r1
-#endif
-       nop
-1:
-       rts
-       nop
+       mov.l   .L_cerror, r1
+2:     JUMP    r1
+        nop
+       /* NOTREACHED */
+
+3:     rts
+        nop
 
        .align  2
-LSYS___clone:
+.L_SYS___clone:
        .long   SYS___clone
-#ifdef PIC
-L__exit:
-       .long   _C_LABEL(_exit)-2b
-Lcerror:
-       .long   cerror-1b
-#else
-L__exit:
-       .long   _C_LABEL(_exit)
-Lcerror:
-       .long   cerror
-#endif
+.L__exit:
+       CALL_DATUM_LOCAL(_C_LABEL(_exit), 1b)
+.L_cerror:
+       CALL_DATUM_LOCAL(cerror, 2b)