[src/trunk]: src/lib/libc/arch/sparc64/gen Save/restore some global registers...

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

details:   https://anonhg.NetBSD.org/src/rev/fb5deb919c60
branches:  trunk
changeset: 764681:fb5deb919c60
user:      martin <martin%NetBSD.org@localhost>
date:      Sat Apr 30 19:43:17 2011 +0000

description:
Save/restore some global registers (sigsetjmp compatible). Does not realy
make a difference currently, but is a hard to spot blackhole if something
ever starts using the application registers.

diffstat:

 lib/libc/arch/sparc64/gen/_setjmp.S |  21 +++++++++++++++++++--
 1 files changed, 19 insertions(+), 2 deletions(-)

diffs (52 lines):

diff -r 42c733d49cdd -r fb5deb919c60 lib/libc/arch/sparc64/gen/_setjmp.S
--- a/lib/libc/arch/sparc64/gen/_setjmp.S       Sat Apr 30 19:39:38 2011 +0000
+++ b/lib/libc/arch/sparc64/gen/_setjmp.S       Sat Apr 30 19:43:17 2011 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: _setjmp.S,v 1.6 2004/12/07 08:20:07 martin Exp $       */
+/*     $NetBSD: _setjmp.S,v 1.7 2011/04/30 19:43:17 martin Exp $       */
 
 /*
  * Copyright (c) 1992, 1993
@@ -40,10 +40,13 @@
 #if 0
        .asciz "@(#)_setjmp.s   8.1 (Berkeley) 6/4/93"
 #else
-       RCSID("$NetBSD: _setjmp.S,v 1.6 2004/12/07 08:20:07 martin Exp $")
+       RCSID("$NetBSD: _setjmp.S,v 1.7 2011/04/30 19:43:17 martin Exp $")
 #endif
 #endif /* LIBC_SCCS and not lint */
 
+       .register %g2,#ignore
+       .register %g3,#ignore
+
 /*
  * C library -- _setjmp, _longjmp
  *
@@ -57,6 +60,15 @@
 ENTRY(_setjmp)
        stx     %sp, [%o0+0]    /* store caller's stack pointer */
        stx     %o7, [%o0+8]    /* and return pc */
+       stx     %g0, [%o0+0x18] /* mark as non-sigmask jmpbuf */
+
+       /* store globals, offsets compatible with siglongjmp */
+       stx     %g1, [%o0+0x28]
+       stx     %g2, [%o0+0x30]         /* adjust asserts in longjmp.c */
+       stx     %g3, [%o0+0x48]         /* if you change any of these */
+       stx     %g6, [%o0+0x50]         /* offsets! */
+       stx     %g7, [%o0+0x58]
+
        retl
         clr    %o0             ! return 0
 
@@ -68,6 +80,11 @@
         * a `restore' instruction which will reload the register
         * window from the stack.
         */
+       ldx     [%i0+0x28],%g1
+       ldx     [%i0+0x30],%g2
+       ldx     [%i0+0x48],%g3
+       ldx     [%i0+0x50],%g6
+       ldx     [%i0+0x58],%g7
        ldx     [%i0+8], %i7
        ldx     [%i0+0], %fp
        mov     1, %i0