diff options
Diffstat (limited to 'kernel/arch/sparc/contextspfunc.S')
| -rw-r--r-- | kernel/arch/sparc/contextspfunc.S | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/kernel/arch/sparc/contextspfunc.S b/kernel/arch/sparc/contextspfunc.S new file mode 100644 index 000000000000..a24185cabd73 --- /dev/null +++ b/kernel/arch/sparc/contextspfunc.S @@ -0,0 +1,64 @@ +/* $NetBSD: contextspfunc.S,v 1.1 2025/04/21 02:33:45 riastradh Exp $ */ + +/*- + * Copyright (c) 2025 The NetBSD Foundation, Inc. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS + * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED + * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS + * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#define _LOCORE + +#include <machine/asm.h> + +RCSID("$NetBSD: contextspfunc.S,v 1.1 2025/04/21 02:33:45 riastradh Exp $") + +#ifdef __PIC__ +#define SETHI(label, got, reg) \ + set label, reg; /* reg := &label - &GOT */ \ + ld [got + reg], reg /* reg := &label */ +#define LO(label, reg) \ + reg +#else +#define SETHI(label, got, reg) \ + sethi %hi(label), reg /* reg := &label - %lo(label) */ +#define LO(label, reg) \ + reg + %lo(label) +#endif + + .text + +/* + * contextspfunc() + * + * makecontext(3) function. Store the stack pointer on entry at + * the global variable contextsp and call contextdone. + */ +ENTRY(contextspfunc) + /* Reminder: o6 is frame pointer, o7 + 8 is return address. */ + PIC_PROLOGUE(%g1, %o5) /* g1 := &GOT, clobber o5 */ + SETHI(_C_LABEL(contextsp), %g1, %o5) /* o5 := &contextsp */ + call _C_LABEL(contextdone) /* jump to contextdone */ + st %sp, [LO(_C_LABEL(contextsp), %o5)] /* contextsp := sp */ + /* don't care what happens here, caller must never return */ + ta 1 /* Tcc, trap always */ +END(contextspfunc) |