1 1.1 riastrad /* $NetBSD: contextspfunc.S,v 1.1 2025/04/21 02:33:45 riastradh Exp $ */ 2 1.1 riastrad 3 1.1 riastrad /*- 4 1.1 riastrad * Copyright (c) 2025 The NetBSD Foundation, Inc. 5 1.1 riastrad * All rights reserved. 6 1.1 riastrad * 7 1.1 riastrad * Redistribution and use in source and binary forms, with or without 8 1.1 riastrad * modification, are permitted provided that the following conditions 9 1.1 riastrad * are met: 10 1.1 riastrad * 1. Redistributions of source code must retain the above copyright 11 1.1 riastrad * notice, this list of conditions and the following disclaimer. 12 1.1 riastrad * 2. Redistributions in binary form must reproduce the above copyright 13 1.1 riastrad * notice, this list of conditions and the following disclaimer in the 14 1.1 riastrad * documentation and/or other materials provided with the distribution. 15 1.1 riastrad * 16 1.1 riastrad * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 1.1 riastrad * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 1.1 riastrad * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 1.1 riastrad * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 1.1 riastrad * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 1.1 riastrad * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 1.1 riastrad * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 1.1 riastrad * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 1.1 riastrad * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 1.1 riastrad * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 1.1 riastrad * POSSIBILITY OF SUCH DAMAGE. 27 1.1 riastrad */ 28 1.1 riastrad 29 1.1 riastrad #define _LOCORE 30 1.1 riastrad 31 1.1 riastrad #include <machine/asm.h> 32 1.1 riastrad 33 1.1 riastrad RCSID("$NetBSD: contextspfunc.S,v 1.1 2025/04/21 02:33:45 riastradh Exp $") 34 1.1 riastrad 35 1.1 riastrad #ifdef __PIC__ 36 1.1 riastrad #define SETHI(label, got, reg) \ 37 1.1 riastrad set label, reg; /* reg := &label - &GOT */ \ 38 1.1 riastrad ld [got + reg], reg /* reg := &label */ 39 1.1 riastrad #define LO(label, reg) \ 40 1.1 riastrad reg 41 1.1 riastrad #else 42 1.1 riastrad #define SETHI(label, got, reg) \ 43 1.1 riastrad sethi %hi(label), reg /* reg := &label - %lo(label) */ 44 1.1 riastrad #define LO(label, reg) \ 45 1.1 riastrad reg + %lo(label) 46 1.1 riastrad #endif 47 1.1 riastrad 48 1.1 riastrad .text 49 1.1 riastrad 50 1.1 riastrad /* 51 1.1 riastrad * contextspfunc() 52 1.1 riastrad * 53 1.1 riastrad * makecontext(3) function. Store the stack pointer on entry at 54 1.1 riastrad * the global variable contextsp and call contextdone. 55 1.1 riastrad */ 56 1.1 riastrad ENTRY(contextspfunc) 57 1.1 riastrad /* Reminder: o6 is frame pointer, o7 + 8 is return address. */ 58 1.1 riastrad PIC_PROLOGUE(%g1, %o5) /* g1 := &GOT, clobber o5 */ 59 1.1 riastrad SETHI(_C_LABEL(contextsp), %g1, %o5) /* o5 := &contextsp */ 60 1.1 riastrad call _C_LABEL(contextdone) /* jump to contextdone */ 61 1.1 riastrad st %sp, [LO(_C_LABEL(contextsp), %o5)] /* contextsp := sp */ 62 1.1 riastrad /* don't care what happens here, caller must never return */ 63 1.1 riastrad ta 1 /* Tcc, trap always */ 64 1.1 riastrad END(contextspfunc) 65
Indexes created Mon Sep 22 13:09:51 GMT 2025