1/*- 2 * Copyright (c) 2002 Peter Grehan. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26/* $NetBSD: cerror.S,v 1.5 2000/01/27 14:58:48 kleink Exp $ */ 27 28#include <machine/asm.h> 29#include "SYS.h" 30 31 .globl HIDENAME(cerror) 32 .globl CNAME(__error) 33 34 /* 35 * The __error() function is thread aware. For non-threaded 36 * programs and the initial thread in threaded programs, 37 * it returns a pointer to the global errno variable. 38 */ 39HIDENAME(cerror): 40 mflr %r0 41 stwu %r1,-20(%r1) /* allocate new stack frame */ 42 stw %r0,24(%r1) /* and save lr, r31 */ 43 stw %r31,12(%r1) 44#ifdef __PIC__ 45 stw %r30,8(%r1) 46 bcl 20,31,1f 471: 48 mflr %r30 49 addis %r30,%r30,_GLOBAL_OFFSET_TABLE_-1b@ha 50 addi %r30,%r30,_GLOBAL_OFFSET_TABLE_-1b@l 51#endif 52 mr %r31,%r3 /* stash errval in callee-saved register */ 53 bl PIC_PLT(CNAME(__error)) 54 stw %r31,0(%r3) /* store errval into &errno */ 55 lwz %r0,24(%r1) 56 lwz %r31,12(%r1) 57#ifdef __PIC__ 58 lwz %r30,8(%r1) 59#endif 60 mtlr %r0 61 la %r1,20(%r1) 62 li %r3,-1 63 li %r4,-1 64 blr /* return to callers caller */ 65 66 .section .note.GNU-stack,"",%progbits 67