1/* 2 * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * Redistributions of source code must retain the above copyright notice, this 8 * list of conditions and the following disclaimer. 9 * 10 * Redistributions in binary form must reproduce the above copyright notice, 11 * this list of conditions and the following disclaimer in the documentation 12 * and/or other materials provided with the distribution. 13 * 14 * Neither the name of ARM nor the names of its contributors may be used 15 * to endorse or promote products derived from this software without specific 16 * prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31#include <asm_macros.S> 32 33.macro push ra, rb, sp=sp 34 stp \ra, \rb, [\sp,#-16]! 35.endm 36 37.macro pop ra, rb, sp=sp 38 ldp \ra, \rb, [\sp], #16 39.endm 40 41 .global trusty_context_switch_helper 42func trusty_context_switch_helper 43 push x8, xzr 44 push x19, x20 45 push x21, x22 46 push x23, x24 47 push x25, x26 48 push x27, x28 49 push x29, x30 50 51 mov x9, sp 52 ldr x10, [x0] 53 mov sp, x10 54 str x9, [x0] 55 56 pop x29, x30 57 pop x27, x28 58 pop x25, x26 59 pop x23, x24 60 pop x21, x22 61 pop x19, x20 62 pop x8, xzr 63 stp x1, x2, [x8] 64 stp x3, x4, [x8, #16] 65 66 ret 67endfunc trusty_context_switch_helper 68 69 .global trusty_init_context_stack 70func trusty_init_context_stack 71 push x8, xzr, x1 72 push xzr, xzr, x1 73 push xzr, xzr, x1 74 push xzr, xzr, x1 75 push xzr, xzr, x1 76 push xzr, xzr, x1 77 adr x9, el3_exit 78 push xzr, x9, x1 79 str x1, [x0] 80 ret 81endfunc trusty_init_context_stack 82