/* * Copyright (c) 2015 Petr Pavlu * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * - 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. * - The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. */ #include <abi/asmtool.h> #include <arch/context_struct.h> .text /* Static checks for the context_t save/load. */ #if CONTEXT_OFFSET_SP + 8 != CONTEXT_OFFSET_PC #error sp and pc are not successive in context_t #endif #if CONTEXT_OFFSET_X19 + 8 != CONTEXT_OFFSET_X20 #error x19 and x20 are not successive in context_t #endif #if CONTEXT_OFFSET_X21 + 8 != CONTEXT_OFFSET_X22 #error x21 and x22 are not successive in context_t #endif #if CONTEXT_OFFSET_X23 + 8 != CONTEXT_OFFSET_X24 #error x23 and x24 are not successive in context_t #endif #if CONTEXT_OFFSET_X25 + 8 != CONTEXT_OFFSET_X26 #error x25 and x26 are not successive in context_t #endif #if CONTEXT_OFFSET_X27 + 8 != CONTEXT_OFFSET_X28 #error x27 and x28 are not successive in context_t #endif FUNCTION_BEGIN(context_save_arch) /* Save callee-saved registers into context_t pointed by x0. */ mov x1, sp stp x1, x30, [x0, #CONTEXT_OFFSET_SP] stp x19, x20, [x0, #CONTEXT_OFFSET_X19] stp x21, x22, [x0, #CONTEXT_OFFSET_X21] stp x23, x24, [x0, #CONTEXT_OFFSET_X23] stp x25, x26, [x0, #CONTEXT_OFFSET_X25] stp x27, x28, [x0, #CONTEXT_OFFSET_X27] str x29, [x0, #CONTEXT_OFFSET_X29] /* Return 1. */ mov x0, #1 ret FUNCTION_END(context_save_arch) FUNCTION_BEGIN(context_restore_arch) /* Restore callee-saved registers from context_t pointed by x0. */ ldp x1, x30, [x0, #CONTEXT_OFFSET_SP] mov sp, x1 ldp x19, x20, [x0, #CONTEXT_OFFSET_X19] ldp x21, x22, [x0, #CONTEXT_OFFSET_X21] ldp x23, x24, [x0, #CONTEXT_OFFSET_X23] ldp x25, x26, [x0, #CONTEXT_OFFSET_X25] ldp x27, x28, [x0, #CONTEXT_OFFSET_X27] ldr x29, [x0, #CONTEXT_OFFSET_X29] /* Return 0. */ mov x0, #0 ret FUNCTION_END(context_restore_arch)