1*83d290c5STom Rini // SPDX-License-Identifier: GPL-2.0+ 2f99993c1SMatt Porter /* 3f99993c1SMatt Porter * (C) Copyright 2008-2011 4f99993c1SMatt Porter * Graeme Russ, <graeme.russ@gmail.com> 5f99993c1SMatt Porter * 6f99993c1SMatt Porter * (C) Copyright 2002 7f99993c1SMatt Porter * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se> 8f99993c1SMatt Porter * 9f99993c1SMatt Porter * (C) Copyright 2002 10f99993c1SMatt Porter * Wolfgang Denk, DENX Software Engineering, <wd@denx.de> 11f99993c1SMatt Porter * 12f99993c1SMatt Porter * (C) Copyright 2002 13f99993c1SMatt Porter * Sysgo Real-Time Solutions, GmbH <www.elinos.com> 14f99993c1SMatt Porter * Marius Groeger <mgroeger@sysgo.de> 15f99993c1SMatt Porter * 16f99993c1SMatt Porter * Copyright 2015 ATS Advanced Telematics Systems GmbH 17f99993c1SMatt Porter * Copyright 2015 Konsulko Group, Matt Porter <mporter@konsulko.com> 18f99993c1SMatt Porter */ 19f99993c1SMatt Porter 20f99993c1SMatt Porter #include <common.h> 21f99993c1SMatt Porter #include <command.h> 22f99993c1SMatt Porter 23f99993c1SMatt Porter /* 24f99993c1SMatt Porter * ARMv7M does not support ARM instruction mode. However, the 25f99993c1SMatt Porter * interworking BLX and BX instructions do encode the ARM/Thumb 26f99993c1SMatt Porter * field in bit 0. This means that when executing any Branch 27f99993c1SMatt Porter * and eXchange instruction we must set bit 0 to one to guarantee 28f99993c1SMatt Porter * that we keep the processor in Thumb instruction mode. From The 29f99993c1SMatt Porter * ARMv7-M Instruction Set A4.1.1: 30f99993c1SMatt Porter * "ARMv7-M only supports the Thumb instruction execution state, 31f99993c1SMatt Porter * therefore the value of address bit [0] must be 1 in interworking 32f99993c1SMatt Porter * instructions, otherwise a fault occurs." 33f99993c1SMatt Porter */ 34f99993c1SMatt Porter unsigned long do_go_exec(ulong (*entry)(int, char * const []), 35f99993c1SMatt Porter int argc, char * const argv[]) 36f99993c1SMatt Porter { 37f99993c1SMatt Porter ulong addr = (ulong)entry | 1; 38f99993c1SMatt Porter entry = (void *)addr; 39f99993c1SMatt Porter 40f99993c1SMatt Porter return entry(argc, argv); 41f99993c1SMatt Porter } 42