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https://github.com/brain-hackers/u-boot-brain
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d024236e5a
We have a large number of places where while we historically referenced gd in the code we no longer do, as well as cases where the code added that line "just in case" during development and never dropped it. Signed-off-by: Tom Rini <trini@konsulko.com>
43 lines
1.3 KiB
C
43 lines
1.3 KiB
C
/*
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* (C) Copyright 2008-2011
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* Graeme Russ, <graeme.russ@gmail.com>
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*
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* (C) Copyright 2002
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* Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
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*
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* (C) Copyright 2002
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* Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
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*
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* (C) Copyright 2002
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Marius Groeger <mgroeger@sysgo.de>
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*
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* Copyright 2015 ATS Advanced Telematics Systems GmbH
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* Copyright 2015 Konsulko Group, Matt Porter <mporter@konsulko.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <command.h>
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/*
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* ARMv7M does not support ARM instruction mode. However, the
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* interworking BLX and BX instructions do encode the ARM/Thumb
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* field in bit 0. This means that when executing any Branch
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* and eXchange instruction we must set bit 0 to one to guarantee
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* that we keep the processor in Thumb instruction mode. From The
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* ARMv7-M Instruction Set A4.1.1:
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* "ARMv7-M only supports the Thumb instruction execution state,
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* therefore the value of address bit [0] must be 1 in interworking
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* instructions, otherwise a fault occurs."
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*/
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unsigned long do_go_exec(ulong (*entry)(int, char * const []),
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int argc, char * const argv[])
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{
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ulong addr = (ulong)entry | 1;
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entry = (void *)addr;
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return entry(argc, argv);
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}
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