f05938090b
There are two types of ARM semicall - lets test them both. Putting the logic in a header will make re-using the functions easier later. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
36 lines
732 B
C
36 lines
732 B
C
/*
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* Semihosting Tests
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*
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* Copyright (c) 2019
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* Written by Alex Bennée <alex.bennee@linaro.org>
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*
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* SPDX-License-Identifier: GPL-3.0-or-later
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*/
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#define SYS_WRITE0 0x04
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#define SYS_READC 0x07
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#define SYS_REPORTEXC 0x18
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uintptr_t __semi_call(uintptr_t type, uintptr_t arg0)
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{
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#if defined(__arm__)
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register uintptr_t t asm("r0") = type;
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register uintptr_t a0 asm("r1") = arg0;
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#ifdef __thumb__
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# define SVC "svc 0xab"
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#else
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# define SVC "svc 0x123456"
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#endif
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asm(SVC : "=r" (t)
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: "r" (t), "r" (a0));
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#else
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register uintptr_t t asm("x0") = type;
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register uintptr_t a0 asm("x1") = arg0;
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asm("hlt 0xf000"
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: "=r" (t)
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: "r" (t), "r" (a0));
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#endif
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return t;
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}
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