f61b8b8c16
Commit d8f186aa4a ("arch: common: semihost: add semihosting
operations") encapsulated semihosting invocation in a per-arch
semihost_exec() function. There is a fixed register variable declaration
for the return value but this variable is not listed as an output
operand to respective inline assembly segments which is an error.
This is not reported as such by gcc and the generated code is still OK
in those particular instances but this is not guaranteed, and clang
does complain about such cases.
Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
20 lines
495 B
C
20 lines
495 B
C
/*
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* Copyright (c) 2022, Commonwealth Scientific and Industrial Research
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* Organisation (CSIRO) ABN 41 687 119 230.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <zephyr/arch/common/semihost.h>
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long semihost_exec(enum semihost_instr instr, void *args)
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{
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register unsigned long w0 __asm__ ("w0") = instr;
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register void *x1 __asm__ ("x1") = args;
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register long ret __asm__ ("x0");
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__asm__ volatile ("hlt 0xf000"
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: "=r" (ret) : "r" (w0), "r" (x1) : "memory");
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return ret;
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}
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