12e6aadcb0
The read/write implementations call directly into the console drivers using the hook mechanism, causing faults if invoked from user mode. Add system calls for read() and write() such that we do a privilege elevation first. Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
43 lines
929 B
C
43 lines
929 B
C
/*
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* Copyright (c) 2018, Intel Corporation.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef ZEPHYR_LIBC_HOOKS_H
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#define ZEPHYR_LIBC_HOOKS_H
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#include <toolchain.h>
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#include <stdio.h>
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#include <stddef.h>
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/*
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* Private header for specifying accessory functions to the C library internals
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* that need to call into the kernel as system calls
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*/
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#ifdef CONFIG_NEWLIB_LIBC
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/* syscall generation ignores preprocessor, ensure this is defined to ensure
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* we don't have compile errors
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*/
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#define _MLIBC_RESTRICT
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__syscall int _zephyr_read(char *buf, int nbytes);
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__syscall int _zephyr_write(char *buf, int nbytes);
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#else
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/* Minimal libc */
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__syscall int _zephyr_fputc(int c, FILE *stream);
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__syscall size_t _zephyr_fwrite(const void *_MLIBC_RESTRICT ptr, size_t size,
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size_t nitems, FILE *_MLIBC_RESTRICT stream);
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#endif /* CONFIG_NEWLIB_LIBC */
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#include <syscalls/libc-hooks.h>
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#endif /* ZEPHYR_LIBC_HOOKS_H */
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