7707060959
We used to leave byte-long placeholder symbols to ensure that empty application memory sections did not cause build errors that were very difficult to understand. Now we use some relatively portable inline assembly to generate a symbol, but don't take up any extra space. The malloc and libc partitions are now only instantiated if there is some data to put in them. Fixes: #13923 Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
61 lines
1.6 KiB
C
61 lines
1.6 KiB
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_INCLUDE_MISC_LIBC_HOOKS_H_
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#define ZEPHYR_INCLUDE_MISC_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_stdin(char *buf, int nbytes);
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__syscall int _zephyr_write_stdout(const void *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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#ifdef CONFIG_USERSPACE
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#if defined(CONFIG_NEWLIB_LIBC) || (CONFIG_MINIMAL_LIBC_MALLOC_ARENA_SIZE > 0)
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#define Z_MALLOC_PARTITION_EXISTS 1
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/* Memory partition containing the libc malloc arena */
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extern struct k_mem_partition z_malloc_partition;
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#endif
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#if defined(CONFIG_NEWLIB_LIBC) || defined(CONFIG_STACK_CANARIES)
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/* Minimal libc has no globals. We do put the stack canary global in the
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* libc partition since it is not worth placing in a partition of its own.
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*/
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#define Z_LIBC_PARTITION_EXISTS 1
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/* C library globals, except the malloc arena */
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extern struct k_mem_partition z_libc_partition;
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#endif
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#endif /* CONFIG_USERSPACE */
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#include <syscalls/libc-hooks.h>
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#endif /* ZEPHYR_INCLUDE_MISC_LIBC_HOOKS_H_ */
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