blob: 74c5c563a62db375da32e926b592e11ba7015e3f [file] [log] [blame]
/*
* Copyright (c) 2018, Intel Corporation.
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifndef ZEPHYR_INCLUDE_SYS_LIBC_HOOKS_H_
#define ZEPHYR_INCLUDE_SYS_LIBC_HOOKS_H_
#include <toolchain.h>
#include <stdio.h>
#include <stddef.h>
/*
* Private header for specifying accessory functions to the C library internals
* that need to call into the kernel as system calls
*/
#if defined(CONFIG_NEWLIB_LIBC) || defined(CONFIG_ARCMWDT_LIBC)
/* syscall generation ignores preprocessor, ensure this is defined to ensure
* we don't have compile errors
*/
#define _MLIBC_RESTRICT
__syscall int zephyr_read_stdin(char *buf, int nbytes);
__syscall int zephyr_write_stdout(const void *buf, int nbytes);
#else
/* Minimal libc */
__syscall int zephyr_fputc(int c, FILE * stream);
__syscall size_t zephyr_fwrite(const void *_MLIBC_RESTRICT ptr, size_t size,
size_t nitems, FILE *_MLIBC_RESTRICT stream);
#endif /* CONFIG_NEWLIB_LIBC */
#ifdef CONFIG_USERSPACE
#if defined(CONFIG_NEWLIB_LIBC)
/* If we are using newlib, the heap arena is in one of two areas:
* - If we have an MPU that requires power of two alignment, the heap bounds
* must be specified in Kconfig via CONFIG_NEWLIB_LIBC_ALIGNED_HEAP_SIZE.
* - Otherwise, the heap arena on most arches starts at a suitably
* aligned base addreess after the `_end` linker symbol, through to the end
* of system RAM.
*/
#if (!defined(CONFIG_MPU_REQUIRES_POWER_OF_TWO_ALIGNMENT) || \
(defined(CONFIG_MPU_REQUIRES_POWER_OF_TWO_ALIGNMENT) && \
CONFIG_NEWLIB_LIBC_ALIGNED_HEAP_SIZE))
#define Z_MALLOC_PARTITION_EXISTS 1
extern struct k_mem_partition z_malloc_partition;
#endif
#elif defined(CONFIG_MINIMAL_LIBC)
#if (CONFIG_MINIMAL_LIBC_MALLOC_ARENA_SIZE > 0)
/* Minimal libc by default has no malloc arena, its size must be set in
* Kconfig via CONFIG_MINIMAL_LIBC_MALLOC_ARENA_SIZE
*/
#define Z_MALLOC_PARTITION_EXISTS 1
#endif /* CONFIG_MINIMAL_LIBC_MALLOC_ARENA_SIZE > 0 */
#endif /* CONFIG_MINIMAL_LIBC */
#ifdef Z_MALLOC_PARTITION_EXISTS
/* Memory partition containing the libc malloc arena. Configuration controls
* whether this is available, and an arena size may need to be set.
*/
extern struct k_mem_partition z_malloc_partition;
#endif
#if defined(CONFIG_NEWLIB_LIBC) || defined(CONFIG_STACK_CANARIES) || \
defined(CONFIG_NEED_LIBC_MEM_PARTITION)
/* - All newlib globals will be placed into z_libc_partition.
* - Minimal C library globals, if any, will be placed into
* z_libc_partition.
* - Stack canary globals will be placed into z_libc_partition since
* it is not worth placing in its own partition.
* - Some architectures may place the global pointer to the thread local
* storage in z_libc_partition since it is not worth placing in its
* own partition.
*/
#define Z_LIBC_PARTITION_EXISTS 1
/* C library globals, except the malloc arena */
extern struct k_mem_partition z_libc_partition;
#endif
#endif /* CONFIG_USERSPACE */
#include <syscalls/libc-hooks.h>
#endif /* ZEPHYR_INCLUDE_SYS_LIBC_HOOKS_H_ */