zephyr/lib/libc/newlib/libc-hooks.c

160 lines
2.9 KiB
C

/*
* Copyright (c) 2015, Intel Corporation.
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <arch/cpu.h>
#include <errno.h>
#include <stdio.h>
#include <sys/stat.h>
#include <linker/linker-defs.h>
#include <misc/util.h>
#define USED_RAM_END_ADDR POINTER_TO_UINT(&_end)
#if CONFIG_X86
#define USED_RAM_SIZE (USED_RAM_END_ADDR - CONFIG_PHYS_RAM_ADDR)
#define MAX_HEAP_SIZE ((KB(CONFIG_RAM_SIZE)) - USED_RAM_SIZE)
#elif CONFIG_NIOS2
#include <layout.h>
#define USED_RAM_SIZE (USED_RAM_END_ADDR - _RAM_ADDR)
#define MAX_HEAP_SIZE (_RAM_SIZE - USED_RAM_SIZE)
#elif CONFIG_RISCV32
#include <soc.h>
#define USED_RAM_SIZE (USED_RAM_END_ADDR - RISCV_RAM_BASE)
#define MAX_HEAP_SIZE (RISCV_RAM_SIZE - USED_RAM_SIZE)
#elif CONFIG_ARM
#include <soc.h>
#define USED_RAM_SIZE (USED_RAM_END_ADDR - CONFIG_SRAM_BASE_ADDRESS)
#define MAX_HEAP_SIZE ((KB(CONFIG_SRAM_SIZE)) - USED_RAM_SIZE)
#elif CONFIG_XTENSA
extern void *_heap_sentry;
#define MAX_HEAP_SIZE (POINTER_TO_UINT(&_heap_sentry) - USED_RAM_END_ADDR)
#else
#define USED_RAM_SIZE (USED_RAM_END_ADDR - CONFIG_SRAM_BASE_ADDRESS)
#define MAX_HEAP_SIZE ((KB(CONFIG_SRAM_SIZE)) - USED_RAM_SIZE)
#endif
static unsigned char *heap_base = UINT_TO_POINTER(USED_RAM_END_ADDR);
static unsigned int heap_sz;
static int _stdout_hook_default(int c)
{
(void)(c); /* Prevent warning about unused argument */
return EOF;
}
static int (*_stdout_hook)(int) = _stdout_hook_default;
void __stdout_hook_install(int (*hook)(int))
{
_stdout_hook = hook;
}
static unsigned char _stdin_hook_default(void)
{
return 0;
}
static unsigned char (*_stdin_hook)(void) = _stdin_hook_default;
void __stdin_hook_install(unsigned char (*hook)(void))
{
_stdin_hook = hook;
}
int _read(int fd, char *buf, int nbytes)
{
int i = 0;
for (i = 0; i < nbytes; i++) {
*(buf + i) = _stdin_hook();
if ((*(buf + i) == '\n') || (*(buf + i) == '\r')) {
i++;
break;
}
}
return i;
}
FUNC_ALIAS(_read, read, int);
int _write(int fd, char *buf, int nbytes)
{
int i;
for (i = 0; i < nbytes; i++) {
if (*(buf + i) == '\n') {
_stdout_hook('\r');
}
_stdout_hook(*(buf + i));
}
return nbytes;
}
FUNC_ALIAS(_write, write, int);
int _isatty(int file)
{
return 1;
}
FUNC_ALIAS(_isatty, isatty, int);
int _kill(int i, int j)
{
return 0;
}
FUNC_ALIAS(_kill, kill, int);
int _getpid(void)
{
return 0;
}
FUNC_ALIAS(_getpid, getpid, int);
int _fstat(int file, struct stat *st)
{
st->st_mode = S_IFCHR;
return 0;
}
FUNC_ALIAS(_fstat, fstat, int);
void _exit(int status)
{
_write(1, "exit", 4);
while (1) {
;
}
}
int _open(const char *name, int mode)
{
return -1;
}
FUNC_ALIAS(_open, open, int);
int _close(int file)
{
return -1;
}
FUNC_ALIAS(_close, close, int);
int _lseek(int file, int ptr, int dir)
{
return 0;
}
FUNC_ALIAS(_lseek, lseek, int);
void *_sbrk(int count)
{
void *ptr = heap_base + heap_sz;
if ((heap_sz + count) < MAX_HEAP_SIZE) {
heap_sz += count;
return ptr;
} else {
return (void *)-1;
}
}
FUNC_ALIAS(_sbrk, sbrk, void *);