Diff: platform/retarget.cpp

Revision:

0:f269e3021894

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/platform/retarget.cpp	Sun Oct 23 15:10:02 2016 +0000
@@ -0,0 +1,853 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2015 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include "platform/platform.h"
+#include "drivers/FileHandle.h"
+#include "drivers/FileSystemLike.h"
+#include "drivers/FilePath.h"
+#include "hal/serial_api.h"
+#include "platform/toolchain.h"
+#include "platform/semihost_api.h"
+#include "platform/mbed_interface.h"
+#include "platform/SingletonPtr.h"
+#include "platform/PlatformMutex.h"
+#include "platform/mbed_error.h"
+#include "platform/mbed_stats.h"
+#include <stdlib.h>
+#include <string.h>
+#if DEVICE_STDIO_MESSAGES
+#include <stdio.h>
+#endif
+#include <errno.h>
+
+#if defined(__ARMCC_VERSION)
+#   include <rt_sys.h>
+#   define PREFIX(x)    _sys##x
+#   define OPEN_MAX     _SYS_OPEN
+#   ifdef __MICROLIB
+#       pragma import(__use_full_stdio)
+#   endif
+
+#elif defined(__ICCARM__)
+#   include <yfuns.h>
+#   define PREFIX(x)        _##x
+#   define OPEN_MAX         16
+
+#   define STDIN_FILENO     0
+#   define STDOUT_FILENO    1
+#   define STDERR_FILENO    2
+
+#else
+#   include <sys/stat.h>
+#   include <sys/unistd.h>
+#   include <sys/syslimits.h>
+#   define PREFIX(x)    x
+#endif
+
+#define FILE_HANDLE_RESERVED    0xFFFFFFFF
+
+using namespace mbed;
+
+#if defined(__MICROLIB) && (__ARMCC_VERSION>5030000)
+// Before version 5.03, we were using a patched version of microlib with proper names
+extern const char __stdin_name[]  = ":tt";
+extern const char __stdout_name[] = ":tt";
+extern const char __stderr_name[] = ":tt";
+
+#else
+extern const char __stdin_name[]  = "/stdin";
+extern const char __stdout_name[] = "/stdout";
+extern const char __stderr_name[] = "/stderr";
+#endif
+
+// Heap limits - only used if set
+unsigned char *mbed_heap_start = 0;
+uint32_t mbed_heap_size = 0;
+
+/* newlib has the filehandle field in the FILE struct as a short, so
+ * we can't just return a Filehandle* from _open and instead have to
+ * put it in a filehandles array and return the index into that array
+ * (or rather index+3, as filehandles 0-2 are stdin/out/err).
+ */
+static FileHandle *filehandles[OPEN_MAX];
+static SingletonPtr<PlatformMutex> filehandle_mutex;
+
+FileHandle::~FileHandle() {
+    filehandle_mutex->lock();
+    /* Remove all open filehandles for this */
+    for (unsigned int fh_i = 0; fh_i < sizeof(filehandles)/sizeof(*filehandles); fh_i++) {
+        if (filehandles[fh_i] == this) {
+            filehandles[fh_i] = NULL;
+        }
+    }
+    filehandle_mutex->unlock();
+}
+
+#if DEVICE_SERIAL
+extern int stdio_uart_inited;
+extern serial_t stdio_uart;
+#if MBED_CONF_PLATFORM_STDIO_CONVERT_NEWLINES
+static char stdio_in_prev;
+static char stdio_out_prev;
+#endif
+#endif
+
+static void init_serial() {
+#if DEVICE_SERIAL
+    if (stdio_uart_inited) return;
+    serial_init(&stdio_uart, STDIO_UART_TX, STDIO_UART_RX);
+#if MBED_CONF_PLATFORM_STDIO_BAUD_RATE
+    serial_baud(&stdio_uart, MBED_CONF_PLATFORM_STDIO_BAUD_RATE);
+#endif
+#endif
+}
+
+static inline int openmode_to_posix(int openmode) {
+    int posix = openmode;
+#ifdef __ARMCC_VERSION
+    if (openmode & OPEN_PLUS) {
+        posix = O_RDWR;
+    } else if(openmode & OPEN_W) {
+        posix = O_WRONLY;
+    } else if(openmode & OPEN_A) {
+        posix = O_WRONLY|O_APPEND;
+    } else {
+        posix = O_RDONLY;
+    }
+    /* a, w, a+, w+ all create if file does not already exist */
+    if (openmode & (OPEN_A|OPEN_W)) {
+        posix |= O_CREAT;
+    }
+    /* w and w+ truncate */
+    if (openmode & OPEN_W) {
+        posix |= O_TRUNC;
+    }
+#elif defined(__ICCARM__)
+    switch (openmode & _LLIO_RDWRMASK) {
+        case _LLIO_RDONLY: posix = O_RDONLY; break;
+        case _LLIO_WRONLY: posix = O_WRONLY; break;
+        case _LLIO_RDWR  : posix = O_RDWR  ; break;
+    }
+    if (openmode & _LLIO_CREAT ) posix |= O_CREAT;
+    if (openmode & _LLIO_APPEND) posix |= O_APPEND;
+    if (openmode & _LLIO_TRUNC ) posix |= O_TRUNC;
+#elif defined(TOOLCHAIN_GCC)
+    posix &= ~O_BINARY;
+#endif
+    return posix;
+}
+
+extern "C" WEAK void mbed_sdk_init(void);
+extern "C" WEAK void mbed_sdk_init(void) {
+}
+
+extern "C" FILEHANDLE PREFIX(_open)(const char* name, int openmode) {
+    #if defined(__MICROLIB) && (__ARMCC_VERSION>5030000)
+    // Before version 5.03, we were using a patched version of microlib with proper names
+    // This is the workaround that the microlib author suggested us
+    static int n = 0;
+    static int mbed_sdk_inited = 0;
+    if (!mbed_sdk_inited) {
+        mbed_sdk_inited = 1;
+        mbed_sdk_init();
+    }
+    if (!std::strcmp(name, ":tt")) return n++;
+    #else
+    /* Use the posix convention that stdin,out,err are filehandles 0,1,2.
+     */
+    if (std::strcmp(name, __stdin_name) == 0) {
+        init_serial();
+        return 0;
+    } else if (std::strcmp(name, __stdout_name) == 0) {
+        init_serial();
+        return 1;
+    } else if (std::strcmp(name, __stderr_name) == 0) {
+        init_serial();
+        return 2;
+    }
+    #endif
+
+    // find the first empty slot in filehandles
+    filehandle_mutex->lock();
+    unsigned int fh_i;
+    for (fh_i = 0; fh_i < sizeof(filehandles)/sizeof(*filehandles); fh_i++) {
+        if (filehandles[fh_i] == NULL) break;
+    }
+    if (fh_i >= sizeof(filehandles)/sizeof(*filehandles)) {
+        filehandle_mutex->unlock();
+        return -1;
+    }
+    filehandles[fh_i] = (FileHandle*)FILE_HANDLE_RESERVED;
+    filehandle_mutex->unlock();
+
+    FileHandle *res;
+
+    /* FILENAME: ":0x12345678" describes a FileLike* */
+    if (name[0] == ':') {
+        void *p;
+        sscanf(name, ":%p", &p);
+        res = (FileHandle*)p;
+
+    /* FILENAME: "/file_system/file_name" */
+    } else {
+        FilePath path(name);
+
+        if (!path.exists()) {
+            // Free file handle
+            filehandles[fh_i] = NULL;
+            return -1;
+        } else if (path.isFile()) {
+            res = path.file();
+        } else {
+            FileSystemLike *fs = path.fileSystem();
+            if (fs == NULL) {
+                // Free file handle
+                filehandles[fh_i] = NULL;
+                return -1;
+            }
+            int posix_mode = openmode_to_posix(openmode);
+            res = fs->open(path.fileName(), posix_mode); /* NULL if fails */
+        }
+    }
+
+    if (res == NULL) {
+        // Free file handle
+        filehandles[fh_i] = NULL;
+        return -1;
+    }
+    filehandles[fh_i] = res;
+
+    return fh_i + 3; // +3 as filehandles 0-2 are stdin/out/err
+}
+
+extern "C" int PREFIX(_close)(FILEHANDLE fh) {
+    if (fh < 3) return 0;
+
+    FileHandle* fhc = filehandles[fh-3];
+    filehandles[fh-3] = NULL;
+    if (fhc == NULL) return -1;
+
+    return fhc->close();
+}
+
+#if defined(__ICCARM__)
+extern "C" size_t    __write (int        fh, const unsigned char *buffer, size_t length) {
+#else
+extern "C" int PREFIX(_write)(FILEHANDLE fh, const unsigned char *buffer, unsigned int length, int mode) {
+#endif
+    int n; // n is the number of bytes written
+    if (fh < 3) {
+#if DEVICE_SERIAL
+        if (!stdio_uart_inited) init_serial();
+#if MBED_CONF_PLATFORM_STDIO_CONVERT_NEWLINES
+        for (unsigned int i = 0; i < length; i++) {
+            if (buffer[i] == '\n' && stdio_out_prev != '\r') {
+                 serial_putc(&stdio_uart, '\r');
+            }
+            serial_putc(&stdio_uart, buffer[i]);
+            stdio_out_prev = buffer[i];
+        }
+#else
+        for (unsigned int i = 0; i < length; i++) {
+            serial_putc(&stdio_uart, buffer[i]);
+        }
+#endif
+#endif
+        n = length;
+    } else {
+        FileHandle* fhc = filehandles[fh-3];
+        if (fhc == NULL) return -1;
+
+        n = fhc->write(buffer, length);
+    }
+#ifdef __ARMCC_VERSION
+    return length-n;
+#else
+    return n;
+#endif
+}
+
+#if defined(__ICCARM__)
+extern "C" size_t    __read (int        fh, unsigned char *buffer, size_t       length) {
+#else
+extern "C" int PREFIX(_read)(FILEHANDLE fh, unsigned char *buffer, unsigned int length, int mode) {
+#endif
+    int n; // n is the number of bytes read
+    if (fh < 3) {
+        // only read a character at a time from stdin
+#if DEVICE_SERIAL
+        if (!stdio_uart_inited) init_serial();
+#if MBED_CONF_PLATFORM_STDIO_CONVERT_NEWLINES
+        while (true) {
+            char c = serial_getc(&stdio_uart);
+            if ((c == '\r' && stdio_in_prev != '\n') ||
+                (c == '\n' && stdio_in_prev != '\r')) {
+                stdio_in_prev = c;
+                *buffer = '\n';
+                break;
+            } else if ((c == '\r' && stdio_in_prev == '\n') ||
+                       (c == '\n' && stdio_in_prev == '\r')) {
+                stdio_in_prev = c;
+                // onto next character
+                continue;
+            } else {
+                stdio_in_prev = c;
+                *buffer = c;
+                break;
+            }
+        }
+#else
+        *buffer = serial_getc(&stdio_uart);
+#endif
+#endif
+        n = 1;
+    } else {
+        FileHandle* fhc = filehandles[fh-3];
+        if (fhc == NULL) return -1;
+
+        n = fhc->read(buffer, length);
+    }
+#ifdef __ARMCC_VERSION
+    return length-n;
+#else
+    return n;
+#endif
+}
+
+#ifdef __ARMCC_VERSION
+extern "C" int PREFIX(_istty)(FILEHANDLE fh)
+#else
+extern "C" int _isatty(FILEHANDLE fh)
+#endif
+{
+    /* stdin, stdout and stderr should be tty */
+    if (fh < 3) return 1;
+
+    FileHandle* fhc = filehandles[fh-3];
+    if (fhc == NULL) return -1;
+
+    return fhc->isatty();
+}
+
+extern "C"
+#if defined(__ARMCC_VERSION)
+int _sys_seek(FILEHANDLE fh, long position)
+#elif defined(__ICCARM__)
+long __lseek(int fh, long offset, int whence)
+#else
+int _lseek(FILEHANDLE fh, int offset, int whence)
+#endif
+{
+    if (fh < 3) return 0;
+
+    FileHandle* fhc = filehandles[fh-3];
+    if (fhc == NULL) return -1;
+
+#if defined(__ARMCC_VERSION)
+    return fhc->lseek(position, SEEK_SET);
+#else
+    return fhc->lseek(offset, whence);
+#endif
+}
+
+#ifdef __ARMCC_VERSION
+extern "C" int PREFIX(_ensure)(FILEHANDLE fh) {
+    if (fh < 3) return 0;
+
+    FileHandle* fhc = filehandles[fh-3];
+    if (fhc == NULL) return -1;
+
+    return fhc->fsync();
+}
+
+extern "C" long PREFIX(_flen)(FILEHANDLE fh) {
+    if (fh < 3) return 0;
+
+    FileHandle* fhc = filehandles[fh-3];
+    if (fhc == NULL) return -1;
+
+    return fhc->flen();
+}
+#endif
+
+
+#if !defined(__ARMCC_VERSION) && !defined(__ICCARM__)
+extern "C" int _fstat(int fd, struct stat *st) {
+    if ((STDOUT_FILENO == fd) || (STDERR_FILENO == fd) || (STDIN_FILENO == fd)) {
+        st->st_mode = S_IFCHR;
+        return  0;
+    }
+
+    errno = EBADF;
+    return -1;
+}
+#endif
+
+namespace std {
+extern "C" int remove(const char *path) {
+    FilePath fp(path);
+    FileSystemLike *fs = fp.fileSystem();
+    if (fs == NULL) return -1;
+
+    return fs->remove(fp.fileName());
+}
+
+extern "C" int rename(const char *oldname, const char *newname) {
+    FilePath fpOld(oldname);
+    FilePath fpNew(newname);
+    FileSystemLike *fsOld = fpOld.fileSystem();
+    FileSystemLike *fsNew = fpNew.fileSystem();
+
+    /* rename only if both files are on the same FS */
+    if (fsOld != fsNew || fsOld == NULL) return -1;
+
+    return fsOld->rename(fpOld.fileName(), fpNew.fileName());
+}
+
+extern "C" char *tmpnam(char *s) {
+    return NULL;
+}
+
+extern "C" FILE *tmpfile() {
+    return NULL;
+}
+} // namespace std
+
+#ifdef __ARMCC_VERSION
+extern "C" char *_sys_command_string(char *cmd, int len) {
+    return NULL;
+}
+#endif
+
+extern "C" DIR *opendir(const char *path) {
+    /* root dir is FileSystemLike */
+    if (path[0] == '/' && path[1] == 0) {
+        return FileSystemLike::opendir();
+    }
+
+    FilePath fp(path);
+    FileSystemLike* fs = fp.fileSystem();
+    if (fs == NULL) return NULL;
+
+    return fs->opendir(fp.fileName());
+}
+
+extern "C" struct dirent *readdir(DIR *dir) {
+    return dir->readdir();
+}
+
+extern "C" int closedir(DIR *dir) {
+    return dir->closedir();
+}
+
+extern "C" void rewinddir(DIR *dir) {
+    dir->rewinddir();
+}
+
+extern "C" off_t telldir(DIR *dir) {
+    return dir->telldir();
+}
+
+extern "C" void seekdir(DIR *dir, off_t off) {
+    dir->seekdir(off);
+}
+
+extern "C" int mkdir(const char *path, mode_t mode) {
+    FilePath fp(path);
+    FileSystemLike *fs = fp.fileSystem();
+    if (fs == NULL) return -1;
+
+    return fs->mkdir(fp.fileName(), mode);
+}
+
+#if defined(TOOLCHAIN_GCC)
+/* prevents the exception handling name demangling code getting pulled in */
+#include "mbed_error.h"
+namespace __gnu_cxx {
+    void __verbose_terminate_handler() {
+        error("Exception");
+    }
+}
+extern "C" WEAK void __cxa_pure_virtual(void);
+extern "C" WEAK void __cxa_pure_virtual(void) {
+    exit(1);
+}
+
+#endif
+
+#if defined(TOOLCHAIN_GCC)
+
+#ifdef  FEATURE_UVISOR
+#include "uvisor-lib/uvisor-lib.h"
+#endif/* FEATURE_UVISOR */
+
+
+extern "C" WEAK void software_init_hook_rtos(void)
+{
+    // Do nothing by default.
+}
+
+extern "C" void software_init_hook(void)
+{
+#ifdef   FEATURE_UVISOR
+    int return_code;
+
+    return_code = uvisor_lib_init();
+    if (return_code) {
+        mbed_die();
+    }
+#endif/* FEATURE_UVISOR */
+    mbed_sdk_init();
+    software_init_hook_rtos();
+}
+#endif
+
+// ****************************************************************************
+// mbed_main is a function that is called before main()
+// mbed_sdk_init() is also a function that is called before main(), but unlike
+// mbed_main(), it is not meant for user code, but for the SDK itself to perform
+// initializations before main() is called.
+
+extern "C" WEAK void mbed_main(void);
+extern "C" WEAK void mbed_main(void) {
+}
+
+#if defined(TOOLCHAIN_ARM)
+extern "C" int $Super$$main(void);
+
+extern "C" int $Sub$$main(void) {
+    mbed_main();
+    return $Super$$main();
+}
+
+extern "C" void _platform_post_stackheap_init (void) {
+    mbed_sdk_init();
+}
+
+#elif defined(TOOLCHAIN_GCC)
+extern "C" int __real_main(void);
+
+extern "C" int __wrap_main(void) {
+    mbed_main();
+    return __real_main();
+}
+#elif defined(TOOLCHAIN_IAR)
+// IAR doesn't have the $Super/$Sub mechanism of armcc, nor something equivalent
+// to ld's --wrap. It does have a --redirect, but that doesn't help, since redirecting
+// 'main' to another symbol looses the original 'main' symbol. However, its startup
+// code will call a function to setup argc and argv (__iar_argc_argv) if it is defined.
+// Since mbed doesn't use argc/argv, we use this function to call our mbed_main.
+extern "C" void __iar_argc_argv() {
+    mbed_main();
+}
+#endif
+
+// Provide implementation of _sbrk (low-level dynamic memory allocation
+// routine) for GCC_ARM which compares new heap pointer with MSP instead of
+// SP.  This make it compatible with RTX RTOS thread stacks.
+#if defined(TOOLCHAIN_GCC_ARM) || defined(TOOLCHAIN_GCC_CR)
+// Linker defined symbol used by _sbrk to indicate where heap should start.
+extern "C" int __end__;
+
+#if defined(TARGET_CORTEX_A)
+extern "C" uint32_t  __HeapLimit;
+#endif
+
+// Turn off the errno macro and use actual global variable instead.
+#undef errno
+extern "C" int errno;
+
+// For ARM7 only
+register unsigned char * stack_ptr __asm ("sp");
+
+// Dynamic memory allocation related syscall.
+#if defined(TARGET_NUMAKER_PFM_NUC472) || defined(TARGET_NUMAKER_PFM_M453)
+// Overwrite _sbrk() to support two region model (heap and stack are two distinct regions).
+// __wrap__sbrk() is implemented in:
+// TARGET_NUMAKER_PFM_NUC472    hal/targets/cmsis/TARGET_NUVOTON/TARGET_NUC472/TARGET_NUMAKER_PFM_NUC472/TOOLCHAIN_GCC_ARM/retarget.c
+// TARGET_NUMAKER_PFM_M453      hal/targets/cmsis/TARGET_NUVOTON/TARGET_M451/TARGET_NUMAKER_PFM_M453/TOOLCHAIN_GCC_ARM/retarget.c
+extern "C" void *__wrap__sbrk(int incr);
+extern "C" caddr_t _sbrk(int incr) {
+    return (caddr_t) __wrap__sbrk(incr);
+}
+#else
+extern "C" caddr_t _sbrk(int incr) {
+    static unsigned char* heap = (unsigned char*)&__end__;
+    unsigned char*        prev_heap = heap;
+    unsigned char*        new_heap = heap + incr;
+
+#if defined(TARGET_ARM7)
+    if (new_heap >= stack_ptr) {
+#elif defined(TARGET_CORTEX_A)
+    if (new_heap >= (unsigned char*)&__HeapLimit) {     /* __HeapLimit is end of heap section */
+#else
+    if (new_heap >= (unsigned char*)__get_MSP()) {
+#endif
+        errno = ENOMEM;
+        return (caddr_t)-1;
+    }
+
+    // Additional heap checking if set
+    if (mbed_heap_size && (new_heap >= mbed_heap_start + mbed_heap_size)) {
+        errno = ENOMEM;
+        return (caddr_t)-1;
+    }
+
+    heap = new_heap;
+    return (caddr_t) prev_heap;
+}
+#endif
+#endif
+
+#if defined(TOOLCHAIN_GCC_ARM) || defined(TOOLCHAIN_GCC_CR)
+extern "C" void _exit(int return_code) {
+#else
+namespace std {
+extern "C" void exit(int return_code) {
+#endif
+
+#if DEVICE_STDIO_MESSAGES
+#if MBED_CONF_PLATFORM_STDIO_FLUSH_AT_EXIT
+    fflush(stdout);
+    fflush(stderr);
+#endif
+#endif
+
+#if DEVICE_SEMIHOST
+    if (mbed_interface_connected()) {
+        semihost_exit();
+    }
+#endif
+    if (return_code) {
+        mbed_die();
+    }
+
+    while (1);
+}
+
+#if !defined(TOOLCHAIN_GCC_ARM) && !defined(TOOLCHAIN_GCC_CR)
+} //namespace std
+#endif
+
+#if defined(TOOLCHAIN_ARM) || defined(TOOLCHAIN_GCC)
+
+// This series of function disable the registration of global destructors
+// in a dynamic table which will be called when the application exit.
+// In mbed, program never exit properly, it dies.
+// More informations about this topic for ARMCC here:
+// http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.faqs/6449.html
+extern "C" {
+int __aeabi_atexit(void *object, void (*dtor)(void* /*this*/), void *handle) {
+    return 1;
+}
+
+int __cxa_atexit(void (*dtor)(void* /*this*/), void *object, void *handle) {
+    return 1;
+}
+
+void __cxa_finalize(void *handle) {
+}
+
+} // end of extern "C"
+
+#endif
+
+
+#if defined(TOOLCHAIN_GCC)
+
+/*
+ * Depending on how newlib is  configured, it is often not enough to define
+ * __aeabi_atexit, __cxa_atexit and __cxa_finalize in order to override the
+ * behavior regarding the registration of handlers with atexit.
+ *
+ * To overcome this limitation, exit and atexit are overriden here.
+ */
+extern "C"{
+
+/**
+ * @brief Retarget of exit for GCC.
+ * @details Unlike the standard version, this function doesn't call any function
+ * registered with atexit before calling _exit.
+ */
+void __wrap_exit(int return_code) {
+    _exit(return_code);
+}
+
+/**
+ * @brief Retarget atexit from GCC.
+ * @details This function will always fail and never register any handler to be
+ * called at exit.
+ */
+int __wrap_atexit(void (*func)()) {
+    return 1;
+}
+
+}
+
+#endif
+
+
+
+namespace mbed {
+
+void mbed_set_unbuffered_stream(FILE *_file) {
+#if defined (__ICCARM__)
+    char buf[2];
+    std::setvbuf(_file,buf,_IONBF,NULL);    
+#else
+    setbuf(_file, NULL);
+#endif
+}
+
+int mbed_getc(FILE *_file){
+#if defined (__ICCARM__)
+    /*This is only valid for unbuffered streams*/
+    int res = std::fgetc(_file);
+    if (res>=0){
+        _file->_Mode = (unsigned short)(_file->_Mode & ~ 0x1000);/* Unset read mode */
+        _file->_Rend = _file->_Wend;
+        _file->_Next = _file->_Wend;
+    }    
+    return res;
+#else    
+    return std::fgetc(_file);
+#endif   
+}
+
+char* mbed_gets(char*s, int size, FILE *_file){
+#if defined (__ICCARM__)
+    /*This is only valid for unbuffered streams*/
+    char *str = fgets(s,size,_file);
+    if (str!=NULL){
+        _file->_Mode = (unsigned short)(_file->_Mode & ~ 0x1000);/* Unset read mode */
+        _file->_Rend = _file->_Wend;
+        _file->_Next = _file->_Wend;
+    }
+    return str;
+#else    
+    return std::fgets(s,size,_file);
+#endif
+}
+
+} // namespace mbed
+
+#if defined (__ICCARM__)
+// Stub out locks when an rtos is not present
+extern "C" WEAK void __iar_system_Mtxinit(__iar_Rmtx *mutex) {}
+extern "C" WEAK void __iar_system_Mtxdst(__iar_Rmtx *mutex) {}
+extern "C" WEAK void __iar_system_Mtxlock(__iar_Rmtx *mutex) {}
+extern "C" WEAK void __iar_system_Mtxunlock(__iar_Rmtx *mutex) {}
+extern "C" WEAK void __iar_file_Mtxinit(__iar_Rmtx *mutex) {}
+extern "C" WEAK void __iar_file_Mtxdst(__iar_Rmtx *mutex) {}
+extern "C" WEAK void __iar_file_Mtxlock(__iar_Rmtx *mutex) {}
+extern "C" WEAK void __iar_file_Mtxunlock(__iar_Rmtx *mutex) {}
+#elif defined(__CC_ARM)
+// Do nothing
+#elif defined (__GNUC__)
+struct _reent;
+// Stub out locks when an rtos is not present
+extern "C" WEAK void __rtos_malloc_lock( struct _reent *_r ) {}
+extern "C" WEAK void __rtos_malloc_unlock( struct _reent *_r ) {}
+extern "C" WEAK void __rtos_env_lock( struct _reent *_r ) {}
+extern "C" WEAK void __rtos_env_unlock( struct _reent *_r ) {}
+
+extern "C" void __malloc_lock( struct _reent *_r )
+{
+    __rtos_malloc_lock(_r);
+}
+
+extern "C" void __malloc_unlock( struct _reent *_r )
+{
+    __rtos_malloc_unlock(_r);
+}
+
+extern "C" void __env_lock( struct _reent *_r )
+{
+    __rtos_env_lock(_r);
+}
+
+extern "C" void __env_unlock( struct _reent *_r )
+{
+    __rtos_env_unlock(_r);
+}
+
+#define CXA_GUARD_INIT_DONE             (1 << 0)
+#define CXA_GUARD_INIT_IN_PROGRESS      (1 << 1)
+#define CXA_GUARD_MASK                  (CXA_GUARD_INIT_DONE | CXA_GUARD_INIT_IN_PROGRESS)
+
+extern "C" int __cxa_guard_acquire(int *guard_object_p)
+{
+    uint8_t *guard_object = (uint8_t *)guard_object_p;
+    if (CXA_GUARD_INIT_DONE == (*guard_object & CXA_GUARD_MASK)) {
+        return 0;
+    }
+    singleton_lock();
+    if (CXA_GUARD_INIT_DONE == (*guard_object & CXA_GUARD_MASK)) {
+        singleton_unlock();
+        return 0;
+    }
+    MBED_ASSERT(0 == (*guard_object & CXA_GUARD_MASK));
+    *guard_object = *guard_object | CXA_GUARD_INIT_IN_PROGRESS;
+    return 1;
+}
+
+extern "C" void __cxa_guard_release(int *guard_object_p)
+{
+    uint8_t *guard_object = (uint8_t *)guard_object_p;
+    MBED_ASSERT(CXA_GUARD_INIT_IN_PROGRESS == (*guard_object & CXA_GUARD_MASK));
+    *guard_object = (*guard_object & ~CXA_GUARD_MASK) | CXA_GUARD_INIT_DONE;
+    singleton_unlock();
+}
+
+extern "C" void __cxa_guard_abort(int *guard_object_p)
+{
+    uint8_t *guard_object = (uint8_t *)guard_object_p;
+    MBED_ASSERT(CXA_GUARD_INIT_IN_PROGRESS == (*guard_object & CXA_GUARD_MASK));
+    *guard_object = *guard_object & ~CXA_GUARD_INIT_IN_PROGRESS;
+    singleton_unlock();
+}
+
+#endif
+
+void *operator new(std::size_t count)
+{
+    void *buffer = malloc(count);
+    if (NULL == buffer) {
+        error("Operator new out of memory\r\n");
+    }
+    return buffer;
+}
+
+void *operator new[](std::size_t count)
+{
+    void *buffer = malloc(count);
+    if (NULL == buffer) {
+        error("Operator new[] out of memory\r\n");
+    }
+    return buffer;
+}
+
+void operator delete(void *ptr)
+{
+    if (ptr != NULL) {
+        free(ptr);
+    }
+}
+void operator delete[](void *ptr)
+{
+    if (ptr != NULL) {
+        free(ptr);
+    }
+}