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RealView Libraries and Floating Point Support Guide
Preface Introduction The C and C++ Libraries About the C and C++ libraries
Features of the C and C++ libraries Namespaces Writing reentrant and thread‑safe code Introduction to reentrancy and thread‑safety Use of static data in the C libraries The __user_libspace static data area Managing locks in multithreaded applications Using the ARM C libraries with a multithreaded app Thread‑safety in the ARM C libraries Thread‑safety in the ARM C++ libraries Building an application with the C library Using the libraries with an application Building an application for a semihosted environme Building an application for a non semihosting envi Building an application without the C library Integer and FP helper functions Bare machine integer C Bare machine C with floating‑point Exploiting the C library The standalone C library functions Tailoring the C library to a new execution environ How C and C++ programs use the library functions __rt_entry Exiting from the program __rt_exit() __rt_lib_init() __rt_lib_shutdown() Tailoring static data access Tailoring locale and CTYPE using assembler macros Selecting locale at link time Selecting locale at runtime Defining a locale block LC_CTYPE data block LC_COLLATE data block LC_MONETARY data block LC_NUMERIC data block LC_TIME data block _get_lconv() localeconv() setlocale() _findlocale() The lconv structure Tailoring locale and CTYPE using C macros Selecting locale at link time Selecting locale at runtime Macros and utility functions _get_lc_ctype() _get_lc_collate() _get_lc_monetary() _get_lc_numeric() _get_lc_time() _get_lconv() localeconv() setlocale() _findlocale() __LC_CTYPE_DEF __LC_COLLATE_DEF __LC_TIME_DEF __LC_NUMERIC_DEF __LC_MONETARY_DEF __LC_INDEX_END The lconv structure Tailoring error signaling, error handling, and pro _sys_exit() errno __rt_errno_addr() __raise() __rt_raise() __default_signal_handler() _ttywrch() __rt_fp_status_addr() Tailoring storage management Avoiding the ARM‑supplied heap and heap‑using Support for malloc Tailoring the runtime memory model The memory models Controlling the runtime memory model Writing your own memory model __user_initial_stackheap() __user_setup_stackheap() __user_heap_extend() __user_heap_extent() __user_stack_cleanup_space() __rt_heap_extend() __rt_stack_postlongjmp() Tailoring the input/output functions Dependencies on low‑level functions Target‑dependent input/output support functions _sys_open() _sys_close() _sys_read() _sys_write() _sys_ensure() _sys_flen() _sys_seek() _sys_istty() _sys_tmpnam() _sys_command_string() #pragma import(_main_redirection) Tailoring other C library functions clock() _clock_init() time() remove() rename() system() getenv() _getenv_init() Selecting real‑time division ISO implementation definition ISO C library implementation definition Standard C++ library implementation definition C library extensions atoll() strtoll() strtoull() printf() snprintf() vsnprintf() lldiv() llabs() wcstombs() alloca() strlcpy() strlcat() _fisatty() __heapstats() __heapvalid() Library naming conventions Placing ARM libraries Helper libraries Identifying library variants The C Micro-library Floating‑point SupportTailoring error signaling, error handling, and program exit
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All trap or error signals raised by the C library go through the __raise() function. You can re‑implement this function or the lower‑level functions that it uses.
Caution
The IEEE 754 standard for floating‑point processing states that the default response to an exception is to proceed without a trap. You can modify floating‑point error handling by tailoring the functions and definitions in fenv.h. See also Chapter 4 Floating‑point Support.
See the rt_misc.h include file for more information on error‑related functions.
The trap and error‑handling functions are shown in Table 2.10. See also Tailoring the C library to a new execution environment for additional information about application initialization and shutdown.
Table 2.10. Trap and error handling
| Function | Description |
|---|---|
_sys_exit() | Called, eventually, by all exits from the library. See _sys_exit(). |
errno | Is a static variable used with error handling. See errno. |
__rt_errno_addr() | This function is called to obtain the address of the variable errno. See __rt_errno_addr(). |
__raise() | Raises a signal to indicate a runtime anomaly. See __raise(). |
__rt_raise() | Raises a signal to indicate a runtime anomaly. See __rt_raise(). |
__default_signal_handler() | Displays an error indication to the user. See __default_signal_handler(). |
_ttywrch() | Writes a character to the console. The default implementation of _ttywrch() is semihosted and, therefore, uses semihosting calls. See _ttywrch(). |
__rt_fp_status_addr() | This function is called to obtain the address of the fp status word. See __rt_fp_status_addr(). |
| Copyright © 2007 ARM Limited. All rights reserved. | ARM DUI 0378A |
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