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Libraries and Floating Point Support Guide
Preface
The ARM C and C++ Libraries
The ARM C Micro-library
Floating-point Support
The C and C++ Library Functions reference
Floating-point Support Functions Reference
ARM Compiler v5.06 for µVision ARM C and C++ Libraries and Floating-Point Support User Guide
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ARM® Compiler v5.06 for µVision® ARM C and C++ Libraries and Floating-Point Support User Guide
Version 5
Copyright © 2007, 2008, 2011, 2012, 2014-2016 ARM. All rights reserved.
Table of Contents
- Preface
- 1 The ARM C and C++ Libraries
- 1.1 Mandatory linkage with the C library
- 1.2 C and C++ runtime libraries
- 1.2.1 Summary of the C and C++ runtime libraries
- 1.2.2 Compliance with the Application Binary Interface (ABI) for the ARM architecture
- 1.2.3 Increasing portability of object files to other CLIBABI implementations
- 1.2.4 ARM C and C++ library directory structure
- 1.2.5 Selection of ARM® C and C++ library variants based on build options
- 1.2.6 Thumb C libraries
- 1.3 C and C++ library features
- 1.4 C++ and C libraries and the std namespace
- 1.5 Multithreaded support in ARM C libraries
- 1.5.1 ARM C libraries and multithreading
- 1.5.2 ARM C libraries and reentrant functions
- 1.5.3 ARM C libraries and thread-safe functions
- 1.5.4 Use of static data in the C libraries
- 1.5.5 Use of the __user_libspace static data area by the C libraries
- 1.5.6 C library functions to access subsections of the __user_libspace static data area
- 1.5.7 Re-implementation of legacy function __user_libspace() in the C library
- 1.5.8 Management of locks in multithreaded applications
- 1.5.9 How to ensure re-implemented mutex functions are called
- 1.5.10 Using the ARM C library in a multithreaded environment
- 1.5.11 Thread safety in the ARM C library
- 1.5.12 Thread safety in the ARM C++ library
- 1.5.13 The floating-point status word in a multithreaded environment
- 1.6 Support for building an application with the C library
- 1.6.1 Using the C library with an application
- 1.6.2 Using the C and C++ libraries with an application in a semihosting environment
- 1.6.3 Using $Sub$$ to mix semihosted and nonsemihosted I/O functionality
- 1.6.4 Using the libraries in a nonsemihosting environment
- 1.6.5 C++ exceptions in a non-semihosting environment
- 1.6.6 Direct semihosting C library function dependencies
- 1.6.7 Indirect semihosting C library function dependencies
- 1.6.8 C library API definitions for targeting a different environment
- 1.7 Support for building an application without the C library
- 1.7.1 Building an application without the C library
- 1.7.2 Creating an application as bare machine C without the C library
- 1.7.3 Integer and floating-point compiler functions and building an application without the C library
- 1.7.4 Bare machine integer C
- 1.7.5 Bare machine C with floating-point processing
- 1.7.6 Customized C library startup code and access to C library functions
- 1.7.7 Using low-level functions when exploiting the C library
- 1.7.8 Using high-level functions when exploiting the C library
- 1.7.9 Using malloc() when exploiting the C library
- 1.8 Tailoring the C library to a new execution environment
- 1.9 Assembler macros that tailor locale functions in the C library
- 1.9.1 Link time selection of the locale subsystem in the C library
- 1.9.2 Runtime selection of the locale subsystem in the C library
- 1.9.3 Definition of locale data blocks in the C library
- 1.9.4 LC_CTYPE data block
- 1.9.5 LC_COLLATE data block
- 1.9.6 LC_MONETARY data block
- 1.9.7 LC_NUMERIC data block
- 1.9.8 LC_TIME data block
- 1.10 Modification of C library functions for error signaling, error handling, and program exit
- 1.11 Stack and heap memory allocation and the ARM C and C++ libraries
- 1.11.1 Library heap usage requirements of the ARM C and C++ libraries
- 1.11.2 Choosing a heap implementation for memory allocation functions
- 1.11.3 Stack pointer initialization and heap bounds
- 1.11.4 Legacy support for __user_initial_stackheap()
- 1.11.5 Avoiding the heap and heap-using library functions supplied by ARM
- 1.12 Tailoring input/output functions in the C and C++ libraries
- 1.13 Target dependencies on low-level functions in the C and C++ libraries
- 1.14 The C library printf family of functions
- 1.15 The C library scanf family of functions
- 1.16 Redefining low-level library functions to enable direct use of high-level library functions in the C library
- 1.17 The C library functions fread(), fgets() and gets()
- 1.18 Re-implementing __backspace() in the C library
- 1.19 Re-implementing __backspacewc() in the C library
- 1.20 Redefining target-dependent system I/O functions in the C library
- 1.21 Tailoring non-input/output C library functions
- 1.22 Real-time integer division in the ARM libraries
- 1.23 ISO C library implementation definition
- 1.23.1 How the ARM C library fulfills ISO C specification requirements
- 1.23.2 mathlib error handling
- 1.23.3 ISO-compliant implementation of signals supported by the signal() function in the C library and additional type arguments
- 1.23.4 ISO-compliant C library input/output characteristics
- 1.23.5 Standard C++ library implementation definition
- 1.24 C library functions and extensions
- 1.25 Compiler generated and library-resident helper functions
- 1.26 C and C++ library naming conventions
- 1.27 Using macro__ARM_WCHAR_NO_IO to disable FILE declaration and wide I/O function prototypes
- 1.28 Using library functions with execute-only memory
- 2 The ARM C Micro-library
- 2.1 About microlib
- 2.2 Differences between microlib and the default C library
- 2.3 Library heap usage requirements of microlib
- 2.4 ISO C features missing from microlib
- 2.5 Building an application with microlib
- 2.6 Configuring the stack and heap for use with microlib
- 2.7 Entering and exiting programs linked with microlib
- 2.8 Tailoring the microlib input/output functions
- 3 Floating-point Support
- 3.1 About floating-point support
- 3.2 The software floating-point library, fplib
- 3.3 Controlling the ARM floating-point environment
- 3.3.1 Floating-point functions for compatibility with Microsoft products
- 3.3.2 C99-compatible functions for controlling the ARM floating-point environment
- 3.3.3 C99 rounding mode and floating-point exception macros
- 3.3.4 Exception flag handling
- 3.3.5 Functions for handling rounding modes
- 3.3.6 Functions for saving and restoring the whole floating-point environment
- 3.3.7 Functions for temporarily disabling exceptions
- 3.3.8 ARM floating-point compiler extensions to the C99 interface
- 3.3.9 Writing a custom exception trap handler
- 3.3.10 Example of a custom exception handler
- 3.3.11 Exception trap handling by signals
- 3.4 mathlib double and single-precision floating-point functions
- 3.5 IEEE 754 arithmetic
- 3.5.1 Basic data types for IEEE 754 arithmetic
- 3.5.2 Single precision data type for IEEE 754 arithmetic
- 3.5.3 Double precision data type for IEEE 754 arithmetic
- 3.5.4 Sample single precision floating-point values for IEEE 754 arithmetic
- 3.5.5 Sample double precision floating-point values for IEEE 754 arithmetic
- 3.5.6 IEEE 754 arithmetic and rounding
- 3.5.7 Exceptions arising from IEEE 754 floating-point arithmetic
- 3.5.8 Exception types recognized by the ARM floating-point environment
- 3.6 Using the Vector Floating-Point (VFP) support libraries
- 4 The C and C++ Library Functions reference
- 4.1 __aeabi_errno_addr()
- 4.2 alloca()
- 4.3 clock()
- 4.4 _clock_init()
- 4.5 __default_signal_handler()
- 4.6 errno
- 4.7 _findlocale()
- 4.8 _fisatty()
- 4.9 _get_lconv()
- 4.10 getenv()
- 4.11 _getenv_init()
- 4.12 __heapstats()
- 4.13 __heapvalid()
- 4.14 lconv structure
- 4.15 localeconv()
- 4.16 _membitcpybl(), _membitcpybb(), _membitcpyhl(), _membitcpyhb(), _membitcpywl(), _membitcpywb(), _membitmovebl(), _membitmovebb(), _membitmovehl(), _membitmovehb(), _membitmovewl(), _membitmovewb()
- 4.17 posix_memalign()
- 4.18 #pragma import(_main_redirection)
- 4.19 __raise()
- 4.20 _rand_r()
- 4.21 remove()
- 4.22 rename()
- 4.23 __rt_entry
- 4.24 __rt_errno_addr()
- 4.25 __rt_exit()
- 4.26 __rt_fp_status_addr()
- 4.27 __rt_heap_extend()
- 4.28 __rt_lib_init()
- 4.29 __rt_lib_shutdown()
- 4.30 __rt_raise()
- 4.31 __rt_stackheap_init()
- 4.32 setlocale()
- 4.33 _srand_r()
- 4.34 strcasecmp()
- 4.35 strncasecmp()
- 4.36 strlcat()
- 4.37 strlcpy()
- 4.38 _sys_close()
- 4.39 _sys_command_string()
- 4.40 _sys_ensure()
- 4.41 _sys_exit()
- 4.42 _sys_flen()
- 4.43 _sys_istty()
- 4.44 _sys_open()
- 4.45 _sys_read()
- 4.46 _sys_seek()
- 4.47 _sys_tmpnam()
- 4.48 _sys_write()
- 4.49 system()
- 4.50 time()
- 4.51 _ttywrch()
- 4.52 __user_heap_extend()
- 4.53 __user_heap_extent()
- 4.54 __user_setup_stackheap()
- 4.55 __vectab_stack_and_reset
- 4.56 wcscasecmp()
- 4.57 wcsncasecmp()
- 4.58 wcstombs()
- 4.59 Thread-safe C library functions
- 4.60 C library functions that are not thread-safe
- 4.61 Legacy function __user_initial_stackheap()
- 5 Floating-point Support Functions Reference
List of Figures
List of Tables
- 1-1 C library callouts
- 1-2 Direct semihosting dependencies
- 1-3 Indirect semihosting dependencies
- 1-4 Published API definitions
- 1-5 Standalone C library functions
- 1-6 Default ISO8859-1 locales
- 1-7 Default Shift-JIS and UTF-8 locales
- 1-8 Trap and error handling
- 1-9 Input/output dependencies
- 1-10 Signals supported by the signal() function
- 1-11 perror() messages
- 1-12 Standard C++ library differences
- 1-13 C library extensions
- 3-1 Arithmetic routines
- 3-2 Number format conversion routines
- 3-3 Floating-point comparison routines
- 3-4 fplib C99 functions
- 3-5 FE_EX_INTYPE_MASK operand type flags
- 3-6 FE_EX_OUTTYPE_MASK operand type flags
- 3-7 FE_EX_FN_MASK operation type flags
- 3-8 FE_EX_CMPRET_MASK comparison type flags
- 3-9 Sample single-precision floating-point values
- 3-10 Sample double-precision floating-point values
- 4-1 Functions that are thread-safe
- 4-2 Functions that are not thread-safe
- 5-1 _controlfp argument macros
- 5-2 Status word bit modification
- 5-3 Rounding mode control
Release Information
| Document History | |||
|---|---|---|---|
| Issue | Date | Confidentiality | Change |
| A | May 2007 | Non-Confidential | Release for RVCT v3.1 Release for µVision |
| B | December 2008 | Non-Confidential | Release for RVCT v4.0 for µVision |
| C | June 2011 | Non-Confidential | Release for ARM Compiler v4.1 for µVision |
| D | July 2012 | Non-Confidential | Release for ARM Compiler v5.02 for µVision |
| E | 30 May 2014 | Non-Confidential | Release for ARM Compiler v5.04 for µVision |
| F | 12 December 2014 | Non-Confidential | Release for ARM Compiler v5.05 for µVision |
| G | 15 August 2015 | Non-Confidential | Release for ARM Compiler v5.06 for µVision |
| H | 17 June 2016 | Non-Confidential | Release for ARM Compiler v5.06 update 3 for µVision |
Non-Confidential Proprietary Notice
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Additional Notices
Some material in this document is based on IEEE 754-1985 IEEE Standard for Binary Floating-Point Arithmetic. The IEEE disclaims any responsibility or liability resulting from the placement and use in the described manner.
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| Non-Confidential | PDF version | ARM DUI0378H |
| Copyright © 2007, 2008, 2011, 2012, 2014-2016 ARM. All rights reserved. |
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