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The ARM C and C++ libraries
Mandatory linkage with the C library
C and C++ runtime libraries
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Library heap usage requirements of the ARM C and C
Compliance with the Application Binary Interface (
Increasing portability of object files to other CL
ARM C and C++ library directory structure
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ARM C libraries and multithreading
ARM C libraries and reentrant functions
ARM C libraries and thread-safe functions
Use of static data in the C libraries
Use of the __user_libspace static data area by the
C library functions to access subsections of the _
Re-implementation of legacy function __user_libspa
Management of locks in multithreaded applications
How to ensure re-implemented mutex functions are c
Using the ARM C library in a multithreaded environ
Thread safety in the ARM C library
Thread safety in the ARM C++ library
The floating-point status word in a multithreaded
Using the C library with an application
Using the C and C++ libraries with an application
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Using high-level functions when exploiting the C l
Using malloc() when exploiting the C library
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How C and C++ programs use the library functions
Initialization of the execution environment and ex
C++ initialization, construction and destruction
Legacy support for C$$pi_ctorvec instead of .init_
Exceptions system initialization
Emergency buffer memory for exceptions
Library functions called from main()
Program exit and the assert macro
Assembler macros that tailor locale functions in t
Link time selection of the locale subsystem in the
ISO8859-1 implementation
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Definition of locale data blocks in the C library
LC_CTYPE data block
LC_COLLATE data block
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Modification of C library functions for error sign
Modification of memory management functions in the
Avoiding the heap and heap-using library functions
C library support for memory allocation functions
Heap1, standard heap implementation
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Stack pointer initialization and heap bounds
Defining __initial_sp, __heap_base and __heap_limi
Extending heap size at runtime
Legacy support for __user_initial_stackheap()
Tailoring input/output functions in the C and C++
Target dependencies on low-level functions in the
The C library printf family of functions
The C library scanf family of functions
Redefining low-level library functions to enable d
The C library functions fread(), fgets() and gets(
Re-implementing __backspace() in the C library
Re-implementing __backspacewc() in the C library
Redefining target-dependent system I/O functions i
Tailoring non-input/output C library functions
Real-time integer division in the ARM libraries
Selecting real-time division in the ARM libraries
How the ARM C library fulfills ISO C specification
mathlib error handling
ISO-compliant implementation of signals supported
ISO-compliant C library input/output characteristi
Standard C++ library implementation definition
C library functions and extensions
Persistence of C and C++ library names across rele
Link time selection of C and C++ libraries
Managing projects that have explicit C or C++ libr
Compiler generated and library-resident helper fun
C and C++ library naming conventions
Using macro__ARM_WCHAR_NO_IO to disable FILE decla
The ARM C micro-library
Floating-point support
Libraries and Floating Point Support Guide
Legacy support for __user_initial_stackheap()
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| Home > The ARM C and C++ libraries > Legacy support for __user_initial_stackheap() | |||
Defined in rt_misc.h, __user_initial_stackheap() is
supported for backwards compatibility with earlier versions of the
ARM C and C++ libraries.
Note
ARM recommends that you use __user_setup_stackheap() in
preference to __user_initial_stackheap().
The differences between __user_initial_stackheap() and __user_setup_stackheap() are:
__user_initial_stackheap()receives the stack pointer (containing the same value it had on entry to__main()) inr1, and is expected to return the new stack base inr1.__user_setup_stackheap()receives the stack pointer insp, and returns the stack base insp.__user_initial_stackheap()is provided with a small temporary stack to run on. This temporary stack enables__user_initial_stackheap()to be implemented in C, providing that it uses no more than 88 bytes of stack space.__user_setup_stackheap()has no temporary stack and cannot usually be implemented in C.
Using __user_setup_stackheap() instead
of __user_initial_steakheap() reduces code
size, because __user_setup_stackheap() has
no requirement for a temporary stack.
In the following circumstances you cannot use the provided __user_setup_stackheap() function, but
you can use the __user_initial_stackheap() function:
your implementation is sufficiently complex that it warrants the use of a temporary stack when setting up the initial heap and stack
you have a requirement to implement the heap and stack creation code in C rather than in assembly language.
See also- Reference
ARM C and C++ Libraries and Floating-Point Support Reference:
| Copyright © 2007-2008, 2011-2012 ARM. All rights reserved. | ARM DUI 0378D |
| Non-Confidential | ID062912 |
 PDF version | |
| Home > The ARM C and C++ libraries > Legacy support for __user_initial_stackheap() |
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