RealView Compiler Reference Guide
Home Products Events Support	Search Keil.com for:

Technical Support

On-Line Manuals

RealView Compiler Reference Guide

Compiler Command-line Options

Language Extensions

Compiler-specific Features

Keywords and operators

__svc_indirect_r7

__value_in_regs

__declspec attributes

__declspec(dllexport)

__declspec(dllimport)

__declspec(noinline)

__declspec(noreturn)

__declspec(nothrow)

__declspec(notshared)

__declspec(thread)

Function attributes

__attribute__((alias))

__attribute__((always_inline))

__attribute__((const))

__attribute__((deprecated))

__attribute__((malloc))

__attribute__((noinline))

__attribute__((no_instrument_function))

__attribute__((nomerge))

__attribute__((nonnull))

__attribute__((noreturn))

__attribute__((notailcall))

__attribute__((pure))

__attribute__((section("name")))

__attribute__((unused))

__attribute__((used))

__attribute__((visibility("visibility_type")))

__attribute__((weak))

Type attributes

__attribute__((bitband))

__attribute__((aligned))

__attribute((packed))

__attribute__((transparent_union))

Variable attributes

__attribute__((alias))

__attribute__((at(address)))

__attribute__((aligned))

__attribute__((deprecated))

__attribute__((packed))

__attribute__((section("name")))

__attribute__((transparent_union))

__attribute__((unused))

__attribute__((used))

__attribute__((visibility("visibility_type")))

__attribute__((weak))

__attribute__((zero_init))

#pragma anon_unions, #pragma no_anon_unions

#pragma arm section [section_sort_list]

#pragma diag_default tag[,tag,...]

#pragma diag_error tag[,tag,...]

#pragma diag_remark tag[,tag,...]

#pragma diag_suppress tag[,tag,...]

#pragma diag_warning tag[, tag, ...]

#pragma exceptions_unwind, #pragma no_exceptions_u

#pragma hdrstop

#pragma import symbol_name

#pragma import(__use_full_stdio)

#pragma inline, #pragma no_inline

#pragma pack(n)

#pragma softfp_linkage, #pragma no_softfp_linkage

#pragma unroll [(n)]

#pragma unroll_completely

Instruction intrinsics

__memory_changed

__return_address

__schedule_barrier

ARMv6 SIMD intrinsics

ETSI basic operations

C55x intrinsics

Named register variables

VFP status intrinsic

GNU builtin functions

Nonstandard functions

C99 functions in the C90 reserved namespace

C99 floating-point functions

Other builtin functions

Compiler predefines

Predefined macros

C and C++ Implementation Details

Via File Syntax

Standard C Implementation Definition

Standard C++ Implementation Definition

C and C++ Compiler Implementation Limits

attribute((at(address)))

RealView Compilation Tools for µVision Compiler Reference Guide

Version 4.0

Home > Compiler-specific Features > Variable attributes > __attribute__((at(address)))

4.5.2. `attribute((at(address)))`

This variable attribute enables you to specify the absolute address of a variable.

The variable is placed in its own section, and the section containing the variable is given an appropriate type by the compiler:

Read-only variables are placed in a section with type RO.
Initialized read-write variables are placed in a section with type RW.
In particular, variables explicitly initialized to zero are placed in RW not ZI. Such variables are not candidates for the ZI-to-RW optimization of the compiler.
Uninitialized variables are placed in a section with type ZI.

Note

This variable attribute is not supported by GNU compilers.

Syntax

__attribute__((at(address)))

Where:

address: is the desired address of the variable.

Restrictions

The linker is not always able to place sections produced by the at variable attribute.

Errors

The linker gives an error message if it is not possible to place a section at a specified address.

Example

const int x1 __attribute__((at(0x10000))) = 10; /* RO */
int x2 __attribute__((at(0x12000))) = 10;       /* RW */
int x3 __attribute__((at(0x14000))) = 0;        /* RW, not ZI */
int x4 __attribute__((at(0x16000)));            /* ZI */

See also

Using __at sections to place sections at a specific address in the Linker User Guide.

Copyright © 2007, 2008 ARM Limited. All rights reserved.	ARM DUI 0376B
Non-Confidential	Unrestricted Access
PDF version

Home > Compiler-specific Features > Variable attributes > __attribute__((at(address)))