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CARM User's Guide
CARM Introduction Compiling Programs Language Extensions Preprocessor Advanced Programming Customization Files
Startup Code Basic I/O Memory Allocation Interfacing C to Assembler Function Parameters Function Return Values Using the SRC Directive Register Usage Example Routines ARM Code Example Thumb Code Example Data Storage Formats Byte Order Byte Alignment Integer Scalars 1-Byte Scalars 2-Byte Scalars 4-Byte Scalars 8-Byte Scalars float Scalars float Format float Errors double Scalars double Format double Errors Pointers Bit Fields Absolute Memory Access The __at Keyword Linker Location Controls Error Messages Library Reference AppendixThe __at Keyword
The __at keyword allows you to specify the address for variables in your C source files. The following example demonstrates how to locate variable types using the __at keyword.
struct link {
struct link idata *next;
char code *test;
};
struct link list __at 0x00014000; // list at 0x00014000
int const MyVal __at 0x81000000 = 0x123; // MyVal at 0x81000000 with initialization
Refer to Absolute Variable Location for more information about the _at_ keyword.
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