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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 AppendixPointers
Pointer scalars are stored using four bytes (32 bits) in little endian (default) or big endian (if the BIGENDIAN compiler directive is specified).
Little Endian (default)
When configured for little endian, the low-order byte is stored first, followed by the high-order byte. For example, an integer value of 0x12345678 is stored in memory as follows:
| Address Offset | +0 | +1 | +2 | +3 |
|---|---|---|---|---|
| Contents | 0x78 | 0x56 | 0x34 | 0x12 |
Big Endian
When configured for big endian, the high-order byte is stored first, followed by the low-order byte. For example, an integer value of 0x12345678 is stored in memory as follows:
| Address Offset | +0 | +1 | +2 | +3 |
|---|---|---|---|---|
| Contents | 0x12 | 0x34 | 0x56 | 0x78 |
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