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RealView Libraries and Floating Point Support Guide
Preface Introduction About the runtime libraries
ABI for the ARM Architecture compliance Library directory structure Build options and library variants Thumb C libraries About floating‑point support The C and C++ Libraries The C Micro-library Floating‑point SupportThumb C libraries
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The linker automatically links in the Thumb C library if it detects that one or more of the objects to be linked have been built for:
Thumb or Thumb-2, either using the
‑‑thumboption or#pragma thumbinterworking, using the
‑‑apcs /interworkoption on architecture ARMv4Tan ARM v6-M architecture target or processor, for example, Cortex-M1
an ARMv7‑M architecture target or processor, for example, Cortex‑M3.
Despite its name, the Thumb C library might not contain exclusively Thumb code, but might use ARM instructions if they are available for critical functions, such as memcpy, memset, and memclr, for good performance. The bulk of the Thumb C library, however, is coded in Thumb for the best code density.
Note
The Thumb C library used for ARMv6-M targets contains only Thumb-1 code.
The Thumb C library used for ARMv7‑M targets contains only Thumb‑2 code.
See Chapter 2 The C and C++ Libraries for more information.
| Copyright © 2007 ARM Limited. All rights reserved. | ARM DUI 0378A |
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