Thumb_to_ARM
所属分类：处理器开发
开发工具：C/C++
文件大小：25KB
下载次数：6
上传日期：2009-08-12 17:41:27
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说明： ARM 状态到 Thumb切换的例程，为了增强系统的灵活性以及提高系统的整体性能经常需要使用16位的Thumb指令,所以需要在ARM和Thumb状态之间来切换。
(ARM state to Thumb switch routine, in order to enhance the flexibility of the system and to improve the overall performance of the system often need to use 16-bit Thumb instructions, there is a need in the ARM and Thumb state to switch between.)
文件列表:
armtothumb.bat (153, 2002-07-15)
Thumb_to_ARM.mcp (381860, 2002-07-15)
thumbmain.c (201, 2002-07-15)
thumbsub.c (102, 2002-07-15)
thumbtoarm.bat (153, 2002-07-15)
ARM_to_Thumb.mcp (381860, 2002-07-15)
armmain.c (201, 2002-07-15)
armsub.c (98, 2002-07-15)
interwork
=========
This directory contains two simple projects to illustrate ARM/Thumb interworking
with C code. CodeWarrior project files and script (batch) files are provided.
For details, see the Developer Guide, Chapter 3, "Interworking ARM and Thumb".
The two projects show:
1. An ARM main() calling a Thumb subroutine
2. A Thumb main() calling an ARM subroutine
In both cases, the linker pulls in the appropriate C library, and adds interworking
veneers. The added veneers are shown with the linker '-info veneers' option.
1. ARM (main) code calling a Thumb subroutine
The two files in this project are armmain.c and thumbsub.c.
Use the CodeWarrior project file ARM_to_Thumb.mcp to build the project.
Alternatively execute the command-line script armtothumb.bat.
armcc -c -g -O1 -apcs /interwork armmain.c
tcc -c -g -O1 -apcs /interwork thumbsub.c
armlink armmain.o thumbsub.o -o armtothumb.axf -info veneers
2. Thumb (main) code calling an ARM subroutine
The two files in this project are thumbain.c and armsub.c.
Use the CodeWarrior project file Thumb_to_ARM.mcp to build the project.
Alternatively execute the command-line script thumbtoarm.bat:
tcc -c -g -O1 -apcs /interwork thumbmain.c
armcc -c -g -O1 -apcs /interwork armsub.c
armlink thumbmain.o armsub.o -o thumbtoarm.axf -info veneers
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