ARM Compiler toolchain v4.1 for µVision Using the Compiler

Using the Inline and Embedded Assemblers of the ARM Compiler
7.25 Behavior of BL and SVC without optional lists in C and C++ code
The BL and SVC instructions of the inline assembler have the following format:
SVC{cond} svc_num, {input_param_list}, {output_value_list}, {corrupt_reg_list}
BL{cond} function, {input_param_list}, {output_value_list}, {corrupt_reg_list}
If you do not specify any lists, then:
• r0-r3 are used as input parameters
• r0 is used for the output value and can be corrupted
• r0-r3, r14, and the PSR can be corrupted.
7.25.1 See also
Concepts
• Inline assembler function calls and branches in C and C++ code on page 7-29
• Compiler support for inline assembly language on page 7-4.
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