SLAU132V User guide | 德州仪器 TI.com.cn

SLAU132V October 2004 – February 2020

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6.3 Register Conventions

Strict conventions associate specific registers with specific operations in the C/C++ environment. If you plan to interface an assembly language routine to a C/C++ program, you must understand and follow these register conventions.

The register conventions dictate how the compiler uses registers and how values are preserved across function calls. Table 6-3 shows the types of registers affected by these conventions. Table 6-4 summarizes how the compiler uses registers and whether their values are preserved across calls. For information about how values are preserved across calls, see Section 6.4.

Table 6-3 How Register Types Are Affected by the Conventions

Register Type	Description
Argument register	Passes arguments during a function call
Return register	Holds the return value from a function call
Expression register	Holds a value
Argument pointer	Used as a base value from which a function's parameters (incoming arguments) are accessed
Stack pointer	Holds the address of the top of the software stack
Program counter	Contains the current address of code being executed

Table 6-4 Register Usage and Preservation Conventions

Register	Alias	Usage	Preserved by Function⁽¹⁾
R0	PC	Program counter	N/A
R1	SP	Stack pointer	N/A⁽²⁾
R2	SR	Status register	N/A
R3		Constant generator	N/A
R4-R10		Expression register	Child
R11		Expression register	Parent
R12		Expression register, argument pointer, return register	Parent
R13		Expression register, argument pointer, return register	Parent
R14		Expression register, argument pointer, return register	Parent
R15		Expression register, argument pointer, return register	Parent

(1) The parent function refers to the function making the function call. The child function refers to the function being called.

(2) The SP is preserved by the convention that everything pushed on the stack is popped off before returning.