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UM017105-0511 Calling Assembly Functions from C

Zilog Developer Studio II – ZNEO™

User Manual

175

Argument Locations

The assembly function assigns the location of the arguments following the C calling con-

ventions as described in the Calling Conventions

section on page 172. For example, if you

are using the following C prototype:

void myfunc(short arga, long argb, short *argc, char argd, int

arge, int argf, char argg, long *argh, int argi)

then the location of the arguments are:

arga: R1

argb: R2

argc: R3

argd: R4

arge: R5

argf: R6

argg: R7

The remaining arguments are on stack, and their offsets from Stack Pointer (SP, R15) at

the entry point of assembly function are:

argh: -4(SP)

argi: -8(SP)

The corresponding offsets from Frame Pointer (FP, R14) after a

Link #0 instruction are:

argh: -8(FP)

argi: -12(FP)

Return Values

The assembly function returns the value in the location as specified by the C calling con-

vention as described in Calling Conventions

on page 172.

For example, if you are using the following C prototype:

long myfunc(short arga, long argb, short *argc)

then the assembly function returns the long value in register R0.

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