Zilog Z80380 Manual do Utilizador descarregar pdf (Página 66)

Function Calls Run Time Environment

4–2 UM004001-COR1103

FIGURE 4-1. FRAME LAYOUT

RESPONSIBILITIES OF A CALLED FUNCTION

A called function must perform the following tasks.

1. Push the frame pointer (IX) onto the stack.

2. Allocate the local frame.

3. Execute the code for the function.

4. If the function returns a scalar value it is placed in the accumulator (HL register for scalars

greater than eight bits and the

A register for eight-bit scalars).

5. Deallocate the local frame.

6. Restore the caller’s frame pointer.

7. Return.

ParameterN

Parameter 1

Parameter 0

Return address

Caller’s frame pointer (IX)

Locals

Temporaries

Low Address

Stack Pointer

Frame Pointer

Run Time Stack

High Address

1 2 ... 61 62 63 64 65 66 67 68 69 70 71 ... 115 116

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