Thread: Creating push & pop functions... decrementing/tracking?

Originally Posted by lolguy

i Thought push is assembly ?

It is, that's why I need to create a push & pop function by hand since I'm working in C

Originally Posted by lolguy

i Thought push is assembly ?

It is called push in most assembly languages, but you are using C.
I don't think C has a 'push' as far as I am aware.

when you using asm with c you do __asm{
or can you use push directly with it ?

Originally Posted by lolguy

when you using asm with c you do __asm{
or can you use push directly with it ?

The odds that we actually want to push on the system stack is very very very very very small. We want our own stack.

Z80 assembler stack operations.
Unfortunately it is abit more complicated as the registers are paired
so you push two 8 bit ints to store two paired 8 bit registers.
Also it is 'upside down' the 'top' of the stack is high and as you push stuff
onto it it is stored at lower memory locations.

Code:

PUSH 	B 	PUSH 	BC 	C5 	(SP-2) <- C; (SP-1) <- B; SP <- SP - 2
PUSH 	D 	PUSH 	DE 	D5 	(SP-2) <- E; (SP-1) <- D; SP <- SP - 2
PUSH 	H 	PUSH 	HL 	E5 	(SP-2) <- L; (SP-1) <- H; SP <- SP - 2
PUSH 	PSW 	PUSH 	AF 	F5 	(SP-2) <- Flags; (SP-1) <- A; SP <- SP - 2
---		PUSH 	IX 	DDE5 	(SP-2) <- IXl; (SP-1) <- IXh; SP <- SP - 2
---		PUSH 	IY 	FDE5 	(SP-2) <- IYl; (SP-1) <- IYh; SP <- SP - 2
POP 	B 	POP 	BC 	C1 	B <- (SP+1); C <- (SP); SP <- SP + 2
POP 	D 	POP 	DE 	D1 	D <- (SP+1); E <- (SP); SP <- SP + 2
POP 	H 	POP 	HL 	E1 	H <- (SP+1); L <- (SP); SP <- SP + 2
POP 	PSW 	POP 	AF 	F1 	A <- (SP+1); Flags <- (SP); SP <- SP + 2

It is, but it's been part of C since Turbo C/C++ 1.01, that I know of.

Originally Posted by lolguy

i Thought push is assembly ?

It is, except that here we are using terms that are similar thing only implementing them with C.

Originally Posted by lolguy

i Thought push is assembly ?

Yes you can call it what ever you like, call it shove(x) if you like and then pull(x), it's just
an arbitary name of a function.