William "Chops" Westfield wrote:

> On Jun 23, 2011, at 8:29 PM, Harold Hallikainen wrote:
>=20
>> Is it possible to read the current stack pointer in C? If so, what
>> would the instruction be?
>=20
> Exactly or approximately?
>=20
> void *returnsp()
> {
>    int a;
>    return &a;
> }
>=20
> Should be pretty close (on almost any processor that uses stack frames
> for local variables.)

That's probably close, but at the caller's location almost certainly off
by an int, possibly by an int and a return address and possibly some
stack frame overhead (if the function didn't get inlined).=20

> Otherwise you get to look at inline assembler and/or assembler =20
> subroutines.

And the compiler docs and generated code for how the compiler uses the
stack.=20

Gerhard
--=20
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