Hi,
I need to switch the stack before a function call in C++. Can I just
change the stack pointer just before the function invocation. Is that
all that is required to change stacks? Like,
void func {
change_stack_pointer
foo (exp1, exp2...)
restore_stack_pointer
}
The function call has expressions that access the local variable in
the original stack. I am concerned that if a compiler (say g++)
emits a code that accesses the local variable of func using address
relative to SP, then the above approach will fail (because the SP is
changed). How shall I gurantee in g++ (and if possible in other
compilers) that access to local variables is not relative to SP? Or is
it always the case that the access is not relative to SP?
I know that there are other ways to change stack (makecontext,
sigaltstack etc). But, I want an extremely light weight mechanism.
--Ganesh
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