Question

I have a linker command file that assigns the top address of the stack into a variable

_stack = . + 0x80000;   

I want to use this address in a ‘c’ program – I want to copy the stack to another location and then update the stack pointer to point to the new location before doing a destructive memory test on the orginal bank of RAM.

I’m finding that if I do something like

extern u32 *_stack;   myFunction(_stack); 

Then the function seems to get passed the value stored at the stack location

lwz r3,0(r8) 

Rather than the address of the stack itself. Can anyone help?

Answer 1

Try

extern u32 _stack; U32 * stackPtr; stackPtr = &_stack;