Is the stack layout for an arch standard?

I was studying the dump_stack function in linux kernel (form arm) and I came across struct stackframe { /* * FP member should hold R7 when CONFIG_THUMB2_KERNEL is enabled * and R11 otherwise. */ unsigned long fp; unsigned long sp; unsigned long lr; unsigned long pc; }; If this is the complete stack frame, then where are the local variables stored? Is this format generic, for example will U-Boot compiled for the same arch use this exact format for maintaining stack? -Abhimanyu