8024344: PPC64 (part 112): C argument in register AND stack slot.
Summary: On PPC, the first 13 floating point arguments to C calls are passed in floating point registers. Also, all but the first 8 arguments are passed on the stack. So there can be floating point arguments that are passed on the stack and in a register. We duplicate the regs datastructure in c_calling_convention() to represent this.
Reviewed-by: kvn, cjplummer
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#ifndef CPU_ZERO_VM_STACK_ZERO_INLINE_HPP
#define CPU_ZERO_VM_STACK_ZERO_INLINE_HPP
#include "runtime/thread.hpp"
#include "stack_zero.hpp"
// This function should match SharkStack::CreateStackOverflowCheck
inline void ZeroStack::overflow_check(int required_words, TRAPS) {
// Check the Zero stack
if (available_words() < required_words) {
handle_overflow(THREAD);
return;
}
// Check the ABI stack
if (abi_stack_available(THREAD) < 0) {
handle_overflow(THREAD);
return;
}
}
// This method returns the amount of ABI stack available for us
// to use under normal circumstances. Note that the returned
// value can be negative.
inline int ZeroStack::abi_stack_available(Thread *thread) const {
int stack_used = thread->stack_base() - (address) &stack_used;
int stack_free = thread->stack_size() - stack_used;
return stack_free - shadow_pages_size();
}
#endif // CPU_ZERO_VM_STACK_ZERO_INLINE_HPP