mpw/toolbox/stackframe.h
2013-02-15 00:00:15 -05:00

58 lines
1.0 KiB
C++

#ifndef __StackFrame_h__
#define __StackFrame_h__
#include <cstdint>
//
template<unsigned N>
void ToolReturn(uint32_t sp, uint32_t value)
{
static_assert(N == 2 || N == 4, "Invalid Return Size");
if (N == 4)
{
memoryWriteLong(value, sp);
}
if (N == 2)
{
memoryWriteWord(value, sp);
}
}
template<int Bytes, int Offset>
uint32_t StackFrame__(uint32_t sp)
{
static_assert(Offset == 0, "Invalid Stack Size");
cpuSetAReg(7, sp + Bytes);
return sp + Bytes;
}
template<int Bytes, int Offset, typename... Args>
uint32_t StackFrame__(uint32_t sp, uint32_t &x, Args&... args)
{
x = memoryReadLong(sp + Offset - 4);
return StackFrame__<Bytes, Offset - 4>(sp, args...);
}
template<int Bytes, int Offset, typename... Args>
uint32_t StackFrame__(uint32_t sp, uint16_t &x, Args&... args)
{
x = memoryReadWord(sp + Offset - 2);
return StackFrame__<Bytes, Offset - 2>(sp, args...);
}
template<int Bytes, typename... Args>
uint32_t StackFrame(Args&... args)
{
uint32_t sp = cpuGetAReg(7);
return StackFrame__<Bytes, Bytes>(sp, args...);
}
#endif