gplib/include/gp/vfs/platforms/gcc-x86_64.hpp

#pragma once

#include <cstdint>

#define no_inline_decl(a) [[gnu::noinline]] a

namespace gp{
	namespace specifics {
		struct platform_data {
			uint64_t rbx, r12, r13, r14, r15;

			void* stack_ptr;
			void* base_ptr;

			void pull() __attribute__((always_inline))
			{
				__asm__ __volatile__(
				"movq %%rsp, %0\n"
				"movq %%rbp, %1\n" 
				"movq %%rbx, %2\n" 
				"movq %%r12, %3\n" 
				"movq %%r13, %4\n" 
				"movq %%r14, %5\n" 
				"movq %%r15, %6\n" 
				: "=m"(stack_ptr)
				, "=m"(base_ptr)
				, "=m"(rbx)
				, "=m"(r12)
				, "=m"(r13)
				, "=m"(r14)
				, "=m"(r15));
			}

			void* push(void* location)  __attribute__((always_inline))
			{
				void* tmp = static_cast<char*>(stack_ptr) - sizeof(void*);
				*static_cast<void**>(tmp) = location;
				__asm__ __volatile__(
				"movq %1, %%rsp\n"
				"movq %2, %%rbp\n"
				"movq %3, %%r12\n"
				"movq %4, %%r13\n"
				"movq %5, %%r14\n"
				"movq %6, %%r15\n"
				"popq %0\n" 
				: "+r"(location) 
				: "m"(tmp)
				, "m"(base_ptr) 
				, "m"(r12) 
				, "m"(r13) 
				, "m"(r14) 
				, "m"(r15) 
				: "memory");
				return location;
			}
		};
	}
}