General Purpose library for Freestanding C++ and POSIX systems
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#pragma once
#include "gp/containers/buffer.hpp"
#include <cstdint>
#define no_inline_decl(a) __attribute__((noinline)) a
namespace gp{
namespace system {
namespace specifics {
struct platform_data {
platform_data() = default;
platform_data(gp::buffer<char> stack_str)
: stack_ptr((stack_str.end()-16).data)
, base_ptr(stack_ptr)
{}
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))
{
volatile void* volatile tmp = static_cast<char*>(stack_ptr) - sizeof(void*);
*static_cast<volatile void* volatile * volatile>(tmp) = location;
__asm__ __volatile__(
"movq %1, %%rsp\n"
"movq %2, %%rbp\n"
"movq %3, %%rbx\n"
"movq %4, %%r12\n"
"movq %5, %%r13\n"
"movq %6, %%r14\n"
"movq %7, %%r15\n"
"popq %0\n"
: "+r"(location)
: "m"(tmp)
, "m"(base_ptr)
, "m"(rbx)
, "m"(r12)
, "m"(r13)
, "m"(r14)
, "m"(r15)
: "memory"
);
return location;
}
};
}
}
}