General Purpose library for Freestanding C++ and POSIX systems
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#pragma once
#include <cstdint>
#include <cstddef>
#include <gp/containers/buffer.hpp>
#if defined(__x86_64__)
#if defined(__linux__)
constexpr bool is_x86_64_linux = true;
#else
constexpr bool is_x86_64_linux = false;
#endif
#else
constexpr bool is_x86_64_linux = false;
#endif
template<int64_t syscall_id, int arg_count>
struct syscall;
template<int64_t syscall_id>
requires is_x86_64_linux
struct syscall<syscall_id, 1> {
int64_t operator()(int64_t p1) const {
int64_t ret;
asm volatile
(
"syscall"
: "=a" (ret)
: "0"(syscall_id), "D"(p1)
: "rcx", "r11", "memory"
);
return ret;
}
};
template<int64_t syscall_id>
requires is_x86_64_linux
struct syscall<syscall_id, 2> {
int64_t operator()(int64_t p1,int64_t p2) const {
int64_t ret;
asm volatile
(
"syscall"
: "=a" (ret)
: "0"(syscall_id), "D"(p1), "S"(p2)
: "rcx", "r11", "memory"
);
return ret;
}
};
template<int64_t syscall_id>
requires is_x86_64_linux
struct syscall<syscall_id, 3> {
int64_t operator()(int64_t p1,int64_t p2,int64_t p3) const {
int64_t ret;
asm volatile
(
"syscall"
: "=a" (ret)
: "0"(syscall_id), "D"(p1), "S"(p2), "d"(p3)
: "rcx", "r11", "memory"
);
return ret;
}
};
template<int64_t syscall_id>
requires is_x86_64_linux
struct syscall<syscall_id, 4> {
int64_t operator()(int64_t p1,int64_t p2,int64_t p3,int64_t p4) const {
int64_t ret;
register long r10 asm("r10") = p4;
asm volatile
(
"syscall"
: "=a" (ret)
: "0"(syscall_id), "D"(p1), "S"(p2), "d"(p3), "r"(r10)
: "rcx", "r11", "memory"
);
return ret;
}
};
template<int64_t syscall_id>
requires is_x86_64_linux
struct syscall<syscall_id, 5> {
int64_t operator()(int64_t p1,int64_t p2,int64_t p3,int64_t p4,int64_t p5) const {
int64_t ret;
register long r10 asm("r10") = p4;
register long r8 asm("r8") = p5;
asm volatile
(
"syscall"
: "=a" (ret)
: "0"(syscall_id), "D"(p1), "S"(p2), "d"(p3), "r"(r10), "r"(r8)
: "rcx", "r11", "memory"
);
return ret;
}
};
template<int64_t syscall_id>
requires is_x86_64_linux
struct syscall<syscall_id, 6> {
int64_t operator()(int64_t p1,int64_t p2,int64_t p3,int64_t p4,int64_t p5,int64_t p6) const {
int64_t ret;
register long r10 asm("r10") = p4;
register long r8 asm("r8") = p5;
register long r9 asm("r9") = p6;
asm volatile
(
"syscall"
: "=a" (ret)
: "0"(syscall_id), "D"(p1), "S"(p2), "d"(p3), "r"(r10), "r"(r8), "r"(r9)
: "rcx", "r11", "memory"
);
return ret;
}
};
constexpr auto _read = syscall<0, 3>{};
constexpr auto _write = syscall<1, 3>{};
constexpr auto _mmap = syscall<9, 6>{};
constexpr auto _munmap = syscall<11, 2>{};
constexpr auto _exit = syscall<60, 1>{};
inline int read(int fd, char* buffer, size_t sz) {
return _read((int64_t)fd, (int64_t)buffer, (int64_t)sz);
}
inline int write(int fd, char* buffer, size_t sz) {
return _write((int64_t)fd, (int64_t)buffer, (int64_t)sz);
}
inline void* mmap(void *addr, size_t length, int prot, int flags, int fd, int64_t offset) {
return (void*)_mmap((int64_t)addr, (int64_t)length, (int64_t)prot, (int64_t)flags, (int64_t)fd, (int64_t)offset);
}
inline int munmap(void *addr, size_t length) {
return _munmap((int64_t)addr, (int64_t)length);
}
extern "C" {
/// Yes, __attribute__((__noreturn__)), not [[noreturn]], because some God forsaken potato decided that those attributes are not the attributes I am looking for
inline __attribute__ ((__noreturn__)) void exit(int status) {
_exit((int64_t)status);
while(true);
}
}
inline int read(int fd, gp::buffer<char> buffer) {
return _read((int64_t)fd, (int64_t)buffer.begin().data, (int64_t)buffer.size());
}
inline int write(int fd, gp::buffer<char> buffer) {
return _write((int64_t)fd, (int64_t)buffer.begin().data, (int64_t)buffer.size());
}