#ifndef MELVIX_SYSCALL_H
#define MELVIX_SYSCALL_H

#include <stdint.h>

#define DECL_SYSCALL0(fn) int syscall_##fn();
#define DECL_SYSCALL1(fn, p1) int syscall_##fn(p1);
#define DECL_SYSCALL2(fn, p1, p2) int syscall_##fn(p1, p2);
#define DECL_SYSCALL3(fn, p1, p2, p3) int syscall_##fn(p1, p2, p3);
#define DECL_SYSCALL4(fn, p1, p2, p3, p4) int syscall_##fn(p1, p2, p3, p4);
#define DECL_SYSCALL5(fn, p1, p2, p3, p4, p5) int syscall_##fn(p1, p2, p3, p4, p5);

#define DEFN_SYSCALL0(fn, num)                                                                     \
	int syscall_##fn()                                                                         \
	{                                                                                          \
		int a;                                                                             \
		asm volatile("int $0x80" : "=a"(a) : "0"(num));                                    \
		return a;                                                                          \
	}

#define DEFN_SYSCALL1(fn, num, P1)                                                                 \
	int syscall_##fn(P1 p1)                                                                    \
	{                                                                                          \
		int a;                                                                             \
		asm volatile("int $0x80" : "=a"(a) : "0"(num), "b"((int)p1));                      \
		return a;                                                                          \
	}

#define DEFN_SYSCALL2(fn, num, P1, P2)                                                             \
	int syscall_##fn(P1 p1, P2 p2)                                                             \
	{                                                                                          \
		int a;                                                                             \
		asm volatile("int $0x80" : "=a"(a) : "0"(num), "b"((int)p1), "c"((int)p2));        \
		return a;                                                                          \
	}

#define DEFN_SYSCALL3(fn, num, P1, P2, P3)                                                         \
	int syscall_##fn(P1 p1, P2 p2, P3 p3)                                                      \
	{                                                                                          \
		int a;                                                                             \
		asm volatile("int $0x80"                                                           \
			     : "=a"(a)                                                             \
			     : "0"(num), "b"((int)p1), "c"((int)p2), "d"((int)p3));                \
		return a;                                                                          \
	}

#define DEFN_SYSCALL4(fn, num, P1, P2, P3, P4)                                                     \
	int syscall_##fn(P1 p1, P2 p2, P3 p3, P4 p4)                                               \
	{                                                                                          \
		int a;                                                                             \
		asm volatile("int $0x80"                                                           \
			     : "=a"(a)                                                             \
			     : "0"(num), "b"((int)p1), "c"((int)p2), "d"((int)p3), "S"((int)p4));  \
		return a;                                                                          \
	}

#define DEFN_SYSCALL5(fn, num)                                                                     \
	int syscall_##fn(P1 p1, P2 p2, P3 p3, P4 p4, P5 p5)                                        \
	{                                                                                          \
		int a;                                                                             \
		asm volatile("int $0x80"                                                           \
			     : "=a"(a)                                                             \
			     : "0"(num), "b"((int)p1), "c"((int)p2), "d"((int)p3), "S"((int)p4),   \
			       "D"((int)p5));                                                      \
		return a;                                                                          \
	}

/**
 * DECLARATIONS
 */
DECL_SYSCALL0(halt);

DECL_SYSCALL1(exit, u32);

DECL_SYSCALL0(fork);

DECL_SYSCALL4(read, char *, u32, u32, char *);

DECL_SYSCALL4(write, char *, u32, u32, char *);

DECL_SYSCALL1(exec, char *);

DECL_SYSCALL0(get_pid);

DECL_SYSCALL1(malloc, u32);

DECL_SYSCALL1(free, u32);

#endif