syscall.h

#ifndef SYSCALL_H
#define SYSCALL_H

#include <std/std.h>

void sys_install();
bool sys_installed();

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

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

#define DEFN_SYSCALL1(fn, num, P1) \
int sys_##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 sys_##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 sys_##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 sys_##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, P1, P2, P3, P4, P5) \
int sys_##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; \
}

void sys_insert(void* syscall);

#endif