asm.zig

inline fn wa_syscall(nr: usize) usize {
    return asm volatile ("swi %[nr]"
        : [ret] "={r}" (-> usize)
        : [nr] "{i}" (nr)
        : "memory", "r1", "r2", "r3", "r4", "r12", "lr"
    );
}

inline fn wa_syscall1(nr: usize, p1: usize) usize {
    return asm volatile ("swi %[nr]"
        : [ret] "={r}" (-> usize)
        : [nr] "{i}" (nr),
          [r0] "{r}" (p1)
        : "memory", "r1", "r2", "r3", "r4", "r12", "lr"
    );
}

inline fn wa_syscall2(nr: usize, p1: usize, p2: usize) usize {
    return asm volatile ("swi %[nr]\n"
        : [ret] "={r}" (-> usize)
        : [nr] "{i}" (nr),
          [r0] "{r}" (p1),
          [r1] "{r}" (p2)
        : "memory", "r2", "r3", "r4", "r12", "lr"
    );
}

inline fn wa_syscall3(nr: usize, p1: usize, p2: usize, p3: usize) usize {
    return asm volatile ("swi %[nr]\n"
        : [ret] "=r" (-> usize)
        : [nr] "{i}" (nr),
          [r0] "{r}" (p1),
          [r1] "{r}" (p2),
          [r2] "{r}" (p3)
        : "memory", "r3", "r4", "r12", "lr"
    );
}

inline fn wa_syscall4(nr: usize, p1: usize, p2: usize, p3: usize, p4: usize) usize {
    return asm volatile ("swi %[nr]\n"
        : [ret] "={r}" (-> usize)
        : [nr] "{i}" (nr),
          [r0] "{r}" (p1),
          [r1] "{r}" (p2),
          [r2] "{r}" (p3),
          [r3] "{r}" (p4)
        : "memory", "r4", "r12", "lr"
    );
}