system_call.h

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#pragma once
 
#include "asm/unistd.h"
#include "di/util/prelude.h"
#include "dius/arch_system_call.h"
#include "dius/c_definitions.h"
#include "dius/error.h"
 
namespace dius::system {
enum class Number : int {
    io_uring_enter = __NR_io_uring_enter,
    io_uring_setup = __NR_io_uring_setup,
    io_uring_register = __NR_io_uring_register,
    pread = __NR_pread64,
    pwrite = __NR_pwrite64,
    read = __NR_read,
    write = __NR_write,
    close = __NR_close,
    openat = __NR_openat,
    mmap = __NR_mmap,
    munmap = __NR_munmap,
    getdents64 = __NR_getdents64,
    fstatat64 = __NR_newfstatat,
    ftruncate = __NR_ftruncate,
    arch_prctl = __NR_arch_prctl,
    brk = __NR_brk,
    exit_group = __NR_exit_group,
    clone3 = __NR_clone3,
    execve = __NR_execve,
    wait4 = __NR_wait4,
    exit = __NR_exit,
    futex = __NR_futex,
    lseek = __NR_lseek,
    mknodat = __NR_mknodat,
    mkdirat = __NR_mkdirat,
    bind = __NR_bind,
    listen = __NR_listen,
    ioctl = __NR_ioctl,
    rt_sigprocmask = __NR_rt_sigprocmask,
    rt_sigtimedwait = __NR_rt_sigtimedwait,
    kill = __NR_kill,
    getpid = __NR_getpid,
    clock_nanosleep = __NR_clock_nanosleep,
    clock_gettime = __NR_clock_gettime,
    setsid = __NR_setsid,
    dup2 = __NR_dup2,
    pipe2 = __NR_pipe2,
    chdir = __NR_chdir,
    fchdir = __NR_fchdir,
    rmdir = __NR_rmdir,
    unlink = __NR_unlink,
    uname = __NR_uname,
};
 
using SystemCallArg = unsigned long;
using SystemCallResult = long;
 
namespace detail {
    template<typename T>
    concept SystemCallArgument = di::concepts::ConstructibleFrom<SystemCallArg, T>;
 
    template<typename T>
    concept SystemCallResult = di::concepts::ConstructibleFrom<T, dius::system::SystemCallResult>;
}
 
template<detail::SystemCallResult R>
auto system_call(Number number) -> di::Expected<R, di::BasicError> {
    SystemCallResult res = di::to_underlying(number);
    asm volatile(DIUS_SYSTEM_CALL_INSTRUCTION
                 : DIUS_SYSTEM_CALL_ASM_RESULT(res)
                 : DIUS_SYSTEM_CALL_ASM_NUMBER(res)
                 : DIUS_SYSTEM_CALL_CLOBBER);
    if (res < 0) {
        return di::Unexpected(di::BasicError(-res));
    }
    return R(res);
}
 
template<detail::SystemCallResult R, detail::SystemCallArgument T1>
auto system_call(Number number, T1&& a1) -> di::Expected<R, di::BasicError> {
    SystemCallResult res = di::to_underlying(number);
    auto y1 = SystemCallArg(a1);
    register SystemCallArg x1 asm(DIUS_SYSTEM_CALL_ASM_ARG1) = y1;
    asm volatile(DIUS_SYSTEM_CALL_INSTRUCTION
                 : DIUS_SYSTEM_CALL_ASM_RESULT(res)
                 : DIUS_SYSTEM_CALL_ASM_NUMBER(res), "r"(x1)
                 : DIUS_SYSTEM_CALL_CLOBBER);
    if (res < 0) {
        return di::Unexpected(di::BasicError(-res));
    }
    return R(res);
}
 
template<detail::SystemCallResult R, detail::SystemCallArgument T1, detail::SystemCallArgument T2>
auto system_call(Number number, T1&& a1, T2&& a2) -> di::Expected<R, di::BasicError> {
    SystemCallResult res = di::to_underlying(number);
    auto y1 = SystemCallArg(a1);
    auto y2 = SystemCallArg(a2);
    register SystemCallArg x1 asm(DIUS_SYSTEM_CALL_ASM_ARG1) = y1;
    register SystemCallArg x2 asm(DIUS_SYSTEM_CALL_ASM_ARG2) = y2;
    asm volatile(DIUS_SYSTEM_CALL_INSTRUCTION
                 : DIUS_SYSTEM_CALL_ASM_RESULT(res)
                 : DIUS_SYSTEM_CALL_ASM_NUMBER(res), "r"(x1), "r"(x2)
                 : DIUS_SYSTEM_CALL_CLOBBER);
    if (res < 0) {
        return di::Unexpected(di::BasicError(-res));
    }
    return R(res);
}
 
template<detail::SystemCallResult R, detail::SystemCallArgument T1, detail::SystemCallArgument T2,
         detail::SystemCallArgument T3>
auto system_call(Number number, T1&& a1, T2&& a2, T3&& a3) -> di::Expected<R, di::BasicError> {
    SystemCallResult res = di::to_underlying(number);
    auto y1 = SystemCallArg(a1);
    auto y2 = SystemCallArg(a2);
    auto y3 = SystemCallArg(a3);
    register SystemCallArg x1 asm(DIUS_SYSTEM_CALL_ASM_ARG1) = y1;
    register SystemCallArg x2 asm(DIUS_SYSTEM_CALL_ASM_ARG2) = y2;
    register SystemCallArg x3 asm(DIUS_SYSTEM_CALL_ASM_ARG3) = y3;
    asm volatile(DIUS_SYSTEM_CALL_INSTRUCTION
                 : DIUS_SYSTEM_CALL_ASM_RESULT(res)
                 : DIUS_SYSTEM_CALL_ASM_NUMBER(res), "r"(x1), "r"(x2), "r"(x3)
                 : DIUS_SYSTEM_CALL_CLOBBER);
    if (res < 0) {
        return di::Unexpected(di::BasicError(-res));
    }
    return R(res);
}
 
template<detail::SystemCallResult R, detail::SystemCallArgument T1, detail::SystemCallArgument T2,
         detail::SystemCallArgument T3, detail::SystemCallArgument T4>
auto system_call(Number number, T1&& a1, T2&& a2, T3&& a3, T4&& a4) -> di::Expected<R, di::BasicError> {
    SystemCallResult res = di::to_underlying(number);
    auto y1 = SystemCallArg(a1);
    auto y2 = SystemCallArg(a2);
    auto y3 = SystemCallArg(a3);
    auto y4 = SystemCallArg(a4);
    register SystemCallArg x1 asm(DIUS_SYSTEM_CALL_ASM_ARG1) = y1;
    register SystemCallArg x2 asm(DIUS_SYSTEM_CALL_ASM_ARG2) = y2;
    register SystemCallArg x3 asm(DIUS_SYSTEM_CALL_ASM_ARG3) = y3;
    register SystemCallArg x4 asm(DIUS_SYSTEM_CALL_ASM_ARG4) = y4;
    asm volatile(DIUS_SYSTEM_CALL_INSTRUCTION
                 : DIUS_SYSTEM_CALL_ASM_RESULT(res)
                 : DIUS_SYSTEM_CALL_ASM_NUMBER(res), "r"(x1), "r"(x2), "r"(x3), "r"(x4)
                 : DIUS_SYSTEM_CALL_CLOBBER);
    if (res < 0) {
        return di::Unexpected(di::BasicError(-res));
    }
    return R(res);
}
 
template<detail::SystemCallResult R, detail::SystemCallArgument T1, detail::SystemCallArgument T2,
         detail::SystemCallArgument T3, detail::SystemCallArgument T4, detail::SystemCallArgument T5>
auto system_call(Number number, T1&& a1, T2&& a2, T3&& a3, T4&& a4, T5&& a5) -> di::Expected<R, di::BasicError> {
    SystemCallResult res = di::to_underlying(number);
    SystemCallArg y1 = SystemCallArg(a1);
    SystemCallArg y2 = SystemCallArg(a2);
    SystemCallArg y3 = SystemCallArg(a3);
    SystemCallArg y4 = SystemCallArg(a4);
    SystemCallArg y5 = SystemCallArg(a5);
    register SystemCallArg x1 asm(DIUS_SYSTEM_CALL_ASM_ARG1) = y1;
    register SystemCallArg x2 asm(DIUS_SYSTEM_CALL_ASM_ARG2) = y2;
    register SystemCallArg x3 asm(DIUS_SYSTEM_CALL_ASM_ARG3) = y3;
    register SystemCallArg x4 asm(DIUS_SYSTEM_CALL_ASM_ARG4) = y4;
    register SystemCallArg x5 asm(DIUS_SYSTEM_CALL_ASM_ARG5) = y5;
    asm volatile(DIUS_SYSTEM_CALL_INSTRUCTION
                 : DIUS_SYSTEM_CALL_ASM_RESULT(res)
                 : DIUS_SYSTEM_CALL_ASM_NUMBER(res), "r"(x1), "r"(x2), "r"(x3), "r"(x4), "r"(x5)
                 : DIUS_SYSTEM_CALL_CLOBBER);
    if (res < 0) {
        return di::Unexpected(di::BasicError(-res));
    }
    return R(res);
}
 
template<detail::SystemCallResult R, detail::SystemCallArgument T1, detail::SystemCallArgument T2,
         detail::SystemCallArgument T3, detail::SystemCallArgument T4, detail::SystemCallArgument T5,
         detail::SystemCallArgument T6>
auto system_call(Number number, T1&& a1, T2&& a2, T3&& a3, T4&& a4, T5&& a5, T6&& a6)
    -> di::Expected<R, di::BasicError> {
    SystemCallResult res = di::to_underlying(number);
    auto y1 = SystemCallArg(a1);
    auto y2 = SystemCallArg(a2);
    auto y3 = SystemCallArg(a3);
    auto y4 = SystemCallArg(a4);
    auto y5 = SystemCallArg(a5);
    auto y6 = SystemCallArg(a6);
    register SystemCallArg x1 asm(DIUS_SYSTEM_CALL_ASM_ARG1) = y1;
    register SystemCallArg x2 asm(DIUS_SYSTEM_CALL_ASM_ARG2) = y2;
    register SystemCallArg x3 asm(DIUS_SYSTEM_CALL_ASM_ARG3) = y3;
    register SystemCallArg x4 asm(DIUS_SYSTEM_CALL_ASM_ARG4) = y4;
    register SystemCallArg x5 asm(DIUS_SYSTEM_CALL_ASM_ARG5) = y5;
    register SystemCallArg x6 asm(DIUS_SYSTEM_CALL_ASM_ARG6) = y6;
    asm volatile(DIUS_SYSTEM_CALL_INSTRUCTION
                 : DIUS_SYSTEM_CALL_ASM_RESULT(res)
                 : DIUS_SYSTEM_CALL_ASM_NUMBER(res), "r"(x1), "r"(x2), "r"(x3), "r"(x4), "r"(x5), "r"(x6)
                 : DIUS_SYSTEM_CALL_CLOBBER);
    if (res < 0) {
        return di::Unexpected(di::BasicError(-res));
    }
    return R(res);
}
}