kaguya
119 lines
3.9 KiB
C++
119 lines
3.9 KiB
C++
#pragma once
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#include <errno.h>
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#include <mlibc/tcb.hpp>
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#include <mlibc/thread.hpp>
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#include <mlibc-config.h>
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#include <utility>
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#include <sys/syscall.h>
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#include <bits/syscall.h>
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using sc_word_t = __sc_word_t;
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extern "C" {
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extern sc_word_t __mlibc_do_asm_cp_syscall(int sc, sc_word_t arg1, sc_word_t arg2,
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sc_word_t arg3, sc_word_t arg4, sc_word_t arg5, sc_word_t arg6);
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extern void __mlibc_do_cancel();
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}
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namespace mlibc {
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// C++ wrappers for the extern "C" functions.
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inline sc_word_t do_nargs_syscall(int sc) {
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return __do_syscall0(sc);
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}
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inline sc_word_t do_nargs_syscall(int sc, sc_word_t arg1) {
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return __do_syscall1(sc, arg1);
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}
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inline sc_word_t do_nargs_syscall(int sc, sc_word_t arg1, sc_word_t arg2) {
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return __do_syscall2(sc, arg1, arg2);
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}
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inline sc_word_t do_nargs_syscall(int sc, sc_word_t arg1, sc_word_t arg2, sc_word_t arg3) {
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return __do_syscall3(sc, arg1, arg2, arg3);
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}
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inline sc_word_t do_nargs_syscall(int sc, sc_word_t arg1, sc_word_t arg2, sc_word_t arg3,
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sc_word_t arg4) {
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return __do_syscall4(sc, arg1, arg2, arg3, arg4);
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}
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inline sc_word_t do_nargs_syscall(int sc, sc_word_t arg1, sc_word_t arg2, sc_word_t arg3,
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sc_word_t arg4, sc_word_t arg5) {
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return __do_syscall5(sc, arg1, arg2, arg3, arg4, arg5);
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}
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inline sc_word_t do_nargs_syscall(int sc, sc_word_t arg1, sc_word_t arg2, sc_word_t arg3,
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sc_word_t arg4, sc_word_t arg5, sc_word_t arg6) {
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return __do_syscall6(sc, arg1, arg2, arg3, arg4, arg5, arg6);
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}
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inline sc_word_t do_nargs_cp_syscall(int sc, sc_word_t arg1) {
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return __mlibc_do_asm_cp_syscall(sc, arg1, 0, 0, 0, 0, 0);
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}
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inline sc_word_t do_nargs_cp_syscall(int sc, sc_word_t arg1, sc_word_t arg2) {
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return __mlibc_do_asm_cp_syscall(sc, arg1, arg2, 0, 0, 0, 0);
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}
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inline sc_word_t do_nargs_cp_syscall(int sc, sc_word_t arg1, sc_word_t arg2,
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sc_word_t arg3) {
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return __mlibc_do_asm_cp_syscall(sc, arg1, arg2, arg3, 0, 0, 0);
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}
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inline sc_word_t do_nargs_cp_syscall(int sc, sc_word_t arg1, sc_word_t arg2, sc_word_t arg3,
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sc_word_t arg4) {
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return __mlibc_do_asm_cp_syscall(sc, arg1, arg2, arg3, arg4, 0, 0);
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}
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inline sc_word_t do_nargs_cp_syscall(int sc, sc_word_t arg1, sc_word_t arg2, sc_word_t arg3,
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sc_word_t arg4, sc_word_t arg5) {
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return __mlibc_do_asm_cp_syscall(sc, arg1, arg2, arg3, arg4, arg5, 0);
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}
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inline sc_word_t do_nargs_cp_syscall(int sc, sc_word_t arg1, sc_word_t arg2, sc_word_t arg3,
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sc_word_t arg4, sc_word_t arg5, sc_word_t arg6) {
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return __mlibc_do_asm_cp_syscall(sc, arg1, arg2, arg3, arg4, arg5, arg6);
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}
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// Type-safe syscall result type.
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enum class sc_result_t : sc_word_t { };
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// Cast to the argument type of the extern "C" functions.
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inline sc_word_t sc_cast(long x) { return x; }
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inline sc_word_t sc_cast(const void *x) { return reinterpret_cast<sc_word_t>(x); }
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template<typename... T>
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sc_result_t do_syscall(int sc, T... args) {
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return static_cast<sc_result_t>(do_nargs_syscall(sc, sc_cast(args)...));
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}
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inline int sc_error(sc_result_t ret) {
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auto v = static_cast<sc_word_t>(ret);
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if(static_cast<unsigned long>(v) > -4096UL)
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return -v;
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return 0;
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}
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template<typename... T>
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sc_result_t do_cp_syscall(int sc, T... args) {
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#if __MLIBC_POSIX_OPTION && !MLIBC_BUILDING_RTLD
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auto result = static_cast<sc_result_t>(do_nargs_cp_syscall(sc, sc_cast(args)...));
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if (int e = sc_error(result); e) {
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auto tcb = reinterpret_cast<Tcb*>(get_current_tcb());
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if (tcb_cancelled(tcb->cancelBits) && e == EINTR) {
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__mlibc_do_cancel();
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__builtin_unreachable();
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}
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}
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return result;
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#else
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return do_syscall(sc, std::forward<T>(args)...);
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#endif // __MLIBC_POSIX_OPTION || !MLIBC_BUILDING_RTLD
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}
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// Cast from the syscall result type.
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template<typename T>
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T sc_int_result(sc_result_t ret) {
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auto v = static_cast<sc_word_t>(ret);
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return v;
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}
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template<typename T>
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T *sc_ptr_result(sc_result_t ret) {
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auto v = static_cast<sc_word_t>(ret);
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return reinterpret_cast<T *>(v);
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}
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}
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