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https://github.com/Fennix-Project/Kernel.git
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Restructured and rewritten entire codebase
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Alex
230
syscalls/native.cpp
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230
syscalls/native.cpp
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/*
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This file is part of Fennix Kernel.
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Fennix Kernel is free software: you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation, either version 3 of
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the License, or (at your option) any later version.
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Fennix Kernel is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include <syscalls.hpp>
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#include <memory.hpp>
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#include <lock.hpp>
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#include <exec.hpp>
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#include <errno.h>
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#include <debug.h>
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#include "../syscalls.h"
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#include "../kernel.h"
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#include "../ipc.h"
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struct SyscallData
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{
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const char *Name;
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void *Handler;
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int RequiredID;
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};
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using InterProcessCommunication::IPC;
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using InterProcessCommunication::IPCID;
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using Tasking::PCB;
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using Tasking::TCB;
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using Tasking::TaskState::Ready;
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using Tasking::TaskState::Terminated;
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using namespace Memory;
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#define SysFrm SyscallsFrame
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#if defined(a64)
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typedef long arch_t;
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#elif defined(a32)
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typedef int arch_t;
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#endif
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void sys_exit(SysFrm *, int status);
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void *sys_mmap(SysFrm *,
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void *addr, size_t len,
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int prot, int flags,
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int fildes, off_t off);
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int sys_munmap(SysFrm *,
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void *addr, size_t len);
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int sys_mprotect(SysFrm *,
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void *addr, size_t len,
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int prot);
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int sys_open(SysFrm *,
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const char *path,
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int oflag, mode_t mode);
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int sys_close(SysFrm *,
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int fildes);
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ssize_t sys_read(SysFrm *, int fildes,
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void *buf, size_t nbyte);
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ssize_t sys_write(SysFrm *, int fildes,
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const void *buf,
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size_t nbyte);
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off_t sys_lseek(SysFrm *, int fildes,
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off_t offset, int whence);
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int sys_fork(SysFrm *Frame);
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static SyscallData NativeSyscallsTable[sc_MaxSyscall] = {
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[sc_exit] = {
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"exit",
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(void *)sys_exit,
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UINT16_MAX,
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},
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[sc_mmap] = {
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"mmap",
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(void *)sys_mmap,
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UINT16_MAX,
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},
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[sc_munmap] = {
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"munmap",
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(void *)sys_munmap,
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UINT16_MAX,
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},
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[sc_mprotect] = {
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"mprotect",
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(void *)sys_mprotect,
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UINT16_MAX,
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},
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[sc_open] = {
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"open",
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(void *)sys_open,
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UINT16_MAX,
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},
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[sc_close] = {
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"close",
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(void *)sys_close,
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UINT16_MAX,
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},
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[sc_read] = {
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"read",
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(void *)sys_read,
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UINT16_MAX,
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},
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[sc_write] = {
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"write",
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(void *)sys_write,
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UINT16_MAX,
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},
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[sc_lseek] = {
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"lseek",
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(void *)sys_lseek,
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UINT16_MAX,
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},
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[sc_fork] = {
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"fork",
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(void *)sys_fork,
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UINT16_MAX,
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},
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};
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uintptr_t HandleNativeSyscalls(SysFrm *Frame)
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{
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#if defined(a64)
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if (unlikely(Frame->rax > sc_MaxSyscall))
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{
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fixme("Syscall %ld not implemented.", Frame->rax);
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return -ENOSYS;
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}
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SyscallData Syscall = NativeSyscallsTable[Frame->rax];
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uintptr_t (*call)(SysFrm *, uintptr_t, ...) =
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r_cst(uintptr_t(*)(SysFrm *, uintptr_t, ...),
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Syscall.Handler);
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if (unlikely(!call))
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{
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error("Syscall %s(%d) not implemented.",
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Syscall.Name, Frame->rax);
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return -ENOSYS;
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}
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int euid = thisProcess->Security.Effective.UserID;
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int egid = thisProcess->Security.Effective.GroupID;
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int reqID = Syscall.RequiredID;
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if (euid > reqID || egid > reqID)
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{
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warn("Process %s(%d) tried to access a system call \"%s\" with insufficient privileges.",
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thisProcess->Name, thisProcess->ID, Syscall.Name);
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debug("Required: %d; Effective u:%d, g:%d", reqID, euid, egid);
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return -EPERM;
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}
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debug("> [%d:\"%s\"]( %#lx %#lx %#lx %#lx %#lx %#lx )",
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Frame->rax, Syscall.Name,
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Frame->rdi, Frame->rsi, Frame->rdx,
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Frame->r10, Frame->r8, Frame->r9);
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long sc_ret = call(Frame,
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Frame->rdi, Frame->rsi, Frame->rdx,
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Frame->r10, Frame->r8, Frame->r9);
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debug("< [%d:\"%s\"] = %d",
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Frame->rax, Syscall.Name, sc_ret);
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return sc_ret;
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#elif defined(a32)
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if (unlikely(Frame->eax > sc_MaxSyscall))
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{
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fixme("Syscall %ld not implemented.", Frame->eax);
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return -ENOSYS;
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}
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SyscallData Syscall = NativeSyscallsTable[Frame->eax];
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uintptr_t (*call)(SysFrm *, uintptr_t, ...) =
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r_cst(uintptr_t(*)(SysFrm *, uintptr_t, ...),
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Syscall.Handler);
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if (unlikely(!call))
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{
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error("Syscall %s(%d) not implemented.",
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Syscall.Name, Frame->eax);
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return -ENOSYS;
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}
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int euid = thisProcess->Security.Effective.UserID;
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int egid = thisProcess->Security.Effective.GroupID;
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int reqID = Syscall.RequiredID;
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if (euid > reqID || egid > reqID)
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{
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warn("Process %s(%d) tried to access a system call \"%s\" with insufficient privileges.",
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thisProcess->Name, thisProcess->ID, Syscall.Name);
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debug("Required: %d; Effective u:%d, g:%d", reqID, euid, egid);
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return -EPERM;
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}
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debug("> [%d:\"%s\"]( %#x %#x %#x %#x %#x %#x )",
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Frame->eax, Syscall.Name,
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Frame->ebx, Frame->ecx, Frame->edx,
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Frame->esi, Frame->edi, Frame->ebp);
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int sc_ret = call(Frame,
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Frame->ebx, Frame->ecx, Frame->edx,
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Frame->esi, Frame->edi, Frame->ebp);
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debug("< [%d:\"%s\"] = %d",
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Frame->eax, Syscall.Name, sc_ret);
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return sc_ret;
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#elif defined(aa64)
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return -ENOSYS;
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#endif
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}
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