Restructured and rewritten entire codebase

2025-07-11 15:29:18 +00:00 · 2023-10-09 01:16:24 +03:00
parent 446a571018
commit 889e1522a3
484 changed files with 15683 additions and 14032 deletions
--- a/syscalls/native/mprotect.cpp
+++ b/syscalls/native/mprotect.cpp
@ -0,0 +1,107 @@
+/*
+	This file is part of Fennix Kernel.
+
+	Fennix Kernel is free software: you can redistribute it and/or
+	modify it under the terms of the GNU General Public License as
+	published by the Free Software Foundation, either version 3 of
+	the License, or (at your option) any later version.
+
+	Fennix Kernel is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
+*/
+
+#include <syscalls.hpp>
+
+#include <memory.hpp>
+#include <lock.hpp>
+#include <exec.hpp>
+#include <errno.h>
+#include <debug.h>
+
+#include "../../syscalls.h"
+#include "../../kernel.h"
+#include "../../ipc.h"
+
+using InterProcessCommunication::IPC;
+using InterProcessCommunication::IPCID;
+using Tasking::PCB;
+using Tasking::TCB;
+using Tasking::TaskState::Ready;
+using Tasking::TaskState::Terminated;
+using namespace Memory;
+
+#define SysFrm SyscallsFrame
+
+#if defined(a64)
+typedef long arch_t;
+#elif defined(a32)
+typedef int arch_t;
+#endif
+
+/* https://pubs.opengroup.org/onlinepubs/009604499/functions/mprotect.html */
+int sys_mprotect(SysFrm *,
+				 void *addr, size_t len, int prot)
+{
+	if (len == 0)
+		return -EINVAL;
+
+	if (uintptr_t(addr) % PAGE_SIZE)
+		return -EINVAL;
+
+	bool p_None = prot & sc_PROT_NONE;
+	bool p_Read = prot & sc_PROT_READ;
+	bool p_Write = prot & sc_PROT_WRITE;
+	// bool p_Exec = prot & sc_PROT_EXEC;
+
+	Tasking::PCB *pcb = thisProcess;
+	Memory::Virtual vmm = Memory::Virtual(pcb->PageTable);
+
+	for (uintptr_t i = uintptr_t(addr);
+		 i < uintptr_t(addr) + len;
+		 i += PAGE_SIZE)
+	{
+		if (likely(!vmm.Check((void *)i, Memory::G)))
+		{
+			Memory::PageTableEntry *pte = vmm.GetPTE(addr);
+			if (!pte->Present ||
+				(!pte->UserSupervisor && p_Read) ||
+				(!pte->ReadWrite && p_Write))
+			{
+				debug("Page %p is not mapped with the correct permissions",
+					  (void *)i);
+				return -EACCES;
+			}
+
+			pte->Present = p_None;
+			pte->UserSupervisor = p_Read;
+			pte->ReadWrite = p_Write;
+			// pte->ExecuteDisable = p_Exec;
+
+#if defined(a64)
+			CPU::x64::invlpg(addr);
+#elif defined(a32)
+			CPU::x32::invlpg(addr);
+#elif defined(aa64)
+			asmv("dsb sy");
+			asmv("tlbi vae1is, %0"
+				 :
+				 : "r"(addr)
+				 : "memory");
+			asmv("dsb sy");
+			asmv("isb");
+#endif
+		}
+		else
+		{
+			warn("%p is a global page", (void *)i);
+			return -ENOMEM;
+		}
+	}
+
+	return 0;
+}