User/Kernel - ARMv7 fixes (relocation of .text)

[tpg/acess2.git] / KernelLand / Kernel / syscalls.c

diff --git a/KernelLand/Kernel/syscalls.c b/KernelLand/Kernel/syscalls.c
index bfd68bf..3dc1955 100644 (file)
--- a/KernelLand/Kernel/syscalls.c
+++ b/KernelLand/Kernel/syscalls.c
@@ -38,6 +38,7 @@ extern Uint   Binary_Load(const char *file, Uint *entryPoint);
 void   SyscallHandler(tSyscallRegs *Regs);
  int   Syscall_ValidString(const char *Addr);
  int   Syscall_Valid(int Size, const void *Addr);
+ int   Syscall_MM_SetFlags(const void *Addr, Uint Flags, Uint Mask);
 
 // === CODE ===
 // TODO: Do sanity checking on arguments, ATM the user can really fuck with the kernel
@@ -114,6 +115,11 @@ void SyscallHandler(tSyscallRegs *Regs)
        // -- Unmap an address
        case SYS_UNMAP:         MM_Deallocate(Regs->Arg1);      break;
        
+       // -- Change the protection on an address
+       case SYS_SETFLAGS:
+               ret = Syscall_MM_SetFlags((void*)Regs->Arg1, Regs->Arg2, Regs->Arg3);
+               break;
+
        // -- Get Thread/Process IDs
        case SYS_GETTID:        ret = Threads_GetTID(); break;
        case SYS_GETPID:        ret = Threads_GetPID(); break;
@@ -398,3 +404,21 @@ int Syscall_Valid(int Size, const void *Addr)
        
        return CheckMem( Addr, Size );
 }
+
+int Syscall_MM_SetFlags(const void *Addr, Uint Flags, Uint Mask)
+{
+       tPAddr  paddr = MM_GetPhysAddr(Addr);
+       Flags &= MM_PFLAG_RO|MM_PFLAG_EXEC;
+       Mask &= MM_PFLAG_RO|MM_PFLAG_EXEC;
+       // Enable write?
+       if( (Mask & MM_PFLAG_RO) && !(Flags & MM_PFLAG_RO) ) {
+               void    *node;
+               // HACK - Assume that RO mmap'd files are immutable
+               if( MM_GetPageNode(paddr, &node) == 0 && node ) {
+                       Flags |= MM_PFLAG_COW;
+                       Mask |= MM_PFLAG_COW;
+               }
+       }
+       MM_SetFlags((tVAddr)Addr, Flags, Mask);
+       return 0;
+}