Fixes to error handling and User text mappings

[tpg/acess2.git] / Kernel / arch / x86 / proc.c

diff --git a/Kernel/arch/x86/proc.c b/Kernel/arch/x86/proc.c
index 6298067..e988416 100644 (file)
--- a/Kernel/arch/x86/proc.c
+++ b/Kernel/arch/x86/proc.c
@@ -39,6 +39,7 @@ extern tThread        *Threads_GetNextToRun(int CPU);
 extern void    Threads_Dump();
 extern tThread *Threads_CloneTCB(Uint *Err, Uint Flags);
 extern void    Isr8(); // Double Fault
+extern void    Proc_AlterUserReturnAddr();
 
 // === PROTOTYPES ===
 void   ArchThreads_Init();
@@ -51,6 +52,7 @@ tThread       *Proc_GetCurThread();
 void   Proc_ChangeStack();
  int   Proc_Clone(Uint *Err, Uint Flags);
 void   Proc_StartProcess(Uint16 SS, Uint Stack, Uint Flags, Uint16 CS, Uint IP);
+void   Proc_CallFaultHandler(tThread *Thread);
 void   Proc_Scheduler();
 
 // === GLOBALS ===
@@ -693,6 +695,18 @@ int Proc_Demote(Uint *Err, int Dest, tRegs *Regs)
        return 0;
 }
 
+/**
+ * \brief Calls a signal handler in user mode
+ * \note Used for signals
+ */
+void Proc_CallFaultHandler(tThread *Thread)
+{
+       // Rewinds the stack and calls the user function
+       // Never returns
+       __asm__ __volatile__ ("mov %0, %%ebp;\n\tcall Proc_AlterUserReturnAddr" :: "r"(Thread->FaultHandler));
+       for(;;);
+}
+
 /**
  * \fn void Proc_Scheduler(int CPU)
  * \brief Swap current thread and clears dead threads