X-Git-Url: https://git.ucc.asn.au/?a=blobdiff_plain;f=Kernel%2Farch%2Fx86%2Fproc.c;h=e98841618b0a3a10fd827cf3788b28dc2b4cffae;hb=7a6a1cbc62289d64d604fb2cb204d21659c4905e;hp=62980674215919ebd538b0ee2ce2f0403e2c1795;hpb=7d2f8503550796a3cd42d01f944c2baa49a2fcfa;p=tpg%2Facess2.git

diff --git a/Kernel/arch/x86/proc.c b/Kernel/arch/x86/proc.c
index 62980674..e9884161 100644
--- 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