X-Git-Url: https://git.ucc.asn.au/?a=blobdiff_plain;f=Kernel%2Farch%2Fx86%2Fproc.c;h=e98841618b0a3a10fd827cf3788b28dc2b4cffae;hb=7a6a1cbc62289d64d604fb2cb204d21659c4905e;hp=3b5ceb2fbfd4edf8060a1699b306d99c7b2c3e61;hpb=54746c855c6e2fe42fde9f93b0ce3f41aeefc2e5;p=tpg%2Facess2.git

diff --git a/Kernel/arch/x86/proc.c b/Kernel/arch/x86/proc.c
index 3b5ceb2f..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
@@ -779,6 +793,14 @@ void Proc_Scheduler(int CPU)
 	#else
 		__asm__ __volatile__ ("mov %0, %%cr3"::"a"(thread->MemState.CR3));
 	#endif
+	
+	#if 0
+	if(thread->SavedState.ESP > 0xC0000000
+	&& thread->SavedState.ESP < thread->KernelStack-0x2000) {
+		Log_Warning("Proc", "Possible bad ESP %p (PID %i)", thread->SavedState.ESP);
+	}
+	#endif
+	
 	// Switch threads
 	__asm__ __volatile__ (
 		"mov %1, %%esp\n\t"	// Restore ESP