X-Git-Url: https://git.ucc.asn.au/?a=blobdiff_plain;ds=sidebyside;f=Kernel%2Farch%2Fx86%2Ferrors.c;h=b9ff17d22f1eaec052d3fdd99e2d8c9c8da17867;hb=b6c3b3cf61caafbd91bbf3acc81995e472656a5b;hp=2c3582cdcf2d4e14b54a1adbd5f2a2637dbd85dc;hpb=f119d0e5b18b7286d04fc536a94e0f96e3c51714;p=tpg%2Facess2.git

diff --git a/Kernel/arch/x86/errors.c b/Kernel/arch/x86/errors.c
index 2c3582cd..b9ff17d2 100644
--- a/Kernel/arch/x86/errors.c
+++ b/Kernel/arch/x86/errors.c
@@ -4,11 +4,18 @@
  * - CPU Error Handler
  */
 #include <common.h>
+#include <proc.h>
+
+// === CONSTANTS ===
+#define	MAX_BACKTRACE	8	//!< Maximum distance to trace the stack backwards
 
 // === IMPORTS ===
 extern void	MM_PageFault(Uint Addr, Uint ErrorCode, tRegs *Regs);
 extern void Threads_Dump();
 
+// === PROTOTYPES ===
+void	Error_Backtrace(Uint eip, Uint ebp);
+
 // === CODE ===
 /**
  * \fn void ErrorHandler(tRegs *Regs)
@@ -45,8 +52,63 @@ void ErrorHandler(tRegs *Regs)
 	__asm__ __volatile__ ("mov %%cr3, %0":"=r"(cr));
 	Warning(" CR3: 0x%08x", cr);
 	
+	// Print Stack Backtrace
+	Error_Backtrace(Regs->eip, Regs->ebp);
+	
 	// Dump running threads
 	Threads_Dump();
 	
 	for(;;)	__asm__ __volatile__ ("hlt");
 }
+/**
+ * \fn void Error_Backtrace(Uint eip, Uint ebp)
+ * \brief Unrolls the stack to trace execution
+ */
+void Error_Backtrace(Uint eip, Uint ebp)
+{
+	 int	i = 0;
+	Uint	delta = 0;
+	char	*str = NULL;
+	
+	//if(eip < 0xC0000000 && eip > 0x1000)
+	//{
+	//	LogF("Backtrace: User - 0x%x\n", eip);
+	//	return;
+	//}
+	
+	if(eip > 0xE0000000)
+	{
+		LogF("Backtrace: Data Area - 0x%x\n", eip);
+		return;
+	}
+	
+	if(eip > 0xC8000000)
+	{
+		LogF("Backtrace: Kernel Module - 0x%x\n", eip);
+		return;
+	}
+	
+	//str = Debug_GetSymbol(eip, &delta);
+	if(str == NULL)
+		LogF("Backtrace: 0x%x", eip);
+	else
+		LogF("Backtrace: %s+0x%x", str, delta);
+	if(!MM_GetPhysAddr(ebp))
+	{
+		LogF("\nBacktrace: Invalid EBP, stopping\n");
+		return;
+	}
+	
+	
+	while( MM_GetPhysAddr(ebp) && i < MAX_BACKTRACE )
+	{
+		//str = Debug_GetSymbol(*(Uint*)(ebp+4), &delta);
+		if(str == NULL)
+			LogF(" >> 0x%x", *(Uint*)(ebp+4));
+		else
+			LogF(" >> %s+0x%x", str, delta);
+		ebp = *(Uint*)ebp;
+		i++;
+	}
+	LogF("\n");
+}