- fixed dbg

- exception stacksize can be larger than 32kB
- debugger entry on ctrl-c inside debugger terminal

git-svn-id: http://moon:8086/svn/mips@78 a8ebac50-d88d-4704-bea3-6648445a41b3

src/libsys/boards/denano/board.c

@@ -5,8 +5,8 @@
  */
 
 #include <stddef.h>
-
 #include "board.h"
+#include "../../regdef.h"
 
 extern uart_if_t uart_if[];
 
@@ -26,6 +26,8 @@ con_if_t con_if =
 	con_if_entry, ARRAYSIZE(con_if_entry)
 };
 
+void dbg_uart_setup();
+
 void board_init(void)
 {
 	uint32_t volatile *pITIM_ctrl = (uint32_t*)SYS_ITIM_CTRL;
@@ -33,18 +35,53 @@ void board_init(void)
 	// Disable timers
 	*pITIM_ctrl = 0;
 
-	// Initialzie syscall support
+	// Setup syscall support
 	syscalls_init();
 
-	// Initialzie interrupt support
-	interrupt_init();
+	// Setup Uart ISR 
+	dbg_uart_setup();
 
-	// Initalize debugger
+	// Setup debugger
 	dbg_init();
 
+	// Setup interrupt support
+	interrupt_init();
+
 	// Do some initializations here
 }
 
+extern void dbg_handler(struct xcptcontext * xcp);
+void dbg_uart_isr(struct xcptcontext *xcp);
+void dbg_uart_setup()
+{
+	uart_if_t *pUart = (uart_if_t*)con_getInstanceByName("UART-1");
+	
+	*pUart->pCTRL = SYS_UART_BIT_RX_INTEN;
+	interrupt_register(SYS_INT_UART1, dbg_uart_isr);
+	interrupt_enable(SYS_INT_UART1);
+}
+
+void dbg_uart_isr(struct xcptcontext *xcp)
+{
+	uart_if_t *pUart = (uart_if_t*)con_getInstanceByName("UART-1");
+
+	if(SYS_UART_BIT_RX_AVAIL & *pUart->pCTRL)
+	{
+		char c = *pUart->pDATA;
+		if (c == 3)
+		{
+			// Disable UART interrupt 
+			// to prevent consuming uart data in ISR during single step
+			// Interrupts mask bits are recovered on return from exception 
+			//interrupt_disable(SYS_INT_UART1);
+			//uint32_t im = 1 << SYS_INT_UART1;
+			//xcp->sr &= ~(SR_MASK_IM & (im << 8));
+			//*pUart->pCTRL &= ~SYS_UART_BIT_RX_INTEN;
+			dbg_handler(xcp);
+		}
+	}
+}
+	
 void dbg_putchar(char c)
 {
 	writechar(4, c);