2001-05-14 Till Straumann <strauman@slac.stanford.edu>

	* bootloader/misc.c, console/Makefile.am, console/console.c,
	console/consoleIo.h, console/inch.c, console/polled_io.c,
	console/uart.c, console/uart.h, include/bsp.h, irq/Makefile.am,
	irq/irq.c, irq/irq.h, irq/irq_init.c, openpic/openpic.c,
	openpic/openpic.h, pci/Makefile.am, pci/pci.c, pci/pci.h,
	residual/Makefile.am, start/start.S, startup/bspstart.c,
	vectors/vectors.S, vectors/vectors.h, vectors/vectors_init.c:
	Per PR216, "libbsp/powerpc/shared" BSP has been modified considerably
	with the goal to make it more flexible and reusable by other
	BSPs. The main strategies were:
	    - eliminate hardcoded base addresses; devices use offsets
	      and a BSP defined base address.
	    - separate functionality into different files (e.g. reboot from
	      inch.c to reboot.c) which can be overridden by a 'derived' BSP.
	    - separate initialization code into separate files (e.g.  PCI
	      bridge detection/initialization was separated from the more
	      generic PCI access routines), also to make it easier for
	      'derived' BSPs to substitute their own initialization code.
	There are also a couple of enhancements and fixes:
	    - IRQ handling code now has a hook for attaching a VME bridge.
	    - OpenPIC is now explicitely initialized (polarities, senses).
	      Eliminated the implicit assumption on the presence of an ISA PIC.
	    - UART and console driver now supports more than 1 port. The current
	      maximum of 2 can easily be extended by enlarging a table (it
	      would even be easier if the ISR API was not broken by design).
	    - fixed polled_io.c so it correctly supports console on COM2
	    - fixed TLB invalidation code (start.S).
	    - exception handler prints a stack backtrace.
	    - added BSP_pciFindDevice() to scan the pci bus for a particular
	      vendor/device/instance.

1 files changed, 36 insertions, 1 deletions

diff --git a/c/src/lib/libbsp/powerpc/shared/vectors/vectors_init.c b/c/src/lib/libbsp/powerpc/shared/vectors/vectors_init.c
index 9a339250e2..40b360e461 100644
--- a/c/src/lib/libbsp/powerpc/shared/vectors/vectors_init.c
+++ b/c/src/lib/libbsp/powerpc/shared/vectors/vectors_init.c
@@ -23,6 +23,38 @@ static rtems_raw_except_connect_data    exception_table[LAST_VALID_EXC + 1];
 
 exception_handler_t globalExceptHdl;
 
+/* T. Straumann: provide a stack trace
+ * <strauman@slac.stanford.edu>, 6/26/2001
+ */
+typedef struct LRFrameRec_ {
+	struct LRFrameRec_ *frameLink;
+	unsigned long *lr;
+} LRFrameRec, *LRFrame;
+
+#define STACK_CLAMP 50	/* in case we have a corrupted bottom */
+
+void
+BSP_printStackTrace(BSP_Exception_frame* excPtr)
+{
+LRFrame f;
+int	i;
+
+	printk("Stack Trace: ");
+	printk("  IP: 0x%08x, LR: 0x%08x\n",
+			excPtr->EXC_SRR0, excPtr->EXC_LR);
+	for (f=(LRFrame)excPtr->GPR1, i=0; f->frameLink && i<STACK_CLAMP; f=f->frameLink) {
+		printk("--^ 0x%08x", (long)(f->frameLink->lr));
+		if (!(++i%5))
+			printk("\n");
+	}
+	if (i>=STACK_CLAMP) {
+		printk("Too many stack frames (stack possibly corrupted), giving up...\n");
+	} else {
+		if (i%5)
+			printk("\n");
+	}
+}
+
 void C_exception_handler(BSP_Exception_frame* excPtr)
 {
   int recoverable = 0;
@@ -66,7 +98,10 @@ void C_exception_handler(BSP_Exception_frame* excPtr)
   printk("\t CTR = %x\n", excPtr->EXC_CTR);
   printk("\t XER = %x\n", excPtr->EXC_XER);
   printk("\t LR = %x\n", excPtr->EXC_LR);
-  printk("\t MSR = %x\n", excPtr->EXC_MSR);
+  printk("\t DAR = %x\n", excPtr->EXC_DAR);
+
+  BSP_printStackTrace(excPtr);
+
   if (excPtr->_EXC_number == ASM_DEC_VECTOR)
        recoverable = 1;
   if (excPtr->_EXC_number == ASM_SYS_VECTOR)