Arm stack unwinder

Simplified stack unwinder for ARM. This is port of http://www.mcternan.me.uk/ArmStackUnwinding/ backtrace() is called from UIE() on native targets and from panicf() on both native and ARM RaaA. Change-Id: I8e4b3c02490dd60b30aa372fe842d193b8929ce0
2012-01-25 09:57:59 +01:00 · 2012-01-25 09:57:59 +01:00 · b4eab59951
commit b4eab59951
parent 680c6fcde1
23 changed files with 2630 additions and 18 deletions
--- a/lib/unwarminder/backtrace.c
+++ b/lib/unwarminder/backtrace.c
@ -0,0 +1,124 @@
+/***************************************************************************
+ * ARM Stack Unwinder, Michael.McTernan.2001@cs.bris.ac.uk
+ *
+ * This program is PUBLIC DOMAIN.
+ * This means that there is no copyright and anyone is able to take a copy
+ * for free and use it as they wish, with or without modifications, and in
+ * any context, commercially or otherwise. The only limitation is that I
+ * don't guarantee that the software is fit for any purpose or accept any
+ * liability for it's use or misuse - this software is without warranty.
+ ***************************************************************************
+ * File Description: Unwinder client that reads local memory.
+ *   This client reads from local memory and is designed to run on target
+ *   along with the unwinder.  Memory read requests are implemented by
+ *   casting a point to read the memory directly, although checks for
+ *   alignment should probably also be made if this is to be used in
+ *   production code, as otherwise the ARM may return the memory in a
+ *   rotated/rolled format, or the MMU may generate an alignment exception
+ *   if present and so configured.
+ **************************************************************************/
+
+/***************************************************************************
+ * Includes
+ ***************************************************************************/
+
+#include "backtrace.h"
+
+/***************************************************************************
+ * Prototypes
+ ***************************************************************************/
+
+static Boolean CliReport(void *data, Int32 address);
+static Boolean CliReadW(Int32 a, Int32 *v);
+static Boolean CliReadH(Int32 a, Int16 *v);
+static Boolean CliReadB(Int32 a, Int8  *v);
+
+/***************************************************************************
+ * Variables
+ ***************************************************************************/
+
+/* Table of function pointers for passing to the unwinder */
+const UnwindCallbacks cliCallbacks =
+    {
+        CliReport,
+        CliReadW,
+        CliReadH,
+        CliReadB
+#if defined(UNW_DEBUG)
+       ,printf
+#endif
+    };
+
+
+/***************************************************************************
+ * Callbacks
+ ***************************************************************************/
+
+/***************************************************************************
+ *
+ * Function:     CliReport
+ *
+ * Parameters:   data    - Pointer to data passed to UnwindStart()
+ *               address - The return address of a stack frame.
+ *
+ * Returns:      TRUE if unwinding should continue, otherwise FALSE to
+ *                 indicate that unwinding should stop.
+ *
+ * Description:  This function is called from the unwinder each time a stack
+ *                 frame has been unwound.  The LSB of address indicates if
+ *                 the processor is in ARM mode (LSB clear) or Thumb (LSB
+ *                 set).
+ *
+ ***************************************************************************/
+static Boolean CliReport(void *data, Int32 address)
+{
+    /* CliStack *s = (CliStack *)data; */
+    unsigned *line = (unsigned *)data;
+
+
+    lcd_putsf(0, (*line)++, "    %c: 0x%08x",
+              (address & 0x1) ? 'T' : 'A',
+              address & (~0x1));
+    lcd_update();
+
+    return TRUE;
+}
+
+static Boolean CliReadW(const Int32 a, Int32 *v)
+{
+    *v = *(Int32 *)a;
+    return TRUE;
+}
+
+static Boolean CliReadH(const Int32 a, Int16 *v)
+{
+    *v = *(Int16 *)a;
+    return TRUE;
+}
+
+static Boolean CliReadB(const Int32 a, Int8 *v)
+{
+    *v = *(Int8 *)a;
+    return TRUE;
+}
+
+Boolean CliInvalidateW(const Int32 a)
+{
+    *(Int32 *)a = 0xdeadbeef;
+    return TRUE;
+}
+
+void backtrace(int pcAddr, int spAddr, unsigned *line)
+{
+    UnwResult r;
+
+    lcd_putsf(0, (*line)++, "bt pc: 0x%08x, sp: 0x%08x", pcAddr, spAddr);
+    lcd_update();
+
+    r = UnwindStart(pcAddr, spAddr, &cliCallbacks, (void *)line);
+
+    lcd_puts(0, (*line)++, "bt end");
+    lcd_update();
+}
+
+/* END OF FILE */