ldrp_V2 : Core context extraction if kernel executing at EL2

These changes add a new option --kernel-exception-level
which can be passed from command line to specify the
current exception level of kernel. This is to handle
a case where backtrace should get generated if kernel
is executing at EL2 instead of EL1.

Change-Id: If0d61119a6cc27e263d73ce9921a63cab4bdee45
Signed-off-by: Kumar Harsh <harkumar@codeaurora.org>

linux-ramdump-parser-v2/ramdump.py

@@ -543,6 +543,7 @@ class RamDump():
         self.autodump = options.autodump
         self.module_table = module_table.module_table_class()
         self.module_table.setup_sym_path(options.sym_path)
+        self.currentEL = options.currentEL or None
         if self.minidump:
             try:
                 mod = import_module('elftools.elf.elffile')

linux-ramdump-parser-v2/ramparse.py

@@ -120,6 +120,8 @@ if __name__ == '__main__':
     parser.add_option(
         '', '--force-version', type='int', dest='force_hardware_version',
         help='Force the hardware detection to a specific hardware version')
+    parser.add_option('-l', '--kernel-exception-level', type='int',
+                      dest='currentEL', help='Current exception level for kernel')
     parser.add_option('', '--parse-qdss', action='store_true',
                       dest='qdss', help='Parse QDSS (deprecated)')
     parser.add_option('', '--shell', action='store_true',

linux-ramdump-parser-v2/scandump_reader.py

-# Copyright (c) 2016-2017, The Linux Foundation. All rights reserved.
+# Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.
 
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2 and
@@ -243,7 +243,10 @@ class Scandump_v2():
         pc = self.regs['pc']
         if ram_dump.arm64:
             lr = self.regs['x30']
-            bt = self.regs['sp_el1']
+            if ram_dump.currentEL == 0x2:
+                bt = self.regs['sp_el2']
+            else:
+                bt = self.regs['sp_el1']
             fp = self.regs['x29']
         else:
             lr = self.regs['r14_svc']

linux-ramdump-parser-v2/watchdog_v2.py

-# Copyright (c) 2012-2017, The Linux Foundation. All rights reserved.
+# Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 2 and
@@ -724,7 +724,10 @@ class TZRegDump_v2():
         pc = self.core_regs.regs['pc']
         if ram_dump.arm64:
             lr = self.core_regs.regs['x30']
-            bt = self.core_regs.regs['sp_el1']
+            if ram_dump.currentEL == 0x2:
+                bt = self.core_regs.regs['sp_el2']
+            else:
+                bt = self.core_regs.regs['sp_el1']
             fp = self.core_regs.regs['x29']
         else:
             lr = self.core_regs.regs['r14_svc']