path: root/lib/aarch64/sysreg_helpers.S
diff options
authorSoby Mathew <soby.mathew@arm.com>2014-04-07 15:28:55 +0100
committerSoby Mathew <soby.mathew@arm.com>2014-05-16 14:51:00 +0100
commita43d431b80541ea436b71f967c5749babf978c7a (patch)
tree15bbb0525b219f28bd9907bc77b9fd8391723caa /lib/aarch64/sysreg_helpers.S
parentc5c9b69c132c823aabc1e29c2ff6f30323c85483 (diff)
Rework BL3-1 unhandled exception handling and reporting
This patch implements the register reporting when unhandled exceptions are taken in BL3-1. Unhandled exceptions will result in a dump of registers to the console, before halting execution by that CPU. The Crash Stack, previously called the Exception Stack, is used for this activity. This stack is used to preserve the CPU context and runtime stack contents for debugging and analysis. This also introduces the per_cpu_ptr_cache, referenced by tpidr_el3, to provide easy access to some of BL3-1 per-cpu data structures. Initially, this is used to provide a pointer to the Crash stack. panic() now prints the the error file and line number in Debug mode and prints the PC value in release mode. The Exception Stack is renamed to Crash Stack with this patch. The original intention of exception stack is no longer valid since we intend to support several valid exceptions like IRQ and FIQ in the trusted firmware context. This stack is now utilized for dumping and reporting the system state when a crash happens and hence the rename. Fixes ARM-software/tf-issues#79 Improve reporting of unhandled exception Change-Id: I260791dc05536b78547412d147193cdccae7811a
Diffstat (limited to 'lib/aarch64/sysreg_helpers.S')
1 files changed, 10 insertions, 0 deletions
diff --git a/lib/aarch64/sysreg_helpers.S b/lib/aarch64/sysreg_helpers.S
index 376da49..c86fdba 100644
--- a/lib/aarch64/sysreg_helpers.S
+++ b/lib/aarch64/sysreg_helpers.S
@@ -155,6 +155,9 @@
.globl read_id_pfr1_el1
.globl read_id_aa64pfr0_el1
+ .globl write_tpidr_el3
+ .globl read_tpidr_el3
.globl enable_vfp
@@ -719,6 +722,13 @@ func read_mpidr
mrs x0, mpidr_el1
+func write_tpidr_el3
+ msr tpidr_el3, x0
+ ret
+func read_tpidr_el3
+ mrs x0, tpidr_el3
+ ret
func enable_vfp