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The original intention of exception stack is no longer valid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
diff --git a/include/lib/aarch64/arch_helpers.h b/include/lib/aarch64/arch_helpers.h
index 67b452b..0a398d0 100644
--- a/include/lib/aarch64/arch_helpers.h
+++ b/include/lib/aarch64/arch_helpers.h
@@ -204,6 +204,8 @@
extern unsigned int read_cntfrq_el0(void);
extern unsigned long read_cnthctl_el2(void);
+extern unsigned long read_tpidr_el3(void);
+
extern void write_scr(unsigned long);
extern void write_hcr(unsigned long);
extern void write_cpacr(unsigned long);
@@ -264,10 +266,13 @@
extern void write_cptr_el2(unsigned long);
extern void write_cptr_el3(unsigned long);
+extern void write_tpidr_el3(unsigned long);
+
#define IS_IN_EL(x) \
(GET_EL(read_current_el()) == MODE_EL##x)
#define IS_IN_EL1() IS_IN_EL(1)
#define IS_IN_EL3() IS_IN_EL(3)
+
#endif /* __ARCH_HELPERS_H__ */