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Rework BL3-1 unhandled exception handling and reporting

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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The original intention of exception stack is no longer valid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
This commit is contained in:
Soby Mathew 2014-04-07 15:28:55 +01:00
parent c5c9b69c13
commit a43d431b80
23 changed files with 578 additions and 170 deletions
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17
include/common/debug.h
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@ -56,11 +56,16 @@
/* For the moment this Panic function is very basic, Report an error and
* spin. This can be expanded in the future to provide more information.
*/
static inline void __attribute__((noreturn)) panic(void)
{
ERROR("PANIC\n");
while (1)
;
}
#if DEBUG
extern void __dead2 do_panic(const char *file, int line);
#define panic() do_panic(__FILE__, __LINE__)
#else
extern void __dead2 do_panic(void);
#define panic() do_panic()
#endif
extern void print_string_value(char *s, unsigned long *mem);
#endif /* __DEBUG_H__ */