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powerpc: BookE hardware watchpoint support

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This patch implements support for HW based watchpoint via the
DBSR_DAC (Data Address Compare) facility of the BookE processors.

It does so by interfacing with the existing DABR breakpoint code
and adding the necessary bits and pieces for the new bits to
be properly set or cleared

Signed-off-by: Luis Machado <luisgpm@br.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Luis Machado
2008-07-24 02:10:41 +10:00
committed by Benjamin Herrenschmidt
parent 00bf6e9061
commit d6a61bfc06
7 changed files with 138 additions and 35 deletions
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2
include/asm-powerpc/system.h
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@@ -110,6 +110,8 @@ static inline int debugger_fault_handler(struct pt_regs *regs) { return 0; }
#endif
extern int set_dabr(unsigned long dabr);
extern void do_dabr(struct pt_regs *regs, unsigned long address,
unsigned long error_code);
extern void print_backtrace(unsigned long *);
extern void show_regs(struct pt_regs * regs);
extern void flush_instruction_cache(void);