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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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25
arch/powerpc/mm/fault.c
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@ -100,31 +100,6 @@ static int store_updates_sp(struct pt_regs *regs)
return 0;
}
#if !(defined(CONFIG_4xx) || defined(CONFIG_BOOKE))
static void do_dabr(struct pt_regs *regs, unsigned long address,
unsigned long error_code)
{
siginfo_t info;
if (notify_die(DIE_DABR_MATCH, "dabr_match", regs, error_code,
11, SIGSEGV) == NOTIFY_STOP)
return;
if (debugger_dabr_match(regs))
return;
/* Clear the DABR */
set_dabr(0);
/* Deliver the signal to userspace */
info.si_signo = SIGTRAP;
info.si_errno = 0;
info.si_code = TRAP_HWBKPT;
info.si_addr = (void __user *)address;
force_sig_info(SIGTRAP, &info, current);
}
#endif /* !(CONFIG_4xx || CONFIG_BOOKE)*/
/*
* For 600- and 800-family processors, the error_code parameter is DSISR
* for a data fault, SRR1 for an instruction fault. For 400-family processors