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powerpc: Hardware breakpoints rewrite to handle non DABR breakpoint registers

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This is a rewrite so that we don't assume we are using the DABR throughout the
code.  We now use the arch_hw_breakpoint to store the breakpoint in a generic
manner in the thread_struct, rather than storing the raw DABR value.

The ptrace GET/SET_DEBUGREG interface currently passes the raw DABR in from
userspace.  We keep this functionality, so that future changes (like the POWER8
DAWR), will still fake the DABR to userspace.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Michael Neuling 2012-12-20 14:06:44 +00:00 • committed by Benjamin Herrenschmidt
parent a8190a59e7
commit 9422de3e95
14 changed files with 187 additions and 129 deletions
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4
arch/powerpc/mm/fault.c
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@ -249,8 +249,8 @@ int __kprobes do_page_fault(struct pt_regs *regs, unsigned long address,
#if !(defined(CONFIG_4xx) || defined(CONFIG_BOOKE) || \
defined(CONFIG_PPC_BOOK3S_64))
if (error_code & DSISR_DABRMATCH) {
/* DABR match */
do_dabr(regs, address, error_code);
/* breakpoint match */
do_break(regs, address, error_code);
return 0;
}
#endif