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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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8
arch/powerpc/kernel/ptrace32.c
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@@ -252,6 +252,9 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
}
case PTRACE_GET_DEBUGREG: {
#ifndef CONFIG_PPC_ADV_DEBUG_REGS
unsigned long dabr_fake;
#endif
ret = -EINVAL;
/* We only support one DABR and no IABRS at the moment */
if (addr > 0)
@@ -259,7 +262,10 @@ long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
#ifdef CONFIG_PPC_ADV_DEBUG_REGS
ret = put_user(child->thread.dac1, (u32 __user *)data);
#else
ret = put_user(child->thread.dabr, (u32 __user *)data);
dabr_fake = (
(child->thread.hw_brk.address & (~HW_BRK_TYPE_DABR)) |
(child->thread.hw_brk.type & HW_BRK_TYPE_DABR));
ret = put_user(dabr_fake, (u32 __user *)data);
#endif
break;
}