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powerpc/booke: Add kprobes support for booke style processors

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This patch is based on work done by Madhvesh. R. Sulibhavi back in
March 2007.

We refactor some of the single step handling since it differs between
"classic" and "booke" powerpc cores.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Kumar Gala
2008-06-26 02:01:37 -05:00
parent b76e59d1fb
commit f82796214a
3 changed files with 37 additions and 15 deletions
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26
arch/powerpc/kernel/traps.c
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@@ -1030,21 +1030,29 @@ void SoftwareEmulation(struct pt_regs *regs)
#if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
void DebugException(struct pt_regs *regs, unsigned long debug_status)
void __kprobes DebugException(struct pt_regs *regs, unsigned long debug_status)
{
if (debug_status & DBSR_IC) { /* instruction completion */
regs->msr &= ~MSR_DE;
/* Disable instruction completion */
mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) & ~DBCR0_IC);
/* Clear the instruction completion event */
mtspr(SPRN_DBSR, DBSR_IC);
if (notify_die(DIE_SSTEP, "single_step", regs, 5,
5, SIGTRAP) == NOTIFY_STOP) {
return;
}
if (debugger_sstep(regs))
return;
if (user_mode(regs)) {
current->thread.dbcr0 &= ~DBCR0_IC;
} else {
/* Disable instruction completion */
mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) & ~DBCR0_IC);
/* Clear the instruction completion event */
mtspr(SPRN_DBSR, DBSR_IC);
if (debugger_sstep(regs))
return;
}
_exception(SIGTRAP, regs, TRAP_TRACE, 0);
_exception(SIGTRAP, regs, TRAP_TRACE, regs->nip);
}
}
#endif /* CONFIG_4xx || CONFIG_BOOKE */