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arm64: compat: Add cp15_32 and cp15_64 handler arrays

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We're now ready to start handling CP15 access. Let's add (empty)
arrays for both 32 and 64bit accessors, and the code that deals
with them.

Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Marc Zyngier 2018-09-27 17:15:31 +01:00 committed by Catalin Marinas
parent 1f1c014035
commit 2a8905e18c
1 changed files with 28 additions and 0 deletions
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28
arch/arm64/kernel/traps.c
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@ -625,8 +625,18 @@ static void arm64_compat_skip_faulting_instruction(struct pt_regs *regs,
arm64_skip_faulting_instruction(regs, sz);
}
static struct sys64_hook cp15_32_hooks[] = {
{},
};
static struct sys64_hook cp15_64_hooks[] = {
{},
};
asmlinkage void __exception do_cp15instr(unsigned int esr, struct pt_regs *regs)
{
struct sys64_hook *hook, *hook_base;
if (!cp15_cond_valid(esr, regs)) {
/*
* There is no T16 variant of a CP access, so we
@ -636,6 +646,24 @@ asmlinkage void __exception do_cp15instr(unsigned int esr, struct pt_regs *regs)
return;
}
switch (ESR_ELx_EC(esr)) {
case ESR_ELx_EC_CP15_32:
hook_base = cp15_32_hooks;
break;
case ESR_ELx_EC_CP15_64:
hook_base = cp15_64_hooks;
break;
default:
do_undefinstr(regs);
return;
}
for (hook = hook_base; hook->handler; hook++)
if ((hook->esr_mask & esr) == hook->esr_val) {
hook->handler(esr, regs);
return;
}
/*
* New cp15 instructions may previously have been undefined at
* EL0. Fall back to our usual undefined instruction handler