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| author | Marc Zyngier <marc.zyngier@arm.com> | 2018-09-27 17:15:31 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2018-10-01 13:35:59 +0100 |
| commit | 2a8905e18c55d5576d7a53da495b4de0cfcbc459 (patch) | |
| tree | aad1a389ef607b9f2790ff0103827e77e7866493 /arch | |
| parent | 1f1c014035a8084a768e7e902c6f5857995b1220 (diff) | |
| download | linux-2a8905e18c55d5576d7a53da495b4de0cfcbc459.tar.bz2 | |
arm64: compat: Add cp15_32 and cp15_64 handler arrays
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/kernel/traps.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c index 95a646c154fe..76ffb9f42aa4 100644 --- a/arch/arm64/kernel/traps.c +++ b/arch/arm64/kernel/traps.c @@ -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 |