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arm64: compat: Add separate CP15 trapping hook

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Instead of directly generating an UNDEF when trapping a CP15 access,
let's add a new entry point to that effect (which only generates an
UNDEF for now).

Acked-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 17:15:29 +01:00 committed by Catalin Marinas
parent bd7ac140b8
commit 70c63cdfd6
2 changed files with 26 additions and 2 deletions
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15
arch/arm64/kernel/entry.S
View file

@ -697,9 +697,9 @@ el0_sync_compat:
cmp x24, #ESR_ELx_EC_UNKNOWN // unknown exception in EL0
b.eq el0_undef
cmp x24, #ESR_ELx_EC_CP15_32 // CP15 MRC/MCR trap
b.eq el0_undef
b.eq el0_cp15
cmp x24, #ESR_ELx_EC_CP15_64 // CP15 MRRC/MCRR trap
b.eq el0_undef
b.eq el0_cp15
cmp x24, #ESR_ELx_EC_CP14_MR // CP14 MRC/MCR trap
b.eq el0_undef
cmp x24, #ESR_ELx_EC_CP14_LS // CP14 LDC/STC trap
@ -722,6 +722,17 @@ el0_irq_compat:
el0_error_compat:
kernel_entry 0, 32
b el0_error_naked
el0_cp15:
/*
* Trapped CP15 (MRC, MCR, MRRC, MCRR) instructions
*/
enable_daif
ct_user_exit
mov x0, x25
mov x1, sp
bl do_cp15instr
b ret_to_user
#endif
el0_da:

13
arch/arm64/kernel/traps.c
View file

@ -547,6 +547,19 @@ static struct sys64_hook sys64_hooks[] = {
{},
};
#ifdef CONFIG_COMPAT
asmlinkage void __exception do_cp15instr(unsigned int esr, struct pt_regs *regs)
{
/*
* New cp15 instructions may previously have been undefined at
* EL0. Fall back to our usual undefined instruction handler
* so that we handle these consistently.
*/
do_undefinstr(regs);
}
#endif
asmlinkage void __exception do_sysinstr(unsigned int esr, struct pt_regs *regs)
{
struct sys64_hook *hook;