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authorMark Rutland <mark.rutland@arm.com>2017-02-09 15:19:19 +0000
committerWill Deacon <will.deacon@arm.com>2017-02-15 12:20:29 +0000
commit8b6e70fccff27121430114b4507f0adfb790752f (patch)
tree016d408b470e110bae2475374c829ecf0c0ffa89 /arch/arm64/kernel
parent6c23e2ff7013be2c4bbcb7b9b3cc27c763348223 (diff)
arm64: traps: correctly handle MRS/MSR with XZR
Currently we hand-roll XZR-safe register handling in user_cache_maint_handler(), though we forget to do the same in ctr_read_handler(), and may erroneously write back to the user SP rather than XZR. Use the new helpers to handle these cases correctly and consistently. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Fixes: 116c81f427ff6c53 ("arm64: Work around systems with mismatched cache line sizes") Cc: Andre Przywara <andre.przywara@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: Suzuki K Poulose <suzuki.poulose@arm.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/kernel')
-rw-r--r--arch/arm64/kernel/traps.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
index 7c3fc0634aa2..350179becdf7 100644
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@@ -466,7 +466,7 @@ static void user_cache_maint_handler(unsigned int esr, struct pt_regs *regs)
int crm = (esr & ESR_ELx_SYS64_ISS_CRM_MASK) >> ESR_ELx_SYS64_ISS_CRM_SHIFT;
int ret = 0;
- address = (rt == 31) ? 0 : regs->regs[rt];
+ address = pt_regs_read_reg(regs, rt);
switch (crm) {
case ESR_ELx_SYS64_ISS_CRM_DC_CVAU: /* DC CVAU, gets promoted */
@@ -495,8 +495,10 @@ static void user_cache_maint_handler(unsigned int esr, struct pt_regs *regs)
static void ctr_read_handler(unsigned int esr, struct pt_regs *regs)
{
int rt = (esr & ESR_ELx_SYS64_ISS_RT_MASK) >> ESR_ELx_SYS64_ISS_RT_SHIFT;
+ unsigned long val = arm64_ftr_reg_user_value(&arm64_ftr_reg_ctrel0);
+
+ pt_regs_write_reg(regs, rt, val);
- regs->regs[rt] = arm64_ftr_reg_user_value(&arm64_ftr_reg_ctrel0);
regs->pc += 4;
}