[PATCH v2 00/12] arm64: ARMv8.5-A: Branch Target Identification support · Dave Martin <Dave.Martin@arm.com> · 2019-10-10
[PATCH v2 01/12] ELF: UAPI and Kconfig additions for ELF program properties · Dave Martin <Dave.Martin@arm.com> · 2019-10-10
[PATCH v2 02/12] ELF: Add ELF program property parsing support · Dave Martin <Dave.Martin@arm.com> · 2019-10-10
[PATCH v2 03/12] mm: Reserve asm-generic prot flag 0x10 for arch use · Dave Martin <Dave.Martin@arm.com> · 2019-10-10
[PATCH v2 04/12] arm64: docs: cpu-feature-registers: Document ID_AA64PFR1_EL1 · Dave Martin <Dave.Martin@arm.com> · 2019-10-10
Re: [PATCH v2 04/12] arm64: docs: cpu-feature-registers: Document ID_AA64PFR1_EL1 · Alex Bennée <hidden> · 2019-10-11
Re: [PATCH v2 04/12] arm64: docs: cpu-feature-registers: Document ID_AA64PFR1_EL1 · Dave Martin <Dave.Martin@arm.com> · 2019-10-11
Re: [PATCH v2 04/12] arm64: docs: cpu-feature-registers: Document ID_AA64PFR1_EL1 · Mark Brown <broonie@kernel.org> · 2019-10-21
Re: [PATCH v2 04/12] arm64: docs: cpu-feature-registers: Document ID_AA64PFR1_EL1 · Will Deacon <will@kernel.org> · 2019-10-22
[PATCH v2 05/12] arm64: Basic Branch Target Identification support · Dave Martin <Dave.Martin@arm.com> · 2019-10-10
[FIXUP 0/2] Fixups to patch 5 · Dave Martin <Dave.Martin@arm.com> · 2019-10-11
[FIXUP 1/2] squash! arm64: Basic Branch Target Identification support · Dave Martin <Dave.Martin@arm.com> · 2019-10-11
[FIXUP 2/2] squash! arm64: Basic Branch Target Identification support · Dave Martin <Dave.Martin@arm.com> · 2019-10-11
Re: [PATCH v2 05/12] arm64: Basic Branch Target Identification support · Mark Rutland <mark.rutland@arm.com> · 2019-10-11
Re: [PATCH v2 05/12] arm64: Basic Branch Target Identification support · Richard Henderson <richard.henderson@linaro.org> · 2019-10-11
Re: [PATCH v2 05/12] arm64: Basic Branch Target Identification support · Dave Martin <Dave.Martin@arm.com> · 2019-10-11
Re: [PATCH v2 05/12] arm64: Basic Branch Target Identification support · Mark Rutland <mark.rutland@arm.com> · 2019-10-11
Re: [PATCH v2 05/12] arm64: Basic Branch Target Identification support · Dave Martin <Dave.Martin@arm.com> · 2019-10-11
Re: [PATCH v2 05/12] arm64: Basic Branch Target Identification support · Dave Martin <Dave.Martin@arm.com> · 2019-10-11
Re: [PATCH v2 05/12] arm64: Basic Branch Target Identification support · Dave Martin <Dave.Martin@arm.com> · 2019-10-11
Re: [PATCH v2 05/12] arm64: Basic Branch Target Identification support · Mark Rutland <mark.rutland@arm.com> · 2019-10-18
Re: [PATCH v2 05/12] arm64: Basic Branch Target Identification support · Dave Martin <Dave.Martin@arm.com> · 2019-10-18
Re: [PATCH v2 05/12] arm64: Basic Branch Target Identification support · Dave Martin <Dave.Martin@arm.com> · 2019-10-11
Re: [PATCH v2 05/12] arm64: Basic Branch Target Identification support · Mark Rutland <mark.rutland@arm.com> · 2019-10-18
Re: [PATCH v2 05/12] arm64: Basic Branch Target Identification support · Dave Martin <Dave.Martin@arm.com> · 2019-10-18
Re: [PATCH v2 05/12] arm64: Basic Branch Target Identification support · Mark Rutland <mark.rutland@arm.com> · 2019-10-18
Re: [PATCH v2 05/12] arm64: Basic Branch Target Identification support · Dave Martin <Dave.Martin@arm.com> · 2019-10-18
[PATCH v2 06/12] elf: Allow arch to tweak initial mmap prot flags · Dave Martin <Dave.Martin@arm.com> · 2019-10-10
[PATCH v2 07/12] arm64: elf: Enable BTI at exec based on ELF program properties · Dave Martin <Dave.Martin@arm.com> · 2019-10-10
[PATCH v2 08/12] arm64: BTI: Decode BYTPE bits when printing PSTATE · Dave Martin <Dave.Martin@arm.com> · 2019-10-10
Re: [PATCH v2 08/12] arm64: BTI: Decode BYTPE bits when printing PSTATE · Richard Henderson <richard.henderson@linaro.org> · 2019-10-11
Re: [PATCH v2 08/12] arm64: BTI: Decode BYTPE bits when printing PSTATE · Dave Martin <Dave.Martin@arm.com> · 2019-10-11
[PATCH v2 09/12] arm64: traps: Fix inconsistent faulting instruction skipping · Dave Martin <Dave.Martin@arm.com> · 2019-10-10
Re: [PATCH v2 09/12] arm64: traps: Fix inconsistent faulting instruction skipping · Mark Rutland <mark.rutland@arm.com> · 2019-10-11
Re: [PATCH v2 09/12] arm64: traps: Fix inconsistent faulting instruction skipping · Dave Martin <Dave.Martin@arm.com> · 2019-10-15
Re: [PATCH v2 09/12] arm64: traps: Fix inconsistent faulting instruction skipping · Mark Rutland <mark.rutland@arm.com> · 2019-10-15
Re: [PATCH v2 09/12] arm64: traps: Fix inconsistent faulting instruction skipping · Dave Martin <Dave.Martin@arm.com> · 2019-10-15
Re: [PATCH v2 09/12] arm64: traps: Fix inconsistent faulting instruction skipping · Dave Martin <Dave.Martin@arm.com> · 2019-10-18
Re: [PATCH v2 09/12] arm64: traps: Fix inconsistent faulting instruction skipping · Robin Murphy <robin.murphy@arm.com> · 2019-10-22
[PATCH v2 10/12] arm64: traps: Shuffle code to eliminate forward declarations · Dave Martin <Dave.Martin@arm.com> · 2019-10-10
[PATCH v2 11/12] arm64: BTI: Reset BTYPE when skipping emulated instructions · Dave Martin <Dave.Martin@arm.com> · 2019-10-10
Re: [PATCH v2 11/12] arm64: BTI: Reset BTYPE when skipping emulated instructions · Mark Rutland <mark.rutland@arm.com> · 2019-10-11
Re: [PATCH v2 11/12] arm64: BTI: Reset BTYPE when skipping emulated instructions · Dave Martin <Dave.Martin@arm.com> · 2019-10-11
Re: [PATCH v2 11/12] arm64: BTI: Reset BTYPE when skipping emulated instructions · Mark Rutland <mark.rutland@arm.com> · 2019-10-18
Re: [PATCH v2 11/12] arm64: BTI: Reset BTYPE when skipping emulated instructions · Dave Martin <Dave.Martin@arm.com> · 2019-10-18
[PATCH v2 12/12] KVM: arm64: BTI: Reset BTYPE when skipping emulated instructions · Dave Martin <Dave.Martin@arm.com> · 2019-10-10
Re: [PATCH v2 12/12] KVM: arm64: BTI: Reset BTYPE when skipping emulated instructions · Mark Rutland <mark.rutland@arm.com> · 2019-10-11
Re: [PATCH v2 12/12] KVM: arm64: BTI: Reset BTYPE when skipping emulated instructions · Dave Martin <Dave.Martin@arm.com> · 2019-10-11

STALE2468d

Revisions (2)

2019-10-10 v2 current
2019-10-18 v3 [diff vs current]

[PATCH v2 11/12] arm64: BTI: Reset BTYPE when skipping emulated instructions

From: Dave Martin <Dave.Martin@arm.com>
Date: 2019-10-10 18:46:06
Also in: linux-arch, lkml
Subsystem: arm64 port (aarch64 architecture), the rest · Maintainers: Catalin Marinas, Will Deacon, Linus Torvalds

Since normal execution of any non-branch instruction resets the
PSTATE BTYPE field to 0, so do the same thing when emulating a
trapped instruction.

Branches don't trap directly, so we should never need to assign a
non-zero value to BTYPE here.

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
---
 arch/arm64/kernel/traps.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
index 3af2768..4d8ce50 100644
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c

@@ -331,6 +331,8 @@ void arm64_skip_faulting_instruction(struct pt_regs *regs, unsigned long size)
 
 	if (regs->pstate & PSR_MODE32_BIT)
 		advance_itstate(regs);
+	else
+		regs->pstate &= ~(u64)PSR_BTYPE_MASK;
 }
 
 static LIST_HEAD(undef_hook);

-- 
2.1.4


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