From: Will Deacon <will@kernel.org>
To: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org, Will Deacon <will@kernel.org>,
Arnd Bergmann <arnd@arndb.de>, Ard Biesheuvel <ardb@kernel.org>,
Ada Couprie Diaz <ada.coupriediaz@arm.com>,
David Hildenbrand <david@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Vladimir Murzin <vladimir.murzin@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Mostafa Saleh <smostafa@google.com>,
Lorenzo Stoakes <ljs@kernel.org>,
Oliver Upton <oupton@kernel.org>,
Linus Walleij <linusw@kernel.org>, Marc Zyngier <maz@kernel.org>
Subject: [PATCH 20/21] arm64: tracing: Advertise a mode of EL1t in synthetic kernel regs
Date: Mon, 7 Sep 2026 17:42:45 +0100 [thread overview]
Message-ID: <20260907164247.17223-21-will@kernel.org> (raw)
In-Reply-To: <20260907164247.17223-1-will@kernel.org>
When synthesising a kernel regs structure for ftrace or perf, advertise
a mode of EL1t to reflect the mode in which the kernel runs for the vast
majority of the time.
Signed-off-by: Will Deacon <will@kernel.org>
---
arch/arm64/include/asm/ftrace.h | 4 ++--
arch/arm64/include/asm/perf_event.h | 2 +-
2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/arm64/include/asm/ftrace.h b/arch/arm64/include/asm/ftrace.h
index 1621c84f44b3..d55a019cdf0a 100644
--- a/arch/arm64/include/asm/ftrace.h
+++ b/arch/arm64/include/asm/ftrace.h
@@ -153,7 +153,7 @@ ftrace_partial_regs(const struct ftrace_regs *fregs, struct pt_regs *regs)
regs->pc = afregs->pc;
regs->regs[29] = afregs->fp;
regs->regs[30] = afregs->lr;
- regs->pstate = PSR_MODE_EL1h;
+ regs->pstate = PSR_MODE_EL1t;
return regs;
}
@@ -161,7 +161,7 @@ ftrace_partial_regs(const struct ftrace_regs *fregs, struct pt_regs *regs)
(_regs)->pc = arch_ftrace_regs(fregs)->pc; \
(_regs)->regs[29] = arch_ftrace_regs(fregs)->fp; \
(_regs)->sp = arch_ftrace_regs(fregs)->sp; \
- (_regs)->pstate = PSR_MODE_EL1h; \
+ (_regs)->pstate = PSR_MODE_EL1t; \
} while (0)
int ftrace_regs_query_register_offset(const char *name);
diff --git a/arch/arm64/include/asm/perf_event.h b/arch/arm64/include/asm/perf_event.h
index ee45b4e77347..b3e7c24a5aab 100644
--- a/arch/arm64/include/asm/perf_event.h
+++ b/arch/arm64/include/asm/perf_event.h
@@ -17,7 +17,7 @@
(regs)->pc = (__ip); \
(regs)->regs[29] = (unsigned long) __builtin_frame_address(0); \
(regs)->sp = current_stack_pointer; \
- (regs)->pstate = PSR_MODE_EL1h; \
+ (regs)->pstate = PSR_MODE_EL1t; \
}
#endif
--
2.55.0.979.g7e5102b832-goog
next prev parent reply other threads:[~2026-09-07 16:44 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-07 16:42 [PATCH 00/21] arm64: Move overflow sp into SP_EL1 and kernel sp into SP_EL0 Will Deacon
2026-09-07 16:42 ` [PATCH 01/21] arm64: entry: Defer setting of TPIDRRO_EL0 until exit to userspace Will Deacon
2026-09-11 7:53 ` Jinjie Ruan
2026-09-07 16:42 ` [PATCH 02/21] arm64: entry: Only check for stack overflow on exceptions from EL1 Will Deacon
2026-09-07 16:42 ` [PATCH 03/21] arm64: stackprotector: Temporarily disable per-task stackprotector Will Deacon
2026-09-07 16:42 ` [PATCH 04/21] arm64: bpf: Add support for generating reads of TPIDRRO_EL0 Will Deacon
2026-09-07 16:42 ` [PATCH 05/21] KVM: arm64: Protect TPIDRRO_EL0 across guest entry/exit Will Deacon
2026-09-07 16:42 ` [PATCH 06/21] arm64: Store 'current' in TPIDRRO_EL0 instead of SP_EL0 Will Deacon
2026-09-08 13:19 ` David Laight
2026-09-11 12:57 ` Will Deacon
2026-09-07 16:42 ` [PATCH 07/21] selftests/bpf: arm64: Use TPIDRRO_EL0 instead of SP_EL0 for 'current' Will Deacon
2026-09-07 16:42 ` [PATCH 08/21] scripts/gdb: " Will Deacon
2026-09-07 16:42 ` [PATCH 09/21] arm64: stackprotector: Re-enable per-task stackprotector Will Deacon
2026-09-07 16:42 ` [PATCH 10/21] arm64: percpu: Specialise set_my_cpu_offset() for the primary CPU Will Deacon
2026-09-07 16:42 ` [PATCH 11/21] arm64: percpu: Annotate __kern_my_cpu_offset() as '__always_inline' Will Deacon
2026-09-07 16:42 ` [PATCH 12/21] KVM: arm64: Preserve handler/thread bit of EL1 mode in __finalise_el2() Will Deacon
2026-09-07 16:42 ` [PATCH 13/21] arm64: sdei: Guard most of asm/sdei.h with CONFIG_ARM_SDE_INTERFACE Will Deacon
2026-09-07 16:42 ` [PATCH 14/21] arm64: sdei: Support SDEI events from kernel handler and thread modes Will Deacon
2026-09-07 16:42 ` [PATCH 15/21] arm64: entry: Point SP_EL0 at the overflow stack Will Deacon
2026-09-07 16:42 ` [PATCH 16/21] arm64: entry: Implement EL1t exception handlers for " Will Deacon
2026-09-07 16:42 ` [PATCH 17/21] arm64: entry: Use SPSel to switch to " Will Deacon
2026-09-07 16:42 ` [PATCH 18/21] arm64: entry: Split up kernel_ventry macro into separate helper macros Will Deacon
2026-09-07 16:42 ` [PATCH 19/21] arm64: entry: The great stack switcheroo Will Deacon
2026-09-08 11:30 ` Will Deacon
2026-09-07 16:42 ` Will Deacon [this message]
2026-09-07 16:42 ` [PATCH 21/21] arm64: Rename 'overflow_stack' and OVERFLOW_STACK_SIZE Will Deacon
2026-09-09 10:39 ` [PATCH 00/21] arm64: Move overflow sp into SP_EL1 and kernel sp into SP_EL0 Vladimir Murzin
2026-09-09 11:29 ` Will Deacon
2026-09-10 13:49 ` Vladimir Murzin
2026-09-11 12:57 ` Will Deacon
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