From: Mark Brown <broonie@kernel.org>
To: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Marc Zyngier <maz@kernel.org>,
Oliver Upton <oliver.upton@linux.dev>,
James Morse <james.morse@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Jonathan Corbet <corbet@lwn.net>, Shuah Khan <shuah@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, Dave Martin <Dave.Martin@arm.com>,
kvmarm@lists.linux.dev, linux-doc@vger.kernel.org,
linux-kselftest@vger.kernel.org, Mark Brown <broonie@kernel.org>
Subject: [PATCH v5 5/9] arm64/ptrace: Expose FPMR via ptrace
Date: Wed, 06 Mar 2024 23:14:50 +0000 [thread overview]
Message-ID: <20240306-arm64-2023-dpisa-v5-5-c568edc8ed7f@kernel.org> (raw)
In-Reply-To: <20240306-arm64-2023-dpisa-v5-0-c568edc8ed7f@kernel.org>
Add a new regset to expose FPMR via ptrace. It is not added to the FPSIMD
registers since that structure is exposed elsewhere without any allowance
for extension we don't add there.
Signed-off-by: Mark Brown <broonie@kernel.org>
---
arch/arm64/kernel/ptrace.c | 42 ++++++++++++++++++++++++++++++++++++++++++
include/uapi/linux/elf.h | 1 +
2 files changed, 43 insertions(+)
diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c
index dc6cf0e37194..aacb45bd36e6 100644
--- a/arch/arm64/kernel/ptrace.c
+++ b/arch/arm64/kernel/ptrace.c
@@ -698,6 +698,39 @@ static int tls_set(struct task_struct *target, const struct user_regset *regset,
return ret;
}
+static int fpmr_get(struct task_struct *target, const struct user_regset *regset,
+ struct membuf to)
+{
+ if (!system_supports_fpmr())
+ return -EINVAL;
+
+ if (target == current)
+ fpsimd_preserve_current_state();
+
+ return membuf_store(&to, target->thread.uw.fpmr);
+}
+
+static int fpmr_set(struct task_struct *target, const struct user_regset *regset,
+ unsigned int pos, unsigned int count,
+ const void *kbuf, const void __user *ubuf)
+{
+ int ret;
+ unsigned long fpmr;
+
+ if (!system_supports_fpmr())
+ return -EINVAL;
+
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &fpmr, 0, count);
+ if (ret)
+ return ret;
+
+ target->thread.uw.fpmr = fpmr;
+
+ fpsimd_flush_task_state(target);
+
+ return 0;
+}
+
static int system_call_get(struct task_struct *target,
const struct user_regset *regset,
struct membuf to)
@@ -1419,6 +1452,7 @@ enum aarch64_regset {
REGSET_HW_BREAK,
REGSET_HW_WATCH,
#endif
+ REGSET_FPMR,
REGSET_SYSTEM_CALL,
#ifdef CONFIG_ARM64_SVE
REGSET_SVE,
@@ -1497,6 +1531,14 @@ static const struct user_regset aarch64_regsets[] = {
.regset_get = system_call_get,
.set = system_call_set,
},
+ [REGSET_FPMR] = {
+ .core_note_type = NT_ARM_FPMR,
+ .n = 1,
+ .size = sizeof(u64),
+ .align = sizeof(u64),
+ .regset_get = fpmr_get,
+ .set = fpmr_set,
+ },
#ifdef CONFIG_ARM64_SVE
[REGSET_SVE] = { /* Scalable Vector Extension */
.core_note_type = NT_ARM_SVE,
diff --git a/include/uapi/linux/elf.h b/include/uapi/linux/elf.h
index 9417309b7230..b54b313bcf07 100644
--- a/include/uapi/linux/elf.h
+++ b/include/uapi/linux/elf.h
@@ -440,6 +440,7 @@ typedef struct elf64_shdr {
#define NT_ARM_SSVE 0x40b /* ARM Streaming SVE registers */
#define NT_ARM_ZA 0x40c /* ARM SME ZA registers */
#define NT_ARM_ZT 0x40d /* ARM SME ZT registers */
+#define NT_ARM_FPMR 0x40e /* ARM floating point mode register */
#define NT_ARC_V2 0x600 /* ARCv2 accumulator/extra registers */
#define NT_VMCOREDD 0x700 /* Vmcore Device Dump Note */
#define NT_MIPS_DSP 0x800 /* MIPS DSP ASE registers */
--
2.30.2
next prev parent reply other threads:[~2024-03-06 23:15 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-06 23:14 [PATCH v5 0/9] arm64: Support for 2023 DPISA extensions Mark Brown
2024-03-06 23:14 ` [PATCH v5 1/9] arm64/cpufeature: Hook new identification registers up to cpufeature Mark Brown
2024-03-06 23:14 ` [PATCH v5 2/9] arm64/fpsimd: Enable host kernel access to FPMR Mark Brown
2024-03-06 23:14 ` [PATCH v5 3/9] arm64/fpsimd: Support FEAT_FPMR Mark Brown
2024-03-06 23:14 ` [PATCH v5 4/9] arm64/signal: Add FPMR signal handling Mark Brown
2024-03-06 23:14 ` Mark Brown [this message]
2024-03-06 23:14 ` [PATCH v5 6/9] arm64/hwcap: Define hwcaps for 2023 DPISA features Mark Brown
2024-03-06 23:14 ` [PATCH v5 7/9] kselftest/arm64: Handle FPMR context in generic signal frame parser Mark Brown
2024-03-06 23:14 ` [PATCH v5 8/9] kselftest/arm64: Add basic FPMR test Mark Brown
2024-03-06 23:14 ` [PATCH v5 9/9] kselftest/arm64: Add 2023 DPISA hwcap test coverage Mark Brown
2024-03-07 19:06 ` [PATCH v5 0/9] arm64: Support for 2023 DPISA extensions Catalin Marinas
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