Add a regset for POE containing POR_EL0.
Signed-off-by: Joey Gouly <joey.gouly@xxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
---
arch/arm64/kernel/ptrace.c | 46 ++++++++++++++++++++++++++++++++++++++
include/uapi/linux/elf.h | 1 +
2 files changed, 47 insertions(+)
diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c
index 20d7ef82de90..c3257a5c97f1 100644
--- a/arch/arm64/kernel/ptrace.c
+++ b/arch/arm64/kernel/ptrace.c
@@ -1409,6 +1409,39 @@ static int tagged_addr_ctrl_set(struct task_struct *target, const struct
}
#endif
+#ifdef CONFIG_ARM64_POE
+static int poe_get(struct task_struct *target,
+ const struct user_regset *regset,
+ struct membuf to)
+{
+ if (!system_supports_poe())
+ return -EINVAL;
+
+ return membuf_write(&to, &target->thread.por_el0,
+ sizeof(target->thread.por_el0));
+}
+
+static int poe_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;
+ long ctrl;
+
+ if (!system_supports_poe())
+ return -EINVAL;
+
+ ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &ctrl, 0, -1);
+ if (ret)
+ return ret;
+
+ target->thread.por_el0 = ctrl;
+
+ return 0;
+}
+#endif
+
enum aarch64_regset {
REGSET_GPR,
REGSET_FPR,
@@ -1437,6 +1470,9 @@ enum aarch64_regset {
#ifdef CONFIG_ARM64_TAGGED_ADDR_ABI
REGSET_TAGGED_ADDR_CTRL,
#endif
+#ifdef CONFIG_ARM64_POE
+ REGSET_POE
+#endif
};
static const struct user_regset aarch64_regsets[] = {
@@ -1587,6 +1623,16 @@ static const struct user_regset aarch64_regsets[] = {
.set = tagged_addr_ctrl_set,
},
#endif
+#ifdef CONFIG_ARM64_POE
+ [REGSET_POE] = {
+ .core_note_type = NT_ARM_POE,
+ .n = 1,
+ .size = sizeof(long),
+ .align = sizeof(long),
+ .regset_get = poe_get,
+ .set = poe_set,
+ },
+#endif
};
static const struct user_regset_view user_aarch64_view = {
diff --git a/include/uapi/linux/elf.h b/include/uapi/linux/elf.h
index 9417309b7230..f2713efcd81b 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_POE 0x40f /* ARM POE registers */
#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 */
--
2.25.1
