[PATCH v4 21/29] arm64/ptrace: add support for FEAT_POE
From: Joey Gouly <joey.gouly@arm.com>
Date: 2024-05-03 13:03:05
Also in:
kvmarm, linux-arm-kernel, linux-fsdevel, linux-mm
Subsystem:
arm64 port (aarch64 architecture), exec & binfmt api, elf, ptrace support, the rest · Maintainers:
Catalin Marinas, Will Deacon, Kees Cook, Oleg Nesterov, Linus Torvalds
Add a regset for POE containing POR_EL0. Signed-off-by: Joey Gouly <joey.gouly@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will@kernel.org> Reviewed-by: Mark Brown <broonie@kernel.org> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> --- 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 0d022599eb61..b756578aeaee 100644
--- a/arch/arm64/kernel/ptrace.c
+++ b/arch/arm64/kernel/ptrace.c@@ -1440,6 +1440,39 @@ 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,
@@ -1469,6 +1502,9 @@ 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[] = {
@@ -1628,6 +1664,16 @@ 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 b54b313bcf07..81762ff3c99e 100644
--- a/include/uapi/linux/elf.h
+++ b/include/uapi/linux/elf.h@@ -441,6 +441,7 @@ typedef struct elf64_shdr { #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_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