Commit 17519819 authored by Joey Gouly's avatar Joey Gouly Committed by Will Deacon
Browse files

arm64/ptrace: add support for FEAT_POE 



Add a regset for POE containing POR_EL0.

Signed-off-by: default avatarJoey Gouly <joey.gouly@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Reviewed-by: default avatarMark Brown <broonie@kernel.org>
Reviewed-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Reviewed-by: default avatarAnshuman Khandual <anshuman.khandual@arm.com>
Link: https://lore.kernel.org/r/20240822151113.1479789-21-joey.gouly@arm.com


Signed-off-by: default avatarWill Deacon <will@kernel.org>
parent 9160f7e9

arch/arm64/kernel/ptrace.c

+46 −0
Original line number Diff line number Diff line
@@ -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 = {

include/uapi/linux/elf.h

+1 −0
Original line number Diff line number Diff line
@@ -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 */