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arm64/ptrace: add support for FEAT_POE

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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>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Link: https://lore.kernel.org/r/20240822151113.1479789-21-joey.gouly@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Joey Gouly 2024-08-22 16:11:03 +01:00 committed by Will Deacon
parent 9160f7e909
commit 1751981992
2 changed files with 47 additions and 0 deletions
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46
arch/arm64/kernel/ptrace.c
View File

@ -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 = {

1
include/uapi/linux/elf.h
View File

@ -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 */