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arm64/ptrace: Expose FPMR via ptrace

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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>
Link: https://lore.kernel.org/r/20240306-arm64-2023-dpisa-v5-5-c568edc8ed7f@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Mark Brown 2024-03-06 23:14:50 +00:00 committed by Catalin Marinas
parent 8c46def444
commit 4035c22ef7
2 changed files with 43 additions and 0 deletions
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42
arch/arm64/kernel/ptrace.c
View file

@ -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,

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

@ -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 */