mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

arm64/signal: Include TPIDR2 in the signal context 

Add a new signal frame record for TPIDR2 using the same format as we
already use for ESR with different magic, a header with the value from the
register appended as the only data. If SME is supported then this record is
always included.

Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
Link: https://lore.kernel.org/r/20221208-arm64-tpidr2-sig-v3-2-c77c6c8775f4@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Mark Brown 2022-12-27 14:20:41 +00:00 committed by Catalin Marinas
parent 17d0c4a27b
commit 39e5449928
2 changed files with 67 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
arch/arm64/include/uapi/asm/sigcontext.h
View File

@ -144,6 +144,14 @@ struct sve_context {
#define SVE_SIG_FLAG_SM 0x1 /* Context describes streaming mode */
/* TPIDR2_EL0 context */
#define TPIDR2_MAGIC 0x54504902
struct tpidr2_context {
struct _aarch64_ctx head;
__u64 tpidr2;
};
#define ZA_MAGIC 0x54366345
struct za_context {

59
arch/arm64/kernel/signal.c
View File

@ -56,6 +56,7 @@ struct rt_sigframe_user_layout {
unsigned long fpsimd_offset;
unsigned long esr_offset;
unsigned long sve_offset;
unsigned long tpidr2_offset;
unsigned long za_offset;
unsigned long extra_offset;
unsigned long end_offset;
@ -220,6 +221,7 @@ static int restore_fpsimd_context(struct fpsimd_context __user *ctx)
struct user_ctxs {
struct fpsimd_context __user *fpsimd;
struct sve_context __user *sve;
struct tpidr2_context __user *tpidr2;
struct za_context __user *za;
};
@ -361,6 +363,32 @@ extern int preserve_sve_context(void __user *ctx);
#ifdef CONFIG_ARM64_SME
static int preserve_tpidr2_context(struct tpidr2_context __user *ctx)
{
int err = 0;
current->thread.tpidr2_el0 = read_sysreg_s(SYS_TPIDR2_EL0);
__put_user_error(TPIDR2_MAGIC, &ctx->head.magic, err);
__put_user_error(sizeof(*ctx), &ctx->head.size, err);
__put_user_error(current->thread.tpidr2_el0, &ctx->tpidr2, err);
return err;
}
static int restore_tpidr2_context(struct user_ctxs *user)
{
u64 tpidr2_el0;
int err = 0;
/* Magic and size were validated deciding to call this function */
__get_user_error(tpidr2_el0, &user->tpidr2->tpidr2, err);
if (!err)
current->thread.tpidr2_el0 = tpidr2_el0;
return err;
}
static int preserve_za_context(struct za_context __user *ctx)
{
int err = 0;
@ -450,6 +478,8 @@ static int restore_za_context(struct user_ctxs *user)
#else /* ! CONFIG_ARM64_SME */
/* Turn any non-optimised out attempts to use these into a link error: */
extern int preserve_tpidr2_context(void __user *ctx);
extern int restore_tpidr2_context(struct user_ctxs *user);
extern int preserve_za_context(void __user *ctx);
extern int restore_za_context(struct user_ctxs *user);
@ -468,6 +498,7 @@ static int parse_user_sigframe(struct user_ctxs *user,
user->fpsimd = NULL;
user->sve = NULL;
user->tpidr2 = NULL;
user->za = NULL;
if (!IS_ALIGNED((unsigned long)base, 16))
@ -534,6 +565,19 @@ static int parse_user_sigframe(struct user_ctxs *user,
user->sve = (struct sve_context __user *)head;
break;
case TPIDR2_MAGIC:
if (!system_supports_sme())
goto invalid;
if (user->tpidr2)
goto invalid;
if (size != sizeof(*user->tpidr2))
goto invalid;
user->tpidr2 = (struct tpidr2_context __user *)head;
break;
case ZA_MAGIC:
if (!system_supports_sme())
goto invalid;
@ -666,6 +710,9 @@ static int restore_sigframe(struct pt_regs *regs,
err = restore_fpsimd_context(user.fpsimd);
}
if (err == 0 && system_supports_sme() && user.tpidr2)
err = restore_tpidr2_context(&user);
if (err == 0 && system_supports_sme() && user.za)
err = restore_za_context(&user);
@ -760,6 +807,11 @@ static int setup_sigframe_layout(struct rt_sigframe_user_layout *user,
else
vl = task_get_sme_vl(current);
err = sigframe_alloc(user, &user->tpidr2_offset,
sizeof(struct tpidr2_context));
if (err)
return err;
if (thread_za_enabled(&current->thread))
vq = sve_vq_from_vl(vl);
@ -817,6 +869,13 @@ static int setup_sigframe(struct rt_sigframe_user_layout *user,
err |= preserve_sve_context(sve_ctx);
}
/* TPIDR2 if supported */
if (system_supports_sme() && err == 0) {
struct tpidr2_context __user *tpidr2_ctx =
apply_user_offset(user, user->tpidr2_offset);
err |= preserve_tpidr2_context(tpidr2_ctx);
}
/* ZA state if present */
if (system_supports_sme() && err == 0 && user->za_offset) {
struct za_context __user *za_ctx =