Commit afe6f182 authored by Mark Brown's avatar Mark Brown Committed by Catalin Marinas
Browse files

kselftest/arm64: Teach the generic signal context validation about ZT 



Add ZT to the set of signal contexts that the shared code understands and
validates the form of.

Signed-off-by: default avatarMark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20221208-arm64-sme2-v4-17-f2fa0aef982f@kernel.org


Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 63829373

tools/testing/selftests/arm64/signal/testcases/testcases.c

+36 −0
Original line number Diff line number Diff line
@@ -108,6 +108,26 @@ bool validate_za_context(struct za_context *za, char **err) 
	return true;

}



bool validate_zt_context(struct zt_context *zt, char **err)

{

	if (!zt || !err)

		return false;



	/* If the context is present there should be at least one register */

	if (zt->nregs == 0) {

		*err = "no registers";

		return false;

	}



	/* Size should agree with the number of registers */

	if (zt->head.size != ZT_SIG_CONTEXT_SIZE(zt->nregs)) {

		*err = "register count does not match size";

		return false;

	}



	return true;

}



bool validate_reserved(ucontext_t *uc, size_t resv_sz, char **err)

{

	bool terminated = false;
@@ -117,6 +137,7 @@ bool validate_reserved(ucontext_t *uc, size_t resv_sz, char **err) 
	struct extra_context *extra = NULL;

	struct sve_context *sve = NULL;

	struct za_context *za = NULL;

	struct zt_context *zt = NULL;

	struct _aarch64_ctx *head =

		(struct _aarch64_ctx *)uc->uc_mcontext.__reserved;

	void *extra_data = NULL;
@@ -177,6 +198,13 @@ bool validate_reserved(ucontext_t *uc, size_t resv_sz, char **err) 
			za = (struct za_context *)head;

			new_flags |= ZA_CTX;

			break;

		case ZT_MAGIC:

			if (flags & ZT_CTX)

				*err = "Multiple ZT_MAGIC";

			/* Size is validated in validate_za_context() */

			zt = (struct zt_context *)head;

			new_flags |= ZT_CTX;

			break;

		case EXTRA_MAGIC:

			if (flags & EXTRA_CTX)

				*err = "Multiple EXTRA_MAGIC";
@@ -234,6 +262,9 @@ bool validate_reserved(ucontext_t *uc, size_t resv_sz, char **err) 
		if (new_flags & ZA_CTX)

			if (!validate_za_context(za, err))

				return false;

		if (new_flags & ZT_CTX)

			if (!validate_zt_context(zt, err))

				return false;



		flags |= new_flags;
@@ -245,6 +276,11 @@ bool validate_reserved(ucontext_t *uc, size_t resv_sz, char **err) 
		return false;

	}



	if (terminated && (flags & ZT_CTX) && !(flags & ZA_CTX)) {

		*err = "ZT context but no ZA context";

		return false;

	}



	return true;

}

tools/testing/selftests/arm64/signal/testcases/testcases.h

+1 −0
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ 
#define SVE_CTX		(1 << 1)

#define ZA_CTX		(1 << 2)

#define EXTRA_CTX	(1 << 3)

#define ZT_CTX		(1 << 4)



#define KSFT_BAD_MAGIC	0xdeadbeef