Commit ace19b18 authored by Mark Brown's avatar Mark Brown Committed by Catalin Marinas
Browse files

kselftest/arm64: signal: Support signal frames with SVE register data 



A signal frame with SVE may validly either be a bare struct sve_context or
a struct sve_context followed by vector length dependent register data.
Support either in the generic helpers for the signal tests, and while we're
at it validate the SVE vector length reported.

Signed-off-by: default avatarMark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20210819134245.13935-3-broonie@kernel.org


Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent d4e4dc4f

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

+31 −3
Original line number Diff line number Diff line
@@ -50,12 +50,38 @@ bool validate_extra_context(struct extra_context *extra, char **err) 
	return true;

}



bool validate_sve_context(struct sve_context *sve, char **err)

{

	/* Size will be rounded up to a multiple of 16 bytes */

	size_t regs_size

		= ((SVE_SIG_CONTEXT_SIZE(sve_vq_from_vl(sve->vl)) + 15) / 16) * 16;



	if (!sve || !err)

		return false;



	/* Either a bare sve_context or a sve_context followed by regs data */

	if ((sve->head.size != sizeof(struct sve_context)) &&

	    (sve->head.size != regs_size)) {

		*err = "bad size for SVE context";

		return false;

	}



	if (!sve_vl_valid(sve->vl)) {

		*err = "SVE VL invalid";



		return false;

	}



	return true;

}



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

{

	bool terminated = false;

	size_t offs = 0;

	int flags = 0;

	struct extra_context *extra = NULL;

	struct sve_context *sve = NULL;

	struct _aarch64_ctx *head =

		(struct _aarch64_ctx *)uc->uc_mcontext.__reserved;
@@ -90,9 +116,8 @@ bool validate_reserved(ucontext_t *uc, size_t resv_sz, char **err) 
		case SVE_MAGIC:

			if (flags & SVE_CTX)

				*err = "Multiple SVE_MAGIC";

			else if (head->size !=

				 sizeof(struct sve_context))

				*err = "Bad size for sve_context";

			/* Size is validated in validate_sve_context() */

			sve = (struct sve_context *)head;

			flags |= SVE_CTX;

			break;

		case EXTRA_MAGIC:
@@ -137,6 +162,9 @@ bool validate_reserved(ucontext_t *uc, size_t resv_sz, char **err) 
		if (flags & EXTRA_CTX)

			if (!validate_extra_context(extra, err))

				return false;

		if (flags & SVE_CTX)

			if (!validate_sve_context(sve, err))

				return false;



		head = GET_RESV_NEXT_HEAD(head);

	}