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kselftest/arm64: Print ASCII version of unknown signal frame magic values

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The signal magic values are supposed to be allocated as somewhat meaningful
ASCII so if we encounter a bad magic value print the any alphanumeric
characters we find in it as well as the hex value to aid debuggability.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20221102140543.98193-1-broonie@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Mark Brown 2022-11-02 14:05:43 +00:00 committed by Will Deacon
parent 2004734fb3
commit 9b283888a6
1 changed files with 17 additions and 4 deletions
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21
tools/testing/selftests/arm64/signal/testcases/testcases.c
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@ -1,5 +1,9 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2019 ARM Limited */
#include <ctype.h>
#include <string.h>
#include "testcases.h"
struct _aarch64_ctx *get_header(struct _aarch64_ctx *head, uint32_t magic,
@ -109,7 +113,7 @@ bool validate_reserved(ucontext_t *uc, size_t resv_sz, char **err)
bool terminated = false;
size_t offs = 0;
int flags = 0;
int new_flags;
int new_flags, i;
struct extra_context *extra = NULL;
struct sve_context *sve = NULL;
struct za_context *za = NULL;
@ -117,6 +121,7 @@ bool validate_reserved(ucontext_t *uc, size_t resv_sz, char **err)
(struct _aarch64_ctx *)uc->uc_mcontext.__reserved;
void *extra_data = NULL;
size_t extra_sz = 0;
char magic[4];
if (!err)
return false;
@ -194,11 +199,19 @@ bool validate_reserved(ucontext_t *uc, size_t resv_sz, char **err)
/*
* A still unknown Magic: potentially freshly added
* to the Kernel code and still unknown to the
* tests.
* tests. Magic numbers are supposed to be allocated
* as somewhat meaningful ASCII strings so try to
* print as such as well as the raw number.
*/
memcpy(magic, &head->magic, sizeof(magic));
for (i = 0; i < sizeof(magic); i++)
if (!isalnum(magic[i]))
magic[i] = '?';
fprintf(stdout,
"SKIP Unknown MAGIC: 0x%X - Is KSFT arm64/signal up to date ?\n",
head->magic);
"SKIP Unknown MAGIC: 0x%X (%c%c%c%c) - Is KSFT arm64/signal up to date ?\n",
head->magic,
magic[3], magic[2], magic[1], magic[0]);
break;
}