From 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sat, 27 Apr 2024 12:05:51 +0200
Subject: Adding upstream version 5.10.209.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 tools/testing/selftests/powerpc/mm/segv_errors.c | 78 ++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 tools/testing/selftests/powerpc/mm/segv_errors.c

(limited to 'tools/testing/selftests/powerpc/mm/segv_errors.c')

diff --git a/tools/testing/selftests/powerpc/mm/segv_errors.c b/tools/testing/selftests/powerpc/mm/segv_errors.c
new file mode 100644
index 000000000..06ae76ee3
--- /dev/null
+++ b/tools/testing/selftests/powerpc/mm/segv_errors.c
@@ -0,0 +1,78 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * Copyright 2017 John Sperbeck
+ *
+ * Test that an access to a mapped but inaccessible area causes a SEGV and
+ * reports si_code == SEGV_ACCERR.
+ */
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <signal.h>
+#include <sys/mman.h>
+#include <assert.h>
+#include <ucontext.h>
+
+#include "utils.h"
+
+static bool faulted;
+static int si_code;
+
+static void segv_handler(int n, siginfo_t *info, void *ctxt_v)
+{
+	ucontext_t *ctxt = (ucontext_t *)ctxt_v;
+	struct pt_regs *regs = ctxt->uc_mcontext.regs;
+
+	faulted = true;
+	si_code = info->si_code;
+	regs->nip += 4;
+}
+
+int test_segv_errors(void)
+{
+	struct sigaction act = {
+		.sa_sigaction = segv_handler,
+		.sa_flags = SA_SIGINFO,
+	};
+	char c, *p = NULL;
+
+	p = mmap(NULL, getpagesize(), 0, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
+	FAIL_IF(p == MAP_FAILED);
+
+	FAIL_IF(sigaction(SIGSEGV, &act, NULL) != 0);
+
+	faulted = false;
+	si_code = 0;
+
+	/*
+	 * We just need a compiler barrier, but mb() works and has the nice
+	 * property of being easy to spot in the disassembly.
+	 */
+	mb();
+	c = *p;
+	mb();
+
+	FAIL_IF(!faulted);
+	FAIL_IF(si_code != SEGV_ACCERR);
+
+	faulted = false;
+	si_code = 0;
+
+	mb();
+	*p = c;
+	mb();
+
+	FAIL_IF(!faulted);
+	FAIL_IF(si_code != SEGV_ACCERR);
+
+	return 0;
+}
+
+int main(void)
+{
+	return test_harness(test_segv_errors, "segv_errors");
+}
-- 
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