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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/tools/testing/selftests/powerpc/tm/tm-signal-context-chk-gpr.c
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@@ -1,19 +1,15 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  * Copyright 2016, Cyril Bur, IBM Corp.
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- *
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- * This program is free software; you can redistribute it and/or
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- * modify it under the terms of the GNU General Public License
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- * as published by the Free Software Foundation; either version
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- * 2 of the License, or (at your option) any later version.
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- *
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  *
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  * Test the kernel's signal frame code.
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  *
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  * The kernel sets up two sets of ucontexts if the signal was to be
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- * delivered while the thread was in a transaction.
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+ * delivered while the thread was in a transaction (referred too as
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+ * first and second contexts).
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  * Expected behaviour is that the checkpointed state is in the user
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- * context passed to the signal handler. The speculated state can be
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- * accessed with the uc_link pointer.
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+ * context passed to the signal handler (first context). The speculated
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+ * state can be accessed with the uc_link pointer (second context).
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  *
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  * The rationale for this is that if TM unaware code (which linked
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  * against TM libs) installs a signal handler it will not know of the
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@@ -33,14 +29,22 @@
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29
 
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 #define MAX_ATTEMPT 500000
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-#define NV_GPR_REGS 18
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+#define NV_GPR_REGS 18 /* Number of non-volatile GPR registers */
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+#define R14 14 /* First non-volatile register to check in r14-r31 subset */
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 long tm_signal_self_context_load(pid_t pid, long *gprs, double *fps, vector int *vms, vector int *vss);
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-static sig_atomic_t fail;
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+static sig_atomic_t fail, broken;
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-static long gps[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
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-					 -1,-2,-3,-4,-5,-6,-7,-8,-9,-10,-11,-12,-13,-14,-15,-16,-17,-18};
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+/* Test only non-volatile general purpose registers, i.e. r14-r31 */
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+static long gprs[] = {
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+	/* First context will be set with these values, i.e. non-speculative */
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+	/* R14, R15, ... */
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+	 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
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+	/* Second context will be set with these values, i.e. speculative */
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+	/* R14, R15, ... */
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+	-1,-2,-3,-4,-5,-6,-7,-8,-9,-10,-11,-12,-13,-14,-15,-16,-17,-18
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+};
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 static void signal_usr1(int signum, siginfo_t *info, void *uc)
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 {
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@@ -48,12 +52,24 @@
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 	ucontext_t *ucp = uc;
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 	ucontext_t *tm_ucp = ucp->uc_link;
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-	for (i = 0; i < NV_GPR_REGS && !fail; i++) {
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-		fail = (ucp->uc_mcontext.gp_regs[i + 14] != gps[i]);
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-		fail |= (tm_ucp->uc_mcontext.gp_regs[i + 14] != gps[i + NV_GPR_REGS]);
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-		if (fail)
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-			printf("Failed on %d GPR %lu or %lu\n", i,
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-					ucp->uc_mcontext.gp_regs[i + 14], tm_ucp->uc_mcontext.gp_regs[i + 14]);
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+	/* Check first context. Print all mismatches. */
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+	for (i = 0; i < NV_GPR_REGS; i++) {
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+		fail = (ucp->uc_mcontext.gp_regs[R14 + i] != gprs[i]);
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+		if (fail) {
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+			broken = 1;
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+			printf("GPR%d (1st context) == %lu instead of %lu (expected)\n",
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+				R14 + i, ucp->uc_mcontext.gp_regs[R14 + i], gprs[i]);
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+		}
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+	}
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+
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+	/* Check second context. Print all mismatches. */
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+	for (i = 0; i < NV_GPR_REGS; i++) {
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+		fail = (tm_ucp->uc_mcontext.gp_regs[R14 + i] != gprs[NV_GPR_REGS + i]);
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+		if (fail) {
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+			broken = 1;
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+			printf("GPR%d (2nd context) == %lu instead of %lu (expected)\n",
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+				R14 + i, tm_ucp->uc_mcontext.gp_regs[R14 + i], gprs[NV_GPR_REGS + i]);
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+		}
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 	}
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 }
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@@ -75,13 +91,19 @@
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 	}
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 	i = 0;
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-	while (i < MAX_ATTEMPT && !fail) {
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-		rc = tm_signal_self_context_load(pid, gps, NULL, NULL, NULL);
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+	while (i < MAX_ATTEMPT && !broken) {
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+                /*
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+                 * tm_signal_self_context_load will set both first and second
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+                 * contexts accordingly to the values passed through non-NULL
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+                 * array pointers to it, in that case 'gprs', and invoke the
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+                 * signal handler installed for SIGUSR1.
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+                 */
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+		rc = tm_signal_self_context_load(pid, gprs, NULL, NULL, NULL);
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 		FAIL_IF(rc != pid);
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 		i++;
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 	}
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-	return fail;
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+	return broken;
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 }
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 int main(void)